/* CSS Variables */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --today-highlight: #3b82f6;
    --day-header-bg: var(--bg-tertiary);
    --day-header-border: var(--border);
    --day-header-name: var(--text-muted);
    --day-header-date: var(--text-primary);
    --logo-primary: #eaf2ff;
    --task-row-border: rgba(51, 65, 85, 0.3);
    --task-row-hover: rgba(255, 255, 255, 0.04);
    --task-row-hover-soft: rgba(255, 255, 255, 0.03);
    --task-selected-bg: rgba(59, 130, 246, 0.16);
    --task-selected-outline: rgba(59, 130, 246, 0.35);
    --drop-active-bg: rgba(59, 130, 246, 0.06);
    --drop-indicator-shadow: rgba(59, 130, 246, 0.5);
    --danger-soft-bg: rgba(239, 68, 68, 0.15);
    --modal-overlay: rgba(0, 0, 0, 0.7);
    --day-column-min-height: 420px;
    --backlog-column-min-height: 220px;
}

[data-theme="light"] {
    --bg-primary: #f5f8ff;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9effa;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --success: #059669;
    --border: #cbd5e1;
    --shadow: rgba(15, 23, 42, 0.12);
    --today-highlight: #2563eb;
    --day-header-bg: #dbe8ff;
    --day-header-border: #a8c0ea;
    --day-header-name: #334155;
    --day-header-date: #0f172a;
    --logo-primary: #1e293b;
    --task-row-border: rgba(148, 163, 184, 0.45);
    --task-row-hover: rgba(37, 99, 235, 0.08);
    --task-row-hover-soft: rgba(37, 99, 235, 0.06);
    --task-selected-bg: rgba(37, 99, 235, 0.14);
    --task-selected-outline: rgba(37, 99, 235, 0.42);
    --drop-active-bg: rgba(37, 99, 235, 0.08);
    --drop-indicator-shadow: rgba(37, 99, 235, 0.35);
    --danger-soft-bg: rgba(220, 38, 38, 0.12);
    --modal-overlay: rgba(15, 23, 42, 0.42);
}

/* App Loading Splash Screen - Shared by login.html and index.html */
.app-loading,
.auth-loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
}

.app-loading-content,
.auth-loading-content {
    text-align: center;
}

.app-loading-logo,
.auth-loading-logo {
    width: 90%;
    max-width: 600px;
    height: auto;
    margin: 0 auto 2rem;
    display: block;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto;
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-top-color: #3b82f6;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

html, body {
    height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.2s ease, color 0.2s ease;
}

body.modal-open {
    overflow: hidden !important;
    overscroll-behavior: none;
    height: 100dvh;
}

body.modal-open .week-container,
body.modal-open .week-grid {
    overflow: hidden !important;
}

/* App Container */
#app {
    min-height: 100vh;
    height: auto;
    display: flex;
    flex-direction: column;
    overflow: visible;
}

/* Header */
.app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1.5rem;
}

/* Header Left: Logo + Search */
.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.app-logo {
    flex-shrink: 0;
    height: 38px;
    width: auto;
}

.logo-text-primary {
    fill: var(--logo-primary);
}

.logo-text-accent {
    fill: var(--accent);
}

/* Header Center: Navigation + View Controls */
.header-center {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Week Navigation */
.week-navigation {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

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

.week-info {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 130px;
    text-align: center;
}

.today-btn {
    background: var(--accent);
    border: none;
    color: white;
    padding: 0.3rem 0.85rem;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.15s;
    flex-shrink: 0;
}

.today-btn:hover {
    background: var(--accent-hover);
}

/* Outline variant — same shape/size as .today-btn, but visually secondary (e.g. the
   Fokus button next to Heute: it opens a whole overlay, a bigger jump than Heute's
   in-place navigation, so it shouldn't compete with it as an equally-weighted action). */
.today-btn.today-btn-outline {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
}

.today-btn.today-btn-outline:hover {
    background: var(--accent);
    color: white;
}

/* View Controls */
.view-controls {
    display: flex;
    gap: 0.2rem;
    background: var(--bg-tertiary);
    padding: 0.15rem;
    border-radius: 5px;
    border: 1px solid var(--border);
}

.view-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.75rem;
    transition: all 0.15s;
    min-width: 28px;
}

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

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

/* Header Right: Action Buttons */
.header-right {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    justify-content: flex-end;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

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

.icon-btn.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
    color: #ef4444;
}

/* Refresh Button Animation */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.icon-btn.spinning svg {
    animation: spin 0.5s linear;
}

.multi-select-bar {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    bottom: 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.45rem 0.6rem;
    display: none;
    align-items: center;
    gap: 0.6rem;
    z-index: 12000;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.multi-select-bar.visible {
    display: flex;
}

.multi-select-count {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-primary);
}

.multi-select-cancel {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.25rem 0.55rem;
    border-radius: 8px;
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
}

.multi-select-cancel:hover {
    border-color: var(--accent);
    color: var(--accent);
}

body.selection-mode .day-header,
body.selection-mode .backlog-header {
    cursor: copy;
}


/* Week Grid */
.week-container {
    flex: 1;
    padding: 0.85rem 1.25rem;
    max-width: 1650px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    overflow: visible;
    min-height: 0;
    -webkit-overflow-scrolling: touch;
}

/* When backlog is hidden, week-grid takes full height */
.week-container.no-backlog {
    overflow: visible !important;
}

.week-container.no-backlog .week-grid {
    flex: 1;
    overflow: visible;
}

.week-container.no-backlog .day-column {
    overflow: visible;
    height: auto;
}

.week-container.no-backlog .backlog-section {
    display: none;
}

.week-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0.6rem;
    flex: 0 0 auto;
    min-height: 0;
    align-items: stretch;
}

/* Inbox View (minimal) */
.inbox-view {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    min-height: 0;
}

.inbox-header {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.85rem;
}

.inbox-title-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.inbox-title {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.inbox-count {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.inbox-create-row {
    display: flex;
    gap: 0.5rem;
}

.inbox-quick-input {
    flex: 1;
    min-width: 0;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.65rem 0.75rem;
    font-size: 0.95rem;
}

.inbox-add-btn {
    border: 1px solid var(--accent);
    background: var(--accent);
    color: #fff;
    border-radius: 8px;
    padding: 0.65rem 0.9rem;
    font-weight: 600;
}

.inbox-list {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    min-height: 0;
}

.inbox-item-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.4rem;
}

.inbox-item-wrap.inbox-structural-item {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 0 0.4rem;
}

.inbox-item-wrap .task-item {
    border: none;
    background: transparent;
    margin: 0;
    align-items: center;
}

.inbox-item-actions {
    display: flex;
    gap: 0.4rem;
    padding: 0;
    margin-left: auto;
    flex-wrap: nowrap;
    align-items: center;
    flex-shrink: 0;
}

.inbox-action-btn {
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 999px;
    padding: 0.28rem 0.62rem;
    font-size: 0.76rem;
    font-weight: 600;
    line-height: 1.2;
    white-space: nowrap;
    cursor: pointer;
}

.inbox-action-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.inbox-empty {
    border: 1px dashed var(--border);
    border-radius: 10px;
    padding: 1rem;
    color: var(--text-muted);
    text-align: center;
    background: var(--bg-card);
}

/* Day Column */
.day-column {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    overflow: visible;
    transition: all 0.3s;
    min-height: var(--day-column-min-height);
    min-width: 0;
    scroll-margin-top: 74px;
}

.day-column.today {
    border-color: var(--today-highlight);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.15);
}

.day-header {
    padding: 0.45rem 0.5rem;
    border-bottom: 1px solid var(--day-header-border);
    text-align: center;
    background: var(--day-header-bg);
    border-top-left-radius: 7px;
    border-top-right-radius: 7px;
    background-clip: padding-box;
}

.day-column.today .day-header {
    background: var(--today-highlight);
}

.day-name {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--day-header-name);
    margin-bottom: 0;
    line-height: 1.2;
}

.day-column.today .day-name {
    color: rgba(255, 255, 255, 0.85);
}

.day-date {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--day-header-date);
    line-height: 1.3;
}

.day-column.today .day-date {
    color: white;
}

/* Mobile Responsive - Splash Screen */
@media (max-width: 480px) {
    .app-loading-logo,
    .auth-loading-logo {
        width: 90%;
        max-width: 450px;
    }
}

/* Undo Toast */
.undo-toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%) translateY(16px);
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 12px 16px;
    border-radius: 10px;
    box-shadow: 0 8px 24px var(--shadow);
    z-index: 12100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    max-width: calc(100vw - 32px);
}

.undo-toast.active {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.undo-toast-message {
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.undo-toast-btn {
    background: none;
    border: none;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    padding: 4px 8px;
    flex-shrink: 0;
}

.undo-toast-btn:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .undo-toast {
        left: 16px;
        right: 16px;
        bottom: 76px;
        transform: translateY(16px);
        max-width: none;
    }

    .undo-toast.active {
        transform: translateY(0);
    }
}