/* ========================================
   CSS Variables & Theme
   ======================================== */
:root {
    /* Colors */
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-bg-hover: #475569;

    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --color-accent: #6366f1;
    --color-accent-hover: #818cf8;
    --color-danger: #ef4444;
    --color-danger-hover: #f87171;
    --color-success: #10b981;

    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-light: rgba(255, 255, 255, 0.05);

    /* Glass effect */
    --glass-bg: rgba(30, 41, 59, 0.8);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Gantt specific */
    --gantt-cell-width: 40px;
    --gantt-row-height: 24px;
    --member-column-width: 100px;
}

/* ========================================
   Light Theme
   ======================================== */
[data-theme="light"] {
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #f1f5f9;
    --color-bg-tertiary: #e2e8f0;
    --color-bg-hover: #cbd5e1;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-border: rgba(0, 0, 0, 0.12);
    --color-border-light: rgba(0, 0, 0, 0.06);
    --glass-bg: rgba(248, 250, 252, 0.92);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .member-row:hover {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .calendar-day:hover {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .checkbox-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .member-name-vertical {
    color: rgba(0, 0, 0, 0.85) !important;
    text-shadow: none !important;
}

[data-theme="light"] .auth-screen {
    background: radial-gradient(circle at top right, #c7d2fe, #e0e7ff);
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
}

/* ========================================
   App Container
   ======================================== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100vw;
    overflow-x: hidden;
}

/* ========================================
   Header
   ======================================== */
.header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.current-period {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.btn-secondary:hover {
    background: var(--color-bg-hover);
}

.btn-danger {
    background: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    background: var(--color-danger-hover);
}

.btn-link {
    background: transparent;
    color: var(--color-accent);
    text-decoration: underline;
    padding: 0;
    font-weight: 400;
}

.btn-link:hover {
    color: var(--color-accent-hover);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
}

.btn-icon {
    font-size: 1.1em;
}

/* View Toggle */
.view-toggle {
    display: flex;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: 3px;
}

.toggle-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-btn.active {
    background: var(--color-accent);
    color: white;
}

.toggle-btn:hover:not(.active) {
    color: var(--color-text-primary);
}

/* Date Navigation */
.date-navigation {
    display: flex;
    gap: var(--spacing-xs);
}

.nav-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.nav-btn.today {
    width: auto;
    padding: 0 var(--spacing-md);
    font-weight: 600;
}

/* ========================================
   Gantt Chart
   ======================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.gantt-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.member-column-header {
    flex-shrink: 0;
    width: var(--member-column-width);
    padding: var(--spacing-md);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-right: 1px solid var(--color-border);
    position: sticky;
    left: 0;
    z-index: 20;
    background: var(--color-bg-secondary);
}

/* 日付行（スクロール領域内。「メンバー」を同日付行に含め角の空きを削除） */
.gantt-date-row {
    display: flex;
    flex-shrink: 0;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.gantt-date-cells {
    flex: 1;
    display: flex;
    min-width: fit-content;
}

.gantt-date-row-member {
    flex-shrink: 0;
}

.date-cell {
    flex-shrink: 0;
    width: var(--gantt-cell-width);
    padding: var(--spacing-sm) var(--spacing-xs);
    text-align: center;
    border-right: 1px solid var(--color-border-light);
}

.date-cell.weekend {
    background: rgba(239, 68, 68, 0.1);
}

.date-cell.today {
    background: rgba(99, 102, 241, 0.2);
}

.date-day {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.date-num {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.date-cell.today .date-num {
    color: var(--color-accent);
}

.date-cell.weekend .date-num {
    color: var(--color-danger);
}

/* Gantt Body */
.gantt-body {
    flex: 1;
    overflow: auto;
}

/* 右の空バーを削除（コンテンツ幅に合わせる） */
.gantt-scroll-content {
    display: inline-flex;
    flex-direction: column;
    min-width: min-content;
}

/* スマホ: 左右2ペイン（メンバー固定＋タイムラインスクロール） */
@media (max-width: 767px) {
    .gantt-body {
        display: flex;
        overflow: hidden;
    }
    .gantt-member-pane {
        flex-shrink: 0;
        width: var(--member-column-width);
        overflow-y: auto;
        overflow-x: hidden;
        border-right: 1px solid var(--color-border);
        background: var(--color-bg-primary);
    }
    .gantt-date-row-spacer {
        flex-shrink: 0;
        min-height: 0;
    }
    .gantt-member-pane {
        --member-column-width: 44px;
        width: 44px;
    }
    .gantt-member-pane .member-info.member-info-mobile {
        position: static;
        border-right: none;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: var(--gantt-row-height);
        padding: 2px 4px;
    }
    .gantt-member-pane .member-info.member-info-mobile .member-name.member-name-vertical {
        writing-mode: vertical-rl;
        text-orientation: mixed;
        letter-spacing: 0.05em;
        line-height: 1.4;
        color: rgba(255, 255, 255, 0.95);
        text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    }
    .gantt-timeline-pane {
        flex: 1;
        min-width: 0;
        overflow: auto;
    }
    .gantt-timeline-pane .member-row {
        border-bottom: 1px solid var(--color-border-light);
    }
}

.member-row {
    display: flex;
    min-height: var(--gantt-row-height);
    border-bottom: 1px solid var(--color-border-light);
}

.member-row:hover {
    background: rgba(255, 255, 255, 0.02);
}

.member-info {
    flex-shrink: 0;
    width: var(--member-column-width);
    padding: 2px 16px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-right: 1px solid var(--color-border);
    cursor: pointer;
    transition: background var(--transition-fast);
    position: sticky;
    left: 0;
    z-index: 15;
    background: var(--color-bg-primary);
}

.member-info:hover {
    background: var(--color-bg-secondary);
}

.member-avatar {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.member-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-primary);
    word-break: break-all;
    line-height: 1.2;
}

/* Timeline Area */
.member-timeline {
    position: relative;
    flex: 1;
    display: flex;
    min-width: fit-content;
}

.timeline-grid {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.grid-cell {
    flex-shrink: 0;
    width: var(--gantt-cell-width);
    height: 100%;
    border-right: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.grid-cell:hover {
    background: rgba(99, 102, 241, 0.1);
}

.grid-cell.weekend {
    background: rgba(239, 68, 68, 0.05);
}

.grid-cell.today {
    background: rgba(99, 102, 241, 0.1);
}

/* Tasks */
.tasks-container {
    position: relative;
    flex: 1;
    min-height: 100%;
    pointer-events: none;
}

/* Member Row Reordering */
.member-row.dragging-member,
.member-info.dragging-member {
    opacity: 0.5;
    background: var(--color-bg-hover);
    border: 2px dashed var(--color-accent);
}

.member-info[draggable="true"] {
    cursor: grab;
}

.member-info[draggable="true"]:active {
    cursor: grabbing;
}

/* Drag Active State - Ensure clicks pass through to grid during drag */
body.dragging-active .task-bar {
    pointer-events: none;
}

.task-bar {
    position: absolute;
    /* height and top handled by JS for multi-row layout */
    border-radius: var(--radius-sm);
    padding: 0 var(--spacing-sm);
    display: flex;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    pointer-events: auto;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    z-index: 5;
}

.task-bar:hover {
    transform: translateX(2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 10;
}

.task-bar-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
    padding-right: 8px;
}

/* スマホ: paddingを最小化して予定幅を最大限利用、省略はJSで".." */
@media (max-width: 767px) {
    .task-bar.task-bar-mobile {
        padding: 0 3px;
    }
    .task-bar.task-bar-mobile .task-bar-title {
        padding-right: 4px;
    }
}

/* Drag Selection */
.grid-cell.selecting {
    background-color: rgba(79, 70, 229, 0.2) !important;
}

body.dragging-active .task-bar {
    pointer-events: none;
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: var(--spacing-xl);
    text-align: center;
}

.empty-state.visible {
    display: flex;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-text {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Modal
   ======================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.modal-form {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.form-group input[type="text"],
.form-group input[type="date"] {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

/* Ensure full display of tasks */
.member-timeline {
    position: relative;
    flex: 1;
    min-height: 60px;
    /* Base height */
}

/* Calendar View Adjustments */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: minmax(120px, auto);
    /* Allow rows to grow with content */
    flex: 1;
    overflow-y: auto;
}

/* Color Picker */
.color-picker {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.color-option {
    width: 36px;
    height: 36px;
    border: 3px solid transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.selected {
    border-color: white;
    box-shadow: 0 0 0 2px var(--color-bg-primary);
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.form-actions-right {
    display: flex;
    gap: var(--spacing-sm);
    margin-left: auto;
}

/* ========================================
   Add Task Button (floating)
   ======================================== */
.add-task-btn {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--color-accent);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5;
}

.member-row:hover .add-task-btn {
    opacity: 1;
}

.add-task-btn:hover {
    transform: translateY(-50%) scale(1.1);
    background: var(--color-accent-hover);
}

/* ========================================
   Scrollbar
   ======================================== */
.gantt-body::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.gantt-body::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

.gantt-body::-webkit-scrollbar-thumb {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
}

.gantt-body::-webkit-scrollbar-thumb:hover {
    background: var(--color-bg-hover);
}

/* ========================================
   Responsive
   ======================================== */
@media (min-width: 768px) {
    .modal {
        border-radius: var(--radius-lg);
        margin-bottom: var(--spacing-xl);
    }

    .modal-overlay {
        align-items: center;
    }

    :root {
        --member-column-width: 160px;
        --gantt-cell-width: 50px;
    }
}

@media (max-width: 480px) {
    .header-controls {
        justify-content: space-between;
    }

    .modal-form {
        padding: var(--spacing-md);
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .current-period {
        width: 100%;
        text-align: center;
        margin-top: var(--spacing-sm);
    }

    .btn-text {
        display: none;
    }

    .btn-icon {
        font-size: 1.2rem;
    }

    :root {
        --gantt-cell-width: 40px;
        --member-column-width: 90px;
    }

    .member-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
    }

    .member-name {
        font-size: 0.75rem;
    }
}

/* Drag Selection */
.grid-cell.selecting {
    background: rgba(99, 102, 241, 0.3) !important;
}

.grid-cell.selected {
    background: rgba(99, 102, 241, 0.3) !important;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Multi-member Selection in Task Modal */
.checkbox-list-container {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--color-text-primary);
}

.checkbox-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.checkbox-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
}

.checkbox-item.all-select {
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 8px;
    padding-bottom: 10px;
    font-weight: 600;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 4px;
}

/* Modal Enhancements */
.modal-body {
    padding: var(--spacing-lg);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.member-row {
    animation: fadeIn var(--transition-normal) ease;
}

.task-bar {
    animation: slideUp var(--transition-normal) ease;
}

/* Date Adjustment Controls */
.date-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.date-adjust-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.date-adjust-btn:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.date-adjust-btn:active {
    transform: scale(0.95);
}

.date-input-wrapper input[type="date"] {
    flex: 1;
}

/* ========================================
   Monthly Calendar View
   ======================================== */
.calendar-view {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--color-bg-primary);
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

.calendar-header div {
    padding: var(--spacing-sm);
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.calendar-grid {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
    background: var(--color-bg-secondary);
}

.calendar-header-wrapper {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-light);
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    padding: var(--spacing-sm) 0;
    text-align: center;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-text-muted);
}

.calendar-week {
    position: relative;
    min-height: 120px;
    border-bottom: 1px solid var(--color-border-light);
}

.calendar-events-layer {
    position: relative;
    width: 100%;
    padding-top: 25px;
    /* Leave space for day numbers */
    padding-bottom: 5px;
    pointer-events: none;
    z-index: 10;
}

.calendar-days-bg {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.calendar-day {
    border-right: 1px solid var(--color-border-light);
    padding: var(--spacing-xs);
    position: relative;
    background: var(--color-bg-primary);
    transition: background var(--transition-fast);
}

.calendar-day:last-child {
    border-right: none;
}

.calendar-day:hover {
    background: rgba(255, 255, 255, 0.02);
}

.calendar-day.other-month {
    opacity: 0.3;
}

.calendar-day.weekend {
    background: rgba(239, 68, 68, 0.02);
}

.calendar-day.today {
    background: rgba(99, 102, 241, 0.1);
}

.day-num {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.calendar-day.today .day-num {
    color: var(--color-accent);
}

.calendar-events-layer {
    position: relative;
    pointer-events: none;
    width: 100%;
    height: 100%;
}

.calendar-event-row {
    position: relative;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0;
    height: 22px;
    /* Fixed height for each row of tasks */
    margin-bottom: 2px;
}

.mini-task {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: auto;
    margin: 0 2px;
    height: 20px;
    transition: all var(--transition-fast);
}

.mini-task:hover {
    transform: translateX(2px);
    z-index: 5;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.member-initial {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.task-name {
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Group User List */
.group-user-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.user-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.user-item-info {
    display: flex;
    flex-direction: column;
}

.user-item-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.user-item-id {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.user-role-badge {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 10px;
    background: var(--color-accent);
    color: white;
    margin-left: 8px;
}

/* Task Resizing - .task-bar はガント用に position:absolute のまま（上で定義）でリサイズハンドルを子に持つ */
.resize-handle {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 8px;
    cursor: ew-resize;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: opacity 0.2s;
}

.task-bar:hover .resize-handle {
    opacity: 1;
}

.resizing-active .task-bar {
    cursor: ew-resize;
}

/* カレンダー・ドラッグ選択 */
.calendar-day.selecting {
    background-color: rgba(79, 70, 229, 0.15) !important;
}

body.dragging-active {
    cursor: col-resize;
    user-select: none;
}

body.moving-active {
    cursor: grabbing !important;
    user-select: none;
}

body.moving-active .task-bar,
body.moving-active .mini-task {
    cursor: grabbing !important;
    opacity: 0.8;
}

.mini-task {
    cursor: pointer;
    transition: transform 0.1s;
}

.mini-task:hover {
    transform: translateX(2px);
}

/* Fullscreen Auth Screen */
.auth-screen {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: radial-gradient(circle at top right, #312e81, #0f172a);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    animation: fadeIn var(--transition-normal);
}

.auth-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-xl);
    box-shadow: var(--glass-shadow);
    animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-logo {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.auth-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

.auth-footer {
    margin-top: var(--spacing-lg);
    text-align: center;
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
}

.error-message {
    color: var(--color-danger);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-md);
    min-height: 1.2em;
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}