:root {
    /* Fonts */
    --font-body: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Noto Sans Display', 'Noto Sans JP', sans-serif;

    /* Core palette */
    --background-color: #f0f2f5;
    --surface-color: #ffffff;
    --on-surface-color: #1c1c1e;
    --on-surface-variant-color: #6d6d70;
    --primary-color: #3535D9;
    --primary-text-color: #ffffff;
    --error-color: #ff3b30;

    /* Summary card colors */
    --summary-sogo-bg: #ed6c59;
    --summary-senmon-bg: #5f8ef7;
    --summary-jiyu-bg: #64d2ab;
    --summary-sotsugyo-bg: #ffcc00;
    --summary-mitoku-bg: #ffffff;
    --summary-gpa-bg: #5ac8fa;
    --summary-card-dark-text: #ffffff;
    --summary-card-light-text: #ffffff;
    --summary-card-border: #e5e5ea;

    /* Category colors */
    --color-hissu: #ed6c59;
    --color-sentaku: #ee805b;
    --color-sengai: #f2aa60;
    --color-nyumon: #5f8ef7;
    --color-kiso: #5567f6;
    --color-tenkai: #6f52f7;
    --color-senmon: #9c55f6;
    --color-enshu: #ca59f7;
    --color-sonota: #64d2ab;
    --color-event: #8e8e93;

    /* GPA colors */
    --gpa-s: #8cbbe5;
    --gpa-ap: #acd089;
    --gpa-a: #acd089;
    --gpa-am: #acd089;
    --gpa-bp: #e9e799;
    --gpa-b: #e9e799;
    --gpa-bm: #e9e799;
    --gpa-cp: #e3c489;
    --gpa-c: #e3c489;
    --gpa-cm: #e3c489;
    --gpa-d: #dd917e;
    --gpa-e: #dd917e;

    /* Spacing, radii, motion (preserved) */
    --space-3xs: 2px;
    --space-2xs: 4px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --radius-xs: 8px;
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-pill: 999px;
    --motion-duration-short: 140ms;
    --motion-duration-medium: 260ms;
    --motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);

    /* Effects */
    --shadow-level-1: 0 1px 2px rgba(0, 0, 0, 0.14), 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-level-2: 0 4px 12px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.08);

    /* UI states */
    --color-hover: #f0f2f5;
    --color-focus-ring: #3535D933;
    --nav-background: rgba(249, 249, 249, 0.94);
    --nav-border: #d1d1d6;
    color-scheme: light;

    /* Back-compat aliases (map old tokens to new) */
    --font-family-sans: var(--font-body);
    --color-surface: var(--background-color);
    --color-surface-container: var(--surface-color);
    --color-surface-container-high: var(--surface-color);
    --color-surface-container-higher: var(--surface-color);
    --color-on-surface: var(--on-surface-color);
    --color-on-surface-variant: var(--on-surface-variant-color);
    --color-primary: var(--primary-color);
    --color-on-primary: var(--primary-text-color);
    --color-danger: var(--error-color);
    --color-primary-container: var(--surface-color);
    --color-on-primary-container: var(--on-surface-color);
    --color-surface-variant: var(--summary-card-border);
    --color-outline: var(--summary-card-border);
    --color-outline-variant: var(--summary-card-border);
    --accent-deadline: var(--color-hissu);
    --accent-plan: var(--summary-sotsugyo-bg);
    --accent-memo: var(--color-sonota);

    --tag-dot-size: 12px;
    --z-modal: 1000;
    --z-toast: 1100;
}

:root[data-theme="dark"] {
    --background-color: #161618;
    --surface-color: #232326;
    --on-surface-color: #f5f5f7;
    --on-surface-variant-color: #a3a3a4;
    --primary-color: #339dff;
    --primary-text-color: #ffffff;
    --error-color: #ff453a;

    --summary-sogo-bg: #ed6c59;
    --summary-senmon-bg: #5f8ef7;
    --summary-jiyu-bg: #64d2ab;
    --summary-sotsugyo-bg: #ffcc00;
    --summary-mitoku-bg: #232326;
    --summary-gpa-bg: #5ac8fa;
    --summary-card-dark-text: #ffffff;
    --summary-card-light-text: #ffffff;
    --summary-card-border: #3a3a3c;

    --color-hissu: #ed6c59;
    --color-sentaku: #ee805b;
    --color-sengai: #f2aa60;
    --color-nyumon: #5f8ef7;
    --color-kiso: #5567f6;
    --color-tenkai: #6f52f7;
    --color-senmon: #9c55f6;
    --color-enshu: #ca59f7;
    --color-sonota: #64d2ab;
    --color-event: #8e8e93;

    --gpa-s: #8cbbe5;
    --gpa-ap: #acd089;
    --gpa-a: #acd089;
    --gpa-am: #acd089;
    --gpa-bp: #e9e799;
    --gpa-b: #e9e799;
    --gpa-bm: #e9e799;
    --gpa-cp: #e3c489;
    --gpa-c: #e3c489;
    --gpa-cm: #e3c489;
    --gpa-d: #dd917e;
    --gpa-e: #dd917e;

    --color-hover: #232326;
    --color-focus-ring: #339dff33;
    --nav-background: rgba(35, 35, 38, 0.92);
    --nav-border: #3a3a3c;
    color-scheme: dark;

    /* Back-compat aliases */
    --color-surface: var(--background-color);
    --color-surface-container: var(--surface-color);
    --color-surface-container-high: var(--surface-color);
    --color-surface-container-higher: var(--surface-color);
    --color-on-surface: var(--on-surface-color);
    --color-on-surface-variant: var(--on-surface-variant-color);
    --color-primary: var(--primary-color);
    --color-on-primary: var(--primary-text-color);
    --color-danger: var(--error-color);
    --color-primary-container: var(--surface-color);
    --color-on-primary-container: var(--on-surface-color);
    --color-surface-variant: var(--summary-card-border);
    --color-outline: var(--summary-card-border);
    --color-outline-variant: var(--summary-card-border);
    --accent-deadline: var(--color-hissu);
    --accent-plan: var(--summary-sotsugyo-bg);
    --accent-memo: var(--color-sonota);

    --shadow-level-1: 0 1px 3px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-level-2: 0 6px 16px rgba(0, 0, 0, 0.45), 0 3px 8px rgba(0, 0, 0, 0.4);
}

*, *::before, *::after { box-sizing: border-box; }

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

body {
    margin: 0;
    background-color: var(--background-color);
    color: var(--on-surface-color);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--motion-duration-medium) var(--motion-easing-standard),
        color var(--motion-duration-medium) var(--motion-easing-standard);
}

button, input, select, textarea { font-family: inherit; font-size: 1rem; color: inherit; }

.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    vertical-align: middle;
    line-height: 1;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 4px;
}
:root[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.25); }

#app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
}

#app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-xl);
    gap: var(--space-md);
    background: var(--color-surface-container);
    border-bottom: 1px solid var(--color-outline-variant);
    box-shadow: var(--shadow-level-1);
    position: sticky;
    top: 0;
    z-index: 10;
    flex-wrap: nowrap;
}

#app-header > * { min-width: 0; }

.app-title {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    flex: 1 1 auto;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex: 0 0 auto;
    flex-wrap: nowrap;
}

.quick-add-wrapper {
    position: relative;
}
.quick-add-popover {
    position: absolute;
    right: 0;
    top: calc(100% + var(--space-xs));
    display: none;
    flex-direction: column;
    gap: var(--space-xs);
    min-width: 220px;
    max-width: min(260px, 80vw);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-outline-variant);
    background: var(--color-surface-container-high);
    box-shadow: var(--shadow-level-2);
    z-index: 40;
}
.quick-add-popover.is-open {
    display: flex;
}
.quick-add-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    border: none;
    background: none;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    color: var(--color-on-surface);
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        transform var(--motion-duration-short) var(--motion-easing-standard);
}
.quick-add-option:hover,
.quick-add-option:focus-visible {
    background-color: var(--color-hover);
    outline: none;
}
.quick-add-option__icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
}
.quick-add-option__icon .material-symbols-outlined {
    font-size: 1.35rem;
}
.quick-add-option__icon--memo {
    background: var(--accent-memo);
}
.quick-add-option__icon--deadline {
    background: var(--accent-deadline);
}
.quick-add-option__content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.quick-add-option__label {
    font-weight: 700;
}
.quick-add-option__description {
    font-size: 0.8rem;
    color: var(--color-on-surface-variant);
    line-height: 1.3;
}

#user-profile-menu { position: relative; }
#user-profile-button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid transparent;
    cursor: pointer;
    transition: border-color var(--motion-duration-short) var(--motion-easing-standard);
}
#user-profile-button img { width: 100%; height: 100%; object-fit: cover; }
#user-profile-button:focus-visible {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.menu-dropdown {
    position: fixed;
    background: var(--color-surface-container-high);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-level-2);
    padding: var(--space-2xs);
    z-index: 200;
    border: 1px solid var(--color-outline-variant);
    min-width: 160px;
}
.menu-dropdown--hidden { display: none; }

#logout-button,
#settings-open-btn {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--color-on-surface);
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
    font-family: inherit;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
}
#logout-button:hover,
#settings-open-btn:hover { background-color: var(--color-hover); }

#main-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: auto 1fr;
    grid-template-areas: "planner planner" "memo deadline";
    gap: var(--space-lg);
    padding: var(--space-lg);
    flex: 1;
}

#weekly-view { grid-area: planner; }
#memo-view { grid-area: memo; }
#deadline-view { grid-area: deadline; }

.grid-item {
    background: var(--color-surface-container);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-level-1);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    min-height: 150px;
    transition: transform var(--motion-duration-short) var(--motion-easing-standard),
        box-shadow var(--motion-duration-short) var(--motion-easing-standard),
        border-color var(--motion-duration-short) var(--motion-easing-standard),
        min-height 0.3s ease;
}
.grid-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-level-2);
    border-color: var(--color-outline);
}

.scrollable { overflow: auto; flex: 1; padding-right: var(--space-2xs); }
#weekly-planner-content.scrollable {
    overflow: visible;
    padding-right: 0;
}
.scrollable::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.18); }
:root[data-theme="dark"] .scrollable::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.25); }

.icon-button {
    min-width: 40px;
    height: 40px;
    border-radius: var(--radius-pill);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--space-2xs);
    border: none;
    background: transparent;
    color: var(--color-on-surface-variant);
    cursor: pointer;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        color var(--motion-duration-short) var(--motion-easing-standard),
        box-shadow var(--motion-duration-short) var(--motion-easing-standard),
        transform var(--motion-duration-short) var(--motion-easing-standard);
}
.icon-button .sort-mode-label {
    font-size: 0.72rem;
    font-weight: 600;
    margin-left: 0.25rem;
    color: var(--color-on-surface-variant);
}
.icon-button:hover { background-color: var(--color-hover); color: var(--color-on-surface); }
.icon-button:active { transform: scale(0.98); }
.icon-button:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}
.icon-button.danger { color: var(--color-danger); }
.icon-button.danger:hover {
    background-color: rgba(214, 69, 69, 0.12);
    background-color: color-mix(in srgb, var(--color-danger) 15%, transparent);
    color: var(--color-danger);
}

.view-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-outline-variant);
}
.view-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.view-header .actions { display: flex; align-items: center; gap: var(--space-xs); }

#week-selector {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}
#week-selector .week-selector-actions {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}
#week-selector h2 { margin: 0; font-size: 1.25rem; font-weight: 600; }

#weekly-planner-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.week-desktop {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-md);
    overflow-x: auto;
    padding: 0 var(--space-md) var(--space-md);
    scroll-snap-type: x proximity;
    scroll-padding-inline: 50%;
    align-items: stretch;
    -webkit-overflow-scrolling: touch;
}
.week-desktop .day-card {
    flex: 0 0 600px;
    min-width: 600px;
    max-width: 600px;
}

.week-mobile {
    display: none;
    flex-direction: column;
    gap: var(--space-sm);
}

.week-mobile-header {
    display: none;
}

.week-mobile-body {
    width: 100%;
}

.week-mobile-day-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3xs);
    border: none;
    background: none;
    color: var(--color-on-surface-variant);
    padding: var(--space-xs);
    border-radius: var(--radius-pill);
    cursor: pointer;
    min-width: 48px;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        color var(--motion-duration-short) var(--motion-easing-standard);
}
.week-mobile-day-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}
.week-mobile-day-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-deadline);
    opacity: 1;
    transition: opacity var(--motion-duration-short) var(--motion-easing-standard);
}
.week-mobile-day-dot.is-hidden { opacity: 0; }
.week-mobile-day-number {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1;
    padding: 0 var(--space-2xs);
    border-radius: var(--radius-pill);
}
.week-mobile-day-name {
    font-size: 0.75rem;
    color: var(--color-on-surface-variant);
    line-height: 1;
}
.week-mobile-day-btn.is-today .week-mobile-day-number {
    border: 2px solid var(--color-primary);
}
.week-mobile-day-btn.is-active {
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
    color: var(--color-on-surface);
}
.week-mobile-day-btn.is-active .week-mobile-day-number {
    background: var(--color-primary);
    color: var(--color-on-primary);
}
.week-mobile-body .day-card {
    margin: 0;
}

.day-card {
    background: var(--color-surface-container-high);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-height: 160px;
    min-width: clamp(240px, 28vw, 360px);
    max-width: clamp(300px, 36vw, 440px);
    flex: 0 0 auto;
    scroll-snap-align: center;
    transition: border-color var(--motion-duration-short) var(--motion-easing-standard),
        box-shadow var(--motion-duration-short) var(--motion-easing-standard);
    animation: fade-in var(--motion-duration-medium) var(--motion-easing-standard);
    animation-fill-mode: both;
    position: relative;
    overflow: visible;
}
.day-card.today {
    border-color: var(--color-primary);
    background: var(--color-primary-container);
    background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface-container-high));
    box-shadow: inset 0 0 0 1px var(--color-primary-container);
}
.day-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    font-weight: 600;
}
.day-header span { display: inline-flex; gap: var(--space-2xs); align-items: baseline; }
.day-of-week { font-weight: 700; font-size: 1.1rem; }
ul.day-tasks { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: var(--space-xs); }
ul.day-tasks.drop-at-end::after {
    content: '';
    display: block;
    height: 0;
    border-bottom: 2px dashed var(--color-primary);
    margin-top: var(--space-xs);
    opacity: 0.6;
}
ul.day-tasks li.drop-before {
    position: relative;
}
ul.day-tasks li.drop-before::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-sm));
    right: calc(-1 * var(--space-sm));
    top: -6px;
    border-top: 2px dashed var(--color-primary);
    opacity: 0.6;
}

ul { list-style: none; padding: 0; margin: 0; }

.task-item, .plan-item, .memo-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    border-left: 4px solid var(--task-accent, transparent);
    background: var(--color-surface-container-higher);
    box-shadow: var(--shadow-level-1);
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        border-color var(--motion-duration-short) var(--motion-easing-standard),
        box-shadow var(--motion-duration-short) var(--motion-easing-standard),
        transform var(--motion-duration-short) var(--motion-easing-standard);
    animation: fade-in var(--motion-duration-medium) var(--motion-easing-standard);
    animation-fill-mode: both;
    will-change: transform, opacity;
    position: relative;
}
.task-item.move-panel-active,
.plan-item.move-panel-active,
.memo-item.move-panel-active {
    z-index: 1000;
}
.task-item[draggable="true"],
.memo-item[draggable="true"] {
    cursor: grab;
    user-select: none;
    -webkit-user-drag: element;
}
.task-item[draggable="true"] *,
.memo-item[draggable="true"] * {
    user-select: none;
}
.task-item[draggable="true"]:active,
.memo-item[draggable="true"]:active {
    cursor: grabbing;
}
.task-item:hover, .plan-item:hover, .memo-item:hover {
    background: color-mix(in srgb, var(--task-accent, var(--color-primary)) 8%, var(--color-surface-container-higher));
    border-color: var(--task-accent, var(--color-outline));
    box-shadow: var(--shadow-level-2);
    transform: translateY(-1px);
}
.task-item.dragging,
.memo-item.dragging {
    opacity: 0.4;
}
.task-item.completed, .plan-item.completed, .memo-item.completed {
    opacity: 0.7;
    box-shadow: none;
    background: color-mix(in srgb, var(--color-surface-variant) 35%, var(--color-surface-container-high));
    border-left-color: transparent;
}
.task-item--deadline {
    border-left-color: var(--accent-deadline);
    background: color-mix(in srgb, var(--accent-deadline) 12%, var(--color-surface-container-higher));
}
.task-item--deadline:hover {
    background: color-mix(in srgb, var(--accent-deadline) 20%, var(--color-surface-container-higher));
    border-color: color-mix(in srgb, var(--accent-deadline) 60%, transparent);
}
.task-item.completed .task-title, 
.plan-item.completed .task-title, 
.memo-item.completed .task-title {
    text-decoration: line-through;
    color: var(--color-on-surface-variant);
}
.task-item.overdue {
    border-color: color-mix(in srgb, var(--accent-deadline) 60%, transparent);
    background: color-mix(in srgb, var(--accent-deadline) 12%, var(--color-surface-container-higher));
}
.day-card.drop-target {
    border-color: var(--accent-deadline);
    box-shadow: var(--shadow-level-2);
}
.task-checkbox {
    width: 20px;
    height: 20px;
    margin-top: var(--space-2xs);
    accent-color: var(--color-primary);
    cursor: pointer;
    border-radius: 4px;
    flex-shrink: 0;
}

.task-item-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
    min-width: 0;
}

.task-title-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 0;
}

.task-title {
    font-weight: 600;
    font-size: 1rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tag-dot {
    width: var(--tag-dot-size);
    height: var(--tag-dot-size);
    border-radius: 50%;
    background: var(--tag-color, var(--color-outline));
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
    flex-shrink: 0;
}

.tag-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2xs);
    padding: 0 var(--space-xs);
    border-radius: var(--radius-pill);
    font-size: 0.85rem;
    background: var(--color-surface-container-high);
    background: color-mix(in srgb, var(--tag-color, var(--color-outline)) 18%, var(--color-surface-container) 82%);
    border: 1px solid var(--color-outline-variant);
    border: 1px solid color-mix(in srgb, var(--tag-color, var(--color-outline)) 35%, transparent);
    color: var(--color-on-surface);
}
.tag-chip__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--tag-color, var(--color-outline));
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}
.tag-chip__label { font-weight: 500; }

.category-chip {
    display: inline-flex;
    align-items: center;
    padding: 0 var(--space-xs);
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    background: color-mix(in srgb, var(--accent-deadline) 12%, var(--color-surface-container-high));
    border: 1px solid color-mix(in srgb, var(--accent-deadline) 25%, transparent);
    color: var(--color-on-surface);
}

.task-type {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3xs);
    padding: 0 var(--space-xs);
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: none;
    background: color-mix(in srgb, var(--task-accent, var(--color-primary)) 18%, var(--color-surface-container) 82%);
    color: var(--color-on-surface);
}
.task-type--deadline { --task-accent: var(--accent-deadline); }
.task-type--plan { --task-accent: var(--accent-plan); }
.task-type--memo { --task-accent: var(--accent-memo); }
.task-type--todo { --task-accent: var(--accent-deadline); }

.task-subtitle {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--color-on-surface-variant);
}
.task-subtitle span { display: inline-flex; align-items: center; gap: var(--space-2xs); }
.task-subtitle .material-symbols-outlined { font-size: 1rem; }
.task-meta { display: inline-flex; align-items: center; gap: var(--space-2xs); }

.task-overdue {
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--accent-deadline) 15%, var(--color-surface-container-high));
    border: 1px solid color-mix(in srgb, var(--accent-deadline) 35%, transparent);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}
.task-overdue__label {
    font-weight: 600;
    color: color-mix(in srgb, var(--accent-deadline) 70%, var(--color-on-surface));
}
.task-overdue--plan .task-overdue__label {
    color: color-mix(in srgb, var(--accent-plan) 70%, var(--color-on-surface));
}
.task-overdue--memo .task-overdue__label {
    color: color-mix(in srgb, var(--accent-memo) 70%, var(--color-on-surface));
}
.task-overdue__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}
.deadline-action-btn,
.plan-action-btn,
.memo-action-btn {
    border: none;
    border-radius: var(--radius-pill);
    padding: var(--space-2xs) var(--space-sm);
    background: var(--color-surface-container-high);
    border: 1px solid color-mix(in srgb, var(--accent-deadline) 30%, transparent);
    color: var(--color-on-surface);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        transform var(--motion-duration-short) var(--motion-easing-standard);
}
.deadline-action-btn:hover,
.plan-action-btn:hover,
.memo-action-btn:hover {
    background: color-mix(in srgb, var(--accent-deadline) 12%, var(--color-surface-container-high));
    transform: translateY(-1px);
}
.plan-action-btn {
    border-color: color-mix(in srgb, var(--accent-plan) 30%, transparent);
    background: color-mix(in srgb, var(--accent-plan) 12%, var(--color-surface-container-high));
}
.plan-action-btn:hover {
    background: color-mix(in srgb, var(--accent-plan) 16%, var(--color-surface-container-high));
}
.memo-action-btn {
    border-color: color-mix(in srgb, var(--accent-memo) 30%, transparent);
    background: color-mix(in srgb, var(--accent-memo) 12%, var(--color-surface-container-high));
}
.memo-action-btn:hover {
    background: color-mix(in srgb, var(--accent-memo) 16%, var(--color-surface-container-high));
}
.deadline-action-btn:focus-visible,
.plan-action-btn:focus-visible,
.memo-action-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}
.deadline-action-btn:active,
.plan-action-btn:active,
.memo-action-btn:active { transform: translateY(0); }

.deadline-plan-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2xs);
    margin-top: var(--space-2xs);
}
.deadline-plan-chip {
    display: inline-flex;
    flex-direction: column;
    gap: 2px;
    padding: calc(var(--space-2xs) / 2) var(--space-xs);
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--accent-plan) 15%, var(--color-surface-container-high));
    border: 1px solid color-mix(in srgb, var(--accent-plan) 25%, transparent);
    color: var(--color-on-surface);
    font-size: 0.75rem;
    line-height: 1.2;
    max-width: 160px;
    min-width: 0;
    cursor: pointer;
    transition: transform var(--motion-duration-short) var(--motion-easing-standard), box-shadow var(--motion-duration-short) var(--motion-easing-standard);
}
.deadline-plan-chip__title {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.deadline-plan-chip__meta {
    font-size: 0.7rem;
    opacity: 0.75;
    white-space: nowrap;
}
.deadline-plan-chip--overdue {
    background: color-mix(in srgb, var(--accent-plan) 22%, var(--color-surface-container-high));
    border-color: color-mix(in srgb, var(--accent-plan) 45%, transparent);
}
.deadline-plan-chip--completed {
    opacity: 0.6;
    background: color-mix(in srgb, var(--color-surface-variant) 35%, var(--color-surface-container-high));
    border-color: color-mix(in srgb, var(--color-surface-variant) 45%, transparent);
}
.deadline-plan-chip:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-level-1);
}
.deadline-plan-chip:focus-visible {
    outline: 2px solid var(--color-focus-ring, currentColor);
    outline-offset: 2px;
    box-shadow: var(--shadow-level-1);
}

.task-actions {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-left: auto;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--motion-duration-short) var(--motion-easing-standard),
        transform var(--motion-duration-short) var(--motion-easing-standard);
    transform: translateY(-2px);
}
.task-item:hover .task-actions,
.plan-item:hover .task-actions,
.memo-item:hover .task-actions,
.tag-list-item:hover .task-actions {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}
@media (hover: none) {
    .task-actions { opacity: 1; pointer-events: auto; transform: none; }
}

.completed-tasks-container {
    margin-top: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px dashed var(--color-outline-variant);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}
.completed-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
}
.completed-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2xs);
}
.completed-actions .icon-button {
    padding: var(--space-2xs);
}
.completed-tasks-container.is-collapsed .collapsible-content { display: none; }
.completed-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2xs);
    border: none;
    background: none;
    color: var(--color-on-surface-variant);
    font-weight: 600;
    cursor: pointer;
    padding: 0;
}
.completed-toggle-btn .material-symbols-outlined { font-size: 1.1rem; }
.collapsible-content.is-collapsed { display: none; }
.completed-count { font-size: 0.75rem; color: var(--color-on-surface-variant); }

.memo-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-outline-variant);
    position: relative;
    overflow: visible;
}
.memo-tasks {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}
.memo-section--plans .memo-section-header {
    background: color-mix(in srgb, var(--accent-plan) 12%, var(--color-surface-container-high));
}
.memo-section-header--plans {
    justify-content: flex-start;
    gap: var(--space-sm);
}
.memo-section-header--plans h4 {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin: 0;
}
.memo-section:last-child { border-bottom: none; padding-bottom: 0; }
.memo-section.drop-target {
    background: color-mix(in srgb, var(--accent-memo) 10%, transparent);
    border-radius: var(--radius-md);
    padding-inline: var(--space-sm);
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
}
.memo-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface-container-high);
    border-radius: var(--radius-sm);
    padding: var(--space-xs) var(--space-sm);
}
.memo-section-header--tag {
    justify-content: flex-start;
    gap: var(--space-sm);
}
.memo-section-header--tag h4 {
    margin: 0;
}

.memo-tasks--tag {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}
.memo-section-header h4 { margin: 0; font-size: 1rem; font-weight: 600; }
.memo-section-header .actions { display: flex; align-items: center; gap: var(--space-xs); }

.deadline-category-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
    padding: var(--space-xs) 0;
}
.deadline-category-section:last-child {
    margin-bottom: 0;
}
.deadline-category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface-container-high);
    border-radius: var(--radius-sm);
    padding: var(--space-xs) var(--space-sm);
    font-weight: 600;
    color: var(--color-on-surface);
}
.deadline-category-header h4 { margin: 0; font-size: 1rem; font-weight: 600; }
.deadline-category-header .actions { display: flex; align-items: center; gap: var(--space-xs); }
.deadline-category-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}
.deadline-tag-group {
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    background: var(--color-surface-container);
    padding: var(--space-sm);
}
.deadline-tag-group__header {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-2xs);
    font-weight: 700;
    color: var(--color-on-surface);
}
.deadline-tag-group__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
}
.deadline-date-group__header,
.deadline-tag-group__header .tag-dot {
    flex-shrink: 0;
}
.deadline-date-group {
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    background: var(--color-surface-container);
    padding: var(--space-sm);
}
.deadline-date-group__header {
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: var(--space-2xs);
    color: var(--color-on-surface);
}
.deadline-date-group__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
}
.deadline-category-list .empty-message {
    list-style: none;
    color: var(--color-on-surface-variant);
    padding: var(--space-xs) var(--space-sm);
    text-align: left;
}
.deadline-category-section.drop-target {
    background: color-mix(in srgb, var(--accent-deadline) 10%, var(--color-surface-container));
    border-radius: var(--radius-md);
}
.deadline-category-section--default {
    background: none;
    padding: 0;
}

.empty-message { color: var(--color-on-surface-variant); text-align: center; margin-top: var(--space-xl); }

.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(15, 15, 20, 0.65);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
    padding: var(--space-lg);
}
.modal-content {
    background: var(--color-surface-container);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-level-2);
    width: min(420px, 92vw);
    padding: var(--space-xl) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-height: 90vh;
    overflow-y: auto;
}

#tag-modal .modal-content { width: min(520px, 94vw); }

.form-group { display: flex; flex-direction: column; gap: var(--space-2xs); }
.form-group label,
.form-label { font-size: 0.9rem; font-weight: 600; color: var(--color-on-surface-variant); }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-outline-variant);
    background: var(--color-surface-container-high);
    color: var(--color-on-surface);
    transition: border-color var(--motion-duration-short) var(--motion-easing-standard),
        box-shadow var(--motion-duration-short) var(--motion-easing-standard);
}
.form-group textarea { resize: vertical; min-height: 3.5rem; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}
.form-group.inline-group { flex-direction: row; gap: var(--space-md); }
.form-group.inline-group > div { flex: 1; }

#date-input-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
}

.date-input-row {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.input-icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-outline-variant);
    background: var(--color-surface-container-higher);
    color: var(--color-on-surface-variant);
    cursor: pointer;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                border-color var(--motion-duration-short) var(--motion-easing-standard),
                color var(--motion-duration-short) var(--motion-easing-standard);
}
.input-icon-button:hover,
.input-icon-button:focus-visible {
    border-color: var(--color-primary);
    color: var(--color-on-surface);
    outline: none;
}
.input-icon-button.is-active {
    border-color: var(--color-primary);
    color: var(--color-on-surface);
    background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface-container-higher));
}
.input-icon-button .material-symbols-outlined {
    font-size: 1.25rem;
}

.date-quick-select-panel {
    position: absolute;
    top: calc(100% + var(--space-2xs));
    left: 0;
    width: max(260px, 100%);
    display: none;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-surface-container-high);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-level-3, 0 12px 30px rgba(0, 0, 0, 0.18));
    z-index: calc(var(--z-modal) - 1);
}
.date-quick-select-panel.is-open {
    display: flex;
}

.date-quick-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
}
.date-quick-section__label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-on-surface-variant);
}

.date-quick-week {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: var(--space-2xs);
}

.quick-weekday-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3xs);
    padding: var(--space-2xs) var(--space-xs);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-outline-variant);
    background: transparent;
    color: var(--color-on-surface-variant);
    cursor: pointer;
    font-size: 0.85rem;
    line-height: 1.15;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                border-color var(--motion-duration-short) var(--motion-easing-standard),
                color var(--motion-duration-short) var(--motion-easing-standard);
}
.quick-weekday-btn:hover,
.quick-weekday-btn:focus-visible {
    outline: none;
    border-color: var(--color-primary);
    color: var(--color-on-surface);
}
.quick-weekday-btn.is-today {
    border-style: solid;
    border-color: var(--color-primary);
}
.quick-weekday-btn.is-active {
    background: var(--color-primary);
    border-color: transparent;
    color: var(--color-on-primary);
}
.quick-weekday-btn__dow {
    font-weight: 600;
    font-size: 0.75rem;
}
.quick-weekday-btn__day {
    font-size: 0.8rem;
}

.quick-date-buttons {
    display: flex;
    gap: var(--space-xs);
}
.quick-date-btn {
    flex: 1;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-outline-variant);
    background: var(--color-surface-container-highest);
    color: var(--color-on-surface);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                color var(--motion-duration-short) var(--motion-easing-standard),
                border-color var(--motion-duration-short) var(--motion-easing-standard);
}
.quick-date-btn:hover { border-color: var(--color-primary); }
.quick-date-btn.is-active {
    background: var(--color-primary);
    color: var(--color-on-primary);
    border-color: transparent;
}

.priority-selector {
    display: flex;
    gap: var(--space-xs);
}
.priority-option {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-pill);
    border: 1px solid var(--color-outline-variant);
    cursor: pointer;
    font-weight: 600;
    background-color: var(--color-surface-container-highest);
    color: var(--color-on-surface);
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                color var(--motion-duration-short) var(--motion-easing-standard),
                border-color var(--motion-duration-short) var(--motion-easing-standard);
    user-select: none;
    min-width: 60px;
    justify-content: center;
}
.priority-option input {
    position: absolute;
    inset: 0;
    opacity: 0;
}
.priority-option:hover { border-color: var(--color-primary); }
.priority-option:has(input:checked) {
    border-color: transparent;
    color: var(--color-on-primary);
}
.priority-option--high:has(input:checked) { background-color: #ff6b6b; }
.priority-option--medium:has(input:checked) { background-color: #f7b733; color: #4a3510; }
.priority-option--low:has(input:checked) { background-color: var(--color-primary); }

.priority-chip {
    display: inline-flex;
    align-items: center;
    padding: 0 var(--space-xs);
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-on-primary);
    letter-spacing: 0.05em;
    background-color: var(--color-outline);
}
.priority-chip--high { background-color: #ff6b6b; }
.priority-chip--medium { background-color: #f7b733; color: #4a3510; }
.priority-chip--low { background-color: #4da6ff; }

.task-note-preview {
    margin-top: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    background-color: color-mix(in srgb, var(--color-surface-variant) 60%, transparent);
    color: var(--color-on-surface-variant);
    font-size: 0.85rem;
    line-height: 1.4;
    word-break: break-word;
}
.task-note-preview--compact {
    padding: var(--space-2xs) var(--space-xs);
    font-size: 0.78rem;
}
.task-note-preview--clamped {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: var(--note-line-clamp, 2);
    overflow: hidden;
}
.task-note-preview .task-note-link {
    color: var(--color-primary);
    text-decoration: underline;
    word-break: break-all;
}
.task-note-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2xs);
    margin-top: var(--space-2xs);
}
.task-note-link-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3xs);
    padding: var(--space-3xs) var(--space-2xs);
    border-radius: var(--radius-pill);
    background: color-mix(in srgb, var(--color-primary) 15%, transparent);
    color: var(--color-primary);
    font-size: 0.75rem;
    text-decoration: none;
}
.task-note-link-chip img {
    width: 14px;
    height: 14px;
    border-radius: 50%;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.button-primary,
.button-secondary {
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-lg);
    font-weight: 600;
    cursor: pointer;
    transition: box-shadow var(--motion-duration-short) var(--motion-easing-standard),
        transform var(--motion-duration-short) var(--motion-easing-standard);
}
.button-primary {
    background: var(--color-primary);
    color: var(--color-on-primary);
}
.button-primary:hover { box-shadow: var(--shadow-level-1); transform: translateY(-1px); }
.button-primary:active { transform: translateY(0); }

.button-secondary {
    background: var(--color-surface-variant);
    color: var(--color-on-surface);
}
.button-secondary:hover { box-shadow: var(--shadow-level-1); transform: translateY(-1px); }
.button-secondary:active { transform: translateY(0); }

#tag-list {
    border-top: 1px solid var(--color-outline-variant);
    margin-top: var(--space-sm);
    max-height: 45vh;
    overflow: auto;
}

.tag-list-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-outline-variant);
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        opacity var(--motion-duration-short) var(--motion-easing-standard);

    position: relative;
}
.tag-list-item:last-child { border-bottom: none; }
.tag-list-item[draggable="true"] { cursor: grab; }
.tag-list-item.dragging { opacity: 0.4; background: var(--color-primary-container); }
.tag-list-item.drag-over-before { border-top: 2px solid var(--color-primary); }
.tag-list-item.drag-over-after { border-bottom: 2px solid var(--color-primary); }

.tag-list-item .view-mode { display: flex; align-items: center; gap: var(--space-sm); flex: 1; }
.tag-list-item .task-actions { gap: var(--space-2xs); opacity: 1; pointer-events: auto; transform: none; }
.tag-color-preview {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--color-outline-variant);
    background-color: var(--tag-color, var(--color-surface-variant));
    flex-shrink: 0;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
}
.tag-name { font-weight: 600; }

.tag-edit-form { display: none; flex: 1; align-items: center; gap: var(--space-sm); }
.tag-list-item.is-editing .view-mode { display: none; }
.tag-list-item.is-editing .edit-mode { display: flex; flex-direction: column; gap: var(--space-sm); width: 100%; }
.tag-list-item.is-editing .tag-edit-form { display: flex; }
.tag-edit-form input {
    flex: 1;
    border: none;
    border-bottom: 1px solid var(--color-outline-variant);
    background: transparent;
    padding: var(--space-2xs) 0;
    color: var(--color-on-surface);
}
.tag-edit-form input:focus { outline: none; border-bottom-color: var(--color-primary); }

.archived-tags-header {
    margin-top: var(--space-lg);
    padding-top: var(--space-sm);
    border-top: 1px dashed var(--color-outline-variant);
    color: var(--color-on-surface-variant);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.tag-list-item.archived { opacity: 0.6; }
.tag-list-item.archived .tag-name { text-decoration: line-through; }

.tag-color-swatch {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--color-outline-variant);
    position: relative;
    background-color: var(--tag-color, var(--color-surface-variant));
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
        border-color var(--motion-duration-short) var(--motion-easing-standard);
}

#add-tag-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);

    position: relative;
}
#add-tag-item input {
    flex: 1;
    border: none;
    border-bottom: 1px solid var(--color-outline-variant);
    background: transparent;
    padding: var(--space-2xs) 0;
    color: var(--color-on-surface);
}
#add-tag-item input:focus { outline: none; border-bottom-color: var(--color-primary); }
#add-tag-btn { border-radius: var(--radius-pill); padding: var(--space-xs) var(--space-md); font-size: 0.9rem; }

.color-palette {
    display: none;
    position: absolute;
    left: 40px;
    top: 100%;
    margin-top: var(--space-2xs);
    background: var(--color-surface-container);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-level-2);
    padding: var(--space-sm);
    width: 220px;
    z-index: 30;
    grid-template-columns: repeat(auto-fill, minmax(32px, 1fr));
    gap: var(--space-sm);
}
.color-palette.visible { display: grid; }
.color-chip {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: transform var(--motion-duration-short) var(--motion-easing-standard),
        border-color var(--motion-duration-short) var(--motion-easing-standard);
    background-color: var(--tag-color, transparent);
}
.color-chip:hover { transform: scale(1.08); }
.color-chip.selected { border-color: var(--color-primary); }

@media (max-width: 600px) {
    #add-tag-item {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-xs);
    }
    #add-tag-item .tag-color-swatch {
        align-self: flex-start;
    }
    #add-tag-item input,
    #add-tag-btn {
        width: 100%;
    }
    #add-tag-item .color-palette {
        left: 0;
        right: 0;
        width: min(100%, 260px);
    }
}

#undo-notification {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: max(16px, env(safe-area-inset-bottom, 16px));
    transform: translateY(120%);
    max-width: 480px;
    width: auto;
    margin: 0 auto;
    background: var(--color-surface-container-high);
    color: var(--color-on-surface);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-level-2);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    transition: transform var(--motion-duration-medium) var(--motion-easing-standard),
        opacity var(--motion-duration-medium) var(--motion-easing-standard);
    z-index: var(--z-toast);
}
#undo-notification.show {
    transform: translateY(0);
    opacity: 1;
}
#undo-btn {
    border: none;
    background: transparent;
    color: var(--color-primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    display: none;
}

#login-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: background-color var(--motion-duration-medium) var(--motion-easing-standard);
}

.login-box {
    text-align: center;
    background: var(--color-surface-container);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-level-2);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
}
.login-box .logo { font-size: 64px; color: var(--color-primary); }
.login-box h1 { margin: 0; font-size: 2.5rem; font-weight: 700; }
.login-box p { margin: 0 0 var(--space-md); color: var(--color-on-surface-variant); }
#login-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-surface-container-high);
    color: var(--color-on-surface);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-pill);
    padding: var(--space-sm) var(--space-lg);
    cursor: pointer;
    font-weight: 600;
    transition: box-shadow var(--motion-duration-short) var(--motion-easing-standard);
}
#login-button:hover { box-shadow: var(--shadow-level-1); }
#login-button img { width: 18px; height: 18px; }

/* --- レスポンシブレイアウト --- */

/* 769px以上 (タブレット, PC) のデフォルトスタイル */
#main-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: auto 1fr;
    grid-template-areas:
        "planner planner"
        "memo deadline";
    gap: var(--space-lg);
    padding: var(--space-lg);
    flex: 1;
}

#weekly-view { grid-area: planner; }
#memo-view { grid-area: memo; }
#deadline-view { grid-area: deadline; }

.week-mobile {
    display: none; /* PCではモバイル用週表示は常に非表示 */
}

@media (max-width: 1024px) {
    .week-desktop {
        flex-wrap: nowrap;
        justify-content: flex-start;
        overflow-x: auto;
        scroll-snap-type: x proximity;
    }
}

/* 768px以下 (スマートフォン) のスタイル */
@media (max-width: 768px) {
    #main-grid {
        /* 1カラムレイアウトに変更 */
        grid-template-columns: 1fr;
        grid-template-areas:
            "planner"
            "deadline"
            "memo";
        grid-template-rows: auto auto auto;
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .grid-item {
        padding: var(--space-md);
    }

    #app-header {
        padding: var(--space-sm) var(--space-lg);
    }
    .app-title {
        font-size: 1.35rem;
    }

    /* 週表示をモバイル専用UIに切り替え */
    .week-desktop {
        display: none !important;
    }
    .week-mobile {
        display: flex !important;
    }
    .week-mobile-body {
        width: 100%;
    }
    .week-mobile .day-card,
    .day-card-mobile {
        width: 100%;
        max-width: 100%;
        min-width: 0;
        flex: 1 1 auto;
    }
    .week-mobile-header {
        display: flex;
        gap: var(--space-xs);
        overflow-x: auto;
        padding: 0 var(--space-xs);
    }
    .date-quick-select-panel {
        width: 100%;
    }
    .day-card {
        min-width: 100%;
        max-width: 100%;
        width: 100%;
        flex: 1 1 100%;
    }

    /* ヘッダーのレイアウト調整 */
    .view-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    /* モーダルをシート形式で下から表示 */
    .modal-overlay {
        padding: var(--space-xs);
        align-items: flex-end;
    }
    .modal-content {
        width: 100%;
        max-width: 100%;
        padding: var(--space-lg) var(--space-md);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        max-height: 92vh;
    }

    .menu-dropdown #logout-button,
    .menu-dropdown #settings-open-btn {
        padding: var(--space-md) var(--space-lg);
        font-size: 1.05rem;
        min-height: 52px;
    }
}

/* 600px以下での細かいレイアウト調整 */
@media (max-width: 600px) {
    #app-header {
        padding: var(--space-xs) var(--space-md);
        gap: var(--space-xs);
    }
    .app-title {
        font-size: 1.3rem;
    }
    .header-actions {
        gap: var(--space-2xs);
    }
    .icon-button {
        min-width: 36px;
        height: 36px;
        padding: 0 var(--space-3xs);
    }
    #main-grid {
        padding: var(--space-sm);
        gap: var(--space-sm);
    }
    .grid-item {
        padding: var(--space-sm);
    }
    #weekly-planner-content {
        padding: 0 var(--space-sm) var(--space-sm);
    }
    .day-card {
        padding: var(--space-sm);
        gap: var(--space-xs);
    }
    .task-title {
        white-space: normal;
        line-height: 1.4;
    }
}

/* 480px以下 (小さいスマートフォン) のスタイル調整 */
@media (max-width: 480px) {
    body {
        overflow-x: hidden;
    }
    #app-container {
        width: 100%;
        max-width: 100vw;
    }
    #week-selector {
        display: grid;
        grid-template-columns: auto 1fr auto;
        align-items: center;
        column-gap: var(--space-xs);
        row-gap: var(--space-2xs);
        width: 100%;
    }
    #week-selector h2 {
        grid-column: 2;
        text-align: center;
        font-size: 1.1rem;
        min-width: 0;
    }
    #week-selector .week-selector-actions {
        justify-content: flex-end;
    }
    .header-actions {
        gap: var(--space-3xs);
        flex-wrap: nowrap;
        justify-content: flex-end;
    }
    #app-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        text-align: left;
        flex-wrap: nowrap;
        gap: var(--space-xs);
        padding: var(--space-sm) var(--space-md);
    }
    .app-title {
        width: auto;
        flex: 1 1 auto;
        min-width: 0;
        text-align: left;
        font-size: 1.2rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .header-actions {
        width: auto;
        white-space: nowrap;
    }
    .grid-item {
        padding: var(--space-sm);
        padding-inline: var(--space-xs);
        width: 100%;
        max-width: 100%;
        overflow: hidden;
    }
    #main-grid {
        width: 100%;
        max-width: 100vw;
        box-sizing: border-box;
    }
    .icon-button .sort-mode-label {
        display: none;
    }

    .icon-button {
        min-width: 32px;
        height: 32px;
        padding: 0 var(--space-3xs);
    }

    #main-grid {
        padding: var(--space-md) var(--space-xs); /* 左右のパディングを狭くする */
        gap: var(--space-sm); /* カード間の隙間を少し狭くする */
    }

    .task-item, .plan-item, .memo-item {
        padding-left: var(--space-sm); /* タスクカードの左パディングを調整 */
        padding-right: var(--space-sm); /* タスクカードの右パディングを調整 */
    }
    
    .view-header {
        padding-left: var(--space-xs); /* ビューヘッダーの左パディングを調整 */
        padding-right: var(--space-xs); /* ビューヘッダーの右パディングを調整 */
    }
    .view-header .actions {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: var(--space-2xs);
    }
}

/* --- THEME TRANSITION --- */
#app-header, .grid-item, .task-item, .plan-item, .memo-item,
.modal-content, .day-card, .memo-section-header, .deadline-category-header,
.login-box, #undo-notification, .tag-list-item,
button, input, select, textarea {
    transition: background-color var(--motion-duration-medium) var(--motion-easing-standard),
                color var(--motion-duration-medium) var(--motion-easing-standard),
                border-color var(--motion-duration-medium) var(--motion-easing-standard),
                box-shadow var(--motion-duration-short) var(--motion-easing-standard);
}

.task-item:hover, .plan-item:hover, .memo-item:hover,
.grid-item:hover, .button-primary:hover, .button-secondary:hover {
    transition: background-color var(--motion-duration-medium) var(--motion-easing-standard),
                color var(--motion-duration-medium) var(--motion-easing-standard),
                border-color var(--motion-duration-medium) var(--motion-easing-standard),
                box-shadow var(--motion-duration-short) var(--motion-easing-standard),
                transform var(--motion-duration-short) var(--motion-easing-standard);
}

.grid-item .scrollable {
    transition: max-height 0.3s ease, opacity 0.25s ease;
    overflow: auto;
    max-height: 1200px;
    opacity: 1;
}

/* 折りたたまれた状態のスタイル */
.grid-item.is-collapsed .scrollable {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: 0;
    margin-bottom: 0;
}

.grid-item.is-collapsed {
    min-height: auto;
    padding-top: var(--space-md);
    padding-bottom: var(--space-md);
    gap: var(--space-sm);
}

.grid-item .toggle-view-btn .material-symbols-outlined {
    transition: transform 0.3s ease;
}

/* 折りたたまれた時のボタンアイコンの回転 */
.grid-item.is-collapsed .toggle-view-btn .material-symbols-outlined {
    transform: rotate(180deg);
}
/* タスクカード内のアクションボタンの配置調整 */
.task-item-content {
    position: relative; /* アクションパネルの基準位置にする */
}

/* 移動ボタンのスタイル */
.task-actions .move-task-btn {
    /* 必要に応じて他のアクションボタンと区別するスタイルを追加 */
}

/* 移動アクションパネルのスタイル */
.task-move-panel {
    display: none; /* 通常は非表示 */
    position: absolute;
    bottom: -8px; /* カードの下端から少しはみ出すように配置 */
    left: 50%;
    transform: translateX(-50%) translateY(100%);
    background: var(--color-surface-container-high);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-level-2);
    padding: var(--space-xs);
    z-index: 999;
    gap: var(--space-xs);
    border: 1px solid var(--color-outline-variant);
}
.task-move-panel.is-visible {
    display: flex; /* is-visibleクラスが付いたら表示 */
}

.task-move-panel .move-action-btn {
    border: none;
    border-radius: var(--radius-pill);
    padding: var(--space-2xs) var(--space-sm);
    background: var(--color-surface-container-highest);
    border: 1px solid var(--color-outline-variant);
    color: var(--color-on-surface);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard),
                transform var(--motion-duration-short) var(--motion-easing-standard);
}
.task-move-panel .move-action-btn:hover {
    background-color: var(--color-hover);
    transform: translateY(-1px);
}
.deadline-tag-group__title {
    font-size: 0.9rem;
}

.memo-date-group {
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-surface-container-high);
}
.memo-date-group__header {
    font-weight: 700;
    margin-bottom: var(--space-2xs);
    font-size: 0.85rem;
}
.memo-date-group__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
}

/* ===== Googleカレンダーイベント ===== */
.gcal-events {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 4px var(--space-xs);
    margin-bottom: var(--space-2xs);
    border-left: 2px solid var(--accent-teal);
    background: rgba(90, 200, 250, 0.08);
    border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
}
.gcal-event {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--on-surface-variant-color);
    line-height: 1.3;
    padding-left: 4px;
    border-left: 3px solid;
}
.gcal-event__icon {
    font-size: 12px;
    flex-shrink: 0;
}
.gcal-event__time {
    flex-shrink: 0;
    font-weight: 600;
    min-width: 32px;
    color: inherit;
}
.gcal-event__title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===== 設定モーダル ===== */
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}
.modal-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
}
.settings-section {
    margin-bottom: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}
.settings-section__title {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--on-surface-variant-color);
    margin: 0 0 var(--space-2xs);
}
.settings-section__title .material-symbols-outlined {
    font-size: 16px;
}
.settings-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-outline-variant);
}
.settings-row:last-child {
    border-bottom: none;
}
.settings-row__label {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 0.9rem;
    font-weight: 500;
}
.settings-row__desc {
    font-size: 0.75rem;
    color: var(--on-surface-variant-color);
    font-weight: 400;
}
.settings-row__unit {
    font-size: 0.85rem;
    color: var(--on-surface-variant-color);
}
.settings-hour-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}
.settings-hour-input {
    width: 56px;
    padding: 6px 8px;
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-xs);
    background: var(--surface-color);
    color: var(--on-surface-color);
    font-size: 0.9rem;
    text-align: center;
}

/* トグルスイッチ */
.toggle-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    flex-shrink: 0;
}
.toggle-switch input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}
.toggle-switch__track {
    width: 44px;
    height: 26px;
    background: var(--color-outline-variant);
    border-radius: var(--radius-pill);
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
    position: relative;
}
.toggle-switch__track::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    box-shadow: var(--shadow-level-1);
    transition: transform var(--motion-duration-short) var(--motion-easing-standard);
}
.toggle-switch input:checked + .toggle-switch__track {
    background: var(--primary-color);
}
.toggle-switch input:checked + .toggle-switch__track::after {
    transform: translateX(18px);
}

/* カレンダー連携ステータス */
.calendar-status--connected {
    color: var(--status-success);
}
.hidden {
    display: none !important;
}

/* 設定ボタン（ユーザーメニュー内） */
#settings-open-btn {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--color-on-surface);
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
}
#settings-open-btn:hover {
    background-color: var(--color-hover);
}

/* ボタンサイズバリアント */
.button-sm {
    padding: var(--space-2xs) var(--space-sm);
    font-size: 0.8rem;
    border-radius: var(--radius-xs);
}

/* カレンダーリスト */
.calendar-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-surface-container-low);
    border-radius: var(--radius-sm);
    max-height: 200px;
    overflow-y: auto;
    min-width: 0;
}
.calendar-list-item {
    display: flex;
    align-items: center;
}
.calendar-list-item__label {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    cursor: pointer;
    flex: 1;
    padding: var(--space-2xs) var(--space-xs);
    border-radius: var(--radius-xs);
    transition: background-color var(--motion-duration-short) var(--motion-easing-standard);
    min-width: 0;
}
.calendar-list-item__label:hover {
    background-color: var(--color-hover);
}
.calendar-list-item__label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    flex-shrink: 0;
    min-width: 16px;
}
.calendar-list-item__color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    flex-shrink: 0;
}
.calendar-list-item__name {
    flex: 1;
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.calendar-list-item__badge {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 4px;
    background: var(--primary-color);
    color: white;
    border-radius: 2px;
    flex-shrink: 0;
}
.calendar-list-empty,
.calendar-list-loading,
.calendar-list-error {
    font-size: 0.85rem;
    color: var(--on-surface-variant-color);
    text-align: center;
    padding: var(--space-md);
}