/* ============================================================
   平头路书官网 · v5「真实摄影 + 深度交互」设计系统
   2026-08-04 · 全站真实 CC 摄影（见 /about/image-credits.html）
   仅供 index.html / download.html 使用；
   legal / product / about / mini-program 页面继续使用 site.css。
   ============================================================ */

:root {
  --pine: #14352a;
  --pine-2: #1d4a39;
  --pine-3: #2c6a50;
  --sun: #ffcf3f;
  --clay: #b3541e;
  --sand: #f3efe6;
  --sand-2: #ece6d8;
  --ink: #171d19;
  --dim: #56605a;
  --faint: #8b948d;
  --line: #e3e6e0;
  --gold-text: #8a6a33;
  --font: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Noto Sans SC",
    -apple-system, "Segoe UI", system-ui, sans-serif;
  --container: 1280px;
  --gutter: clamp(20px, 4vw, 44px);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-lg: 0 24px 60px rgba(16, 28, 22, 0.16);
}

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

html { scroll-behavior: smooth; }

body.v4 {
  font-family: var(--font);
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.v4 img { max-width: 100%; display: block; }
.v4 a { color: inherit; text-decoration: none; }
.v4 ::selection { background: rgba(255, 207, 63, 0.5); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }

.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: var(--gold-text);
}
.kicker::before {
  content: "";
  width: 30px;
  height: 2px;
  background: var(--sun);
}
.sec-title {
  margin-top: 14px;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
}
.sec-sub { margin-top: 12px; color: var(--dim); font-size: 16px; max-width: 42em; }

/* ---------- 滚动浮现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.in-view { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: 0.08s; }
.reveal-d2 { transition-delay: 0.16s; }
.reveal-d3 { transition-delay: 0.24s; }

/* ---------- 顶栏 ---------- */
.v4-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.35s ease, box-shadow 0.35s ease, color 0.35s ease;
  color: #fff;
}
.v4-header.is-scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line), 0 10px 34px rgba(16, 28, 22, 0.07);
  color: var(--ink);
}
.v4-header--solid { position: sticky; background: #fff; color: var(--ink); box-shadow: 0 1px 0 var(--line); }
.v4-header__inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.v4-header__brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: 0.04em; }
.v4-nav { display: flex; gap: clamp(18px, 2.2vw, 30px); font-size: 15px; font-weight: 600; }
.v4-nav a { position: relative; opacity: 0.88; transition: opacity 0.25s ease; padding: 6px 0; }
.v4-nav a::after {
  content: "";
  position: absolute; left: 0; bottom: 2px;
  width: 100%; height: 2px; background: var(--sun);
  transform: scaleX(0); transform-origin: right;
  transition: transform 0.4s var(--ease);
}
.v4-nav a:hover { opacity: 1; }
.v4-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.v4-header__right { display: flex; align-items: center; gap: 14px; }
.v4-header__mini { font-size: 14px; font-weight: 600; opacity: 0.85; }
.v4-header__cta {
  background: var(--sun);
  color: var(--ink);
  padding: 10px 22px;
  font-size: 14.5px;
  font-weight: 800;
  border-radius: 999px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.v4-header__cta:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(230, 180, 30, 0.45); }

.v4-menu-btn {
  display: none;
  width: 44px; height: 44px;
  border: none; background: none; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  color: inherit;
}
.v4-menu-btn span { width: 24px; height: 2px; background: currentColor; transition: transform 0.35s var(--ease), opacity 0.25s; }
.v4-menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.v4-menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.v4-menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.v4-mobile-menu {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(255, 255, 255, 0.98);
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 var(--gutter); gap: 4px;
  opacity: 0; visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.v4-mobile-menu.is-open { opacity: 1; visibility: visible; }
.v4-mobile-menu a {
  font-size: clamp(26px, 7vw, 36px); font-weight: 800; color: var(--ink);
  padding: 13px 0; border-bottom: 1px solid var(--line);
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}
.v4-mobile-menu.is-open a { opacity: 1; transform: none; }
.v4-mobile-menu.is-open a:nth-child(2) { transition-delay: 0.05s; }
.v4-mobile-menu.is-open a:nth-child(3) { transition-delay: 0.1s; }
.v4-mobile-menu.is-open a:nth-child(4) { transition-delay: 0.15s; }
.v4-mobile-menu.is-open a:nth-child(5) { transition-delay: 0.2s; }
.v4-mobile-menu.is-open a:nth-child(6) { transition-delay: 0.25s; }
.v4-mobile-menu a em { font-style: normal; font-size: 12px; letter-spacing: 0.25em; color: var(--gold-text); display: block; font-weight: 700; }

/* ---------- 首屏 ---------- */
.v4-hero {
  position: relative;
  min-height: min(94svh, 820px);
  display: flex;
  align-items: flex-end;
  color: #fff;
}
.v4-hero__bg { position: absolute; inset: 0; overflow: hidden; }
.v4-hero__bg img {
  width: 100%; height: 100%; object-fit: cover;
  transform: scale(1);
  animation: v4-kenburns 26s ease-out forwards;
  will-change: transform;
}
@keyframes v4-kenburns { to { transform: scale(1.09); } }
.v4-hero__bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 16, 12, 0.35) 0%, rgba(10, 16, 12, 0.04) 34%, rgba(10, 16, 12, 0.72) 100%),
    linear-gradient(90deg, rgba(10, 16, 12, 0.52) 0%, rgba(10, 16, 12, 0.2) 55%, rgba(10, 16, 12, 0.06) 100%);
}
.v4-hero__inner { position: relative; z-index: 2; width: 100%; padding-top: 128px; padding-bottom: clamp(48px, 7vh, 80px); }
.v4-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 207, 63, 0.95);
  color: var(--ink);
  font-size: 13px; font-weight: 800;
  padding: 6px 14px; border-radius: 999px;
}
.v4-hero__title {
  margin-top: 20px;
  font-size: clamp(40px, 6.4vw, 76px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.01em;
  text-shadow: 0 2px 28px rgba(0, 0, 0, 0.4);
}
.v4-hero__title .line { display: block; overflow: hidden; }
.v4-hero__title .line > span { display: inline-block; transform: translateY(112%); animation: v4-rise 0.9s var(--ease) forwards; }
.v4-hero__title .line:nth-child(2) > span { animation-delay: 0.1s; }
@keyframes v4-rise { to { transform: translateY(0); } }
.v4-hero__sub {
  margin-top: 18px;
  font-size: clamp(15.5px, 1.7vw, 18px);
  font-weight: 500;
  max-width: 36em;
  opacity: 0;
  animation: v4-fade 0.9s ease 0.4s forwards;
}
@keyframes v4-fade { to { opacity: 0.96; } }

.v4-search-wrap { position: relative; z-index: 40; width: min(580px, 100%); margin-top: 28px; opacity: 0; animation: v4-fade 0.9s ease 0.55s forwards; }
.v4-search {
  background: #fff;
  border-radius: 999px;
  display: flex; align-items: center;
  padding: 7px 7px 7px 24px;
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.34);
}
.v4-search svg { flex-shrink: 0; color: var(--faint); margin-right: 10px; }
.v4-search input {
  flex: 1; border: none; outline: none;
  font-family: inherit; font-size: 16px; color: var(--ink);
  background: none; min-width: 0;
}
.v4-search input::placeholder { color: var(--faint); }
.v4-search button {
  background: var(--pine);
  color: #fff;
  border: none; cursor: pointer;
  font-family: inherit; font-weight: 800; font-size: 15px;
  padding: 13px 28px; border-radius: 999px;
  transition: background 0.25s ease, transform 0.3s var(--ease);
  flex-shrink: 0;
}
.v4-search button:hover { background: var(--pine-2); }
.v4-suggest {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: #fff; border-radius: 18px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  padding: 8px;
  display: none;
  z-index: 30;
}
.v4-suggest.is-open { display: block; }
.v4-suggest button {
  display: flex; align-items: center; gap: 10px;
  width: 100%; border: none; background: none; cursor: pointer;
  font-family: inherit; font-size: 15px; color: var(--ink);
  padding: 11px 14px; border-radius: 12px;
  text-align: left;
  transition: background 0.2s ease;
}
.v4-suggest button:hover, .v4-suggest button.is-active { background: var(--sand); }
.v4-suggest button i { font-style: normal; color: var(--faint); font-size: 12.5px; margin-left: auto; }

.v4-hero__facts {
  margin-top: 26px;
  display: flex; flex-wrap: wrap;
  gap: 10px 30px;
  font-size: 14px; font-weight: 600;
  opacity: 0;
  animation: v4-fade 0.9s ease 0.7s forwards;
}
.v4-hero__facts b { font-size: 17px; }
.v4-hero__facts .num { font-variant-numeric: tabular-nums; }

.v4-hero__credit {
  position: absolute; right: 16px; bottom: 14px; z-index: 3;
  font-size: 11.5px; letter-spacing: 0.04em;
  background: rgba(10, 16, 12, 0.45);
  padding: 5px 12px; border-radius: 999px;
  color: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(4px);
}
.v4-hero__credit a { text-decoration: underline; text-underline-offset: 2px; }

/* ---------- 线路名跑马灯 ---------- */
.v4-ticker {
  border-bottom: 1px solid var(--line);
  background: #fff;
  overflow: hidden;
  padding: 16px 0;
}
.v4-ticker__track { display: flex; width: max-content; animation: v4-marquee 96s linear infinite; }
.v4-ticker:hover .v4-ticker__track { animation-play-state: paused; }
.v4-ticker__group {
  display: flex; align-items: center; gap: 36px; padding-right: 36px;
  white-space: nowrap;
  font-size: 14px; font-weight: 600; letter-spacing: 0.14em;
  color: var(--dim);
}
.v4-ticker__group i { font-style: normal; color: var(--sun); font-size: 11px; }
@keyframes v4-marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- 三位一体（编辑排版，非卡片） ---------- */
.v4-triple { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(24px, 3.5vw, 56px); padding: clamp(56px, 7vw, 84px) 0 0; }
.v4-tri { border-top: 2.5px solid var(--ink); padding-top: 20px; }
.v4-tri .no { font-size: 12.5px; font-weight: 800; color: var(--gold-text); letter-spacing: 0.2em; }
.v4-tri h2, .v4-tri h3 { font-size: 21px; font-weight: 800; margin-top: 10px; }
.v4-tri p { margin-top: 8px; font-size: 14.5px; color: var(--dim); line-height: 1.8; }

/* ---------- 一本路书里有什么：手机交互演示 ---------- */
.v4-book { background: var(--sand); margin-top: clamp(60px, 8vw, 90px); }
.v4-book__inner {
  display: grid; grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(40px, 6vw, 80px); align-items: center;
  padding: clamp(60px, 8vw, 96px) 0;
}
.v4-chk { margin-top: 26px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px 26px; }
.v4-chk > div { display: flex; gap: 11px; font-size: 15px; font-weight: 700; line-height: 1.5; }
.v4-chk i {
  font-style: normal;
  width: 25px; height: 25px; border-radius: 50%;
  background: var(--pine); color: #fff;
  display: grid; place-items: center;
  font-size: 12px; flex-shrink: 0; margin-top: 1px;
}
.v4-chk small { display: block; font-weight: 400; color: var(--dim); font-size: 12.5px; }
.v4-book__note { margin-top: 22px; font-size: 13px; color: var(--faint); }

/* 手机演示 */
.v4-demo { display: flex; justify-content: center; }
.v4-phone {
  position: relative;
  width: min(340px, 88vw);
  border-radius: 48px;
  padding: 12px;
  background: linear-gradient(160deg, #2a322c, #10160f);
  box-shadow: var(--shadow-lg), inset 0 1px 1px rgba(255, 255, 255, 0.16);
}
.v4-phone::before {
  content: "";
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  width: 34%; height: 26px; background: #10160f;
  border-radius: 0 0 16px 16px; z-index: 5;
}
.v4-screen {
  position: relative;
  border-radius: 38px;
  overflow: hidden;
  background: #f5f3ec;
  display: flex; flex-direction: column;
  height: 620px;
}
.v4-scr-top {
  position: relative; z-index: 4;
  padding: 40px 16px 10px;
  background: linear-gradient(180deg, #f5f3ec 78%, rgba(245, 243, 236, 0));
}
.v4-scr-route { display: flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 800; color: var(--ink); }
.v4-scr-route .back { width: 26px; height: 26px; border-radius: 50%; background: #fff; display: grid; place-items: center; font-size: 13px; box-shadow: 0 2px 8px rgba(20, 40, 30, 0.12); }
.v4-scr-route .day-meta { font-weight: 600; color: var(--dim); font-size: 12px; margin-left: auto; font-variant-numeric: tabular-nums; }
.v4-days { display: flex; gap: 7px; margin-top: 10px; }
.v4-days button {
  border: none; cursor: pointer; font-family: inherit;
  font-size: 12.5px; font-weight: 800;
  padding: 6px 12px; border-radius: 999px;
  background: #fff; color: var(--dim);
  box-shadow: 0 2px 8px rgba(20, 40, 30, 0.1);
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s var(--ease);
}
.v4-days button.is-active { background: var(--pine); color: #fff; transform: translateY(-1px); }
.v4-scr-map { position: absolute; inset: 0; }
.v4-scr-map svg { width: 100%; height: 100%; }
.v4-map-seg { stroke: #c9d2c5; stroke-width: 5; fill: none; stroke-linecap: round; transition: stroke 0.4s ease, stroke-width 0.4s ease; }
.v4-map-seg.is-done { stroke: #9fb3a4; }
.v4-map-seg.is-active { stroke: url(#segGrad); stroke-width: 7; }
.v4-map-pin { transition: opacity 0.4s ease, transform 0.4s var(--ease); transform-origin: center; transform-box: fill-box; }
.v4-map-pin.is-dim { opacity: 0.25; }
.v4-map-cur { animation: v4-pulse 2.2s ease-out infinite; transform-origin: center; transform-box: fill-box; }
@keyframes v4-pulse { 0% { transform: scale(0.7); opacity: 0.9; } 70%, 100% { transform: scale(2.4); opacity: 0; } }
.v4-peek {
  position: relative; z-index: 4;
  margin-top: auto;
  background: #fff;
  border-radius: 22px 22px 34px 34px;
  padding: 14px 16px 16px;
  box-shadow: 0 -10px 30px rgba(20, 40, 30, 0.12);
}
.v4-peek__bar { width: 40px; height: 4px; border-radius: 99px; background: var(--line); margin: 0 auto 10px; }
.v4-peek__stats { font-size: 13.5px; font-weight: 800; }
.v4-peek__stats span { font-variant-numeric: tabular-nums; }
.v4-peek__note { margin-top: 3px; font-size: 12px; color: var(--dim); line-height: 1.55; min-height: 36px; }
.v4-peek__cta {
  margin-top: 10px;
  background: var(--pine); color: #fff;
  text-align: center;
  font-size: 14px; font-weight: 800;
  padding: 12px; border-radius: 999px;
}
.v4-demo-cap { text-align: center; margin-top: 16px; font-size: 12.5px; color: var(--faint); }

/* ---------- 精选路书：大图卡 ---------- */
.v4-routes { padding-top: clamp(64px, 8vw, 96px); }
.v4-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 1.8vw, 22px); margin-top: 34px; }
.v4-card {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  cursor: pointer;
  border: none; padding: 0;
  font-family: inherit; text-align: left;
  background: var(--sand-2);
  display: block; width: 100%;
  transition: transform 0.55s var(--ease), box-shadow 0.55s var(--ease);
}
.v4-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.v4-card img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.9s var(--ease);
}
.v4-card:hover img { transform: scale(1.06); }
.v4-card::after {
  content: "";
  position: absolute; inset: 0;
  /* 底部压暗层需独立于图片明暗成立（郎木寺白墙、竹海亮路实测临界） */
  background: linear-gradient(180deg, rgba(8, 14, 10, 0.04) 28%, rgba(8, 14, 10, 0.46) 58%, rgba(8, 14, 10, 0.88) 100%);
}
.v4-card__badge {
  position: absolute; top: 16px; left: 16px; z-index: 2;
  background: rgba(255, 255, 255, 0.94); color: var(--ink);
  font-size: 12px; font-weight: 800;
  padding: 6px 12px; border-radius: 999px; letter-spacing: 0.1em;
}
.v4-card__badge--free { background: var(--sun); }
.v4-card__go {
  position: absolute; top: 14px; right: 14px; z-index: 2;
  width: 42px; height: 42px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  display: grid; place-items: center;
  font-size: 16px;
  backdrop-filter: blur(6px);
  transition: background 0.3s ease, transform 0.45s var(--ease);
}
.v4-card:hover .v4-card__go { background: var(--sun); color: var(--ink); border-color: var(--sun); transform: rotate(-45deg); }
.v4-card__body { position: absolute; left: 22px; right: 22px; bottom: 18px; z-index: 2; color: #fff; }
.v4-card__region { font-size: 12.5px; font-weight: 700; letter-spacing: 0.18em; opacity: 0.85; }
.v4-card__body h3 { font-size: clamp(20px, 1.8vw, 25px); font-weight: 800; margin-top: 4px; }
.v4-card__nums {
  display: flex; flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 10px; padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.28);
  font-size: 13px; font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.v4-card__nums b { font-weight: 800; }
.v4-routes__note { margin-top: 22px; font-size: 13px; color: var(--faint); }
/* 收尾三卡：居中插画式 */
.v4-tail {
  aspect-ratio: 16 / 10;
  border-radius: 22px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; text-align: center; padding: 22px;
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}
.v4-tail svg { width: min(190px, 64%); height: auto; margin-bottom: 6px; }
.v4-tail h3 { font-size: clamp(18px, 1.6vw, 21px); font-weight: 800; color: var(--ink); }
.v4-tail p { font-size: 13.5px; color: var(--dim); }
.v4-tail p i { font-style: normal; color: var(--pine-3); font-weight: 800; }
a.v4-tail:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.v4-tail--catalog { background: linear-gradient(170deg, #f7f4ea, #efe9da); }
.v4-tail--making { background: linear-gradient(170deg, #eef2ec, #e2e9e0); border: 1.5px dashed rgba(44, 106, 80, 0.4); }
.v4-tail--voice { background: linear-gradient(170deg, #fff7dd, #f7ecc8); }

/* ---------- 线路详情浮层 ---------- */
.v4-overlay {
  position: fixed; inset: 0; z-index: 180;
  display: none;
  align-items: flex-start; justify-content: center;
  padding: clamp(0px, 3vw, 40px);
  background: rgba(12, 20, 15, 0.6);
  backdrop-filter: blur(10px);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.v4-overlay.is-open { display: flex; animation: v4-ov-fade 0.3s ease; }
@keyframes v4-ov-fade { from { opacity: 0; } }
.v4-ov-panel {
  position: relative;
  width: min(1000px, 100%);
  background: #fff;
  border-radius: clamp(0px, 2vw, 26px);
  overflow: hidden;
  margin: auto 0;
  animation: v4-ov-rise 0.45s var(--ease);
}
@keyframes v4-ov-rise { from { transform: translateY(36px); opacity: 0.4; } }
.v4-ov-hero { position: relative; aspect-ratio: 21 / 9; min-height: 240px; }
.v4-ov-hero img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.v4-ov-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(8,14,10,0.12) 40%, rgba(8,14,10,0.68) 100%); }
.v4-ov-hero__body { position: absolute; left: clamp(20px, 3vw, 36px); right: 20px; bottom: 20px; z-index: 2; color: #fff; }
.v4-ov-hero__body .region { font-size: 12.5px; font-weight: 700; letter-spacing: 0.2em; opacity: 0.85; }
.v4-ov-hero__body h3 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; margin-top: 4px; }
.v4-ov-hero__body p { margin-top: 6px; font-size: 14.5px; opacity: 0.92; }
.v4-ov-close {
  position: absolute; top: 14px; right: 14px; z-index: 4;
  width: 42px; height: 42px; border-radius: 50%;
  border: none; cursor: pointer;
  background: rgba(255, 255, 255, 0.92); color: var(--ink);
  font-size: 17px; font-weight: 700;
  display: grid; place-items: center;
  transition: transform 0.3s var(--ease), background 0.25s ease;
}
.v4-ov-close:hover { transform: rotate(90deg); background: var(--sun); }
.v4-ov-nav {
  position: absolute; top: 14px; left: 14px; z-index: 4;
  display: flex; gap: 8px;
}
.v4-ov-nav button {
  width: 42px; height: 42px; border-radius: 50%;
  border: none; cursor: pointer;
  background: rgba(255, 255, 255, 0.92); color: var(--ink);
  font-size: 16px;
  display: grid; place-items: center;
  transition: background 0.25s ease, transform 0.3s var(--ease);
}
.v4-ov-nav button:hover { background: var(--sun); transform: translateY(-2px); }
.v4-ov-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
}
.v4-ov-stats > div { padding: 18px 12px; text-align: center; border-right: 1px solid var(--line); }
.v4-ov-stats > div:last-child { border-right: none; }
.v4-ov-stats b { display: block; font-size: clamp(20px, 2.2vw, 26px); font-weight: 800; font-variant-numeric: tabular-nums; }
.v4-ov-stats b i { font-style: normal; font-size: 13px; color: var(--gold-text); margin-left: 2px; }
.v4-ov-stats span { font-size: 12px; letter-spacing: 0.14em; color: var(--faint); }
.v4-ov-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(24px, 3.4vw, 44px);
  padding: clamp(24px, 3.4vw, 40px);
}
.v4-ov-h4 { font-size: 14px; font-weight: 800; letter-spacing: 0.18em; color: var(--gold-text); margin-bottom: 16px; }
.v4-itin { list-style: none; position: relative; }
.v4-itin::before { content: ""; position: absolute; left: 15px; top: 10px; bottom: 10px; width: 2px; background: var(--line); }
.v4-itin li { position: relative; display: flex; gap: 16px; padding: 0 0 20px; }
.v4-itin li:last-child { padding-bottom: 0; }
.v4-itin .d {
  position: relative; z-index: 1;
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: var(--pine); color: #fff;
  display: grid; place-items: center;
  font-size: 11.5px; font-weight: 800;
}
.v4-itin .t { font-size: 15.5px; font-weight: 800; display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; }
.v4-itin .t i { font-style: normal; font-size: 12.5px; color: var(--gold-text); font-weight: 700; font-variant-numeric: tabular-nums; }
.v4-itin .n { margin-top: 3px; font-size: 13.5px; color: var(--dim); line-height: 1.7; }
.v4-elev { background: var(--sand); border-radius: 16px; padding: 16px 16px 8px; }
.v4-elev svg { width: 100%; height: auto; display: block; }
.v4-elev__cap { display: flex; justify-content: space-between; font-size: 11.5px; color: var(--faint); padding: 6px 4px 8px; font-variant-numeric: tabular-nums; }
.v4-ov-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.v4-ov-tags span {
  font-size: 13px; font-weight: 700;
  background: var(--sand); color: var(--ink);
  padding: 7px 14px; border-radius: 999px;
}
.v4-ov-season { margin-top: 16px; font-size: 13.5px; color: var(--dim); }
.v4-ov-season b { color: var(--clay); }
.v4-ov-ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.v4-ov-note { padding: 0 clamp(24px, 3.4vw, 40px) clamp(20px, 3vw, 30px); font-size: 12.5px; color: var(--faint); }

/* ---------- 行程构成（POI 类型统计） ---------- */
.v4-typebar { margin-top: 4px; }
.v4-typebar__track { display: flex; height: 12px; border-radius: 99px; overflow: hidden; background: var(--sand-2); }
.v4-typebar__track i { display: block; height: 100%; }
.v4-typebar__legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 12px; font-size: 13px; color: var(--dim); font-variant-numeric: tabular-nums; }
.v4-typebar__legend b { color: var(--ink); }
.v4-typebar__legend span::before { content: ""; display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; background: var(--dot, #999); }


/* ---------- 核心资产：线路图 ---------- */
.v4-maps { background: #0e1a14; color: #f4efe4; margin-top: clamp(64px, 8vw, 96px); padding: clamp(60px, 8vw, 96px) 0 0; overflow: hidden; }
.v4-maps .kicker { color: var(--sun); }
.v4-maps .kicker::before { background: var(--sun); }
.v4-maps__video { margin-top: 34px; border-radius: 20px; overflow: hidden; box-shadow: 0 34px 80px rgba(0,0,0,0.45); }
.v4-maps__video video { width: 100%; display: block; }
.v4-mapwall { margin-top: clamp(28px, 4vw, 44px); }
.v4-mapwall__track { display: flex; width: max-content; animation: v4-marquee 60s linear infinite; }
.v4-mapwall:hover .v4-mapwall__track { animation-play-state: paused; }
.v4-mapwall__group { display: flex; gap: 18px; padding-right: 18px; }
.v4-mapwall__group figure { width: 190px; flex-shrink: 0; background: #fdfbf4; border-radius: 8px; padding: 7px 7px 4px; box-shadow: 0 10px 26px rgba(0,0,0,0.35); transform: rotate(-0.6deg); }
.v4-mapwall__group figure:nth-child(even) { transform: rotate(0.7deg); }
.v4-mapwall__group img { width: 100%; height: 128px; object-fit: cover; border-radius: 4px; }
.v4-mapwall__group figcaption { font-size: 11px; color: #5a6158; text-align: center; padding: 3px 0 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.v4-maps__note { padding-top: 18px; padding-bottom: clamp(40px, 5vw, 56px); font-size: 12.5px; color: rgba(244,239,228,0.5); }

/* ---------- 全部线路总目录（清单式） ---------- */
.v4-cat { padding: clamp(60px, 8vw, 96px) 0 0; }
.v4-cat__rows { margin-top: 34px; border-top: 2.5px solid var(--ink); }
.v4-cat__row { display: grid; grid-template-columns: 220px 1fr; gap: 16px clamp(24px, 3vw, 48px); padding: 20px 0; border-bottom: 1px solid var(--line); }
.v4-cat__region { font-size: 16px; font-weight: 800; line-height: 1.5; }
.v4-cat__region em { display: block; font-style: normal; font-size: 12px; font-weight: 700; letter-spacing: 0.1em; color: var(--gold-text); margin-top: 3px; }
.v4-cat__names { font-size: 14px; color: var(--dim); line-height: 2.1; }
.v4-cat__n { white-space: nowrap; }
.v4-cat__n:not(:last-child)::after { content: "·"; margin: 0 10px; color: rgba(23, 29, 25, 0.25); }
.v4-cat__n--making { color: var(--faint); }
.v4-cat__n--making i { font-style: normal; font-size: 11px; font-weight: 700; color: var(--clay); border: 1px solid rgba(179, 84, 30, 0.45); border-radius: 99px; padding: 1px 8px; margin-left: 6px; vertical-align: 1px; }
@media (max-width: 760px) { .v4-cat__row { grid-template-columns: 1fr; gap: 6px; } }

/* ---------- 自驾活动 ---------- */
.v4-act { background: var(--pine); color: #fff; margin-top: clamp(64px, 8vw, 96px); position: relative; overflow: hidden; }
.v4-act__inner {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr 1.05fr;
  gap: clamp(36px, 5vw, 64px); align-items: center;
  padding: clamp(60px, 8vw, 96px) 0;
}
.v4-act .kicker { color: var(--sun); }
.v4-act .kicker::before { background: var(--sun); }
.v4-act__lead { margin-top: 16px; font-size: 16px; opacity: 0.92; line-height: 1.9; max-width: 30em; }
.v4-act ul { margin-top: 20px; list-style: none; display: flex; flex-direction: column; gap: 12px; font-size: 15px; font-weight: 600; }
.v4-act ul li { display: flex; gap: 10px; align-items: flex-start; }
.v4-act ul i { font-style: normal; color: var(--sun); flex-shrink: 0; }
.v4-act__note { margin-top: 22px; font-size: 13px; opacity: 0.72; }
.v4-actcard {
  position: relative;
  background: #fff; color: var(--ink);
  border-radius: 22px; overflow: hidden;
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.35);
  transition: transform 0.5s var(--ease);
}
.v4-actcard:hover { transform: translateY(-6px); }
.v4-actcard__ph { position: relative; aspect-ratio: 16 / 8.5; overflow: hidden; }
.v4-actcard__ph img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.9s var(--ease); }
.v4-actcard:hover .v4-actcard__ph img { transform: scale(1.05); }
.v4-actcard__tag {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  background: #1f8a4c; color: #fff;
  font-size: 12.5px; font-weight: 800;
  padding: 6px 13px; border-radius: 6px;
}
.v4-actcard__body { padding: 22px 24px 24px; }
.v4-actcard__body h3 { font-size: 19px; font-weight: 800; line-height: 1.45; }
.v4-actcard__meta { margin-top: 7px; font-size: 13.5px; color: var(--dim); font-variant-numeric: tabular-nums; }
.v4-actcard__bar { margin-top: 15px; height: 8px; background: #edefe9; border-radius: 99px; overflow: hidden; }
.v4-actcard__bar i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, #37a065, var(--pine-2));
  border-radius: 99px;
  transition: width 1.4s var(--ease);
}
.v4-actcard.in-view .v4-actcard__bar i { width: var(--pct, 60%); }
.v4-actcard__row { display: flex; justify-content: space-between; align-items: center; margin-top: 13px; gap: 12px; }
.v4-actcard__n { font-size: 13px; color: var(--dim); font-variant-numeric: tabular-nums; }
.v4-actcard__go {
  background: var(--sun); color: var(--ink);
  font-weight: 800; font-size: 14px;
  padding: 12px 22px; border-radius: 999px; flex-shrink: 0;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.v4-actcard__go:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(230, 180, 30, 0.5); }

/* ---------- 三笔账 ---------- */
.v4-value { background: var(--sand); padding: clamp(60px, 8vw, 96px) 0; }
.v4-acct { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2vw, 24px); margin-top: 32px; }
.v4-ac {
  background: #fff; border-radius: 20px; padding: 28px;
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}
.v4-ac:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.v4-ac__tag { font-size: 12px; font-weight: 800; letter-spacing: 0.18em; color: var(--gold-text); }
.v4-ac h3 { font-size: 19.5px; font-weight: 800; margin-top: 10px; }
.v4-ac p { margin-top: 9px; font-size: 14px; color: var(--dim); line-height: 1.85; }
.v4-ac__worth {
  margin-top: 14px; padding-top: 12px;
  border-top: 1.5px dashed var(--line);
  font-size: 14px; font-weight: 800; color: var(--pine-3);
}
.v4-vipline {
  margin-top: 28px;
  background: #fff8e0; border: 2px solid #f0dfa4; border-radius: 18px;
  padding: 20px 26px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.v4-vipline__l { font-size: 16px; font-weight: 800; }
.v4-vipline__l small { display: block; font-weight: 400; color: #8a7d5e; font-size: 13px; margin-top: 4px; }
.v4-vipline__go {
  background: var(--ink); color: #fff;
  font-weight: 800; font-size: 14px;
  padding: 13px 26px; border-radius: 999px; flex-shrink: 0;
  transition: transform 0.3s var(--ease);
}
.v4-vipline__go:hover { transform: translateY(-2px); }

/* ---------- FAQ ---------- */
.v4-faq { padding: clamp(60px, 8vw, 96px) 0 0; }
.v4-faq__list { margin-top: 28px; border-top: 1.5px solid var(--line); }
.v4-faq__item { border-bottom: 1.5px solid var(--line); }
.v4-faq__q {
  width: 100%; border: none; background: none; cursor: pointer;
  font-family: inherit; text-align: left;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 22px 4px;
  font-size: clamp(16px, 1.8vw, 18.5px); font-weight: 800; color: var(--ink);
  transition: color 0.25s ease;
}
.v4-faq__q:hover { color: var(--pine-3); }
.v4-faq__q i {
  font-style: normal; flex-shrink: 0;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1.5px solid var(--line);
  display: grid; place-items: center;
  font-size: 17px; font-weight: 600;
  transition: transform 0.4s var(--ease), background 0.3s ease, border-color 0.3s;
}
.v4-faq__item.is-open .v4-faq__q i { transform: rotate(45deg); background: var(--sun); border-color: var(--sun); }
.v4-faq__a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.45s var(--ease);
}
.v4-faq__a p { padding: 0 40px 22px 4px; font-size: 15px; color: var(--dim); max-width: 46em; }

/* ---------- 官方事实 ---------- */
.v4-facts { padding: clamp(60px, 8vw, 90px) 0 0; }
.v4-factlist { list-style: none; border-top: 1.5px solid var(--line); margin-top: 28px; }
.v4-factlist li { border-bottom: 1.5px solid var(--line); }
.v4-factlist a {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 24px 6px;
  transition: padding 0.35s var(--ease), background 0.3s ease;
}
.v4-factlist a:hover { padding-left: 18px; background: var(--sand); }
.v4-factlist strong { display: block; font-size: 18px; font-weight: 800; }
.v4-factlist span.desc { display: block; margin-top: 4px; font-size: 14px; color: var(--dim); }
.v4-factlist .arr {
  flex-shrink: 0; width: 42px; height: 42px; border-radius: 50%;
  border: 1.5px solid rgba(23, 29, 25, 0.25);
  display: grid; place-items: center; font-size: 16px;
  transition: background 0.3s ease, color 0.3s ease, transform 0.4s var(--ease), border-color 0.3s;
}
.v4-factlist a:hover .arr { background: var(--pine); border-color: var(--pine); color: #fff; transform: rotate(-45deg); }

/* ---------- 下载 CTA（照片带） ---------- */
.v4-dl { position: relative; margin-top: clamp(64px, 8vw, 96px); color: #fff; overflow: hidden; }
.v4-dl__bg { position: absolute; inset: 0; }
.v4-dl__bg img { width: 100%; height: 100%; object-fit: cover; }
.v4-dl__bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(12, 26, 19, 0.82), rgba(12, 26, 19, 0.55) 55%, rgba(12, 26, 19, 0.82)); }
.v4-dl__inner { position: relative; z-index: 2; padding: clamp(64px, 9vw, 110px) 0; text-align: center; }
.v4-dl h2 { font-size: clamp(30px, 4.6vw, 48px); font-weight: 800; line-height: 1.25; text-shadow: 0 2px 22px rgba(0,0,0,0.35); }
.v4-dl h2 em { font-style: normal; color: var(--sun); }
.v4-dl p { margin: 16px auto 0; max-width: 34em; font-size: 15.5px; opacity: 0.94; }
.v4-dl__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 36px; }
.v4-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 16px 34px; border-radius: 999px;
  font-size: 15.5px; font-weight: 800; cursor: pointer;
  border: none; font-family: inherit;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.25s ease;
  will-change: transform;
}
/* <a> 会命中 .v4 a{color:inherit}（0-1-1），此处用同级以上选择器锁定按钮文字色 */
.v4 a.v4-btn--yellow, .v4 button.v4-btn--yellow, .v4 a.v4-header__cta, .v4 a.v4-actcard__go { color: var(--ink); }
.v4 a.v4-btn--green, .v4 button.v4-btn--green, .v4 a.v4-vipline__go { color: #fff; }
.v4 a.v4-btn--ghost, .v4 button.v4-btn--ghost { color: #fff; }
.v4 a.v4-btn--outline, .v4 button.v4-btn--outline { color: var(--pine); }
.v4-btn--yellow { background: var(--sun); color: var(--ink); }
.v4-btn--yellow:hover { box-shadow: 0 16px 34px rgba(230, 180, 30, 0.45); }
.v4-btn--ghost { background: rgba(255, 255, 255, 0.08); color: #fff; border: 2px solid rgba(255, 255, 255, 0.78); backdrop-filter: blur(4px); }
.v4-btn--ghost:hover { background: rgba(255, 255, 255, 0.18); }
.v4-btn--green { background: var(--pine); color: #fff; }
.v4-btn--green:hover { box-shadow: 0 14px 30px rgba(20, 60, 40, 0.35); }
.v4-btn--outline { background: transparent; color: var(--pine); border: 2px solid var(--pine); }
.v4-btn--outline:hover { background: var(--sand); }
.v4-dl__hint { margin-top: 24px; font-size: 13px; opacity: 0.82; }
.v4-dl__hint a { color: var(--sun); text-decoration: underline; text-underline-offset: 3px; }
.v4-dl__credit { position: absolute; right: 14px; bottom: 12px; z-index: 3; font-size: 11px; color: rgba(255,255,255,0.6); }

/* ---------- 页脚 ---------- */
.v4-footer { background: #fff; border-top: 1px solid var(--line); padding: clamp(44px, 5vw, 64px) 0 36px; font-size: 14px; color: var(--dim); }
.v4-footer__top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 36px; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
.v4-footer__brand { font-size: 20px; font-weight: 800; color: var(--ink); }
.v4-footer__brand small { display: block; margin-top: 8px; font-size: 13px; font-weight: 400; color: var(--faint); }
.v4-footer__cols { display: flex; gap: clamp(36px, 5vw, 80px); flex-wrap: wrap; }
.v4-footer__col .v4-footer__h { font-size: 12.5px; letter-spacing: 0.25em; color: var(--faint); margin-bottom: 14px; font-weight: 700; }
.v4-footer__col a { display: block; padding: 4px 0; transition: color 0.25s ease; }
.v4-footer__col a:hover { color: var(--pine-3); }
.v4-footer__legal { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-top: 24px; font-size: 12.5px; color: var(--faint); }
.v4-footer__beian { display: flex; flex-wrap: wrap; gap: 16px; }
.v4-footer__beian a:hover { color: var(--pine-3); }

/* ---------- 下载页 ---------- */
.v4-dlhero { position: relative; padding: 150px 0 40px; overflow: hidden; background: linear-gradient(180deg, var(--sand), #fff); }
.v4-dlhero h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 800; line-height: 1.22; margin-top: 16px; }
.v4-dlhero p.lead { margin-top: 14px; font-size: 16.5px; color: var(--dim); max-width: 36em; }
.v4-platforms { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 44px; }
.v4-plat {
  border: 1.5px solid var(--line); border-radius: 20px;
  padding: clamp(26px, 3vw, 38px);
  background: #fff;
  transition: transform 0.5s var(--ease), border-color 0.3s ease, box-shadow 0.5s var(--ease);
}
.v4-plat:hover { transform: translateY(-6px); border-color: rgba(20, 53, 42, 0.35); box-shadow: var(--shadow-lg); }
.v4-plat__os { font-size: 12.5px; letter-spacing: 0.22em; color: var(--gold-text); font-weight: 800; }
.v4-plat h2, .v4-plat h3 { font-size: clamp(20px, 2.4vw, 26px); font-weight: 800; margin-top: 10px; }
.v4-plat p { margin-top: 8px; font-size: 14.5px; color: var(--dim); max-width: 30em; }
.v4-plat .v4-btn { margin-top: 22px; }
.v4-plat__meta { margin-top: 14px; font-size: 12.5px; color: var(--faint); }
.v4-plat__meta a { color: var(--pine-3); text-decoration: underline; text-underline-offset: 3px; }

.v4-steps {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: 20px; overflow: hidden;
  counter-reset: step; margin-top: 28px;
}
.v4-step { background: #fff; padding: clamp(24px, 3vw, 38px); }
.v4-step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-size: 34px; font-weight: 800; color: rgba(138, 106, 51, 0.35);
  display: block; margin-bottom: 12px; line-height: 1;
}
.v4-step h3 { font-size: 17.5px; font-weight: 800; margin-bottom: 6px; }
.v4-step p { font-size: 14px; color: var(--dim); }

.v4-company { margin-top: clamp(56px, 7vw, 80px); background: var(--sand); border-radius: 20px; padding: clamp(28px, 4vw, 44px); }
.v4-company h2 { font-size: 22px; font-weight: 800; margin-top: 10px; }
.v4-company p { margin-top: 10px; font-size: 14.5px; color: var(--dim); line-height: 2; }

/* ---------- 弹窗 ---------- */
.download-modal {
  position: fixed; inset: 0; z-index: 220;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background: rgba(12, 20, 15, 0.55);
  backdrop-filter: blur(8px);
  opacity: 0; visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.download-modal.is-visible { opacity: 1; visibility: visible; }
.download-modal__panel {
  width: min(430px, 100%);
  background: #fff; color: var(--ink);
  border-radius: 22px; padding: 32px 28px 26px;
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.4);
  transform: translateY(14px) scale(0.98);
  transition: transform 0.35s var(--ease);
}
.download-modal.is-visible .download-modal__panel { transform: none; }
.download-modal__title { font-size: 20px; font-weight: 800; }
.download-modal__text { margin-top: 10px; font-size: 14.5px; color: var(--dim); }
.download-modal__url {
  margin-top: 14px; padding: 12px 14px; border-radius: 12px;
  background: var(--sand);
  font-size: 14px; word-break: break-all;
  font-family: ui-monospace, monospace;
}
.download-modal__actions { display: flex; gap: 12px; margin-top: 22px; }
.download-modal__button {
  flex: 1; padding: 13px 10px; border-radius: 999px;
  font-size: 15px; font-weight: 700; cursor: pointer;
  border: 2px solid transparent; font-family: inherit;
  transition: transform 0.3s var(--ease);
}
.download-modal__button:active { transform: scale(0.97); }
.download-modal__button--primary { background: var(--pine); color: #fff; }
.download-modal__button--secondary { background: #fff; border-color: rgba(23, 29, 25, 0.3); color: var(--ink); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .v4-nav, .v4-header__mini { display: none; }
  .v4-menu-btn { display: flex; }
  .v4-triple { grid-template-columns: 1fr; gap: 28px; }
  .v4-book__inner { grid-template-columns: 1fr; }
  .v4-demo { order: 2; }
  .v4-cards { grid-template-columns: 1fr 1fr; }
  .v4-card { aspect-ratio: 16 / 11; }
  .v4-act__inner { grid-template-columns: 1fr; }
  .v4-acct { grid-template-columns: 1fr; }
  .v4-platforms { grid-template-columns: 1fr; }
  .v4-steps { grid-template-columns: 1fr; }
  .v4-vipline { flex-direction: column; align-items: flex-start; }
  .v4-ov-grid { grid-template-columns: 1fr; }
  .v4-ov-stats { grid-template-columns: repeat(2, 1fr); }
  .v4-ov-stats > div:nth-child(2) { border-right: none; }
  .v4-ov-stats > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 560px) {
  .v4-cards { grid-template-columns: 1fr; }
  .v4-hero__facts { gap: 8px 18px; }
  .v4-search button { padding: 12px 18px; }
  .v4-dl__actions { flex-direction: column; align-items: stretch; }
  .v4-screen { height: 560px; }
  .v4-overlay { padding: 0; }
}

/* ---------- 无障碍与降级 ---------- */
.v4 a:focus-visible, .v4 button:focus-visible, .v4 input:focus-visible {
  outline: 2.5px solid var(--pine-3);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .v4 *, .v4 *::before, .v4 *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
  .reveal { opacity: 1; transform: none; }
  .v4-hero__title .line > span { transform: none; }
  .v4-hero__sub, .v4-search-wrap, .v4-hero__facts { opacity: 1; }
  .v4-hero__bg img { animation: none; }
  .v4-ticker__track { animation: none; }
  .v4-mapwall__track { animation: none; }
  .v4-ticker__group { padding-left: var(--gutter); }
  .v4-actcard .v4-actcard__bar i { width: var(--pct, 60%); }
}

/* ============================================================
   官方事实页（GEO）v5 皮肤 —— 仅作用于 body.page-fact，
   内容标记零改动（product/pingtou-roadbook 等三页），
   legal / mini-program 页仍用 site.css，不受影响。
   ============================================================ */
body.page-fact { font-family: var(--font); color: var(--ink); background: #fff; line-height: 1.85; -webkit-font-smoothing: antialiased; }
.page-fact a { color: inherit; text-decoration: none; }
.page-fact img { max-width: 100%; }

.page-fact .site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(16px); box-shadow: 0 1px 0 var(--line), 0 10px 34px rgba(16,28,22,0.06); }
.page-fact .site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 68px; }
.page-fact .site-header__brand { font-weight: 800; font-size: 19px; letter-spacing: 0.04em; display: flex; align-items: center; gap: 9px; }
.page-fact .site-header__brand::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--sun); }
.page-fact .site-nav { display: flex; gap: clamp(14px, 2vw, 26px); font-size: 14.5px; font-weight: 600; color: var(--dim); overflow-x: auto; }
.page-fact .site-nav a { padding: 6px 0; white-space: nowrap; transition: color .25s; }
.page-fact .site-nav a:hover { color: var(--ink); }
.page-fact .site-nav a.is-active { color: var(--ink); box-shadow: inset 0 -2px 0 var(--sun); }
.page-fact .site-header__cta { background: var(--sun); color: var(--ink); padding: 10px 20px; font-size: 14px; font-weight: 800; border-radius: 999px; white-space: nowrap; transition: transform .3s var(--ease), box-shadow .3s var(--ease); }
.page-fact .site-header__cta:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(230,180,30,0.4); }

.page-fact .fact-main { padding: clamp(28px, 4vw, 48px) 0 clamp(56px, 7vw, 80px); }
.page-fact .breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--faint); margin-bottom: clamp(20px, 3vw, 32px); }
.page-fact .breadcrumbs a:hover { color: var(--pine-3); }

.page-fact .fact-hero { max-width: 880px; margin-bottom: clamp(30px, 4vw, 44px); }
.page-fact .fact-hero__kicker { display: flex; align-items: center; gap: 12px; font-size: 13px; font-weight: 800; letter-spacing: 0.22em; color: var(--gold-text); }
.page-fact .fact-hero__kicker::before { content: ""; width: 30px; height: 2px; background: var(--sun); }
.page-fact .fact-hero h1 { margin-top: 14px; font-size: clamp(26px, 3.6vw, 40px); font-weight: 800; line-height: 1.3; }
.page-fact .fact-hero__answer { margin-top: 18px; background: var(--sand); border-left: 4px solid var(--sun); border-radius: 0 14px 14px 0; padding: 18px 22px; font-size: 15.5px; color: var(--ink); }
.page-fact .fact-hero__note { margin-top: 12px; font-size: 14px; color: var(--dim); }

.page-fact .fact-layout { display: grid; grid-template-columns: minmax(0,1fr) 240px; gap: clamp(28px, 4vw, 56px); align-items: start; }
.page-fact .fact-content { max-width: 760px; min-width: 0; }
.page-fact .fact-section { margin-bottom: clamp(28px, 4vw, 40px); }
.page-fact .fact-section h2 { font-size: clamp(20px, 2.4vw, 26px); font-weight: 800; padding-top: 10px; margin-bottom: 12px; border-top: 2.5px solid var(--ink); }
.page-fact .fact-section h3 { font-size: 17px; font-weight: 800; margin: 18px 0 8px; }
.page-fact .fact-section p { margin-bottom: 12px; font-size: 15px; color: #3c463f; }
.page-fact .fact-section ul, .page-fact .fact-section ol { margin: 0 0 12px 1.3em; font-size: 15px; color: #3c463f; }
.page-fact .fact-section li { margin-bottom: 6px; }
.page-fact .fact-table-wrap { overflow-x: auto; margin: 14px 0; border: 1.5px solid var(--line); border-radius: 14px; }
.page-fact .fact-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 520px; }
.page-fact .fact-table th { background: var(--sand); text-align: left; font-weight: 800; padding: 12px 14px; }
.page-fact .fact-table td { padding: 11px 14px; border-top: 1px solid var(--line); color: #3c463f; }
.page-fact .faq-list dt { font-weight: 800; font-size: 15.5px; margin-top: 16px; }
.page-fact .faq-list dd { margin: 6px 0 0; font-size: 14.5px; color: var(--dim); }
.page-fact .fact-date { margin-top: 22px; font-size: 13px; color: var(--faint); border-top: 1.5px dashed var(--line); padding-top: 14px; }

.page-fact .fact-aside { position: sticky; top: 92px; border: 1.5px solid var(--line); border-radius: 16px; padding: 18px 20px; font-size: 14px; }
.page-fact .fact-aside strong { display: block; font-size: 12.5px; letter-spacing: 0.22em; color: var(--gold-text); margin-bottom: 10px; }
.page-fact .fact-aside a { display: block; padding: 6px 0; color: var(--dim); border-bottom: 1px solid var(--line); transition: color .25s, padding-left .3s var(--ease); }
.page-fact .fact-aside a:last-child { border-bottom: none; }
.page-fact .fact-aside a:hover { color: var(--pine-3); padding-left: 6px; }

.page-fact .fact-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 10px; }
.page-fact .fact-link-card { border: 1.5px solid var(--line); border-radius: 16px; padding: 20px 22px; transition: transform .45s var(--ease), border-color .3s, box-shadow .45s var(--ease); }
.page-fact .fact-link-card:hover { transform: translateY(-5px); border-color: rgba(20,53,42,0.35); box-shadow: var(--shadow-lg); }
.page-fact .fact-link-card strong { display: block; font-size: 16.5px; font-weight: 800; margin-bottom: 6px; }
.page-fact .fact-link-card span { font-size: 13.5px; color: var(--dim); }

.page-fact .site-footer { background: #fff; border-top: 1px solid var(--line); padding: 34px 0; font-size: 13.5px; color: var(--dim); }
.page-fact .site-footer__content { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; }
.page-fact .site-footer__links { display: flex; flex-wrap: wrap; gap: 18px; }
.page-fact .site-footer__links a:hover, .page-fact .site-footer__beian a:hover { color: var(--pine-3); }
.page-fact .site-footer__beian { display: flex; flex-wrap: wrap; gap: 16px; color: var(--faint); }
.page-fact .site-footer__copyright { margin-top: 12px; font-size: 12.5px; color: var(--faint); }

@media (max-width: 900px) {
  .page-fact .fact-layout { grid-template-columns: 1fr; }
  .page-fact .fact-aside { position: static; order: -1; }
  .page-fact .site-header__cta { display: none; }
}