/* ═══════════════════════════════════════
   ZO.XUE PORTFOLIO — Editorial Dark
   Font: Space Grotesk + DM Serif Display
   Aesthetic: Magazine editorial, grain overlay,
   asymmetric layout, warm amber accent
   ═══════════════════════════════════════ */

:root {
    --bg: #0c0b0f;
    --bg-elevated: #141318;
    --surface: #1a191f;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --text: #e8e6e3;
    --text-dim: #8a8690;
    --text-muted: #5a5662;
    --accent: #e8a849;
    --accent-dim: rgba(232, 168, 73, 0.15);
    --font-sans: 'Space Grotesk', system-ui, sans-serif;
    --font-serif: 'DM Serif Display', Georgia, serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

/* Grain overlay */
.grain {
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.035;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px;
}

.accent { color: var(--accent); }

/* ── Navigation ── */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 4%;
    background: rgba(12, 11, 15, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: color 0.3s;
}

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

.lang-switch {
    border: 1px solid var(--border-hover);
    padding: 0.2rem 0.6rem;
    border-radius: 3px;
    font-size: 0.78rem;
    transition: border-color 0.3s, color 0.3s;
}

.lang-switch:hover {
    border-color: var(--accent);
}

/* ── Hero ── */
.hero {
    min-height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 7rem 4% 3rem;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 15%;
    right: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(232, 168, 73, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-label {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.2rem;
    padding-left: 2rem;
    position: relative;
}

.hero-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 1.2rem;
    height: 1px;
    background: var(--accent);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.4rem, 5.5vw, 4.5rem);
    line-height: 1.1;
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 2rem;
}

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

.hero-meta {
    display: flex;
    gap: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.meta-label {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.meta-value {
    font-size: 0.95rem;
    color: var(--text-dim);
    font-weight: 500;
}

.meta-value.available {
    color: #4ade80;
}

/* ── Marquee ── */
.marquee-section {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    padding: 1rem 0;
}

.marquee {
    display: flex;
    width: max-content;
}

.marquee-track {
    display: flex;
    gap: 2rem;
    animation: scroll 30s linear infinite;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.marquee-track .sep {
    color: var(--accent);
    font-size: 0.5rem;
    vertical-align: middle;
}

@keyframes scroll {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* ── Section Labels ── */
.section-label {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    padding: 0 4%;
}

.label-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    letter-spacing: 0.05em;
}

.label-text {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* ── Projects ── */
.projects {
    padding: 4rem 0;
}

.project-list {
    display: flex;
    flex-direction: column;
}

.project {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 2rem;
    padding: 2.5rem 4%;
    border-top: 1px solid var(--border);
    cursor: default;
    transition: background 0.4s, border-color 0.4s;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease, background 0.4s;
}

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

.project:hover {
    background: var(--bg-elevated);
    border-color: var(--border-hover);
}

.project::after {
    content: attr(data-category);
    position: absolute;
    right: 4%;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    opacity: 0;
    transition: opacity 0.3s;
}

.project { position: relative; }

.project:hover::after { opacity: 1; }

.project-index {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    padding-top: 0.3rem;
}

.project-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.6rem;
    color: var(--text);
    transition: color 0.3s;
}

.project:hover .project-name { color: var(--accent); }

.project-desc {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.65;
    max-width: 600px;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-tags span {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 0.25rem 0.7rem;
    border-radius: 2px;
    letter-spacing: 0.02em;
}

/* ── About ── */
.about {
    padding: 4rem 0;
    border-top: 1px solid var(--border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding: 0 4%;
}

.about-text {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.about-text.visible {
    opacity: 1;
    transform: translateY(0);
}

.about-lead {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    line-height: 1.3;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.about-text p {
    color: var(--text-dim);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.about-capabilities {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.cap-group {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.cap-group.visible {
    opacity: 1;
    transform: translateY(0);
}

.cap-title {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.cap-group p {
    font-size: 0.92rem;
    color: var(--text-dim);
    line-height: 1.7;
}

/* ── Footer ── */
.footer {
    border-top: 1px solid var(--border);
    padding: 4rem 4% 2rem;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.footer-heading {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-label {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--text);
}

.footer-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
}

.contact-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.3s, background 0.3s;
    position: relative;
    cursor: pointer;
}

.contact-card:hover {
    border-color: var(--accent);
    background: var(--surface);
}

.contact-icon {
    font-size: 1.4rem;
    margin-bottom: 0.3rem;
}

.contact-type {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
}

.contact-value {
    font-size: 0.92rem;
    color: var(--text-dim);
    word-break: break-all;
}

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

/* WeChat QR popup */
.wechat-qr-popup {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    background: #fff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 50;
}

.wechat-qr-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: #fff;
}

.wechat-card:hover .wechat-qr-popup {
    opacity: 1;
    transform: translateX(-50%) scale(1);
    pointer-events: auto;
}

.wechat-qr-popup img {
    display: block;
    border-radius: 4px;
}

.footer-bottom {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero { padding: 6rem 5% 2rem; }
    .hero-title { font-size: clamp(1.8rem, 8vw, 2.8rem); }
    .hero-meta { flex-direction: column; gap: 1.5rem; }
    .nav-links { gap: 1.5rem; }
    .nav-links a { font-size: 0.75rem; }
    .project { grid-template-columns: 1fr; gap: 0; }
    .project-index { display: none; }
    .project::after { display: none; }
    .about-grid { grid-template-columns: 1fr; gap: 3rem; }
    .about-capabilities { grid-template-columns: 1fr; }
    .footer-inner { gap: 2rem; }
    .footer-email { font-size: 1.4rem; }
    .contact-grid { grid-template-columns: 1fr; }
    .wechat-qr-popup { left: 0; transform: translateX(0) scale(0.9); }
    .wechat-card:hover .wechat-qr-popup { transform: translateX(0) scale(1); }
    .wechat-qr-popup::after { left: 2rem; transform: none; }
    .section-label { padding: 0 5%; }
    .project { padding: 2rem 5%; }
}