/* ========================================
   XU KANG - Personal Portfolio
   Premium Dark Theme with Neon Accents
   ======================================== */

/* === CSS Custom Properties === */
:root {
    /* Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #0f1428;
    --bg-tertiary: #151b33;
    --bg-card: rgba(15, 20, 40, 0.7);
    --bg-glass: rgba(15, 20, 40, 0.5);
    
    --text-primary: #e8ecf4;
    --text-secondary: #8892a8;
    --text-muted: #5a6580;
    
    --accent-purple: #7c3aed;
    --accent-purple-light: #a78bfa;
    --accent-cyan: #06b6d4;
    --accent-cyan-light: #67e8f9;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    
    --gradient-primary: linear-gradient(135deg, #7c3aed 0%, #06b6d4 100%);
    --gradient-text: linear-gradient(135deg, #a78bfa 0%, #67e8f9 100%);
    --gradient-glow: linear-gradient(135deg, rgba(124, 58, 237, 0.4) 0%, rgba(6, 182, 212, 0.4) 100%);
    
    --border-color: rgba(124, 58, 237, 0.15);
    --border-hover: rgba(124, 58, 237, 0.4);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.2);
    --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.2);
    
    /* Typography */
    --font-primary: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Sizing */
    --nav-height: 72px;
    --container-max: 1200px;
    --section-padding: 120px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-purple) var(--bg-secondary);
}

html::-webkit-scrollbar {
    width: 6px;
}

html::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

html::-webkit-scrollbar-thumb {
    background: var(--accent-purple);
    border-radius: 3px;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* === Canvas & Effects === */
#three-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

#three-bg canvas {
    display: block;
}

#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    display: none; /* Hidden when Three.js is active */
}

.cursor-glow {
    position: fixed;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
    transform: translate(-50%, -50%);
    transition: opacity 0.3s ease;
    opacity: 0;
}

body:hover .cursor-glow {
    opacity: 1;
}

/* === Clean Hero Name (no gimmicks) === */
.hero-name {
    position: relative;
}

/* === Neon Pulse for Section Titles === */
.section-title {
    text-shadow: 0 0 10px rgba(167, 139, 250, 0.3),
                 0 0 40px rgba(124, 58, 237, 0.1);
}

/* === Animated Gradient Border === */
@keyframes border-rotate {
    0%   { --angle: 0deg; }
    100% { --angle: 360deg; }
}

@property --angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

.skill-category,
.github-stat-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid transparent;
    background-clip: padding-box;
}

.skill-category::before,
.github-stat-card::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px; right: -1px; bottom: -1px;
    background: conic-gradient(from var(--angle), transparent 60%, var(--accent-purple) 80%, var(--accent-cyan) 90%, transparent 100%);
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.5s;
    animation: border-rotate 4s linear infinite;
}

.skill-category:hover::before,
.github-stat-card:hover::before {
    opacity: 1;
}

/* === Enhanced 3D Card Effects === */
.project-card-inner,
.timeline-content,
.code-window {
    transform-style: preserve-3d;
    perspective: 1000px;
}

.project-card:hover .project-card-inner {
    box-shadow: 
        var(--shadow-glow),
        0 20px 60px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* === Holographic Shimmer === */
.hero-badge {
    position: relative;
    overflow: hidden;
}

.hero-badge::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(124, 58, 237, 0.08) 45%,
        rgba(6, 182, 212, 0.12) 50%,
        rgba(124, 58, 237, 0.08) 55%,
        transparent 70%
    );
    animation: holographic-shimmer 3s ease-in-out infinite;
    pointer-events: none;
}

@keyframes holographic-shimmer {
    0%   { transform: translateX(-100%) rotate(45deg); }
    100% { transform: translateX(100%) rotate(45deg); }
}

/* === Floating Animation for Shapes === */
.shape {
    animation-timing-function: ease-in-out !important;
    filter: blur(60px);
}

/* === Container === */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* === Navbar === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 2px;
    transition: var(--transition-base);
}

.nav-logo:hover {
    color: var(--accent-purple-light);
}

.logo-bracket {
    color: var(--accent-purple);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    position: relative;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-base);
    border-radius: 8px;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: var(--transition-base);
}

.nav-link.active::after,
.nav-link:hover::after {
    width: 20px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-github {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.nav-github:hover {
    color: var(--text-primary);
    border-color: var(--accent-purple);
    background: rgba(124, 58, 237, 0.1);
    transform: translateY(-2px);
}

.nav-cta {
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
    background: var(--accent-purple);
    border-radius: 10px;
    transition: var(--transition-base);
}

.nav-cta:hover {
    transform: translateY(-2px);
    background: #6d28d9;
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}



.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    z-index: 1001;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    color: white;
    background: var(--accent-purple);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
    transform: translateY(-3px);
    background: #6d28d9;
    box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4);
}

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

.btn-secondary:hover {
    background: rgba(124, 58, 237, 0.1);
    border-color: var(--accent-purple);
    transform: translateY(-3px);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid var(--border-hover);
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-outline:hover {
    background: rgba(124, 58, 237, 0.1);
    border-color: var(--accent-purple);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* === Section === */
.section {
    position: relative;
    padding: var(--section-padding) 0;
    z-index: 2;
}

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

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 12px;
    padding: 4px 14px;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 20px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.section-line {
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    margin: 0 auto;
    border-radius: 3px;
}

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--nav-height);
    z-index: 2;
    overflow: hidden;
}

.hero-bg-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: rgba(124, 58, 237, 0.15);
    top: -10%;
    right: -10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: rgba(6, 182, 212, 0.12);
    bottom: 10%;
    left: -5%;
    animation-delay: -7s;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: rgba(236, 72, 153, 0.1);
    top: 50%;
    left: 50%;
    animation-delay: -14s;
}

.shape-4 {
    width: 200px;
    height: 200px;
    background: rgba(124, 58, 237, 0.2);
    bottom: 20%;
    right: 20%;
    animation-delay: -3s;
}

.shape-5 {
    width: 150px;
    height: 150px;
    background: rgba(6, 182, 212, 0.15);
    top: 30%;
    left: 10%;
    animation-delay: -10s;
}

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

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: 30px;
    font-size: 0.85rem;
    color: var(--accent-green);
    margin-bottom: 32px;
}

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

@keyframes pulse-dot {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    50% { opacity: 0.7; box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
}

.hero-title {
    margin-bottom: 24px;
}

.hero-greeting {
    display: block;
    font-size: clamp(1rem, 2vw, 1.2rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 2px;
}

.hero-name {
    display: block;
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 900;
    letter-spacing: 6px;
    line-height: 1.1;
    margin-bottom: 16px;
}

.name-char {
    display: inline-block;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: name-glow 3s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.15s);
}

@keyframes name-glow {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.3); }
}

.name-space {
    display: inline-block;
    width: 20px;
}

.hero-subtitle {
    display: block;
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 500;
    color: var(--accent-cyan);
    min-height: 1.8em;
    margin-top: 8px;
}

.typing-wrapper {
    display: inline-flex;
    align-items: center;
}

.cursor-blink {
    color: var(--accent-purple);
    animation: blink 1s step-end infinite;
    font-weight: 300;
    margin-left: 2px;
}

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

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-plus {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 2px;
    animation: bounce-scroll 2s ease-in-out infinite;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--border-hover);
    border-radius: 12px;
    position: relative;
}

.mouse-wheel {
    width: 3px;
    height: 8px;
    background: var(--accent-purple);
    border-radius: 3px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll-wheel {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(10px); opacity: 0; }
}

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

/* === About Section === */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-intro {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-intro strong {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 32px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition-base);
}

.highlight-item:hover {
    border-color: var(--accent-purple);
    transform: translateX(8px);
    box-shadow: var(--shadow-glow);
}

.highlight-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.highlight-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.highlight-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

/* Code Window */
.code-window {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transition: var(--transition-base);
}

.code-window:hover {
    transform: translateY(-5px) rotate(0.5deg);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(124, 58, 237, 0.3);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.code-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

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

.code-body {
    padding: 24px;
    overflow-x: auto;
}

.code-body pre {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
}

.code-keyword { color: #c792ea; }
.code-var { color: #82aaff; }
.code-key { color: #89ddff; }
.code-string { color: #c3e88d; }

/* === Skills Section === */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.skill-category {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.skill-category:hover {
    border-color: var(--accent-purple);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.skill-category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.skill-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: rgba(124, 58, 237, 0.1);
    color: var(--accent-purple-light);
    flex-shrink: 0;
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: var(--transition-base);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.skill-tag::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: var(--tag-color);
    opacity: 0;
    transition: var(--transition-base);
}

.skill-tag:hover {
    border-color: var(--tag-color, var(--accent-purple));
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.skill-tag:hover::before {
    opacity: 1;
}

/* === Experience Section === */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-purple), var(--accent-cyan), var(--accent-purple));
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

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

.timeline-marker {
    position: absolute;
    left: -40px;
    top: 8px;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-purple);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.3);
    position: relative;
    z-index: 1;
}

.timeline-content {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: all var(--transition-base);
}

.timeline-content:hover {
    border-color: var(--accent-purple);
    transform: translateX(8px);
    box-shadow: var(--shadow-glow);
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-cyan);
}

.timeline-badge {
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.timeline-badge.current {
    background: rgba(16, 185, 129, 0.12);
    color: var(--accent-green);
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 0.9rem;
    color: var(--accent-purple-light);
    margin-bottom: 12px;
}

.timeline-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.timeline-tags span {
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

/* === Projects Section === */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.project-card {
    position: relative;
    border-radius: 16px;
    transition: all var(--transition-base);
}

.project-card-inner {
    position: relative;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
    overflow: hidden;
}

.project-card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(124, 58, 237, 0.06) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.5s;
    pointer-events: none;
}

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

.project-card:hover .project-card-inner {
    border-color: var(--accent-purple);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

.project-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(124, 58, 237, 0.1);
    border-radius: 14px;
    color: var(--accent-purple-light);
    transition: var(--transition-base);
}

.project-card:hover .project-icon {
    background: rgba(124, 58, 237, 0.2);
    transform: scale(1.05);
}

.project-stars {
    font-size: 0.8rem;
    color: var(--accent-orange);
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.star-badge, .fork-badge {
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.lang-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 20px;
    background: rgba(124, 58, 237, 0.15);
    color: var(--text-secondary);
    border: 1px solid rgba(124, 58, 237, 0.2);
    position: relative;
}

.lang-badge::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--lang-color, #8b5cf6);
    margin-right: 4px;
}

.projects-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(124, 58, 237, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

.project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    color: var(--text-muted);
    transition: var(--transition-base);
}

.project-link:hover {
    color: var(--accent-purple-light);
    background: rgba(124, 58, 237, 0.1);
    transform: translateY(-2px);
}

.project-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    transition: var(--transition-base);
}

.project-card:hover .project-title {
    color: var(--accent-purple-light);
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 20px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-tech span {
    padding: 4px 10px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 6px;
}

.projects-cta {
    text-align: center;
}

/* === GitHub Section === */
.github-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.github-stat-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    transition: all var(--transition-base);
}

.github-stat-card:hover {
    border-color: var(--accent-purple);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.github-stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(124, 58, 237, 0.1);
    border-radius: 12px;
    color: var(--accent-purple-light);
    flex-shrink: 0;
}

.github-stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.github-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Contribution Graph */
.github-contribution {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

.contribution-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.contribution-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.contribution-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-purple-light);
    transition: var(--transition-base);
}

.contribution-link:hover {
    color: var(--accent-cyan);
}

.contribution-graph {
    display: grid;
    grid-template-columns: repeat(52, 1fr);
    gap: 3px;
    margin-bottom: 16px;
}

.contrib-cell {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    background: var(--bg-tertiary);
    transition: all 0.15s;
    cursor: pointer;
}

.contrib-cell:hover {
    transform: scale(1.8);
    z-index: 2;
    box-shadow: 0 0 8px rgba(124, 58, 237, 0.5);
}

.contrib-cell.level-1 { background: rgba(124, 58, 237, 0.3); }
.contrib-cell.level-2 { background: rgba(124, 58, 237, 0.5); }
.contrib-cell.level-3 { background: rgba(124, 58, 237, 0.7); }
.contrib-cell.level-4 { background: rgba(124, 58, 237, 1); }

.contribution-legend {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.legend-colors {
    display: flex;
    gap: 3px;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

/* === Contact Section === */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-heading {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.contact-text {
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all var(--transition-base);
}

.contact-method:hover {
    border-color: var(--accent-purple);
    transform: translateX(8px);
    box-shadow: var(--shadow-glow);
}

.contact-method-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: rgba(124, 58, 237, 0.1);
    border-radius: 10px;
    color: var(--accent-purple-light);
    flex-shrink: 0;
}

.contact-method-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.contact-method-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.social-link:hover {
    color: var(--accent-purple-light);
    border-color: var(--accent-purple);
    background: rgba(124, 58, 237, 0.1);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

/* Contact Form */
.contact-form-wrapper {
    padding: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    outline: none;
    transition: all var(--transition-base);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

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

/* === Footer === */
.footer {
    position: relative;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    z-index: 2;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
}

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

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition-base);
}

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

.footer-icp {
    font-size: 0.78rem;
}

.footer-icp a {
    color: var(--text-muted);
    transition: var(--transition-base);
}

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

/* === Animations === */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .github-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
    }
    
    .nav-links,
    .nav-actions {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    /* When menu is open, expand navbar to full screen */
    .navbar.menu-open {
        height: 100vh;
        height: 100dvh;
        background: rgba(10, 14, 26, 0.98) !important;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        justify-content: center;
        align-items: center;
        gap: 20px;
    }
    
    .nav-toggle {
        z-index: 1001;
    }
    
    .nav-links.mobile-open .nav-link {
        font-size: 1.3rem;
        padding: 12px 24px;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .about-grid,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .github-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }
    
    .stat-divider {
        display: none;
    }
    
    .hero-name {
        letter-spacing: 3px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .contribution-graph {
        grid-template-columns: repeat(26, 1fr);
    }
    
    .scroll-indicator {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .github-stats-grid {
        grid-template-columns: 1fr;
    }
    
    .contribution-graph {
        grid-template-columns: repeat(13, 1fr);
    }
}

/* === WeChat QR Code Modal === */
.wechat-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.wechat-modal.active {
    display: flex;
    opacity: 1;
}

.wechat-modal-content {
    position: relative;
    background: linear-gradient(145deg, rgba(15, 20, 40, 0.95), rgba(10, 14, 26, 0.98));
    border: 1px solid rgba(124, 58, 237, 0.3);
    border-radius: 20px;
    padding: 40px 36px;
    max-width: 380px;
    width: 90%;
    text-align: center;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.6),
        0 0 40px rgba(124, 58, 237, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.wechat-modal.active .wechat-modal-content {
    transform: scale(1) translateY(0);
}

.wechat-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.wechat-modal-close:hover {
    background: rgba(236, 72, 153, 0.15);
    border-color: rgba(236, 72, 153, 0.4);
    color: var(--accent-pink);
    transform: rotate(90deg);
}

.wechat-modal-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 28px;
}

.wechat-modal-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.wechat-qr-wrapper {
    background: white;
    border-radius: 16px;
    padding: 16px;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.wechat-qr-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

.wechat-modal-tip {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.wechat-modal-tip-mobile {
    display: none;
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--accent-cyan);
    opacity: 0.8;
}

@media (max-width: 768px) {
    .wechat-modal-tip-mobile {
        display: block;
    }
}

/* WeChat trigger card styling */
.contact-method.wechat-trigger:hover {
    border-color: #07c160;
    box-shadow: 0 4px 20px rgba(7, 193, 96, 0.15);
}

.contact-method.wechat-trigger .contact-method-icon {
    color: #07c160;
}

.contact-method.wechat-trigger .contact-method-value {
    color: var(--accent-cyan);
    font-size: 0.85rem;
}