/* ============================================
   NEET Biology Q&A — CSS Design System
   Theme: Study Environment + Gradient Trust
   ============================================ */

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

:root {
    /* Classic Matte Blue Palette — Professional & Classy */
    --bg-dark: #0f172a;        /* Deep matte slate */
    --bg-surface: #1e293b;     /* Matte card bg */
    --bg-card: #1e293b;
    --bg-card-hover: #334155;

    /* Accent colors (Solid matte instead of gradients) */
    --color-primary: #2563eb;  /* Classic Blue */
    --color-secondary: #3b82f6;
    --color-tertiary: #1e40af; /* Deep Blue */
    
    /* Re-map specific components to solid colors */
    --gradient-primary: var(--color-primary);
    --gradient-classify: var(--color-primary);
    --gradient-answer: var(--color-secondary);
    --gradient-full: var(--color-tertiary);
    --gradient-text: var(--color-primary);
    --gradient-success: #15803d;
    --gradient-warning: #b45309;

    /* Text */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    /* Borders (Solid matte instead of neon glow) */
    --border-subtle: #334155;
    --border-glow: #475569; 

    /* Effects (Flat/Soft shadow instead of glassmorphism) */
    --glass-bg: #1e293b; 
    --glass-border: #334155;
    --glass-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);

    /* Sizing */
    --max-width: 820px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}


/* ── Ambient Background Orbs (Disabled for professional look) ──────────────── */
.ambient-bg {
    display: none;
}


/* ── Navbar ───────────────────────────────── */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #f59e0b;
    animation: pulse 2s ease-in-out infinite;
}

.status-dot.online { background: #10b981; }
.status-dot.offline { background: #ef4444; animation: none; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}


/* ── Gradient Text (Flattened to solid color) ────────────────────────── */
.gradient-text {
    color: var(--color-secondary);
}


/* ── Main Container ───────────────────────── */
.main-container {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px 60px;
}


/* ── Hero Section ─────────────────────────── */
.hero {
    text-align: center;
    padding: 48px 0 36px;
}

.hero-title {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 14px;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}


/* ── Matte Card ───────────────────────────── */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow);
    transition: border-color var(--transition-normal);
}

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


/* ── Input Section ────────────────────────── */
.input-section {
    margin-bottom: 28px;
}

.input-card {
    padding: 24px;
}

.input-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
}

.input-icon {
    font-size: 1.2rem;
}

.input-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.question-textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 16px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    outline: none;
}

.question-textarea::placeholder {
    color: var(--text-muted);
}

.question-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.char-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}


/* ── Action Buttons ───────────────────────── */
.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    color: white;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    background: rgba(0, 0, 0, 0.1); /* Darken instead of glowing light on hover */
    transition: opacity var(--transition-fast);
}

.btn:hover::before { opacity: 1; }

.btn:active {
    transform: translateY(1px); /* More solid matte feel */
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn:disabled::before { opacity: 0; }

.btn-classify { background: var(--gradient-classify); }
.btn-answer { background: var(--gradient-answer); }
.btn-full { background: var(--gradient-full); }
.btn-retry {
    background: var(--gradient-primary);
    margin-top: 12px;
}

.btn-icon {
    font-size: 1rem;
}


/* ── Loading Section ──────────────────────── */
.loading-section {
    margin-bottom: 28px;
}

.loader-card {
    padding: 32px;
    text-align: center;
}

.loader-spinner {
    width: 44px;
    height: 44px;
    margin: 0 auto 16px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loader-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.loader-steps {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.loader-step {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    opacity: 0;
    animation: fadeIn 0.4s ease forwards;
}

.loader-step.done {
    color: #10b981;
}

@keyframes fadeIn {
    to { opacity: 1; }
}


/* ── Result Cards ─────────────────────────── */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card {
    padding: 24px;
    animation: slideUp 0.5s ease;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-subtle);
}

.card-icon {
    font-size: 1.2rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    flex: 1;
}


/* ── Confidence Badge ─────────────────────── */
.confidence-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.confidence-high {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.confidence-medium {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.25);
}

.confidence-low {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.25);
}


/* ── Classification Content ───────────────── */
.classification-content {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.chapter-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(37, 99, 235, 0.05); /* very soft blue */
    border-radius: var(--radius-md);
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.chapter-info .label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.chapter-info .value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.topics-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.topic-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    transition: background var(--transition-fast);
}

.topic-item:hover {
    background: var(--bg-card-hover);
}

.topic-name {
    display: flex;
    align-items: center;
    gap: 8px;
}

.topic-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-secondary);
    background: rgba(37, 99, 235, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.topic-title {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.topic-similarity {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--text-muted);
}


/* ── Answer Content ───────────────────────── */
.answer-content {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-primary);
    white-space: pre-wrap;
}


/* ── Verification Badge ───────────────────── */
.verification-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
}

.verified-true {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.verified-false {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.25);
}


/* ── Justification List ───────────────────── */
.justification-list {
    list-style: none;
    counter-reset: step;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.justification-list li {
    counter-increment: step;
    display: flex;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    border-left: 3px solid;
    border-image: var(--gradient-primary) 1;
}

.justification-list li::before {
    content: counter(step);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    font-size: 0.72rem;
    font-weight: 700;
    flex-shrink: 0;
}


/* ── Sources List ─────────────────────────── */
.sources-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.source-item {
    padding: 14px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    transition: border-color var(--transition-fast);
}

.source-item:hover {
    border-color: var(--border-glow);
}

.source-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.source-chapter {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-secondary);
    background: rgba(37, 99, 235, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.source-section {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.source-similarity {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-left: auto;
}

.source-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}


/* ── Error Section ────────────────────────── */
.error-card {
    padding: 28px;
    text-align: center;
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.error-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.error-message {
    color: #f87171;
    font-size: 0.95rem;
    margin-bottom: 4px;
}


/* ── Footer ───────────────────────────────── */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 24px;
    font-size: 0.82rem;
    color: var(--text-muted);
    border-top: 1px solid var(--glass-border);
}


/* ── Responsive ───────────────────────────── */
@media (max-width: 640px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-subtitle {
        font-size: 0.88rem;
    }

    .action-buttons {
        width: 100%;
    }

    .btn {
        flex: 1;
        justify-content: center;
        padding: 10px 12px;
        font-size: 0.82rem;
    }

    .input-footer {
        flex-direction: column;
        align-items: stretch;
    }

    .char-count {
        text-align: right;
    }

    .topic-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .source-similarity {
        margin-left: 0;
    }
}