/* ===== CSS Variables ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #1e293b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-hero: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.4);

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }

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

.text-success { color: var(--success); }
.text-danger { color: var(--danger); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
}

.logo {
    color: var(--text-primary);
}

.logo-sign {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

/* Language Toggle Button */
.lang-toggle {
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: var(--primary-light);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 40px;
}

.lang-toggle:hover {
    background: rgba(99, 102, 241, 0.25);
    border-color: var(--primary);
    color: var(--text-primary);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links .btn {
    padding: 10px 20px;
}

.nav-mobile {
    display: none;
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--gradient-hero);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--primary-light);
    margin-bottom: 24px;
}

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

.hero h1 {
    margin-bottom: 24px;
}

/* Hero Badges */
.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.hero-badge-item {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--primary-light);
    font-weight: 500;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    max-width: 500px;
}

.hero-subtitle strong {
    color: var(--text-primary);
}

.hero-note {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

/* Hero Feature Cards (三連卡) */
.hero-features {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

.hero-feature-card {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    flex: 1;
}

.hero-feature-card.warning {
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.05);
}

.feature-icon-sm {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.hero-feature-card strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.875rem;
    margin-bottom: 4px;
}

.hero-feature-card p {
    margin: 0;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Hero Visual */
.hero-visual {
    position: relative;
}

.app-preview {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.window-controls {
    display: flex;
    gap: 8px;
}

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

.control.red { background: #ef4444; }
.control.yellow { background: #f59e0b; }
.control.green { background: #22c55e; }

.preview-title {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.preview-content {
    padding: 24px;
}

.wallet-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--gradient-hero);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
}

.wallet-icon {
    font-size: 2.5rem;
}

.wallet-info {
    display: flex;
    flex-direction: column;
}

.wallet-name {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.wallet-balance {
    font-size: 1.5rem;
    font-weight: 700;
}

.chain-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.chain-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.chain-logo {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

.chain-logo.eth { background: linear-gradient(135deg, #627eea, #8a9ff7); }
.chain-logo.bnb { background: linear-gradient(135deg, #f3ba2f, #f0b90b); }
.chain-logo.matic { background: linear-gradient(135deg, #8247e5, #a066ff); }

.chain-value {
    margin-left: auto;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.action-btn {
    flex: 1;
    padding: 10px;
    background: var(--bg-card-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.action-btn.primary {
    background: var(--gradient-primary);
    border: none;
}

.action-btn:hover {
    transform: translateY(-1px);
}

.usb-indicator {
    position: absolute;
    bottom: -20px;
    right: 40px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--bg-card);
    border: 1px solid var(--success);
    border-radius: var(--radius-lg);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.2);
}

.usb-icon {
    color: var(--success);
}

.usb-indicator span {
    font-size: 0.875rem;
    color: var(--success);
    font-weight: 500;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15) 0%, transparent 60%);
    pointer-events: none;
    z-index: -1;
}

/* ===== Problem Section ===== */
.problem {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(30, 41, 59, 0.5) 100%);
}

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

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--gradient-hero);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 16px auto 0;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.problem-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s;
}

.problem-card:hover {
    transform: translateY(-4px);
    border-color: var(--danger);
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.1);
}

.problem-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.problem-card h3 {
    margin-bottom: 12px;
}

.problem-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.problem-stat {
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.stat-bad {
    color: var(--danger);
    font-weight: 600;
    font-size: 0.875rem;
}

/* ===== Solution Section ===== */
.solution {
    padding: 100px 0;
}

.solution-comparison {
    display: flex;
    align-items: stretch;
    gap: 24px;
    margin-bottom: 60px;
}

.comparison-card {
    flex: 1;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.comparison-card.hot {
    border-color: rgba(239, 68, 68, 0.3);
}

.comparison-card.cold {
    border-color: rgba(16, 185, 129, 0.3);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, transparent 100%);
}

.comparison-vs {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-muted);
    padding: 0 16px;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.card-icon {
    font-size: 2rem;
}

.card-header h3 {
    flex: 1;
}

.card-badge {
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

.card-badge.danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.card-badge.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.card-list {
    list-style: none;
}

.card-list li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.card-list li:last-child {
    border-bottom: none;
}

.card-list li::before {
    position: absolute;
    left: 0;
    font-size: 1rem;
}

.card-list li.negative::before {
    content: '✕';
    color: var(--danger);
}

.card-list li.positive::before {
    content: '✓';
    color: var(--success);
}

/* Security Flow */
.security-flow {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.security-flow h3 {
    text-align: center;
    margin-bottom: 32px;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    max-width: 180px;
}

.step-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.step-content h4 {
    margin-bottom: 4px;
}

.step-content p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.flow-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
}

/* Defense Layers (三層防線) */
.defense-layers {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 32px;
}

.defense-layer {
    display: flex;
    gap: 24px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.defense-layer:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.defense-layer.highlight {
    border-color: var(--success);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.layer-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.defense-layer.highlight .layer-number {
    background: var(--success);
}

.layer-content {
    flex: 1;
}

.layer-content h3 {
    margin: 0 0 8px 0;
    font-size: 1.25rem;
}

.layer-desc {
    color: var(--text-secondary);
    margin: 0 0 12px 0;
}

.layer-details {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
}

.layer-details li {
    font-size: 0.875rem;
    color: var(--text-muted);
    position: relative;
    padding-left: 16px;
}

.layer-details li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary);
}

.defense-layer.highlight .layer-details li::before {
    color: var(--success);
}

/* Security Note */
.security-note {
    padding: 16px 24px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
}

.security-note p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.security-note strong {
    color: #f59e0b;
}

/* Security Roadmap */
.security-roadmap {
    margin-top: 32px;
    padding: 24px 32px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-lg);
}

.roadmap-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.roadmap-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.roadmap-text {
    flex: 1;
}

.roadmap-text p {
    margin: 0;
    line-height: 1.6;
}

.roadmap-current {
    color: var(--text-primary);
    margin-bottom: 8px !important;
}

.roadmap-next {
    color: var(--primary-light);
}

.roadmap-next strong {
    color: var(--success);
}

/* ===== Features Section ===== */
.features {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(30, 41, 59, 0.5) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.1);
}

.feature-card.featured {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
    border-color: var(--primary);
}

.feature-card.featured.full-width {
    grid-column: span 3;
}

.feature-card.featured:hover {
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.2);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.feature-chains {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.chain-badge {
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

.chain-badge.eth { background: rgba(98, 126, 234, 0.2); color: #8a9ff7; }
.chain-badge.bnb { background: rgba(243, 186, 47, 0.2); color: #f3ba2f; }
.chain-badge.matic { background: rgba(130, 71, 229, 0.2); color: #a066ff; }
.chain-badge.arb { background: rgba(40, 160, 240, 0.2); color: #28a0f0; }
.chain-badge.op { background: rgba(255, 4, 32, 0.2); color: #ff6666; }
.chain-badge.base { background: rgba(0, 82, 255, 0.2); color: #6699ff; }

.feature-badge {
    display: inline-block;
    margin-top: 16px;
    padding: 6px 12px;
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ===== Pricing Section ===== */
.pricing {
    padding: 100px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
}

.pricing-card {
    position: relative;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.2);
    transform: scale(1.05);
}

.pricing-card.compare {
    background: rgba(30, 41, 59, 0.5);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 20px;
    background: var(--gradient-primary);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.pricing-header h3 {
    margin-bottom: 16px;
}

.price {
    display: flex;
    flex-direction: column;
}

.price-value {
    font-size: 3rem;
    font-weight: 800;
}

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

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
}

.pricing-features.muted li::before {
    color: var(--text-muted);
}

.pricing-features li.con::before {
    content: '✕';
    color: var(--danger);
}

.pricing-features li.pro::before {
    content: '✓';
    color: var(--success);
}

.pricing-features li.highlight {
    color: var(--success);
    font-weight: 500;
}

.pricing-note {
    text-align: center;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Use Case Section - How to use together */
.use-case-section {
    margin-top: 48px;
    padding: 40px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 24px;
}

.use-case-header {
    text-align: center;
    margin-bottom: 32px;
}

.use-case-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0 0 8px;
}

.use-case-header p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 1rem;
}

.use-case-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.use-case-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    border-radius: 16px;
    transition: transform 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-4px);
}

.use-case-card.arcsign {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(99, 102, 241, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.use-case-card.hardware {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.12) 0%, rgba(251, 191, 36, 0.04) 100%);
    border: 1px solid rgba(251, 191, 36, 0.3);
}

.use-case-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.use-case-content h4 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin: 0 0 4px;
}

.use-case-product {
    font-size: 0.875rem;
    margin: 0 0 12px;
}

.use-case-card.arcsign .use-case-product {
    color: #818cf8;
}

.use-case-card.hardware .use-case-product {
    color: #fbbf24;
}

.use-case-benefits {
    list-style: none;
    padding: 0;
    margin: 0;
}

.use-case-benefits li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 4px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.use-case-benefits li::before {
    content: "✓";
    color: #10b981;
    font-size: 0.75rem;
    font-weight: 700;
}

.use-case-roadmap {
    text-align: center;
    padding: 20px 24px;
    background: rgba(139, 92, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.roadmap-badge {
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    color: #fff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.use-case-roadmap p {
    margin: 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

.use-case-roadmap strong {
    color: #c4b5fd;
}

@media (max-width: 768px) {
    .use-case-cards {
        grid-template-columns: 1fr;
    }

    .use-case-roadmap {
        flex-direction: column;
        gap: 12px;
    }
}

/* ===== Early Bird Section ===== */
.early-bird {
    padding: 80px 0;
    background: var(--gradient-hero);
    border-top: 1px solid rgba(99, 102, 241, 0.3);
    border-bottom: 1px solid rgba(99, 102, 241, 0.3);
}

.early-bird-content {
    text-align: center;
}

.early-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(245, 158, 11, 0.2);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 100px;
    color: var(--warning);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.early-bird h2 {
    margin-bottom: 40px;
}

.early-benefits {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
}

.benefit {
    display: flex;
    align-items: center;
    gap: 16px;
    text-align: left;
}

.benefit-icon {
    font-size: 2.5rem;
}

.benefit strong {
    display: block;
    font-size: 1rem;
}

.benefit p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

/* ===== FAQ Section ===== */
.faq {
    padding: 100px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: color 0.2s;
}

.faq-question:hover {
    color: var(--primary-light);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-bottom: 24px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.faq-answer strong {
    color: var(--text-primary);
}

/* ===== Download Section ===== */
.download {
    padding: 100px 0;
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.5) 0%, var(--bg-dark) 100%);
}

.download-content {
    text-align: center;
}

.download h2 {
    margin-bottom: 16px;
}

.download > .container > p {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 24px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.download-btn:hover:not(.disabled) {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.2);
}

.download-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.download-btn svg {
    width: 32px;
    height: 32px;
}

.download-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.download-platform {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
}

.download-note {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.download-trust {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.trust-item {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 8px 16px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 100px;
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 24px;
    border-top: 1px solid var(--border-color);
}

.footer-mission {
    text-align: center;
    padding: 24px 32px;
    margin-bottom: 40px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-lg);
}

.footer-mission h4 {
    color: var(--primary-light);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.footer-mission p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 16px;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-column a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 6px 0;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a:hover {
    color: var(--text-primary);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin: 0 auto 32px;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .problem-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .pricing-card.featured {
        transform: none;
    }

    .solution-comparison {
        flex-direction: column;
    }

    .comparison-vs {
        padding: 16px 0;
    }

    .flow-steps {
        flex-wrap: wrap;
    }

    .flow-arrow {
        display: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand p {
        margin: 16px auto 0;
    }

    .footer-links {
        justify-items: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-mobile {
        display: block;
    }

    .problem-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

    .early-benefits {
        flex-direction: column;
        align-items: center;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
    }
}

/* ===== For Everyone Section ===== */
.for-everyone {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(99, 102, 241, 0.03) 50%, var(--bg-dark) 100%);
}

.everyone-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 48px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.everyone-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8) 0%, rgba(30, 41, 59, 0.4) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    padding: 32px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: all 0.3s ease;
}

.everyone-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.2);
    background: linear-gradient(135deg, rgba(30, 41, 59, 1) 0%, rgba(30, 41, 59, 0.6) 100%);
}

.everyone-icon {
    font-size: 2.5rem;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    border-radius: 16px;
    flex-shrink: 0;
}

.everyone-card-content {
    flex: 1;
}

.everyone-card h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.everyone-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 0;
}

.everyone-mission {
    margin-top: 48px;
    padding: 32px 40px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 24px;
    text-align: center;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.everyone-mission p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    line-height: 1.8;
    margin: 0;
}

.everyone-mission strong {
    color: #fff;
    background: linear-gradient(135deg, #60a5fa, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

@media (max-width: 768px) {
    .everyone-grid {
        grid-template-columns: 1fr;
    }

    .everyone-card {
        padding: 24px;
    }
}