/* ============================================
   RidgetopAI Landing Page Styles
   Terminal Elegance + Infrastructure Diagram
   ============================================ */

/* CSS Variables */
:root {
    --bg: #0D1117;
    --surface: #161B22;
    --border: #30363D;
    --text: #E6EDF3;
    --text-muted: #8B949E;
    --text-dim: #484F58;
    --accent: #58A6FF;
    --accent-green: #7EE787;
    --code: #F0883E;

    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --max-width: 1200px;
    --border-radius: 8px;
}

/* Skip Link - Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent);
    color: var(--bg);
    padding: var(--spacing-sm);
    z-index: 100;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 18px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}

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

a:hover {
    color: var(--text);
}

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

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 4px;
    filter: invert(1);
}

.logo-text {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.1rem;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav a {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.nav a:hover {
    background: var(--surface);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.hero h1 {
    font-family: var(--font-mono);
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.3;
    max-width: 800px;
}

.hero h1 .accent {
    color: var(--accent);
}

.hero-sub {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-muted);
    max-width: 600px;
}

.scroll-hint {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-dim);
    font-size: 0.85rem;
    animation: float 2s ease-in-out infinite;
}

.scroll-hint svg {
    width: 20px;
    height: 20px;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

/* Section Title */
.section-title {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* Infrastructure Diagram Section */
.diagram-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: linear-gradient(180deg, transparent 0%, var(--surface) 50%, transparent 100%);
}

.diagram-container {
    max-width: 900px;
    margin: 0 auto;
}

.infrastructure-diagram {
    width: 100%;
    height: auto;
}

/* SVG Diagram Styles */
.layer-bg {
    fill: var(--surface);
    stroke: var(--border);
    stroke-width: 1;
}

.layer-label {
    fill: var(--text-dim);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
}

.node-bg {
    fill: var(--bg);
    stroke: var(--border);
    stroke-width: 1.5;
    transition: stroke 0.2s ease, fill 0.2s ease;
}

.node:hover .node-bg {
    stroke: var(--accent);
    fill: var(--surface);
}

.node-title {
    fill: var(--text);
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 700;
    text-anchor: middle;
}

.node-subtitle {
    fill: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 11px;
    text-anchor: middle;
}

.connection-line {
    stroke: var(--border);
    stroke-width: 2;
}

.flow-line {
    stroke: var(--accent);
    stroke-opacity: 0.4;
    stroke-dasharray: 4 4;
}

/* Mobile Diagram */
.diagram-mobile {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
}

.mobile-layer {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    width: 100%;
    max-width: 300px;
    text-align: center;
}

.mobile-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    margin-bottom: var(--spacing-xs);
}

.mobile-nodes {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs);
}

.mobile-node {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    background: var(--bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    border: 1px solid var(--border);
}

.mobile-arrow {
    font-size: 1.5rem;
    color: var(--accent);
    opacity: 0.5;
}

/* Projects Section */
.projects {
    padding: var(--spacing-2xl) var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Project Cards */
.project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.project-card:hover {
    transform: translateY(-2px);
    border-color: var(--text-dim);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.project-name {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
}

.project-layer {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: rgba(88, 166, 255, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.project-tagline {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--text);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.stat {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.stat-value {
    color: var(--code);
    font-weight: 700;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tech-badge {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--bg);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.project-highlight {
    font-size: 0.95rem;
    color: var(--accent-green);
    border-left: 3px solid var(--accent-green);
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.project-link {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    transition: gap 0.2s ease;
}

.project-link:hover {
    gap: 0.5rem;
}

/* Footer */
.footer {
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-name {
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.footer-nav {
    display: flex;
    gap: var(--spacing-md);
}

.footer-nav a {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
}

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

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-dim);
    text-align: center;
    margin-top: var(--spacing-xs);
}

/* Fade-in Animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */

/* Tablet */
@media (max-width: 1024px) {
    .diagram-container {
        max-width: 100%;
        overflow-x: auto;
    }
}

/* Mobile */
@media (max-width: 640px) {
    body {
        font-size: 16px;
    }

    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .logo-text {
        display: none;
    }

    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
        min-height: 50vh;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero h1 br {
        display: none;
    }

    .diagram-container {
        display: none;
    }

    .diagram-mobile {
        display: flex;
    }

    .projects {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .project-card {
        padding: var(--spacing-md);
    }

    .project-name {
        font-size: 1.25rem;
    }

    .project-stats {
        gap: var(--spacing-sm);
    }

    .stat {
        font-size: 0.85rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Reduced Motion - Accessibility */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .project-card {
        transition: none;
    }

    .scroll-hint {
        animation: none;
    }

    .nav a, a, .project-link {
        transition: none;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }

    .header, .footer, .scroll-hint, .diagram-section {
        display: none;
    }

    .project-card {
        break-inside: avoid;
        border: 1px solid #ccc;
    }
}