:root {
  --paper: #fafafa;
  --ink: #0a0a0a;
  --ink-soft: #2a2a2a;
  --gray: #9a9a9a;
  --line: #e2e2e2;
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Playfair Display', 'Noto Sans SC', Georgia, serif;
}

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

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

body {
  font-family: var(--font-cn);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--paper);
  letter-spacing: 0.02em;
}

a { color: inherit; }

::selection { background: var(--ink); color: var(--paper); }

/* ===== Masthead ===== */
.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 40px;
  border-bottom: 1px solid var(--ink);
  background: var(--paper);
}
.mh-back {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.mh-back:hover { color: var(--gray); }
.mh-brand {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--ink);
  white-space: nowrap;
}
.mh-center {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 2px;
  font-weight: 500;
  white-space: nowrap;
}
.mh-right {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
  white-space: nowrap;
}
.masthead nav { display: flex; gap: 26px; }
.masthead nav a {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
  text-decoration: none;
  transition: color 0.25s ease;
}
.masthead nav a:hover { color: var(--ink); }

@media (max-width: 900px) {
  .masthead { padding: 14px 20px; }
  .masthead .mh-center { display: none; }
}

/* ===== Hero (home) ===== */
.hero {
  padding: 120px 40px 90px;
  max-width: 1280px;
  margin: 0 auto;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 30px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -1px;
  margin-bottom: 34px;
}
.hero h1 em { font-style: italic; font-weight: 400; }
.hero-note {
  max-width: 460px;
  font-size: 15px;
  color: var(--ink-soft);
  border-left: 1px solid var(--ink);
  padding-left: 24px;
}
@media (max-width: 768px) { .hero { padding: 80px 20px 56px; } }

/* ===== Home index cards ===== */
.index-list {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px;
}
.index-card {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 44px 8px;
  border-top: 1px solid var(--ink);
  text-decoration: none;
  transition: background 0.3s ease, color 0.3s ease, padding 0.3s ease;
}
.index-card:last-child { border-bottom: 1px solid var(--ink); }
.index-card:hover { background: var(--ink); color: var(--paper); padding-left: 24px; padding-right: 24px; }
.ic-no {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--gray);
  min-width: 44px;
  transition: color 0.3s ease;
}
.index-card:hover .ic-no { color: var(--paper); }
.ic-body { flex: 1; }
.ic-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.5px;
}
.ic-en {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gray);
  transition: color 0.3s ease;
}
.index-card:hover .ic-en { color: var(--paper); }
.ic-desc {
  font-size: 13px;
  color: var(--gray);
  text-align: right;
  white-space: nowrap;
  transition: color 0.3s ease;
}
.index-card:hover .ic-desc { color: var(--paper); }
.ic-arrow {
  font-size: 22px;
  color: var(--gray);
  transition: transform 0.3s ease, color 0.3s ease;
}
.index-card:hover .ic-arrow { transform: translate(6px, -6px); color: var(--paper); }
@media (max-width: 768px) {
  .index-list { padding: 0 20px; }
  .index-card { flex-wrap: wrap; gap: 12px; }
  .ic-desc { text-align: left; }
}

/* ===== Sub-page module ===== */
.module { max-width: 1280px; margin: 0 auto; padding: 70px 40px; }
.module-head {
  border-top: 1px solid var(--ink);
  padding: 26px 0 40px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 28px;
}
.module-no {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 2px;
}
.module-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 500;
  letter-spacing: 0.5px;
  line-height: 1.1;
}
.module-en {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gray);
  white-space: nowrap;
  align-self: center;
}
@media (max-width: 768px) {
  .module { padding: 56px 20px; }
  .module-head { grid-template-columns: auto 1fr; }
  .module-en { display: none; }
}

/* ===== list rows (文案 / 账号) ===== */
.rows { border-top: 1px solid var(--line); }
.row {
  display: flex;
  align-items: baseline;
  gap: 22px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.row-index {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--gray);
  min-width: 30px;
}
.row-main { flex: 1; min-width: 0; }
.row-title { font-size: 16px; font-weight: 400; letter-spacing: 0.5px; }
.row-tag {
  margin-top: 2px;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
}
.row-links { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
.chip {
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 12px;
  border: 1px solid var(--line);
  transition: border-color 0.25s, background 0.25s;
  white-space: nowrap;
}
.chip:hover { border-color: var(--ink); background: var(--ink); color: var(--paper); }
.chip .arr { opacity: 0.5; margin-left: 4px; }
@media (max-width: 768px) {
  .row { flex-wrap: wrap; gap: 10px; }
  .row-links { justify-content: flex-start; width: 100%; }
}

/* ===== video grid ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 64px 56px;
}
@media (max-width: 768px) { .video-grid { grid-template-columns: 1fr; gap: 48px; } }
.video-item { display: flex; flex-direction: column; }
.video-media {
  position: relative;
  aspect-ratio: 16 / 10;
  background: #e8e8e8;
  overflow: hidden;
  margin-bottom: 18px;
}
.video-media video {
  width: 100%; height: 100%; object-fit: cover; display: block;
  filter: grayscale(0.15) contrast(1.02);
}
.video-ph {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  color: #b5b5b5;
}
.video-ph .glyph { font-size: 40px; font-weight: 300; line-height: 1; }
.video-ph .hint { font-size: 11px; letter-spacing: 3px; text-transform: uppercase; }
.video-meta {
  display: flex; align-items: baseline; gap: 18px;
  border-top: 1px solid var(--line); padding-top: 14px;
}
.video-index { font-family: var(--font-display); font-size: 14px; color: var(--gray); }
.video-title { font-family: var(--font-display); font-size: 20px; font-weight: 500; }
.video-cat { margin-left: auto; font-size: 11px; letter-spacing: 2px; text-transform: uppercase; color: var(--gray); white-space: nowrap; }

/* ===== photo PDF ===== */
.photo-wrap {
  border-top: 1px solid var(--line);
  padding-top: 44px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.photo-link {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.5vw, 40px);
  font-weight: 500;
  text-decoration: none;
  padding: 8px 0;
  border-bottom: 1px solid var(--ink);
  transition: color 0.25s, border-color 0.25s;
}
.photo-link:hover { color: var(--gray); border-color: var(--gray); }
.photo-link .arr { font-size: 0.6em; }
.photo-note {
  margin-top: 20px;
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
}

/* ===== Footer ===== */
.footer {
  max-width: 1280px;
  margin: 60px auto 0;
  padding: 40px;
  border-top: 1px solid var(--ink);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
}
.footer a { text-decoration: none; color: var(--gray); }
.footer a:hover { color: var(--ink); }
@media (max-width: 768px) {
  .footer { padding: 30px 20px; flex-direction: column; gap: 10px; text-align: center; }
}