/* ============================================================
   CrossWord — main.css
   Visual identity: Sacred Codex — ancient manuscript meets
   modern digital. Deep navy + warm parchment + gold.
   ============================================================ */

/* ── Google Fonts ────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;500;600;700&family=Crimson+Pro:ital,wght@0,300;0,400;0,600;1,300;1,400&family=Gentium+Plus:ital@0;1&display=swap');

/* ── Design Tokens ───────────────────────────────────────── */
:root {
    /* Primary palette */
    --navy:          #1B3A6B;
    --navy-deep:     #112548;
    --navy-mid:      #234f93;
    --navy-light:    #2c5fa8;

    /* Parchment / content surface */
    --parchment:     #F7F0E3;
    --parchment-mid: #EDE3CF;
    --parchment-dark:#DDD0B5;

    /* Gold accent */
    --gold:          #C9A84C;
    --gold-light:    #DEC06E;
    --gold-dark:     #A8883A;

    /* Text */
    --text-primary:  #1A1612;
    --text-secondary:#4A3F2F;
    --text-muted:    #7A6E5F;
    --text-on-navy:  #EDE3CF;
    --text-on-gold:  #1A1612;

    /* Status colors */
    --green:         #2E7D4F;
    --green-light:   #E8F5EE;
    --amber:         #B5740A;
    --amber-light:   #FEF3DC;
    --red:           #8B2020;
    --red-light:     #FDEAEA;
    --blue-accent:   #1E5FAD;
    --blue-light:    #EBF2FC;

    /* Word frequency tier colors */
    --freq-high:     #2E7D4F;   /* Top 100 — very common */
    --freq-mid:      #B5740A;   /* 101–500 — medium */
    --freq-rare:     #8B2020;   /* 500+ — rare */

    /* Surface elevation */
    --surface:       #FFFFFF;
    --surface-raised:#FDFBF7;
    --surface-panel: #F7F0E3;
    --border:        #D4C4A0;
    --border-light:  #E8DDCA;

    /* Typography */
    --font-display:  'Cinzel', 'Palatino Linotype', Georgia, serif;
    --font-body:     'Crimson Pro', Georgia, 'Times New Roman', serif;
    --font-greek:    'Gentium Plus', 'SBL Greek', 'Palatino Linotype', serif;
    --font-ui:       'Crimson Pro', Georgia, serif;
    --font-mono:     'Courier New', Courier, monospace;

    /* Spacing scale */
    --sp-xs:   4px;
    --sp-sm:   8px;
    --sp-md:   16px;
    --sp-lg:   24px;
    --sp-xl:   32px;
    --sp-2xl:  48px;
    --sp-3xl:  64px;

    /* Radii */
    --r-sm:    4px;
    --r-md:    8px;
    --r-lg:    12px;
    --r-xl:    16px;
    --r-pill:  999px;

    /* Shadows */
    --shadow-sm:   0 1px 3px rgba(26,22,18,0.12);
    --shadow-md:   0 4px 16px rgba(26,22,18,0.14);
    --shadow-lg:   0 8px 32px rgba(26,22,18,0.18);
    --shadow-xl:   0 16px 48px rgba(26,22,18,0.22);
    --shadow-inset:inset 0 1px 3px rgba(26,22,18,0.10);

    /* Transitions */
    --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Nav */
    --nav-height:       60px;
    --header-height:    56px;
    --top-safe:         env(safe-area-inset-top, 0px);
    --bottom-safe:      env(safe-area-inset-bottom, 0px);
}

/* ── Reset & Base ────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    height: 100%;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: transparent;  /* parchment provided by html::before fixed layer */
    min-height: 100%;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    /* Gradient moved to body::before pseudo-element for iOS fixed bg support */
}

/* ── Greek Text ──────────────────────────────────────────── */
.greek,
[lang="grc"],
.word-token {
    font-family: var(--font-greek);
    font-size: 1.15em;
    font-feature-settings: "kern" 1, "liga" 1;
}

/* ── Typography Scale ────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 500;
    line-height: 1.2;
    color: var(--navy);
    letter-spacing: 0.02em;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.4rem;  }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem;    }

p { margin-bottom: 0.75em; }
p:last-child { margin-bottom: 0; }

a {
    color: var(--navy-mid);
    text-decoration: none;
}
a:hover { text-decoration: underline; text-underline-offset: 2px; }

/* ── App Shell ───────────────────────────────────────────── */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100dvh;
    position: relative;
    background: var(--surface);      /* blocks manuscript showing through content */
    box-shadow: 0 0 60px rgba(0,0,0,0.35);  /* lift app off background */
}

/* ── App Header ──────────────────────────────────────────── */
#app-header {
    background: var(--navy);
    color: var(--text-on-navy);
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    /* padding-top pushes content below the notch */
    padding-top: calc(var(--top-safe) + 10px);
    padding-left: var(--sp-md);
    padding-right: var(--sp-md);
    padding-bottom: 10px;
    /* total height = 56px content + safe area */
    min-height: calc(var(--header-height) + var(--top-safe));
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(17,37,72,0.35);
}

.app-logo {
    display: flex;
    align-items: center;
    gap: var(--sp-sm);
    text-decoration: none;
    color: var(--text-on-navy);
}

.app-logo-icon {
    width: 32px;
    height: 32px;
    background: var(--gold);
    border-radius: var(--r-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-greek);
    font-size: 1.1rem;
    color: var(--navy-deep);
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.25);
}

.app-logo-text {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--parchment);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--sp-sm);
}

.header-btn {
    background: none;
    border: none;
    color: var(--text-on-navy);
    cursor: pointer;
    padding: var(--sp-sm);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    transition: opacity 0.15s, background 0.15s;
    font-size: 1.2rem;
}
.header-btn:hover { opacity: 1; background: rgba(255,255,255,0.1); }

/* ── Breadcrumb / Passage Indicator ──────────────────────── */
#passage-indicator {
    background: var(--navy-deep);
    color: rgba(237,227,207,0.85);
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 5px var(--sp-md);
    text-align: center;
    border-bottom: 1px solid rgba(201,168,76,0.2);
    min-height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-sm);
}

#passage-indicator .passage-sep {
    opacity: 0.4;
}

/* ── Main Content ────────────────────────────────────────── */
#app-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding-bottom: calc(var(--nav-height) + var(--bottom-safe));
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* ── View Panels ─────────────────────────────────────────── */
.view-panel {
    display: none;
    animation: panelFadeIn 0.25s var(--ease-out);
    min-height: calc(100dvh - var(--header-height) - var(--top-safe) - 28px - var(--nav-height) - var(--bottom-safe));
}

.view-panel.active {
    display: block;
}

@keyframes panelFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Bottom Navigation ───────────────────────────────────── */
#app-nav {
    /* No fixed height — container grows: nav-height content + safe area padding */
    /* max() ensures at least 8px below icons even on devices where safe area = 0 */
    padding-bottom: max(var(--bottom-safe), 8px);
    background: var(--navy);
    border-top: 1px solid rgba(201,168,76,0.25);
    display: flex;
    align-items: stretch;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    box-shadow: 0 -2px 16px rgba(17,37,72,0.3);
}

.nav-btn {
    flex: 1;
    height: var(--nav-height); /* explicit content height — safe area padding is on #app-nav */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    background: none;
    border: none;
    cursor: pointer;
    color: rgba(237,227,207,0.5);
    transition: color 0.2s, background 0.2s;
    padding: var(--sp-xs) var(--sp-xs);
    position: relative;
}

.nav-btn:hover {
    color: rgba(237,227,207,0.85);
    background: rgba(255,255,255,0.06);
}

.nav-btn.active {
    color: var(--gold-light);
}

.nav-btn.active::after {
    content: '';
    position: absolute;
    top: 0;
    left: 20%;
    right: 20%;
    height: 2px;
    background: var(--gold);
    border-radius: 0 0 var(--r-sm) var(--r-sm);
}

.nav-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.nav-label {
    font-family: var(--font-display);
    font-size: 0.6rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1;
}

/* ── Passage Selector ────────────────────────────────────── */
#passage-selector {
    background: var(--navy-deep);
    padding: var(--sp-sm) var(--sp-md) var(--sp-md);
    border-bottom: 1px solid rgba(201,168,76,0.2);
}

/* ── Shared field styles ─────────────────────────────────── */
.selector-select,
.selector-search {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(201,168,76,0.25);
    border-radius: var(--r-md);
    color: var(--text-on-navy);
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 10px 12px;
    transition: border-color 0.2s, background 0.2s;
    min-width: 0;
    width: 100%;
}

.selector-select {
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23C9A84C' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
    cursor: pointer;
}

.selector-select:focus,
.selector-search:focus {
    outline: none;
    border-color: var(--gold);
    background-color: rgba(255,255,255,0.12);
}

.selector-select option {
    background: var(--navy-deep);
    color: var(--text-on-navy);
}

.selector-search::placeholder { color: rgba(237,227,207,0.35); }

/* ── Go button ───────────────────────────────────────────── */
.btn-go {
    background: var(--gold);
    border: none;
    border-radius: var(--r-md);
    color: var(--navy-deep);
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 10px 16px;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-go:hover  { background: var(--gold-light); }
.btn-go:active { transform: scale(0.97); }

/* ── Selector grid ───────────────────────────────────────── */
/*
   Mobile (< 480px):
     Row 1: [    Book (full width)    ]
     Row 2: [ Ch ] [ Vs ] [ Go ]

   Desktop (≥ 480px):
     Row 1: [ Book (3fr) ] [ Ch (1fr) ] [ Vs (1fr) ] [ Go ]

   CSS grid with named areas handles both with no JS changes.
*/
.selector-grid {
    display: grid;
    gap: var(--sp-xs);
    margin-bottom: var(--sp-xs);

    /* Mobile: 2 equal columns + auto Go button */
    grid-template-columns: 1fr 1fr auto;
    grid-template-areas:
        "book  book  book"
        "ch    vs    go";
}

.sg-book    { grid-area: book; }
.sg-chapter { grid-area: ch;   }
.sg-verse   { grid-area: vs;   }
.sg-go      { grid-area: go;   align-self: stretch; }

/* Desktop: single row */
@media (min-width: 480px) {
    .selector-grid {
        grid-template-columns: 3fr 1fr 1fr auto;
        grid-template-areas: "book ch vs go";
    }
}

/* Search row */
.selector-search-row {
    display: flex;
    gap: var(--sp-xs);
}

.selector-search { flex: 1; }

/* ── Greek Text Passage Display ──────────────────────────── */
#text-display {
    padding: var(--sp-lg) var(--sp-md);
    max-width: 680px;
    margin: 0 auto;
}

.verse-block {
    display: flex;
    gap: var(--sp-md);
    margin-bottom: var(--sp-lg);
    position: relative;
}

.verse-number {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--gold-dark);
    letter-spacing: 0.06em;
    min-width: 28px;
    text-align: right;
    padding-top: 4px;
    flex-shrink: 0;
}

.verse-actions {
    display: flex;
    flex-direction: column;
    gap: var(--sp-xs);
    flex-shrink: 0;
}

.verse-action-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--border);
    font-size: 0.9rem;
    padding: 2px;
    transition: color 0.2s;
    line-height: 1;
}

.verse-action-btn:hover { color: var(--gold); }
.verse-action-btn.active { color: var(--gold); }

.verse-text {
    font-family: var(--font-greek);
    font-size: 1.25rem;
    line-height: 2;
    color: var(--text-primary);
    flex: 1;
    letter-spacing: 0.01em;
}

/* Word tokens — tappable */
.word-token {
    display: inline;
    cursor: pointer;
    border-radius: 3px;
    padding: 1px 2px;
    transition: background 0.15s, color 0.15s;
    position: relative;
}

.word-token:hover,
.word-token.hovered {
    background: rgba(201,168,76,0.2);
    color: var(--navy);
}

.word-token.selected {
    background: rgba(201,168,76,0.35);
    color: var(--navy-deep);
}

/* Punctuation (spaces, commas, periods) — not tappable */
.word-punct {
    display: inline;
    color: var(--text-secondary);
}

/* Frequency indicator dots */
.word-token[data-freq="high"]   { border-bottom: 2px solid var(--freq-high); }
.word-token[data-freq="mid"]    { border-bottom: 2px solid var(--freq-mid); }
.word-token[data-freq="rare"]   { border-bottom: 2px solid var(--freq-rare); }

/* ── Mini Word Popup (tap in Reader Mode) ────────────────── */
.word-popup {
    position: absolute;
    background: var(--navy);
    color: var(--text-on-navy);
    border-radius: var(--r-lg);
    padding: var(--sp-md);
    box-shadow: var(--shadow-xl);
    z-index: 200;
    min-width: 180px;
    max-width: 260px;
    animation: popupIn 0.2s var(--ease-spring);
    border: 1px solid rgba(201,168,76,0.3);
    font-family: var(--font-body);
    pointer-events: none;  /* restored on .popup-study-btn below */
}

@keyframes popupIn {
    from { opacity: 0; transform: translateY(6px) scale(0.95); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.popup-study-btn {
    pointer-events: auto !important;
}

.word-popup .popup-lemma {
    font-family: var(--font-greek);
    font-size: 1.2rem;
    color: var(--gold-light);
    display: block;
    margin-bottom: 2px;
}

.word-popup .popup-gloss {
    font-size: 0.9rem;
    color: var(--parchment);
    display: block;
    margin-bottom: 4px;
}

.word-popup .popup-pos {
    font-size: 0.75rem;
    color: rgba(237,227,207,0.6);
    font-style: italic;
}

/* ── Bottom Sheet (Word Study Panel) ─────────────────────── */
.bottom-sheet-overlay {
    position: fixed;
    inset: 0;
    background: rgba(17,37,72,0.5);
    z-index: 300;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
}

.bottom-sheet-overlay.visible {
    opacity: 1;
    pointer-events: all;
}

.bottom-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-radius: var(--r-xl) var(--r-xl) 0 0;
    z-index: 301;
    max-height: 85dvh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform 0.3s var(--ease-out);
    padding-bottom: calc(var(--nav-height) + var(--bottom-safe));
    box-shadow: 0 -4px 32px rgba(17,37,72,0.25);
}

.bottom-sheet.open {
    transform: translateY(0);
}

.sheet-handle {
    width: 40px;
    height: 4px;
    background: var(--border);
    border-radius: var(--r-pill);
    margin: var(--sp-md) auto var(--sp-sm);
}

.sheet-header {
    padding: var(--sp-sm) var(--sp-md) var(--sp-md);
    border-bottom: 1px solid var(--border-light);
}

.sheet-lemma {
    font-family: var(--font-greek);
    font-size: 1.6rem;
    color: var(--navy);
    display: block;
}

.sheet-gloss {
    font-size: 1rem;
    color: var(--text-secondary);
}

.sheet-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-light);
    padding: 0 var(--sp-md);
    gap: var(--sp-lg);
    overflow-x: auto;
}

.sheet-tab {
    padding: var(--sp-sm) 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s, border-color 0.2s;
    margin-bottom: -1px;
}

.sheet-tab.active {
    color: var(--navy);
    border-bottom-color: var(--gold);
}

.sheet-body {
    padding: var(--sp-md);
}

/* Morphology table in Word Study Panel */
.morph-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.morph-table td {
    padding: 6px var(--sp-sm);
    border-bottom: 1px solid var(--border-light);
    vertical-align: top;
}

.morph-table td:first-child {
    color: var(--text-muted);
    font-family: var(--font-display);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    width: 40%;
    padding-right: var(--sp-md);
}

.morph-table td:last-child {
    color: var(--text-primary);
    font-weight: 600;
}

/* ── Cards (shared component) ────────────────────────────── */
.card {
    background: var(--surface);
    border-radius: var(--r-lg);
    border: 1px solid var(--border-light);
    padding: var(--sp-md);
    margin-bottom: var(--sp-md);
    box-shadow: var(--shadow-sm);
}

.card-title {
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--sp-sm);
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-xs);
    padding: 10px var(--sp-lg);
    border-radius: var(--r-md);
    border: none;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
    text-decoration: none;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: var(--navy);
    color: var(--parchment);
}
.btn-primary:hover { background: var(--navy-mid); }

.btn-gold {
    background: var(--gold);
    color: var(--navy-deep);
}
.btn-gold:hover { background: var(--gold-light); }

.btn-ghost {
    background: transparent;
    color: var(--navy);
    border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--parchment-mid); }

.btn-sm {
    padding: 6px var(--sp-md);
    font-size: 0.7rem;
}

/* ── Badge / Status Pills ────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--r-pill);
    font-size: 0.65rem;
    font-family: var(--font-display);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 600;
}

.badge-new      { background: var(--blue-light);  color: var(--blue-accent); }
.badge-learning { background: var(--amber-light);  color: var(--amber); }
.badge-known    { background: var(--green-light);  color: var(--green); }
.badge-mastered { background: var(--navy);          color: var(--gold-light); }

/* ── Progress Bar ────────────────────────────────────────── */
.progress-bar {
    height: 6px;
    background: var(--border-light);
    border-radius: var(--r-pill);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--navy-mid), var(--gold));
    border-radius: var(--r-pill);
    transition: width 0.5s var(--ease-out);
}

/* ── Welcome / Empty State ───────────────────────────────── */
.empty-state {
    text-align: center;
    padding: var(--sp-3xl) var(--sp-xl);
    color: var(--text-muted);
}

.empty-state-icon {
    font-family: var(--font-greek);
    font-size: 4rem;
    color: var(--parchment-dark);
    margin-bottom: var(--sp-md);
    display: block;
    line-height: 1;
}

.empty-state h2 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--navy);
    margin-bottom: var(--sp-sm);
}

.empty-state p {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 300px;
    margin: 0 auto var(--sp-lg);
}

/* ── Loading Spinner ─────────────────────────────────────── */
.spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--navy);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

.loading-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--sp-3xl);
    gap: var(--sp-md);
    color: var(--text-muted);
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* ── Toast Notifications ─────────────────────────────────── */
#toast-container {
    position: fixed;
    bottom: calc(var(--nav-height) + var(--bottom-safe) + var(--sp-md));
    left: var(--sp-md);
    right: var(--sp-md);
    z-index: 400;
    display: flex;
    flex-direction: column;
    gap: var(--sp-sm);
    pointer-events: none;
}

.toast {
    background: var(--navy);
    color: var(--parchment);
    border-radius: var(--r-lg);
    padding: var(--sp-sm) var(--sp-md);
    font-family: var(--font-body);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(201,168,76,0.2);
    animation: toastIn 0.3s var(--ease-spring);
    display: flex;
    align-items: center;
    gap: var(--sp-sm);
}

.toast.error { border-color: rgba(139,32,32,0.5); }
.toast.success { border-color: rgba(46,125,79,0.5); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(12px) scale(0.95); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Mode-specific section styles ────────────────────────── */

/* Learn Mode panels */
.learn-section {
    border-top: 1px solid var(--border-light);
    padding: var(--sp-md);
}

.learn-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--sp-md);
}

.learn-section-title {
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--navy);
}

/* Vocab list row */
.vocab-row {
    display: flex;
    align-items: center;
    gap: var(--sp-md);
    padding: var(--sp-sm) 0;
    border-bottom: 1px solid var(--border-light);
}

.vocab-row:last-child { border-bottom: none; }

.vocab-lemma {
    font-family: var(--font-greek);
    font-size: 1.1rem;
    color: var(--navy);
    min-width: 100px;
}

.vocab-gloss {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.vocab-freq {
    font-family: var(--font-display);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

/* ── Dashboard / Progress ────────────────────────────────── */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
    padding: var(--sp-md);
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--r-lg);
    padding: var(--sp-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.75rem;
    color: var(--navy);
    font-weight: 600;
    display: block;
    line-height: 1;
    margin-bottom: var(--sp-xs);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-family: var(--font-display);
}

/* ── Flashcard ───────────────────────────────────────────── */
.flashcard {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--sp-xl);
    margin: var(--sp-md);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: transform 0.3s var(--ease-out), box-shadow 0.3s;
    transform-style: preserve-3d;
    position: relative;
}

.flashcard:hover { box-shadow: var(--shadow-lg); }

.flashcard-front,
.flashcard-back {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--sp-xl);
    backface-visibility: hidden;
    border-radius: var(--r-xl);
}

.flashcard-front { background: var(--navy); }
.flashcard-back  { background: var(--parchment); transform: rotateY(180deg); }

.flashcard.flipped { transform: rotateY(180deg); }

.flashcard-word {
    font-family: var(--font-greek);
    font-size: 2.5rem;
    color: var(--gold-light);
    margin-bottom: var(--sp-sm);
}

/* Rating buttons */
.rating-row {
    display: flex;
    gap: var(--sp-xs);
    padding: 0 var(--sp-md) var(--sp-md);
    justify-content: center;
}

.rating-btn {
    flex: 1;
    padding: 10px 4px;
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    background: var(--surface);
    font-family: var(--font-display);
    font-size: 0.6rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
    color: var(--text-secondary);
    text-align: center;
}

.rating-btn:hover { transform: translateY(-2px); }
.rating-btn[data-q="0"] { border-color: #8B2020; }
.rating-btn[data-q="3"] { border-color: #B5740A; }
.rating-btn[data-q="4"] { border-color: #2E7D4F; }
.rating-btn[data-q="5"] { border-color: #1B3A6B; background: var(--blue-light); }

/* ── Offline Banner ──────────────────────────────────────── */
#offline-banner {
    display: none;
    background: var(--amber);
    color: #3D2800;
    text-align: center;
    padding: 6px var(--sp-md);
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

body.offline #offline-banner { display: block; }

/* ── Responsive / Desktop ────────────────────────────────── */
@media (min-width: 768px) {
    #app {
        max-width: 820px;   /* comfortably readable; not full-bleed */
        margin: 0 auto;
        box-shadow: var(--shadow-xl);
        min-height: 100dvh;
        border-left: 1px solid var(--border);
        border-right: 1px solid var(--border);
    }

    /* Wider text display on desktop */
    #text-display {
        max-width: 100%;
        padding: var(--sp-lg) var(--sp-xl);
    }

    /* On desktop, Word Study Panel is a side panel */
    .bottom-sheet {
        left: auto;
        right: 0;
        top: 0;
        bottom: 0;
        width: 420px;
        max-height: 100dvh;
        border-radius: var(--r-xl) 0 0 var(--r-xl);
        transform: translateX(100%);
    }
    .bottom-sheet.open { transform: translateX(0); }
}

/* ── Wide selector layout (≥ 640px) ─────────────────────── */
/* At this width: dropdowns left, search right, gap between  */
@media (min-width: 640px) {
    .selector-outer {
        display: flex;
        gap: var(--sp-lg);
        align-items: flex-start;
    }

    /* Left side: book/ch/vs grid — fixed reasonable width */
    .selector-grid {
        flex: 0 0 auto;
        width: 360px;
        grid-template-columns: 2fr 80px 80px auto;
        grid-template-areas: "book ch vs go";
        margin-bottom: 0;
    }

    /* Right side: search stretches to fill remaining space */
    .selector-search-row {
        flex: 1;
    }
}

/* ── Accessibility ───────────────────────────────────────── */
:focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: 2px;
    border-radius: var(--r-sm);
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: dark) {
    /* Phase 1: full dark mode deferred to Phase 4+
       For now, maintain the parchment aesthetic in all modes */
}

/* ── Utility Classes ─────────────────────────────────────── */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
}

.text-center { text-align: center; }
.text-muted   { color: var(--text-muted); }
.text-greek   { font-family: var(--font-greek); }
.mt-sm  { margin-top: var(--sp-sm); }
.mt-md  { margin-top: var(--sp-md); }
.mt-lg  { margin-top: var(--sp-lg); }
.mb-md  { margin-bottom: var(--sp-md); }
.p-md   { padding: var(--sp-md); }
.flex   { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--sp-sm); }
.gap-md { gap: var(--sp-md); }
.w-full { width: 100%; }

/* ── Mini passage selector (Study/Learn empty state) ──────── */
.mini-selector .selector-select {
    background: var(--navy-deep);
    border-color: rgba(201,168,76,0.4);
    color: var(--text-on-navy);
}

.mini-selector .selector-select:disabled {
    opacity: 0.4;
}

.mini-selector .btn-go {
    background: var(--gold);
    color: var(--navy-deep);
}

/* ── Codex manuscript background (desktop only) ─────────── */
/*
   Only requested by the browser when viewport ≥ 900px.
   The image sits behind #app on either side of the max-width
   content column. Never downloaded on mobile.
*/
/* ── Fixed background system (iOS-compatible) ───────────────
   background-attachment: fixed is ignored on all iOS browsers.
   Using position:fixed pseudo-elements instead — these work on iOS.
   html::before  = parchment gradient (all screens)
   html::after   = manuscript image   (desktop ≥ 900px only)
─────────────────────────────────────────────────────────────── */

/* Parchment gradient — fixed viewport layer on all screen sizes */
html::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(201,168,76,0.07) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 70%, rgba(27,58,107,0.06) 0%, transparent 55%),
        var(--parchment);
}

/* Manuscript background image — desktop only, never downloaded on mobile */
@media (min-width: 900px) {
    html::after {
        content: '';
        position: fixed;
        inset: 0;
        z-index: -1;
        pointer-events: none;
        background-image: url('/assets/images/codex_bg.jpg');
        background-repeat: repeat-y;
        background-position: center center;
        background-size: max(100vw, 1600px) auto;
        opacity: 0.18;
    }
}