/* ── Skin variables ─────────────────────────────────────────── */
:root {
    --bg:          #0f1117;
    --bg2:         #080a0f;
    --card:        #1a1f2e;
    --card-border: #252d42;
    --text:        #e2e8f0;
    --muted:       #64748b;
    --subtle:      #94a3b8;
    --accent:      #818cf8;
    --accent2:     #38bdf8;
    --accent-btn:  #6366f1;
    --success:     #22c55e;
    --danger:      #ef4444;
    --warning:     #f59e0b;
    --glow:        rgba(129,140,248,.18);
}

[data-skin="neon"] {
    --bg:          #060d06;
    --bg2:         #020702;
    --card:        #0a160a;
    --card-border: #1a2e1a;
    --accent:      #4ade80;
    --accent2:     #86efac;
    --accent-btn:  #16a34a;
    --glow:        rgba(74,222,128,.15);
}

[data-skin="crimson"] {
    --bg:          #100608;
    --bg2:         #080305;
    --card:        #1c0b0e;
    --card-border: #32141a;
    --accent:      #f87171;
    --accent2:     #fca5a5;
    --accent-btn:  #dc2626;
    --glow:        rgba(248,113,113,.15);
}

[data-skin="ocean"] {
    --bg:          #040e14;
    --bg2:         #020a0f;
    --card:        #081a24;
    --card-border: #102d3e;
    --accent:      #2dd4bf;
    --accent2:     #67e8f9;
    --accent-btn:  #0d9488;
    --glow:        rgba(45,212,191,.15);
}

[data-skin="amber"] {
    --bg:          #0f0b04;
    --bg2:         #080602;
    --card:        #1c1408;
    --card-border: #2e2010;
    --accent:      #fbbf24;
    --accent2:     #fde68a;
    --accent-btn:  #d97706;
    --glow:        rgba(251,191,36,.15);
}

[data-skin="caveman"] {
    --bg:          #1c1008;
    --bg2:         #100a03;
    --card:        #2a1a0a;
    --card-border: #5a3518;
    --text:        #f2d898;
    --muted:       #9c7040;
    --subtle:      #c49060;
    --accent:      #e8732a;
    --accent2:     #f0b040;
    --accent-btn:  #c05515;
    --success:     #6a9e3a;
    --danger:      #cc2200;
    --warning:     #e09020;
    --glow:        rgba(232,115,42,.35);
}

[data-skin="caveman"] body {
    font-family: 'Georgia', 'Times New Roman', serif;
    background-image:
        radial-gradient(ellipse 90% 60% at 15% 10%, rgba(120,60,10,.5), transparent),
        radial-gradient(ellipse 70% 50% at 85% 90%, rgba(80,35,5,.6), transparent),
        radial-gradient(ellipse 50% 70% at 60% 40%, rgba(50,25,3,.3), transparent),
        radial-gradient(ellipse 60% 40% at 50% -10%, var(--glow), transparent),
        radial-gradient(ellipse 40% 30% at 80% 110%, var(--glow), transparent);
}

[data-skin="caveman"] .card {
    border-radius: 3px;
    box-shadow: 4px 4px 0 rgba(0,0,0,.6), inset 0 0 40px rgba(0,0,0,.35);
}

[data-skin="caveman"] h1,
[data-skin="caveman"] h2,
[data-skin="caveman"] h3 {
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

[data-skin="caveman"] .btn {
    border-radius: 2px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-family: 'Georgia', serif;
    font-weight: bold;
}

[data-skin="caveman"] .logo-name {
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

[data-skin="caveman"] input,
[data-skin="caveman"] select,
[data-skin="caveman"] textarea {
    border-radius: 2px;
    font-family: 'Georgia', serif;
}

/* Cave drawings layer */
#cave-drawings {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

[data-skin="caveman"] .container {
    position: relative;
    z-index: 1;
}

[data-skin="caveman"] #skin-toggle,
[data-skin="caveman"] #skin-panel {
    z-index: 101;
}

/* ── Reset & base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    overflow-x: hidden;
    touch-action: pan-y;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 60% 40% at 50% -10%, var(--glow), transparent),
        radial-gradient(ellipse 40% 30% at 80% 110%, var(--glow), transparent);
    color: var(--text);
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.75rem 1rem 4rem;
    overflow-x: hidden;
    touch-action: pan-y;
}

.container {
    width: 100%;
    max-width: 800px;
}

/* ── Header / logo ──────────────────────────────────────────── */
header {
    text-align: center;
    margin-bottom: 2rem;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.logo-wrap {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    cursor: pointer;
}

.logo-svg {
    width: 72px;
    height: 72px;
    filter: drop-shadow(0 0 18px var(--accent));
    transition: filter 0.3s, transform 0.3s;
}

.logo-wrap:hover .logo-svg {
    filter: drop-shadow(0 0 28px var(--accent));
    transform: scale(1.06);
}

.logo-name {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-tagline {
    color: var(--muted);
    font-size: 0.85rem;
    letter-spacing: 0.03em;
    margin-top: -0.25rem;
}

/* ── Cards ──────────────────────────────────────────────────── */
.card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 24px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.04);
    transition: border-color 0.3s;
}

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

h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text);
}

/* ── Forms ──────────────────────────────────────────────────── */
label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--subtle);
    margin-bottom: 0.4rem;
}

/* Answer labels override — preserve original casing */
.answer-list li label {
    text-transform: none;
    letter-spacing: normal;
}

select, input[type="text"], input[type="number"], input[type="password"], textarea {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: var(--bg2);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text);
    font-size: 1rem;
    margin-bottom: 1.1rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

select:focus, input:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--glow);
}

textarea { resize: vertical; min-height: 80px; }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s, box-shadow 0.2s;
    text-decoration: none;
    letter-spacing: 0.02em;
    font-family: inherit;
}

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

.btn-primary {
    background: var(--accent-btn);
    color: #fff;
    box-shadow: 0 2px 12px var(--glow);
}
.btn-primary:hover { opacity: 0.88; box-shadow: 0 4px 20px var(--glow); }

.btn-success { background: #16a34a; color: #fff; }
.btn-success:hover { opacity: 0.88; }

.btn-danger  { background: #dc2626; color: #fff; }
.btn-danger:hover { opacity: 0.88; }

.btn-muted   { background: var(--card-border); color: var(--subtle); }
.btn-muted:hover { opacity: 0.88; }

.btn-outline { background: transparent; border: 1.5px solid var(--accent); color: var(--accent); }
.btn-outline:hover { background: var(--accent); color: #000; opacity: 1; }

/* ── Alerts ─────────────────────────────────────────────────── */
.alert {
    padding: 0.8rem 1rem;
    border-radius: 10px;
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
    border-left: 4px solid;
}

.alert-success { background: #052e16; border-color: var(--success); color: #86efac; }
.alert-error   { background: #1c0606; border-color: var(--danger);  color: #fca5a5; }
.alert-info    { background: #080e1c; border-color: var(--accent);  color: var(--accent2); }

/* ── Progress bar ───────────────────────────────────────────── */
.progress-wrap {
    margin-bottom: 1.75rem;
}

.progress-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--muted);
    margin-bottom: 0.4rem;
}

.progress-bar-wrap {
    background: var(--bg2);
    border-radius: 999px;
    height: 6px;
    overflow: hidden;
}

.progress-bar-bg {
    background: var(--bg2);
    border-radius: 999px;
    height: 6px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    transition: width 0.5s cubic-bezier(.4,0,.2,1);
    box-shadow: 0 0 8px var(--glow);
}

/* ── Nav / footer ───────────────────────────────────────────── */
nav { text-align: center; margin-top: 1.5rem; }
nav a { color: var(--accent); text-decoration: none; font-size: 0.9rem; cursor: pointer; }
nav a:hover { text-decoration: underline; }

footer {
    margin-top: 3.5rem;
    color: var(--muted);
    font-size: 0.75rem;
    text-align: center;
    opacity: 0.6;
}

/* ── Logo animations ────────────────────────────────────────── */
@keyframes brain-breathe {
    0%, 100% { filter: drop-shadow(0 0 16px var(--accent)); }
    50%       { filter: drop-shadow(0 0 34px var(--accent)); transform: scale(1.05); }
}
@keyframes brain-home-pulse {
    0%, 100% { filter: drop-shadow(0 0 10px var(--accent)); transform: scale(1); }
    50%       { filter: drop-shadow(0 0 38px var(--accent)) drop-shadow(0 0 16px var(--accent2)); transform: scale(1.10); }
}

.logo-svg.breathing { animation: brain-breathe 3.5s ease-in-out infinite; }
body.on-home .logo-svg:not(.breathing) { animation: brain-home-pulse 2.8s ease-in-out infinite; }




/* ── Skin switcher ──────────────────────────────────────────── */
#skin-toggle {
    position: fixed;
    top: 1.1rem;
    right: 1.1rem;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--card);
    border: 1px solid var(--card-border);
    color: var(--accent);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 12px rgba(0,0,0,.4);
    transition: border-color 0.2s, transform 0.2s;
    z-index: 100;
}
#skin-toggle:hover { border-color: var(--accent); transform: scale(1.08); }

#skin-panel {
    position: fixed;
    top: 4rem;
    right: 1.1rem;
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 0.9rem 1rem;
    box-shadow: 0 8px 32px rgba(0,0,0,.5);
    z-index: 99;
    display: none;
    flex-direction: column;
    gap: 0.6rem;
    min-width: 150px;
}

#skin-panel.open { display: flex; }

.skin-panel-title {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.2rem;
}

.skin-opt {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    padding: 0.35rem 0.5rem;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--subtle);
    transition: background 0.15s, color 0.15s;
    user-select: none;
}

.skin-opt:hover, .skin-opt.active { background: var(--bg2); color: var(--text); }

.skin-swatch {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 2px solid rgba(255,255,255,.15);
}

/* ── Quiz-specific styles ───────────────────────────────────── */
.answer-list { list-style: none; display: flex; flex-direction: column; gap: 0.65rem; }

.answer-list li label {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 0.9rem 1.1rem;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 0;
    line-height: 1.5;
}

.answer-list li label:hover {
    border-color: var(--accent);
    background: var(--bg2);
    box-shadow: 0 0 0 3px var(--glow);
}

.answer-list li input[type="radio"] {
    margin-top: 3px;
    accent-color: var(--accent);
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.review-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(124,58,237,.25);
    color: #c4b5fd;
    border: 1px solid rgba(124,58,237,.4);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    margin-bottom: 0.9rem;
    letter-spacing: 0.04em;
}

.q-number {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 0.6rem;
}

.q-text {
    font-size: 1.05rem;
    line-height: 1.65;
    font-weight: 500;
    margin-bottom: 1.5rem;
    color: var(--text);
}

/* ── Feedback styles ────────────────────────────────────────── */
.result-icon {
    font-size: 2.8rem;
    text-align: center;
    margin-bottom: 0.5rem;
    line-height: 1;
}

.result-heading {
    text-align: center;
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
}

.answer-box {
    padding: 0.8rem 1rem;
    border-radius: 10px;
    margin-bottom: 0.75rem;
    font-size: 0.92rem;
    border-left: 4px solid;
}

.answer-correct { background: #052e16; border-color: #22c55e; color: #86efac; }
.answer-wrong   { background: #1c0606; border-color: #ef4444; color: #fca5a5; }

.meta {
    font-size: 0.8rem;
    color: var(--muted);
    margin-top: 0.75rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    letter-spacing: 0.04em;
}

.badge-review { background: rgba(124,58,237,.25); color: #c4b5fd; border: 1px solid rgba(124,58,237,.4); }
.badge-slow   { background: rgba(180,83,9,.25);   color: #fde68a; border: 1px solid rgba(180,83,9,.4); }

.next-btn-wrap { text-align: center; margin-top: 1.5rem; }

/* ── Results styles ─────────────────────────────────────────── */
.score-ring-wrap {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto 1.5rem;
    filter: drop-shadow(0 0 18px var(--glow));
}

.score-ring-wrap svg { transform: rotate(-90deg); width: 100%; height: 100%; }

.score-ring-bg { fill: none; stroke: var(--card-border); stroke-width: 10; }

.score-ring-fill {
    fill: none;
    stroke-width: 12;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.1s cubic-bezier(.4,0,.2,1);
}

/* Semantic score colours kept for the percentage text only */
.score-ring-fill.colour-green  { stroke: #22c55e; filter: drop-shadow(0 0 6px rgba(34,197,94,.6)); }
.score-ring-fill.colour-yellow { stroke: #eab308; filter: drop-shadow(0 0 6px rgba(234,179,8,.6)); }
.score-ring-fill.colour-orange { stroke: #f97316; filter: drop-shadow(0 0 6px rgba(249,115,22,.6)); }
.score-ring-fill.colour-red    { stroke: #ef4444; filter: drop-shadow(0 0 6px rgba(239,68,68,.6)); }

.score-text {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-pct {
    font-size: 2rem;
    font-weight: 900;
    line-height: 1;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Semantic tint: shift the gradient hue toward the score colour via drop-shadow on the parent */
.score-pct.colour-green  { filter: drop-shadow(0 0 8px rgba(34,197,94,.5)); }
.score-pct.colour-yellow { filter: drop-shadow(0 0 8px rgba(234,179,8,.5)); }
.score-pct.colour-orange { filter: drop-shadow(0 0 8px rgba(249,115,22,.5)); }
.score-pct.colour-red    { filter: drop-shadow(0 0 8px rgba(239,68,68,.5)); }

.score-frac { font-size: 0.75rem; color: var(--muted); margin-top: 0.15rem; }

.result-label {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.filename-chip {
    display: inline-block;
    background: var(--bg2);
    border: 1px solid var(--card-border);
    border-radius: 999px;
    padding: 0.2rem 0.75rem;
    font-size: 0.78rem;
    color: var(--muted);
    margin-bottom: 0;
}

.btn-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1.75rem;
}

.incorrect-list { list-style: none; display: flex; flex-direction: column; gap: 0.65rem; }

.incorrect-list li {
    background: var(--bg2);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 0.8rem 1rem;
    font-size: 0.88rem;
}

.incorrect-list .q-text { color: var(--text); margin-bottom: 0.4rem; line-height: 1.5; }
.incorrect-list .a-text { color: #22c55e; font-size: 0.82rem; }

/* ── Dragons lab styles ─────────────────────────────────────── */
.lab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.65rem;
    margin-top: 1rem;
}

.lab-btn {
    padding: 0.6rem 0.9rem;
    border-radius: 9px;
    border: 1px solid var(--card-border);
    background: var(--bg2);
    color: var(--text);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    text-align: left;
    transition: background .15s, border-color .15s;
}
.lab-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

.damage-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

.dmg-chip {
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--card-border);
    background: var(--bg2);
    color: var(--text);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.82rem;
    transition: background .15s;
}
.dmg-chip:hover { background: var(--accent); color: #fff; }

.ring-wrap {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto 1rem;
}
.ring-wrap svg { transform: rotate(-90deg); }

/* ── Hide pages by default ──────────────────────────────────── */
.page { display: none; }
.page.active { display: block; }

/* ── Level system ───────────────────────────────────────────────── */
#level-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin: 0.5rem 0 1.2rem;
    transition: all 0.3s;
}
#level-badge {
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: 0.05em;
    min-width: 2.5rem;
    text-align: right;
}
#xp-bar {
    flex: 1;
    height: 6px;
    background: var(--bg2);
    border-radius: 99px;
    overflow: hidden;
    border: 1px solid var(--card-border);
}
#xp-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    border-radius: 99px;
    width: 0%;
    transition: width 0.5s cubic-bezier(.4,0,.2,1);
}
#xp-label {
    font-size: 0.68rem;
    color: var(--muted);
    min-width: 5rem;
}

/* Danger state — within one wrong answer of level drop */
#level-row.level-danger #xp-bar-fill { background: linear-gradient(90deg, var(--danger), #fb923c); }
#level-row.level-danger #level-badge { color: var(--danger); animation: danger-pulse 1s ease-in-out infinite; }
#level-row.level-danger #xp-label   { color: var(--danger); }
@keyframes danger-pulse { 0%,100% { opacity:1; } 50% { opacity:0.5; } }

/* Level up flash */
#level-row.level-up-flash #xp-bar-fill { background: linear-gradient(90deg, var(--success), #86efac); }
#level-row.level-up-flash #level-badge { color: var(--success); }

/* Level down overlay */
.level-down-overlay {
    position: fixed;
    inset: 0;
    background: rgba(239,68,68,0.18);
    z-index: 9996;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    animation: leveldown-fade 1.4s ease-out forwards;
}
.level-down-text {
    font-size: 2.8rem;
    font-weight: 900;
    color: #ef4444;
    text-align: center;
    text-shadow: 0 0 40px #ef4444, 0 0 80px rgba(239,68,68,0.5);
    animation: leveldown-scale 1.4s ease-out forwards;
}
@keyframes leveldown-fade { 0% { opacity:1; } 80% { opacity:1; } 100% { opacity:0; } }
@keyframes leveldown-scale { 0% { transform:scale(1.3); } 100% { transform:scale(0.9); } }

/* Screen shake */
@keyframes screen-shake {
    0%,100% { transform:translateX(0); }
    15%      { transform:translateX(-8px); }
    30%      { transform:translateX(8px); }
    45%      { transform:translateX(-6px); }
    60%      { transform:translateX(6px); }
    75%      { transform:translateX(-3px); }
    90%      { transform:translateX(3px); }
}
body.screen-shake { animation: screen-shake 0.5s ease-out; }

/* XP change in feedback */
.xp-change {
    font-size: 1.15rem;
    font-weight: 800;
    margin: 0.6rem 0 0.2rem;
    letter-spacing: 0.02em;
}
.xp-gain  { color: var(--success); }
.xp-loss  { color: var(--danger); }
.xp-warning {
    font-size: 0.82rem;
    color: var(--warning);
    margin-bottom: 0.4rem;
}

/* ── Level tier visual changes (only when XP system is active) ── */

body.xp-active [data-level-tier="1"] .logo-svg {
    filter: drop-shadow(0 0 14px var(--accent));
}

body.xp-active [data-level-tier="2"] .logo-svg {
    filter: drop-shadow(0 0 22px var(--accent)) saturate(1.2);
}
body.xp-active [data-level-tier="2"] .card {
    box-shadow: 0 2px 24px var(--glow);
}

body.xp-active [data-level-tier="3"] .logo-svg {
    filter: drop-shadow(0 0 32px var(--accent)) drop-shadow(0 0 10px var(--accent2)) saturate(1.4);
    animation: brain-xp-pulse 2.5s ease-in-out infinite;
}
body.xp-active [data-level-tier="3"] .card {
    box-shadow: 0 2px 32px var(--glow);
    border-color: color-mix(in srgb, var(--accent) 30%, var(--card-border));
}

body.xp-active [data-level-tier="4"] .logo-svg {
    filter: drop-shadow(0 0 44px var(--accent)) drop-shadow(0 0 18px var(--accent2)) saturate(1.8);
    animation: brain-xp-pulse 1.7s ease-in-out infinite;
}
body.xp-active [data-level-tier="4"] .card {
    box-shadow: 0 2px 40px var(--glow);
    border-color: color-mix(in srgb, var(--accent) 50%, var(--card-border));
}
body.xp-active [data-level-tier="4"] #xp-bar { box-shadow: 0 0 8px var(--accent); }

body.xp-active [data-level-tier="5"] .logo-svg {
    filter: drop-shadow(0 0 60px var(--accent)) drop-shadow(0 0 28px var(--accent2)) saturate(2.2) brightness(1.15);
    animation: brain-xp-pulse 1s ease-in-out infinite;
}
body.xp-active [data-level-tier="5"] .card {
    box-shadow: 0 2px 60px var(--glow);
    border-color: color-mix(in srgb, var(--accent) 70%, var(--card-border));
}
body.xp-active [data-level-tier="5"] #xp-bar { box-shadow: 0 0 14px var(--accent); }
body.xp-active [data-level-tier="5"] #level-badge { font-size: 0.82rem; text-shadow: 0 0 10px var(--accent); }

body.xp-active [data-level-tier="6"] .logo-svg {
    filter: drop-shadow(0 0 70px var(--accent)) drop-shadow(0 0 35px var(--accent2)) saturate(2.6) brightness(1.2);
    animation: brain-xp-pulse 0.85s ease-in-out infinite;
}
body.xp-active [data-level-tier="6"] .card {
    box-shadow: 0 2px 70px var(--glow);
    border-color: color-mix(in srgb, var(--accent) 80%, var(--card-border));
}
body.xp-active [data-level-tier="6"] #xp-bar { box-shadow: 0 0 18px var(--accent); }

body.xp-active [data-level-tier="7"] .logo-svg {
    filter: drop-shadow(0 0 80px var(--accent)) drop-shadow(0 0 40px var(--accent2)) saturate(3) brightness(1.25);
    animation: brain-xp-pulse 0.75s ease-in-out infinite;
}
body.xp-active [data-level-tier="7"] .card {
    box-shadow: 0 2px 80px var(--glow);
    border-color: var(--accent);
}
body.xp-active [data-level-tier="7"] #xp-bar { box-shadow: 0 0 22px var(--accent); }
body.xp-active [data-level-tier="7"] #level-badge { text-shadow: 0 0 12px var(--accent); }

body.xp-active [data-level-tier="8"] .logo-svg {
    filter: drop-shadow(0 0 90px var(--accent)) drop-shadow(0 0 50px var(--accent2)) saturate(3.5) brightness(1.3);
    animation: brain-xp-pulse 0.65s ease-in-out infinite;
}
body.xp-active [data-level-tier="8"] .card {
    box-shadow: 0 2px 90px var(--glow);
    border-color: var(--accent);
    background: color-mix(in srgb, var(--card) 92%, var(--accent));
}
body.xp-active [data-level-tier="8"] #xp-bar { box-shadow: 0 0 28px var(--accent); }
body.xp-active [data-level-tier="8"] #level-badge { text-shadow: 0 0 16px var(--accent); font-size: 0.84rem; }

body.xp-active [data-level-tier="9"] .logo-svg {
    filter: drop-shadow(0 0 100px var(--accent)) drop-shadow(0 0 60px var(--accent2)) saturate(4) brightness(1.35);
    animation: brain-xp-pulse 0.55s ease-in-out infinite;
}
body.xp-active [data-level-tier="9"] .card {
    box-shadow: 0 2px 100px var(--glow);
    border-color: var(--accent);
    background: color-mix(in srgb, var(--card) 88%, var(--accent));
}
body.xp-active [data-level-tier="9"] #xp-bar { box-shadow: 0 0 34px var(--accent); }
body.xp-active [data-level-tier="9"] #level-badge { text-shadow: 0 0 20px var(--accent); font-weight: 900; }

body.xp-active [data-level-tier="10"] .logo-svg {
    filter: drop-shadow(0 0 120px var(--accent)) drop-shadow(0 0 70px var(--accent2)) drop-shadow(0 0 30px white) saturate(4.5) brightness(1.45);
    animation: brain-xp-pulse-max 0.45s ease-in-out infinite;
}
body.xp-active [data-level-tier="10"] .card {
    box-shadow: 0 0 120px var(--glow);
    border-color: var(--accent);
    background: color-mix(in srgb, var(--card) 84%, var(--accent));
}
body.xp-active [data-level-tier="10"] #xp-bar { box-shadow: 0 0 40px var(--accent); }
body.xp-active [data-level-tier="10"] #level-badge {
    text-shadow: 0 0 24px var(--accent), 0 0 8px white;
    font-size: 0.88rem; font-weight: 900;
}

@keyframes brain-xp-pulse {
    0%, 100% { filter: drop-shadow(0 0 14px var(--accent)) saturate(1.3); }
    50%       { filter: drop-shadow(0 0 44px var(--accent)) drop-shadow(0 0 22px var(--accent2)) saturate(2.5) brightness(1.1); }
}
@keyframes brain-xp-pulse-max {
    0%, 100% { filter: drop-shadow(0 0 60px var(--accent)) drop-shadow(0 0 30px var(--accent2)) saturate(3.5) brightness(1.3); }
    50%       { filter: drop-shadow(0 0 130px var(--accent)) drop-shadow(0 0 80px var(--accent2)) drop-shadow(0 0 40px white) saturate(5) brightness(1.6); }
}

/* ── Upload / download cards ───────────────────────────────── */
.upload-zone {
    border: 2px dashed var(--card-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    margin-bottom: 1rem;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(129,140,248,.06);
}
.upload-zone input[type="file"] { display: none; }
.upload-zone-icon { font-size: 1.8rem; margin-bottom: 0.4rem; }
.upload-zone-text { font-size: 0.85rem; color: var(--subtle); }
.upload-zone-text strong { color: var(--accent); }
.upload-zone-hint { font-size: 0.72rem; color: var(--muted); margin-top: 0.3rem; }

/* ── Question image (quiz page) ─────────────────────────── */
.question-image {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: 10px;
    border: 1px solid var(--card-border);
    display: block;
    margin: 0 auto 1.1rem;
}

/* ── Quiz Creator ───────────────────────────────────────── */
.creator-img-zone {
    margin-bottom: 0.85rem;
}
.creator-img-preview {
    position: relative;
    margin-bottom: 0.75rem;
}
.creator-img-preview img {
    max-width: 100%;
    max-height: 220px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    display: block;
    margin: 0 auto;
}
.creator-img-remove {
    position: absolute;
    top: 6px; right: 6px;
    background: rgba(0,0,0,.65);
    border: none;
    color: #fff;
    border-radius: 50%;
    width: 26px; height: 26px;
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .15s;
}
.creator-img-remove:hover { background: var(--danger); }

.creator-answer-row {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-bottom: 0.55rem;
}
.creator-answer-row input[type="text"] {
    flex: 1;
    margin-bottom: 0;
}
.creator-answer-row input[type="radio"] {
    width: 1.15rem;
    height: 1.15rem;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}
.creator-answer-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--accent);
    width: 1.1rem;
    flex-shrink: 0;
    text-align: center;
}
.creator-q-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.75rem;
    border-radius: 8px;
    background: var(--bg2);
    border: 1px solid var(--card-border);
    margin-bottom: 0.4rem;
    transition: border-color .15s;
}
.creator-q-item.editing {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 6%, var(--bg2));
}
.creator-q-num {
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--accent);
    min-width: 1.5rem;
    text-align: right;
    flex-shrink: 0;
}
.creator-q-preview {
    flex: 1;
    font-size: 0.83rem;
    color: var(--subtle);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.creator-img-badge { font-size: 0.78rem; }
.creator-q-actions { display: flex; gap: 0.3rem; flex-shrink: 0; }
.creator-btn-icon {
    background: none;
    border: 1px solid var(--card-border);
    color: var(--subtle);
    border-radius: 6px;
    padding: 0.22rem 0.48rem;
    cursor: pointer;
    font-size: 0.82rem;
    transition: border-color .15s, color .15s;
    line-height: 1;
}
.creator-btn-icon:hover { border-color: var(--accent); color: var(--accent); }
.creator-btn-icon.danger:hover { border-color: var(--danger); color: var(--danger); }
.creator-empty {
    color: var(--muted);
    font-size: 0.85rem;
    text-align: center;
    padding: 1rem 0;
}

/* ── Decrypt prompt ─────────────────────────────────────── */
.decrypt-prompt {
    margin-top: 0.85rem;
    padding: 1rem 1.1rem;
    background: var(--bg2);
    border: 1px solid var(--accent);
    border-radius: 12px;
    box-shadow: 0 0 14px var(--glow);
}
.decrypt-prompt-title {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 0.65rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.decrypt-prompt input[type="password"] { margin-bottom: 0.65rem; }

.home-btn-row {
    display: flex;
    gap: 0.65rem;
    flex-wrap: wrap;
}
.home-btn-row .btn { flex: 1; min-width: 140px; text-align: center; }

/* ── Mobile responsive ─────────────────────────────────────── */
@media (max-width: 600px) {
    body { padding: 1.25rem 0.65rem 3rem; }
    header { margin-bottom: 1.5rem; }
    .logo-name { font-size: 1.5rem; }
    .logo-svg { width: 56px; height: 56px; }
    .card { padding: 1.1rem; border-radius: 12px; }
    h2 { font-size: 1.05rem; }
    .btn { padding: 0.6rem 1.1rem; font-size: 0.85rem; }
    .btn-row { gap: 0.5rem; }
    .btn-row .btn { flex: 1; min-width: 0; text-align: center; }
    .answer-list { gap: 0.45rem; }
    .answer-list li label { padding: 0.65rem 0.85rem; font-size: 0.88rem; gap: 0.65rem; }
    .q-text { font-size: 0.92rem; line-height: 1.5; margin-bottom: 1rem; }
    .q-number { margin-bottom: 0.35rem; }
    .progress-wrap { margin-bottom: 1rem; }
    .score-ring-wrap { width: 140px; height: 140px; }
    .score-ring-wrap svg { width: 140px; height: 140px; }
    .score-pct { font-size: 1.5rem; }
    .lab-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 0.5rem; }
    .damage-row { gap: 0.35rem; }
    .dmg-chip { padding: 0.3rem 0.6rem; font-size: 0.75rem; }
    #skin-toggle { width: 34px; height: 34px; top: 0.7rem; right: 0.7rem; font-size: 1rem; }
    #skin-panel { top: 3.2rem; right: 0.7rem; }
    .upload-zone { padding: 1rem; }
    .home-btn-row { flex-direction: column; }
    .home-btn-row .btn { min-width: 0; }
}

/* ── Compact header during quiz/feedback (all screen sizes) ── */
body.quiz-mode { padding-top: 0.75rem; }

body.quiz-mode header {
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    text-align: left;
}

body.quiz-mode .logo-wrap {
    flex-direction: row;
    align-items: center;
    gap: 0.55rem;
}

body.quiz-mode .logo-svg {
    width: 38px;
    height: 38px;
}

body.quiz-mode .logo-name { font-size: 1.1rem; }

body.quiz-mode .logo-tagline { display: none; }


/* ── Extra compact on mobile ────────────────────────────────── */
@media (max-width: 600px) {
    body.quiz-mode { padding-top: 0.55rem; }
    body.quiz-mode header { gap: 0.55rem; margin-bottom: 0.85rem; }
    body.quiz-mode .logo-wrap { gap: 0.45rem; }
    body.quiz-mode .logo-svg { width: 26px; height: 26px; }
    body.quiz-mode .logo-name { font-size: 0.95rem; }
}

/* ── Flashcard ───────────────────────────────────────────────────────────────── */
.fc-card-scene {
    width: 100%;
    perspective: 1000px;
    margin: 1.5rem 0;
}
.fc-card {
    width: 100%;
    min-height: 280px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.55s cubic-bezier(.4,0,.2,1);
}
.fc-card.flipped {
    transform: rotateY(180deg);
}
/* Explicitly hide front contents when flipped — belt-and-braces for browsers that mishandle backface-visibility */
.fc-card.flipped .fc-front { visibility: hidden; }
.fc-face {
    position: absolute;
    width: 100%;
    min-height: 280px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 4px 32px var(--glow);
}
.fc-back {
    transform: rotateY(180deg);
}
.fc-label {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 1rem;
}
.fc-text {
    font-size: 1.15rem;
    line-height: 1.6;
}
.fc-answer-text {
    color: var(--accent);
    font-size: 1.3rem;
    font-weight: 600;
}
.fc-btn-row {
    display: flex;
    gap: 1rem;
    margin-top: 1.75rem;
    width: 100%;
    justify-content: center;
}
#fc-progress-wrap { margin-bottom: 1rem; }