/* =======================================================
   QUIZLAB DESIGN SYSTEM (MD3 BASED)
   ======================================================= */

:root, [data-theme="dark"] {
    --bg-image-fallback: radial-gradient(circle at 15% 50%, rgba(103, 232, 249, 0.04), transparent 25%), radial-gradient(circle at 85% 30%, rgba(255, 255, 255, 0.02), transparent 25%);
    --bg-body: #070b11;
    --bg-overlay: rgba(2, 5, 10, 0.88);
    --bg-glass: rgba(8, 14, 20, 0.92);
    --bg-glass-hover: rgba(16, 24, 36, 0.95);
    --primary-50: rgba(103, 232, 249, 0.05);
    --primary-500: #67e8f9;
    --primary-600: #22d3ee;
    --primary-glow: 0 0 15px rgba(103, 232, 249, 0.2);
    --text-main: #f0f9ff;
    --text-secondary: rgba(240, 249, 255, 0.65);
    --text-inverse: #070b11;
    --text-muted: rgba(240, 249, 255, 0.35);
    --success: #4ade80;
    --success-bg: rgba(74, 222, 128, 0.12);
    --error: #f87171;
    --error-bg: rgba(248, 113, 113, 0.12);
    --warning: #fb923c;
    --border-glass: rgba(240, 249, 255, 0.08);
    --backdrop-blur: blur(12px);

    
    /* Material Design 3 Shape Scale */
    --radius-none:   0px;
    --radius-xs:     4px;
    --radius-sm:     8px;
    --radius-md:     12px;
    --radius-lg:     16px;
    --radius-xl:     24px;
    --radius-full:   999px;

    /* Elevation MD3 style */
    --elevation-1: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
    --elevation-3: 0 8px 16px rgba(0,0,0,0.4), 0 4px 8px rgba(0,0,0,0.2);

    /* Compact Design System Variables */
    --header-height: 48px;
    --header-height-mobile: 44px;
    
    --space-xs:  4px;
    --space-sm:  8px;
    --space-md:  16px;
    --space-lg:  24px;
    --space-xl:  32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Surface tones */
    --surface:           rgba(18, 18, 18, 0.98);
    --surface-container: rgba(28, 28, 28, 0.95);
    --surface-high:      rgba(40, 40, 40, 0.92);
    --on-surface-variant: rgba(255,255,255,0.6);

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --font-h1: clamp(1.5rem, 3vw, 1.75rem);
    --font-h2: clamp(1.15rem, 2.5vw, 1.35rem);
    --font-h3: clamp(0.95rem, 2vw, 1.05rem);
    --font-body: clamp(0.85rem, 1.5vw, 0.9rem);
    --font-small: 0.75rem;
    --font-tiny: 0.7rem;

    --transition-fast: 0.15s ease;
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
}

/* ── TEMA CLARO ── */
[data-theme="light"] {
    --primary-500:   #0e7490;
    --primary-600:   #155e75;
    --primary-glow:  0 0 12px rgba(14, 116, 144, 0.2);
    --primary-50:    rgba(14, 116, 144, 0.06);
    --text-main:      #0c1a22;
    --text-secondary: rgba(0, 0, 0, 0.65);
    --text-muted:     rgba(0, 0, 0, 0.42);
    --text-inverse:   #ffffff;
    --bg-glass:          rgba(255, 255, 255, 0.88);
    --bg-glass-hover:    rgba(255, 255, 255, 0.97);
    --surface:           rgba(237, 244, 248, 0.98);
    --surface-container: rgba(220, 235, 242, 0.96);
    --surface-high:      rgba(200, 220, 234, 0.94);
    --border-glass: rgba(0, 0, 0, 0.1);
    --bg-overlay: rgba(200, 220, 232, 0.80);
    --success:    #15803d;
    --success-bg: rgba(21, 128, 61, 0.10);
    --error:      #dc2626;
    --error-bg:   rgba(220, 38, 38, 0.10);
    --warning:    #c2410c;
    --elevation-1: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.05);
    --elevation-3: 0 8px 16px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
}

[data-theme="light"] body { background-color: #b8ceae; }
[data-theme="light"] .header { background: rgba(230, 242, 248, 0.97); border-bottom: 1px solid rgba(0, 0, 0, 0.06); }
[data-theme="light"] .neon-text { color: var(--primary-500); text-shadow: none; }
[data-theme="light"] .logo-abbr .q { color: var(--text-main); }
[data-theme="light"] .logo-abbr .l { color: var(--primary-500); text-shadow: none; }
[data-theme="light"] .btn-primary { color: #ffffff; box-shadow: 0 0 10px rgba(14, 116, 144, 0.18); }
[data-theme="light"] .btn-primary:hover { background: var(--primary-600); color: #ffffff; box-shadow: 0 4px 12px rgba(14, 116, 144, 0.28); }
[data-theme="light"] .btn-secondary { background: rgba(0, 0, 0, 0.05); color: var(--text-main); border-color: var(--border-glass); }
[data-theme="light"] .btn-secondary:hover { background: rgba(0, 0, 0, 0.09); }
[data-theme="light"] .btn-ghost { color: var(--text-secondary); }
[data-theme="light"] .btn-ghost:hover { color: var(--primary-500); background: rgba(14, 116, 144, 0.07); filter: none; }
[data-theme="light"] .question-text { color: var(--text-main); }
[data-theme="light"] .alternative { background: rgba(0, 0, 0, 0.02); }
[data-theme="light"] .alternative:hover:not(.disabled) { background: rgba(14, 116, 144, 0.05); }
[data-theme="light"] .modal-card { background: #ffffff; }
[data-theme="light"] .modal-overlay { background: rgba(0, 0, 0, 0.45); }
[data-theme="light"] .toast { background: #ffffff; color: var(--text-main); box-shadow: 0 10px 30px rgba(0,0,0,0.12); }
[data-theme="light"] .input-field { color: var(--text-main); background-color: rgba(255, 255, 255, 0.80); }
[data-theme="light"] .input-field::placeholder { color: var(--text-muted); }
[data-theme="light"] .feedback-message.correct { background: var(--success-bg); color: var(--success); border-color: var(--success); }
[data-theme="light"] .feedback-message.incorrect { background: var(--error-bg); color: var(--error); border-color: var(--error); }
[data-theme="light"] .badge { background: rgba(14, 116, 144, 0.08); color: var(--primary-500); border-color: rgba(14, 116, 144, 0.25); }
[data-theme="light"] .progress-track { background: rgba(0, 0, 0, 0.08); }

/* Base & Typography */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-font-smoothing: antialiased; }
html, body { max-width: 100vw; overflow-x: hidden; }

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    background-image: var(--bg-image-fallback);
    background-image: linear-gradient(var(--bg-overlay), var(--bg-overlay)), url('assets/background.jpg'), var(--bg-image-fallback);
    background-size: cover;
    background-position: center;
    background-attachment: scroll;
    color: var(--text-main);
    min-height: 100vh;
    line-height: 1.4;
    position: relative;
    padding-top: calc(var(--header-height-mobile) + var(--space-lg));
    font-size: var(--font-body);
}

body::before {
    display: none;
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }
.neon-text { color: var(--primary-500); text-shadow: var(--primary-glow); }

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    flex-direction: column;
}

.content {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding-bottom: var(--space-2xl);
    min-width: 0;
}

/* Header */
.header {
    position: fixed; left: 50%; transform: translateX(-50%); z-index: 1000;
    display: flex; align-items: center; justify-content: space-between;
    background: rgba(5, 5, 5, 0.95); backdrop-filter: var(--backdrop-blur); -webkit-backdrop-filter: var(--backdrop-blur);
    border-bottom: none; border-radius: 0; box-shadow: var(--elevation-2);
    top: 0; width: 100%; max-width: 100%; height: var(--header-height-mobile); padding: 0 var(--space-md);
    transition: all 0.3s var(--ease-out-expo);
}
.header.header-hidden { transform: translate(-50%, -100%); }

.header-brand {
    display: flex; align-items: center; gap: var(--space-sm);
    font-weight: 800; font-size: 0.95rem; color: var(--text-main); letter-spacing: -0.02em; cursor: pointer;
    line-height: 1;
}

.icon-logo { width: 20px; height: 20px; }

.logo-container { display: inline-flex; align-items: center; position: relative; height: auto; min-height: 1.2rem; font-family: var(--font-mono); }
.logo-full {
    display: inline-block; white-space: nowrap; overflow: hidden; width: 0;
    animation: typing 2s steps(7, end) forwards, blink 0.8s step-end infinite, hideFull 0.5s ease forwards 4s;
    border-right: 2px solid var(--primary-500);
}
.logo-abbr { position: absolute; left: 0; opacity: 0; display: flex; font-weight: 800; animation: showAbbr 0.5s ease forwards 4.5s; }
.logo-abbr .q { color: #ffffff; }
.logo-abbr .l { color: var(--primary-500); text-shadow: var(--primary-glow); }

@keyframes typing { from { width: 0 } to { width: 100% } }
@keyframes blink { from, to { border-color: transparent } 50% { border-color: var(--primary-500) } }
@keyframes hideFull { to { width: 0; opacity: 0; visibility: hidden; } }
@keyframes showAbbr { to { opacity: 1; } }

.header-subtitle {
    font-family: var(--font-mono); font-size: var(--font-tiny); color: var(--primary-500);
    border: 1px solid rgba(196, 255, 0, 0.3); padding: 1px 8px; border-radius: var(--radius-sm);
    background: rgba(196, 255, 0, 0.05);
}

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--space-sm);
    padding: 10px 24px; font-size: 0.8rem; font-weight: 600; border-radius: var(--radius-full);
    cursor: pointer; border: none; font-family: var(--font-sans); text-transform: uppercase;
    letter-spacing: 0.01em; white-space: nowrap; text-align: center; line-height: 1.2;
    min-height: 40px; transition: all var(--transition-fast);
    position: relative; overflow: hidden; flex-shrink: 0;
}
.btn-primary { background: var(--primary-500); color: var(--text-inverse); box-shadow: var(--primary-glow); }
.btn-primary:hover { background: #fff; transform: translateY(-1px); box-shadow: 0 4px 15px rgba(255,255,255,0.3); }

.btn-secondary { background: rgba(255, 255, 255, 0.08); color: var(--text-main); border: 1px solid var(--border-glass); }
.btn-secondary:hover { background: rgba(255, 255, 255, 0.12); border-color: var(--text-secondary); }

.btn-outline { background: transparent; border: 1px solid var(--primary-500); color: var(--primary-500); }
.btn-outline:hover { background: var(--primary-500); color: var(--text-inverse); }

.btn-ghost { background: transparent; color: var(--text-secondary); padding: var(--space-sm); display: inline-flex; align-items: center; justify-content: center; border-radius: var(--radius-md); min-height: 40px; }
.btn-ghost:hover { color: var(--primary-500); filter: drop-shadow(0 0 8px var(--primary-500)); background: rgba(255, 255, 255, 0.05); }

.header .btn {
    height: auto;
    min-height: 40px;
    min-width: 40px;
    width: auto;
    padding: 0 var(--space-sm);
}

.toggle-visibility-btn {
    min-width: 44px;
    min-height: 44px;
    width: 44px;
    height: 44px;
    padding: 0;
    flex-shrink: 0;
}

#prevBtn {
    width: 44px;
    min-width: 44px;
    padding: 0;
}

.btn:disabled { opacity: 0.5; filter: grayscale(1); cursor: not-allowed; transform: none !important; }

/* Ripple Effect */
.ripple {
    position: absolute; border-radius: 50%; transform: scale(0);
    animation: ripple 0.6s linear; background-color: rgba(255, 255, 255, 0.3);
    pointer-events: none; z-index: 0;
}
@keyframes ripple { to { transform: scale(4); opacity: 0; } }

/* Icon System */
.icon-svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; flex-shrink: 0; z-index: 1; }
.icon-xs { width: 14px; height: 14px; }
.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 32px; height: 32px; }
.icon-xl { width: 48px; height: 48px; }

.anim-bounce { animation: anim-bounce 2s infinite ease-in-out; }
@keyframes anim-bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }

/* Landing Page Components */
.hero-section { text-align: center; padding: var(--space-xl) 0; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-50);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    padding: 4px 14px;
    margin-bottom: var(--space-lg);
}
.hero-title { font-size: var(--font-h1); margin-bottom: var(--space-sm); }
.hero-desc { font-size: 0.9rem; max-width: 600px; margin: 0 auto var(--space-xl); color: var(--text-secondary); line-height: 1.6; }

.features-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-md); padding: var(--space-md) 0; }
.feature-card {
    background: var(--bg-glass); border: 1px solid var(--border-glass); padding: var(--space-md);
    border-radius: var(--radius-lg); transition: var(--transition-fast); display: flex; align-items: flex-start; gap: var(--space-md);
    box-shadow: var(--elevation-1);
}
.feature-card:hover { transform: translateY(-2px); border-color: var(--primary-500); box-shadow: var(--elevation-2); }
.feature-icon-wrapper { color: var(--primary-500); flex-shrink: 0; display: flex; align-items: center; justify-content: center; padding-top: 2px; }
.feature-card h3 { font-size: var(--font-h3); margin-bottom: var(--space-xs); color: var(--text-main); }
.feature-card p { font-size: 0.85rem; line-height: 1.4; color: var(--text-secondary); margin: 0; }

/* Upload Screen */
.upload-area {
    border: 2px dashed var(--border-glass); padding: var(--space-xl) var(--space-lg); text-align: center;
    background: var(--bg-glass); border-radius: var(--radius-lg); transition: 0.3s; position: relative; overflow: hidden;
}
.upload-area:hover { border-color: var(--primary-500); background: var(--primary-50); }
.upload-area.dragover::after {
    content: 'SOLTE O ARQUIVO AQUI'; position: absolute; inset: 0; background: rgba(5, 5, 5, 0.9);
    color: var(--primary-500); display: flex; align-items: center; justify-content: center;
    font-size: var(--font-h2); font-weight: 800; backdrop-filter: blur(4px); z-index: 10; animation: fadeIn 0.2s;
}

/* Quiz UI Components */
.quiz-info-bar {
    display: flex; align-items: center; justify-content: space-between;
    background: var(--bg-glass); border: 1px solid var(--border-glass);
    border-radius: var(--radius-md); 
    margin-bottom: var(--space-lg); transition: all 0.3s var(--ease-out-expo);
    height: auto;
    min-height: 44px;
    overflow: visible;
    padding: 0 var(--space-md);
}

.quiz-info-bar.hidden-panel {
    background: transparent;
    border-color: transparent;
    padding: 0;
    margin-bottom: var(--space-sm);
    justify-content: flex-end;
    width: 100%;
    height: 32px;
    pointer-events: none;
}

.quiz-info-bar.hidden-panel > *:not(.toggle-visibility-btn) {
    display: none !important;
}

.quiz-info-bar.hidden-panel .toggle-visibility-btn {
    pointer-events: auto;
    background: transparent;
    border: none;
    min-width: 44px;
    min-height: 44px;
    width: 44px;
    height: 44px;
}

.quiz-info-bar.hidden-panel .toggle-visibility-btn:hover {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.exam-timer-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    background: rgba(196, 255, 0, 0.05);
    border: 1px solid rgba(196, 255, 0, 0.2);
    border-radius: var(--radius-md);
    padding: 8px var(--space-md);
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.exam-timer-bar .exam-timer-value {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-500);
    letter-spacing: 0.12em;
    min-width: 52px;
    text-align: center;
}

.exam-timer-bar.timer-warning {
    border-color: rgba(255, 0, 85, 0.4);
    background: rgba(255, 0, 85, 0.05);
}

.exam-timer-bar.timer-warning .exam-timer-value {
    color: var(--error);
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

.resume-btn {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.resume-btn:hover {
    background: rgba(196, 255, 0, 0.08);
}

.score-display { display: flex; gap: var(--space-md); align-items: center; }
.score-mini {
    font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700;
    display: flex; align-items: center; gap: 4px;
}
.score-mini.correct { color: var(--success); }
.score-mini.incorrect { color: var(--error); }
.score-mini span { font-size: 0.9rem; }

/* Progress & Grid */
.progress-section { margin-bottom: var(--space-xl); }
.question-grid {
    display: flex; gap: var(--space-sm); margin-bottom: var(--space-md); overflow-x: auto;
    padding: var(--space-xs) 0 var(--space-sm); scrollbar-width: thin; scrollbar-color: var(--primary-500) transparent;
}
.question-grid::-webkit-scrollbar { height: 4px; }
.question-grid::-webkit-scrollbar-thumb { background: var(--primary-500); border-radius: 4px; }

.grid-item {
    min-width: 32px; height: 32px; border-radius: var(--radius-sm); border: 1px solid var(--border-glass);
    display: grid; place-content: center; font-size: var(--font-small); font-family: var(--font-mono); font-weight: 700;
    cursor: pointer; transition: all 0.2s; background: rgba(255, 255, 255, 0.05); color: var(--text-muted);
}
.grid-item:hover { border-color: var(--primary-500); color: #fff; }
.grid-item.current { border-color: var(--primary-500); background: var(--primary-50); color: var(--primary-500); box-shadow: var(--primary-glow); }
.grid-item.answered-correct { background: var(--success-bg); border-color: var(--success); color: var(--success); }
.grid-item.answered-incorrect { background: var(--error-bg); border-color: var(--error); color: var(--error); }
.grid-item.visited { border-color: var(--text-secondary); color: var(--text-main); }

.progress-track { height: 4px; background: rgba(255,255,255,0.1); border-radius: 0; }
.progress-fill { height: 100%; background: var(--primary-500); box-shadow: var(--primary-glow); transition: width 0.4s ease; }

/* Question Container */
.question-text { font-size: var(--font-h3); font-weight: 600; margin-bottom: var(--space-lg); color: #fff; line-height: 1.4; }
.alternative {
    display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: var(--space-md);
    padding: var(--space-md) var(--space-lg); margin-bottom: var(--space-sm); background: rgba(20, 20, 20, 0.5);
    border: 1px solid var(--border-glass); border-radius: var(--radius-sm); cursor: pointer; transition: 0.2s; min-height: 48px;
}
.alternative:hover:not(.disabled) { border-color: var(--primary-500); transform: translateX(2px); background: var(--primary-50); }
.alternative.selected { border-color: var(--primary-500); background: var(--primary-50); box-shadow: inset 4px 0 0 var(--primary-500); }
.alternative.correct { border-color: var(--success); background: var(--success-bg); }
.alternative.incorrect { border-color: var(--error); background: var(--error-bg); }
.alternative-text { font-size: var(--font-body); color: var(--text-main); }
.alternative input { width: 18px; height: 18px; cursor: pointer; }

/* Library Components redesign MD3 */
.library-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: var(--space-md); }
.library-card { background: var(--bg-glass); border: 1px solid var(--border-glass); border-radius: var(--radius-md); padding: var(--space-md); transition: var(--transition-fast); display: flex; flex-direction: column; box-shadow: var(--elevation-1); position: relative; }
.library-card:hover { border-color: var(--primary-500); transform: translateY(-2px); box-shadow: var(--elevation-2); }
.library-card.is-selected { border-color: var(--primary-500); background: rgba(196, 255, 0, 0.05); }
.library-card[data-action="toggle-card-select"] { cursor: pointer; user-select: none; }

.lib-card-header {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-glass);
}

.lib-title { font-weight: 700; color: var(--text-main); font-size: 0.9rem; margin-bottom: 2px; }
.lib-date { font-size: var(--font-tiny); color: var(--text-muted); font-family: var(--font-mono); }

.lib-stats-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--primary-500);
    margin-bottom: var(--space-sm);
}

.lib-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-box-orient: vertical;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    overflow: hidden;
    line-height: 1.5;
}

.lib-played {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.lib-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: var(--space-sm);
}

.lib-history { margin-bottom: var(--space-sm); }
.lib-history-label { display: block; font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-muted); letter-spacing: 0.08em; margin-bottom: 6px; }
.lib-history-bars { display: flex; align-items: flex-end; gap: 4px; height: 24px; }
.lib-history-bar { flex: 1; max-width: 20px; height: var(--bar-h, 50%); background: var(--bar-color, var(--primary-500)); border-radius: 2px 2px 0 0; transition: opacity 0.2s; opacity: 0.85; }
.lib-history-bar:hover { opacity: 1; }

.lib-actions { display: flex; align-items: center; gap: var(--space-xs); margin-top: auto; padding-top: var(--space-sm); }
.lib-actions .btn { flex: none; width: 40px; min-height: 40px; padding: 0; font-size: 0.75rem; }
.lib-actions .btn:first-child { flex: 1; width: auto; padding: 0 var(--space-sm); }
.lib-actions .btn-delete { color: var(--error) !important; border-left: 1px solid var(--border-glass); margin-left: 2px; padding-left: var(--space-sm) !important; border-radius: 0 var(--radius-full) var(--radius-full) 0 !important; }
.btn-delete:hover { background: var(--error-bg) !important; }

/* Selection Mode */
.lib-card-checkbox-wrap { position: absolute; top: var(--space-sm); right: var(--space-sm); z-index: 1; pointer-events: none; }
.lib-card-checkbox { width: 18px; height: 18px; accent-color: var(--primary-500); }

/* Storage Circular Indicator */
.storage-indicator {
    width: 40px;
    height: 40px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.storage-circle {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.storage-circle-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.08);
    stroke-width: 3;
}

.storage-circle-fill {
    fill: none;
    stroke: var(--primary-500);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.6s cubic-bezier(0.4, 0, 0.2, 1), stroke 0.3s ease;
}

.storage-circle-text {
    fill: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 8px;
    font-weight: 700;
    text-anchor: middle;
    transform: rotate(90deg);
    transform-origin: center;
}

.storage-circle-fill.warn {
    stroke: #ffcc00;
}

.storage-circle-fill.danger {
    stroke: var(--error);
}

.lib-bulk-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
}

/* Builder / Creator */
.builder-card { background: var(--bg-glass); border: 1px solid var(--border-glass); border-radius: var(--radius-lg); margin-bottom: var(--space-md); overflow: hidden; box-shadow: var(--elevation-1); }
.builder-header { display: flex; justify-content: space-between; align-items: center; padding: var(--space-md); background: rgba(255,255,255,0.02); cursor: pointer; }
.builder-title-wrapper { display: flex; align-items: center; gap: var(--space-sm); }
.status-icon { 
    width: 20px; height: 20px; border-radius: 4px; border: 2px solid var(--text-muted);
    display: grid; place-content: center; color: transparent; transition: 0.3s;
}
.builder-card.completed .status-icon { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.builder-card-body { padding: var(--space-md) var(--space-lg); border-top: 1px solid var(--border-glass); }

.drag-handle { color: var(--text-muted); font-family: var(--font-mono); font-size: 0.8rem; user-select: none; cursor: grab; padding-right: var(--space-xs); }
.char-counter { font-family: var(--font-mono); font-size: var(--font-tiny); color: var(--text-muted); }

/* Forms */
.input-group { margin-bottom: var(--space-md); }
.input-label { display: block; font-size: var(--font-small); margin-bottom: var(--space-xs); font-weight: 600; color: var(--text-secondary); letter-spacing: 0.05em; }
.input-field {
    width: 100%; padding: 12px 16px; background: transparent; border: 1px solid var(--border-glass);
    border-radius: var(--radius-xs); color: #fff; font-size: 0.9rem; transition: border-color 0.2s;
}
.input-field:focus { border-color: var(--primary-500); border-width: 2px; padding: 11px 15px; outline: none; }

select.input-field {
    background-color: var(--surface-container);
    color: var(--text-main);
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.5)' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
select.input-field option {
    background-color: var(--surface-container);
    color: var(--text-main);
}
[data-theme="light"] select.input-field {
    background-color: var(--surface-container);
    color: var(--text-main);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='rgba(0,0,0,0.5)' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}
[data-theme="light"] select.input-field option {
    background-color: var(--surface-container);
    color: var(--text-main);
}

/* Modals */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.85); backdrop-filter: blur(4px); z-index: 2000;
    display: flex; align-items: center; justify-content: center; padding: var(--space-md); animation: fadeIn 0.2s ease-out;
}
.modal-card {
    width: 100%; max-width: 400px; background: #0a0a0a; border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl); padding: var(--space-lg); box-shadow: var(--elevation-3);
    border-top: 2px solid var(--primary-500); transform: scale(0.98); animation: zoomIn 0.2s var(--ease-out-expo) forwards;
}
@keyframes zoomIn { to { transform: scale(1); } }
.modal-header { margin-bottom: var(--space-md); display: flex; align-items: center; gap: var(--space-sm); }
.modal-title { font-family: var(--font-mono); font-weight: 700; color: var(--primary-500); letter-spacing: 0.05em; font-size: 0.9rem; }
.modal-body { margin-bottom: var(--space-lg); line-height: 1.4; font-size: 0.9rem; color: var(--text-secondary); }
.modal-footer { display: flex; gap: var(--space-sm); justify-content: flex-end; }

.info-box { background: var(--bg-glass); padding: var(--space-md); border-radius: var(--radius-md); border: 1px solid var(--border-glass); display: flex; flex-direction: column; gap: var(--space-sm); }
.info-item { display: flex; gap: var(--space-md); align-items: flex-start; }
.info-num { color: var(--primary-500); font-family: var(--font-mono); font-weight: 700; font-size: 0.9rem; }
.info-text { font-size: 0.85rem; line-height: 1.4; color: var(--text-main); }

/* Results & Review */
.result-header { text-align: center; margin-bottom: var(--space-xl); }
.result-score { font-family: var(--font-mono); font-size: 3rem; font-weight: 800; color: var(--primary-500); line-height: 1; }
.result-percent { font-size: 1.2rem; font-weight: 700; color: var(--text-secondary); margin-top: var(--space-sm); }

.review-card { padding: var(--space-md); margin-bottom: var(--space-sm); border: 1px solid var(--border-glass); border-radius: var(--radius-lg); background: rgba(255, 255, 255, 0.02); transition: var(--transition-fast); box-shadow: var(--elevation-1); }
.review-card:hover { border-color: var(--primary-500); background: rgba(255, 255, 255, 0.04); }
.review-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-xs); font-size: var(--font-tiny); font-family: var(--font-mono); }
.review-card-body { font-weight: 600; color: var(--text-main); font-size: 0.85rem; }

/* Feedback Messages */
.feedback-message { margin-top: var(--space-lg); padding: var(--space-md); border-radius: var(--radius-md); font-size: 0.85rem; display: flex; gap: var(--space-sm); align-items: start; animation: slideUp 0.3s ease-out; border-left: 4px solid transparent; }
.feedback-message.correct { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }
.feedback-message.incorrect { background: var(--error-bg); color: var(--error); border: 1px solid var(--error); }

/* Global Misc */
.navigation {
    display: flex; flex-direction: column-reverse; gap: var(--space-sm);
    margin-top: var(--space-xl); padding-top: var(--space-lg);
    border-top: 1px solid var(--border-glass); align-items: stretch;
}
.navigation .btn { width: 100%; flex: 1; z-index: 1; }

.footer { margin-top: var(--space-2xl); padding: var(--space-xl) 0; border-top: 1px solid var(--border-glass); text-align: center; color: var(--text-muted); }
.footer p { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: var(--space-md); }
.dev-profile-img { width: 48px; height: 48px; border-radius: var(--radius-lg); border: 2px solid var(--border-glass); margin-bottom: var(--space-sm); object-fit: cover; filter: grayscale(80%) contrast(1.2); transition: all 0.4s var(--ease-out-expo); background: var(--bg-glass); display: inline-block; }
.dev-profile-img:hover { filter: grayscale(0%) contrast(1); border-color: var(--primary-500); box-shadow: var(--primary-glow); transform: scale(1.05); }

.badge { font-size: var(--font-tiny); font-weight: 700; text-transform: uppercase; padding: 3px 10px; border-radius: var(--radius-full); background: var(--primary-50); color: var(--primary-500); border: 1px solid var(--border-glass); letter-spacing: 0.05em; display: inline-flex; align-items: center; white-space: nowrap; }
.badge.correct { color: var(--success); border-color: var(--success); background: var(--success-bg); }
.badge.incorrect { color: var(--error); border-color: var(--error); background: var(--error-bg); }
.badge.pending { color: #ffd700; border-color: #ffd700; background: rgba(255, 215, 0, 0.1); }

.toast { position: fixed; top: var(--space-lg); right: var(--space-lg); z-index: 3000; background: var(--bg-glass); border: 1px solid var(--border-glass); border-left: 4px solid var(--primary-500); padding: var(--space-md) var(--space-lg); border-radius: var(--radius-sm); box-shadow: 0 10px 30px rgba(0,0,0,0.5); color: #fff; min-width: 260px; display: flex; align-items: center; justify-content: space-between; animation: slideInRight 0.4s ease-out forwards; backdrop-filter: blur(8px); }
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--error); }

.toast-close {
    background: transparent; border: none; color: var(--text-muted);
    cursor: pointer; padding: 4px; display: flex; align-items: center; justify-content: center;
    border-radius: var(--radius-sm); transition: var(--transition-fast);
}
.toast-close:hover { color: var(--primary-500); background: rgba(255, 255, 255, 0.05); }

@keyframes slideInRight { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

.skeleton { background: linear-gradient(90deg, var(--bg-glass) 25%, rgba(255,255,255,0.05) 50%, var(--bg-glass) 75%); background-size: 200% 100%; animation: skeleton-loading 1.5s infinite; border-radius: var(--radius-sm); }
@keyframes skeleton-loading { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-card { height: 120px; width: 100%; border-radius: var(--radius-md); border: 1px solid var(--border-glass); background: var(--bg-glass); }

/* Core Misc & Utilities */
.hidden { display: none !important; }
.fade-in { animation: fadeIn 0.6s ease-out; }
.slide-up { animation: slideUp 0.6s ease-out; }

/* Grid & Flex Helpers */
.flex-center { display: flex; align-items: center; justify-content: center; }

/* Step indicator */
.step-flow { display: flex; flex-direction: column; gap: var(--space-sm); counter-reset: steps; }
.step-item { flex: 1; display: flex; flex-direction: column; align-items: center; text-align: center; padding: var(--space-lg); position: relative; }
.step-number { width: 48px; height: 48px; border-radius: var(--radius-full); background: rgba(196, 255, 0, 0.1); border: 2px solid var(--primary-500); color: var(--primary-500); font-family: var(--font-mono); font-weight: 700; font-size: 1.1rem; display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-md); flex-shrink: 0; }
.step-item h3 { font-size: 0.9rem; font-weight: 700; color: var(--text-main); margin-bottom: var(--space-xs); }
.step-item p { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.5; }

/* Stat strip */
.stat-strip { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-sm); margin: var(--space-xl) 0; }
.stat-item { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: var(--space-md); background: var(--surface-container); border: 1px solid var(--border-glass); border-radius: var(--radius-lg); min-height: 88px; }
.stat-value { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 800; color: var(--primary-500); line-height: 1; min-height: 1.5rem; display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-xs); }
.stat-label { font-size: 0.68rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; line-height: 1.3; }

/* Docs */
.docs-layout { display: grid; grid-template-columns: 1fr; gap: var(--space-xl); min-width: 0; }
.docs-layout > * { min-width: 0; }
.docs-section .feature-card { flex-direction: column; gap: var(--space-sm); }
.docs-section .feature-card h3 { margin-bottom: var(--space-xs); }
.docs-section .feature-card p, .docs-section .feature-card li { margin-bottom: var(--space-xs); font-size: var(--font-body); line-height: 1.6; color: var(--text-secondary); }
.docs-section .feature-card ol { padding-left: var(--space-lg); }
.docs-sidebar { position: sticky; top: calc(var(--header-height) + var(--space-md)); background: var(--surface-container); border: 1px solid var(--border-glass); border-radius: var(--radius-lg); padding: var(--space-md); }
.docs-sidebar-title { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; padding-bottom: var(--space-sm); border-bottom: 1px solid var(--border-glass); margin-bottom: var(--space-sm); }
.docs-nav-link { display: flex; align-items: center; gap: var(--space-sm); padding: 6px var(--space-sm); border-radius: var(--radius-sm); color: var(--text-secondary); text-decoration: none; font-size: 0.82rem; transition: all 0.15s; }
.docs-nav-link:hover, .docs-nav-link.active { background: var(--primary-50); color: var(--primary-500); }
.search-container { margin-bottom: var(--space-lg); position: relative; }
.search-input { width: 100%; padding: 12px 16px 12px 44px; background: var(--surface-container); border: 1px solid var(--border-glass); border-radius: var(--radius-full); color: var(--text-main); font-size: 0.9rem; transition: 0.2s; font-family: var(--font-sans); }
.search-input:focus { border-color: var(--primary-500); border-width: 2px; padding: 11px 15px 11px 43px; outline: none; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); display: flex; align-items: center; pointer-events: none; }
.search-highlight { background: rgba(196, 255, 0, 0.25); color: var(--text-main); border-radius: 2px; padding: 0 2px; }
.tip-box { background: rgba(0, 255, 157, 0.05); border-left: 3px solid var(--success); padding: var(--space-md); margin: var(--space-md) 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: 0.85rem; }
.warning-box { background: rgba(255, 0, 85, 0.08); border-left: 3px solid var(--error); padding: var(--space-md); margin: var(--space-md) 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: 0.85rem; }
.docs-section { margin-bottom: var(--space-xl); padding-bottom: var(--space-xl); border-bottom: 1px solid var(--border-glass); }
.docs-section:last-child { border-bottom: none; }
.docs-section h2 { font-size: var(--font-h2); margin-bottom: var(--space-md); display: flex; align-items: center; gap: var(--space-sm); scroll-margin-top: 72px; }
.docs-section h3 { font-size: var(--font-h3); margin-top: var(--space-lg); margin-bottom: var(--space-sm); color: var(--text-secondary); }
.docs-section p, .docs-section li { font-size: var(--font-body); margin-bottom: var(--space-sm); line-height: 1.7; color: var(--text-secondary); }
pre { background: var(--surface-container); border: 1px solid var(--border-glass); border-radius: var(--radius-md); padding: var(--space-md); font-size: 0.78rem; margin-bottom: var(--space-md); overflow-x: auto; }

/* ── Library Tabs ──────────────────────────────────────── */
.lib-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 0;
}

.lib-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
    position: relative;
    bottom: -1px;
}

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

.lib-tab.active {
    color: var(--primary-500);
    border-bottom-color: var(--primary-500);
}

/* ── Wrong Badge (na aba Revisão) ──────────────────────── */
.lib-wrong-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background: var(--error);
    color: #fff;
    border-radius: var(--radius-full);
    font-size: 0.65rem;
    font-family: var(--font-mono);
    font-weight: 700;
    line-height: 1;
}

/* ── Review Panel ──────────────────────────────────────── */
.review-info-notice {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    border-left: 3px solid var(--primary-500);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.review-quiz-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.review-quiz-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color 0.15s;
}

.review-quiz-row:not(.disabled):hover {
    border-color: var(--primary-500);
}

.review-quiz-row.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.review-quiz-row input[type="checkbox"] {
    accent-color: var(--primary-500);
    width: 15px;
    height: 15px;
    flex-shrink: 0;
}

.review-quiz-name {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.review-quiz-count {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.review-quiz-count.has-errors {
    color: var(--error);
    font-weight: 700;
}

/* ── Review Quantity Slider ────────────────────────────── */
.review-qty-section {
    margin-bottom: var(--space-lg);
}

.review-qty-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.review-qty-value {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-500);
}

.review-qty-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Responsive Unified System */
@media (max-width: 480px) {
    .hero-title { font-size: 1.5rem; }
    .hero-section .btn { width: 100%; justify-content: center; min-height: 48px; }
}

@media (max-width: 767px) {
    .container { padding: 0 var(--space-md); }
    .hide-mobile { display: none !important; }
    .navigation { flex-direction: column-reverse; gap: var(--space-sm); align-items: stretch; }
    .navigation .btn, #prevBtn { width: 100%; flex: 1; padding: 0 var(--space-md); min-width: unset; }
    .library-grid { grid-template-columns: 1fr; }
    .docs-sidebar { display: none; }
    .docs-content { padding: var(--space-md) !important; }
    pre { max-width: 100%; min-width: 0; word-break: break-all; }
    code { word-break: break-word; }
    .docs-section h2 { flex-wrap: wrap; word-break: break-word; }
    .feature-card { overflow-x: hidden; min-width: 0; }
    table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (min-width: 768px) {
    body { padding-top: calc(var(--header-height) + var(--space-xl)); }
    .header { height: var(--header-height); padding: 0 var(--space-xl); }
    .step-flow { flex-direction: row; align-items: flex-start; }
    .stat-strip { grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }
    .features-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
    .quiz-info-bar { flex-direction: row; justify-content: space-between; padding: 0 var(--space-md); text-align: left; }
    .score-display { width: auto; }
    .navigation { flex-direction: row; gap: var(--space-md); align-items: center; }
    .navigation .btn { width: auto; flex: none; }
    #prevBtn { width: 44px; flex: none; padding: 0; min-width: 44px; }
    .library-grid { grid-template-columns: repeat(2, 1fr); }
    .docs-sidebar { display: none; }
}

@media (min-width: 1024px) {
    body { background-attachment: fixed; }
    .library-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
}

@media (min-width: 900px) {
    .docs-sidebar { display: block; }
    .docs-layout { grid-template-columns: 220px 1fr; align-items: start; }
}