/* ===== CSS Variables ===== */
:root {
    --color-bg: #0a0a0f;
    --color-bg-elevated: #12121a;
    --color-bg-card: #16161f;
    --color-surface: #1a1a24;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-text: #f0f0f5;
    --color-text-muted: #8888a0;
    --color-text-subtle: #5a5a70;
    --color-primary: #6366f1;
    --color-primary-glow: rgba(99, 102, 241, 0.4);
    --color-accent: #a855f7;
    --color-gradient-start: #6366f1;
    --color-gradient-end: #a855f7;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --container-width: 1200px;
}

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

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

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

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

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

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

/* ===== Typography ===== */
.gradient-text {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 500px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(168, 85, 247, 0.1), transparent);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-title-line {
    display: block;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: 100px;
    font-weight: 600;
    font-size: 1rem;
    color: white;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 0 40px var(--color-primary-glow);
}

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

.cta-button svg {
    transition: transform var(--transition-fast);
}

.cta-button:hover svg {
    transform: translate(3px, -3px);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-subtle);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-text-subtle), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Portfolio ===== */
.portfolio {
    padding: 120px 0;
    background: var(--color-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 60px;
}

.project-card {
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
    opacity: 0;
    transform: translateY(40px);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px var(--color-primary-glow);
}

.project-image-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 10, 15, 0.9) 0%, transparent 50%);
    pointer-events: none;
}

.project-content {
    padding: 28px;
}

.project-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

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

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    padding: 10px 20px;
    border-radius: 100px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.project-link:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.project-link svg {
    transition: transform var(--transition-fast);
}

.project-link:hover svg {
    transform: translate(2px, -2px);
}

/* ===== About ===== */
.about {
    padding: 120px 0;
    background: var(--color-bg-elevated);
}

.about-content {
    max-width: 700px;
}

.about-text {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 48px;
}

.about-stats {
    display: flex;
    gap: 60px;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

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

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.125rem;
}

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

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .nav-links {
        gap: 20px;
    }

    .hero {
        padding: 100px 0 60px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .project-content {
        padding: 20px;
    }

    .project-title {
        font-size: 1.25rem;
    }

    .about-stats {
        gap: 40px;
    }

    .stat-number {
        font-size: 2.25rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}