/* 对称版式 · 大型峰会专题 */
:root {
  --bg: #f3f1ec;
  --stage: #ffffff;
  --ink: #1a1f2c;
  --mute: #6a7184;
  --line: #ddd7cb;
  --gold: #b8944d;
  --gold-deep: #8f6f35;
  --navy: #24304a;
  --navy-soft: #e8ebf2;
  --ok: #4f7d62;
  --shadow: 0 18px 40px rgba(36, 48, 74, 0.08);
  --radius: 4px;
  --font-display: "Georgia", "Songti SC", "SimSun", "Microsoft YaHei UI", serif;
  --font-body: "Segoe UI", "Microsoft YaHei UI", sans-serif;
  --font-mono: "Segoe UI", "Microsoft YaHei UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    linear-gradient(180deg, #ebe7df, var(--bg) 30%, #ece8e1);
  line-height: 1.7;
}
img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.25; margin: 0 0 0.55rem; font-weight: 600; }
p { margin: 0 0 0.85rem; }
.wrap { width: min(1080px, calc(100% - 2rem)); margin-inline: auto; }
.center { text-align: center; }

.summit > * { position: relative; z-index: 1; }

/* centered masthead — symmetrical flanks */
.mast {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1.25rem 0 0.5rem;
  border-bottom: 1px solid var(--line);
}
.mast .nav-l,
.mast .nav-r {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  font-size: 0.9rem;
}
.mast .nav-l { justify-content: flex-end; }
.mast .nav-r { justify-content: flex-start; }
.mast a { color: var(--mute); }
.mast a:hover, .mast a.on { color: var(--ink); }
.mast a.on { box-shadow: inset 0 -2px 0 var(--gold); }
.emblem {
  display: grid;
  justify-items: center;
  gap: 0.2rem;
  text-align: center;
  padding: 0 0.5rem;
}
.emblem .seal {
  width: 46px; height: 46px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--gold-deep);
  font-family: var(--font-display);
  font-weight: 700;
  background: radial-gradient(circle at 35% 30%, #fff, #f5efe3);
}
.emblem b { font-size: 1.05rem; letter-spacing: 0.08em; }
.emblem small {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--gold-deep);
  text-transform: uppercase;
}

/* HERO — keynote stage, fully centered */
.keynote {
  padding: 2.4rem 0 2.6rem;
  display: grid;
  justify-items: center;
  gap: 1.35rem;
  text-align: center;
}
.ribbon {
  display: inline-block;
  padding: 0.35rem 1rem;
  border: 1px solid var(--gold);
  color: var(--gold-deep);
  letter-spacing: 0.22em;
  font-size: 0.72rem;
  text-transform: uppercase;
}
.keynote h1 {
  font-size: clamp(2.1rem, 4.2vw, 3.3rem);
  max-width: 12ch;
  letter-spacing: 0.04em;
}
.lead {
  color: var(--mute);
  font-size: 1.05rem;
  max-width: 46ch;
  margin-inline: auto;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0.35rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 156px;
  padding: 0.8rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 700;
  white-space: nowrap;
  word-break: keep-all;
  writing-mode: horizontal-tb;
  border: 1px solid transparent;
  transition: transform 0.18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-gold {
  background: linear-gradient(180deg, #c9a35d, var(--gold-deep));
  color: #fff;
  box-shadow: 0 12px 26px rgba(143, 111, 53, 0.25);
}
.btn-line {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}
.req {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  max-width: 460px;
  width: 100%;
  margin-top: 0.4rem;
}
.req p {
  margin: 0;
  padding: 0.7rem 0.85rem;
  background: var(--stage);
  border: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--mute);
}
.req b {
  display: block;
  color: var(--ink);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.1rem;
}
.stage-frame {
  width: min(920px, 100%);
  border: 1px solid var(--line);
  background: var(--stage);
  box-shadow: var(--shadow);
  overflow: hidden;
  align-self: center;
}

/* section header — centered */
.sec { padding: 3rem 0; }
.sec-h {
  text-align: center;
  margin-bottom: 1.6rem;
  display: grid;
  justify-items: center;
  gap: 0.35rem;
}
.sec-h .label {
  letter-spacing: 0.2em;
  font-size: 0.72rem;
  color: var(--gold-deep);
  text-transform: uppercase;
}
.sec-h h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.1rem);
  margin: 0;
}
.sec-h p {
  margin: 0;
  color: var(--mute);
  max-width: 52ch;
}

/* download — symmetrical 2x2 pavilion cards */
.pavilions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  max-width: 920px;
  margin-inline: auto;
}
.pav {
  background: var(--stage);
  border: 1px solid var(--line);
  padding: 1.25rem 1.2rem 1.3rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.4rem;
  text-align: center;
}
.pav .hall {
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--gold-deep);
}
.pav .os { font-size: 1.25rem; margin: 0; font-family: var(--font-display); }
.pav .meta { margin: 0; color: var(--mute); font-size: 0.9rem; }
.pav .meta b { color: var(--ink); }
.pav .btn { width: 100%; margin-top: 0.45rem; }

/* features — centered five-column agenda strip */
.agenda {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--line);
  background: var(--stage);
  box-shadow: var(--shadow);
}
.slot {
  padding: 1.3rem 0.9rem 1.4rem;
  text-align: center;
  border-right: 1px solid var(--line);
}
.slot:last-child { border-right: 0; }
.slot .ico {
  width: 44px; height: 44px;
  margin: 0 auto 0.75rem;
  border: 1px solid var(--gold);
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--gold-deep);
  font-family: var(--font-display);
  font-weight: 700;
}
.slot h3 { font-size: 1rem; }
.slot p { margin: 0; color: var(--mute); font-size: 0.86rem; }

/* solution — mirrored two panels */
.forum {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  align-items: stretch;
}
.speech {
  background: var(--navy);
  color: #eef1f7;
  padding: 1.6rem 1.4rem;
  border: 1px solid var(--navy);
}
.speech .label { color: var(--gold); }
.speech h2 { color: #fff; font-size: 1.55rem; }
.speech p { color: rgba(238, 241, 247, 0.78); }
.points {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}
.points li {
  padding-left: 1.1rem;
  position: relative;
  font-size: 0.95rem;
}
.points li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.55rem;
  width: 7px; height: 7px;
  background: var(--gold);
}
.gallery {
  display: grid;
  grid-template-rows: 1.2fr auto;
  gap: 0.75rem;
}
.shot {
  border: 1px solid var(--line);
  background: #fff;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.shot-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* trust — centered podium */
.podium {
  text-align: center;
  padding: 2.2rem 1.2rem;
  background: var(--stage);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.podium .big {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.45rem);
  margin-bottom: 0.35rem;
}
.podium .big em {
  font-style: normal;
  color: var(--gold-deep);
}
.podium .sub { color: var(--mute); margin-bottom: 1.25rem; }
.brands {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
}
.brands span {
  padding: 0.45rem 1rem;
  border: 1px solid var(--line);
  font-size: 0.92rem;
  background: var(--navy-soft);
}

/* news + help — equal twin columns */
.twin {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}
.panel {
  background: var(--stage);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-h {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #faf8f4, #fff);
}
.panel-h h2 { font-size: 1.2rem; margin: 0; }
.panel-h a { color: var(--gold-deep); font-size: 0.88rem; font-weight: 700; }
.news {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}
.news:last-child { border-bottom: 0; }
.news time {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gold-deep);
}
.news h3 { font-size: 1rem; margin-bottom: 0.2rem; }
.news p { margin: 0; color: var(--mute); font-size: 0.88rem; }
.faq details {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}
.faq details:last-child { border-bottom: 0; }
.faq summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "◆ ";
  color: var(--gold);
  font-size: 0.75rem;
}
.faq p { color: var(--mute); margin: 0.5rem 0 0.1rem; font-size: 0.92rem; }

/* closing CTA — centered */
.closing {
  margin: 0.4rem 0 2.8rem;
  padding: 2rem 1.4rem;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(184, 148, 77, 0.08), transparent 55%),
    var(--stage);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: grid;
  justify-items: center;
  gap: 0.85rem;
}
.closing h2 {
  font-size: clamp(1.45rem, 2.5vw, 1.95rem);
  margin: 0;
}
.gains {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
  max-width: 42ch;
  text-align: left;
}
.gains li {
  color: var(--mute);
  padding-left: 1.1rem;
  position: relative;
  font-size: 0.95rem;
}
.gains li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--ok);
  font-weight: 800;
}

.foot {
  border-top: 1px solid var(--line);
  padding: 1.35rem 0 2rem;
  display: grid;
  justify-items: center;
  gap: 0.65rem;
  color: var(--mute);
  font-size: 0.88rem;
  text-align: center;
}
.foot nav { display: flex; gap: 1.1rem; }

.page-hero {
  padding: 2rem 0 1.2rem;
  display: grid;
  justify-items: center;
  gap: 1.2rem;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(1.85rem, 3.5vw, 2.6rem);
  max-width: 12ch;
}

@media (max-width: 980px) {
  .mast { grid-template-columns: 1fr; justify-items: center; }
  .mast .nav-l, .mast .nav-r { justify-content: center; }
  .forum, .twin, .pavilions { grid-template-columns: 1fr; }
  .agenda { grid-template-columns: 1fr 1fr; }
  .slot { border-bottom: 1px solid var(--line); }
  .slot:nth-child(even) { border-right: 0; }
}
@media (max-width: 640px) {
  .agenda, .req, .shot-row { grid-template-columns: 1fr; }
  .slot { border-right: 0 !important; }
  .actions .btn { flex: 1 1 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .btn:hover { transform: none; }
}

/* ===== Hero image hard rules ===== */
.keynote,
.page-hero { align-items: center; }
.stage-frame {
  align-self: center;
  height: auto;
  padding: 0;
  margin: 0;
}
.stage-frame img,
.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  margin: 0;
  padding: 0;
  min-height: 0;
  max-height: none;
  clip-path: none;
  transform: none;
}