/* ================================
   Big Tech Roadmap - CSS
   ================================ */

:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-card-hover: #22222e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    /* Accent Colors */
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-pink: #ec4899;
    
    /* Company Colors */
    --uber: #000000;
    --uber-accent: #00d601;
    --microsoft: #00a4ef;
    --meta: #0668E1;
    --google: #EA4335;
    --amazon: #FF9900;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --gradient-card: linear-gradient(180deg, #1a1a24 0%, #12121a 100%);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ================================
   Reset & Base
   ================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    color: var(--accent-purple);
}

ul {
    list-style: none;
}

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

pre, code {
    font-family: 'Fira Code', monospace;
}

/* ================================
   Typography
   ================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ================================
   Navigation
   ================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-brand .logo {
    font-size: 1.5rem;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

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

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-3xl) var(--spacing-xl);
    padding-top: calc(var(--spacing-3xl) + 60px);
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 600px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

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

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

.code-block {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.code-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.code-header .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-header .dot.red { background: #ff5f56; }
.code-header .dot.yellow { background: #ffbd2e; }
.code-header .dot.green { background: #27c93f; }

.code-title {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.code-block pre {
    padding: var(--spacing-lg);
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.8;
}

.code-block code {
    color: var(--text-secondary);
}

.code-block .keyword { color: #c678dd; }
.code-block .string { color: #98c379; }
.code-block .number { color: #d19a66; }
.code-block .function { color: #61afef; }
.code-block .property { color: #e06c75; }

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    color: white;
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-small {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--accent-blue);
    color: white;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-small:hover {
    background: var(--accent-purple);
    color: white;
}

.btn-company {
    display: block;
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-md);
    font-weight: 500;
}

.btn-company:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

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

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* ================================
   Timeline
   ================================ */

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-blue), var(--accent-purple));
}

.timeline-item {
    position: relative;
    padding-left: 70px;
    padding-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 0;
    width: 50px;
    height: 50px;
    background: var(--bg-card);
    border: 3px solid var(--accent-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    z-index: 1;
}

.timeline-item:nth-child(2) .timeline-marker { border-color: var(--accent-purple); }
.timeline-item:nth-child(3) .timeline-marker { border-color: var(--accent-orange); }
.timeline-item:nth-child(4) .timeline-marker { border-color: var(--accent-green); }
.timeline-item:nth-child(5) .timeline-marker { border-color: var(--accent-red); }
.timeline-item:nth-child(6) .timeline-marker { border-color: var(--accent-pink); }

.timeline-content {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    background: var(--bg-card-hover);
    transform: translateX(5px);
    border-color: rgba(255, 255, 255, 0.1);
}

.phase-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent-blue);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    margin-bottom: var(--spacing-sm);
}

.timeline-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 0.5s ease;
}

/* ================================
   Companies Grid
   ================================ */

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

.companies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.company-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.company-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.company-card.uber:hover {
    border-color: var(--uber-accent);
    box-shadow: 0 0 30px rgba(0, 214, 1, 0.2);
}

.company-card.microsoft:hover {
    border-color: var(--microsoft);
    box-shadow: 0 0 30px rgba(0, 164, 239, 0.2);
}

.company-card.meta:hover {
    border-color: var(--meta);
    box-shadow: 0 0 30px rgba(6, 104, 225, 0.2);
}

.company-card.google:hover {
    border-color: var(--google);
    box-shadow: 0 0 30px rgba(234, 67, 53, 0.2);
}

.company-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

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

.company-topics {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.company-topics li {
    color: var(--text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
}

.company-topics li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
}

/* ================================
   Resources Grid
   ================================ */

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.resource-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.resource-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

.resource-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.resource-card h3 {
    margin-bottom: var(--spacing-md);
}

.resource-card ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.resource-card li {
    color: var(--text-secondary);
}

.resource-card a {
    color: var(--accent-blue);
    transition: color var(--transition-fast);
}

.resource-card a:hover {
    color: var(--accent-purple);
}

/* ================================
   Daily Routine
   ================================ */

.routine-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.routine-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.routine-card h4 {
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
}

.routine-card ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.routine-card li {
    color: var(--text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
}

.routine-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-purple);
}

.routine-card.highlight {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.1));
    border-color: rgba(139, 92, 246, 0.3);
}

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

.cta-section {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.1));
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.cta-content h2 {
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

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

.footer {
    padding: var(--spacing-xl);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer p {
    color: var(--text-secondary);
}

.footer-note {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

/* ================================
   Content Pages (Internal Pages)
   ================================ */

.page-header {
    padding: var(--spacing-3xl) var(--spacing-xl);
    padding-top: calc(var(--spacing-3xl) + 60px);
    background: var(--gradient-hero);
    text-align: center;
}

.page-header h1 {
    margin-bottom: var(--spacing-md);
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.page-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-xl);
}

/* ================================
   Topic Cards
   ================================ */

.topic-section {
    margin-bottom: var(--spacing-3xl);
}

.topic-section h2 {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.problem-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.problem-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.problem-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.problem-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.difficulty {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.difficulty.easy {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
}

.difficulty.medium {
    background: rgba(245, 158, 11, 0.2);
    color: var(--accent-orange);
}

.difficulty.hard {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
}

.problem-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.problem-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
}

.problem-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-blue);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.problem-link:hover {
    background: var(--accent-purple);
    color: white;
}

/* ================================
   Use Case Cards
   ================================ */

.use-case-card {
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.3);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.use-case-card h4 {
    color: var(--accent-purple);
    margin-bottom: var(--spacing-sm);
}

.use-case-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.use-case-example {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    color: var(--accent-green);
}

/* ================================
   Reference Links
   ================================ */

.reference-section {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
}

.reference-section h3 {
    margin-bottom: var(--spacing-md);
}

.reference-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.reference-list a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.reference-list a:hover {
    background: var(--bg-card-hover);
    transform: translateX(5px);
}

/* ================================
   Table of Contents
   ================================ */

.toc {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.toc h3 {
    margin-bottom: var(--spacing-md);
}

.toc-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toc-list a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toc-list a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* ================================
   Star Method Section
   ================================ */

.star-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border: 1px solid rgba(139, 92, 246, 0.3);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.star-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.star-step {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-md);
}

.star-step .letter {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.star-step h4 {
    margin: var(--spacing-sm) 0;
    color: var(--accent-blue);
}

.star-step p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ================================
   Question Bank Table
   ================================ */

.question-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.question-table th,
.question-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.question-table th {
    background: rgba(0, 0, 0, 0.3);
    font-weight: 600;
    color: var(--accent-blue);
}

.question-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.question-table .topic-cell {
    color: var(--text-secondary);
}

.question-table .company-cell {
    font-size: 0.875rem;
}

.question-table .link-cell a {
    color: var(--accent-blue);
}

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

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero-visual {
        margin-top: var(--spacing-xl);
    }
    
    .code-block {
        max-width: 100%;
        overflow-x: auto;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        padding: var(--spacing-lg);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .timeline::before {
        left: 16px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-marker {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .companies-grid,
    .resources-grid,
    .routine-grid {
        grid-template-columns: 1fr;
    }
    
    .problems-grid {
        grid-template-columns: 1fr;
    }
    
    .question-table {
        display: block;
        overflow-x: auto;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
}

@media (max-width: 480px) {
    section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .cta-buttons {
        flex-direction: column;
    }
}