:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #0d0d12;
    --bg-card: rgba(255, 255, 255, 0.02);
    --accent: #22d3ee;
    --accent-dim: rgba(34, 211, 238, 0.15);
    --accent-glow: rgba(34, 211, 238, 0.4);
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-dim: #71717a;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(34, 211, 238, 0.3);
    --font-main: 'Space Grotesk', system-ui, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Effects */
.bg-effects {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.bg-effects::before {
    content: '';
    position: absolute;
    width: 800px;
    height: 800px;
    top: -200px;
    right: -200px;
    background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
    animation: drift 15s ease-in-out infinite;
}

.bg-effects::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    bottom: -150px;
    left: -150px;
    background: radial-gradient(circle, rgba(14, 116, 144, 0.2) 0%, transparent 70%);
    animation: drift 20s ease-in-out infinite reverse;
}

@keyframes drift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, 20px) scale(1.1); }
}

.grid-bg {
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    z-index: -2;
}

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.25rem 2rem;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

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

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

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

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

.nav-links a.active::before {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent);
}

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

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

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform 0.4s ease;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu a {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
}

.mobile-menu a:hover {
    color: var(--accent);
}

.mobile-menu .close-btn {
    margin-top: 2rem;
    padding: 0.75rem 2rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.875rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--accent-dim);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

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

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

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    margin-bottom: 1rem;
}

.hero-title .accent {
    background: linear-gradient(135deg, var(--accent), #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 2.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    padding: 0.875rem 1.75rem;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px var(--accent-glow);
}

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

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

.hero-social {
    display: flex;
    gap: 1.5rem;
    margin-top: 3rem;
}

.hero-social a {
    color: var(--text-dim);
    transition: var(--transition);
}

.hero-social a:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

.hero-social svg {
    width: 20px;
    height: 20px;
}

/* Sections */
.section {
    padding: 6rem 2rem;
    border-top: 1px solid var(--border);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-secondary);
}

/* Skills Grid */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.skill-tag {
    padding: 0.625rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-tag:hover {
    border-color: var(--border-hover);
    background: var(--accent-dim);
    color: var(--text-primary);
    transform: scale(1.02);
}

/* Contact Section */
.contact {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.contact p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    padding: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Portfolio Page */
.page-header {
    padding: 10rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.page-header .breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-family: monospace;
    color: var(--text-dim);
    margin-bottom: 1rem;
}

.page-header .breadcrumb span {
    color: var(--accent);
}

.page-header h1 {
    font-size: clamp(2rem, 6vw, 3.5rem);
    margin-bottom: 1rem;
}

.page-header h1 span {
    color: var(--accent);
}

.page-header p {
    color: var(--text-secondary);
    max-width: 600px;
    font-size: 1.125rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
}

.stat-card {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-card .label {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

/* Filter Buttons */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--accent);
    background: var(--accent-dim);
    color: var(--accent);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    padding-bottom: 4rem;
}

.project-card {
    position: relative;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: var(--transition);
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-dim) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition);
}

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

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

.project-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.project-card .icon-box {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
}

.project-card .card-stats {
    display: flex;
    gap: 0.75rem;
}

.project-card .stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-dim);
}

.project-card .stat svg {
    width: 14px;
    height: 14px;
}

.project-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.project-card .description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-card .card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.project-card .language {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-dim);
}

.project-card .language .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.project-card .time {
    font-size: 0.75rem;
    color: var(--text-dim);
}

.project-card .card-link {
    position: absolute;
    inset: 0;
}

/* Loading State */
.loading {
    text-align: center;
    padding: 4rem;
}

.loading .spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.loading p {
    font-size: 0.875rem;
    color: var(--text-dim);
    font-family: monospace;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }
.fade-in-delay-4 { animation-delay: 0.4s; }

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: #27272a;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

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

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

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .section {
        padding: 4rem 1.5rem;
    }

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