:root {
    --bg: #f6f8fb;
    --surface: #ffffff;
    --surface-2: #f1f5f9;
    --text: #0f172a;
    --muted: #475569;
    --faint: #5b6b80;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --accent: #1d4ed8;
    --ring: rgba(29, 78, 216, 0.32);
    --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 10px 28px -22px rgba(15, 23, 42, 0.45);
    --shadow-hover: 0 2px 4px rgba(15, 23, 42, 0.05), 0 20px 36px -24px rgba(15, 23, 42, 0.5);
    --radius: 14px;
    --radius-sm: 10px;
    color-scheme: light;
}

[data-theme="dark"] {
    --bg: #0a0f1a;
    --surface: #111827;
    --surface-2: #0d1524;
    --text: #e5edf7;
    --muted: #a3b2c7;
    --faint: #93a4bb;
    --border: #223047;
    --border-strong: #33445f;
    --accent: #60a5fa;
    --ring: rgba(96, 165, 250, 0.35);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 30px -22px rgba(0, 0, 0, 0.9);
    --shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.45), 0 22px 40px -24px rgba(0, 0, 0, 0.95);
    color-scheme: dark;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.55;
    color: var(--text);
    background-color: var(--bg);
    background-image:
        radial-gradient(55rem 28rem at 8% -12%, rgba(29, 78, 216, 0.06), transparent 60%),
        radial-gradient(48rem 26rem at 108% -4%, rgba(13, 148, 136, 0.05), transparent 55%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

[data-theme="dark"] body {
    background-image:
        radial-gradient(55rem 28rem at 8% -12%, rgba(59, 130, 246, 0.1), transparent 60%),
        radial-gradient(48rem 26rem at 108% -4%, rgba(20, 184, 166, 0.07), transparent 55%);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 8px 28px 72px;
}

/* Skip link */
.skip-link {
    position: absolute;
    left: 16px;
    top: -100px;
    z-index: 100;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: var(--shadow);
    transition: top 0.15s ease;
}

.skip-link:focus {
    top: 16px;
}

:focus-visible {
    outline: 3px solid var(--ring);
    outline-offset: 2px;
    border-radius: 6px;
}

/* Nav / tema */
.top-nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 10px 0 4px;
}

.theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.theme-toggle-btn:hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--ring);
}

.theme-toggle-btn:active {
    transform: scale(0.96);
}

.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
}

.sun-icon { display: none; }
.moon-icon { display: block; }

[data-theme="dark"] .sun-icon { display: block; color: #fbbf24; }
[data-theme="dark"] .moon-icon { display: none; }

/* Cabeçalho */
header {
    text-align: center;
    margin: 8px auto 26px;
    max-width: 760px;
}

h1 {
    font-family: 'Outfit', 'Inter', sans-serif;
    font-size: clamp(1.8rem, 4.4vw, 2.6rem);
    font-weight: 700;
    line-height: 1.12;
    letter-spacing: -0.025em;
    margin: 0 0 12px;
    color: var(--text);
    text-wrap: balance;
}

.subtitle {
    max-width: 620px;
    margin: 0 auto;
    color: var(--muted);
    font-size: clamp(0.95rem, 2.4vw, 1.08rem);
    text-wrap: balance;
}

.stats {
    margin: 12px 0 0;
    color: var(--faint);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Botões e campos */
input,
select,
button {
    font: inherit;
}

.toolbar {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

@media (min-width: 820px) {
    .toolbar {
        grid-template-columns: 1.7fr 1fr 1fr;
        align-items: end;
        padding: 20px;
    }
}

.field {
    display: flex;
    flex-direction: column;
    gap: 7px;
    min-width: 0;
}

.field label {
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}

.search-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.search-wrap .search-icon {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 18px;
    color: var(--faint);
    pointer-events: none;
}

.input,
.select {
    width: 100%;
    height: 46px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--surface);
    color: var(--text);
    font-size: 1rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.input {
    padding: 0 44px 0 42px;
    font-weight: 500;
}

.input::placeholder {
    color: var(--faint);
    opacity: 1;
    font-weight: 400;
}

.input:hover,
.select:hover {
    border-color: var(--border-strong);
}

.input:focus,
.select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--ring);
}

.select {
    appearance: none;
    padding: 0 40px 0 14px;
    font-weight: 500;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%237c8ba1'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 17px;
    text-overflow: ellipsis;
}

.kbd-hint {
    position: absolute;
    right: 12px;
    padding: 2px 7px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface-2);
    color: var(--faint);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.72rem;
    font-weight: 600;
    pointer-events: none;
    transition: opacity 0.12s ease;
}

.input:focus ~ .kbd-hint {
    opacity: 0;
}

.clear-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 16px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: transparent;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.clear-btn:hover {
    color: var(--text);
    border-color: var(--border-strong);
    background: var(--surface-2);
}

/* Contagem + grade */
.list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin: 26px 2px 14px;
}

.result-count {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 500;
}

.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 1060px) {
    .grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Cards */
.slide-card {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "info" "thumb" "actions";
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.slide-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 3px;
    background: var(--accent-card-gradient);
}

.slide-card:hover {
    transform: translateY(-2px);
    border-color: rgba(var(--accent-card-rgb), 0.45);
    box-shadow: var(--shadow-hover);
}

@media (min-width: 560px) {
    .slide-card {
        grid-template-columns: minmax(0, 1fr) 208px;
        grid-template-areas:
            "info thumb"
            "actions thumb";
        gap: 10px 20px;
        align-items: start;
        padding: 20px;
    }
}

.slide-info {
    grid-area: info;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0;
}

.slide-badges {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    min-width: 0;
    flex-wrap: wrap;
}

.class-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border: 1px solid rgba(var(--accent-card-rgb), 0.22);
    border-radius: 999px;
    background: rgba(var(--accent-card-rgb), 0.1);
    color: rgb(var(--accent-card-rgb));
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    white-space: nowrap;
}

[data-theme="dark"] .class-badge {
    background: rgba(var(--accent-card-rgb), 0.18);
    border-color: rgba(var(--accent-card-rgb), 0.32);
    color: #ffffff;
}

.chapter-label {
    min-width: 0;
    padding-top: 4px;
    color: var(--muted);
    font-size: 0.76rem;
    font-weight: 500;
    line-height: 1.4;
    overflow-wrap: break-word;
}

.slide-title {
    margin: 0;
    font-family: 'Outfit', 'Inter', sans-serif;
    font-size: 1.16rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--text);
    overflow-wrap: anywhere;
    transition: color 0.18s ease;
}

.slide-card:hover .slide-title {
    color: rgb(var(--accent-card-rgb));
}

[data-theme="dark"] .slide-card:hover .slide-title {
    color: rgb(var(--accent-card-rgb-dark));
}

.slide-meta {
    margin: 0;
    color: var(--faint);
    font-size: 0.8rem;
}

.slide-actions {
    grid-area: actions;
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-top: 2px;
    /* Deixa cliques no espaço vazio da linha passarem para o link do card */
    pointer-events: none;
}

.pdf-download-btn {
    pointer-events: auto;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 36px;
    padding: 0 13px;
    border: 1px solid rgba(185, 28, 28, 0.24);
    border-radius: 999px;
    background: rgba(185, 28, 28, 0.07);
    color: #b91c1c;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

[data-theme="dark"] .pdf-download-btn {
    border-color: rgba(248, 113, 113, 0.3);
    background: rgba(248, 113, 113, 0.14);
    color: #fca5a5;
}

.pdf-download-btn:hover,
.pdf-download-btn:focus-visible {
    background: #b91c1c;
    border-color: #b91c1c;
    color: #ffffff;
}

.pdf-download-btn svg {
    width: 14px;
    height: 14px;
}

.open-hint {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    color: var(--faint);
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    transition: color 0.18s ease;
}

.open-hint svg {
    width: 14px;
    height: 14px;
    transition: transform 0.18s ease;
}

.slide-card:hover .open-hint {
    color: rgb(var(--accent-card-rgb));
}

.slide-card:hover .open-hint svg {
    transform: translateX(2px);
}

[data-theme="dark"] .slide-card:hover .open-hint {
    color: rgb(var(--accent-card-rgb-dark));
}

.slide-thumbnail {
    grid-area: thumb;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
}

.slide-thumbnail img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.25s ease;
}

.slide-card:hover .slide-thumbnail img {
    transform: scale(1.03);
}

/* Overlay de clique do card (mantém os botões internos clicáveis) */
.card-main-link {
    position: absolute;
    inset: 0;
    z-index: 1;
    border-radius: var(--radius);
}

.card-main-link:focus-visible {
    outline: 3px solid var(--ring);
    outline-offset: -1px;
}

/* Estado vazio */
.empty-state {
    grid-column: 1 / -1;
    padding: 56px 24px;
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--muted);
    text-align: center;
}

.empty-state p {
    margin: 0 0 16px;
    font-size: 1rem;
}

[hidden] {
    display: none !important;
}

footer {
    margin-top: 48px;
    padding-top: 22px;
    border-top: 1px solid var(--border);
    color: var(--faint);
    font-size: 0.82rem;
    text-align: center;
}

@media (min-width: 600px) and (max-width: 819px) {
    .toolbar {
        grid-template-columns: 1fr 1fr;
    }

    .field-search {
        grid-column: 1 / -1;
    }
}

@media (max-width: 559px) {
    .pdf-download-btn {
        min-height: 44px;
        padding: 0 16px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding-left: 18px;
        padding-right: 18px;
    }

    .toolbar {
        padding: 14px;
        gap: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
    }
}

/* ==========================================================================
   Agrupamento por capítulo, ordenação e busca no conteúdo
   ========================================================================== */

.list-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.sort-control {
    display: inline-flex;
    padding: 3px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.sort-btn {
    min-height: 32px;
    padding: 0 12px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.sort-btn:hover {
    color: var(--text);
}

.sort-btn[aria-pressed="true"] {
    background: var(--text);
    color: var(--surface);
}

.chapter-heading {
    grid-column: 1 / -1;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin: 10px 2px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    scroll-margin-top: 20px;
}

.chapter-heading:first-child {
    margin-top: 0;
}

.chapter-title {
    display: flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    margin: 0;
    font-family: 'Outfit', 'Inter', sans-serif;
    font-size: 1.02rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--text);
}

.group-count {
    color: var(--faint);
    font-size: 0.78rem;
    font-weight: 500;
    white-space: nowrap;
}

.chapter-label {
    display: none;
}

body[data-sort="recent"] .chapter-label {
    display: inline;
}

.new-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 9px;
    border: 1px solid #a7f3d0;
    border-radius: 999px;
    background: #d1fae5;
    color: #065f46;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    white-space: nowrap;
}

[data-theme="dark"] .new-badge {
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.18);
    color: #6ee7b7;
}

.content-hit {
    display: inline-flex;
    align-items: center;
    padding: 4px 8px;
    border: 1px dashed var(--border-strong);
    border-radius: 999px;
    color: var(--faint);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

@media (max-width: 559px) {
    .chapter-heading {
        flex-wrap: wrap;
        gap: 4px 10px;
    }

    .chapter-title {
        font-size: 0.98rem;
    }
}

.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 18px;
    border: 1px solid var(--text);
    border-radius: 999px;
    background: var(--text);
    color: var(--surface);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.15s ease;
}

.button-link:hover {
    opacity: 0.88;
}