/* =============================================================
 * architecture.css — 空间实验室 / SPACE LAB
 * 建筑编辑风 · 暖白极简专题（独立 arch- 命名空间，不影响主站暗色模块）
 * 仅在 architecture.html 通过 body.arch-page 生效
 * ============================================================= */

.arch-page {
  --a-bg: #F5F4F0;
  --a-bg2: #EFEDE6;
  --a-card: #FFFFFF;
  --a-ink: #202321;
  --a-ink2: #656A63;
  --a-ink3: #979B92;
  --a-line: #E2E1DC;
  --a-accent: #717D6B;
  --a-accent-d: #55604F;
  --a-dark: #202522;
  --a-dark-2: #2A302B;
  --a-dark-ink: #ECEAE2;
  --a-dark-ink2: #A5A99F;
  background: var(--a-bg);
  color: var(--a-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.arch-page ::selection { background: rgba(113, 125, 107, .22); }

.arch-wrap {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  box-sizing: border-box;
}

/* ---------- 顶部导航：亮色页适配（位于深色 hero 上时透明/白字，滚动后浅底/深字） ---------- */
.arch-page .nav {
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .35s ease, border-color .35s ease;
}
.arch-page .nav.scrolled {
  background: rgba(245, 244, 240, .88);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--a-line);
}
.arch-page .nav-logo,
.arch-page .nav-link { color: var(--a-dark-ink); }
.arch-page .nav.scrolled .nav-logo,
.arch-page .nav.scrolled .nav-link { color: var(--a-ink); }
.arch-page .nav-link { position: relative; }
.arch-page .nav-link::after { background: var(--a-accent); }
.arch-page .nav-link.active { color: #A9B49D; }
.arch-page .nav-link:hover { color: #fff; }
.arch-page .nav.scrolled .nav-link.active { color: var(--a-accent-d); }
.arch-page .nav.scrolled .nav-link:hover { color: var(--a-accent-d); }
.arch-page .nav.scrolled .nav-link::after { background: var(--a-accent-d); }
.arch-page .nav-toggle span { background: var(--a-dark-ink); }
.arch-page .nav.scrolled .nav-toggle span { background: var(--a-ink); }
.arch-page .mobile-menu { background: rgba(245, 244, 240, .98); border-top: 1px solid var(--a-line); }
.arch-page .mobile-menu a { color: var(--a-ink); border-bottom: 1px solid var(--a-line); }
.arch-page .mobile-menu .mm-en { color: var(--a-ink3); }

/* ---------- 页脚：亮色适配 ---------- */
.arch-page .footer {
  background: var(--a-dark);
  color: var(--a-dark-ink2);
  border-top: 1px solid rgba(255, 255, 255, .08);
}
.arch-page .footer-brand { color: var(--a-dark-ink); }
.arch-page .footer-links a { color: var(--a-dark-ink2); }
.arch-page .footer-links a:hover { color: #fff; }
.arch-page .footer-top { color: var(--a-dark-ink2); }
.arch-page .footer-copy { color: var(--a-dark-ink2); }

/* ---------- HERO（深色） ---------- */
.arch-hero {
  position: relative;
  background: var(--a-dark);
  color: var(--a-dark-ink);
  padding: 148px 0 84px;
  overflow: hidden;
}
.arch-hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(900px 520px at 82% -8%, rgba(113, 125, 107, .20), transparent 62%),
    linear-gradient(180deg, #1C211D 0%, var(--a-dark) 100%);
  pointer-events: none;
}
.arch-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
}
.arch-kicker {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .22em;
  color: #A9B49D;
  margin: 0 0 26px;
  display: flex; align-items: center; gap: 12px;
}
.arch-kicker::before { content: ""; width: 30px; height: 1px; background: #A9B49D; display: inline-block; }
.arch-h1 {
  font-family: "Arial Black", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(52px, 9vw, 104px);
  line-height: .98;
  margin: 0 0 18px;
  letter-spacing: .01em;
  color: #fff;
}
.arch-en {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px; letter-spacing: .3em;
  color: var(--a-dark-ink2);
  margin: 0 0 26px;
}
.arch-sub {
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  color: var(--a-dark-ink);
  margin: 0 0 18px;
  letter-spacing: .02em;
}
.arch-intro {
  font-size: 15px; line-height: 1.95;
  color: var(--a-dark-ink2);
  max-width: 30em;
  margin: 0 0 30px;
}
.arch-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 38px; }
.arch-chip {
  font-size: 12.5px; letter-spacing: .04em;
  color: var(--a-dark-ink);
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 2px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, .04);
}
.arch-hero-media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 2px;
  border: 1px solid rgba(255, 255, 255, .12);
}
.arch-hero-media img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
  transform: scale(1.02);
}
.arch-hero-media figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 11px; letter-spacing: .08em;
  color: rgba(255, 255, 255, .82);
  padding: 26px 16px 12px;
  background: linear-gradient(180deg, transparent, rgba(20, 24, 20, .82));
}
/* 按钮（深色区） */
.arch-btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; letter-spacing: .04em;
  padding: 13px 26px;
  border-radius: 2px;
  text-decoration: none;
  transition: all .25s ease;
  cursor: pointer;
  border: 1px solid #fff;
}
.arch-btn-solid { background: #fff; color: var(--a-dark); }
.arch-btn-solid:hover { background: #E3E0D6; }
.arch-btn-ghost { background: transparent; color: var(--a-dark-ink); border-color: rgba(255, 255, 255, .32); }
.arch-btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .06); }
/* 浅色区按钮 */
.arch-btn-dark { background: var(--a-dark); color: #fff; border-color: var(--a-dark); }
.arch-btn-dark:hover { background: var(--a-accent-d); border-color: var(--a-accent-d); }
.arch-btn-line { background: transparent; color: var(--a-ink); border-color: var(--a-ink); }
.arch-btn-line:hover { background: var(--a-ink); color: var(--a-bg); }

/* ---------- 内部锚点导航（sticky） ---------- */
.arch-subnav {
  position: sticky; top: 68px; z-index: 40;
  background: rgba(245, 244, 240, .92);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--a-line);
}
.arch-subnav-in {
  display: flex; align-items: center; gap: 6px;
  overflow-x: auto; scrollbar-width: none;
}
.arch-subnav-in::-webkit-scrollbar { display: none; }
.arch-subnav a {
  flex: 0 0 auto;
  font-size: 13.5px; letter-spacing: .03em;
  color: var(--a-ink2);
  text-decoration: none;
  padding: 16px 16px 14px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
  white-space: nowrap;
}
.arch-subnav a span {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 10px; letter-spacing: .14em;
  color: var(--a-ink3); margin-left: 6px;
}
.arch-subnav a.active { color: var(--a-ink); border-bottom-color: var(--a-accent); }
.arch-subnav a:hover { color: var(--a-ink); }

/* ---------- 通用章节 ---------- */
.arch-sec { padding: 92px 0; scroll-margin-top: 116px; }
.arch-sec + .arch-sec { border-top: 1px solid var(--a-line); }
.arch-sec-head { margin-bottom: 52px; }
.ash-eyebrow {
  display: flex; align-items: center; gap: 14px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .24em; color: var(--a-accent-d);
  margin-bottom: 18px;
}
.ash-eyebrow b { font-weight: 700; }
.ash-eyebrow::after { content: ""; flex: 1; height: 1px; background: var(--a-line); }
.ash-title {
  font-family: "Arial Black", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.12; margin: 0 0 16px; color: var(--a-ink);
}
.ash-desc { font-size: 15px; line-height: 1.9; color: var(--a-ink2); max-width: 46em; margin: 0; }

/* ---------- 概览：编号索引 ---------- */
.arch-index { border-top: 1px solid var(--a-line); }
.arch-index-row {
  display: grid;
  grid-template-columns: 64px 130px 1fr auto 26px;
  align-items: center; gap: 24px;
  padding: 30px 8px;
  border-bottom: 1px solid var(--a-line);
  text-decoration: none; color: var(--a-ink);
  transition: background .25s, padding .25s;
}
.arch-index-row:hover { background: var(--a-card); padding-left: 16px; padding-right: 16px; }
.ix-no { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 14px; color: var(--a-accent-d); }
.ix-type { font-size: 13px; color: var(--a-ink2); letter-spacing: .02em; }
.ix-main h3 { margin: 0 0 6px; font-size: 22px; font-weight: 700; }
.ix-main p { margin: 0; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11.5px; letter-spacing: .14em; color: var(--a-ink3); }
.ix-status { font-size: 12px; color: var(--a-ink2); border: 1px solid var(--a-line); padding: 6px 12px; border-radius: 2px; }
.ix-arrow { font-size: 20px; color: var(--a-ink3); transition: transform .25s, color .25s; }
.arch-index-row:hover .ix-arrow { transform: translateX(5px); color: var(--a-accent-d); }

/* ---------- 项目 Feature（非对称） ---------- */
.arch-feature {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 56px;
  align-items: start;
}
.arch-f-media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 2px;
  background: var(--a-bg2);
  border: 1px solid var(--a-line);
}
.arch-f-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.arch-f-body { min-width: 0; }
.arch-f-tagrow { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.arch-f-type {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .2em; color: var(--a-accent-d);
  margin: 0 0 16px;
}
.arch-f-status {
  font-size: 11.5px; color: var(--a-ink2);
  border: 1px solid var(--a-line); border-radius: 2px;
  padding: 5px 11px; letter-spacing: .04em;
}
.arch-f-title {
  font-family: "Arial Black", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(28px, 3.6vw, 40px); line-height: 1.1; margin: 0 0 6px;
}
.arch-f-en {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .22em; color: var(--a-ink3);
  margin: 0 0 26px;
}
.arch-f-block { padding: 20px 0; border-top: 1px solid var(--a-line); }
.arch-f-block:last-of-type { border-bottom: 1px solid var(--a-line); }
.arch-f-label {
  font-size: 12px; letter-spacing: .16em; color: var(--a-accent-d);
  font-weight: 600; margin: 0 0 10px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
}
.arch-f-block p { margin: 0; font-size: 14.5px; line-height: 1.9; color: var(--a-ink2); }
.arch-f-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 30px; }
.arch-f-tag {
  font-size: 12px; color: var(--a-ink2);
  background: var(--a-card); border: 1px solid var(--a-line);
  border-radius: 2px; padding: 6px 12px;
}

/* ---------- 设计与成本专题 ---------- */
.arch-cost-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--a-line);
  border: 1px solid var(--a-line); border-radius: 2px;
  margin-top: 56px;
}
.arch-cost-item { background: var(--a-bg); padding: 32px 30px; }
.arch-cost-item .aci-no { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; color: var(--a-accent-d); letter-spacing: .1em; }
.arch-cost-item h4 { margin: 12px 0 10px; font-size: 18px; }
.arch-cost-item p { margin: 0; font-size: 14px; line-height: 1.85; color: var(--a-ink2); }

/* ---------- 关于 ---------- */
.arch-about { background: var(--a-bg2); }
.arch-about-grid { display: grid; grid-template-columns: 7fr 5fr; gap: 56px; }
.arch-about p { font-size: 15px; line-height: 2; color: var(--a-ink2); margin: 0 0 18px; }
.arch-side { display: flex; flex-direction: column; gap: 20px; }
.arch-side-card { background: var(--a-card); border: 1px solid var(--a-line); border-radius: 2px; padding: 24px; }
.arch-side-card h4 { margin: 0 0 14px; font-size: 13px; letter-spacing: .16em; font-family: ui-monospace, Menlo, Consolas, monospace; color: var(--a-accent-d); }
.arch-side-card .arch-tools { display: flex; flex-wrap: wrap; gap: 8px; }
.arch-status-line { font-size: 13px; color: var(--a-ink2); display: flex; align-items: center; gap: 10px; }
.arch-status-line::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--a-accent); }
.arch-truth-box {
  margin-top: 8px;
  border: 1px solid #D8D4C8;
  border-left: 3px solid var(--a-accent);
  background: rgba(255, 255, 255, .6);
  border-radius: 2px;
  padding: 20px 22px;
  font-size: 13px; line-height: 1.85; color: var(--a-ink2);
}
.arch-truth-box b { color: var(--a-ink); }

/* =============================================================
 * 详情全屏视图（hash 路由 #arch-detail-<id>）
 * ============================================================= */
.arch-detail {
  position: fixed; inset: 0; z-index: 120;
  background: var(--a-bg);
  overflow-y: auto;
  display: none;
  opacity: 0;
  transition: opacity .3s ease;
}
.arch-detail.open { display: block; opacity: 1; }
.arch-d-topbar {
  position: sticky; top: 0; z-index: 5;
  background: rgba(245, 244, 240, .92);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--a-line);
}
.arch-d-topbar-in {
  max-width: 1000px; margin: 0 auto; padding: 0 28px;
  height: 62px; display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.arch-d-back {
  appearance: none; background: none; border: 0; cursor: pointer;
  font-size: 14px; color: var(--a-ink);
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 0;
}
.arch-d-back:hover { color: var(--a-accent-d); }
.arch-d-topmeta { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px; letter-spacing: .14em; color: var(--a-ink3); }
.arch-d-close {
  appearance: none; background: none; border: 1px solid var(--a-line);
  width: 38px; height: 38px; border-radius: 2px; cursor: pointer;
  font-size: 19px; line-height: 1; color: var(--a-ink);
  display: inline-flex; align-items: center; justify-content: center;
}
.arch-d-close:hover { background: var(--a-dark); color: #fff; border-color: var(--a-dark); }
.arch-d-inner { max-width: 1000px; margin: 0 auto; padding: 0 28px 90px; }

.arch-d-cover { margin: 36px 0 40px; }
.arch-d-cover-img { aspect-ratio: 16 / 9; overflow: hidden; border-radius: 2px; border: 1px solid var(--a-line); background: var(--a-bg2); }
.arch-d-cover-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.arch-d-cap { font-size: 12px; color: var(--a-ink3); margin-top: 10px; }
.arch-d-type { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; letter-spacing: .2em; color: var(--a-accent-d); margin: 0 0 14px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.arch-d-status { border: 1px solid var(--a-line); border-radius: 2px; padding: 4px 10px; letter-spacing: .04em; color: var(--a-ink2); }
.arch-d-title { font-family: "Arial Black", "Helvetica Neue", Arial, sans-serif; font-size: clamp(30px, 5vw, 50px); line-height: 1.08; margin: 0 0 8px; }
.arch-d-en { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; letter-spacing: .24em; color: var(--a-ink3); margin: 0 0 30px; }

.arch-d-sec { padding: 38px 0; border-top: 1px solid var(--a-line); }
.arch-ds-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 22px; }
.arch-ds-no { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; color: var(--a-accent-d); }
.arch-ds-title { font-size: 22px; font-weight: 700; margin: 0; }
.arch-ds-en { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px; letter-spacing: .16em; color: var(--a-ink3); margin-left: auto; }
.arch-d-list { list-style: none; margin: 0; padding: 0; }
.arch-d-list li {
  position: relative; padding: 12px 0 12px 26px;
  font-size: 15px; line-height: 1.9; color: var(--a-ink2);
  border-bottom: 1px dashed var(--a-line);
}
.arch-d-list li:last-child { border-bottom: 0; }
.arch-d-list li::before {
  content: ""; position: absolute; left: 2px; top: 23px;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--a-accent);
}
.arch-d-list li b { color: var(--a-ink); font-weight: 600; }

/* 方案对比（项目一） */
.arch-plan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.arch-plan { border: 1px solid var(--a-line); border-radius: 2px; background: var(--a-card); overflow: hidden; }
.arch-plan-media { aspect-ratio: 3 / 2; overflow: hidden; cursor: zoom-in; position: relative; background: var(--a-bg2); }
.arch-plan-media img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s ease; }
.arch-plan-media:hover img { transform: scale(1.04); }
.arch-plan-media::after { content: "⤢"; position: absolute; right: 10px; bottom: 8px; font-size: 14px; color: #fff; text-shadow: 0 1px 4px rgba(0,0,0,.5); }
.arch-plan-pad { padding: 22px; }
.arch-plan-name { margin: 0 0 2px; font-size: 18px; font-weight: 700; }
.arch-plan-sub { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px; letter-spacing: .16em; color: var(--a-accent-d); margin: 0 0 14px; }
.arch-plan-cap { font-size: 12.5px; color: var(--a-ink3); line-height: 1.7; margin: 0 0 14px; }
.arch-plan-points { list-style: none; margin: 0 0 16px; padding: 0; }
.arch-plan-points li { font-size: 13.5px; line-height: 1.7; color: var(--a-ink2); padding: 5px 0 5px 16px; position: relative; }
.arch-plan-points li::before { content: "—"; position: absolute; left: 0; color: var(--a-ink3); }
.arch-plan-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; border-top: 1px solid var(--a-line); padding-top: 14px; }
.arch-pc h5 { margin: 0 0 6px; font-size: 12px; letter-spacing: .08em; }
.arch-pc.pros h5 { color: var(--a-accent-d); }
.arch-pc.cons h5 { color: #9A6A52; }
.arch-pc ul { list-style: none; margin: 0; padding: 0; }
.arch-pc li { font-size: 12.5px; line-height: 1.6; color: var(--a-ink2); padding: 3px 0 3px 13px; position: relative; }
.arch-pc.pros li::before { content: "＋"; position: absolute; left: 0; color: var(--a-accent-d); }
.arch-pc.cons li::before { content: "－"; position: absolute; left: 0; color: #9A6A52; }

/* 改造前后（项目二） */
.arch-ba { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.arch-ba-item { border: 1px solid var(--a-line); border-radius: 2px; overflow: hidden; background: var(--a-card); }
.arch-ba-media { aspect-ratio: 3 / 2; overflow: hidden; cursor: zoom-in; background: var(--a-bg2); }
.arch-ba-media img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s ease; }
.arch-ba-media:hover img { transform: scale(1.04); }
.arch-ba-pad { padding: 22px; }
.arch-ba-tag { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px; letter-spacing: .18em; margin: 0 0 10px; }
.arch-ba-before .arch-ba-tag { color: #8A7A66; }
.arch-ba-after .arch-ba-tag { color: var(--a-accent-d); }
.arch-ba-pad ul { list-style: none; margin: 0; padding: 0; }
.arch-ba-pad li { font-size: 13.5px; line-height: 1.7; color: var(--a-ink2); padding: 5px 0 5px 16px; position: relative; }
.arch-ba-pad li::before { content: "—"; position: absolute; left: 0; color: var(--a-ink3); }

/* 三档预算（项目三） */
.arch-tier-tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 26px; }
.arch-tier-tab {
  appearance: none; cursor: pointer;
  border: 1px solid var(--a-line); background: var(--a-card);
  border-radius: 2px; padding: 12px 22px;
  font-size: 14px; color: var(--a-ink2);
  display: flex; flex-direction: column; align-items: flex-start; gap: 3px;
  transition: all .2s; min-width: 132px;
}
.arch-tier-tab span { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 10px; letter-spacing: .14em; color: var(--a-ink3); }
.arch-tier-tab:hover { border-color: var(--a-accent); }
.arch-tier-tab.active { background: var(--a-dark); border-color: var(--a-dark); color: #fff; }
.arch-tier-tab.active span { color: var(--a-dark-ink2); }
.arch-tier-panel { display: none; }
.arch-tier-panel.active { display: block; animation: archFade .35s ease; }
@keyframes archFade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.arch-tier-top { display: grid; grid-template-columns: 1.15fr .85fr; gap: 36px; align-items: start; margin-bottom: 30px; }
.arch-tier-media { aspect-ratio: 4 / 3; overflow: hidden; border-radius: 2px; border: 1px solid var(--a-line); background: var(--a-bg2); }
.arch-tier-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.arch-tier-desc { font-size: 15px; line-height: 1.9; color: var(--a-ink2); margin: 0 0 18px; }
.arch-tier-rows { border-top: 1px solid var(--a-line); }
.arch-tier-row { display: grid; grid-template-columns: 96px 1fr; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--a-line); }
.arch-tier-label { font-size: 12px; letter-spacing: .08em; color: var(--a-accent-d); font-weight: 600; padding-top: 2px; }
.arch-tier-value { font-size: 14px; line-height: 1.75; color: var(--a-ink2); }
.arch-tier-risk {
  border: 1px solid #E2D6C8; background: #FBF7F0; border-radius: 2px;
  padding: 14px 18px; font-size: 13px; line-height: 1.8; color: #7A6248;
  margin-top: 16px;
}
.arch-tier-risk b { color: #8A5A3A; }

/* 预算分配堆叠条（纯 CSS，概念性比例模型） */
.arch-budget {
  border: 1px solid var(--a-line); border-radius: 2px;
  background: var(--a-card); padding: 24px 24px 26px;
}
.arch-budget-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.arch-budget-head h5 { margin: 0; font-size: 15px; }
.arch-budget-head span { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px; letter-spacing: .1em; color: var(--a-ink3); }
.arch-budget-bar { display: flex; height: 34px; border-radius: 2px; overflow: hidden; border: 1px solid var(--a-line); }
.arch-budget-seg { position: relative; transition: opacity .2s; cursor: default; }
.arch-budget-seg:hover { opacity: .82; }
.arch-budget-seg.big { display: flex; align-items: center; justify-content: center; }
.arch-budget-seg.big em { font-style: normal; font-size: 11px; color: rgba(255,255,255,.92); font-weight: 600; }
.arch-budget-legend { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px 22px; margin-top: 18px; }
.arch-legend-item { display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--a-ink2); }
.arch-legend-dot { width: 11px; height: 11px; border-radius: 2px; flex: 0 0 auto; }
.arch-legend-item b { margin-left: auto; color: var(--a-ink); font-weight: 600; font-family: ui-monospace, Menlo, Consolas, monospace; }
.arch-budget-note { font-size: 11.5px; color: var(--a-ink3); line-height: 1.7; margin: 14px 0 0; }

/* 详情底部真实性声明 */
.arch-d-foot {
  margin-top: 38px; border: 1px solid #D8D4C8; border-left: 3px solid var(--a-accent);
  background: rgba(255,255,255,.6); border-radius: 2px;
  padding: 18px 22px; font-size: 12.5px; line-height: 1.85; color: var(--a-ink2);
}
.arch-d-foot b { color: var(--a-ink); }

/* 上一个 / 下一个项目（详情内） */
.arch-d-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 40px; }
.arch-d-pager a {
  border: 1px solid var(--a-line); border-radius: 2px; padding: 18px 20px;
  text-decoration: none; color: var(--a-ink); background: var(--a-card);
  transition: border-color .2s, transform .2s;
}
.arch-d-pager a:hover { border-color: var(--a-accent); transform: translateY(-2px); }
.arch-d-pager .dp-en { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 10.5px; letter-spacing: .14em; color: var(--a-ink3); display: block; margin-bottom: 6px; }
.arch-d-pager .dp-t { font-size: 15px; font-weight: 600; }
.arch-d-pager .next { text-align: right; }

/* ---------- 25㎡专题：副标题 / 简介 / 段落引导 ---------- */
.arch-d-subtitle { font-size: 19px; font-weight: 600; color: var(--a-accent-d); margin: 0 0 14px; letter-spacing: .02em; }
.arch-d-intro { font-size: 15px; line-height: 1.95; color: var(--a-ink2); margin: 0 0 4px; max-width: 780px; }
.arch-d-lede { font-size: 14.5px; line-height: 1.95; color: var(--a-ink2); margin: 0 0 18px; }

/* 设计挑战三卡 */
.arch-ch-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 26px; }
.arch-ch { border: 1px solid var(--a-line); border-top: 2px solid var(--a-accent); border-radius: 2px; background: var(--a-card); padding: 20px 18px; }
.arch-ch-no { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; color: var(--a-accent-d); letter-spacing: .12em; }
.arch-ch-t { font-size: 15.5px; font-weight: 700; margin: 10px 0 8px; }
.arch-ch-d { font-size: 13px; line-height: 1.8; color: var(--a-ink2); margin: 0; }

/* 方案适用条件条 */
.arch-plan-fit { display: flex; gap: 9px; align-items: baseline; background: var(--a-bg2); border-left: 2px solid var(--a-accent); border-radius: 2px; padding: 10px 13px; font-size: 12.5px; line-height: 1.7; color: var(--a-ink2); margin: 0 0 14px; }
.arch-plan-fit-tag { flex: none; font-size: 11px; font-weight: 700; letter-spacing: .08em; color: var(--a-accent-d); }

/* 结尾金句 */
.arch-closing { margin: 24px 0 0; padding: 24px 26px; border-left: 3px solid var(--a-accent); background: rgba(113, 125, 107, .08); border-radius: 2px; font-size: 18px; line-height: 1.8; font-weight: 600; color: var(--a-dark-2); }
.arch-closing-mark { color: var(--a-accent); font-size: 30px; line-height: 0; margin-right: 4px; vertical-align: -7px; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .arch-hero { padding: 124px 0 64px; }
  .arch-hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .arch-hero-media { aspect-ratio: 16 / 10; }
  .arch-feature { grid-template-columns: 1fr; gap: 30px; }
  .arch-f-media { aspect-ratio: 16 / 10; max-height: 420px; }
  .arch-about-grid { grid-template-columns: 1fr; gap: 32px; }
  .arch-tier-top { grid-template-columns: 1fr; gap: 22px; }
  .arch-tier-media { aspect-ratio: 16 / 10; }
}

@media (max-width: 720px) {
  .arch-wrap { padding: 0 20px; }
  .arch-sec { padding: 68px 0; }
  .arch-cost-grid { grid-template-columns: 1fr; }
  .arch-plan-grid, .arch-ba { grid-template-columns: 1fr; }
  .arch-plan-cols { grid-template-columns: 1fr; gap: 10px; }
  .arch-budget-legend { grid-template-columns: 1fr; }
  .arch-index-row { grid-template-columns: 40px 1fr 20px; gap: 14px; padding: 24px 4px; }
  .arch-index-row .ix-type { display: none; }
  .arch-index-row .ix-status { display: none; }
  .arch-d-pager { grid-template-columns: 1fr; }
  .arch-d-inner { padding: 0 20px 70px; }
  .arch-d-topbar-in { padding: 0 20px; }
  .arch-tier-row { grid-template-columns: 78px 1fr; gap: 14px; }
  .arch-tier-tab { min-width: 0; flex: 1; padding: 11px 14px; }
  .arch-h1 { font-size: clamp(46px, 15vw, 72px); }
  /* 防止长英文标签在窄屏溢出 */
  .arch-kicker { font-size: 10.5px; letter-spacing: .16em; }
  .arch-kicker::before { display: none; }
  .arch-ds-head { flex-wrap: wrap; gap: 6px 12px; }
  .arch-ds-title { font-size: 19px; }
  .arch-ds-en { margin-left: 0; }
  .arch-d-topmeta { display: none; }
  .arch-ch-grid { grid-template-columns: 1fr; gap: 12px; }
  .arch-closing { font-size: 16px; line-height: 1.75; padding: 20px; }
  .arch-d-subtitle { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  .arch-plan-media img, .arch-ba-media img, .arch-tier-panel, .arch-btn, .arch-index-row { transition: none !important; }
  .arch-tier-panel.active { animation: none; }
}