:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #141418;
    --bg-tertiary: #1a1a1f;
    --border-color: #2a2a2f;
    --text-primary: #e5e5e5;
    --text-secondary: #a0a0a5;
    --text-muted: #6b6b70;
    --accent-primary: #22d3ee;
    --accent-secondary: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
nav {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    transition: background 0.3s ease;
}

nav.scrolled {
    background: rgba(10, 10, 11, 0.95);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.logo svg {
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
}

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

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.github-link:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 8rem 0 6rem;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 50% 0%, rgba(34, 211, 238, 0.1) 0%, transparent 50%),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(34, 211, 238, 0.03) 2px, rgba(34, 211, 238, 0.03) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(34, 211, 238, 0.03) 2px, rgba(34, 211, 238, 0.03) 4px);
    background-size: 100% 100%, 50px 50px, 50px 50px;
    opacity: 0.5;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(34, 211, 238, 0.1);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.description {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.button.primary {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.button.primary:hover {
    background: #1fc6dd;
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(34, 211, 238, 0.2);
}

.button.secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.button.secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Terminal Demo */
.terminal-demo {
    background: var(--bg-tertiary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.terminal-header {
    background: var(--bg-secondary);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.terminal-buttons {
    display: flex;
    gap: 0.5rem;
}

.terminal-button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-button.red {
    background: #ef4444;
}

.terminal-button.yellow {
    background: #f59e0b;
}

.terminal-button.green {
    background: #10b981;
}

.terminal-title {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.terminal-body {
    padding: 1.5rem;
    font-family: 'JetBrains Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    min-height: 300px;
    color: var(--text-secondary);
}

.terminal-line {
    margin-bottom: 0.25rem;
}

.terminal-prompt {
    color: var(--accent-primary);
}

.terminal-command {
    color: var(--text-primary);
}

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

.terminal-success {
    color: var(--accent-secondary);
}

.terminal-warning {
    color: var(--accent-warning);
}

.terminal-cursor {
    display: inline-block;
    width: 8px;
    height: 16px;
    background: var(--accent-primary);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    50.01%, 100% { opacity: 0; }
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section.dark {
    background: var(--bg-secondary);
}

.section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
    line-height: 1.7;
}

/* Problem Section */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.problem-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.problem-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.problem-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.problem-conclusion {
    text-align: center;
    font-size: 1.0625rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
}

/* Architecture Diagram */
.diagram-container {
    background: var(--bg-tertiary);
    padding: 3rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.architecture-diagram {
    width: 100%;
    height: auto;
    max-width: 720px;
    margin: 0 auto;
    display: block;
}

.diagram-caption {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9375rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Security Section */
.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.security-card {
    background: var(--bg-tertiary);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.security-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.security-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.security-card code {
    background: var(--bg-secondary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    color: var(--accent-primary);
}

.security-note {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Installation Section */
.install-steps {
    max-width: 700px;
    margin: 0 auto;
}

.install-step {
    margin-bottom: 2.5rem;
}

.install-step h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.code-block {
    position: relative;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
}

.code-block pre {
    margin: 0;
    overflow-x: auto;
}

.code-block code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9375rem;
    color: var(--accent-primary);
}

.copy-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-button:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.copy-button.copied {
    color: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

.install-note {
    background: rgba(34, 211, 238, 0.05);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.install-note p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.install-note strong {
    color: var(--text-primary);
}

/* GitHub Card */
.github-card {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 4rem 3rem;
    text-align: center;
}

.github-card h2 {
    margin-bottom: 1rem;
}

.github-card p {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
}

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

.footer-left p {
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
}

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

/* Responsive Design */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    h1 {
        font-size: 2.75rem;
    }
    
    .terminal-demo {
        max-width: 600px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav-content {
        padding: 1rem 1.5rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-links a {
        font-size: 0.875rem;
    }
    
    .hero {
        padding: 5rem 0 4rem;
    }
    
    h1 {
        font-size: 2.25rem;
    }
    
    .subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .button {
        width: 100%;
        justify-content: center;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .section h2 {
        font-size: 2rem;
    }
    
    .problem-grid,
    .security-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.875rem;
    }
    
    .terminal-body {
        font-size: 0.75rem;
        padding: 1rem;
    }
    
    .github-link span {
        display: none;
    }
}