:root {
    /* Dark Theme Defaults (WCAG AAA/AA Compliant) */
    --bg-color: #0b1120;
    --secondary-bg-color: #131d31;
    --card-bg: #1e293b;
    --card-bg-active: #27374d;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --border-subtle: #1e293b;
    --accent-color: #38bdf8;
    --accent-bg: rgba(56, 189, 248, 0.15);
    --badge-bg: #334155;
    --path-chip-bg: rgba(255, 255, 255, 0.08);
    --path-chip-text: #e2e8f0;
    --path-chip-border: rgba(255, 255, 255, 0.14);
    --input-bg: #1e293b;
    --input-text: #f8fafc;
    --input-border: #475569;
    --btn-primary-bg: #2563eb;
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #334155;
    --btn-secondary-text: #f8fafc;
    --success-text: #34d399;
    --success-bg: rgba(16, 185, 129, 0.18);
    --warning-text: #fbbf24;
    --warning-bg: rgba(245, 158, 11, 0.18);
    --danger-text: #f87171;
    --danger-bg: rgba(239, 68, 68, 0.18);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

[data-theme="light"] {
    /* Light Theme (WCAG AAA/AA Compliant) */
    --bg-color: #f1f5f9;
    --secondary-bg-color: #ffffff;
    --card-bg: #ffffff;
    --card-bg-active: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --border-subtle: #e2e8f0;
    --accent-color: #0284c7;
    --accent-bg: rgba(2, 132, 199, 0.12);
    --badge-bg: #e2e8f0;
    --path-chip-bg: #f8fafc;
    --path-chip-text: #1e293b;
    --path-chip-border: #cbd5e1;
    --input-bg: #ffffff;
    --input-text: #0f172a;
    --input-border: #94a3b8;
    --btn-primary-bg: #0284c7;
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #e2e8f0;
    --btn-secondary-text: #0f172a;
    --success-text: #059669;
    --success-bg: rgba(16, 185, 129, 0.14);
    --warning-text: #d97706;
    --warning-bg: rgba(245, 158, 11, 0.14);
    --danger-text: #dc2626;
    --danger-bg: rgba(239, 68, 68, 0.14);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 14px;
    user-select: none;
    -webkit-user-select: none;
    overflow-x: hidden;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.hidden {
    display: none !important;
}

.font-mono {
    font-family: var(--font-mono);
}

.font-bold {
    font-weight: 600;
}

.mt-3 {
    margin-top: 12px;
}

/* Unauthenticated / Desktop Screen */
#unauth-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 24px;
}

.unauth-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 24px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
}

.unauth-icon {
    display: inline-flex;
    padding: 16px;
    border-radius: 50%;
    background-color: var(--accent-bg);
    color: var(--accent-color);
    margin-bottom: 16px;
}

.unauth-card h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.unauth-desc {
    color: var(--text-muted);
    margin-bottom: 20px;
}

.unauth-box {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 24px;
    font-size: 13px;
    color: var(--text-primary);
}

.unauth-footer {
    margin-top: 24px;
    font-size: 11px;
    color: var(--text-muted);
}

/* App Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background-color: var(--secondary-bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}

.app-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.app-logo {
    font-size: 18px;
}

.app-title {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.header-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 2px;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.15s;
}

.icon-btn:active {
    background-color: var(--border-color);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
}

.badge-repo {
    background-color: var(--accent-bg);
    color: var(--accent-color);
}

.badge-ok {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.badge-fail {
    background-color: var(--danger-bg);
    color: var(--danger-text);
}

.badge-subtle {
    background-color: var(--badge-bg);
    color: var(--text-secondary);
}

.snap-id-badge {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    background-color: var(--accent-bg);
    color: var(--accent-color);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    background-color: var(--secondary-bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 0 8px;
    position: sticky;
    top: 61px;
    z-index: 40;
}

.nav-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 4px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.15s ease;
    gap: 2px;
}

.nav-tab svg {
    stroke: var(--text-muted);
}

.nav-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.nav-tab.active svg {
    stroke: var(--accent-color);
}

/* Main Container & Panes */
.app-main {
    padding: 16px;
    max-width: 768px;
    margin: 0 auto;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Pane Header */
.pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    gap: 8px;
}

.pane-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.pane-title-row h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.count-badge {
    background-color: var(--badge-bg);
    color: var(--text-secondary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.form-select {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 500;
    outline: none;
}

/* Snapshot Cards */
.snapshots-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.snap-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: transform 0.1s, border-color 0.15s, background-color 0.15s;
}

.snap-card:active {
    transform: scale(0.985);
    background-color: var(--card-bg-active);
}

.snap-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.snap-date {
    font-weight: 700;
    font-size: 14px;
    color: var(--text-primary);
}

.snap-details {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.snap-details strong {
    color: var(--text-primary);
    font-weight: 600;
}

.snap-paths {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

.path-chip {
    background-color: var(--path-chip-bg);
    border: 1px solid var(--path-chip-border);
    padding: 1px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--path-chip-text);
    font-weight: 500;
}

.snap-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--text-secondary);
}

.snap-filecount {
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.snap-totalsize {
    color: var(--text-primary);
    font-weight: 700;
    font-family: var(--font-mono);
}

/* Tree Explorer */
.tree-header {
    margin-bottom: 12px;
}

.tree-snapshot-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 10px 14px;
    margin-bottom: 10px;
}

.snap-meta-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tags-container {
    display: flex;
    gap: 4px;
    margin-top: 4px;
}

.breadcrumbs-bar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    background-color: var(--secondary-bg-color);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 13px;
    overflow-x: auto;
}

.crumb {
    color: var(--accent-color);
    font-weight: 600;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
}

.crumb:active {
    background-color: var(--border-color);
}

.crumb-sep {
    color: var(--text-muted);
}

.tree-list {
    display: flex;
    flex-direction: column;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.tree-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-subtle);
    cursor: pointer;
    transition: background-color 0.15s;
}

.tree-item:last-child {
    border-bottom: none;
}

.tree-item:active {
    background-color: var(--card-bg-active);
}

.item-left {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.item-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.item-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    font-size: 11px;
    color: var(--text-secondary);
}

.item-size {
    font-family: var(--font-mono);
    font-weight: 600;
}

/* Search Tab */
.search-box {
    margin-bottom: 14px;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    padding: 12px 36px 12px 38px;
    border-radius: 10px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
}

.search-input:focus {
    border-color: var(--accent-color);
}

.clear-btn {
    position: absolute;
    right: 12px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
}

.search-options {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--text-secondary);
    padding: 0 4px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    color: var(--text-secondary);
}

.results-info {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.search-results-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.search-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    cursor: pointer;
}

.search-item:active {
    background-color: var(--card-bg-active);
}

.search-item-path {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-color);
    word-break: break-all;
    margin-bottom: 4px;
}

.search-item-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-muted);
}

/* Diff Tab */
.diff-controls {
    padding: 16px;
    margin-bottom: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.diff-controls h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.diff-select-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.diff-select-group label {
    font-size: 12px;
    color: var(--text-secondary);
}

.diff-summary-row {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.summary-chip {
    flex: 1;
    padding: 8px;
    border-radius: 8px;
    text-align: center;
    font-size: 12px;
    font-weight: 700;
}

.chip-added {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.chip-modified {
    background-color: var(--warning-bg);
    color: var(--warning-text);
}

.chip-removed {
    background-color: var(--danger-bg);
    color: var(--danger-text);
}

.diff-filter-chips {
    display: flex;
    gap: 6px;
    margin-bottom: 12px;
    overflow-x: auto;
}

.filter-chip {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
}

.filter-chip.active {
    background-color: var(--accent-color);
    color: #ffffff;
    font-weight: 700;
    border-color: var(--accent-color);
}

.diff-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.diff-row {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    word-break: break-all;
    color: var(--text-primary);
}

.diff-row.diff-add {
    border-left: 4px solid var(--success-text);
}

.diff-row.diff-mod {
    border-left: 4px solid var(--warning-text);
}

.diff-row.diff-del {
    border-left: 4px solid var(--danger-text);
}

.diff-tag {
    font-weight: 700;
    padding: 1px 4px;
    border-radius: 3px;
}

.diff-add .diff-tag { color: var(--success-text); }
.diff-mod .diff-tag { color: var(--warning-text); }
.diff-del .diff-tag { color: var(--danger-text); }

/* Status Tab */
.status-card {
    margin-bottom: 14px;
    padding: 16px;
}

.card-header {
    margin-bottom: 12px;
}

.card-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.status-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.status-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
}

.status-label {
    color: var(--text-muted);
}

.status-val {
    color: var(--text-primary);
    font-weight: 500;
}

.status-notice {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Cards & Buttons */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.15s;
}

.btn:active {
    opacity: 0.8;
}

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

.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--border-color);
}

.btn-block {
    width: 100%;
}

/* Modals & Drawers */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    z-index: 100;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.modal-card {
    background-color: var(--secondary-bg-color);
    border-top: 1px solid var(--border-color);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    width: 100%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    padding: 20px 16px 32px 16px;
    box-shadow: 0 -10px 25px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.2s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
}

.detail-row {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: 10px;
    font-size: 13px;
}

.detail-label {
    color: var(--text-muted);
    font-size: 11px;
}

.detail-val {
    color: var(--text-primary);
    word-break: break-all;
}

.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 16px 0;
}

/* History Timeline */
.history-section h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.history-summary-text {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.timeline-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.timeline-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-primary);
}

.timeline-card.timeline-present {
    border-left: 3px solid var(--success-text);
}

.timeline-card.timeline-absent {
    border-left: 3px solid var(--danger-text);
    opacity: 0.7;
}

.timeline-time {
    font-weight: 700;
    color: var(--text-primary);
}

.timeline-meta {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
}

/* Loading & Empty States */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    color: var(--text-muted);
    gap: 12px;
}

.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.empty-state {
    text-align: center;
    padding: 40px 16px;
    color: var(--text-muted);
    font-size: 13px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #1e293b;
    border: 1px solid #475569;
    color: #f8fafc;
    padding: 10px 18px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    z-index: 200;
}