/* ============================================
   CertAuto - Main Stylesheet
   Production-Ready Professional Design
   ============================================ */

:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #a855f7;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-dark: #111827;
    --bg-darker: #0f172a;
    
    /* Text */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --text-light: #d1d5db;
    --text-lighter: #e5e7eb;
    
    /* Borders */
    --border-color: #e5e7eb;
    --border-dark: #d1d5db;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-base: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-tooltip: 1100;
    --z-navbar: 999;
}

/* ============================================
   Global Styles
   ============================================ */

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-base);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--space-base);
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

code, pre {
    font-family: var(--font-mono);
}

code {
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875em;
}

pre {
    background-color: var(--bg-dark);
    color: #e5e7eb;
    padding: var(--space-base);
    border-radius: var(--space-sm);
    overflow-x: auto;
    margin-bottom: var(--space-lg);
}

pre code {
    background: none;
    color: inherit;
    padding: 0;
    font-size: 0.875rem;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* ============================================
   Navbar
   ============================================ */

.navbar {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: var(--z-navbar);
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 70px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-base);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.navbar-brand:hover {
    color: var(--primary-color);
}

.logo-image {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    object-fit: contain;
    transition: transform var(--transition-normal);
}

.navbar-brand:hover .logo-image {
    transform: scale(1.05);
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width var(--transition-normal);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: 0.5rem;
}

.nav-link.cta::after {
    display: none;
}

.nav-link.cta:hover {
    color: white;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 70px);
    padding: var(--space-3xl) var(--space-xl);
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.gradient-blob {
    position: absolute;
    filter: blur(80px);
    opacity: 0.4;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    top: -10%;
    left: -10%;
    animation: blob1-animation 15s ease-in-out infinite;
}

.blob-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #ec4899, #f59e0b);
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    bottom: -10%;
    right: -10%;
    animation: blob2-animation 20s ease-in-out infinite;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.gradient-text {
    display: block;
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text-alt {
    display: block;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: var(--space-base);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
    padding-top: var(--space-base);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.certificate-animation {
    width: 300px;
    height: 360px;
    animation: float 6s ease-in-out infinite;
}

.certificate-animation svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 20px 40px rgba(99, 102, 241, 0.2));
}

.cert-border {
    animation: pulse-border 3s ease-in-out infinite;
}

.seal-rotate {
    animation: rotate 4s linear infinite;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: var(--font-size-base);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

/* ============================================
   Sections
   ============================================ */

section {
    padding: var(--space-3xl) var(--space-xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    text-align: center;
    margin-bottom: var(--space-base);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--space-3xl);
}

/* ============================================
   Features Section
   ============================================ */

.features {
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-2xl);
}

.feature-card {
    background: var(--bg-secondary);
    padding: var(--space-2xl);
    border-radius: var(--space-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--space-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
    background: var(--bg-primary);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--space-base);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.5;
}

.feature-card h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--text-secondary);
    margin: 0;
    font-size: var(--font-size-base);
}

/* ============================================
   Architecture Section
   ============================================ */

.architecture {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.architecture-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.architecture-diagram {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--space-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.arch-component {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xl);
    border-radius: var(--space-base);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    transition: all var(--transition-normal);
}

.arch-component.arch-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
}

.arch-component:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.arch-icon {
    font-size: 2rem;
}

.arch-label {
    font-weight: 600;
    font-size: var(--font-size-base);
}

.arch-description {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.arch-connector {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-color);
}

.arch-flow {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-base);
}

.flow-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-base);
    background: white;
    border-radius: var(--space-sm);
    border: 1px solid var(--border-color);
    text-align: center;
}

.flow-icon {
    font-size: 1.5rem;
}

.flow-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.architecture-details h3 {
    color: var(--text-primary);
    margin-top: var(--space-2xl);
}

.component-list,
.workflow-list {
    columns: 1;
    gap: var(--space-base);
    padding-left: 0;
}

.component-list li,
.workflow-list li {
    background: white;
    padding: var(--space-base);
    border-radius: var(--space-sm);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--space-base);
    color: var(--text-secondary);
}

.component-list strong,
.workflow-list strong {
    color: var(--text-primary);
}

/* ============================================
   Quick Start Section
   ============================================ */

.quickstart {
    background: white;
}

.quickstart-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-3xl);
}

.quickstart-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.step {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.step-content h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-lg);
}

.step-content p {
    margin-bottom: var(--space-base);
    color: var(--text-secondary);
}

.step-content pre {
    background-color: var(--bg-dark);
    color: #e5e7eb;
    padding: var(--space-base);
    border-radius: var(--space-sm);
    overflow-x: auto;
    font-size: 0.8rem;
}

.quickstart-box {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    padding: var(--space-2xl);
    border-radius: var(--space-lg);
    border: 1px solid var(--border-color);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.quickstart-box h3 {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.quickstart-box p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.link-list {
    list-style: none;
    padding: 0;
}

.link-list li {
    margin-bottom: var(--space-sm);
}

.link-list a {
    display: inline-block;
    padding: 0.5rem 0;
    color: var(--primary-color);
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.link-list a:hover {
    border-bottom-color: var(--primary-color);
}

/* ============================================
   Documentation Section
   ============================================ */

.documentation {
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
}

.doc-card {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--space-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--space-base);
}

.doc-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.doc-card h3 {
    color: var(--text-primary);
    margin-bottom: 0;
}

.doc-card p {
    flex-grow: 1;
    color: var(--text-secondary);
}

.doc-link {
    color: var(--secondary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.doc-link:hover {
    gap: 0.75rem;
}

/* ============================================
   Contributors Section
   ============================================ */

.contributors {
    background: white;
}

.contributors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
}

.contributor-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    padding: var(--space-2xl);
    border-radius: var(--space-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--space-base);
}

.contributor-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.contributor-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    color: white;
    font-weight: 700;
    font-size: var(--font-size-2xl);
}

.contributor-name {
    color: var(--text-primary);
    margin: 0;
}

.contributor-role {
    color: var(--primary-color);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0;
}

.contributor-bio {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.contributor-links {
    display: flex;
    justify-content: center;
    gap: var(--space-base);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.social-link:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

.contribution-info {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--space-3xl);
    border-radius: var(--space-lg);
    text-align: center;
}

.contribution-info h3 {
    color: white;
    margin-bottom: var(--space-base);
}

.contribution-info p {
    color: rgba(255, 255, 255, 0.9);
}

.contribution-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    margin: var(--space-2xl) 0;
    text-align: left;
}

.contrib-type {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-xl);
    border-radius: var(--space-base);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contrib-type h4 {
    color: white;
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-base);
}

.contrib-type p {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    font-size: var(--font-size-sm);
}

.contribution-info .btn {
    margin-top: var(--space-xl);
}

/* ============================================
   Tech Stack Section
   ============================================ */

.tech-stack {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
}

.tech-item {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--space-base);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.tech-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.tech-name {
    font-weight: 700;
    color: var(--text-primary);
}

.tech-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
}

.cta-section h2 {
    color: white;
    margin-bottom: var(--space-base);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

.cta-buttons {
    display: flex;
    gap: var(--space-base);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-buttons .btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.cta-buttons .btn-primary:hover {
    color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.cta-buttons .btn-secondary {
    border-color: white;
    color: white;
}

.cta-buttons .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--space-3xl) var(--space-xl) var(--space-xl);
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-column h4 {
    color: white;
    margin-bottom: var(--space-base);
}

.footer-column p {
    color: var(--text-light);
    margin: 0;
    font-size: var(--font-size-sm);
}

.footer-column ul {
    list-style: none;
    padding: 0;
}

.footer-column ul li {
    margin-bottom: var(--space-sm);
}

.footer-column a {
    color: var(--text-light);
    transition: color var(--transition-normal);
    font-size: var(--font-size-sm);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-2xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-xl);
}

.footer-bottom p {
    margin: 0;
    color: var(--text-light);
    font-size: var(--font-size-sm);
}

.footer-badges {
    display: flex;
    gap: var(--space-base);
}

.badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 2rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .navbar-container {
        padding: 0 var(--space-base);
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--space-xl) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-visual {
        margin-top: var(--space-xl);
    }
    
    .architecture-content {
        grid-template-columns: 1fr;
    }
    
    .quickstart-content {
        grid-template-columns: 1fr;
    }
    
    .quickstart-box {
        position: relative;
        top: auto;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-base);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 640px) {
    :root {
        --space-xl: 1.5rem;
        --space-3xl: 2rem;
    }
    
    section {
        padding: var(--space-2xl) var(--space-base);
    }
    
    .container {
        padding: 0 var(--space-base);
    }
    
    .hero {
        padding: var(--space-2xl) var(--space-base);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .features-grid,
    .docs-grid,
    .contributors-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        grid-template-columns: 50px 1fr;
        gap: var(--space-base);
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-lg);
    }
    
    .contribution-types {
        grid-template-columns: 1fr;
    }
}