/*
 * style.css
 * Soft-Dark Gold UI Design System — based on design.json
 * Warm canvas (#DCD6C7) + dark floating cards + gold accent (#D6B15C)
 * Used by: index.php, quiz.php, cyclic_quiz.php, reader.php
 */

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

:root {
    /* Canvas */
    --canvas:    #DCD6C7;

    /* Dark surfaces */
    --sf:        #171A21;   /* raised */
    --sf2:       #1C2028;   /* raised-2 */
    --sfb:       #121419;   /* base / sunken */

    /* Text on dark */
    --t1: rgba(255,255,255,0.92);
    --t2: rgba(255,255,255,0.70);
    --t3: rgba(255,255,255,0.52);
    --t4: rgba(255,255,255,0.38);

    /* Text on canvas */
    --oc:  rgba(14,16,20,0.86);
    --oc2: rgba(14,16,20,0.50);

    /* Gold accent */
    --gold:      #D6B15C;
    --gold-bg:   rgba(214,177,92,0.14);
    --gold-glow: rgba(214,177,92,0.22);
    --gold-ring: rgba(214,177,92,0.35);

    /* Strokes */
    --stroke:  rgba(255,255,255,0.06);
    --stroke2: rgba(255,255,255,0.10);

    /* Semantic */
    --ok:     #58D49E;
    --ok-bg:  rgba(88,212,158,0.12);
    --err:    #FF5A6A;
    --err-bg: rgba(255,90,106,0.12);

    /* Shadows */
    --shadow:    0 18px 40px -18px rgba(0,0,0,0.55), 0 6px 16px -10px rgba(0,0,0,0.45);
    --shadow-sm: 0 8px 24px -10px rgba(0,0,0,0.38), 0 2px 8px -4px rgba(0,0,0,0.28);

    /* Radii */
    --r-sm:   14px;
    --r-md:   18px;
    --r-lg:   24px;
    --r-xl:   32px;
    --r-pill: 9999px;

    /* Motion */
    --ease:  cubic-bezier(0.2, 0.8, 0.2, 1);
    --ease2: cubic-bezier(0.16, 1, 0.3, 1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--canvas);
    min-height: 100vh;
    color: var(--oc);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ─── Layout ─── */
.page {
    max-width: 860px;
    margin: 0 auto;
    padding: 28px 20px 80px;
}

/* ─── Navigation bar ─── */
.nav {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 28px;
}
.nav-gap { flex: 1; }

/* ─── Icon button (pill) ─── */
.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--r-pill);
    background: var(--sf);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow-sm);
    color: var(--t3);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color .15s var(--ease), background .15s var(--ease);
    flex-shrink: 0;
    text-decoration: none;
}
.icon-btn:hover { color: var(--t1); background: var(--sf2); }

/* ─── Pill / stat tag ─── */
.pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 0 14px;
    height: 36px;
    background: var(--sf);
    border: 1px solid var(--stroke);
    border-radius: var(--r-pill);
    box-shadow: var(--shadow-sm);
    font-size: 12px;
    color: var(--t3);
    white-space: nowrap;
}
.pill strong { font-size: 13px; font-weight: 600; color: var(--t2); }
.pill.gold strong { color: var(--gold); }
.pill-lg { height: 40px; padding: 0 16px; gap: 6px; }

/* ─── Card ─── */
.card {
    background: var(--sf);
    border-radius: var(--r-xl);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
    padding: 24px;
}

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 44px;
    padding: 0 22px;
    border-radius: var(--r-pill);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all .16s var(--ease);
}
.btn-gold {
    background: var(--gold);
    color: #121419;
    box-shadow: 0 4px 20px -6px rgba(214,177,92,0.45);
}
.btn-gold:hover {
    background: #DDBA68;
    transform: translateY(-1px);
    box-shadow: 0 6px 24px -4px rgba(214,177,92,0.55);
}
.btn-ghost {
    background: rgba(255,255,255,0.06);
    color: var(--t2);
    border: 1px solid var(--stroke2);
}
.btn-ghost:hover { background: rgba(255,255,255,0.10); color: var(--t1); }

/* ─── Progress bar ─── */
.prog-track {
    height: 3px;
    background: rgba(255,255,255,0.07);
    border-radius: var(--r-pill);
    overflow: hidden;
    margin-bottom: 20px;
}
.prog-fill {
    height: 100%;
    background: var(--gold);
    border-radius: var(--r-pill);
    transition: width .4s var(--ease2);
}

/* ─── Question card ─── */
.q-card {
    background: var(--sf);
    border-radius: var(--r-xl);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
    padding: 28px;
    margin-bottom: 12px;
}
.q-meta {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--t4);
    margin-bottom: 10px;
}
.q-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--t1);
    line-height: 1.65;
    margin-bottom: 20px;
}

/* ─── Answer options ─── */
.answer {
    padding: 13px 17px;
    margin: 6px 0;
    border-radius: var(--r-lg);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--stroke);
    cursor: pointer;
    font-size: 14px;
    color: var(--t2);
    line-height: 1.55;
    transition: background .13s var(--ease), border-color .13s var(--ease), color .13s var(--ease);
}
.answer:hover { background: rgba(255,255,255,0.08); color: var(--t1); border-color: var(--stroke2); }
.answer.correct  { background: var(--ok-bg);  border-color: rgba(88,212,158,.25); color: var(--ok);  cursor: default; }
.answer.incorrect{ background: var(--err-bg); border-color: rgba(255,90,106,.20); color: var(--err); cursor: default; }
.answer.disabled { cursor: default; pointer-events: none; }

/* ─── Result text ─── */
.result-line {
    text-align: center;
    font-size: 13px;
    font-weight: 500;
    min-height: 20px;
    padding: 6px 0;
    color: transparent;
    transition: color .15s var(--ease);
}
.result-line.ok  { color: var(--ok); }
.result-line.err { color: var(--err); }

/* ─── Action row ─── */
.action-row {
    display: flex;
    justify-content: center;
    margin-top: 12px;
}

/* ─── Toggle checkbox ─── */
.toggle-lbl {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    font-size: 13px;
    color: var(--t3);
}
.toggle-lbl input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 40px;
    height: 22px;
    background: var(--sfb);
    border-radius: var(--r-pill);
    position: relative;
    cursor: pointer;
    flex-shrink: 0;
    border: 1px solid var(--stroke2);
    transition: background .18s var(--ease);
}
.toggle-lbl input[type="checkbox"]::before {
    content: '';
    position: absolute;
    width: 16px; height: 16px;
    background: var(--t4);
    border-radius: 50%;
    top: 2px; left: 2px;
    transition: transform .18s var(--ease), background .18s var(--ease);
}
.toggle-lbl input[type="checkbox"]:checked { background: var(--gold-bg); border-color: var(--gold-ring); }
.toggle-lbl input[type="checkbox"]:checked::before { transform: translateX(18px); background: var(--gold); }

/* ─── Mode choice cards ─── */
.mode-pair { display: flex; gap: 10px; margin-bottom: 22px; }
.mode-opt {
    flex: 1;
    padding: 18px;
    background: rgba(255,255,255,0.04);
    border: 1.5px solid var(--stroke);
    border-radius: var(--r-lg);
    cursor: pointer;
    text-align: left;
    transition: background .14s var(--ease), border-color .14s var(--ease);
    font-family: inherit;
}
.mode-opt:hover { background: rgba(255,255,255,0.07); border-color: var(--stroke2); }
.mode-opt.sel { border-color: var(--gold-ring); background: var(--gold-bg); }
.mode-opt-title { font-size: 14px; font-weight: 600; color: var(--t1); margin-bottom: 4px; }
.mode-opt-desc  { font-size: 12px; color: var(--t4); line-height: 1.4; }

/* ─── Overlay / modal ─── */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(18,20,25,0.76);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: opacity .22s var(--ease), visibility 0s .22s;
}
.overlay.active { opacity: 1; visibility: visible; transition: opacity .22s var(--ease); }
.overlay-card {
    background: var(--sf);
    border: 1px solid var(--stroke2);
    border-radius: var(--r-xl);
    box-shadow: 0 32px 64px -16px rgba(0,0,0,0.72);
    padding: 28px;
    width: 100%;
    max-width: 420px;
    position: relative;
    transform: scale(.95) translateY(12px);
    transition: transform .22s var(--ease2);
}
.overlay.active .overlay-card { transform: scale(1) translateY(0); }
.overlay-x {
    position: absolute;
    top: 14px; right: 14px;
    width: 30px; height: 30px;
    border-radius: var(--r-pill);
    background: rgba(255,255,255,0.05);
    border: none;
    color: var(--t3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .14s, color .14s;
}
.overlay-x:hover { background: rgba(255,255,255,0.10); color: var(--t1); }

/* Modal action buttons */
.modal-action {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 13px 15px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--stroke);
    border-radius: var(--r-lg);
    color: var(--t2);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: background .13s, color .13s;
    margin-bottom: 8px;
}
.modal-action:last-child { margin-bottom: 0; }
.modal-action:hover { background: rgba(255,255,255,0.08); color: var(--t1); }
.modal-action.featured {
    border-color: var(--gold-ring);
    background: var(--gold-bg);
    color: var(--gold);
}
.modal-action.featured:hover { background: rgba(214,177,92,0.22); }
.action-ico {
    width: 34px; height: 34px;
    border-radius: var(--r-sm);
    background: rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.modal-action.featured .action-ico { background: rgba(214,177,92,0.18); }

/* Label / heading helpers */
.lbl {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--t4);
    margin-bottom: 6px;
}
.big-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--t1);
    line-height: 1.35;
    margin-bottom: 4px;
}
.sub-text { font-size: 13px; color: var(--t4); margin-bottom: 20px; }

/* ─── Test cards (index) ─── */
.tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
}
.test-card {
    background: var(--sf);
    border-radius: var(--r-xl);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
    padding: 17px 17px 17px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.test-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 24px 48px -14px rgba(0,0,0,0.60), 0 8px 20px -8px rgba(0,0,0,0.44);
}
.test-card.qs-hide { display: none; }
.test-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    color: var(--t2);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.test-arr { color: var(--t4); flex-shrink: 0; }

/* Search bar */
.search-wrap { position: relative; margin-bottom: 22px; }
.search-ico {
    position: absolute;
    left: 15px; top: 50%;
    transform: translateY(-50%);
    color: var(--oc2);
    pointer-events: none;
    display: flex;
}
.search-inp {
    width: 100%;
    padding: 11px 16px 11px 42px;
    background: rgba(18,20,25,0.08);
    border: 1px solid rgba(18,20,25,0.14);
    border-radius: var(--r-pill);
    font-family: inherit;
    font-size: 14px;
    color: var(--oc);
    outline: none;
    transition: border-color .18s, box-shadow .18s;
}
.search-inp::placeholder { color: var(--oc2); }
.search-inp:focus { border-color: rgba(214,177,92,.45); box-shadow: 0 0 0 3px var(--gold-glow); }

/* No-results */
.no-res { grid-column: 1/-1; text-align: center; padding: 48px; font-size: 13px; color: var(--oc2); display: none; }

/* ─── Reader cards ─── */
.reader-card {
    background: var(--sf);
    border-radius: var(--r-xl);
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
    padding: 22px;
    margin-bottom: 10px;
}
.reader-q-num {
    font-size: 10px;
    font-weight: 500;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--t4);
    margin-bottom: 6px;
}
.reader-q-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--t1);
    line-height: 1.55;
    margin-bottom: 14px;
}
.reader-ans {
    padding: 9px 14px;
    margin: 4px 0;
    border-radius: var(--r-md);
    font-size: 13px;
    line-height: 1.5;
}
.reader-ans.correct   { background: var(--ok-bg);  color: var(--ok); }
.reader-ans.incorrect { background: rgba(255,255,255,0.03); color: var(--t4); }

/* ─── Completion overlay ─── */
.done-stat { font-size: 13px; color: var(--t3); margin-bottom: 8px; }
.done-stat strong { color: var(--gold); }
.done-btns { display: flex; gap: 8px; justify-content: center; margin-top: 22px; }

/* ─── Utilities ─── */
.hidden      { display: none !important; }
.auto-hidden { display: none !important; }
.text-center { text-align: center; }
.mt-3  { margin-top: 12px; }
.mt-4  { margin-top: 16px; }
.mt-6  { margin-top: 24px; }
.mb-4  { margin-bottom: 16px; }
.mb-5  { margin-bottom: 20px; }
.w-full{ width: 100%; }

@media (max-width: 520px) {
    .mode-pair { flex-direction: column; }
    .done-btns { flex-direction: column; }
    .done-btns .btn { width: 100%; }
}