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

/* Variables */
:root {
    --bg: #0a0a0a;
    --bg-elevated: #0f0f0f;
    --text: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --border: rgba(255, 255, 255, 0.1);
    --space: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --radius: 8px;
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--space-lg);
}

h3 {
    font-size: 1.125rem;
}

p {
    color: var(--text-dim);
}

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

ul {
    list-style: none;
}

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

/* Focus */
:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.9);
    border-bottom: 1px solid var(--border);
    transition: padding var(--transition), background var(--transition);
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.header-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: padding var(--transition);
}

.header.scrolled .header-content {
    padding: 0.75rem var(--space-lg);
}

.logo {
    font-weight: 600;
    font-size: 1.125rem;
}

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

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: transform 0.2s;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

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

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

.nav a {
    color: var(--text-dim);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

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

.nav a.active {
    color: var(--text);
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
}

/* Hero */
.hero {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    padding-top: 6rem;
    text-align: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.15;
    filter: grayscale(1);
}

.hero .container {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin: var(--space) 0 var(--space-lg);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

/* Sections */
section {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
}

section h2 {
    text-align: center;
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
}

/* Buttons */
.btn, .btn-outline {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    cursor: pointer;
}

.btn {
    background: var(--text);
    color: var(--bg);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.15);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Grid */
.grid {
    display: grid;
    gap: var(--space);
}

#services .grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

#portfolio .grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

#contact .grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    margin: var(--space-lg) 0;
}

/* Cards */
.card {
    background: var(--bg-elevated);
    padding: var(--space-lg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: transform var(--transition), border-color var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.15);
}

#services .card svg {
    margin-bottom: var(--space);
}

#services .card h3 {
    margin-bottom: 0.5rem;
}

#portfolio .card {
    padding: 0;
    overflow: hidden;
}

#portfolio .card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    opacity: 0.6;
}

#portfolio .card > div {
    padding: var(--space-lg);
}

#portfolio .card h3 {
    margin-bottom: 0.5rem;
}

#contact .card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
}

#contact .card strong {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#contact .card a {
    color: var(--text-dim);
    transition: color 0.2s;
}

#contact .card a:hover {
    color: var(--text);
}

/* About Feature */
.about-feature {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    align-items: center;
}

.about-feature img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    opacity: 0.7;
}

.about-feature h3 {
    font-size: 1.75rem;
    margin-bottom: var(--space);
}

.about-feature p {
    margin-bottom: var(--space);
}

.features {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: var(--space);
}

.features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-dim);
}

.features svg {
    flex-shrink: 0;
}

#about .grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Timeline */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.timeline > div {
    background: var(--bg-elevated);
    padding: var(--space-lg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    position: relative;
    padding-left: 3rem;
}

.timeline > div::before {
    content: '';
    position: absolute;
    left: var(--space);
    top: var(--space-lg);
    width: 12px;
    height: 12px;
    background: var(--text);
    border-radius: 50%;
}

.timeline > div h3 {
    margin-bottom: 0.5rem;
}

/* CTA */
.cta {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
}

.cta h2 {
    margin-bottom: var(--space);
}

.cta p {
    margin-bottom: var(--space-lg);
}

/* Social */
.social {
    display: flex;
    gap: var(--space);
    justify-content: center;
    margin-top: var(--space-lg);
}

.social a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-dim);
    transition: color var(--transition), transform var(--transition), border-color var(--transition);
}

.social a:hover {
    color: var(--text);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Footer */
footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-grid strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.footer-grid p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-grid nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-grid a {
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: color 0.2s;
}

.footer-grid a:hover {
    color: var(--text);
}

.copyright {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    padding-top: var(--space);
    border-top: 1px solid var(--border);
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --space: 0.875rem;
        --space-lg: 1.5rem;
        --space-xl: 2.5rem;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(10, 10, 10, 0.98);
        border-top: 1px solid var(--border);
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav a {
        padding: var(--space) var(--space-lg);
        border-bottom: 1px solid var(--border);
    }
    
    .nav a:hover {
        background: var(--bg-elevated);
    }
    
    .hero {
        min-height: 60vh;
    }
    
    .about-feature {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .about-feature img {
        height: 250px;
    }
    
    #services .grid,
    #portfolio .grid,
    #about .grid,
    #contact .grid {
        grid-template-columns: 1fr;
    }
    
    .timeline > div {
        padding-left: var(--space-lg);
    }
    
    .timeline > div::before {
        left: 0.5rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--text);
    color: var(--bg);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
    z-index: 90;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .reveal {
        opacity: 1;
        transform: none;
    }
    
    .btn:hover,
    .card:hover,
    .social a:hover,
    .back-to-top:hover {
        transform: none;
    }
}