/* CSS Reset and Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Warm Gray + Sage Green Theme */
    --primary-color: #4a5d23;
    --secondary-color: #3a4a1c;
    --accent-color: #d97645;
    --warm-yellow: #f4c430;
    --brick-red: #b85450;
    --text-primary: #2c2c2c;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #fefefe;
    --bg-secondary: #f8f6f1;
    --bg-warm: #f5f3ed;
    --bg-dark: #2c2c2c;
    --border-color: #e8e6e0;
    --shadow-light: 0 2px 8px rgba(74, 93, 35, 0.08);
    --shadow-medium: 0 4px 16px rgba(74, 93, 35, 0.12);
    --shadow-large: 0 8px 32px rgba(74, 93, 35, 0.16);
    
    /* Typography */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --transition: all 0.3s ease;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    outline: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

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

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

/* Side Anchor Navigation */
.anchor-nav {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.anchor-link {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.anchor-link:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.anchor-link.active {
    background: var(--primary-color);
    color: white;
}

.anchor-icon {
    font-size: 16px;
    line-height: 1;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-medium);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    outline: none;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.logo-dot {
    width: 6px;
    height: 6px;
    background-color: var(--accent-color);
    border-radius: 50%;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active,
.nav-link:focus {
    color: var(--primary-color);
    outline: none;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    outline: none;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--spacing-2xl);
    background: linear-gradient(135deg, var(--bg-warm) 0%, var(--bg-secondary) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* Hero decorative layers */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(1200px 1200px at 12% 18%, rgba(255, 167, 38, 0.16) 0%, rgba(255, 167, 38, 0) 55%),
        radial-gradient(1000px 1000px at 88% 62%, rgba(86, 119, 252, 0.16) 0%, rgba(86, 119, 252, 0) 55%);
    animation: heroBlobs 18s ease-in-out infinite alternate;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.25;
    background-image: radial-gradient(rgba(0, 0, 0, 0.06) 1px, transparent 1px);
    background-size: 28px 28px;
    background-position: 0 0;
}

@keyframes heroBlobs {
    0% { background-position: 12% 18%, 88% 62%; }
    100% { background-position: 18% 24%, 82% 58%; }
}

/* Ensure content stays above decorations */
.hero-container {
    position: relative;
    z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
    .hero::before { animation: none; }
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.highlight {
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
}

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

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
}

.stat:nth-child(2) .stat-number {
    color: var(--accent-color);
}

.stat:nth-child(3) .stat-number {
    color: var(--brick-red);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-avatar {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    border: 8px solid white;
    box-shadow: var(--shadow-large);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Hero avatar rotation */
.hero-avatar {
    animation: heroSpin 12s linear infinite;
    will-change: transform;
    transition: transform 300ms ease;
}

.hero-avatar:hover,
.hero-avatar:focus-visible {
    animation: none;
    transform: rotate(0deg) scale(1.06);
}

@keyframes heroSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    .hero-avatar { animation: none; }
}

/* Experience Section */
.experience {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-warm) 100%);
}

.section-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.experience-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.experience-card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-large);
}

.experience-card.current-job {
    border: 2px solid var(--primary-color);
    box-shadow: 0 8px 32px rgba(74, 93, 35, 0.15);
}

.experience-card.current-job:hover {
    box-shadow: 0 12px 48px rgba(74, 93, 35, 0.25);
}

.card-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.current-job .card-header {
    background: linear-gradient(135deg, rgba(74, 93, 35, 0.05) 0%, rgba(217, 118, 69, 0.05) 100%);
}

.job-period {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.period-text {
    background: var(--primary-color);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.current-badge {
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 16px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    animation: pulse-badge 2s infinite;
}

@keyframes pulse-badge {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.company-info {
    text-align: right;
}

.company-info h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.company-info h4 {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

.card-content {
    padding: var(--spacing-xl);
}

.achievements {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    transition: background-color 0.3s ease;
}

.achievement-item:hover {
    background: rgba(74, 93, 35, 0.05);
}

.achievement-item i {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    margin-top: 2px;
    flex-shrink: 0;
}

.achievement-item span {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-base);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-tag {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 6px 14px;
    border-radius: 16px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: transform 0.2s ease;
}

.skill-tag:hover {
    transform: translateY(-2px);
}

/* Core Capabilities Section */
.core-capabilities {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-primary);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

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

.capability-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.capability-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.capability-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.capability-icon i {
    font-size: var(--font-size-xl);
    color: white;
}

.capability-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-xl);
}

.capability-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.capability-card ul {
    list-style: none;
    padding: 0;
}

.capability-card li {
    color: var(--text-secondary);
    padding: 4px 0;
    position: relative;
    padding-left: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.capability-card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* About Section */
.about {
    background-color: var(--bg-warm);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.about-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.about-header h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.about-intro {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.info-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-section {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.info-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.info-section:nth-child(2) {
    border-left-color: var(--accent-color);
}

.info-section:nth-child(3) {
    border-left-color: var(--brick-red);
}

.info-section:nth-child(4) {
    border-left-color: var(--warm-yellow);
}

.info-section:nth-child(5) {
    border-left-color: var(--primary-color);
}

.info-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.highlight-section {
    background: linear-gradient(135deg, rgba(74, 93, 35, 0.05) 0%, rgba(217, 118, 69, 0.05) 100%);
    border-left-color: var(--accent-color) !important;
}

.advantage-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.advantage-tag {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 4px 12px;
    border-radius: 16px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.highlight-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.highlight-item i {
    font-size: var(--font-size-3xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.highlight-item h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.highlight-item p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-large);
}

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.project-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: var(--transition);
}

.project-link:hover {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.project-link--disabled {
    color: var(--text-secondary);
    border-color: var(--border-color);
    background: rgba(255, 255, 255, 0.7);
    pointer-events: none;
    cursor: not-allowed;
}

.project-card:hover .project-link--disabled {
    background: rgba(255, 255, 255, 0.7);
    color: var(--text-secondary);
    transform: none;
}

.project-content {
    padding: var(--spacing-lg);
}

.project-content h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.project-content p {
    margin-bottom: var(--spacing-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    padding: 4px 12px;
    background-color: var(--bg-secondary);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.tag:nth-child(2) {
    background-color: rgba(244, 196, 48, 0.15);
    color: var(--warm-yellow);
}

.tag:nth-child(3) {
    background-color: rgba(184, 84, 80, 0.15);
    color: var(--brick-red);
}

.project-results {
    display: flex;
    gap: var(--spacing-lg);
}

.result {
    text-align: center;
}

.result-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

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

.skills-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.skills-category {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.skills-category h3 {
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--text-primary);
}

.skill-item {
    margin-bottom: var(--spacing-lg);
}

.skill-name {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

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

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    width: 0;
    transition: width 1s ease-in-out;
}

.skills-tools {
    grid-column: 1 / -1;
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.skills-tools h3 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-lg);
}

.tool-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.tool-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.tool-item i {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.tool-item span {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
    padding-left: 80px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 21px;
    top: 0;
    width: 18px;
    height: 18px;
    background-color: var(--primary-color);
    border: 4px solid white;
    border-radius: 50%;
    box-shadow: var(--shadow-medium);
}

.timeline-date {
    position: absolute;
    left: -60px;
    top: 0;
    background-color: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    white-space: nowrap;
}

.timeline-content {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.timeline-content ul {
    padding-left: var(--spacing-lg);
    margin-top: var(--spacing-sm);
}

.timeline-content li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

/* Contact Section */
.contact {
    background-color: var(--bg-secondary);
}

.contact-simple {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    margin-bottom: var(--spacing-xl);
}

.contact-intro h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-2xl);
}

.contact-intro p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    line-height: 1.6;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.contact-item i {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    width: 24px;
    text-align: center;
}

.contact-item span {
    color: var(--text-secondary);
    font-weight: 500;
}

/* WeChat QR Code */
.wechat-item {
    position: relative;
}

.wechat-qr {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-large);
    border: 2px solid var(--primary-color);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    margin-bottom: 10px;
    width: 200px;
    text-align: center;
}

.wechat-qr::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--primary-color);
}

.wechat-item:hover .wechat-qr {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-10px);
}

.wechat-qr img {
    width: 150px;
    height: 150px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
}

.wechat-qr p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
    font-weight: 500;
}

/* Footer */
.footer {
    background-color: var(--bg-dark);
    color: white;
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.footer-content p {
    margin-bottom: var(--spacing-xs);
    color: #d1d5db;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 1000;
}

.back-to-top:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.back-to-top.show {
    display: flex;
}

/* Chat Button */
.chat-button {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 1000;
}

.chat-button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }

    .anchor-nav {
        display: none;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    /* Navigation */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: white;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-xl);
        transition: left 0.3s ease;
        box-shadow: var(--shadow-medium);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    /* Hero */
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-avatar {
        width: 250px;
        height: 250px;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    /* About */
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .info-column {
        gap: var(--spacing-md);
    }
    
    .info-section {
        padding: var(--spacing-sm);
    }
    
    .info-section h4 {
        font-size: var(--font-size-base);
    }
    
    /* Experience */
    .experience-cards {
        gap: var(--spacing-lg);
    }
    
    .card-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .company-info {
        text-align: center;
    }
    
    .company-info h3 {
        font-size: var(--font-size-lg);
    }
    
    .card-content {
        padding: var(--spacing-lg);
    }
    
    .achievement-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .achievement-item i {
        align-self: center;
    }

    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Skills */
    .skills-content {
        grid-template-columns: 1fr;
    }

    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Timeline */
    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 60px;
    }

    .timeline-item::before {
        left: 11px;
    }

    .timeline-date {
        position: static;
        display: inline-block;
        margin-bottom: var(--spacing-sm);
    }

    /* Core Capabilities */
    .capabilities-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    /* Contact */
    .contact-info-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .capabilities-grid {
        grid-template-columns: 1fr;
    }

    .project-results {
        justify-content: center;
    }
    
    .contact-info-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    /* Chat button mobile adjustment */
    .chat-button {
        bottom: 75px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    /* Experience Small Screen */
    .card-header {
        padding: var(--spacing-md);
    }
    
    .card-content {
        padding: var(--spacing-md);
    }
    
    .period-text {
        font-size: var(--font-size-xs);
        padding: 4px 12px;
    }
    
    .current-badge {
        font-size: var(--font-size-xs);
        padding: 3px 8px;
    }
    
    .company-info h3 {
        font-size: var(--font-size-base);
        line-height: 1.4;
    }
    
    .skill-tag {
        font-size: var(--font-size-xs);
        padding: 4px 10px;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Smooth Scrolling Enhancements */
@media (prefers-reduced-motion: no-preference) {
    * {
        scroll-behavior: smooth;
    }
}

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .back-to-top,
    .contact-form {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero,
    .about,
    .skills,
    .contact {
        background: white;
    }
}