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

:root {
    --bg: #0a0a0f;
    --bg-raised: #0f0f18;
    --bg-card: #12121e;
    --border: #1e1e30;
    --border-hover: #2e2e48;
    --text: #ededf2;
    --text-muted: #8a8a9e;
    --text-dim: #5a5a6e;
    --accent: #4a6cf7;
    --accent-light: #7b93fa;
    --accent-dim: rgba(74, 108, 247, 0.12);
    --accent-glow: rgba(74, 108, 247, 0.3);
    --gradient-start: #4a6cf7;
    --gradient-end: #8b5cf6;
    --radius: 12px;
    --radius-lg: 20px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
    --max-w: 1200px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

/* ===== Nav ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 24px;
    transition: background var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.88);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}

.nav-logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
}

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

.nav-links a {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: color var(--transition), background var(--transition);
}

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

.nav-github {
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-glow {
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, rgba(139, 92, 246, 0.15) 40%, transparent 70%);
    opacity: 0.5;
    filter: blur(80px);
    animation: glow-pulse 6s ease-in-out infinite alternate;
}

@keyframes glow-pulse {
    0% { opacity: 0.4; transform: translateX(-50%) scale(0.95); }
    100% { opacity: 0.6; transform: translateX(-50%) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 780px;
}

.hero-logo {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    margin: 0 auto 24px;
    box-shadow: 0 4px 20px rgba(74, 108, 247, 0.15);
}

.hero-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-light);
    margin-bottom: 24px;
    padding: 6px 16px;
    border: 1px solid var(--accent-dim);
    border-radius: 100px;
    background: var(--accent-dim);
}

.hero-title {
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-accent {
    background: linear-gradient(135deg, var(--gradient-start), var(--accent-light), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 540px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scroll-hint 2s ease-in-out infinite;
}

@keyframes scroll-hint {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
    50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: #fff;
}

.btn-primary:hover {
    box-shadow: 0 4px 30px var(--accent-glow);
    transform: translateY(-1px);
    filter: brightness(1.1);
}

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

.btn-secondary:hover {
    border-color: var(--border-hover);
    background: var(--bg-raised);
    transform: translateY(-1px);
}

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

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

.btn-lg {
    padding: 16px 32px;
    font-size: 1rem;
}

/* ===== Sections ===== */
.section-label {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-light);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 16px;
}

.section-sub {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 520px;
}

.section-header {
    margin-bottom: 56px;
}

/* ===== Work ===== */
.work {
    padding: 120px 0;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.project-card {
    display: block;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--bg-card);
    overflow: hidden;
    transition: all var(--transition);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(74, 108, 247, 0.06);
}

.project-card-inner {
    padding: 32px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--accent-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--accent-light);
}

.project-icon svg {
    width: 24px;
    height: 24px;
}

.project-meta {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.project-tag {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    padding: 4px 10px;
    border-radius: 6px;
    background: var(--accent-dim);
    color: var(--accent-light);
    letter-spacing: 0.02em;
}

.project-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.project-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

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

/* ===== About ===== */
.about {
    padding: 120px 0;
    border-top: 1px solid var(--border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 80px;
}

.about-text p {
    color: var(--text-muted);
    margin-top: 16px;
    font-size: 1.05rem;
    line-height: 1.7;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.stat {
    padding: 28px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--bg-card);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--gradient-start), var(--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(--text-muted);
}

.tech-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.tech-item {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 10px 20px;
    border-radius: 100px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    transition: all var(--transition);
}

.tech-item:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: var(--accent-dim);
}

/* ===== Contact ===== */
.contact {
    padding: 120px 0;
    border-top: 1px solid var(--border);
}

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

.contact-sub {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.contact-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 0.95rem;
}

.footer-logo-img {
    width: 24px;
    height: 24px;
    border-radius: 5px;
    object-fit: cover;
}

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

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .project-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 640px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: 280px;
        background: var(--bg-raised);
        border-left: 1px solid var(--border);
        flex-direction: column;
        padding: 80px 24px 24px;
        gap: 4px;
        transform: translateX(100%);
        transition: transform var(--transition);
        z-index: 99;
    }

    .nav-links.open {
        transform: translateX(0);
    }

    .nav-links a {
        padding: 14px 16px;
        font-size: 1rem;
    }

    .nav-toggle {
        display: flex;
        z-index: 101;
    }

    .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);
    }

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

    .hero {
        padding: 100px 20px 60px;
    }

    .hero-logo {
        width: 40px;
        height: 40px;
        border-radius: 9px;
    }

    .hero-title {
        font-size: 2.4rem;
    }

    .hero-sub {
        font-size: 1.05rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .footer-inner {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }
}