:root {
    --bg-main: #0B0F19;
    --bg-card: rgba(18, 24, 38, 0.75);
    --bg-card-hover: rgba(26, 35, 55, 0.85);
    --primary: #3B82F6;
    --primary-glow: rgba(59, 130, 246, 0.35);
    --accent-emerald: #10B981;
    --accent-gold: #F59E0B;
    --text-main: #F9FAFB;
    --text-muted: #9CA3AF;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(59, 130, 246, 0.4);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 60%, rgba(16, 185, 129, 0.06) 0%, transparent 45%);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Nav */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    background: rgba(11, 15, 25, 0.8);
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-main);
}

.logo-badge {
    background: linear-gradient(135deg, #2563EB, #1D4ED8);
    color: white;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    letter-spacing: 0.5px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

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

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #3B82F6, #1D4ED8);
    color: white;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.5);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

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

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

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

/* Hero Section */
.hero {
    padding: 90px 0 60px;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid var(--border-highlight);
    color: #60A5FA;
    font-size: 13px;
    font-weight: 600;
    border-radius: 9999px;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: -1.2px;
    max-width: 820px;
    margin: 0 auto 20px;
    line-height: 1.15;
    background: linear-gradient(180deg, #FFFFFF 20%, #A5B4FC 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 17px;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 36px;
}

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

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 960px;
    margin: 0 auto;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 24px 16px;
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.stat-num {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Services */
.services {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 620px;
    margin: 0 auto 48px;
}

.section-tag {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent-emerald);
    display: block;
    margin-bottom: 8px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.8px;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 15px;
}

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

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all 0.3s ease;
}

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

.service-icon {
    font-size: 32px;
    margin-bottom: 18px;
}

.service-card h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 10px;
}

.service-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
}

/* Calculator */
.calculator-section {
    padding: 60px 0 80px;
}

.calculator-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    backdrop-filter: blur(12px);
}

.calc-inputs {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group label {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.val-highlight {
    color: #60A5FA;
}

input[type="range"] {
    width: 100%;
    accent-color: #3B82F6;
    cursor: pointer;
}

.calc-results {
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-md);
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

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

.result-label {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-value {
    font-size: 40px;
    font-weight: 800;
    color: var(--accent-emerald);
    letter-spacing: -1px;
    margin-top: 6px;
}

.result-breakdown {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--text-muted);
}

.breakdown-item strong {
    color: var(--text-main);
}

.text-green {
    color: var(--accent-emerald) !important;
}

/* API Demo Card */
.api-demo {
    padding: 30px 0 60px;
}

.api-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.api-info h4 {
    font-size: 15px;
    font-weight: 600;
}

.api-info p {
    font-size: 13px;
    color: var(--text-muted);
}

.api-result {
    margin-top: 14px;
    padding: 12px 18px;
    background: #0f172a;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 12px;
    color: #38bdf8;
    border: 1px solid var(--border-color);
}

.hidden {
    display: none;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 36px 0;
    font-size: 13px;
    color: var(--text-muted);
}

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

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--text-main);
}

@media (max-width: 860px) {
    .hero-title { font-size: 36px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: 1fr; }
    .calculator-card { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; gap: 16px; text-align: center; }
}