/* ============================================
   PRINCE ADDAE PORTFOLIO - STYLE.CSS
   ============================================ */

/* CSS Variables */
:root {
    /* Color Palette */
    --primary: #0A192F;
    --primary-light: #112240;
    --primary-dark: #020c1b;
    --accent-blue: #3B82F6;
    --accent-emerald: #10B981;
    --accent-purple: #8B5CF6;
    --accent-cyan: #06B6D4;
    
    /* Background Colors */
    --bg-primary: #0A192F;
    --bg-secondary: #112240;
    --bg-card: rgba(17, 34, 64, 0.7);
    --bg-glass: rgba(17, 34, 64, 0.5);
    
    /* Text Colors */
    --text-primary: #E6F1FF;
    --text-secondary: #8892B0;
    --text-muted: #5C6A7A;
    
    /* Border Colors */
    --border-color: rgba(59, 130, 246, 0.2);
    --border-hover: rgba(59, 130, 246, 0.5);
    
    /* 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(59, 130, 246, 0.3);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0A192F 0%, #112240 100%);
    --gradient-accent: linear-gradient(135deg, #3B82F6 0%, #10B981 100%);
    --gradient-hero: linear-gradient(180deg, #0A192F 0%, #020c1b 100%);
    
    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #F8FAFC;
    --bg-secondary: #E2E8F0;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --border-color: rgba(59, 130, 246, 0.15);
    --border-hover: rgba(59, 130, 246, 0.4);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

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

ul {
    list-style: none;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Section Styling */
section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
    padding: 6px 16px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 20px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-line {
    width: 60px;
    height: 4px;
    background: var(--gradient-accent);
    margin: 0 auto;
    border-radius: 2px;
}

/* Glass Card Effect */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    transition: all var(--transition-medium);
}

.glass-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-medium);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.btn-primary:hover {
    background: #2563EB;
    border-color: #2563EB;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--accent-emerald);
    color: white;
    border-color: var(--accent-emerald);
}

.btn-secondary:hover {
    background: #059669;
    border-color: #059669;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--accent-blue);
}

.btn-outline:hover {
    background: var(--accent-blue);
    color: white;
    transform: translateY(-2px);
}

/* ============================================
   SCROLL PROGRESS INDICATOR
   ============================================ */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--gradient-accent);
    z-index: 1001;
    transition: width 0.1s ease;
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background: var(--accent-blue);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-medium);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: #2563EB;
    transform: translateY(-4px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 999;
    padding: 15px 0;
    transition: all var(--transition-medium);
    border-bottom: 1px solid transparent;
}

[data-theme="light"] .navbar {
    background: rgba(248, 250, 252, 0.85);
}

.navbar.scrolled {
    background: rgba(10, 25, 47, 0.95);
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(248, 250, 252, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-text .accent {
    color: var(--accent-blue);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    gap: 8px;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Mobile Menu Toggle Animation */
.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 20px 100px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 8s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-blue);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: var(--accent-emerald);
    bottom: -50px;
    left: -50px;
    animation-delay: 2s;
}

.orb-3 {
    width: 200px;
    height: 200px;
    background: var(--accent-purple);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    25% {
        transform: translate(20px, -20px);
    }
    50% {
        transform: translate(-20px, 20px);
    }
    75% {
        transform: translate(-20px, -20px);
    }
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.availability-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 30px;
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--accent-emerald);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-emerald);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.hero-title {
    margin-bottom: 20px;
}

.greeting {
    display: block;
    font-size: 20px;
    font-weight: 400;
    color: var(--accent-blue);
    margin-bottom: 8px;
}

.name {
    display: block;
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.typing-container {
    font-size: clamp(18px, 3vw, 24px);
    color: var(--text-secondary);
    margin-bottom: 24px;
    min-height: 36px;
}

.typing-text {
    color: var(--accent-emerald);
    font-weight: 500;
}

.cursor {
    animation: blink 1s step-end infinite;
    color: var(--accent-blue);
}

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

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-social {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    font-size: 18px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--accent-blue);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    50% {
        opacity: 0.3;
        transform: translateX(-50%) translateY(12px);
    }
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
    display: grid;
    gap: 40px;
}

.about-card {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    align-items: start;
}

.about-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    z-index: 1;
    border: 3px solid var(--accent-blue);
}

.image-placeholder {
    width: 200px;
    height: 200px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

.image-ring {
    position: absolute;
    width: 220px;
    height: 220px;
    border: 3px solid var(--accent-blue);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.about-text h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--accent-blue);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-blue);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

/* Timeline */
.timeline {
    margin-top: 40px;
}

.timeline-title {
    font-size: 20px;
    margin-bottom: 30px;
    text-align: center;
}

.timeline-container {
    position: relative;
    padding-left: 30px;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 30px;
}

.timeline-dot {
    position: absolute;
    left: -34px;
    top: 20px;
    width: 10px;
    height: 10px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

.timeline-content {
    padding: 20px;
}

.timeline-content .year {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-blue);
    display: block;
    margin-bottom: 8px;
}

.timeline-content h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

.timeline-content.future {
    border-color: rgba(16, 185, 129, 0.3);
}

.timeline-content.future .year {
    color: var(--accent-emerald);
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 50px;
}

.skill-category {
    padding: 24px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.category-icon {
    width: 50px;
    height: 50px;
    background: rgba(59, 130, 246, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--accent-blue);
}

.category-icon.ai {
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent-purple);
}

.category-icon.future {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-cyan);
}

.category-icon.tools {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
}

.category-icon.teaching {
    background: rgba(245, 158, 11, 0.15);
    color: #F59E0B;
}

.category-icon.cert {
    background: rgba(239, 68, 68, 0.15);
    color: #EF4444;
}

.category-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
}

/* Progress Bars */
.progress-item {
    margin-bottom: 20px;
}

.progress-item:last-child {
    margin-bottom: 0;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 14px;
}

.progress-header span:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

.progress-header span:last-child {
    color: var(--accent-cyan);
    font-size: 12px;
}

.progress-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
    border-radius: 4px;
    width: 0;
    transition: width 1s ease;
}

/* Teaching Cards */
.teaching-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.teaching-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
}

.teaching-card i {
    font-size: 28px;
    color: var(--accent-blue);
}

.teaching-card span {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Certifications Placeholder */
.cert-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--text-muted);
}

.cert-placeholder i {
    font-size: 32px;
    margin-bottom: 10px;
}

.cert-placeholder span {
    font-size: 14px;
}

/* Skills Roadmap */
.skills-roadmap {
    text-align: center;
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.roadmap-title {
    font-size: 20px;
    margin-bottom: 30px;
    color: var(--accent-cyan);
}

.roadmap-timeline {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.roadmap-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.step-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-secondary);
    border: 2px solid var(--accent-cyan);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--accent-cyan);
    transition: all var(--transition-medium);
}

.roadmap-step:hover .step-icon {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    transform: scale(1.1);
}

.roadmap-step span {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.roadmap-arrow {
    color: var(--accent-cyan);
    font-size: 14px;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.project-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 10px 24px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    padding: 0;
    overflow: hidden;
    transition: all var(--transition-medium);
}

.project-card:hover {
    transform: translateY(-8px);
}

.project-image {
    position: relative;
    height: 200px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder {
    font-size: 50px;
    color: var(--text-muted);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 25, 47, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.overlay-btn {
    padding: 10px 20px;
    background: var(--accent-blue);
    border-radius: var(--radius-md);
    color: white;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transform: translateY(20px);
    opacity: 0;
    transition: all var(--transition-medium);
}

.project-card:hover .overlay-btn {
    transform: translateY(0);
    opacity: 1;
}

.overlay-btn:nth-child(2) {
    transition-delay: 0.1s;
}

.overlay-btn:hover {
    background: #2563EB;
}

.project-info {
    padding: 24px;
}

.project-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.project-info p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tech span {
    padding: 4px 12px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    font-size: 12px;
    color: var(--accent-blue);
}

/* Project Filter Animation */
.project-card.hidden {
    display: none;
}

/* ============================================
   RESEARCH SECTION
   ============================================ */
.research-content {
    display: grid;
    gap: 40px;
}

.research-intro {
    text-align: center;
    padding: 40px;
}

.research-intro h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--accent-blue);
}

.research-intro p {
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto;
}

.research-areas h3,
.publications h3 {
    font-size: 22px;
    margin-bottom: 24px;
    text-align: center;
}

.areas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.area-card {
    text-align: center;
    padding: 30px;
}

.area-card i {
    font-size: 36px;
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.area-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
}

.area-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Publications */
.publication-list {
    display: grid;
    gap: 20px;
}

.publication-item {
    display: flex;
    gap: 20px;
    align-items: start;
}

.pub-icon {
    width: 50px;
    height: 50px;
    background: rgba(59, 130, 246, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--accent-blue);
    flex-shrink: 0;
}

.pub-info h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

.pub-info p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.pub-meta {
    display: flex;
    gap: 20px;
}

.pub-meta span {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ============================================
   TEACHING SECTION
   ============================================ */
.teaching-content {
    display: grid;
    gap: 40px;
}

.teaching-main {
    text-align: center;
    padding: 50px;
}

.teaching-icon {
    width: 80px;
    height: 80px;
    background: rgba(245, 158, 11, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: #F59E0B;
    margin: 0 auto 24px;
}

.teaching-main h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.teaching-main p {
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto 24px;
}

.teaching-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
}

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

.t-stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: #F59E0B;
    font-family: var(--font-heading);
}

.t-stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

.mentorship h3 {
    font-size: 22px;
    margin-bottom: 24px;
    text-align: center;
}

.mentorship-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.mentorship-card {
    text-align: center;
    padding: 30px;
}

.mentorship-card i {
    font-size: 32px;
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.mentorship-card h4 {
    font-size: 16px;
    margin-bottom: 10px;
}

.mentorship-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================
   RESUME SECTION
   ============================================ */
.resume-content {
    display: grid;
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.resume-summary {
    padding: 40px;
}

.resume-summary h3 {
    font-size: 22px;
    margin-bottom: 16px;
    color: var(--accent-blue);
}

.resume-summary > p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.summary-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.highlight-item i {
    color: var(--accent-emerald);
    font-size: 14px;
}

.highlight-item span {
    font-size: 14px;
    color: var(--text-secondary);
}

.resume-education h3 {
    font-size: 22px;
    margin-bottom: 24px;
}

.education-card {
    display: flex;
    gap: 24px;
    align-items: start;
}

.edu-icon {
    width: 60px;
    height: 60px;
    background: rgba(59, 130, 246, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--accent-blue);
    flex-shrink: 0;
}

.edu-info h4 {
    font-size: 18px;
    margin-bottom: 6px;
}

.edu-degree {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.edu-duration {
    font-size: 14px;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.edu-focus {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.focus-tag {
    padding: 4px 12px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    font-size: 12px;
    color: var(--accent-blue);
}

.resume-download {
    text-align: center;
    padding: 20px;
}

/* ============================================
   TESTIMONIALS SECTION
   ============================================ */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    padding: 30px;
}

.testimonial-header {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 20px;
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-muted);
}

.testimonial-author h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.testimonial-author span {
    font-size: 13px;
    color: var(--text-muted);
}

.testimonial-content {
    margin-bottom: 16px;
}

.testimonial-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-style: italic;
}

.testimonial-rating {
    display: flex;
    gap: 4px;
    color: #F59E0B;
    font-size: 14px;
}

/* ============================================
   BLOG SECTION
   ============================================ */
.blog-content {
    display: grid;
    gap: 40px;
}

.blog-intro {
    text-align: center;
    padding: 50px;
}

.blog-intro i {
    font-size: 48px;
    color: var(--accent-blue);
    margin-bottom: 20px;
}

.blog-intro h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.blog-intro p {
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.blog-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.blog-category {
    text-align: center;
    padding: 30px;
}

.blog-category i {
    font-size: 36px;
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.blog-category h4 {
    font-size: 18px;
    margin-bottom: 10px;
}

.blog-category p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 40px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-card {
    display: flex;
    gap: 20px;
    align-items: center;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: rgba(59, 130, 246, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--accent-blue);
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 16px;
    margin-bottom: 6px;
}

.contact-details a {
    font-size: 14px;
    color: var(--text-secondary);
}

.contact-details a:hover {
    color: var(--accent-blue);
}

.contact-form-container {
    padding: 40px;
}

.contact-form-container h3 {
    font-size: 22px;
    margin-bottom: 24px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    display: block;
    font-size: 12px;
    color: #EF4444;
    margin-top: 6px;
    min-height: 18px;
}

.contact-form .btn {
    width: 100%;
    justify-content: center;
    padding: 16px;
    font-size: 16px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    padding: 50px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    text-align: center;
}

.footer-logo {
    margin-bottom: 24px;
}

.footer-logo .logo-text {
    font-size: 28px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
}

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

.footer-social {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 30px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.footer-bottom p:last-child {
    margin-bottom: 0;
}

.footer-bottom i {
    color: #EF4444;
}

/* ============================================
   ANIMATIONS & REVEAL
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .about-card {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-image {
        order: -1;
    }
    
    .about-stats {
        justify-content: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    section {
        padding: 80px 0;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    /* Mobile Navigation */
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-secondary);
        padding: 80px 20px 30px;
        transition: right var(--transition-medium);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
    }
    
    .nav-link {
        display: block;
        padding: 12px 16px;
    }
    
    /* Hero */
    .hero {
        padding: 120px 20px 80px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    /* Skills */
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-filters {
        gap: 8px;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    
    /* Teaching Stats */
    .teaching-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    /* Timeline */
    .timeline-container {
        padding-left: 20px;
    }
    
    /* Contact */
    .contact-form-container {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .name {
        font-size: 36px;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .teaching-cards {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .publication-item {
        flex-direction: column;
        text-align: center;
    }
    
    .pub-meta {
        justify-content: center;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

.text-primary {
    color: var(--accent-blue);
}

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

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mt-4 { margin-top: 40px; }

.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.mb-4 { margin-bottom: 40px; }

/* Print Styles */
@media print {
    .navbar,
    .back-to-top,
    .scroll-progress,
    .scroll-indicator,
    .hero-cta,
    .hero-social {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .glass-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}