:root {
    --color-bg-primary: #0a0e17;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1a2236;
    --color-bg-card: #161e2e;
    --color-text-primary: #e8edf5;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;
    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #6366f1;
    --color-accent-tertiary: #8b5cf6;
    --color-accent-glow: rgba(59, 130, 246, 0.25);
    --color-border: #1f2937;
    --color-border-light: #374151;
    --color-code-bg: #0f172a;
    --color-code-keyword: #c084fc;
    --color-code-string: #6ee7b7;
    --color-code-prop: #93c5fd;
    --color-code-name: #f9a8d4;
    --color-white: #ffffff;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --max-width: 1200px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ===== HEADER & NAV ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(10, 14, 23, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text-primary);
    text-decoration: none;
}
.brand-link:hover {
    color: var(--color-text-primary);
}

.brand-icon {
    font-size: 22px;
    color: var(--color-accent-primary);
    line-height: 1;
}

.brand-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}
.nav-links a:hover {
    color: var(--color-text-primary);
}

/* ===== HERO ===== */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 100px 24px 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    min-height: calc(100vh - 68px);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-light);
    border-radius: 50px;
    padding: 6px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 28px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-accent-primary);
    box-shadow: 0 0 8px var(--color-accent-glow);
}

.hero-title {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin-bottom: 24px;
}

.hero-title-accent {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-tertiary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.75;
    max-width: 520px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-accent-primary);
    color: var(--color-white);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover {
    background-color: #2563eb;
    color: var(--color-white);
    box-shadow: 0 6px 28px rgba(59, 130, 246, 0.45);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1.5px solid var(--color-border-light);
}
.btn-outline:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    background-color: rgba(59, 130, 246, 0.06);
}

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

.stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

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

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 100%;
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-pattern {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 480px;
    max-height: 480px;
}

.pattern-node {
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-accent-primary);
    box-shadow: 0 0 20px var(--color-accent-glow), 0 0 40px rgba(59, 130, 246, 0.15);
}

.pattern-node-1 { top: 10%; left: 10%; }
.pattern-node-2 { top: 20%; right: 15%; background-color: var(--color-accent-secondary); box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
.pattern-node-3 { bottom: 25%; left: 20%; }
.pattern-node-4 { bottom: 15%; right: 10%; background-color: var(--color-accent-tertiary); box-shadow: 0 0 20px rgba(139, 92, 246, 0.3); }
.pattern-node-5 { top: 50%; left: 50%; width: 20px; height: 20px; transform: translate(-50%, -50%); }

.pattern-line {
    position: absolute;
    background-color: var(--color-border-light);
    opacity: 0.5;
}

.pattern-line-1 { top: 13%; left: 13%; width: 160px; height: 1px; transform: rotate(30deg); }
.pattern-line-2 { top: 23%; right: 13%; width: 140px; height: 1px; transform: rotate(-25deg); }
.pattern-line-3 { bottom: 28%; left: 13%; width: 170px; height: 1px; transform: rotate(15deg); }
.pattern-line-4 { bottom: 13%; right: 13%; width: 150px; height: 1px; transform: rotate(-20deg); }
.pattern-line-5 { top: 38%; left: 30%; width: 200px; height: 1px; transform: rotate(50deg); }
.pattern-line-6 { top: 50%; left: 15%; width: 280px; height: 1px; transform: rotate(-10deg); }

/* ===== SECTIONS ===== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-accent-primary);
    margin-bottom: 14px;
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ===== SERVICES ===== */
.services {
    padding: 100px 24px;
    background-color: var(--color-bg-secondary);
}

.services-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: border-color 0.3s ease, transform 0.3s ease;
}
.service-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
}

.service-icon {
    color: var(--color-accent-primary);
    margin-bottom: 24px;
}

.service-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.service-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.65;
    margin-bottom: 20px;
}

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

.service-list li {
    font-size: 13px;
    color: var(--color-text-muted);
    padding-left: 18px;
    position: relative;
}
.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-accent-primary);
    opacity: 0.6;
}

/* ===== ABOUT ===== */
.about {
    padding: 100px 24px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .section-tag {
    margin-bottom: 14px;
}

.about-text {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.75;
    margin-bottom: 16px;
}

.about-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
}

/* About Visual Card */
.about-card {
    background-color: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.about-card-header {
    background-color: var(--color-bg-tertiary);
    padding: 12px 16px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--color-border);
}

.about-card-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-border-light);
}
.about-card-dot:first-child {
    background-color: #ef4444;
}
.about-card-dot:nth-child(2) {
    background-color: #f59e0b;
}
.about-card-dot:nth-child(3) {
    background-color: #22c55e;
}

.about-card-body {
    padding: 28px;
}

.code-block {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.9;
    color: var(--color-text-secondary);
}

.code-line {
    display: block;
}

.code-keyword {
    color: var(--color-code-keyword);
    font-weight: 600;
}

.code-string {
    color: var(--color-code-string);
}

.code-prop {
    color: var(--color-code-prop);
}

.code-name {
    color: var(--color-code-name);
    font-weight: 600;
}

/* ===== APPROACH ===== */
.approach {
    padding: 100px 24px;
    background-color: var(--color-bg-secondary);
}

.approach-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.approach-step {
    display: flex;
    gap: 28px;
    position: relative;
}

.approach-step + .approach-step {
    margin-top: 0;
}

.step-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
    position: relative;
}

.step-number {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-bg-tertiary);
    border: 2px solid var(--color-accent-primary);
    color: var(--color-accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    font-family: var(--font-mono);
    flex-shrink: 0;
    z-index: 1;
}

.step-line {
    width: 2px;
    flex: 1;
    min-height: 64px;
    background: linear-gradient(to bottom, var(--color-accent-primary), var(--color-border));
}

.step-line-end {
    width: 2px;
    flex: 1;
    min-height: 64px;
    background: linear-gradient(to bottom, var(--color-accent-primary), transparent);
}

.step-content {
    padding-top: 8px;
    padding-bottom: 32px;
}

.step-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.step-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== CONTACT ===== */
.contact {
    padding: 100px 24px;
    max-width: var(--max-width);
    margin: 0 auto;
}

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

.contact-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: border-color 0.3s ease;
}
.contact-card:hover {
    border-color: var(--color-border-light);
}

.contact-card-icon {
    color: var(--color-accent-primary);
}

.contact-card-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.contact-card-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
}

.contact-card-value {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
    word-break: break-all;
}
a.contact-card-value:hover {
    color: var(--color-accent-primary);
}

.contact-card-address {
    font-size: 14px;
    font-style: normal;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 64px 24px 32px;
}

.footer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .brand-icon {
    font-size: 20px;
}

.footer-brand .brand-text {
    font-size: 18px;
    font-weight: 700;
    display: inline;
    margin-left: 8px;
    vertical-align: middle;
}

.footer-tagline {
    margin-top: 12px;
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.footer-heading {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.footer-links ul,
.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a,
.footer-contact a {
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}
.footer-links a:hover,
.footer-contact a:hover {
    color: var(--color-accent-primary);
}

.footer-contact address {
    font-size: 14px;
    font-style: normal;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-text-muted);
}

.footer-dev {
    color: var(--color-text-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 60px 24px 60px;
        min-height: auto;
    }

    .hero-visual {
        display: none;
    }

    .services-grid {
        grid-template-columns: 1fr;
        max-width: 560px;
        margin: 0 auto;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        gap: 18px;
    }
    .nav-links a {
        font-size: 13px;
    }

    .hero-stats {
        gap: 28px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 12px;
    }
    .nav-links a {
        font-size: 12px;
    }

    .hero-actions {
        flex-direction: column;
    }
    .btn {
        width: 100%;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
}