/* The Light Translation Bible */
:root {
    --bg: #faf8f5;
    --bg-header: #f0ede8;
    --text: #2c2420;
    --text-muted: #8a7e74;
    --accent: #8b6914;
    --accent-light: #c9a84c;
    --border: #e0dbd4;
    --verse-num: #b8a88a;
    --preset-bg: #e8e4dd;
    --preset-active-bg: #8b6914;
    --preset-active-text: #fff;
    --slider-track: #d4cfc7;
    --slider-thumb: #8b6914;
    --diff-bg: rgba(201, 168, 76, 0.15);
    --diff-border: rgba(201, 168, 76, 0.5);
    --shadow: 0 1px 3px rgba(0,0,0,0.06);
    --radius: 6px;
    --font-body: 'EB Garamond', Georgia, serif;
    --font-ui: 'Inter', system-ui, sans-serif;
    --max-width: 680px;
    --panel-width: 380px;
    --header-height: 48px;
    --transition: 0.25s ease;
}

[data-theme="dark"] {
    --bg: #1a1714;
    --bg-header: #242019;
    --text: #e0d8cc;
    --text-muted: #8a7e6e;
    --accent: #c9a84c;
    --accent-light: #8b6914;
    --border: #3a352e;
    --verse-num: #6b6050;
    --preset-bg: #2e2a24;
    --preset-active-bg: #c9a84c;
    --preset-active-text: #1a1714;
    --slider-track: #3a352e;
    --slider-thumb: #c9a84c;
    --diff-bg: rgba(201, 168, 76, 0.2);
    --diff-border: rgba(201, 168, 76, 0.6);
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

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

html {
    font-size: 18px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    transition: background var(--transition), color var(--transition);
}

/* Header */
header {
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background var(--transition);
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    font-family: var(--font-ui);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.05em;
}

.subtitle {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-muted);
    padding: 0.25rem;
    border-radius: var(--radius);
    transition: color var(--transition), background var(--transition);
}

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

#theme-toggle {
    /* no margin-left:auto here — panel-toggle handles the push-right */
}

/* Controls */
.controls {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 1.5rem 0;
}

.book-selector {
    margin-bottom: 0.75rem;
}

.book-label {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.chapter-nav {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
}

.chapter-btn {
    font-family: var(--font-ui);
    font-size: 1.5rem;
    font-weight: 700;
    width: 42px;
    height: 42px;
    line-height: 1;
    padding: 0 0 2px 0;
    border: 1.5px solid var(--border);
    border-radius: 50%;
    background: var(--preset-bg);
    color: var(--text);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    user-select: none;
    -webkit-user-select: none;
}

.chapter-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--bg);
}

.chapter-btn:active:not(:disabled) {
    transform: scale(0.92);
}

.chapter-btn:disabled {
    opacity: 0.25;
    cursor: not-allowed;
}

#book-label {
    font-size: 0.95rem;
}

/* Preset Bar */
.preset-bar {
    display: flex;
    align-items: flex-start;
    gap: 0.35rem;
    margin-bottom: 0.5rem;
}

.preset-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    flex: 1;
    max-width: 140px;
}

.preset-desc {
    font-family: var(--font-ui);
    font-size: 0.58rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.3;
    opacity: 0.6;
    transition: opacity var(--transition);
}

.preset-wrapper:hover .preset-desc,
.preset-wrapper:has(.preset-btn.active) .preset-desc {
    opacity: 1;
}

.preset-btn {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.4rem 1rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--preset-bg);
    color: var(--text);
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.02em;
}

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

.preset-btn.active {
    background: var(--preset-active-bg);
    color: var(--preset-active-text);
    border-color: var(--preset-active-bg);
}

.slider-toggle {
    margin-left: auto;
    align-self: center;
}

/* Slider Panel */
.slider-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease, opacity 0.25s ease;
    opacity: 0;
    padding: 0 0;
}

.slider-panel.open {
    max-height: 260px;
    opacity: 1;
    padding: 0.75rem 0 0.5rem;
}

.slider-group {
    margin-bottom: 0.6rem;
}

.slider-group label {
    display: grid;
    grid-template-columns: 110px 40px 1fr 55px;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-ui);
    font-size: 0.75rem;
}

.slider-label {
    color: var(--text);
    font-weight: 600;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.slider-desc {
    font-weight: 400;
    font-size: 0.58rem;
    color: var(--text-muted);
    line-height: 1.2;
}

.slider-hint {
    color: var(--text-muted);
    font-size: 0.65rem;
}

.slider-hint.left { text-align: right; }
.slider-hint.right { text-align: left; }

/* Range Slider Styling */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--slider-track);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    border: 2px solid var(--bg);
    box-shadow: var(--shadow);
    transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    border: 2px solid var(--bg);
    box-shadow: var(--shadow);
}

/* Verses */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem 1.5rem 4rem;
    font-size: 1.05rem;
}

.verse {
    margin-bottom: 0.15rem;
    display: inline;
}

.verse-num {
    font-family: var(--font-ui);
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--verse-num);
    vertical-align: super;
    margin-right: 0.15rem;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s ease;
}

.verse-num:hover {
    color: var(--accent);
}

.verse-text {
    display: inline;
    transition: opacity 0.2s ease;
}

.verse-text.updating {
    opacity: 0.4;
}

/* Diff highlighting — stays visible until next switch */
.diff-highlight {
    background: var(--diff-bg);
    border-bottom: 1.5px solid var(--diff-border);
    border-radius: 2px;
    padding: 0 1px;
    cursor: pointer;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.diff-highlight:hover {
    background: var(--diff-border);
}

.diff-highlight--active {
    background: var(--diff-border);
    border-bottom-width: 2px;
}

/* Diff tooltip */
.diff-tooltip {
    position: fixed;
    z-index: 200;
    background: var(--bg-header);
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 0.7rem;
    line-height: 1.4;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    max-width: 280px;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

.diff-tooltip[hidden] {
    opacity: 0;
    display: block;
    visibility: hidden;
}

/* Verse separator */
.verse + .verse::before {
    content: ' ';
}

/* Annotation Panel — right sidebar on desktop, bottom sheet on mobile */
.panel-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 299;
    transition: opacity 0.25s ease;
}

.panel-overlay[hidden] {
    display: block;
    opacity: 0;
    pointer-events: none;
}

/* Toggle switch — far right of header, vertically centered */
#panel-toggle {
    margin-left: auto;
    position: fixed;
    right: 1rem;
    top: 0;
    height: var(--header-height);
    z-index: 301;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
}

.toggle-switch {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--slider-track);
    border-radius: 10px;
    transition: background 0.25s ease;
    flex-shrink: 0;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
    transition: transform 0.25s ease;
}

#panel-toggle.active .toggle-switch {
    background: var(--accent);
}

#panel-toggle.active .toggle-switch::after {
    transform: translateX(16px);
}

.toggle-label {
    font-family: var(--font-ui);
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-right: 0.4rem;
    letter-spacing: 0.03em;
    transition: color var(--transition);
}

#panel-toggle.active .toggle-label {
    color: var(--accent);
}

/* Mobile: bottom sheet (default) */
.annotation-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 300;
    background: var(--bg);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.12);
    border-radius: 12px 12px 0 0;
    max-height: 55vh;
    display: flex;
    flex-direction: column;
    transform: translateY(0);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.annotation-panel[hidden] {
    display: flex;
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
}

/* Desktop: right sidebar — slides out from right edge, text stays put */
@media (min-width: 900px) {
    .annotation-panel {
        position: fixed;
        top: var(--header-height);
        right: 0;
        bottom: 0;
        left: auto;
        width: var(--panel-width);
        max-height: none;
        border-top: none;
        border-left: 1px solid var(--border);
        border-radius: 0;
        box-shadow: -4px 0 20px rgba(0,0,0,0.08);
        transform: translateX(0);
    }

    .annotation-panel[hidden] {
        transform: translateX(100%);
    }

    /* No overlay on desktop — panel occupies the right margin */
    .panel-overlay {
        display: none !important;
    }
}

.panel-header {
    display: flex;
    align-items: center;
    padding: 0.6rem 1rem 0;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.panel-tabs {
    display: flex;
    gap: 0;
    flex: 1;
}

.panel-tab {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.5rem 0.85rem;
    border: none;
    background: none;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
}

.panel-tab:hover {
    color: var(--text);
}

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

.panel-body {
    overflow-y: auto;
    padding: 1rem 1.25rem 1.5rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--text);
    overscroll-behavior: contain;
    flex: 1;
}

/* Panel content styling */
.panel-body h3 {
    font-size: 0.85rem;
    font-weight: 700;
    margin: 0 0 0.4rem;
    color: var(--text);
}

.panel-body h4 {
    font-size: 0.75rem;
    font-weight: 600;
    margin: 0.8rem 0 0.3rem;
    color: var(--accent);
}

.panel-body p {
    margin: 0 0 0.6rem;
}

.panel-greek {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
}

.panel-translit {
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.panel-morph {
    font-family: monospace;
    font-size: 0.65rem;
    color: var(--text-muted);
    background: var(--preset-bg);
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
}

.panel-gloss {
    font-weight: 600;
    color: var(--text);
}

.panel-explanation {
    margin-top: 0.4rem;
    padding-left: 0.75rem;
    border-left: 2px solid var(--accent);
    color: var(--text);
}

.panel-change-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.panel-change-old {
    text-decoration: line-through;
    color: var(--text-muted);
}

.panel-change-new {
    font-weight: 600;
    color: var(--accent);
}

.panel-cross-refs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.4rem;
}

.panel-cross-ref {
    font-size: 0.65rem;
    background: var(--preset-bg);
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    color: var(--text-muted);
    font-weight: 500;
}

.panel-section {
    margin-bottom: 1rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--border);
}

.panel-section:last-child {
    border-bottom: none;
}

.panel-commentary-source {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.2rem;
}

.panel-loading {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 0;
}

/* Tablet: constrain bottom panel width */
@media (min-width: 601px) and (max-width: 899px) {
    .annotation-panel {
        left: 50%;
        transform: translateX(-50%);
        max-width: 680px;
        width: 100%;
    }
    .annotation-panel[hidden] {
        transform: translateX(-50%) translateY(100%);
    }
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1.5rem;
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

footer .license {
    margin-top: 0.3rem;
    font-size: 0.6rem;
}

footer .license a {
    color: var(--accent);
    text-decoration: none;
}

footer .license a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 600px) {
    html { font-size: 16px; }

    .header-content { gap: 0.5rem; }
    .controls { padding: 0.75rem 1rem 0; }
    main { padding: 1rem 1rem 3rem; }

    .slider-group label {
        grid-template-columns: 90px 35px 1fr 45px;
    }

    .preset-btn {
        padding: 0.35rem 0.75rem;
        font-size: 0.75rem;
    }

    .preset-desc {
        max-width: 90px;
        font-size: 0.55rem;
    }
}

/* Print */
@media print {
    header, .controls, footer, .diff-tooltip, .annotation-panel, .panel-overlay { display: none; }
    main { max-width: 100%; padding: 1rem; }
    .verse-num { color: #999; }
    .diff-highlight { background: none; border: none; animation: none; }
}