/* ═══════════════════════════════════════════════
   SSI Academy — Design System & Styles
   ═══════════════════════════════════════════════ */

/* ── CSS Variables ── */
:root {
    /* Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a1f35;
    --bg-card-hover: #222845;
    --bg-surface: rgba(255, 255, 255, 0.03);
    
    --text-primary: #f0f4ff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-cyan: #06b6d4;
    
    --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #8b5cf6, #ec4899);
    --gradient-success: linear-gradient(135deg, #10b981, #06b6d4);
    --gradient-warm: linear-gradient(135deg, #f59e0b, #ef4444);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(139, 92, 246, 0.3);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --font-sans: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-purple) var(--bg-primary);
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-purple); border-radius: 4px; }

/* ── Particles Background ── */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-purple);
    border-radius: 50%;
    opacity: 0.15;
    animation: particleFloat linear infinite;
}

@keyframes particleFloat {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.15; }
    90% { opacity: 0.15; }
    100% { transform: translateY(-10vh) rotate(360deg); opacity: 0; }
}

/* ── Navbar ── */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 40px;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 12px 40px;
    box-shadow: var(--shadow-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.nav-title {
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(139, 92, 246, 0.1);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent-purple);
    border-radius: 1px;
}

/* ── Hero Section ── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 100px 60px 60px;
    position: relative;
    gap: 60px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(139, 92, 246, 0.08), transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.06), transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(236, 72, 153, 0.05), transparent 50%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-purple);
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-subtitle strong {
    color: var(--accent-cyan);
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ── Hero Visual ── */
.hero-visual {
    position: relative;
    z-index: 1;
    width: 400px;
    height: 400px;
    flex-shrink: 0;
}

.hero-card {
    position: absolute;
    width: 120px;
    height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-glow);
    transition: var(--transition);
    animation: heroFloat 6s ease-in-out infinite;
}

.hero-card:hover {
    transform: scale(1.1);
    border-color: var(--accent-purple);
}

.card-did {
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    border-color: rgba(59, 130, 246, 0.3);
    animation-delay: 0s;
}

.card-vc {
    bottom: 40px;
    left: 30px;
    border-color: rgba(16, 185, 129, 0.3);
    animation-delay: 2s;
}

.card-key {
    bottom: 40px;
    right: 30px;
    border-color: rgba(245, 158, 11, 0.3);
    animation-delay: 4s;
}

@keyframes heroFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.card-did { animation: heroFloat 6s ease-in-out infinite; }

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.card-label {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-purple);
    background: rgba(139, 92, 246, 0.1);
}

.btn-action {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    flex-direction: column;
    padding: 16px 24px;
    min-width: 170px;
}

.btn-action:hover:not(:disabled) {
    border-color: var(--accent-purple);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-action:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-action .btn-step {
    font-size: 0.75rem;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-reset {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid rgba(255,255,255,0.05);
    padding: 12px 20px;
}

.btn-reset:hover {
    color: var(--accent-red);
    border-color: rgba(239, 68, 68, 0.3);
}

/* ── Sections ── */
.section {
    padding: 100px 60px;
    position: relative;
    z-index: 1;
}

.section-dark {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ── Concepts Grid ── */
.concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.concept-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
}

.concept-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px);
}

.concept-card.expanded {
    border-color: var(--accent-purple);
}

.concept-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.concept-icon {
    font-size: 1.8rem;
}

.concept-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
}

.concept-badge {
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent-purple);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.concept-brief {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.concept-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                padding 0.3s ease,
                opacity 0.3s ease;
    opacity: 0;
}

.concept-card.expanded .concept-detail {
    max-height: 800px;
    padding-top: 16px;
    opacity: 1;
}

.concept-expand {
    text-align: center;
    padding-top: 8px;
}

.expand-icon {
    color: var(--text-muted);
    font-size: 0.8rem;
    transition: var(--transition);
}

.concept-card.expanded .expand-icon {
    transform: rotate(180deg);
    color: var(--accent-purple);
}

/* ── Concept Detail Styles ── */
.detail-analogy {
    background: rgba(59, 130, 246, 0.08);
    border-left: 3px solid var(--accent-blue);
    padding: 12px 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.detail-features {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.detail-features li {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* DID Anatomy */
.did-anatomy {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    text-align: center;
    overflow-x: auto;
}

.did-example {
    font-family: var(--font-mono);
    font-size: 1rem;
}

.did-part {
    padding: 4px 8px;
    border-radius: 4px;
    cursor: help;
    position: relative;
    transition: var(--transition);
}

.did-part:hover {
    transform: scale(1.05);
}

.did-scheme { background: rgba(59, 130, 246, 0.2); color: var(--accent-blue); }
.did-method { background: rgba(139, 92, 246, 0.2); color: var(--accent-purple); }
.did-network { background: rgba(16, 185, 129, 0.2); color: var(--accent-green); }
.did-id { background: rgba(245, 158, 11, 0.2); color: var(--accent-orange); }
.did-separator { color: var(--text-muted); }

.did-part[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    white-space: nowrap;
    color: var(--text-primary);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

/* Key Pair Visual */
.key-pair-visual {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
}

.key-box {
    flex: 1;
    padding: 16px;
    border-radius: var(--radius-md);
    text-align: center;
}

.key-box h4 {
    font-size: 0.95rem;
    margin: 8px 0 4px;
}

.key-box p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.key-box ul {
    list-style: none;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.key-box ul li {
    padding: 3px 0;
}

.key-private {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.key-public {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

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

.key-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 0.7rem;
    min-width: 50px;
}

.arrow-line {
    width: 40px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
}

/* Verkey comparison */
.verkey-comparison {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.comparison-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.comp-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.comparison-item code {
    font-family: var(--font-mono);
    padding: 6px 14px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--accent-cyan);
}

.comparison-arrow {
    color: var(--accent-green);
    font-weight: 700;
    font-size: 0.85rem;
}

/* JSON Display */
.json-display {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto;
    font-size: 0.82rem;
    line-height: 1.8;
    margin-top: 12px;
}

.json-display code {
    font-family: var(--font-mono);
}

.json-key { color: var(--accent-purple); }
.json-str { color: var(--accent-green); }

/* VC Examples */
.vc-examples {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.vc-example-item {
    padding: 8px 16px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 20px;
    font-size: 0.85rem;
}

.vc-structure {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.vc-part {
    background: var(--bg-primary);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* VP Visual */
.vp-visual {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
}

.vp-full, .vp-partial {
    flex: 1;
    padding: 14px;
    border-radius: var(--radius-md);
}

.vp-full {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.vp-partial {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.vp-full h4, .vp-partial h4 {
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.vp-field {
    font-size: 0.8rem;
    padding: 4px 0;
    color: var(--text-secondary);
}

.vp-shared {
    color: var(--accent-green);
    font-weight: 600;
}

.vp-hidden {
    color: var(--text-muted);
    font-style: italic;
    text-decoration: line-through;
}

.vp-arrow {
    color: var(--accent-orange);
    font-size: 1.5rem;
    text-align: center;
    min-width: 60px;
}

.vp-arrow small {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ═══════════════════════════════════════════════
   DEMO SECTION
   ═══════════════════════════════════════════════ */

.demo-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Step Tracker */
.step-tracker {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 48px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.step-number {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    font-weight: 700;
    font-size: 1rem;
    transition: var(--transition);
}

.step.active .step-number {
    background: var(--gradient-primary);
    border-color: var(--accent-purple);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.3);
}

.step.completed .step-number {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.step.completed .step-number::after {
    content: '✓';
}

.step-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.step.active .step-label {
    color: var(--accent-purple);
}

.step.completed .step-label {
    color: var(--accent-green);
}

.step-connector {
    width: 80px;
    height: 2px;
    background: var(--border-color);
    margin-bottom: 28px;
    transition: var(--transition);
}

.step-connector.done {
    background: var(--accent-green);
}

/* Demo Panels */
.demo-panels {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* Actors */
.demo-actors {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.actor {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.actor.active {
    transform: scale(1.02);
}

.actor-issuer.active { border-color: var(--accent-green); box-shadow: 0 0 25px rgba(16, 185, 129, 0.15); }
.actor-holder.active { border-color: var(--accent-blue); box-shadow: 0 0 25px rgba(59, 130, 246, 0.15); }
.actor-verifier.active { border-color: var(--accent-orange); box-shadow: 0 0 25px rgba(245, 158, 11, 0.15); }

.actor-avatar {
    font-size: 3rem;
    margin-bottom: 8px;
    animation: none;
}

.actor.active .actor-avatar {
    animation: actorPulse 1.5s ease-in-out infinite;
}

@keyframes actorPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.actor h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.actor-role {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.actor-did {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-primary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    word-break: break-all;
    transition: var(--transition);
}

.actor-did.has-did {
    color: var(--accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

/* Wallet */
.wallet {
    margin-top: 12px;
    background: var(--bg-primary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    transition: var(--transition);
}

.wallet.has-vc {
    border-style: solid;
    border-color: rgba(16, 185, 129, 0.3);
    background: rgba(16, 185, 129, 0.05);
}

.wallet-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.wallet-content {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.wallet-content.has-content {
    color: var(--accent-green);
}

/* Blockchain */
.blockchain {
    background: var(--bg-card);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.blockchain-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.blockchain-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.chain-icon {
    font-size: 1.3rem;
}

.blockchain-blocks {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding: 8px 0;
}

.block {
    min-width: 130px;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    animation: blockAppear 0.5s ease-out;
    flex-shrink: 0;
}

.genesis-block {
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--accent-purple);
}

.block-label {
    font-weight: 600;
    margin-bottom: 4px;
}

.block-data {
    font-size: 0.7rem;
    color: var(--text-muted);
}

@keyframes blockAppear {
    from { opacity: 0; transform: translateY(10px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Demo Actions */
.demo-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Console */
.console {
    background: #0d1117;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.console-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.console-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.console-dot.red { background: #ff5f57; }
.console-dot.yellow { background: #febc2e; }
.console-dot.green { background: #28c840; }

.console-title {
    margin-left: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.console-body {
    padding: 16px;
    max-height: 300px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.8;
}

.console-line {
    display: flex;
    gap: 8px;
    animation: consoleFadeIn 0.3s ease;
}

@keyframes consoleFadeIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.console-prompt {
    color: var(--accent-green);
    user-select: none;
}

.console-text {
    color: var(--text-secondary);
}

.console-text.success { color: var(--accent-green); }
.console-text.info { color: var(--accent-blue); }
.console-text.warn { color: var(--accent-orange); }
.console-text.highlight { color: var(--accent-cyan); }
.console-text.error { color: var(--accent-red); }

/* ═══════════════════════════════════════════════
   FLOW SECTION
   ═══════════════════════════════════════════════ */

.flow-container {
    max-width: 1100px;
    margin: 0 auto;
}

.flow-diagram {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.flow-column {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.flow-actor-header {
    padding: 20px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.flow-actor-header span {
    font-size: 2rem;
}

.flow-actor-header h3 {
    font-size: 1.1rem;
}

.flow-actor-header p {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
}

.issuer-bg { background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2)); border: 1px solid rgba(16, 185, 129, 0.3); }
.holder-bg { background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2)); border: 1px solid rgba(59, 130, 246, 0.3); }
.verifier-bg { background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.2)); border: 1px solid rgba(245, 158, 11, 0.3); }

.flow-steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: default;
}

.flow-step:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
}

.flow-step-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.flow-step p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Blockchain Info */
.blockchain-info {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.blockchain-info h3 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.2rem;
}

.blockchain-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.bc-yes, .bc-no {
    padding: 20px;
    border-radius: var(--radius-md);
}

.bc-yes {
    background: rgba(16, 185, 129, 0.06);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.bc-no {
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.bc-yes h4 { color: var(--accent-green); margin-bottom: 12px; }
.bc-no h4 { color: var(--accent-red); margin-bottom: 12px; }

.bc-yes ul, .bc-no ul {
    list-style: none;
}

.bc-yes li, .bc-no li {
    padding: 4px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════
   QUIZ SECTION
   ═══════════════════════════════════════════════ */

.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.quiz-progress {
    height: 6px;
    background: rgba(255,255,255,0.05);
    border-radius: 3px;
    margin-bottom: 20px;
    overflow: hidden;
}

.quiz-progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 0.4s ease;
}

.quiz-score {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.quiz-question {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 24px;
    line-height: 1.6;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.quiz-option {
    padding: 16px 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: left;
    font-family: var(--font-sans);
}

.quiz-option:hover:not(.selected) {
    border-color: var(--accent-purple);
    background: rgba(139, 92, 246, 0.05);
    color: var(--text-primary);
}

.quiz-option.correct {
    border-color: var(--accent-green);
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.quiz-option.wrong {
    border-color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

.quiz-option.selected {
    pointer-events: none;
}

.quiz-feedback {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    display: none;
}

.quiz-feedback.show {
    display: block;
    animation: consoleFadeIn 0.3s ease;
}

.quiz-feedback.correct {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
}

.quiz-feedback.wrong {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
}

.quiz-next {
    margin-top: 20px;
    width: 100%;
}

.quiz-result {
    text-align: center;
    padding: 20px 0;
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.quiz-result h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.quiz-result p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ── Footer ── */
.footer {
    padding: 40px 60px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.footer p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-sub {
    font-size: 0.8rem;
    margin-top: 4px;
    color: var(--text-muted);
    opacity: 0.6;
}

/* ═══════════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════════ */

.transfer-animation {
    position: fixed;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    z-index: 9999;
    pointer-events: none;
    filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.5));
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */

@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 100px 30px 60px;
    }
    
    .hero-visual {
        width: 300px;
        height: 300px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .section {
        padding: 60px 24px;
    }
    
    .concepts-grid {
        grid-template-columns: 1fr;
    }
    
    .demo-actors {
        grid-template-columns: 1fr;
    }
    
    .flow-diagram {
        grid-template-columns: 1fr;
    }
    
    .blockchain-comparison {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 12px 20px;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .demo-actions {
        flex-direction: column;
    }
    
    .btn-action {
        width: 100%;
    }
    
    .step-tracker {
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .step-connector {
        width: 30px;
    }
    
    .key-pair-visual {
        flex-direction: column;
    }
    
    .vp-visual {
        flex-direction: column;
    }
    
    .quiz-container {
        padding: 24px;
    }
}