* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    background: #f5f0eb;
    color: #2c2c2c;
    line-height: 1.6;
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem 0;
}

a { text-decoration: none; }
a:hover { text-decoration: underline; }

#app {
    max-width: 900px;
    width: 100%;
    flex: 1;
    position: relative;
    z-index: 1;
}

/* Footer art */
.footer-art {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    pointer-events: none;
    color: #4a4a4a;
    z-index: 0;
}

.footer-art svg {
    display: block;
    width: 100%;
    height: auto;
}

/* Site header: mirrors dcheng728.github.io (current-page label over a rule) */
.topbar {
    border-bottom: 1px solid #e5e5e5;
    margin-bottom: 1.25rem;
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    min-height: 4rem; /* same height as the main site's bar, which holds the icon links */
}

.nav-links {
    display: flex;
    gap: 1.25rem;
}

.nav-links a {
    position: relative;
    color: inherit;
}

.nav-links a:hover {
    text-decoration: none;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -0.2rem;
    height: 2px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 180ms ease;
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
    transform: scaleX(1);
}

.nav-links a.is-active {
    font-weight: 650;
}

.home-link {
    margin-left: auto;
    font-size: 0.85rem;
    color: #999;
}

/* Decorative arrow (down, then right) pointing at the link */
.home-link::before {
    content: "\21B3\00a0";
    display: inline-block;
}

/* About page text */
.prose h2 {
    font-size: 1.15rem;
    margin: 1.5rem 0 0.4rem;
}

.prose p,
.prose ul {
    margin-bottom: 0.75rem;
}

.prose ul {
    padding-left: 1.25rem;
}

/* Top bar */
.top-bar {
    margin-bottom: 1rem;
}

.top-bar h1,
.prose h1 {
    font-size: 2rem;
    color: #3a3a3a;
    margin-bottom: 0.67em;
    text-align: left;
    font-weight: bold;
}

.tagline {
    font-size: 0.95rem;
    color: #6a6a6a;
    margin-bottom: 1rem;
}

.top-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: flex-start;
}

.top-controls select {
    padding: 0.4rem 0.5rem;
    border-radius: 4px;
    border: 1px solid #ccc;
    background: white;
    color: #3a3a3a;
    font-family: inherit;
    font-size: 0.85rem;
}

.top-controls select:focus {
    outline: none;
    border-color: #8a7a6a;
}

/* Subject dropdown (multi-select checklist) */
.dropdown {
    position: relative;
}

.btn-filter {
    background: white;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 0.4rem 0.7rem;
    font-family: inherit;
    font-size: 0.85rem;
    color: #3a3a3a;
    cursor: pointer;
    white-space: nowrap;
}

.btn-filter:hover {
    border-color: #8a7a6a;
    transform: none;
}

.dropdown-panel {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 4px;
    background: white;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    z-index: 50;
    min-width: 200px;
    max-height: 320px;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.dropdown-actions {
    display: flex;
    gap: 0.75rem;
    padding: 0.25rem 0.75rem 0.5rem;
    border-bottom: 1px solid #eee;
    margin-bottom: 0.25rem;
}

.dropdown-actions a {
    font-size: 0.75rem;
}

.subject-checkbox {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.75rem;
    font-size: 0.82rem;
    color: #3a3a3a;
    cursor: pointer;
}

.subject-checkbox:hover {
    background: #f5f0eb;
}

.subject-checkbox input[type="checkbox"] {
    accent-color: #8a7a6a;
}

/* Search */
.search-container {
    position: relative;
    flex: 1;
    min-width: 160px;
}

#search-input {
    width: 100%;
    padding: 0.4rem 0.6rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.85rem;
    color: #3a3a3a;
    background: white;
}

#search-input:focus {
    outline: none;
    border-color: #8a7a6a;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: white;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    z-index: 50;
    max-height: 350px;
    overflow-y: auto;
}

.search-section-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: #999;
    padding: 0.5rem 0.75rem 0.25rem;
    letter-spacing: 0.5px;
}

.search-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    font-size: 0.82rem;
    cursor: pointer;
}

.search-item:hover {
    background: #f5f0eb;
}

.search-card-id {
    font-size: 0.7rem;
    color: #999;
    font-family: monospace;
    white-space: nowrap;
}

.search-card-preview {
    color: #3a3a3a;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-empty {
    color: #999;
    font-style: italic;
    cursor: default;
}

.search-empty:hover {
    background: transparent;
}

.btn-add-label {
    background: #d4edda;
    border: none;
    color: #2d5a3e;
    font-size: 0.75rem;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    flex-shrink: 0;
}

.btn-add-label:hover {
    background: #b8dfc4;
}

/* Label filter bar */
.label-filter-bar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
    min-height: 1.8rem;
}

.label-filter-label {
    font-size: 0.78rem;
    color: #999;
}

/* Label pills */
.label-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    padding: 0.15rem 0.55rem;
    border-radius: 20px;
    background: #e8e2db;
    color: #6a6a6a;
    white-space: nowrap;
}

.label-pill.active {
    background: #8a7a6a;
    color: white;
}

.label-pill.small {
    font-size: 0.7rem;
    padding: 0.1rem 0.45rem;
    cursor: pointer;
}

.label-pill.small:hover {
    background: #d4cfc8;
}

.pill-x {
    background: none;
    border: none;
    color: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.7;
}

.pill-x:hover {
    opacity: 1;
}

/* Counter bar + navigation */
.counter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: #888;
}

.counter-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.counter-right {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.difficulty-label {
    font-size: 0.78rem;
    color: #999;
}

/* Difficulty bars */
.difficulty-indicator {
    display: flex;
    align-items: center;
    gap: 2px;
}

.diff-bar {
    width: 5px;
    border-radius: 1px;
    background: #ddd;
}

.diff-bar { height: 12px; }

.diff-bar.active { background: #8a7a6a; }

.btn-nav {
    background: #e8e2db;
    border: 1px solid #d4cfc8;
    color: #6a6a6a;
    font-size: 1.3rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.btn-nav:hover {
    background: #d4cfc8;
    transform: none;
}

.btn-nav:disabled {
    opacity: 0.3;
    cursor: default;
}

.btn-nav:disabled:hover {
    background: #e8e2db;
}

.score {
    margin-left: auto;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    background: #e8e2db;
    color: #6a6a6a;
}

/* Familiarity indicator */
.familiarity-indicator {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    font-size: 0.7rem;
    padding: 0.15rem 0.55rem;
    border-radius: 20px;
    letter-spacing: 0.3px;
}

.familiarity-indicator:empty { display: none; }

.familiarity-indicator.fam-weak { background: #f8d7da; color: #8a3a3a; }
.familiarity-indicator.fam-shaky { background: #fff3cd; color: #7a6520; }
.familiarity-indicator.fam-decent { background: #d4e8f7; color: #2a5a7a; }
.familiarity-indicator.fam-strong { background: #d4edda; color: #2d5a3e; }

.report-link {
    position: absolute;
    right: 1rem;
    bottom: 0.6rem;
    font-size: 0.72rem;
    color: #bbb;
}

/* Question labels (on card) */
.question-labels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-bottom: 0.75rem;
}

.question-labels:empty {
    display: none;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-shuffle {
    background: #8a7a6a;
    color: white;
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
}

.btn-shuffle:hover {
    background: #7a6a5a;
}

.btn-secondary {
    background: #8a7a6a;
    color: white;
    width: 100%;
    padding: 0.9rem;
}

.btn-secondary:hover {
    background: #7a6a5a;
}

.btn-right {
    background: #4a8a6a;
    color: white;
    flex: 1;
}

.btn-right:hover {
    background: #3a7a5a;
}

.btn-unsure {
    background: #d4a84a;
    color: white;
    flex: 1;
}

.btn-unsure:hover {
    background: #c49a3a;
}

.btn-wrong {
    background: #c46a5a;
    color: white;
    flex: 1;
}

.btn-wrong:hover {
    background: #b45a4a;
}

kbd {
    display: inline-block;
    background: rgba(255,255,255,0.25);
    border-radius: 3px;
    padding: 0.1rem 0.4rem;
    font-size: 0.75rem;
    margin-left: 0.3rem;
    font-family: monospace;
}

/* Card */
.card {
    position: relative;
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 1.25rem;
    min-height: 180px;
    box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    border: 1px solid #e0dbd5;
}

.question {
    font-size: 1.15rem;
    line-height: 1.6;
    color: #2c2c2c;
}

.answer {
    margin-top: 1rem;
}

.answer hr {
    border: none;
    border-top: 1px solid #e0dbd5;
    margin-bottom: 1rem;
}

#answer-text {
    font-size: 1.1rem;
    color: #8a3a2a;
    font-weight: bold;
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.explanation {
    font-size: 0.9rem;
    color: #888;
    font-style: italic;
    line-height: 1.5;
}

.hidden {
    display: none !important;
}

/* Grade Buttons */
#grade-container {
    text-align: center;
}

#grade-container p {
    margin-bottom: 0.6rem;
    color: #888;
    font-size: 0.9rem;
}

.grade-buttons {
    display: flex;
    gap: 0.75rem;
}

/* Queue panel */
.queue-panel {
    margin-top: 1.25rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    border: 1px solid #e0dbd5;
    overflow: hidden;
}

.queue-legend {
    display: flex;
    gap: 6px;
    float: right;
    font-size: 0.72rem;
    color: #bbb;
}

/* Fixed-width columns so the header sits over the bars */
.queue-legend span,
.queue-indicators .fam-bar-wrap,
.queue-indicators .difficulty-indicator {
    width: 64px;
    justify-content: center;
    text-align: center;
}

.queue-title {
    font-size: 0.8rem;
    font-weight: normal;
    color: #999;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid #eee;
    letter-spacing: 0.3px;
    padding-right: calc(0.75rem + var(--scrollbar-width, 0px));
}

.queue-list {
    max-height: 200px;
    overflow-y: auto;
}

.queue-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    color: #666;
    cursor: pointer;
    border-bottom: 1px solid #f5f0eb;
}

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

.queue-item:hover {
    background: #f5f0eb;
}

.queue-item.current {
    background: #eae5df;
    font-weight: bold;
    color: #3a3a3a;
}

.queue-num {
    font-size: 0.7rem;
    color: #bbb;
    min-width: 1.5rem;
    text-align: right;
    font-family: monospace;
    flex-shrink: 0;
}

.queue-item.current .queue-num {
    color: #8a7a6a;
}

.queue-preview {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.queue-indicators {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    margin-left: auto;
}

/* Familiarity bar (continuous) */
.fam-bar-wrap {
    display: inline-flex;
    align-items: center;
}

.fam-bar {
    width: 28px;
    height: 5px;
    background: #eee;
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.fam-bar-empty {
    width: 28px;
    height: 5px;
    background: #eee;
    border-radius: 3px;
    display: block;
}

.fam-bar-fill {
    display: block;
    height: 100%;
    border-radius: 3px;
}

.fam-bar-fill.fam-weak { background: #c46a5a; }
.fam-bar-fill.fam-shaky { background: #d4a84a; }
.fam-bar-fill.fam-decent { background: #6a9aba; }
.fam-bar-fill.fam-strong { background: #4a8a6a; }

/* Difficulty bars (small, inline for queue) */
.queue-indicators .difficulty-indicator {
    height: 12px;
}

.queue-indicators .diff-bar {
    width: 4px;
    height: 10px;
}

.queue-more {
    color: #bbb;
    font-style: italic;
    cursor: default;
}

.queue-more:hover {
    background: transparent;
}

/* Stats bar */
.stats-bar {
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    background: white;
    border-radius: 8px;
    font-size: 0.85rem;
    color: #999;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    border: 1px solid #e0dbd5;
}

/* Info panel (collapsible) */
.info-panel {
    margin-top: 1rem;
    background: white;
    border-radius: 8px;
    font-size: 0.82rem;
    color: #666;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    border: 1px solid #e0dbd5;
}

.info-panel summary {
    padding: 0.5rem 1rem;
    cursor: pointer;
    color: #999;
    font-size: 0.78rem;
    user-select: none;
}

.info-panel summary:hover {
    color: #666;
}

.info-panel-body {
    padding: 0.5rem 1rem 1rem;
    border-top: 1px solid #eee;
    line-height: 1.6;
}

.info-panel-body ul {
    padding-left: 1.25rem;
}

.info-panel .sync-bar {
    margin: 0.5rem 0 0;
    padding: 0;
    border: none;
    box-shadow: none;
    background: none;
}

.info-panel-body p {
    margin: 0.4rem 0;
}

.info-formula {
    text-align: center;
    margin: 0.8rem 0 !important;
}

.info-table {
    margin: 0.5rem 0;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.info-table th,
.info-table td {
    padding: 0.25rem 0.8rem;
    border-bottom: 1px solid #eee;
    text-align: left;
}

.info-table th {
    color: #999;
    font-weight: normal;
}

/* Sync bar */
.sync-bar {
    margin-top: 1rem;
    margin-bottom: 2rem;
    padding: 0.6rem 1rem;
    background: white;
    border-radius: 8px;
    font-size: 0.8rem;
    color: #999;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    border: 1px solid #e0dbd5;
}

#sync-logged-in {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    flex-wrap: wrap;
}

.sync-status {
    flex: 1;
    min-width: 80px;
}

.btn-sync {
    background: #6a8a9a;
    color: white;
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
}

.btn-sync:hover {
    background: #5a7a8a;
}

.btn-sync-danger {
    background: #b08080;
}

.btn-sync-danger:hover {
    background: #a07070;
}

/* Gist modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    max-width: 440px;
    width: 90%;
    box-shadow: 0 4px 24px rgba(0,0,0,0.15);
}

.modal h2 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: #3a3a3a;
    font-weight: normal;
}

.modal p {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.modal input[type="text"] {
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.modal input[type="text"]:focus {
    outline: none;
    border-color: #6a8a9a;
}

.modal-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.modal .btn-cancel {
    background: #ddd;
    color: #555;
}

.modal .btn-cancel:hover {
    background: #ccc;
}

/* Responsive */
@media (max-width: 500px) {
    .card { padding: 1.25rem; }
    .top-controls { flex-direction: column; }
    .search-container { min-width: 100%; }
    .grade-buttons { flex-direction: column; }
    #sync-logged-in { flex-direction: column; align-items: stretch; }
    .dropdown-panel { min-width: 180px; }
}