/* ============================================================
   百寿岩 BAISHOUYAN — 天然苏打水官网
   纯静态展示官网 · 共享样式
   ============================================================ */

:root {
  --navy: #2b3245;
  --navy-deep: #20263a;
  --ink: #1f2533;
  --gray-1: #5b6573;
  --gray-2: #8a93a3;
  --line: #e7eaef;
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --bg-mist: #eef2f6;
  --blue: #2f6fb0;
  --blue-deep: #1f4e7d;
  --teal: #2aa6c4;
  --gold: #c9a45c;
  --gold-soft: rgba(201, 164, 92, 0.14);
  --max: 1200px;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(31, 49, 71, 0.10);
  --shadow-sm: 0 8px 24px rgba(31, 49, 71, 0.08);
  --t: 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue",
    Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 32px; }

/* ---------- section heads ---------- */
.eyebrow {
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--gold);
  font-weight: 600;
  text-transform: uppercase;
}
.sec-head { text-align: center; margin-bottom: 56px; }
.sec-head h2 {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--ink);
  margin-top: 14px;
}
.sec-head .sub { color: var(--gray-2); margin-top: 14px; font-size: 16px; letter-spacing: 1px; }
.sec-head .rule {
  width: 56px; height: 3px; margin: 22px auto 0;
  background: linear-gradient(90deg, var(--gold), #e3be7b);
  border-radius: 3px;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 34px; border-radius: 40px;
  font-size: 15px; letter-spacing: 1px; font-weight: 600;
  background: linear-gradient(120deg, #2f6fb0, #2aa6c4);
  color: #fff; transition: var(--t);
  box-shadow: 0 10px 26px rgba(47, 111, 176, 0.35);
}
.btn:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(47, 111, 176, 0.45); }

.link-more {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--blue); font-weight: 600; font-size: 15px; letter-spacing: 1px;
  transition: var(--t);
}
.link-more .arrow { transition: var(--t); }
.link-more:hover .arrow { transform: translateX(6px); }

/* 金色描边按钮（设计稿：查看更多 / 查看我们的水源地） */
.btn-outline {
  display: inline-flex; align-items: center; justify-content: center; gap: 16px;
  height: 55px; padding: 0 32px;
  border: 1px solid rgba(204, 162, 85, 1);
  color: rgba(204, 162, 85, 1); font-size: 18px; letter-spacing: 1px;
  background: transparent; transition: var(--t);
}
.btn-outline .arrow-ico { width: 20px; height: 7px; object-fit: contain; transition: var(--t); }
.btn-outline:hover { background: rgba(204, 162, 85, 1); color: #fff; }
.btn-outline:hover .arrow-ico { transform: translateX(6px); filter: brightness(0) invert(1); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: var(--t);
}
.site-header .bar {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo { position: relative; height: 36px; }
.brand .logo img { display: block; height: 36px; width: auto; transition: opacity var(--t); }
.brand .logo .logo-dark { position: absolute; top: 0; left: 0; opacity: 0; }
.nav { display: flex; align-items: center; gap: 38px; }
.nav a {
  position: relative; color: rgba(255,255,255,0.92); font-size: 16px; letter-spacing: 1px;
  font-weight: 500; transition: var(--t); padding: 6px 0;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--gold); transition: var(--t);
}
.nav a:hover::after, .nav a.active::after { width: 100%; }
.nav a.active { color: #fff; }

/* scrolled / solid header */
.site-header.solid { background: rgba(255,255,255,0.92); backdrop-filter: blur(14px); box-shadow: 0 2px 20px rgba(31,49,71,0.06); }
.site-header.solid .nav a { color: var(--gray-1); }
.site-header.solid .nav a.active { color: var(--ink); }
.site-header.solid .brand .logo-light { opacity: 0; }
.site-header.solid .brand .logo-dark { opacity: 1; }
/* pages with light hero start solid */
.site-header.on-light:not(.solid) .nav a { color: var(--gray-1); }
.site-header.on-light:not(.solid) .brand .logo-light { opacity: 0; }
.site-header.on-light:not(.solid) .brand .logo-dark { opacity: 1; }

.nav-toggle { display: none; }

/* ============================================================
   HERO (generic)
   ============================================================ */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  background-size: cover; background-position: center; color: #fff;
}
.hero::after {
  content:""; position:absolute; inset:0;
  background: linear-gradient(180deg, rgba(20,28,44,0.35) 0%, rgba(20,28,44,0.05) 40%, rgba(20,28,44,0.2) 100%);
}
.hero .wrap { position: relative; z-index: 2; }
.hero-fade-in > * { opacity: 0; transform: translateY(28px); animation: rise .9s forwards; }
.hero-fade-in > *:nth-child(2){ animation-delay:.12s; }
.hero-fade-in > *:nth-child(3){ animation-delay:.24s; }
.hero-fade-in > *:nth-child(4){ animation-delay:.36s; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ============================================================
   SHARED: reveal on scroll
   ============================================================ */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .8s ease, transform .8s cubic-bezier(.22,.61,.36,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .1s; }
.reveal.d2 { transition-delay: .2s; }
.reveal.d3 { transition-delay: .3s; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: var(--navy-deep); color: rgba(255,255,255,0.72); padding: 64px 0 30px; }
.footer-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.10); }
.footer-brand .logo { height: 40px; width: auto; }
.footer-brand .slogan { margin-top: 14px; font-size: 14px; letter-spacing: 2px; color: rgba(255,255,255,0.55); }
.footer-nav { display: flex; gap: 48px; }
.footer-nav a { font-size: 15px; color: rgba(255,255,255,0.78); transition: var(--t); }
.footer-nav a:hover { color: var(--gold); }
.footer-bottom { padding-top: 26px; text-align: center; font-size: 13px; letter-spacing: 1px; color: rgba(255,255,255,0.4); }

/* ============================================================
   GLOBAL CTA band (bottle array)
   ============================================================ */
.cta-band {
  position: relative; text-align: center; color: #fff;
  padding: 120px 0; background-size: cover; background-position: center;
}
.cta-band::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(31,49,71,0.18), rgba(31,49,71,0.42)); }
.cta-band .wrap { position: relative; z-index: 2; }
.cta-band h2 { font-size: 40px; letter-spacing: 4px; font-weight: 700; margin-bottom: 34px; text-shadow: 0 4px 24px rgba(0,0,0,.25); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .wrap { padding: 0 20px; }
  .sec-head h2 { font-size: 22px; }
  .nav { display: none; }
  .nav-toggle { display: flex; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: 0; }
  .nav-toggle span { width: 26px; height: 2px; background: #fff; display: block; transition: var(--t); }
  .site-header.solid .nav-toggle span, .site-header.on-light:not(.solid) .nav-toggle span { background: var(--navy); }
  .site-header .nav.open {
    display: flex; flex-direction: column; gap: 0; position: absolute; top: 76px; left: 0; right: 0; z-index: 200;
    background: rgba(255,255,255,0.98); backdrop-filter: blur(14px); padding: 8px 0; box-shadow: var(--shadow-sm);
  }
  .site-header .nav.open a { color: var(--ink); padding: 14px 24px; }
  .site-header .nav.open a::after { display: none; }
  .footer-top { flex-direction: column; }
  .footer-nav { gap: 24px; flex-wrap: wrap; }
}

/* ============================================================
   HOME PAGE
   ============================================================ */
@media (min-width: 901px) {
  .home-hero { background-image: url(../img/home-hero-bg.webp); }
}
.home-hero::after { background: linear-gradient(90deg, rgba(255,255,255,0.55), rgba(255,255,255,0) 55%); }
.home-hero .hero-inner { max-width: 560px; color: rgba(109,128,151,1); text-align: center; padding-top: 90px; }
.home-hero .hero-title { width: 380px; max-width: 84%; height: auto; margin: 0 auto 8px; }
.home-hero .tag { font-size: 24px; letter-spacing: 10px; color: rgba(109,128,151,1); font-weight:500; }
.home-hero .hero-line { display:block; width: 76px; height: 3px; margin: 16px auto; border-radius: 4px; background: rgba(227,190,123,1); }
.home-hero .desc { margin: 32px 0 18px; font-size: 18px; color: rgba(109,128,151,1); letter-spacing: 3px; }
.home-hero .feats { display:flex; gap: 16px; margin-bottom: 32px; flex-wrap: nowrap; }
.home-hero .feats div {
  flex: 1; font-size:14px; color: rgba(109,128,151,1); font-weight: 500; white-space: nowrap;
  display:flex; flex-direction: column; align-items:center; gap:10px;
  padding: 16px 12px; transition: var(--t);
}
.home-hero .feats div:hover { transform: translateY(-3px); }
.home-hero .feats div img {
  width: 50px; height: 50px; padding: 12px; border-radius: 50%;
  background: rgba(47,111,176,0.10); object-fit: contain; flex: 0 0 auto;
}

/* world cold spring */
.cold-spring { padding: 70px 0; }
.cs-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 64px; align-items: start; }
.cs-grid .cs-pics { margin-top: 72px; }
.cs-text .eyebrow { display:block; }
.cs-text h2 { font-size: 40px; font-weight: 700; letter-spacing: 2px; margin: 16px 0 0; color: var(--ink); }
.cs-text .cs-line { display: block; width: 88px; height: 4px; margin: 6px 0 64px; border-radius: 4px; background: rgba(204,162,85,1); }
.cs-text .place { font-size: 20px; color: var(--blue-deep); font-weight: 600; letter-spacing: 4px; margin-bottom: 18px; }
.cs-text .place .place-icon { display: block; width: 26px; height: auto; margin-bottom: 8px; }
.cs-text p { color: var(--gray-1); font-size: 16px; letter-spacing: .5px; margin-bottom: 30px; }
.cs-pics { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cs-pics img { width: 100%; height: auto; object-fit: contain; border-radius: var(--radius); box-shadow: var(--shadow); aspect-ratio: 329/524; }

/* deep spring feature (image + text) */
.deep-feature { padding: 0 0 120px; }
.df-banner { position: relative; }
.df-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: stretch; }
.df-grid img { width: 100%; height: auto; object-fit: contain; border-radius: 10px; box-shadow: var(--shadow); align-self: start; }
.df-grid .df-body { padding: 0; display:flex; flex-direction: column; justify-content: center; gap: 0; }
.df-grid .df-body h3 { font-size: 22px; letter-spacing: 2px; margin-bottom: 4px; color: var(--ink); line-height: 1.3; }
.df-grid .df-body h3:not(:first-child){ margin-top: 16px; }
.df-grid .df-body p { color: var(--gray-1); font-size: 15px; line-height: 1.6; margin: 0; }

/* real deep section */
.real-deep { padding: 70px 0; background: var(--bg-soft); }
.rd-cards { display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; margin-top: 8px; }
.rd-stack { display: grid; grid-template-rows: 1fr 1fr; gap: 24px; }
.rd-card { position: relative; border-radius: var(--radius); overflow: hidden; min-height: 260px; color:#fff; display:flex; align-items:flex-end; box-shadow: var(--shadow-sm); }
.rd-card img { position:absolute; inset:0; width:100%; height:100%; object-fit: cover; transition: transform .6s ease; }
.rd-card:hover img { transform: scale(1.05); }
.rd-card .ov { position: relative; z-index:2; padding: 30px; width:100%; background: linear-gradient(180deg, transparent, rgba(20,28,44,0.8)); }
.rd-card.big { min-height: 0; background: #fff; display: block; }
.rd-card.big img { position: relative; width: 100%; height: auto; }
.rd-card.big .ov {
  position: absolute; left: 0; bottom: 0;
  display: flex; align-items: center; justify-content: space-between;
  background: linear-gradient(180deg, rgba(0,0,0,0) 0%, #000000 100%);
}
.rd-card.big .ov h3, .rd-card.big .ov .small { margin: 0; }
.rd-card.big .ov { padding-top: 76px; }
.rd-card.big .ov-icon { position: absolute; left: 30px; top: 24px; width: 34px; height: auto; }
.rd-card h3 { font-size: 22px; letter-spacing: 1px; }
.rd-card .small { font-size: 14px; color: rgba(255,255,255,0.8); margin-top: 6px; }

/* crowd */
.crowd { padding: 70px 0; }
.crowd-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.crowd-card { position: relative; border-radius: var(--radius); overflow:hidden; aspect-ratio: 3/4; box-shadow: var(--shadow-sm); }
.crowd-card img { position:absolute; inset:0; width:100%; height:100%; object-fit: cover; transition: transform .6s ease; }
.crowd-card:hover img { transform: scale(1.06); }
.crowd-card .ov { position:absolute; inset:0; z-index:2; display:flex; flex-direction: column; justify-content:flex-end; padding: 26px; background: linear-gradient(180deg, rgba(20,28,44,0) 40%, rgba(20,28,44,0.85)); color:#fff; }
.crowd-card .ov h3 { font-size: 20px; letter-spacing:1px; }
.crowd-card .ov p { font-size: 13px; color: rgba(255,255,255,0.8); margin-top:6px; }

@media (max-width: 900px){
  .home-hero { background-image: url(../img/home-hero-mobile-bg.jpg); background-image: url(../img/home-hero-mobile-bg.webp); background-position: center center; }
  .home-hero { align-items: flex-start; padding-top: 100px; }
  .home-hero .hero-inner { text-align: center; padding-top: 6px; }
  .home-hero .btn-outline { display: none; }
  .home-hero .hero-title { width: 160px; margin: 0 auto 8px; }
  .home-hero .hero-line { margin: 10px auto; height: 2px; }
  .water-hero .hero-line { height: 2px; }
  .cs-text .cs-line { height: 2px; }
  .sec-head .rule { height: 2px; }
  .home-hero h1 { font-size: 32px; letter-spacing: 3px; }
  .home-hero .tag { font-size: 18px; letter-spacing: 6px; }
  .home-hero .desc { font-size: 15px; margin: 24px 0 12px; }
  .btn-outline { height: 40px; padding: 0 20px; font-size: 14px; gap: 10px; }
  .btn-outline .arrow-ico { width: 16px; }
  .cs-text h2 { font-size: 28px; }
  .cta-band h2 { font-size: 26px; letter-spacing: 3px; }
  .home-hero .feats { flex-wrap: nowrap; gap: 6px; margin-bottom: 20px; justify-content: center; }
  .home-hero .feats div { flex: 1; font-size: 11px; padding: 10px 4px; gap: 6px; }
  .home-hero .feats div img { width: 32px; height: 32px; padding: 7px; }
  .cs-grid, .df-grid { grid-template-columns: 1fr; }
  .rd-cards { grid-template-columns: 1fr; }
  .rd-card.big { min-height: 300px; }
  .rd-card h3 { font-size: 16px; letter-spacing: 1px; }
  .rd-card.big .ov h3 { font-size: 16px; }
  .rd-card.big .ov-icon { width: 22px; top: 14px; }
  .rd-card.big .ov { padding-top: 50px; }
  .rd-card .small { font-size: 12px; }
  .crowd-grid { grid-template-columns: 1fr 1fr; }
  .crowd-card .ov { padding: 14px; }
  .crowd-card .ov h3 { font-size: 14px; letter-spacing: 0; }
  .crowd-card .ov p { font-size: 11px; margin-top: 3px; }
  .df-grid .df-body { padding: 40px 28px; }
  .df-grid .df-body h3 { font-size: 17px; }
  .df-grid .df-body p { font-size: 14px; }
}

/* ============================================================
   WATER SOURCE PAGE
   ============================================================ */
.water-hero { background-image: url(../img/water-hero-bg.jpg); background-image: url(../img/water-hero-bg.webp); min-height: 100vh; }
.water-hero::after { background: linear-gradient(180deg, rgba(20,40,55,0.45), rgba(20,40,55,0.15) 50%, rgba(20,40,55,0.35)); }
.water-hero .hero-inner { max-width: 720px; }
.water-hero h1 { font-size: 50px; font-weight: 800; letter-spacing: 5px; line-height: 1.25; text-shadow: 0 4px 24px rgba(0,0,0,.3); }
.water-hero .hero-line { display:block; width: 121px; height: 4px; margin: 28px 0 0; border-radius: 4px; background: rgba(227,190,123,1); }
.water-hero p { margin-top: 22px; font-size: 18px; letter-spacing: 1px; color: rgba(255,255,255,0.92); max-width: 620px; }

/* geology */
.geology { padding: 70px 0; }
.geo-grid { display: grid; grid-template-columns: auto 1fr; gap: 0; align-items: center; }
/* 左侧：瓶子 + 地层剖面图 并排，底部对齐、整体靠右贴近指示视图 */
.geo-visual { display: flex; align-items: flex-end; justify-content: flex-end; gap: 0; }
.geo-visual .geo-bottle { height: 380px; width: auto; filter: drop-shadow(0 18px 30px rgba(31,49,71,.18)); }
.geo-visual .geo-section { height: 480px; width: auto; }
/* 右侧：地层条列表（总高度低于地层图） */
.geo-info { padding: 0; }
.geo-info h3 { font-size: 22px; color: rgba(204,162,85,1); letter-spacing: 1px; margin-bottom: 18px; text-align: right; padding-right: 20px; }
.geo-layers { list-style: none; display: flex; flex-direction: column; }
.geo-layers li {
  display:flex; align-items:center; gap: 16px; padding: 0 26px; font-size: 17px; color: #5b5347;
  background-size: 100% 100%; background-repeat: no-repeat;
}
.geo-layers li .ld {
  width: 100px; height: 16px; flex: 0 0 100px;
  background: url(../img/geo-linedot.webp) center / contain no-repeat;
}
.geo-layers .geo-l1 { height: 56px; background-image: url(../img/geo-layer1.webp); }
.geo-layers .geo-l2 { height: 64px; background-image: url(../img/geo-layer2.webp); }
.geo-layers .geo-l3 { height: 78px; background-image: url(../img/geo-layer3.webp); }
.geo-layers .geo-l4 { height: 68px; background-image: url(../img/geo-layer4.webp); }
.geo-layers .geo-l5 { height: 58px; background-image: url(../img/geo-layer5.webp); }
.geo-layers .geo-l6 { height: 56px; background-image: url(../img/geo-layer6.webp); color: rgba(204,162,85,1); font-weight: 700; }

/* ph */
.ph-sec { padding: 70px 0; background: var(--bg-soft); }
.ph-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; margin-top: 8px; }
.ph-title { font-size: 20px; color: var(--ink); font-weight: 600; letter-spacing: 1px; margin-bottom: 24px; }
/* 一条条竖色条 */
.ph-scale { display:flex; gap: 10px; margin-bottom: 14px; }
.ph-scale .ph-col { flex: 1; display:flex; flex-direction: column; align-items:center; gap: 12px; }
.ph-scale .ph-col .bar { width: 100%; height: 64px; border-radius: 6px; }
.ph-scale .ph-col .v { font-size: 13px; color: var(--gray-1); }
/* 酸性 ← 中性 → 碱性 轴 */
/* 酸碱轴：中性居中，两侧各一条带箭头线图（左指酸性、右指碱性） */
.ph-axis { display:flex; align-items:center; gap: 12px; margin-bottom: 34px; }
.ph-axis .lbl, .ph-axis .mid { font-size: 14px; color: var(--gray-1); white-space: nowrap; }
.ph-axis .arrow-line { flex: 1; height: 9px; width: auto; object-fit: contain; }
.ph-note { margin-top: 30px; }
.ph-note h4 { color: var(--blue-deep); font-size: 18px; margin-bottom: 10px; letter-spacing:1px; }
.ph-note p { color: var(--gray-1); font-size: 15px; }
.ph-visual { position: relative; }
.ph-visual .ph-cups { width: 100%; border-radius: var(--radius); display:block; }
.ph-badge {
  position: absolute; top: 10px; left: 38%; transform: translateX(-50%);
  width: 96px; height: 96px; border-radius: 50%;
  background: rgba(204,162,85,1); box-shadow: 0 14px 30px rgba(204,162,85,.4);
  display:flex; flex-direction: column; align-items:center; justify-content:center; color:#fff;
}
.ph-badge .lab { font-size: 12px; letter-spacing: 2px; opacity: .95; }
.ph-badge .num { font-size: 22px; font-weight: 800; letter-spacing: 1px; margin-top: 2px; }

/* compare — 深色质感卡片（左图 + 右深蓝灰文字区） */
.compare { padding: 70px 0; }
.cmp-list { display: grid; gap: 28px; }
.cmp-row { display: grid; grid-template-columns: 40% 60%; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.cmp-img { position: relative; min-height: 230px; }
.cmp-img img { position:absolute; inset:0; width:100%; height:100%; object-fit: cover; }
.cmp-body {
  padding: 48px 56px; display:flex; flex-direction: column; justify-content:center;
  background: #4a5468 url(../img/cmp-bg-dark.webp) right center / cover no-repeat;
  color: #fff;
}
.cmp-body h3 { font-size: 30px; color: #fff; letter-spacing: 2px; margin-bottom: 26px; font-weight: 700; }
.cmp-body .pt { display:flex; gap: 14px; align-items:flex-start; font-size: 17px; line-height: 1.6; margin-bottom: 16px; color: #fff; }
.cmp-body .pt:last-child { margin-bottom: 0; }
.cmp-body .pt .ic { width: 10px; height: 10px; flex:0 0 10px; border-radius: 50%; margin-top: 9px; }
.cmp-body .pt.good .ic { background: rgba(204,162,85,1); }
.cmp-body .pt.bad { color: rgba(255,255,255,0.62); }
.cmp-body .pt.bad .ic { background: rgba(255,255,255,0.56); }

@media (max-width: 900px){
  .water-hero h1 { font-size: 26px; letter-spacing: 3px; }
  .water-hero p { font-size: 14px; }
  .water-hero .hero-line { height: 2px; }
  .cmp-body h3 { font-size: 22px; margin-bottom: 14px; }
  .cmp-body .pt { font-size: 14px; }
  .geo-grid, .ph-grid { grid-template-columns: 1fr; }
  .geo-visual { justify-content: center; overflow: hidden; }
  .geo-visual .geo-bottle { height: 220px; }
  .geo-visual .geo-section { height: 280px; }
  .geo-info { margin-top: 20px; }
  .cmp-row { grid-template-columns: 1fr; }
  .cmp-img { min-height: 200px; }
  .cmp-body { padding: 36px 32px; }
  .ph-badge { width: 130px; height: 130px; }
  .ph-badge .num { font-size: 30px; }
  .ph-axis { gap: 6px; }
  .ph-axis .arrow-line { width: auto; max-width: 100%; min-width: 0; flex: 1; }
}

/* ============================================================
   BRAND STORY PAGE
   ============================================================ */
.story-hero { background-image: url(../img/feature-stone.jpg); background-image: url(../img/feature-stone.webp); background-size: cover; background-position: center; }
.story-hero::after { background: linear-gradient(90deg, rgba(20,28,44,0.85), rgba(20,28,44,0.35) 60%, rgba(20,28,44,0.6)); }
.story-hero .hero-inner { max-width: 640px; }
.story-hero h1 { font-size: 50px; font-weight: 800; letter-spacing: 4px; line-height: 1.3; }
.story-hero p { margin-top: 24px; font-size: 16px; color: rgba(255,255,255,0.8); line-height: 2; }
.story-hero .btn { margin-top: 32px; }

/* timeline — 横向阶梯式 */
.journey { padding: 70px 0; background: #fff; }
.timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; margin-top: 60px; align-items: end; }
.tl-item { position: relative; padding-bottom: 0; }
/* 阶梯式：从左到右逐级升高 */
.timeline .s1 { margin-bottom: 0; }
.timeline .s2 { margin-bottom: 60px; }
.timeline .s3 { margin-bottom: 120px; }
.timeline .s4 { margin-bottom: 180px; }
.timeline .s5 { margin-bottom: 240px; }
.tl-year {
  display:inline-block; font-size: 17px; font-weight: 600; letter-spacing: 1px; color:#fff;
  background: rgba(102,121,144,0.85); padding: 9px 22px; border-radius: 30px; margin-bottom: 0;
}
/* 竖连接线 + 起点圆点 */
.tl-dot { display:block; width: 1px; height: 70px; margin: 0 0 14px 22px;
  background: linear-gradient(180deg, rgba(102,121,144,0.7), rgba(102,121,144,0)); position: relative; }
.tl-dot::before { content:""; position:absolute; top: -5px; left: -4px; width: 9px; height: 9px; border-radius: 50%; background: rgba(102,121,144,0.9); }
.tl-item h3 { font-size: 20px; letter-spacing: 1px; color: var(--ink); margin-bottom: 10px; font-weight: 700; }
.tl-item p { color: var(--gray-1); font-size: 14px; line-height: 1.7; }

/* brand data — 浅色背景 + 竖分隔线 */
.brand-data { padding: 70px 0; text-align:center; background: #fff; color: var(--ink); }
.bd-grid { display:grid; grid-template-columns: repeat(3,1fr); margin-top: 40px; }
.bd-cell { padding: 10px 24px; position: relative; }
.bd-cell + .bd-cell::before { content:""; position:absolute; left: 0; top: 50%; transform: translateY(-50%); width: 1px; height: 90px; background: var(--line); }
.bd-cell .big { font-size: 48px; font-weight: 800; color: var(--ink); }
.bd-cell .lab { margin-top: 14px; color: var(--gray-1); font-size: 15px; letter-spacing: 1px; }

/* philosophy */
.philosophy { padding: 70px 0; }
.ph-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.ph-grid2 img { width: 100%; border-radius: 10px; box-shadow: var(--shadow); }
.philosophy h3 { font-size: 34px; letter-spacing: 2px; margin: 14px 0 24px; color: var(--ink); }
.philosophy p { color: var(--gray-1); font-size: 16px; margin-bottom: 18px; }

@media (max-width: 900px){
  .story-hero h1 { font-size: 26px; letter-spacing: 2px; }
  .philosophy h3 { font-size: 24px; }
  .bd-cell .big { font-size: 36px; }
  .timeline { grid-template-columns: 1fr; gap: 28px; }
  .timeline .s1, .timeline .s2, .timeline .s3, .timeline .s4, .timeline .s5 { margin-bottom: 0; }
  .tl-dot { height: 40px; }
  .bd-grid { grid-template-columns: 1fr; gap: 8px; }
  .bd-cell + .bd-cell::before { display: none; }
  .ph-grid2 { grid-template-columns: 1fr; }
}

/* ============================================================
   PRODUCT PAGE
   ============================================================ */
.product-hero { background: linear-gradient(160deg,#eef2f6 0%, #dde6ee 100%); color: var(--ink); min-height: 100vh; }
.product-hero::after { display:none; }
.ph-inner { display:grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items:center; width:100%; }
.ph-copy .eyebrow { display:block; }
.ph-copy h1 { font-size: 44px; font-weight: 800; letter-spacing: 3px; line-height:1.3; margin: 16px 0 18px; color: var(--navy); }
.ph-copy .lead { color: var(--gray-1); font-size: 16px; margin-bottom: 34px; }
.spec-row { display:flex; gap: 0; margin-bottom: 36px; }
.spec-row .sp { flex:1; text-align:center; }
.spec-row .sp + .sp { border-left: 1px solid var(--line); }
.spec-row .sp .v { font-size: 30px; font-weight: 800; color: var(--blue-deep); }
.spec-row .sp .k { font-size: 14px; color: var(--gray-2); margin-top: 4px; letter-spacing:1px; }
.ph-bottles { display:flex; justify-content:center; gap: 18px; }
.ph-bottles img { height: 560px; width:auto; filter: drop-shadow(0 30px 40px rgba(31,49,71,0.18)); }
.ph-bottles img:last-child { margin-top: 50px; height: 480px; }

/* minerals — 还原设计稿：浅蓝渐变卡 + 顶部深色异形标签块 */
.minerals { padding: 70px 0; }
.min-grid { display:grid; grid-template-columns: repeat(4,1fr); gap: 28px; margin-top: 140px; }
.min-card {
  position: relative; text-align:center; transition: var(--t);
  padding: 78px 24px 44px;
  border-radius: 16px;
  background: linear-gradient(180deg, #dbe7f3 0%, #eef4fa 34%, #ffffff 100%);
  box-shadow: var(--shadow-sm);
}
.min-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }
/* 浅蓝药丸：满宽横条，中线压在卡片顶边上，下半覆盖卡片顶部 */
.min-card::before {
  content:""; position: absolute; top: -35px; left: 0; right: 0;
  height: 70px; border-radius: 70px;
  background: linear-gradient(270deg, #D5E4EF 0%, #ABC4DB 100%);
  z-index: 1;
}
/* 深色标签块：比药丸更高、顶部圆角、底部直角，底部与药丸底部对齐 */
.min-card .min-tag {
  position: absolute; top: -75px; left: 50%; transform: translateX(-50%); z-index: 2;
  width: 70%; height: 110px; padding: 0 10px;
  background: var(--navy);
  border-radius: 40px 40px 0 0;
  display:flex; flex-direction: column; align-items:center; justify-content:center; gap: 4px;
  box-shadow: 0 14px 26px rgba(31,49,71,.22);
}
.min-card .min-tag .name { font-size: 23px; font-weight: 700; letter-spacing: 1px; color: #fff; line-height: 1.2; }
.min-card .min-tag .formula { font-size: 19px; font-weight: 600; letter-spacing: 1px; color: rgba(255,255,255,0.9); }
.min-card .min-desc { font-size: 15px; color: var(--gray-1); line-height: 1.9; margin: 0; }

/* differentiation */
.diff { padding: 70px 0; background: var(--bg-soft); }
.diff-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.diff-card { position: relative; border-radius: 18px; overflow: hidden; min-height: 260px; display:flex; align-items:flex-end; color:#fff; box-shadow: var(--shadow-sm); }
.diff-card img { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; transition: transform .6s ease; }
.diff-card:hover img { transform: scale(1.05); }
.diff-card .ov { position:relative; z-index:2; padding: 32px; width:100%; background: linear-gradient(180deg, transparent, rgba(20,28,44,0.82)); }
.diff-card h3 { font-size: 22px; letter-spacing:1px; margin-bottom: 6px; }
.diff-card p { font-size: 14px; color: rgba(255,255,255,0.85); }

@media (max-width: 900px){
  .product-hero .wrap { padding-top: 96px; }
  .ph-copy h1 { font-size: 28px; letter-spacing: 2px; }
  .spec-row .sp .v { font-size: 22px; }
  .ph-inner { grid-template-columns: 1fr; }
  .ph-bottles { margin-bottom: 40px; }
  .ph-bottles img { height: 360px; }
  .ph-bottles img:last-child { height: 320px; margin-top: 30px; }
  .min-grid { grid-template-columns: 1fr 1fr; margin-top: 80px; row-gap: 80px; column-gap: 16px; }
  .diff-grid { grid-template-columns: 1fr; }
}

/* 移动端留白统一收紧（放在最后确保不被覆盖） */
@media (max-width: 900px) {
  .sec-head { margin-bottom: 28px; }
  .cs-text .cs-line { margin: 6px 0 24px; }
  .cs-grid .cs-pics { margin-top: 12px; }
  .deep-feature { padding: 0 0 24px; }
  .ph-note { margin-top: 16px; }
  .ph-axis { margin-bottom: 16px; }
  .cta-band h2 { margin-bottom: 20px; }
  .cold-spring, .real-deep, .crowd, .geology, .ph-sec, .compare, .journey, .brand-data, .philosophy, .minerals, .diff { padding: 36px 0; }
  .cta-band { padding: 60px 0; }
  .geo-info h3 { font-size: 16px; text-align: left; padding-right: 0; }
  .min-card { padding: 56px 14px 28px; }
  .min-card .min-tag { top: -55px; height: 85px; width: 80%; }
  .min-card::before { top: -25px; height: 55px; }
  .min-card .min-tag .name { font-size: 15px; }
  .min-card .min-tag .formula { font-size: 12px; }
  .min-card .min-desc { font-size: 12px; line-height: 1.6; }
  .ph-badge .num { font-size: 20px; }
  .brand .logo { height: 24px; }
  .brand .logo img { height: 24px; }
  .footer-brand .logo { height: 28px; }
}