:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111927;
    --bg-card: rgba(23, 32, 51, 0.7);
    --bg-card-hover: rgba(30, 42, 68, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(0, 229, 255, 0.3);
    --text-primary: #f0f4fc;
    --text-secondary: #94a3b8;
    --accent-cyan: #00e5ff;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --gradient-hero: linear-gradient(135deg, #00e5ff 0%, #3b82f6 50%, #8b5cf6 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #67e8f9;
}

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

/* Header */
.site-header {
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 2px;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo-badge {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

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

.main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.main-nav a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

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

.nav-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-cyan);
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 100px 0 80px;
    background: radial-gradient(circle at 50% 10%, rgba(0, 229, 255, 0.12) 0%, transparent 60%);
    text-align: center;
}

.badge-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent-cyan);
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid rgba(0, 229, 255, 0.3);
    padding: 6px 14px;
    border-radius: 20px;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 720px;
    margin: 0 auto 36px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: #050811;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 229, 255, 0.3);
    color: #050811;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

/* Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(8px);
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--accent-cyan);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Sections */
.section {
    padding: 90px 0;
}

.section-dark {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
}

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

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.25s ease;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-highlight);
    transform: translateY(-4px);
}

.card-icon {
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 1.35rem;
    margin-bottom: 12px;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* AI Grid */
.ai-feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.ai-feature-item {
    background: var(--bg-card);
    border-left: 3px solid var(--accent-cyan);
    padding: 24px;
    border-radius: 0 12px 12px 0;
}

.ai-feature-item h4 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.ai-feature-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Packet Visualizer */
.packet-visualizer {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
}

.packet-flow {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 28px;
}

.packet-block {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.packet-block:hover, .packet-block.active {
    background: rgba(0, 229, 255, 0.12);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 16px rgba(0, 229, 255, 0.2);
}

.packet-block .block-title {
    font-weight: 700;
    font-size: 0.9rem;
}

.packet-block .block-size {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.inspector-box {
    background: rgba(10, 14, 23, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.inspector-box h3 {
    color: var(--accent-cyan);
    margin-bottom: 8px;
}

.inspector-box p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.specs-table th, .specs-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.specs-table th {
    color: var(--text-secondary);
    font-weight: 600;
}

/* Calculator */
.calc-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.form-group input, .form-group select {
    width: 100%;
    background: rgba(10, 14, 23, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 14px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

.form-group small {
    display: block;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 6px;
}

.calc-result {
    background: rgba(10, 14, 23, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.result-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.res-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.res-value {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.15rem;
}

.res-value.highlight {
    color: var(--accent-cyan);
}

.res-value.green {
    color: var(--accent-green);
}

/* Code Boxes & Reference */
.spec-list {
    list-style: none;
    margin-top: 16px;
}

.spec-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.spec-list li strong {
    color: var(--text-primary);
    display: inline-block;
    width: 170px;
}

.code-box {
    background: #050811;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    overflow-x: auto;
    color: #38bdf8;
    margin-top: 16px;
}

/* Footer */
.site-footer {
    background: #060910;
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
    margin-top: 60px;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-left p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 12px;
    max-width: 380px;
}

.footer-links h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--accent-cyan);
}

.copyright {
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-title { font-size: 2.5rem; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
    .packet-flow { grid-template-columns: 1fr; }
    .calc-container { grid-template-columns: 1fr; }
    .footer-container { grid-template-columns: 1fr; }
    .main-nav { display: none; }
}