/* ============================================
   DISPOSITION MANAGEMENT - DOCUMENTATION STYLES
   ============================================ */

/* Root Variables */
:root {
    --primary-color: #714B67;
    --primary-dark: #5d3d54;
    --secondary-color: #00A09D;
    --accent-color: #017E84;
    --success-color: #28a745;
    --warning-color:  #ffc107;
    --danger-color: #dc3545;
    
    --bg-primary: #F9F9F9;
    --bg-secondary:  #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-hover: #F0F0F0;
    
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    
    --border-color: #DEE2E6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.15);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.2);
    
    --sidebar-width: 280px;
    --header-height: 70px;
    
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: "Fira Code", "Courier New", monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background:  linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header Styles */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--primary-color);
    color: white;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--primary-dark);
    z-index: 1000;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display:  flex;
    align-items:  center;
    justify-content:  space-between;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-section i {
    font-size: 2rem;
    color: white;
}

.logo-section h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: white;
}

.version-badge {
    background: var(--primary-color);
    color: white;
    padding:  0.25rem 0.75rem;
    border-radius: 1rem;
    font-size:  0.75rem;
    font-weight:  600;
}

/* Main Navigation */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-weight: 500;
    transition:  color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: white;
}

.nav-link.active::after {
    content:  "";
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height:  2px;
    background: white;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top:  var(--header-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 2rem 0;
}

.sidebar-header {
    padding:  0 1.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.sidebar-header h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.sidebar-nav {
    list-style: none;
}

.nav-section > a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition:  all 0.3s ease;
}

.nav-section > a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    padding-left: 2rem;
}

.sub-nav {
    list-style: none;
    margin-top: 0.25rem;
}

.sub-nav a {
    display: block;
    padding: 0.5rem 1.5rem 0.5rem 2.5rem;
    color: var(--text-muted);
    text-decoration:  none;
    font-size:  0.875rem;
    transition: all 0.3s ease;
}

.sub-nav a:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    padding: 4rem 2rem;
    margin-bottom: 3rem;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.project-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.info-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 1rem;
    backdrop-filter: blur(10px);
}

.info-card i {
    font-size: 2rem;
    color: white;
    opacity: 0.9;
}

.info-card strong {
    display: block;
    font-size: 1.1rem;
}

.info-card span {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

/* Content Sections */
.content-section {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto 3rem;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 2rem;
    margin-bottom:  2rem;
    color:  var(--text-primary);
}

.section-number {
    background: var(--primary-color);
    color: white;
    width: 3rem;
    height: 3rem;
    border-radius:  50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.subsection {
    margin-bottom: 3rem;
}

.subsection h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Content Cards */
.content-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.highlight-card {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-hover));
    border-left: 4px solid var(--primary-color);
}

.icon-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom:  1rem;
}

.icon-header i {
    font-size: 2rem;
    color: var(--primary-color);
}

.role-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    margin-top: 1rem;
}

/* Analysis Grid */
.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.problem-card,
.solution-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.problem-card {
    border-left: 4px solid var(--danger-color);
}

.solution-card {
    border-left: 4px solid var(--success-color);
}

.problem-card i,
.solution-card i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.problem-card i {
    color: var(--danger-color);
}

.solution-card i {
    color: var(--success-color);
}

/* Timeline */
.timeline-container {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.timeline-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    text-align: center;
    padding: 1rem;
    background: var(--bg-hover);
    border-radius: 8px;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.timeline-info {
    display: flex;
    gap: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.timeline-info p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.timeline-info i {
    color: var(--primary-color);
}

/* Phases Timeline */
.phases-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    position: relative;
}

.phase-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.phase-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right:  0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.phase-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.phase-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.phase-number {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--primary-color);
}

.phase-hours {
    background: var(--bg-hover);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size:  0.875rem;
    color: var(--text-secondary);
}

.phase-card h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.phase-date {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

/* Phase Details */
.phase-detail {
    margin-bottom: 2rem;
}

.day-entry {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.day-header {
    background: var(--bg-hover);
    padding: 1rem 1.5rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.day-badge,
.date-badge,
.hours-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.day-badge {
    background: var(--primary-color);
    color: white;
}

.date-badge {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.hours-badge {
    background: var(--secondary-color);
    color: white;
}

.day-content {
    padding: 1.5rem;
}

.day-content h4 {
    margin-bottom:  1rem;
    color: var(--text-primary);
}

.day-content ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.day-content li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.day-content li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* Code Preview */
.code-preview {
    background: #1e1e1e;
    border-radius: 8px;
    overflow: hidden;
    margin-top: 1rem;
}

.code-preview pre {
    margin: 0;
    padding:  1rem;
    overflow-x: auto;
}

.code-preview code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Feature Tabs */
.feature-tabs {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
}

.tab-buttons {
    display: flex;
    background: var(--bg-hover);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    background: none;
    border: none;
    color:  var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

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

.tab-btn.active {
    color: var(--primary-color);
    background: var(--bg-card);
}

.tab-btn.active::after {
    content:  "";
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.tab-content {
    display: none;
    padding: 1.5rem;
}

.tab-content.active {
    display: block;
}

/* Architecture Diagram */
.architecture-diagram {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.file-structure {
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

.folder {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.folder i {
    margin-right: 0.5rem;
}

.file-list {
    margin-left: 2rem;
    margin-top: 1rem;
}

.file {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.file i {
    color: var(--secondary-color);
}

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

/* Concept Cards */
.concept-cards {
    display: grid;
    gap: 1.5rem;
}

.concept-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.concept-card h4 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom:  1rem;
    color: var(--text-primary);
}

.concept-card i {
    color: var(--primary-color);
}

/* UX Patterns */
.ux-patterns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.pattern-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.pattern-card:hover {
    transform:  translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.pattern-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.pattern-card h4 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

/* Test Table */
.test-results {
    overflow-x: auto;
}

.test-table {
    width: 100%;
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.test-table thead {
    background: var(--bg-hover);
}

.test-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.test-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.test-table tbody tr:hover {
    background: var(--bg-hover);
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight:  600;
}

.status-badge.success {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success-color);
}

/* Achievement Grid */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.achievement-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    border-top: 4px solid var(--success-color);
}

.achievement-card i {
    font-size: 2rem;
    color: var(--success-color);
    margin-bottom: 1rem;
}

.achievement-card h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.achievement-card ul {
    list-style: none;
}

.achievement-card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.achievement-card li::before {
    content:  "✓";
    position:  absolute;
    left: 0;
    color: var(--success-color);
}

/* Stats Container */
.stats-container {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

#codeStatsChart {
    max-height: 300px;
}

.stats-summary {
    display:  flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.stat-item {
    text-align: center;
}

.stat-item .stat-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.stat-item .stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Lessons Grid */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lesson-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.lesson-card.positive {
    border-top: 4px solid var(--success-color);
}

.lesson-card.challenges {
    border-top: 4px solid var(--warning-color);
}

.lesson-card h4 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.lesson-card.positive i {
    color: var(--success-color);
}

.lesson-card.challenges i {
    color: var(--warning-color);
}

/* Conclusion Section */
.conclusion-section {
    background: var(--bg-card);
    padding: 3rem 2rem;
    margin:  3rem 2rem;
    border-radius:  12px;
    border:  1px solid var(--border-color);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.conclusion-section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.conclusion-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

.conclusion-content p {
    margin-bottom:  1.5rem;
}

.signature-section {
    margin-top: 3rem;
    padding-top:  2rem;
    border-top:  1px solid var(--border-color);
}

.signature-box {
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
}

.signature-date {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.signature-line {
    padding-top: 1rem;
    border-top: 2px solid var(--border-color);
}

.signature-line p {
    font-size: 1.25rem;
    font-weight:  600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.signature-line span {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Footer */
.main-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
    margin-left: var(--sidebar-width);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.tech-badge {
    background:  var(--bg-hover);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
}

/* ============================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ============================================ */

/* Tablet and smaller (max-width: 1024px) */
@media (max-width: 1024px) {
    .sidebar {
        width: 220px;
    }
    
    .main-content {
        margin-left: 220px;
    }
    
    .main-footer {
        margin-left: 220px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .phases-timeline {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

/* Mobile devices (max-width: 768px) */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }
    
    /* Hide sidebar on mobile */
    .sidebar {
        display: none;
    }
    
    /* Full width content on mobile */
    .main-content {
        margin-left: 0;
    }
    
    .main-footer {
        margin-left: 0;
    }
    
    /* Header adjustments */
    .header-container {
        padding: 0 1rem;
    }
    
    .logo-section h1 {
        font-size: 1.1rem;
    }
    
    .logo-section i {
        font-size: 1.5rem;
    }
    
    .version-badge {
        display: none;
    }
    
    /* Hide main navigation on small mobile, show hamburger area */
    .main-nav ul {
        display: none;
    }
    
    /* Hero section mobile */
    .hero-section {
        padding: 2rem 1rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
        line-height: 1.3;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .project-info {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .info-card {
        padding: 1rem;
    }
    
    .info-card i {
        font-size: 1.5rem;
    }
    
    .info-card strong {
        font-size: 1rem;
    }
    
    /* Content sections mobile */
    .content-section {
        padding: 1.5rem 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
        gap: 0.75rem;
    }
    
    .section-number {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }
    
    .subsection h3 {
        font-size: 1.25rem;
    }
    
    /* Cards mobile */
    .content-card {
        padding: 1.25rem;
    }
    
    .analysis-grid {
        grid-template-columns: 1fr;
    }
    
    /* Timeline mobile */
    .timeline-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }
    
    .stat-value {
        font-size: 1.75rem;
    }
    
    .stat-label {
        font-size: 0.7rem;
    }
    
    .timeline-info {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    /* Phases timeline mobile */
    .phases-timeline {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .phase-card {
        padding: 1rem;
    }
    
    /* Day entries mobile */
    .day-header {
        flex-wrap: wrap;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }
    
    .day-badge,
    .date-badge,
    .hours-badge {
        font-size: 0.75rem;
        padding: 0.2rem 0.5rem;
    }
    
    .day-content {
        padding: 1rem;
    }
    
    /* Tab buttons mobile */
    .tab-buttons {
        flex-direction: column;
    }
    
    .tab-btn {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
    
    .tab-content {
        padding: 1rem;
    }
    
    /* Code preview mobile */
    .code-preview pre {
        padding: 0.75rem;
        font-size: 0.75rem;
    }
    
    /* Architecture diagram mobile */
    .architecture-diagram {
        padding: 1rem;
    }
    
    .file-structure {
        font-size: 0.8rem;
    }
    
    .file-list {
        margin-left: 1rem;
    }
    
    .file {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .file-desc {
        margin-left: 0;
        font-size: 0.75rem;
    }
    
    /* UX patterns mobile */
    .ux-patterns {
        grid-template-columns: 1fr;
    }
    
    .pattern-card {
        padding: 1.25rem;
    }
    
    .pattern-card i {
        font-size: 2rem;
    }
    
    /* Test table mobile */
    .test-table th,
    .test-table td {
        padding: 0.75rem 0.5rem;
        font-size: 0.8rem;
    }
    
    /* Achievement grid mobile */
    .achievement-grid {
        grid-template-columns: 1fr;
    }
    
    /* Stats container mobile */
    .stats-container {
        padding: 1.25rem;
    }
    
    .stats-summary {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    /* Lessons grid mobile */
    .lessons-grid {
        grid-template-columns: 1fr;
    }
    
    /* Conclusion section mobile */
    .conclusion-section {
        padding: 2rem 1rem;
        margin: 2rem 1rem;
    }
    
    .conclusion-section h2 {
        font-size: 1.5rem;
    }
    
    .signature-box {
        max-width: 100%;
    }
    
    /* Footer mobile */
    .footer-content {
        grid-template-columns: 1fr;
        padding: 2rem 1rem;
        gap: 1.5rem;
    }
    
    .footer-bottom {
        padding: 1rem;
        text-align: center;
    }
}

/* Small mobile devices (max-width: 480px) */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.25rem;
    }
    
    .hero-subtitle {
        font-size: 0.875rem;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
    
    .subsection h3 {
        font-size: 1.1rem;
    }
    
    .timeline-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 0.75rem;
    }
    
    .role-badge {
        font-size: 0.8rem;
        padding: 0.4rem 0.75rem;
    }
    
    .concept-card pre {
        font-size: 0.7rem;
    }
}