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

:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-primary-light: #7dd3fc;
    --color-primary-50: #f0f9ff;
    --color-primary-100: #e0f2fe;
    --color-primary-200: #bae6fd;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-card: #ffffff;
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-code-bg: #0f172a;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
    --transition: 0.2s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 105px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    text-wrap: balance;
}

p {
    text-wrap: pretty;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* === Launch Banner === */
.launch-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1001;
    background: linear-gradient(90deg, var(--color-primary) 0%, #6366f1 100%);
    color: #fff;
    text-align: center;
    padding: 10px 24px;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.launch-banner strong {
    font-weight: 700;
}

.launch-banner span {
    margin-right: 4px;
}

/* === Navigation === */
.navbar {
    position: fixed;
    top: 38px;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    transition: var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.nav-logo {
    width: 32px;
    height: 32px;
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition);
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.4);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--color-border);
    color: var(--color-text-secondary);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-50);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    color: var(--color-primary);
    background: var(--color-primary-50);
}

/* === Hero Section === */
.hero {
    position: relative;
    padding: 180px 0 80px;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 80% 60% at 50% 0%, var(--color-primary-100) 0%, transparent 70%),
        radial-gradient(ellipse 40% 40% at 80% 20%, rgba(14, 165, 233, 0.05) 0%, transparent 60%);
    z-index: -1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    padding: 4px 4px 4px 4px;
    border-radius: 100px;
    background: var(--color-primary-50);
    border: 1px solid var(--color-primary-200);
}

.badge {
    background: var(--color-primary);
    color: #fff;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge-text {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    padding-right: 12px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, #6366f1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    max-width: 640px;
    margin: 0 auto 32px;
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 56px;
}

.hero-code {
    max-width: 580px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    text-align: left;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: #1e293b;
}

.code-dots {
    display: flex;
    gap: 6px;
}

.code-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #334155;
}

.code-dots span:first-child { background: #ef4444; }
.code-dots span:nth-child(2) { background: #f59e0b; }
.code-dots span:last-child { background: #10b981; }

.code-title {
    font-size: 0.78rem;
    color: #94a3b8;
    font-weight: 500;
}

.hero-code pre {
    padding: 24px;
    background: var(--color-code-bg);
    margin: 0;
    overflow-x: auto;
}

.hero-code code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    color: #e2e8f0;
}

.code-comment { color: #64748b; }
.code-prompt { color: var(--color-primary-light); }

/* === Platforms === */
.platforms {
    padding: 48px 0;
    border-bottom: 1px solid var(--color-border-light);
}

.platforms-label {
    text-align: center;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 20px;
}

.platforms-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.platform-item {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
}

/* === Section Headers === */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 12px;
    padding: 4px 12px;
    background: var(--color-primary-50);
    border-radius: 100px;
    border: 1px solid var(--color-primary-200);
}

.section-header h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* === Features === */
.features {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

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

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

.feature-card:hover {
    border-color: var(--color-primary-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--color-primary-50);
    color: var(--color-primary);
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* === Architecture === */
.architecture {
    padding: 100px 0;
}

.arch-diagram {
    max-width: 700px;
    margin: 0 auto 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.arch-layer {
    width: 100%;
    padding: 20px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
}

.arch-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.arch-nodes {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.arch-node {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    background: var(--color-primary-50);
    border: 1px solid var(--color-primary-200);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text);
}

.arch-node-ui {
    background: var(--color-primary-50);
    border: 1px solid var(--color-primary-200);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
}

.arch-node-kafka {
    background: #fef3c7;
    border-color: #fcd34d;
}

.arch-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 32px;
}

.arch-scale-note {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    max-width: 700px;
    margin: 0 auto;
    padding: 24px;
    background: var(--color-primary-50);
    border: 1px solid var(--color-primary-200);
    border-radius: var(--radius-lg);
}

.arch-scale-note .scale-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--color-primary-100);
    color: var(--color-primary);
}

.arch-scale-note strong {
    font-size: 0.95rem;
}

.arch-scale-note p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin: 4px 0 8px;
}

.arch-scale-note code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    background: var(--color-primary-100);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    color: var(--color-primary-dark);
}

/* === Tech Stack === */
.tech-stack {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

.stack-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.stack-card {
    padding: 28px;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.stack-layer {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.stack-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.stack-items span {
    padding: 4px 12px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* === Workflow === */
.workflow {
    padding: 100px 0;
}

.workflow-steps {
    max-width: 640px;
    margin: 0 auto;
    position: relative;
}

.workflow-steps::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 24px;
    bottom: 24px;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary-200) 0%, var(--color-primary) 50%, var(--color-primary-200) 100%);
}

.workflow-step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 16px 0;
    position: relative;
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
    z-index: 1;
}

.step-content h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.step-content p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
}

/* === API Section === */
.api-section {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

.api-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.api-group {
    padding: 28px;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.api-group h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border-light);
}

.api-endpoint {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
}

.api-endpoint code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.method {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    flex-shrink: 0;
}

.method.post {
    background: #dbeafe;
    color: #1d4ed8;
}

.method.get {
    background: #dcfce7;
    color: #15803d;
}

/* === Services === */
.services {
    padding: 100px 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.service-card {
    padding: 20px 24px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.service-card:hover {
    border-color: var(--color-primary-200);
    background: var(--color-primary-50);
}

.service-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.service-desc {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* === CTA === */
.cta {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-primary-50) 100%);
}

.cta h2 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.cta p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

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

/* === Footer === */
.footer {
    padding: 64px 0 0;
    border-top: 1px solid var(--color-border);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-brand p {
    margin-top: 12px;
    font-size: 0.88rem;
    color: var(--color-text-muted);
    max-width: 280px;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col h5 {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    padding: 4px 0;
    transition: color var(--transition);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding: 20px 24px;
    border-top: 1px solid var(--color-border-light);
}

.footer-bottom p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .features-grid,
    .stack-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px 24px;
        gap: 12px;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .hero {
        padding: 140px 0 60px;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

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

    .features-grid,
    .stack-grid,
    .api-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }

    .platforms-grid {
        gap: 12px;
    }

    .platform-item {
        font-size: 0.85rem;
        padding: 6px 14px;
    }

    .footer-container {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 4px;
    }

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

    .arch-nodes {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-code {
        margin: 0 -12px;
        border-radius: var(--radius-md);
    }

    .hero-code pre {
        padding: 16px;
    }

    .hero-code code {
        font-size: 0.75rem;
    }
}

/* === Animations === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }