:root {
    /* Colors - Professional Minimalist Palette */
    --color-bg: #0a0a0a;
    --color-surface: #111111;
    --color-border: #1a1a1a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #666666;
    --color-accent: #ffffff;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', var(--font-primary);

    /* Spacing */
    --spacing-unit: 8px;
    --container-padding: clamp(20px, 5vw, 80px);

    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out-circ: cubic-bezier(0.85, 0, 0.15, 1);

    /* Z-index */
    --z-intro: 9999;
    --z-nav: 1000;
    --z-content: 1;
}

/* Light Theme */
[data-theme="light"] {
    --color-bg: #ffffff;
    --color-surface: #f8f8f8;
    --color-border: #e5e5e5;
    --color-text-primary: #0a0a0a;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-accent: #0a0a0a;
}

[data-theme="light"] .nav.scrolled {
    background: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .intro-overlay {
    background: #ffffff;
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.5s var(--ease-out-expo), color 0.5s var(--ease-out-expo);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Cinematic Intro Overlay */
.intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-bg);
    z-index: var(--z-intro);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: introFadeOut 1s ease 3s forwards;
    pointer-events: none;
}

.intro-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.intro-content {
    text-align: center;
    animation: introZoom 2.5s var(--ease-out-expo) forwards;
}

.intro-logo {
    font-size: clamp(60px, 10vw, 120px);
    font-weight: 800;
    font-family: var(--font-display);
    margin-bottom: 30px;
    opacity: 0;
    animation: fadeInUp 1s ease 0.3s forwards;
}

.intro-title {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 600;
    font-family: var(--font-display);
    margin-bottom: 10px;
    opacity: 0;
    animation: fadeInUp 1s ease 0.6s forwards;
}

.intro-subtitle {
    font-size: clamp(14px, 2vw, 18px);
    color: var(--color-text-secondary);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeInUp 1s ease 0.9s forwards;
}

.intro-loader {
    width: 200px;
    height: 2px;
    background: var(--color-border);
    margin: 40px auto 0;
    border-radius: 2px;
    overflow: hidden;
    opacity: 0;
    animation: fadeIn 0.5s ease 1.2s forwards;
}

.loader-bar {
    height: 100%;
    background: var(--color-accent);
    width: 0;
    animation: loadProgress 1.5s ease 1.5s forwards;
}

@keyframes introFadeOut {
    to {
        opacity: 0;
        visibility: hidden;
    }
}

@keyframes introZoom {
    0% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes loadProgress {
    to {
        width: 100%;
    }
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    padding: 30px 0;
    transition: all 0.6s var(--ease-out-expo);
    opacity: 0;
    animation: fadeIn 0.8s ease 3.5s forwards;
}

.nav.scrolled {
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    font-family: var(--font-display);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.nav-logo:hover {
    opacity: 0.6;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 50px;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.05em;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width 0.4s var(--ease-out-expo);
}

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

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

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    padding: 10px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 44px;
    height: 44px;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
}

.theme-icon {
    font-size: 18px;
    position: absolute;
    transition: all 0.4s var(--ease-out-expo);
}

.theme-icon-dark {
    opacity: 0;
    transform: rotate(-180deg) scale(0);
}

.theme-icon-light {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-icon-dark {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-icon-light {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    pointer-events: none;
}

.hero-grid {
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(50px, 50px);
    }
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
    position: relative;
    z-index: var(--z-content);
}

.hero-content {
    max-width: 900px;
    opacity: 0;
    animation: fadeInUp 1.2s var(--ease-out-expo) 3.8s forwards;
}

.hero-label {
    font-size: 12px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: 30px;
    font-weight: 500;
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 700;
    font-family: var(--font-display);
    line-height: 1.1;
    margin-bottom: 40px;
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
    overflow: hidden;
}

.title-line::after {
    content: '';
    display: block;
    height: 2px;
    background: var(--color-accent);
    width: 0;
    margin-top: 10px;
    animation: lineGrow 1s var(--ease-out-expo) 4.5s forwards;
}

.title-line:last-child::after {
    animation-delay: 4.7s;
}

@keyframes lineGrow {
    to {
        width: 100px;
    }
}

.hero-description {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin-bottom: 50px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 60px;
    margin-bottom: 60px;
    justify-content: start;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.stat-value {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    font-family: var(--font-display);
    line-height: 1;
}

.stat-label {
    font-size: 12px;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-cta {
    display: flex;
    gap: 20px;
}

.btn {
    padding: 16px 32px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 0;
    transition: all 0.4s var(--ease-out-expo);
    display: inline-block;
    letter-spacing: 0.05em;
    border: 1px solid transparent;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.scroll-hint {
    position: absolute;
    bottom: 60px;
    left: var(--container-padding);
    display: flex;
    align-items: center;
    gap: 20px;
    color: var(--color-text-tertiary);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeIn 1s ease 5s forwards;
}

.scroll-line {
    width: 60px;
    height: 1px;
    background: var(--color-text-tertiary);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--color-accent);
    animation: scrollLineMove 2s ease-in-out infinite;
}

@keyframes scrollLineMove {
    to {
        left: 100%;
    }
}

/* Section Styles */
.section {
    padding: clamp(80px, 15vh, 160px) 0;
    position: relative;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 30px;
    margin-bottom: clamp(60px, 10vh, 100px);
}

.section-number {
    font-size: 14px;
    color: var(--color-text-tertiary);
    font-family: var(--font-display);
    font-weight: 600;
}

.section-title {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: clamp(60px, 10vw, 120px);
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.text-large {
    font-size: clamp(20px, 2.5vw, 28px);
    line-height: 1.6;
    color: var(--color-text-primary);
}

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

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

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.highlight {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.highlight-number {
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 700;
    font-family: var(--font-display);
}

.highlight-text {
    font-size: 12px;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.about-skills {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.skill-group {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.skill-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-list span {
    padding: 8px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-size: 13px;
    color: var(--color-text-secondary);
    transition: all 0.3s ease;
}

.skill-list span:hover {
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* Experience Section */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 60px;
    max-width: 1000px;
}

.timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.timeline-date {
    font-size: 14px;
    color: var(--color-text-tertiary);
    font-family: var(--font-display);
    font-weight: 500;
    padding-top: 4px;
}

.timeline-title {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 600;
    margin-bottom: 8px;
    font-family: var(--font-display);
}

.timeline-company {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    font-size: 16px;
}

.timeline-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.timeline-list li {
    color: var(--color-text-secondary);
    line-height: 1.7;
    padding-left: 24px;
    position: relative;
}

.timeline-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-text-tertiary);
}

.timeline-list strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.timeline-tags span {
    padding: 6px 14px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-size: 12px;
    color: var(--color-text-tertiary);
}

/* Projects Section */
.projects-grid {
    display: grid;
    gap: 60px;
}

.project-card {
    padding: clamp(40px, 6vw, 60px);
    border: 1px solid var(--color-border);
    transition: all 0.6s var(--ease-out-expo);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width 0.6s var(--ease-out-expo);
}

.project-card:hover {
    border-color: var(--color-border);
    transform: translateX(10px);
}

.project-card:hover::before {
    width: 100%;
}

.project-number {
    font-size: 14px;
    color: var(--color-text-tertiary);
    font-family: var(--font-display);
    font-weight: 600;
    margin-bottom: 20px;
}

.project-title {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 600;
    font-family: var(--font-display);
    margin-bottom: 20px;
}

.project-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.project-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}

.project-list li {
    color: var(--color-text-secondary);
    line-height: 1.7;
    padding-left: 20px;
    position: relative;
    font-size: 15px;
}

.project-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-text-tertiary);
}

.project-list strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.project-tech span {
    padding: 6px 14px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-size: 12px;
    color: var(--color-text-tertiary);
}

/* Contact Section */
.contact-content {
    max-width: 900px;
}

.contact-text {
    font-size: clamp(18px, 2.5vw, 24px);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 60px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 30px 0;
    border-top: 1px solid var(--color-border);
    text-decoration: none;
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateX(10px);
}

.contact-label {
    font-size: 12px;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-value {
    font-size: 16px;
    color: var(--color-text-primary);
    font-weight: 500;
}

/* Footer */
.footer {
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        gap: 40px;
    }

    .about-highlights {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        gap: 30px;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        text-align: center;
    }

    .section-header {
        gap: 20px;
    }
}

/* Scroll Animations */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: all 1s var(--ease-out-expo);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}