/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #1a1a1d;
    --bg-card: #151517;
    --bg-card-hover: #1e1e21;

    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-dark: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.3);

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-text: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    --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 40px var(--accent-glow);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --navbar-bg: rgba(10, 10, 11, 0.8);
    --code-keyword: #c678dd;
    --code-variable: #e5c07b;
    --code-property: #e06c75;
    --code-string: #98c379;
}

/* Light Mode Variables */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f9fa;

    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #6c6c8a;

    --accent: #6366f1;
    --accent-light: #4f46e5;
    --accent-dark: #4338ca;
    --accent-glow: rgba(99, 102, 241, 0.2);

    --gradient-text: linear-gradient(135deg, #1a1a2e 0%, #4a4a68 100%);

    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px var(--accent-glow);

    --navbar-bg: rgba(255, 255, 255, 0.9);
    --code-keyword: #8b5cf6;
    --code-variable: #d97706;
    --code-property: #dc2626;
    --code-string: #059669;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

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

ul {
    list-style: none;
}

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

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--navbar-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    transition: var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

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

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-base);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    margin-left: 16px;
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    transform: scale(1.05);
}

.theme-icon {
    font-size: 1.25rem;
    transition: var(--transition-base);
    position: absolute;
}

.theme-icon.sun {
    opacity: 0;
    transform: translateY(20px) rotate(180deg);
}

.theme-icon.moon {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
}

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

[data-theme="light"] .theme-icon.moon {
    opacity: 0;
    transform: translateY(-20px) rotate(-180deg);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px var(--accent-glow);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 120px 24px 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    opacity: 0.4;
    pointer-events: none;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1rem;
    color: var(--accent-light);
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Code Block */
.hero-visual {
    display: flex;
    justify-content: center;
}

.code-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    max-width: 450px;
    width: 100%;
}

.code-header {
    display: flex;
    gap: 8px;
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

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

.dot.red {
    background: #ff5f57;
}

.dot.yellow {
    background: #febc2e;
}

.dot.green {
    background: #28c840;
}

.code-block pre {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-block code {
    color: var(--text-secondary);
}

.code-block .keyword {
    color: var(--code-keyword);
}

.code-block .variable {
    color: var(--code-variable);
}

.code-block .property {
    color: var(--code-property);
}

.code-block .string {
    color: var(--code-string);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    animation: bounce 2s infinite;
}

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

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }

    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

/* ===== Sections ===== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: -0.02em;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 16px auto 0;
    border-radius: 2px;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.stat {
    text-align: center;
    padding: 24px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.about-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

.info-card:hover {
    border-color: var(--accent);
    transform: translateX(8px);
}

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

.info-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    font-size: 0.95rem;
    font-weight: 500;
}

/* ===== Experience Section ===== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

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

.timeline-item {
    position: relative;
    padding-left: 40px;
    padding-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -7px;
    top: 6px;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent-glow);
}

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

.timeline-content:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 0.95rem;
    color: var(--accent-light);
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.timeline-list {
    margin-bottom: 20px;
}

.timeline-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

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

.tag {
    padding: 6px 12px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-light);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ===== Projects Section ===== */
.projects {
    background: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
}

.project-card.featured {
    grid-column: span 1;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.project-icon {
    font-size: 1.75rem;
}

.project-name {
    font-size: 1.15rem;
    font-weight: 600;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.project-tech span {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

/* ===== Skills Section ===== */
.skills-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.skill-category {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.skill-category-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--accent-light);
}

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

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

.skill-name {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.skill-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 1s ease-out;
}

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

.skill-tag {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.skill-tag:hover {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-light);
}

.skill-tag.highlight {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-light);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

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

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-base);
    text-align: left;
}

.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    font-size: 1.75rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 0.9rem;
    font-weight: 500;
}

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

.footer-content {
    text-align: center;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

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

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

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

.animate-on-scroll {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

/* ===== Mobile Navigation ===== */
.nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-color);
}

/* ===== Responsive Design ===== */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-description {
        max-width: 100%;
    }

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

    .hero-visual {
        display: none;
    }

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

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

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

    .nav-toggle {
        display: flex;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        margin-bottom: 40px;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        padding-left: 30px;
    }

    .timeline-marker {
        left: -7px;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .stat {
        padding: 20px;
    }

    .stat-number {
        font-size: 2rem;
    }

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

    .project-card.featured {
        grid-column: span 1;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 16px;
    }

    .hero {
        padding: 100px 16px 40px;
    }

    .container {
        padding: 0 16px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .timeline-header {
        flex-direction: column;
        gap: 8px;
    }

    .timeline-date {
        font-size: 0.8rem;
    }

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