/* ==========================================
   CSS VARIABLES & ROOT STYLES
   ========================================== */
:root {
    /* Color Palette - Modern Dark Theme with Teal Accent */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1a2332;
    --color-bg-card: #151d2d;
    
    --color-text-primary: #e5e7eb;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;
    
    --color-accent-primary: #06b6d4;
    --color-accent-secondary: #0891b2;
    --color-accent-hover: #22d3ee;
    
    --color-border: #1f2937;
    --color-border-light: #2d3748;
    
    /* Typography */
    --font-primary: 'Sora', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.3);
}

body.light-theme {
    --color-bg-primary: #f7fafc;
    --color-bg-secondary: #eef2f7;
    --color-bg-tertiary: #dde4ee;
    --color-bg-card: #ffffff;

    --color-text-primary: #0f172a;
    --color-text-secondary: #334155;
    --color-text-muted: #64748b;

    --color-accent-primary: #0ea5e9;
    --color-accent-secondary: #0284c7;
    --color-accent-hover: #38bdf8;

    --color-border: #d5deea;
    --color-border-light: #c7d3e3;

    --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.12);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.14);
    --shadow-glow: 0 0 18px rgba(14, 165, 233, 0.3);
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   CONTAINER & LAYOUT
   ========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ==========================================
   NAVIGATION
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(10, 14, 26, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background-color: rgba(10, 14, 26, 0.95);
    box-shadow: var(--shadow-md);
}

body.light-theme .navbar {
    background-color: rgba(247, 250, 252, 0.9);
}

body.light-theme .navbar.scrolled {
    background-color: rgba(247, 250, 252, 0.96);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1400px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    transition: var(--transition-base);
}

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

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

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-base);
    position: relative;
    font-family: var(--font-mono);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-primary);
    transition: var(--transition-base);
}

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

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

.theme-toggle {
    border: 1px solid var(--color-accent-primary);
    background: transparent;
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-base);
}

.theme-toggle:hover {
    background-color: var(--color-accent-primary);
    color: var(--color-bg-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 0.4rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

/* Animated Background Effect */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

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

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

.hero-greeting {
    font-size: 1.1rem;
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.6s ease-out;
}

.hero-name {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-title {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.title-divider {
    color: var(--color-accent-primary);
    margin: 0 0.5rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 500px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 2px solid transparent;
    cursor: pointer;
}

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

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

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

.btn-secondary:hover {
    background-color: rgba(6, 182, 212, 0.1);
    transform: translateY(-2px);
}

/* Hero Profile */
.hero-visual {
    justify-self: end;
    align-self: start;
    animation: fadeInUp 0.6s ease-out 0.5s both;
}

.hero-profile {
    display: flex;
    justify-content: flex-end;
}

.hero-profile-photo-wrap {
    width: 360px;
    height: 360px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-accent-primary);
    box-shadow: var(--shadow-xl);
    background-color: var(--color-bg-card);
}

.hero-profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    animation: fadeIn 1s ease-out 1s both;
}

.scroll-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent-primary), transparent);
    animation: scrollAnimation 2s ease-in-out infinite;
}

@keyframes scrollAnimation {
    0%, 100% { transform: translateY(0); opacity: 0; }
    50% { transform: translateY(15px); opacity: 1; }
}

/* ==========================================
   SECTION STYLES
   ========================================== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.section-number {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--color-accent-primary);
    font-weight: 600;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    white-space: nowrap;
}

.section-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--color-border-light), transparent);
}

/* ==========================================
   ABOUT SECTION
   ========================================== */
.about {
    background-color: var(--color-bg-secondary);
}

.about-content {
    max-width: 900px;
}

.about-paragraph {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-paragraph strong {
    color: var(--color-accent-primary);
    font-weight: 600;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.highlight-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    transition: var(--transition-base);
}

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

.highlight-icon {
    font-size: 2rem;
    line-height: 1;
    color: var(--color-accent-primary);
}

.highlight-icon svg {
    width: 2rem;
    height: 2rem;
    display: block;
}

.highlight-content h4 {
    font-size: 1.1rem;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.highlight-content p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* ==========================================
   EDUCATION SECTION
   ========================================== */
.education-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.education-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
}

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

.education-degree {
    color: var(--color-text-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.education-line {
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.education-line strong {
    color: var(--color-accent-primary);
}

.education-note {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ==========================================
   SKILLS SECTION
   ========================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.skill-card {
    background-color: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-base);
}

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

.skill-card:hover::before {
    transform: scaleX(1);
}

.skill-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(8, 145, 178, 0.1));
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: var(--color-accent-primary);
    transition: var(--transition-base);
}

.skill-card:hover .skill-icon {
    transform: scale(1.1) rotate(5deg);
}

.skill-icon svg {
    width: 28px;
    height: 28px;
}

.skill-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.skill-description {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ==========================================
   RESEARCH SECTION
   ========================================== */
.research {
    background-color: var(--color-bg-secondary);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.research-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
    box-shadow: var(--shadow-md);
}

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

.research-title {
    font-size: 1.35rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.research-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-sm);
}

.research-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.research-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent-primary);
    border: 1px solid var(--color-border-light);
    background-color: rgba(6, 182, 212, 0.1);
    border-radius: 999px;
    padding: 0.3rem 0.7rem;
}

/* ==========================================
   PROJECTS SECTION
   ========================================== */
.projects {
    background-color: var(--color-bg-secondary);
}

.projects-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

.project-card {
    background-color: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xl);
    position: relative;
    transition: all var(--transition-base);
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-accent-primary), var(--color-accent-secondary));
    transform: scaleY(0);
    transform-origin: bottom;
    transition: var(--transition-slow);
}

.project-card:hover {
    transform: translateX(8px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-xl);
}

.project-card:hover::before {
    transform: scaleY(1);
}

.project-number {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: rgba(6, 182, 212, 0.1);
    line-height: 1;
}

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

.project-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.project-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.4rem 0.9rem;
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--color-accent-primary);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(6, 182, 212, 0.2);
    transition: var(--transition-fast);
}

.tech-tag:hover {
    background-color: rgba(6, 182, 212, 0.2);
    transform: translateY(-2px);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background-color: transparent;
    color: var(--color-accent-primary);
    border: 1px solid var(--color-accent-primary);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-base);
}

.project-link:hover {
    background-color: var(--color-accent-primary);
    color: var(--color-bg-primary);
    transform: translateY(-2px);
}

.project-link svg {
    width: 18px;
    height: 18px;
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.contact-heading {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.contact-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all var(--transition-base);
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(8, 145, 178, 0.15));
    border-radius: var(--radius-md);
    color: var(--color-accent-primary);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.contact-info p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    word-break: break-word;
}

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

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-text {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background-color: var(--color-bg-card);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.footer-links a:hover {
    background-color: var(--color-accent-primary);
    color: var(--color-bg-primary);
    border-color: var(--color-accent-primary);
    transform: translateY(-4px);
}

.footer-links svg {
    width: 20px;
    height: 20px;
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

/* Tablet */
@media (max-width: 1024px) {
    .hero {
        padding-top: 110px;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .hero-name {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

/* Small Laptop */
@media (min-width: 769px) and (max-width: 1366px) {
    .hero {
        padding-top: 140px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg-secondary);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .theme-toggle {
        width: 100%;
        justify-content: center;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-3xl) 0;
    }
    
    .hero-name {
        font-size: 2.5rem;
    }
    
    .hero-title {
        font-size: 1.2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-header {
        flex-wrap: wrap;
    }
    
    .section-line {
        display: none;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        justify-self: center;
    }

    .hero-profile-photo-wrap {
        width: 280px;
        height: 280px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card {
        padding: var(--spacing-lg);
    }
    
    .project-number {
        font-size: 2rem;
        top: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .project-title {
        font-size: 1.5rem;
    }
    
    .project-links {
        flex-direction: column;
    }
    
    .project-link {
        justify-content: center;
    }
    
    .contact-links {
        grid-template-columns: 1fr;
    }
    
    .scroll-indicator {
        display: none;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .hero-name {
        font-size: 2rem;
    }
    
    .hero-profile-photo-wrap {
        width: 230px;
        height: 230px;
    }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}