/* ============================================
   MODERN PORTFOLIO - MAIN STYLES
   Clean, professional, sophisticated
   ============================================ */

/* ============================================
   CSS VARIABLES & DESIGN TOKENS
   ============================================ */
:root {
    /* Colors - Sophisticated neutral palette with subtle accents */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #0f0f12;
    --color-bg-tertiary: #16161a;

    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #6b6b6b;

    --color-accent: #4a9eff;
    --color-accent-dim: #2d5f9a;
    --color-accent-glow: rgba(74, 158, 255, 0.15);

    --color-border: #222222;
    --color-border-hover: #333333;

    /* Typography - System fonts for clarity and performance */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

    /* Font Sizes - Fluid, responsive scale */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
    --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
    --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.75rem);
    --text-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2.5rem);
    --text-3xl: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);

    /* Spacing - Consistent rhythm */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Layout */
    --container-max: 1100px;
    --content-max: 720px;
    --nav-height: 64px;

    /* Animation */
    --ease-smooth: cubic-bezier(0.4, 0.0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --duration-fast: 150ms;
    --duration-base: 250ms;
    --duration-slow: 400ms;
}

/* Light Theme Overrides */
[data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f8f8;
    --color-bg-tertiary: #f0f0f0;

    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-text-tertiary: #6b6b6b;

    --color-accent: #2563eb;
    --color-accent-dim: #1d4ed8;
    --color-accent-glow: rgba(37, 99, 235, 0.1);

    --color-border: #e0e0e0;
    --color-border-hover: #d0d0d0;
}

[data-theme="light"] .nav {
    background-color: rgba(255, 255, 255, 0.85);
    border-bottom-color: var(--color-border);
}

[data-theme="light"] .nav.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] body::before {
    background-image:
        url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h60v60H0z' fill='none'/%3E%3Cpath d='M0 0h60v60H0z' fill='none' stroke='rgba(37,99,235,0.03)' stroke-width='1'/%3E%3C/svg%3E"),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.02'/%3E%3C/svg%3E");
}

[data-theme="light"] .hero {
    background:
        radial-gradient(ellipse 100% 60% at 50% 0%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
        var(--color-bg-primary);
}

/* Light Theme - Section Backgrounds */
[data-theme="light"] .section-alt {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, rgba(248, 248, 248, 0.8) 100%);
}

[data-theme="light"] .section-alt::before {
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.3;
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
}

/* Light Theme - Timeline/Experience Cards */
[data-theme="light"] .timeline-content {
    background: transparent;
}

[data-theme="light"] .timeline-marker {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 0 12px rgba(37, 99, 235, 0.4);
}

[data-theme="light"] .timeline-item:not(:first-child) .timeline-marker {
    box-shadow: 0 0 8px rgba(37, 99, 235, 0.3);
}

/* Light Theme - Project Cards */
[data-theme="light"] .project-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 248, 248, 0.9) 100%);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .project-card::before {
    background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.05), transparent 50%);
}

[data-theme="light"] .project-card::after {
    background: linear-gradient(90deg, transparent, var(--color-accent), rgba(99, 102, 241, 0.5), transparent);
}

[data-theme="light"] .project-card:hover {
    border-color: rgba(37, 99, 235, 0.3);
    box-shadow: 0 12px 32px rgba(37, 99, 235, 0.15), 0 0 40px rgba(37, 99, 235, 0.1);
}

[data-theme="light"] .project-card:nth-child(2)::before {
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.05), transparent 50%);
}

[data-theme="light"] .project-card:nth-child(2)::after {
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.8), var(--color-accent), transparent);
}

[data-theme="light"] .project-card:nth-child(2):hover {
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.15), 0 0 40px rgba(99, 102, 241, 0.1);
}

[data-theme="light"] .project-subtitle {
    color: var(--color-accent);
    text-shadow: none;
}

[data-theme="light"] .project-card:nth-child(2) .project-subtitle {
    color: #6366f1;
    text-shadow: none;
}

/* Light Theme - Article Cards */
[data-theme="light"] .article-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 248, 248, 0.9) 100%);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .article-card::before {
    background: linear-gradient(180deg, var(--color-accent), rgba(99, 102, 241, 0.6), transparent);
}

[data-theme="light"] .article-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12), 0 0 40px rgba(37, 99, 235, 0.08);
}

/* Light Theme - GitHub Activity Section */
[data-theme="light"] .github-activity-compact {
    border-top-color: var(--color-border);
}

[data-theme="light"] .github-stats-compact {
    background: rgba(248, 248, 248, 0.5);
    border: 1px solid var(--color-border);
}

[data-theme="light"] .stat-compact {
    border-right-color: var(--color-border);
}

[data-theme="light"] .stat-compact-value {
    color: var(--color-accent);
}

/* Light Theme - Tech Tags */
[data-theme="light"] .tech-tag,
[data-theme="light"] .skill-tag {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

[data-theme="light"] .article-tag {
    background: var(--color-bg-secondary);
    color: var(--color-accent);
    border: 1px solid var(--color-border);
}

/* Light Theme - GitHub Contribution Graph */
[data-theme="light"] .github-contribution-graph {
    background: linear-gradient(135deg, rgba(248, 248, 248, 0.5) 0%, rgba(255, 255, 255, 0.3) 100%);
    border: 1px solid var(--color-border);
}

[data-theme="light"] .github-contribution-graph:hover {
    border-color: var(--color-border-hover);
    background: linear-gradient(135deg, rgba(248, 248, 248, 0.7) 0%, rgba(255, 255, 255, 0.5) 100%);
}

[data-theme="light"] .github-contribution-graph img {
    opacity: 0.85;
}

/* Light Theme - Education Section */
[data-theme="light"] .education-item {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 248, 248, 0.8) 100%);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .education-item:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .education-institution {
    color: #6366f1;
    text-shadow: none;
}

/* Light Theme - Contact Links */
[data-theme="light"] .contact-link {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 248, 248, 0.8) 100%);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .contact-link:hover {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(248, 248, 248, 0.9) 100%);
    border-color: var(--color-accent);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.12);
}

[data-theme="light"] .contact-link::before {
    background: var(--color-accent);
}

/* Light Theme - Hero Links */
[data-theme="light"] .hero-link {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .hero-link::before {
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
}

[data-theme="light"] .hero-link:hover {
    background-color: var(--color-bg-primary);
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

/* Light Theme - Footer */
[data-theme="light"] .footer {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    border-top: 1px solid var(--color-border);
}

[data-theme="light"] .footer::before {
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.2;
}

/* Light Theme - Scroll Helpers */
[data-theme="light"] .scroll-to-top {
    background: var(--color-bg-primary);
    border-color: var(--color-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .scroll-to-top:hover {
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.2);
}

[data-theme="light"] .section-dot {
    border-color: var(--color-border);
}

[data-theme="light"] .scroll-progress {
    box-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
}

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.65;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
    position: relative;
    min-width: 320px;
}

html {
    overflow-x: hidden;
}

/* Subtle noise texture and grid for depth */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h60v60H0z' fill='none'/%3E%3Cpath d='M0 0h60v60H0z' fill='none' stroke='rgba(74,158,255,0.03)' stroke-width='1'/%3E%3C/svg%3E"),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
    opacity: 0.5;
}

body > * {
    position: relative;
    z-index: 2;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

p {
    color: var(--color-text-secondary);
    max-width: 65ch;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration-base) var(--ease-smooth);
}

ul, ol {
    list-style: none;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-xl);
    }
}

.section {
    padding: var(--space-3xl) 0;
    position: relative;
    overflow: hidden;
}

.section-alt {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, rgba(15, 15, 18, 0.8) 100%);
    position: relative;
}

.section-alt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.5;
    box-shadow: 0 0 20px rgba(74, 158, 255, 0.5);
}

/* Add backlight glow effects to different sections */
#about {
    background:
        linear-gradient(180deg, transparent 0%, var(--color-bg-primary) 15%, var(--color-bg-primary) 85%, transparent 100%),
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(74, 158, 255, 0.12), transparent 70%),
        var(--color-bg-primary);
    position: relative;
    overflow: hidden;
    --parallax-y: 0px;
}

#about::before {
    content: '';
    position: absolute;
    top: calc(-200px + var(--parallax-y, 0px));
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(74, 158, 255, 0.15), transparent 60%);
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
    animation: drift 20s ease-in-out infinite;
    transition: top 0.1s ease-out;
}

#about > .container {
    position: relative;
    z-index: 1;
}

#experience {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 10%, var(--color-bg-secondary) 90%, transparent 100%);
}

#experience::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(138, 99, 210, 0.12), transparent 60%);
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    animation: floatReverse 28s ease-in-out infinite;
}

#experience > .container {
    position: relative;
    z-index: 1;
}

#projects {
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-primary) 10%, var(--color-bg-primary) 90%, transparent 100%);
    position: relative;
    overflow: hidden;
    --parallax-y: 0px;
}

#projects::before {
    content: '';
    position: absolute;
    top: calc(20% + var(--parallax-y, 0px));
    right: 10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(74, 158, 255, 0.15), transparent 60%);
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    animation: drift 32s ease-in-out infinite;
    transition: top 0.1s ease-out;
}

#projects::after {
    content: '';
    position: absolute;
    bottom: calc(10% - var(--parallax-y, 0px));
    left: 10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(138, 99, 210, 0.12), transparent 60%);
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    animation: floatReverse 26s ease-in-out infinite;
    transition: bottom 0.1s ease-out;
}

#projects > .container {
    position: relative;
    z-index: 1;
}

#writing {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 10%, var(--color-bg-secondary) 90%, transparent 100%);
}

#writing::before {
    content: '';
    position: absolute;
    top: 30%;
    left: 15%;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, rgba(74, 158, 255, 0.1), transparent 60%);
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
    animation: drift 24s ease-in-out infinite;
}

#writing > .container {
    position: relative;
    z-index: 1;
}

#contact {
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-primary) 10%, var(--color-bg-primary) 100%);
    position: relative;
    overflow: hidden;
}

#contact::before {
    content: '';
    position: absolute;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 500px;
    background: radial-gradient(ellipse, rgba(74, 158, 255, 0.15), transparent 60%);
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
    animation: floatReverse 22s ease-in-out infinite;
}

#contact > .container {
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--space-xl);
    color: var(--color-text-primary);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dim), transparent);
    border-radius: 2px;
    box-shadow: 0 0 15px rgba(74, 158, 255, 0.7), 0 0 30px rgba(74, 158, 255, 0.4);
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--duration-base) var(--ease-smooth);
}

.nav.scrolled {
    background-color: rgba(10, 10, 10, 0.95);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    border-bottom-color: var(--color-border-hover);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    transition: transform var(--duration-base) var(--ease-smooth);
}

.nav-brand:hover {
    transform: scale(1.05);
}

.nav-brand-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-border);
    transition: all var(--duration-base) var(--ease-smooth);
    box-shadow: 0 0 0 0 rgba(74, 158, 255, 0);
}

.nav-brand:hover .nav-brand-img {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(74, 158, 255, 0.2);
}

.nav-menu {
    display: none;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    position: relative;
    transition: color var(--duration-base) var(--ease-smooth);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width var(--duration-base) var(--ease-smooth);
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

@media (max-width: 768px) {
    .nav-controls {
        display: flex;
        position: absolute;
        right: calc(var(--space-md) + 52px);
        gap: 0.375rem;
    }

    .theme-toggle,
    .language-toggle {
        width: 36px;
        height: 36px;
        padding: 0.4rem;
        min-width: 36px;
    }

    .language-toggle {
        font-size: 11px;
        min-width: 40px;
    }
}

@media (max-width: 380px) {
    .nav-controls {
        right: calc(var(--space-sm) + 48px);
        gap: 0.25rem;
    }

    .theme-toggle,
    .language-toggle {
        width: 32px;
        height: 32px;
        padding: 0.35rem;
        min-width: 32px;
    }

    .language-toggle {
        font-size: 10px;
        min-width: 36px;
    }

    .nav-container {
        padding: 0 var(--space-sm);
    }
}

.theme-toggle,
.language-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    padding: 0.5rem;
    transition: all var(--duration-base) var(--ease-smooth);
    color: var(--color-text-secondary);
}

.theme-toggle:hover,
.language-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: var(--color-accent-glow);
}

.theme-toggle {
    width: 36px;
    height: 36px;
    position: relative;
}

.theme-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity var(--duration-base) var(--ease-smooth), transform var(--duration-base) var(--ease-smooth);
}

.theme-icon-dark {
    opacity: 1;
}

.theme-icon-light {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(180deg);
}

[data-theme="light"] .theme-icon-dark {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(-180deg);
}

[data-theme="light"] .theme-icon-light {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

.language-toggle {
    min-width: 48px;
    height: 36px;
    font-size: var(--text-xs);
    font-weight: 600;
    font-family: var(--font-mono);
}

.language-label {
    user-select: none;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--duration-base) var(--ease-smooth);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--nav-height);
    background:
        radial-gradient(ellipse 100% 60% at 50% 0%, rgba(74, 158, 255, 0.15) 0%, transparent 70%),
        var(--color-bg-primary);
    overflow: hidden;
    --parallax-y: 0px;
}

/* Backlight glow orbs with fluid animation and parallax */
.hero::before {
    content: '';
    position: absolute;
    top: calc(15% + var(--parallax-y, 0px));
    right: 10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(74, 158, 255, 0.2) 0%, transparent 60%);
    border-radius: 50%;
    animation: drift 25s ease-in-out infinite;
    pointer-events: none;
    filter: blur(80px);
    transition: top 0.1s ease-out;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: calc(15% - var(--parallax-y, 0px));
    left: 10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(138, 99, 210, 0.15) 0%, transparent 60%);
    border-radius: 50%;
    animation: floatReverse 30s ease-in-out infinite;
    pointer-events: none;
    filter: blur(80px);
    transition: bottom 0.1s ease-out;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(-30px, 30px) scale(1.1);
    }
    66% {
        transform: translate(20px, -20px) scale(0.95);
    }
}

@keyframes floatReverse {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(40px, -30px) scale(1.05);
    }
    66% {
        transform: translate(-25px, 25px) scale(0.9);
    }
}

@keyframes drift {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(20px, 15px) scale(1.08);
    }
    50% {
        transform: translate(-15px, 30px) scale(0.92);
    }
    75% {
        transform: translate(25px, -20px) scale(1.05);
    }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 12px rgba(74, 158, 255, 0.6), 0 0 4px rgba(74, 158, 255, 0.4);
    }
    50% {
        box-shadow: 0 0 16px rgba(74, 158, 255, 0.8), 0 0 6px rgba(74, 158, 255, 0.6);
    }
}

.hero-content {
    padding: var(--space-3xl) 0;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--text-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.hero-description {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.hero-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.hero-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(74, 158, 255, 0.1), transparent);
    transition: left var(--duration-slow) var(--ease-smooth);
}

.hero-link:hover::before {
    left: 100%;
}

.hero-link:hover {
    background-color: var(--color-bg-secondary);
    border-color: var(--color-accent-dim);
    color: var(--color-text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.15);
}

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

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
    max-width: var(--content-max);
}

.about-content p {
    margin-bottom: var(--space-md);
}

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

.skills {
    margin-top: var(--space-2xl);
}

.skills-title {
    font-size: var(--text-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skill-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: all var(--duration-base) var(--ease-smooth);
    cursor: default;
    position: relative;
}

.skill-tag::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 6px;
    padding: 1px;
    background: linear-gradient(135deg, var(--color-accent), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-smooth);
}

.skill-tag:hover {
    border-color: var(--color-accent-dim);
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

.skill-tag:hover::before {
    opacity: 0.6;
}

/* ============================================
   EXPERIENCE SECTION - TIMELINE
   ============================================ */
.timeline {
    position: relative;
    max-width: var(--content-max);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-dim) 50%, var(--color-border) 100%);
    box-shadow: 0 0 15px rgba(74, 158, 255, 0.6), 0 0 30px rgba(74, 158, 255, 0.3);
}

@media (min-width: 768px) {
    .timeline::before {
        left: 8px;
    }
}

.timeline-item {
    position: relative;
    padding-left: var(--space-lg);
    padding-bottom: var(--space-2xl);
}

@media (min-width: 768px) {
    .timeline-item {
        padding-left: var(--space-3xl);
    }
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -4px;
    top: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-accent);
    border: 2px solid var(--color-bg-secondary);
    z-index: 1;
    box-shadow: 0 0 12px rgba(74, 158, 255, 0.6), 0 0 4px rgba(74, 158, 255, 0.4);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 12px rgba(74, 158, 255, 0.6), 0 0 4px rgba(74, 158, 255, 0.4);
    }
    50% {
        box-shadow: 0 0 16px rgba(74, 158, 255, 0.8), 0 0 6px rgba(74, 158, 255, 0.6);
    }
}

.timeline-item:not(:first-child) .timeline-marker {
    animation: none;
    box-shadow: 0 0 8px rgba(74, 158, 255, 0.4);
}

@media (min-width: 768px) {
    .timeline-marker {
        left: 4px;
    }
}

.timeline-content {
    background: linear-gradient(135deg, rgba(22, 22, 26, 0.95) 0%, rgba(15, 15, 18, 0.8) 100%);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--space-lg);
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), rgba(138, 99, 210, 0.6), transparent);
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-smooth);
}

.timeline-content:hover {
    border-color: var(--color-border-hover);
    transform: translateX(4px);
    box-shadow: 0 8px 24px rgba(74, 158, 255, 0.2), 0 0 40px rgba(74, 158, 255, 0.1);
}

.timeline-content:hover::before {
    opacity: 1;
}

.timeline-header {
    margin-bottom: var(--space-md);
}

.timeline-title {
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.timeline-company {
    display: block;
    font-size: var(--text-base);
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
    font-weight: 500;
    text-shadow: 0 0 20px rgba(74, 158, 255, 0.3);
}

.timeline-date {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
}

.timeline-description {
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
}

.timeline-section {
    margin-top: var(--space-lg);
}

.timeline-section:first-of-type {
    margin-top: var(--space-md);
}

.timeline-section h4 {
    font-size: var(--text-base);
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
    font-weight: 600;
}

.timeline-section ul {
    list-style: none;
    padding-left: 0;
}

.timeline-section li {
    position: relative;
    padding-left: var(--space-md);
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
}

.timeline-section li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.tech-tag {
    display: inline-block;
    padding: 4px var(--space-sm);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: var(--text-xs);
    font-family: var(--font-mono);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

/* Education */
.education {
    margin-top: var(--space-3xl);
    max-width: var(--content-max);
}

.education-title {
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
    font-weight: 600;
}

.education-item {
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(26, 26, 26, 0.5) 100%);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: all var(--duration-base) var(--ease-smooth);
}

.education-item:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.education-item h4 {
    font-size: var(--text-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.education-institution {
    color: #8a63d2;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    text-shadow: 0 0 20px rgba(138, 99, 210, 0.3);
}

.education-date {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-grid {
    display: grid;
    gap: var(--space-xl);
    max-width: var(--content-max);
}

.project-card {
    background: linear-gradient(135deg, rgba(22, 22, 26, 0.95) 0%, rgba(15, 15, 18, 0.8) 100%);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--space-xl);
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(74, 158, 255, 0.08), transparent 50%);
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-smooth);
}

.project-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent), rgba(138, 99, 210, 0.5), transparent);
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-smooth);
}

.project-card:hover {
    border-color: rgba(74, 158, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(74, 158, 255, 0.2), 0 0 40px rgba(74, 158, 255, 0.15);
}

.project-card:hover::before,
.project-card:hover::after {
    opacity: 1;
}

/* Different accent colors for each project */
.project-card:nth-child(2)::before {
    background: radial-gradient(circle at top right, rgba(138, 99, 210, 0.08), transparent 50%);
}

.project-card:nth-child(2)::after {
    background: linear-gradient(90deg, transparent, rgba(138, 99, 210, 0.8), var(--color-accent), transparent);
}

.project-card:nth-child(2):hover {
    border-color: rgba(138, 99, 210, 0.3);
    box-shadow: 0 12px 32px rgba(138, 99, 210, 0.2), 0 0 40px rgba(138, 99, 210, 0.15);
}

.project-title {
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.project-subtitle {
    font-size: var(--text-base);
    color: var(--color-accent);
    margin-bottom: var(--space-md);
    font-weight: 500;
    text-shadow: 0 0 20px rgba(74, 158, 255, 0.3);
}

/* Purple accent for second project */
.project-card:nth-child(2) .project-subtitle {
    color: #8a63d2;
    text-shadow: 0 0 20px rgba(138, 99, 210, 0.3);
}

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

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.project-link {
    color: var(--color-accent);
    font-weight: 500;
    font-size: var(--text-sm);
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
}

.project-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width var(--duration-base) var(--ease-smooth);
}

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

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

/* ============================================
   WRITING SECTION
   ============================================ */
.writing-intro {
    max-width: var(--content-max);
    margin-bottom: var(--space-xl);
}

.writing-intro p {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
}

.articles-grid {
    display: grid;
    gap: var(--space-xl);
    max-width: var(--content-max);
}

.article-card {
    padding: var(--space-lg);
    background: linear-gradient(135deg, rgba(22, 22, 26, 0.95) 0%, rgba(15, 15, 18, 0.8) 100%);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.article-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent), rgba(138, 99, 210, 0.6), transparent);
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-smooth);
}

.article-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(74, 158, 255, 0.15), 0 0 40px rgba(74, 158, 255, 0.1);
}

.article-card:hover::before {
    opacity: 1;
}

.article-date {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.article-title {
    margin-bottom: var(--space-sm);
}

.article-title a {
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    font-weight: 600;
    transition: color var(--duration-base) var(--ease-smooth);
}

.article-title a:hover {
    color: var(--color-accent);
}

.article-excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.article-tag {
    display: inline-block;
    padding: 4px var(--space-sm);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: var(--text-xs);
    font-family: var(--font-mono);
    color: var(--color-text-tertiary);
}

.writing-cta {
    margin-top: var(--space-xl);
    text-align: center;
}

.cta-link {
    display: inline-block;
    color: var(--color-accent);
    font-weight: 500;
    font-size: var(--text-base);
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
}

.cta-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width var(--duration-base) var(--ease-smooth);
}

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

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

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-content {
    max-width: var(--content-max);
}

.contact-text {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(26, 26, 26, 0.5) 100%);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.contact-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-accent);
    transform: translateX(-3px);
    transition: transform var(--duration-base) var(--ease-smooth);
}

.contact-link:hover {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(26, 26, 26, 0.7) 100%);
    border-color: var(--color-accent-dim);
    color: var(--color-text-primary);
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.contact-link:hover::before {
    transform: translateX(0);
}

.contact-link svg {
    transition: transform var(--duration-base) var(--ease-smooth);
}

.contact-link:hover svg {
    transform: scale(1.1);
}

.contact-link svg {
    flex-shrink: 0;
}

/* ============================================
   GITHUB ACTIVITY - COMPACT VERSION
   ============================================ */
.github-activity-compact {
    margin-top: var(--space-2xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--color-border);
}

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

.github-profile-link {
    font-size: var(--text-sm);
    color: var(--color-accent);
    font-family: var(--font-mono);
    transition: all var(--duration-base) var(--ease-smooth);
    opacity: 0.8;
}

.github-profile-link:hover {
    opacity: 1;
    transform: translateX(4px);
}

.github-stats-compact {
    display: flex;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.stat-compact {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-compact-value {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    font-family: var(--font-mono);
}

.stat-compact-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: var(--font-mono);
}

.github-contribution-graph {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: linear-gradient(135deg, rgba(22, 22, 26, 0.5) 0%, rgba(15, 15, 18, 0.3) 100%);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--duration-base) var(--ease-smooth);
}

.github-contribution-graph:hover {
    border-color: var(--color-border-hover);
    background: linear-gradient(135deg, rgba(22, 22, 26, 0.7) 0%, rgba(15, 15, 18, 0.5) 100%);
}

.github-contribution-graph img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
    opacity: 0.9;
    transition: opacity var(--duration-base) var(--ease-smooth);
}

.github-contribution-graph:hover img {
    opacity: 1;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.3;
}

.footer p {
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

.footer a {
    color: var(--color-accent);
    transition: color var(--duration-base) var(--ease-smooth);
}

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

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

/* Mobile Menu Styles */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background-color: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-lg);
        display: flex;
        flex-direction: column;
        gap: var(--space-md);
        transform: translateY(-100%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
        pointer-events: none;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        z-index: 999;
    }

    /* Light theme mobile menu */
    [data-theme="light"] .nav-menu {
        background-color: rgba(255, 255, 255, 0.98);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-menu li {
        text-align: center;
    }

    .nav-link {
        font-size: var(--text-base);
        display: block;
        padding: var(--space-sm);
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    body.nav-open {
        overflow: hidden;
    }
}

/* Keyboard navigation focus styles */
body.keyboard-nav *:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

body:not(.keyboard-nav) *:focus {
    outline: none;
}

/* Active nav link indicator */
.nav-link.active {
    color: var(--color-accent);
}

/* Mobile-specific styles */
@media (max-width: 768px) {
    /* Hero section adjustments */
    .hero {
        min-height: auto;
        padding-top: calc(var(--nav-height) + var(--space-lg));
        padding-bottom: var(--space-xl);
    }

    .hero::before,
    .hero::after {
        width: 350px;
        height: 350px;
        filter: blur(70px);
    }

    .hero-content {
        padding: var(--space-xl) 0;
    }

    .hero-links {
        gap: var(--space-sm);
    }

    .hero-link {
        flex: 1 1 calc(50% - var(--space-sm));
        min-width: 130px;
        justify-content: center;
        min-height: 48px;
        padding: var(--space-sm);
    }

    .hero-link svg {
        width: 16px;
        height: 16px;
        flex-shrink: 0;
    }

    /* Section spacing */
    .section {
        padding: var(--space-2xl) 0;
    }

    .section-title {
        font-size: var(--text-xl);
    }

    /* Container padding */
    .container {
        padding: 0 var(--space-md);
    }

    /* Timeline adjustments */
    .timeline-item {
        padding-left: var(--space-lg);
    }

    .timeline-section li {
        font-size: var(--text-sm);
    }

    .timeline-content {
        padding: var(--space-md);
    }

    /* Project cards - better mobile layout */
    .projects-grid {
        gap: var(--space-lg);
    }

    .project-card {
        padding: var(--space-lg);
    }

    .project-title {
        font-size: var(--text-lg);
    }

    .project-links {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .project-link {
        display: inline-block;
    }

    /* Article cards */
    .articles-grid {
        gap: var(--space-lg);
    }

    .article-card {
        padding: var(--space-md);
    }

    .article-title a {
        font-size: var(--text-lg);
    }

    /* Contact links - stack vertically with better touch targets */
    .contact-links {
        gap: var(--space-md);
    }

    .contact-link {
        width: 100%;
        min-height: 56px;
        padding: var(--space-md);
        font-size: var(--text-sm);
    }

    .contact-link svg {
        flex-shrink: 0;
    }

    /* Skills grid */
    .skills-grid {
        gap: var(--space-xs);
    }

    .skill-tag {
        font-size: var(--text-xs);
        padding: 6px var(--space-sm);
        min-height: 32px;
        display: flex;
        align-items: center;
    }

    /* Decorative orbs - reduce for performance */
    #about::before {
        width: 300px;
        height: 250px;
        filter: blur(70px);
    }

    #experience::before {
        width: 280px;
        height: 280px;
        filter: blur(70px);
    }

    #projects::before,
    #projects::after {
        width: 280px;
        height: 280px;
        filter: blur(70px);
    }

    #writing::before {
        width: 280px;
        height: 280px;
        filter: blur(70px);
    }

    #contact::before {
        width: 300px;
        height: 280px;
        filter: blur(70px);
    }

    /* GitHub section */
    .github-stats-compact {
        gap: var(--space-md);
        justify-content: space-between;
    }

    .stat-compact-value {
        font-size: var(--text-lg);
    }

    .github-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    /* GitHub contribution graph - scale to fit on mobile */
    .github-contribution-graph {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
    }

    .github-contribution-graph img {
        min-width: 500px;
        max-width: none;
    }

    /* Education cards */
    .education-item {
        padding: var(--space-md);
    }

    .education-item h4 {
        font-size: var(--text-base);
    }

    /* Footer */
    .footer {
        padding: var(--space-lg) 0;
    }

    .footer p {
        font-size: var(--text-xs);
    }

    /* Writing intro */
    .writing-intro p {
        font-size: var(--text-base);
    }

    /* Contact text */
    .contact-text {
        font-size: var(--text-base);
    }

    /* About content - better line height for mobile reading */
    .about-content p {
        line-height: 1.7;
    }
}

/* Extra small mobile devices */
@media (max-width: 480px) {
    .hero-link {
        flex: 1 1 100%;
        width: 100%;
    }

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

    .nav-brand-img {
        width: 36px;
        height: 36px;
    }

    .github-stats-compact {
        gap: var(--space-sm);
    }

    /* Hero section - tighter spacing on small screens */
    .hero-content {
        padding: var(--space-lg) 0;
    }

    .hero-title {
        font-size: clamp(1.75rem, 1.5rem + 2vw, 2.5rem);
    }

    .hero-subtitle {
        font-size: var(--text-lg);
    }

    .hero-description {
        font-size: var(--text-base);
    }

    /* Section titles - prevent overflow */
    .section-title {
        font-size: var(--text-lg);
        word-break: break-word;
    }

    /* Timeline - more compact on small screens */
    .timeline-title {
        font-size: var(--text-lg);
    }

    .timeline-content {
        padding: var(--space-sm);
    }

    .timeline-section li {
        padding-left: var(--space-sm);
        font-size: var(--text-xs);
    }

    /* Tech tags - wrap better */
    .tech-stack {
        gap: 4px;
    }

    .tech-tag {
        font-size: 10px;
        padding: 3px 6px;
    }

    /* Project cards */
    .project-card {
        padding: var(--space-md);
    }

    .project-title {
        font-size: var(--text-base);
    }

    .project-subtitle {
        font-size: var(--text-sm);
    }

    .project-description {
        font-size: var(--text-sm);
    }

    /* Article cards */
    .article-title a {
        font-size: var(--text-base);
    }

    .article-excerpt {
        font-size: var(--text-sm);
    }

    /* GitHub contribution graph - hide on very small screens */
    .github-contribution-graph {
        padding: var(--space-sm);
    }

    /* Education */
    .education {
        margin-top: var(--space-xl);
    }

    .education-item h4 {
        font-size: var(--text-sm);
    }

    .education-institution {
        font-size: var(--text-sm);
    }

    /* Container - reduce padding */
    .container {
        padding: 0 var(--space-sm);
    }

    /* Decorative orbs - smaller on tiny screens */
    .hero::before,
    .hero::after {
        width: 250px;
        height: 250px;
        filter: blur(60px);
    }

    #about::before,
    #experience::before,
    #projects::before,
    #projects::after,
    #writing::before,
    #contact::before {
        width: 200px;
        height: 200px;
        filter: blur(50px);
    }
}

/* ============================================
   SCROLL HELPERS
   ============================================ */

/* Scroll Progress Indicator */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-bright, #6bb3ff));
    z-index: 10001;
    transition: width 0.1s ease-out;
    box-shadow: 0 0 10px var(--color-accent);
}

/* Scroll-to-Top Button */
.scroll-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--duration-base) var(--ease-smooth);
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

.scroll-to-top:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(74, 158, 255, 0.3);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

.scroll-to-top svg {
    transition: transform var(--duration-base) var(--ease-smooth);
}

.scroll-to-top:hover svg {
    transform: translateY(-2px);
}

/* Section Navigation Dots */
.section-dots {
    position: fixed;
    right: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    z-index: 1000;
    padding: var(--space-sm);
}

.section-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: transparent;
    border: 2px solid var(--color-border);
    cursor: pointer;
    transition: all var(--duration-base) var(--ease-smooth);
    position: relative;
}

.section-dot::before {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: 50%;
    background: var(--color-accent);
    transform: scale(0);
    transition: transform var(--duration-base) var(--ease-smooth);
}

.section-dot:hover {
    border-color: var(--color-accent);
    transform: scale(1.2);
}

.section-dot.active {
    border-color: var(--color-accent);
}

.section-dot.active::before {
    transform: scale(1);
}

/* Hide dots on mobile for cleaner experience */
@media (max-width: 768px) {
    .section-dots {
        display: none;
    }

    .scroll-to-top {
        right: var(--space-md);
        bottom: var(--space-lg);
        width: 44px;
        height: 44px;
    }
}

/* Medium devices (tablets, large phones in landscape) */
@media (min-width: 481px) and (max-width: 768px) {
    .hero-link {
        flex: 1 1 calc(50% - var(--space-sm));
    }

    .github-stats-compact {
        justify-content: flex-start;
        gap: var(--space-lg);
    }

    .stat-compact {
        min-width: 80px;
    }

    .contact-link {
        font-size: var(--text-base);
    }
}

/* Standard iPhone sizes (375-414px) */
@media (min-width: 375px) and (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

    .hero-link {
        flex: 1 1 calc(50% - var(--space-xs));
        min-width: 120px;
        font-size: var(--text-sm);
    }

    .github-stats-compact {
        justify-content: space-between;
        width: 100%;
    }

    .stat-compact {
        flex: 1;
        text-align: center;
    }

    .stat-compact-value {
        font-size: var(--text-base);
    }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .scroll-progress {
        transition: none;
    }

    .scroll-to-top {
        transition: opacity var(--duration-base) var(--ease-smooth),
                    visibility var(--duration-base) var(--ease-smooth);
    }

    .scroll-to-top:hover {
        transform: translateY(0);
    }

    .section-dot {
        transition: border-color var(--duration-base) var(--ease-smooth);
    }

    .section-dot:hover {
        transform: none;
    }

    /* Disable decorative animations on reduced motion */
    .hero::before,
    .hero::after,
    #about::before,
    #experience::before,
    #projects::before,
    #projects::after,
    #writing::before,
    #contact::before {
        animation: none;
    }

    .timeline-marker {
        animation: none;
    }
}

/* Landscape orientation on mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding-top: calc(var(--nav-height) + var(--space-md));
        padding-bottom: var(--space-md);
    }

    .hero-content {
        padding: var(--space-md) 0;
    }

    .hero-title {
        font-size: var(--text-xl);
        margin-bottom: var(--space-xs);
    }

    .hero-subtitle {
        font-size: var(--text-base);
        margin-bottom: var(--space-sm);
    }

    .hero-description {
        font-size: var(--text-sm);
        margin-bottom: var(--space-md);
    }

    .hero-links {
        gap: var(--space-xs);
    }

    .hero-link {
        padding: var(--space-xs) var(--space-sm);
        min-height: 40px;
        font-size: var(--text-xs);
    }

    .section {
        padding: var(--space-lg) 0;
    }

    .nav-menu {
        max-height: calc(100vh - var(--nav-height));
        overflow-y: auto;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    /* Disable hover effects that don't work well on touch */
    .hero-link:hover,
    .project-card:hover,
    .article-card:hover,
    .timeline-content:hover,
    .contact-link:hover,
    .skill-tag:hover {
        transform: none;
    }

    /* Add active states instead */
    .hero-link:active {
        transform: scale(0.98);
        opacity: 0.9;
    }

    .project-card:active,
    .article-card:active {
        transform: scale(0.99);
    }

    .contact-link:active {
        transform: translateX(2px);
    }

    /* Ensure adequate touch targets */
    .nav-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .project-link,
    .cta-link {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }
}

/* ============================================
   UTILITIES
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Smooth scroll offset for fixed nav */
html {
    scroll-padding-top: calc(var(--nav-height) + var(--space-md));
}

/* ============================================
   SAFE AREA INSETS (for notched devices)
   ============================================ */
@supports (padding: env(safe-area-inset-bottom)) {
    .nav {
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }

    .footer {
        padding-bottom: calc(var(--space-xl) + env(safe-area-inset-bottom));
    }

    .scroll-to-top {
        bottom: calc(var(--space-xl) + env(safe-area-inset-bottom));
        right: calc(var(--space-xl) + env(safe-area-inset-right));
    }

    @media (max-width: 768px) {
        .container {
            padding-left: max(var(--space-md), env(safe-area-inset-left));
            padding-right: max(var(--space-md), env(safe-area-inset-right));
        }

        .scroll-to-top {
            bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
            right: calc(var(--space-md) + env(safe-area-inset-right));
        }

        .nav-menu {
            padding-left: env(safe-area-inset-left);
            padding-right: env(safe-area-inset-right);
        }
    }

    @media (max-width: 480px) {
        .container {
            padding-left: max(var(--space-sm), env(safe-area-inset-left));
            padding-right: max(var(--space-sm), env(safe-area-inset-right));
        }
    }
}