/* ============================================================
 * loong.design — 极简作品集样式（参考 Lavernia & Cienfuegos 的
 * 图优先、大留白、稀疏排版与全幅案例呈现）
 * ============================================================ */

:root {
  --bg: #fafaf8;
  --ink: #161616;
  --muted: #8c8c84;
  --line: #e7e4dd;
  --accent: #161616;
  --maxw: 1320px;
  --gap: clamp(16px, 3vw, 40px);
  --pad: clamp(20px, 5vw, 72px);
  --font: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "微软雅黑", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.label {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px var(--pad);
  background: rgba(250, 250, 248, 0.86);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease;
}
.site-header.scrolled { border-color: var(--line); }

.wordmark { display: flex; align-items: baseline; gap: 10px; }
.wm-cn { font-size: 20px; font-weight: 600; letter-spacing: 0.04em; }
.wm-en { font-size: 11px; letter-spacing: 0.28em; color: var(--muted); }

.site-nav { display: flex; gap: clamp(18px, 3vw, 40px); }
.site-nav a {
  font-size: 14px;
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 4px;
}
.site-nav a span {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-left: 4px;
  text-transform: uppercase;
}
.site-nav a::after {
  content: "";
  position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: var(--ink);
  transition: width .3s ease;
}
.site-nav a:hover::after,
.site-nav a.active::after { width: 100%; }

/* ---------- Layout containers ---------- */
.app { display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }
.section { padding: clamp(60px, 9vw, 130px) 0; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: clamp(28px, 5vw, 56px);
  gap: 20px; flex-wrap: wrap;
}
.section-title { font-size: clamp(22px, 3.4vw, 34px); font-weight: 500; letter-spacing: .01em; margin: 0; }
.section-link { font-size: 13px; color: var(--muted); letter-spacing: .04em; }
.section-link:hover { color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--gap);
  align-items: center;
  padding: clamp(48px, 8vw, 110px) var(--pad) clamp(40px, 6vw, 80px);
  max-width: var(--maxw);
  margin: 0 auto;
}
.hero-copy { max-width: 520px; }
.hero h1 {
  font-size: clamp(34px, 6vw, 76px);
  line-height: 1.02;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 18px 0 22px;
}
.hero .role { font-size: 15px; letter-spacing: .04em; color: var(--muted); }
.hero .tagline { font-size: clamp(16px, 2vw, 20px); line-height: 1.5; margin: 0; color: #2a2a2a; }
.hero-media { position: relative; overflow: hidden; aspect-ratio: 16 / 9; background: #eee; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ---------- Works grid ---------- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
}
.work-card { display: block; position: relative; }
.work-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16 / 9; background: #eee;
}
.work-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transform: scale(1.001);
  transition: transform .7s cubic-bezier(.2,.7,.2,1), filter .7s ease;
  filter: saturate(1);
}
.work-card:hover .work-thumb img { transform: scale(1.05); }
.work-meta {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-top: 14px; gap: 12px;
}
.work-title { font-size: 17px; font-weight: 500; letter-spacing: .01em; }
.work-sub { font-size: 12px; color: var(--muted); letter-spacing: .04em; margin-top: 2px; }
.work-year { font-size: 12px; color: var(--muted); letter-spacing: .1em; white-space: nowrap; }
.work-card .reveal-line {
  height: 1px; background: var(--line); margin-top: 14px;
  transform: scaleX(0); transform-origin: left;
  transition: transform .5s ease;
}
.work-card:hover .reveal-line { transform: scaleX(1); background: var(--ink); }

/* ---------- Project detail ---------- */
.project-hero { padding: clamp(24px,4vw,48px) var(--pad) 0; max-width: var(--maxw); margin: 0 auto; }
.project-hero img { width: 100%; display: block; aspect-ratio: 16/9; object-fit: cover; background:#eee; }
.project-head {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(28px,4vw,48px) var(--pad);
  display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--gap);
}
.project-head h1 { font-size: clamp(26px,4vw,46px); font-weight: 500; margin: 0 0 10px; letter-spacing: -.01em; }
.project-head .p-en { color: var(--muted); font-size: 13px; letter-spacing: .2em; text-transform: uppercase; }
.project-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 24px; align-content: start; }
.fact .label { display:block; }
.fact .val { font-size: 15px; }
.project-summary { margin-top: 14px; color: #2a2a2a; font-size: 16px; line-height: 1.6; }

.sequence { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad) clamp(40px,6vw,80px); }
.sequence figure { margin: 0 0 clamp(20px,3vw,40px); }
.sequence img { width: 100%; display: block; background: #eee; }

.next-project {
  border-top: 1px solid var(--line);
  padding: clamp(40px,6vw,80px) var(--pad);
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.next-project .np-label { font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }
.next-project .np-title { font-size: clamp(22px,3vw,34px); font-weight: 500; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: var(--gap); align-items: start; }
.about-portrait { aspect-ratio: 4/5; background:#eee; overflow:hidden; }
.about-portrait img { width:100%; height:100%; object-fit: cover; display:block; }
.about-body p { font-size: clamp(16px,1.8vw,19px); line-height: 1.7; margin: 0 0 18px; color:#222; }
.services { list-style: none; padding: 0; margin: 28px 0 0; border-top: 1px solid var(--line); }
.services li { padding: 14px 0; border-bottom: 1px solid var(--line); display:flex; justify-content: space-between; font-size: 15px; }
.services li span { color: var(--muted); font-size: 12px; letter-spacing:.1em; }

/* ---------- Contact ---------- */
.contact-wrap { max-width: 900px; }
.contact-wrap h1 { font-size: clamp(30px,6vw,64px); font-weight: 500; letter-spacing: -.01em; margin: 0 0 30px; line-height: 1.05; }
.contact-rows { border-top: 1px solid var(--line); }
.contact-row { display: grid; grid-template-columns: 160px 1fr; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--line); align-items: center; }
.contact-row .label { margin: 0; }
.contact-row .val { font-size: clamp(16px,2vw,22px); }
.contact-row .val a:hover { text-decoration: underline; }

/* ---------- Lookbook ---------- */
.lookbook { max-width: 1100px; margin: 0 auto; padding: 0 var(--pad) clamp(40px,6vw,80px); }
.lookbook figure { margin: 0 0 18px; }
.lookbook img { width: 100%; display: block; background:#eee; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: clamp(40px,6vw,70px) var(--pad) 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  max-width: var(--maxw); margin: 0 auto;
}
.site-footer p { margin: 4px 0; font-size: 15px; }
.site-footer a:hover { text-decoration: underline; }
.ft-bottom {
  grid-column: 1 / -1;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line);
  font-size: 12px; color: var(--muted); letter-spacing: .04em;
}
.icp { color: var(--muted); text-decoration: none; transition: color .2s ease; }
.icp:hover { color: var(--ink); text-decoration: underline; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .works-grid { grid-template-columns: 1fr; }
  .project-head { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .about-portrait { max-width: 360px; }
  .site-footer { grid-template-columns: 1fr 1fr; }
  .contact-row { grid-template-columns: 110px 1fr; }
}
@media (max-width: 560px) {
  .site-nav a span { display: none; }
  .site-footer { grid-template-columns: 1fr; }
  .project-facts { grid-template-columns: 1fr; }
  .wm-cn { font-size: 16px; }
  .wm-en { display: none; }
}