/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161f;
    --bg-card-hover: #1c1c28;
    --bg-code: #0d1117;
    
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
    
    --border-color: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.1);
    
    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-code: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-max: 1200px;
    --nav-height: 72px;
    
    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

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

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

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

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

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

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

@keyframes fadeLeft {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeRight {
    from { opacity: 0; transform: translateX(-40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes glow {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

@keyframes scrollDown {
    0% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(6px); opacity: 0.3; }
    100% { transform: translateY(0); opacity: 1; }
}

[data-animate] {
    opacity: 0;
    transform: translateY(30px);
}

[data-animate].visible {
    animation: fadeUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

[data-animate="fade-left"].visible {
    animation: fadeLeft 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

[data-animate="fade-right"].visible {
    animation: fadeRight 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

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

.nav-logo {
    font-family: var(--font-code);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    transition: var(--transition);
}

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

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-github {
    display: flex;
    align-items: center;
    padding: 8px 12px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

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

.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);
}

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

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

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 40%, transparent 100%);
}

.hero-glow {
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse, var(--accent-glow), transparent 70%);
    animation: glow 4s ease-in-out infinite;
}

.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    min-height: 1.5em;
    font-family: var(--font-code);
    font-weight: 400;
}

.typewriter::after {
    content: '|';
    animation: pulse 1s step-end infinite;
    color: var(--accent-primary);
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.8;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-body);
    border-radius: 12px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 8px 18px;
    font-size: 0.8rem;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

/* Stats */
.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

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

/* Hero Card */
.hero-visual {
    display: flex;
    justify-content: center;
}

.hero-card {
    background: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    width: 100%;
    max-width: 440px;
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
}

.card-dots {
    display: flex;
    gap: 6px;
}

.card-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.card-dots span:nth-child(1) { background: #ef4444; }
.card-dots span:nth-child(2) { background: #eab308; }
.card-dots span:nth-child(3) { background: #22c55e; }

.card-title {
    font-family: var(--font-code);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.card-code {
    padding: 20px;
    font-family: var(--font-code);
    font-size: 0.82rem;
    line-height: 1.8;
    overflow-x: auto;
}

.card-code code {
    font-family: inherit;
}

.code-key { color: #79c0ff; }
.code-string { color: #a5d6ff; }
.code-keyword { color: #ff7b72; }
.code-class { color: #ffa657; }
.code-annotation { color: #d2a8ff; }
.code-comment { color: #8b949e; }

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

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

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

/* ===========================
   Section Styles
   =========================== */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 60px;
}

.section-tag {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 500;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.section-line {
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

/* ===========================
   About Section
   =========================== */
.about-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 60px;
    align-items: start;
}

.image-wrapper {
    position: relative;
    width: 280px;
    height: 280px;
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 16px;
    position: relative;
    z-index: 1;
    filter: grayscale(20%);
    transition: var(--transition);
}

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

.image-border {
    position: absolute;
    top: 12px;
    left: 12px;
    right: -12px;
    bottom: -12px;
    border: 2px solid var(--accent-primary);
    border-radius: 16px;
    opacity: 0.3;
    transition: var(--transition);
}

.image-wrapper:hover .image-border {
    top: 8px;
    left: 8px;
    opacity: 0.5;
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

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

.about-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 28px;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
}

.detail {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.detail svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.skill-category:hover {
    border-color: rgba(99, 102, 241, 0.2);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}

.skill-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 12px;
    color: var(--accent-primary);
    margin-bottom: 20px;
}

.skill-category h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.skill-tag {
    padding: 4px 12px;
    font-size: 0.78rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-category:hover .skill-tag {
    border-color: rgba(99, 102, 241, 0.15);
}

/* ===========================
   Projects Section
   =========================== */
/* Featured Project */
.featured-project {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.featured-project::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
}

.featured-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 14px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.featured-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.featured-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.featured-description {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 20px;
    line-height: 1.8;
}

.featured-description strong {
    color: var(--text-primary);
}

.featured-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.featured-tech span {
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 500;
    font-family: var(--font-code);
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: 6px;
    color: var(--accent-primary);
}

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

.featured-preview {
    display: flex;
    justify-content: center;
}

/* Code Window */
.code-window {
    background: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    width: 100%;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    font-family: var(--font-code);
    font-size: 0.7rem;
    color: var(--text-muted);
}

.code-dots {
    display: flex;
    gap: 5px;
}

.code-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.code-dots span:nth-child(1) { background: #ef4444; }
.code-dots span:nth-child(2) { background: #eab308; }
.code-dots span:nth-child(3) { background: #22c55e; }

.code-content {
    padding: 16px;
    font-family: var(--font-code);
    font-size: 0.75rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content code {
    font-family: inherit;
}

/* Project Cards Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    border-color: rgba(99, 102, 241, 0.2);
    background: var(--bg-card-hover);
    transform: translateY(-6px);
}

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

.project-icon {
    color: var(--accent-primary);
}

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

.project-links a {
    color: var(--text-muted);
    transition: var(--transition);
}

.project-links a:hover {
    color: var(--accent-primary);
}

.project-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 20px;
    flex-grow: 1;
    line-height: 1.7;
}

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

.project-tech span {
    font-family: var(--font-code);
    font-size: 0.72rem;
    color: var(--text-muted);
}

.project-tech span::before {
    content: '#';
    color: var(--accent-primary);
    margin-right: 2px;
}

.projects-cta {
    text-align: center;
    margin-top: 48px;
}

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

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition);
    text-align: left;
}

.contact-card:hover {
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}

.contact-card svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.contact-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.contact-value {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
}

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

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

.footer-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.footer-text strong {
    color: var(--text-primary);
}

.footer-copyright {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.heart {
    color: #ef4444;
    display: inline-block;
    animation: pulse 1.5s ease-in-out infinite;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-card {
        max-width: 380px;
    }
    
    .featured-content {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }
    
    .about-details {
        align-items: center;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 70px 0;
        --nav-height: 64px;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        padding: 40px;
        gap: 4px;
        transition: var(--transition);
        border-left: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-link {
        font-size: 1rem;
        padding: 12px 16px;
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 2.8rem);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 16px;
        align-items: center;
    }
    
    .stat {
        align-items: center;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .featured-project {
        padding: 24px;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-card {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .scroll-indicator {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-badge {
        font-size: 0.72rem;
    }
    
    .hero-card {
        max-width: 100%;
    }
    
    .card-code {
        font-size: 0.72rem;
    }
    
    .image-wrapper {
        width: 220px;
        height: 220px;
    }
}