/* ==========================================
   🎨 Design System - CSS Variables
   ========================================== */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-alt: #12121a;
    --color-bg-elevated: #1a1a24;
    --color-surface: #22222e;
    
    --color-text: #e4e4e7;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    
    --color-primary: #10b981;
    --color-primary-light: #34d399;
    --color-primary-dark: #059669;
    --color-primary-glow: rgba(16, 185, 129, 0.15);
    
    --color-accent: #06b6d4;
    --color-accent-light: #22d3ee;
    
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    
    /* Typography */
    --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-chinese: 'Noto Sans SC', var(--font-sans);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --header-height: 72px;
    
    /* Animation */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    
    --duration-fast: 150ms;
    --duration-base: 300ms;
    --duration-slow: 500ms;
    --duration-slower: 800ms;
    
    /* Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px var(--color-primary-glow);
}

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

/* GPU acceleration for animations */
.hero-bg, .shape, .terminal-window, .project-image-wrapper, 
.project-video-wrapper, .skills-category, .highlight-item {
    will-change: transform;
}

/* Optimize image rendering */
img, video {
    content-visibility: auto;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    font-size: 16px;
    text-rendering: optimizeSpeed;
}

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

body.zh {
    font-family: var(--font-chinese);
}

::selection {
    background: var(--color-primary);
    color: var(--color-bg);
}

a {
    color: inherit;
    text-decoration: none;
}

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

button {
    font: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

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

/* ==========================================
   ✨ Cursor Glow Effect
   ========================================== */
.cursor-glow {
    position: fixed;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-primary-glow), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    transform: translate(-50%, -50%);
    transition: opacity var(--duration-slow) var(--ease-out-expo);
}

.cursor-glow.visible {
    opacity: 1;
}

@media (max-width: 768px) {
    .cursor-glow {
        display: none;
    }
}

/* ==========================================
   📊 Progress Bar
   ========================================== */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    z-index: 10001;
    transition: width 50ms linear;
}

/* ==========================================
   🌐 Language Toggle
   ========================================== */
.lang-toggle {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 4px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    transition: all var(--duration-base) var(--ease-out-expo);
}

.lang-toggle:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.lang-indicator {
    position: absolute;
    width: 28px;
    height: 28px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: transform var(--duration-base) var(--ease-out-expo);
    z-index: 0;
    left: 4px;
    top: 50%;
    transform: translateY(-50%);
}

.lang-toggle[data-lang="zh"] .lang-indicator {
    transform: translateY(-50%) translateX(28px);
}

.lang-option {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--duration-fast);
    position: relative;
    z-index: 1;
    line-height: 1;
}

.lang-option.active {
    color: var(--color-bg);
    font-weight: 600;
}

@media (max-width: 768px) {
    .lang-toggle {
        top: auto;
        bottom: var(--space-lg);
        right: var(--space-lg);
    }
}

/* ==========================================
   🧭 Navigation
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    transition: all var(--duration-base) var(--ease-out-expo);
}

.header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    opacity: 0;
    transition: opacity var(--duration-base);
}

.header.scrolled::before {
    opacity: 1;
}

.header.scrolled {
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    position: relative;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    transition: transform var(--duration-base) var(--ease-out-expo);
}

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

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

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--duration-fast);
    position: relative;
}

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

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

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

/* Hamburger Menu */
.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background var(--duration-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: inherit;
    transition: transform var(--duration-base) var(--ease-out-expo);
}

.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: translateY(8px) rotate(45deg);
    background: var(--color-text);
}

.nav-toggle.active .hamburger::after {
    transform: translateY(-8px) rotate(-45deg);
    background: var(--color-text);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: min(75vw, 300px);
        height: 100vh;
        background: var(--color-bg-alt);
        padding: calc(var(--header-height) + var(--space-2xl)) var(--space-xl) var(--space-2xl);
        transform: translateX(100%);
        transition: transform var(--duration-slow) var(--ease-out-expo);
        border-left: 1px solid var(--color-border);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-lg);
    }
    
    .nav-link {
        font-size: 1.1rem;
    }
}

/* ==========================================
   🦸 Hero Section
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    opacity: 0.5;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 70% 30%, var(--color-primary-glow) 0%, transparent 50%),
                radial-gradient(ellipse at 30% 70%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}

.floating-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--color-primary);
    top: 10%;
    right: 20%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--color-accent);
    bottom: 20%;
    left: 10%;
    animation-delay: -7s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: #a855f7;
    top: 50%;
    left: 30%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(20px, -30px) scale(1.05); }
    50% { transform: translate(-10px, 20px) scale(0.95); }
    75% { transform: translate(30px, 10px) scale(1.02); }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
    padding: var(--space-4xl) 0;
}

.hero-text {
    max-width: 600px;
}

.hero-greeting {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.name-first {
    display: block;
    color: var(--color-text);
}

.name-last {
    display: block;
    color: var(--color-text-secondary);
}

.hero-tagline {
    font-size: clamp(1.25rem, 3vw, 2rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tagline-dynamic {
    position: relative;
    display: inline-block;
    min-width: 280px;
    height: 1.4em;
    overflow: hidden;
    vertical-align: bottom;
}

@media (max-width: 480px) {
    .tagline-dynamic {
        min-width: 180px;
    }
}

.tagline-word {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    color: var(--color-primary);
    opacity: 0;
    transform: translateY(100%);
    animation: word-rotate 9s var(--ease-in-out) infinite;
    white-space: nowrap;
}

.tagline-word:nth-child(1) { animation-delay: 0s; }
.tagline-word:nth-child(2) { animation-delay: 3s; }
.tagline-word:nth-child(3) { animation-delay: 6s; }

@keyframes word-rotate {
    0%, 5% {
        opacity: 0;
        transform: translateY(100%);
    }
    10%, 28% {
        opacity: 1;
        transform: translateY(0);
    }
    33%, 100% {
        opacity: 0;
        transform: translateY(-100%);
    }
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
    max-width: 500px;
}

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

/* Terminal Window */
.hero-visual {
    display: flex;
    justify-content: center;
}

.terminal-window {
    width: 100%;
    max-width: 420px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transition: transform var(--duration-slow) var(--ease-out-expo),
                box-shadow var(--duration-slow);
}

.terminal-window:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.terminal-header {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.terminal-buttons {
    display: flex;
    gap: var(--space-sm);
}

.terminal-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.btn-close { background: #ff5f57; }
.btn-minimize { background: #febc2e; }
.btn-maximize { background: #28c840; }

.terminal-title {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.terminal-body {
    padding: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.terminal-line {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.prompt {
    color: var(--color-primary);
}

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

.terminal-output {
    color: var(--color-text-secondary);
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
}

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

.skill-item {
    color: var(--color-accent);
}

.skill-item::before {
    content: '• ';
    color: var(--color-text-muted);
}

.terminal-output.highlight {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 1.5rem;
}

.terminal-line.typing {
    margin-bottom: 0;
}

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

@keyframes blink {
    50% { opacity: 0; }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    animation: float-vertical 2s ease-in-out infinite;
}

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

.scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 1.5s ease-in-out infinite;
}

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

@keyframes float-vertical {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-8px); }
}

/* Mobile Hero */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-3xl);
        text-align: center;
    }
    
    .hero-text {
        max-width: none;
    }
    
    .hero-description {
        max-width: none;
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .terminal-window {
        max-width: 360px;
    }
}

@media (max-width: 768px) {
    .hero-tagline {
        flex-direction: column;
        align-items: center;
        text-align: center;
        width: 100%;
        gap: var(--space-xs);
        padding: 0 var(--space-lg);
    }
    
    .tagline-dynamic {
        display: block;
        min-width: 220px;
        text-align: center;
    }
    
    .tagline-word {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .scroll-indicator {
        display: none;
    }
    
    .hero-name {
        font-size: 2.5rem;
    }
    
    .hero-tagline {
        font-size: 1.1rem;
    }
}

/* ==========================================
   🔘 Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--duration-base) var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity var(--duration-base);
}

.btn:hover::before {
    opacity: 1;
}

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

.btn-primary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.btn-ghost {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-ghost:hover {
    background: var(--color-primary-glow);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1rem;
}

.btn-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--duration-base) var(--ease-out-expo);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ==========================================
   📑 Section Styles
   ========================================== */
.section {
    padding: var(--space-4xl) 0;
    position: relative;
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    margin-bottom: var(--space-3xl);
    white-space: nowrap;
}

.section-title.center {
    justify-content: center;
    flex-direction: column;
    gap: var(--space-sm);
}

.title-number {
    font-family: var(--font-mono);
    color: var(--color-primary);
    font-size: 0.9em;
}

.title-line {
    flex: 1;
    max-width: 300px;
    height: 1px;
    background: var(--color-border);
}

/* Animation Classes */
.reveal-text,
.reveal-scale {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--duration-slower) var(--ease-out-expo),
                transform var(--duration-slower) var(--ease-out-expo);
}

.reveal-scale {
    transform: translateY(30px) scale(0.95);
}

.reveal-text.visible,
.reveal-scale.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Stagger Animation */
.stagger-1 { transition-delay: 100ms; }
.stagger-2 { transition-delay: 200ms; }
.stagger-3 { transition-delay: 300ms; }
.stagger-4 { transition-delay: 400ms; }
.stagger-5 { transition-delay: 500ms; }

/* ==========================================
   👤 About Section
   ========================================== */
.about-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: var(--space-4xl);
    align-items: start;
}

.about-intro {
    font-size: 1.25rem;
    color: var(--color-text);
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

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

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--duration-base) var(--ease-out-expo);
}

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

.highlight-icon {
    font-size: 1.5rem;
}

.highlight-number {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: block;
}

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

/* About Image */
.about-image {
    position: relative;
}

.image-wrapper {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.image-wrapper img {
    border-radius: var(--radius-lg);
    filter: grayscale(20%);
    transition: filter var(--duration-base);
}

.image-wrapper:hover img {
    filter: grayscale(0%);
}

.image-border {
    position: absolute;
    inset: 15px -15px -15px 15px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    z-index: -1;
    transition: all var(--duration-base) var(--ease-out-expo);
}

.image-wrapper:hover .image-border {
    inset: 10px -10px -10px 10px;
}

.image-dots {
    position: absolute;
    width: 80px;
    height: 80px;
    bottom: -20px;
    right: -30px;
    background-image: radial-gradient(var(--color-primary) 2px, transparent 2px);
    background-size: 10px 10px;
    opacity: 0.5;
}

@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-3xl);
    }
    
    .about-image {
        order: -1;
    }
    
    .image-wrapper {
        max-width: 250px;
    }
}

@media (max-width: 640px) {
    .about-highlights {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   💼 Experience Section
   ========================================== */
.experience {
    background: var(--color-bg-alt);
}

.experience-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-2xl);
}

.exp-tabs {
    display: flex;
    flex-direction: column;
    position: relative;
}

.exp-tab {
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    text-align: left;
    border-left: 2px solid var(--color-border);
    transition: all var(--duration-base);
    white-space: nowrap;
}

.exp-tab:hover {
    color: var(--color-primary);
    background: var(--color-primary-glow);
}

.exp-tab.active {
    color: var(--color-primary);
}

.tab-indicator {
    position: absolute;
    left: 0;
    width: 2px;
    height: 42px;
    background: var(--color-primary);
    transition: transform var(--duration-base) var(--ease-out-expo);
}

.exp-panel {
    display: none;
    animation: fadeIn var(--duration-base) var(--ease-out-expo);
}

.exp-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(10px); }
    to { opacity: 1; transform: translateX(0); }
}

.exp-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.exp-company {
    color: var(--color-primary);
}

.exp-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.exp-list li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.exp-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.exp-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.exp-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
    .experience-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .exp-tabs {
        flex-direction: row;
        overflow-x: auto;
        border-bottom: 2px solid var(--color-border);
        padding-bottom: 0;
    }
    
    .exp-tab {
        border-left: none;
        border-bottom: 2px solid transparent;
        margin-bottom: -2px;
    }
    
    .exp-tab.active {
        border-bottom-color: var(--color-primary);
    }
    
    .tab-indicator {
        display: none;
    }
}

/* ==========================================
   🚀 Projects Section
   ========================================== */
.featured-projects {
    display: flex;
    flex-direction: column;
    gap: var(--space-4xl);
}

.featured-project {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.featured-project.reverse {
    direction: rtl;
}

.featured-project.reverse > * {
    direction: ltr;
}

.project-overline {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.project-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.project-description {
    background: var(--color-bg-elevated);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-lg);
}

.project-description p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.project-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.project-tech-list li {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.project-badge {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-primary-glow);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--color-primary);
}

.project-image {
    position: relative;
}

.project-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transition: transform var(--duration-slow) var(--ease-out-expo);
}

.project-image-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-primary-glow);
    opacity: 0.5;
    z-index: 1;
    transition: opacity var(--duration-base);
}

.project-image-wrapper:hover::before {
    opacity: 0;
}

.project-image-wrapper:hover {
    transform: scale(1.02);
}

.project-image-wrapper img {
    width: 100%;
    height: auto;
    transition: transform var(--duration-slow) var(--ease-out-expo);
}

.project-image-wrapper:hover img {
    transform: scale(1.05);
}

/* Project Video */
.project-video-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    cursor: pointer;
    transition: transform var(--duration-slow) var(--ease-out-expo);
}

.project-video-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-primary-glow);
    opacity: 0.5;
    z-index: 1;
    transition: opacity var(--duration-base);
    pointer-events: none;
}

.project-video-wrapper:hover::before,
.project-video-wrapper.playing::before {
    opacity: 0;
}

.project-video-wrapper:hover {
    transform: scale(1.02);
}

.project-video-wrapper video {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--duration-slow) var(--ease-out-expo);
}

.project-video-wrapper:hover video {
    transform: scale(1.05);
}

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    background: rgba(0, 0, 0, 0.7);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    transition: all var(--duration-base) var(--ease-out-expo);
}

.video-play-btn svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
    margin-left: 4px;
}

.project-video-wrapper:hover .video-play-btn {
    background: var(--color-primary);
    transform: translate(-50%, -50%) scale(1.1);
}

.project-video-wrapper:hover .video-play-btn svg {
    color: var(--color-bg);
}

.project-video-wrapper.playing .video-play-btn {
    opacity: 0;
    pointer-events: none;
}

@media (max-width: 1024px) {
    .featured-project,
    .featured-project.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }
    
    .project-image {
        order: -1;
    }
    
    .project-description {
        background: transparent;
        padding: 0;
        box-shadow: none;
    }
}

/* ==========================================
   🛠️ Skills Section
   ========================================== */
.skills {
    background: var(--color-bg-alt);
}

.skills-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
}

.skills-category {
    padding: var(--space-xl);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--duration-base) var(--ease-out-expo);
}

.skills-category:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.category-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.category-icon svg {
    width: 100%;
    height: 100%;
}

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

.skill-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    transition: all var(--duration-fast);
}

.skill-item:hover {
    color: var(--color-primary);
    background: var(--color-primary-glow);
}

@media (max-width: 768px) {
    .skills-content {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   📧 Contact Section
   ========================================== */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-heading {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.contact-text {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-2xl);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.contact-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--duration-base) var(--ease-out-expo);
}

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

.contact-link:hover {
    color: var(--color-primary);
    transform: translateY(-4px);
}

/* ==========================================
   🦶 Footer
   ========================================== */
.footer {
    padding: var(--space-xl);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer-copyright {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ==========================================
   📱 Additional Mobile Styles
   ========================================== */
@media (max-width: 480px) {
    :root {
        --space-4xl: 4rem;
    }
    
    .section {
        padding: var(--space-3xl) 0;
    }
    
    .section-title {
        flex-wrap: wrap;
    }
    
    .title-line {
        width: 100%;
        max-width: none;
        order: 1;
        margin-top: var(--space-sm);
    }
}

/* ==========================================
   🎨 Print Styles
   ========================================== */
@media print {
    .header, .loader, .lang-toggle, .cursor-glow, .progress-bar,
    .hero-bg, .scroll-indicator, .floating-shapes {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .section {
        padding: 1rem 0;
        page-break-inside: avoid;
    }
}