/* ============================================================
   天津云研科技有限公司 YOOLN 官网样式
   设计语言：Apple 官网风格 —— 极简 · 大字 · 留白 · 黑白灰
   ============================================================ */

:root {
  --black: #232a22;
  --gray: #66705f;
  --gray-light: #8a9186;
  --bg: #ffffff;
  --bg-gray: #f2f5f0;
  --dark: #1e2a22;
  --dark-card: #2a382e;
  --border: #d8dcd2;
  --blue: #4c6a50;
  --blue-link: #3d6b47;
  --blue-hover: #5b7d5f;
  --radius-lg: 30px;
  --radius-md: 18px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC",
    "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--black);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.03em;
}

h1, h2, h3, h4 {
  color: var(--black);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.35;
}

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

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航（磨砂玻璃） ---------- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: var(--transition);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1080px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 27px;
  font-weight: 600;
  line-height: 1;
  color: var(--black);
  letter-spacing: 0.04em;
}
.logo img { height: 50px; width: auto; display: block; }

/* Hero 大 LOGO */
.hero-logo { margin-bottom: 40px; }
.hero-logo img {
  height: 150px;
  width: auto;
  margin: 0 auto;
  display: block;
  filter: drop-shadow(0 10px 28px rgba(76, 106, 80, 0.28));
}

.logo small {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--gray);
  text-transform: uppercase;
  line-height: 1;
  align-self: center;
}

.nav { display: flex; gap: 28px; }
.nav a {
  font-size: 16px;
  font-weight: 500;
  color: rgba(0, 0, 0, 0.82);
  padding: 10px 20px;
  border-radius: 10px;
  transition: var(--transition);
}
.nav a:hover { color: var(--blue-link); background: rgba(0, 0, 0, 0.05); }
.nav a.active { color: var(--black); font-weight: 500; background: rgba(76, 106, 80, 0.1); }

.menu-btn {
  display: none;
  background: none; border: none;
  font-size: 22px; cursor: pointer;
  color: var(--black);
}

/* ---------- 通用区块 ---------- */
.section { padding: 128px 0; }
.section.alt { background: var(--bg-gray); }
.section.dark { background: var(--dark); color: var(--gray-light); }
.section.dark h1, .section.dark h2, .section.dark h3, .section.dark h4 { color: #f2f5f0; }

.sec-head { max-width: 760px; margin-bottom: 76px; }
.sec-head.center { margin: 0 auto 76px; text-align: center; }
.sec-tag {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--blue-link);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section.dark .sec-tag { color: #8fb996; }
.sec-head h2 {
  font-size: clamp(32px, 4.6vw, 52px);
  font-weight: 600;
  margin-bottom: 16px;
}
.sec-head p { color: var(--gray); font-size: 19px; line-height: 1.75; }
.section.dark .sec-head p { color: var(--gray-light); }

/* 按钮与链接 —— Apple 胶囊按钮 + 蓝色 chevron 链接 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 13px 26px;
  border-radius: 980px;
  font-size: 16px;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-hover); }
.btn-outline {
  background: transparent;
  color: var(--blue-link);
  border: 1px solid var(--blue-link);
}
.btn-outline:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-dark { background: #f2f5f0; color: var(--black); }
.btn-dark:hover { background: #e8e8ed; }

.link-more {
  color: var(--blue-link);
  font-size: 17px;
  font-weight: 400;
  transition: var(--transition);
}
.link-more::after { content: " ›"; font-weight: 600; }
.link-more:hover { text-decoration: underline; }
.section.dark .link-more { color: #8fb996; }

/* ---------- 首页 Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--bg-gray);
  padding: 140px 0 90px;
}
.hero-content { max-width: 860px; margin: 0 auto; }
.hero-eyebrow {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gray);
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(48px, 7.5vw, 88px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.35;
  margin-bottom: 22px;
}
.hero h1 span {
  background: linear-gradient(90deg, #4c6a50, #7a9a7e);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .hero-sub {
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 500;
  color: var(--black);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.hero-en {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.42em;
  color: var(--gray-light);
  text-transform: uppercase;
  margin-bottom: 30px;
}
.hero p.lead {
  font-size: 19px;
  color: var(--gray);
  max-width: 700px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  gap: 28px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-top: 90px;
}
.hero-stat { padding: 0 44px; }
.hero-stat + .hero-stat { border-left: 1px solid var(--border); }
.hero-stat .num {
  font-size: 34px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--black);
}
.hero-stat .lbl {
  font-size: 13px;
  color: var(--gray);
  margin-top: 4px;
  line-height: 1.4;
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* 深色板块中的卡片 */
.section.dark .card { background: var(--dark-card); }
.section.dark .card:hover { box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45); }
.section.dark .card h3 { color: #f2f5f0; }
.section.dark .card p { color: var(--gray-light); }
.section.dark .card .icon { background: #f2f5f0; }
.section.dark .card .icon svg { stroke: var(--black); }

.card {
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  transition: var(--transition);
}
.section.alt .card { background: var(--bg); }
.card:hover { box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08); }
.card .icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--black);
  display: grid;
  place-items: center;
  margin-bottom: 26px;
}
.card .icon svg { width: 25px; height: 25px; stroke: #fff; }
.card h3 { font-size: 21px; margin-bottom: 10px; letter-spacing: 0.04em; }
.card p { font-size: 15px; color: var(--gray); line-height: 1.85; }

/* ---------- 关于预览（首页） ---------- */
.about-preview .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/4.4;
  background: linear-gradient(160deg, #33402f 0%, #1e2a22 100%);
  display: grid;
  place-items: center;
  position: relative;
}
.about-visual .big {
  font-size: clamp(60px, 7vw, 96px);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.14);
  writing-mode: vertical-rl;
}
.about-visual .badge {
  position: absolute;
  bottom: 28px; left: 28px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  padding: 16px 22px;
  color: #f2f5f0;
}
.about-visual .badge .num { font-size: 17px; font-weight: 600; }
.about-visual .badge .lbl { font-size: 12px; color: rgba(255,255,255,0.6); margin-top: 2px; }

.about-text h2 {
  font-size: clamp(30px, 3.6vw, 44px);
  margin: 12px 0 22px;
}
.about-text p { color: var(--gray); font-size: 17px; margin-bottom: 16px; }
.about-points { margin: 28px 0 36px; display: grid; gap: 14px; }
.about-points li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15.5px;
  color: var(--black);
}
.about-points li .dot {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 11px;
  flex-shrink: 0;
  margin-top: 3px;
}

/* ---------- 价值 / 理念 ---------- */
.value-item { text-align: center; padding: 16px 20px; }
.value-item .vnum {
  width: 72px; height: 72px;
  margin: 0 auto 22px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 30px;
  font-weight: 600;
  background: var(--bg-gray);
  color: var(--black);
}
.section.dark .value-item .vnum {
  background: var(--dark-card);
  color: #f2f5f0;
}
.value-item h3 { font-size: 21px; margin-bottom: 10px; }
.value-item p { font-size: 15px; color: var(--gray); line-height: 1.85; }
.section.dark .value-item p { color: var(--gray-light); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  padding: 90px 60px;
  text-align: center;
}
.cta-band h2 {
  font-size: clamp(30px, 4vw, 46px);
  margin-bottom: 18px;
}
.cta-band p {
  color: var(--gray);
  font-size: 18px;
  max-width: 560px;
  margin: 0 auto 36px;
}

/* ---------- 页头（内页） ---------- */
.page-hero {
  padding: 160px 0 80px;
  background: var(--bg-gray);
  text-align: center;
}
.page-hero .crumb {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 24px;
}
.page-hero .crumb a:hover { color: var(--blue-link); }
.ph-en {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.32em;
  color: var(--gray-light);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.page-hero h1 {
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 18px;
}
.page-hero p {
  max-width: 620px;
  margin: 0 auto;
  color: var(--gray);
  font-size: 19px;
}

/* ---------- 关于我们页 ---------- */
.intro-split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 72px;
  align-items: start;
}
.intro-split .lead-text {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.45;
  color: var(--black);
  margin-bottom: 28px;
}
.intro-split p { color: var(--gray); font-size: 16.5px; margin-bottom: 16px; }
.intro-split p strong { color: var(--black); font-weight: 600; }

.info-panel {
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  padding: 38px 34px;
  position: sticky;
  top: 80px;
}
.info-panel h3 {
  font-size: 20px;
  padding-bottom: 16px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.info-panel .row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  font-size: 14px;
}
.info-panel .row:last-child { border-bottom: none; }
.info-panel dt { color: var(--gray); }
.info-panel dd { color: var(--black); font-weight: 500; }

/* 时间线 */
.timeline { position: relative; max-width: 680px; margin: 0 auto; padding-left: 36px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 8px; bottom: 8px;
  width: 2px;
  background: var(--border);
}
.t-item { position: relative; padding-bottom: 44px; }
.t-item:last-child { padding-bottom: 0; }
.t-item::before {
  content: "";
  position: absolute;
  left: -34px; top: 8px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--blue);
}
.t-item .t-date {
  font-size: 14px;
  font-weight: 600;
  color: var(--blue-link);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.t-item h3 { font-size: 20px; margin-bottom: 8px; }
.t-item p { font-size: 15px; color: var(--gray); max-width: 540px; }

/* 理念卡片 */
.philosophy-card {
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  padding: 48px 36px;
  text-align: center;
  transition: var(--transition);
}
.section.alt .philosophy-card { background: var(--bg); }
.section.dark .philosophy-card { background: var(--dark-card); }
.philosophy-card:hover { box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08); }
.philosophy-card .glyph {
  font-size: 30px;
  font-weight: 600;
  color: #fff;
  width: 76px; height: 76px;
  border-radius: 50%;
  background: var(--black);
  display: grid;
  place-items: center;
  margin: 0 auto 24px;
}
.philosophy-card h3 { font-size: 21px; margin-bottom: 12px; }
.philosophy-card p { font-size: 15px; color: var(--gray); line-height: 1.85; }
.section.dark .philosophy-card p { color: var(--gray-light); }
.section.dark .philosophy-card .glyph { background: #f2f5f0; color: var(--black); }

/* ---------- 产品服务页 ---------- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
  padding: 64px 0;
}
.service-block + .service-block { border-top: 1px solid var(--border); }
.service-block:nth-child(even) .s-text { order: 2; }
.s-visual {
  border-radius: var(--radius-lg);
  aspect-ratio: 16/10.5;
  display: grid;
  place-items: center;
  background: var(--bg-gray);
}
.s-visual.dark-tile { background: linear-gradient(160deg, #33402f, #1e2a22); }
.s-visual .glyph {
  font-size: clamp(80px, 9vw, 120px);
  font-weight: 700;
  color: rgba(0, 0, 0, 0.08);
}
.s-visual.dark-tile .glyph { color: rgba(255, 255, 255, 0.14); }
.s-text .s-no {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--blue-link);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.s-text h3 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 14px; }
.s-text > p { color: var(--gray); font-size: 16.5px; margin-bottom: 22px; }
.s-text > p strong { color: var(--black); font-weight: 600; }
.s-list { display: grid; gap: 10px; }
.s-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 15.5px;
  color: var(--black);
}
.s-list li::before {
  content: "›";
  color: var(--blue-link);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
}

/* 服务流程 */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.flow-item {
  text-align: center;
  padding: 36px 22px;
  background: var(--bg);
  border-radius: var(--radius-lg);
}
.flow-item .f-no {
  width: 60px; height: 60px;
  border-radius: 50%;
  background: var(--black);
  color: #fff;
  font-size: 22px;
  font-weight: 600;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
}
.flow-item h3 { font-size: 18px; margin-bottom: 8px; }
.flow-item p { font-size: 14px; color: var(--gray); line-height: 1.55; }

/* ---------- 联系我们页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: start;
}
.contact-item {
  display: flex;
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:first-child { padding-top: 4px; }
.contact-item:last-child { border-bottom: none; }
.contact-item .c-icon {
  width: 48px; height: 48px;
  border-radius: 14px;
  background: var(--bg-gray);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.contact-item .c-icon svg { width: 22px; height: 22px; stroke: var(--black); }
.contact-item h3 { font-size: 17px; margin-bottom: 5px; }
.contact-item p { font-size: 14.5px; color: var(--gray); }
.contact-item p strong { color: var(--black); font-weight: 600; }

.form-card {
  background: var(--bg-gray);
  border-radius: var(--radius-lg);
  padding: 48px 42px;
}
.form-card h2 { font-size: 26px; margin-bottom: 6px; }
.form-card > p { color: var(--gray); font-size: 15px; margin-bottom: 30px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray);
  margin-bottom: 7px;
}
.form-group label em { color: #e30000; font-style: normal; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 15.5px;
  font-family: inherit;
  background: var(--bg);
  transition: var(--transition);
  color: var(--black);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(76, 106, 80, 0.18);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-msg { font-size: 14px; margin-top: 14px; display: none; }
.form-msg.ok { display: block; color: #008a2e; }

/* 地图占位 */
.map-box {
  margin-top: 80px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 360px;
  background:
    linear-gradient(rgba(0,0,0,0.55), rgba(0,0,0,0.72)),
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(255,255,255,0.08) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(255,255,255,0.08) 40px),
    #232a22;
  display: grid;
  place-items: center;
  text-align: center;
  color: #f2f5f0;
}
.map-box .pin {
  width: 48px; height: 48px;
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  background: var(--blue);
  margin: 0 auto 18px;
  display: grid;
  place-items: center;
  box-shadow: 0 0 0 10px rgba(76, 106, 80, 0.28);
}
.map-box .pin::after {
  content: "";
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
}
.map-box h3 { color: #f2f5f0; font-size: 21px; margin-bottom: 6px; }
.map-box p { color: rgba(255,255,255,0.65); font-size: 14.5px; }

/* ---------- 页脚（Apple 式小字法律区） ---------- */
.footer {
  background: var(--bg-gray);
  color: var(--gray);
  padding: 40px 0 32px;
  font-size: 12px;
}
.footer .container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 44px;
  padding-bottom: 28px;
}
.footer h4 {
  color: var(--black);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.footer .f-logo {
  font-size: 18px;
  font-weight: 600;
  line-height: 1;
  color: var(--black);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer .f-logo img { height: 26px; width: auto; display: block; }
.footer .f-logo .en-brand { align-self: center; }
.footer .f-logo .en-brand {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--gray-light);
  font-weight: 600;
}
.footer p, .footer li { font-size: 12px; line-height: 1.7; }
.footer li { margin-bottom: 8px; }
.footer a { color: var(--gray); }
.footer a:hover { color: var(--blue-link); text-decoration: underline; }
.footer .bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  color: var(--gray-light);
}
.footer .bottom .container {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 0;
  grid-template-columns: none;
}

/* ---------- 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
  .about-preview .container,
  .intro-split,
  .service-block,
  .contact-grid { grid-template-columns: 1fr; }
  .service-block:nth-child(even) .s-text { order: 0; }
  .info-panel { position: static; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .footer .container { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .sec-head h2 { font-size: 32px; }
  .hero { padding: 120px 0 64px; }
  .hero-stats { flex-wrap: wrap; gap: 28px 0; }
  .hero-stat { flex: 1 1 42%; padding: 0 18px; }
  .hero-stat + .hero-stat { border-left: none; }
  .page-hero { padding: 120px 0 56px; }
  .grid.cols-3, .grid.cols-4, .grid.cols-2 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .cta-band { padding: 60px 28px; }
  .footer .container { grid-template-columns: 1fr; gap: 28px; }
  .nav {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    padding: 8px 0 16px;
    border-bottom: 1px solid var(--border);
  }
  .nav.open { display: flex; }
  .nav a { padding: 13px 24px; font-size: 15px; }
  .menu-btn { display: block; }
  .form-card { padding: 34px 24px; }
}

/* ============================================================
   质感增强层：渐变 · 层次阴影 · 描边高光 · 氛围光
   ============================================================ */

/* Hero：柔和的绿色氛围光 */
.hero {
  background:
    radial-gradient(720px 380px at 18% 0%, rgba(76, 106, 80, 0.10), transparent 65%),
    radial-gradient(680px 420px at 88% 18%, rgba(122, 154, 126, 0.12), transparent 65%),
    radial-gradient(900px 500px at 50% 108%, rgba(76, 106, 80, 0.08), transparent 60%),
    var(--bg-gray);
}

/* 浅色卡片：细腻渐变 + 描边 + 双层阴影 */
.card {
  background: linear-gradient(165deg, #f8faf6 0%, #edf1e9 100%);
  border: 1px solid rgba(35, 42, 34, 0.07);
  box-shadow:
    0 1px 2px rgba(35, 42, 34, 0.04),
    0 10px 28px rgba(35, 42, 34, 0.05);
}
.section.alt .card {
  background: linear-gradient(165deg, #ffffff 0%, #f4f7f1 100%);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 2px 4px rgba(35, 42, 34, 0.05),
    0 18px 44px rgba(35, 42, 34, 0.10);
}
.card .icon {
  background: linear-gradient(150deg, #2b362c, #1e2a22);
  box-shadow:
    0 6px 16px rgba(30, 42, 34, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

/* 深色板块：氛围光 + 卡片立体化 */
.section.dark {
  background:
    radial-gradient(800px 400px at 80% 0%, rgba(143, 185, 150, 0.10), transparent 60%),
    radial-gradient(700px 420px at 8% 100%, rgba(76, 106, 80, 0.14), transparent 60%),
    var(--dark);
}
.section.dark .card {
  background: linear-gradient(165deg, #2f3d33 0%, #263329 100%);
  border: 1px solid rgba(255, 255, 255, 0.09);
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.3),
    0 12px 32px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.section.dark .card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.35),
    0 22px 50px rgba(0, 0, 0, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
.section.dark .card .icon {
  background: linear-gradient(150deg, #f8faf6, #dfe7da);
  box-shadow:
    0 6px 16px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

/* 理念卡片：与卡片统一的立体质感 */
.philosophy-card {
  background: linear-gradient(165deg, #f8faf6 0%, #edf1e9 100%);
  border: 1px solid rgba(35, 42, 34, 0.07);
  box-shadow:
    0 1px 2px rgba(35, 42, 34, 0.04),
    0 10px 28px rgba(35, 42, 34, 0.05);
}
.section.alt .philosophy-card {
  background: linear-gradient(165deg, #ffffff 0%, #f4f7f1 100%);
}
.philosophy-card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 2px 4px rgba(35, 42, 34, 0.05),
    0 18px 44px rgba(35, 42, 34, 0.10);
}
.philosophy-card .glyph {
  background: linear-gradient(150deg, #2b362c, #1e2a22);
  box-shadow:
    0 8px 20px rgba(30, 42, 34, 0.30),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}
.section.dark .philosophy-card {
  background: linear-gradient(165deg, #2f3d33 0%, #263329 100%);
  border: 1px solid rgba(255, 255, 255, 0.09);
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.3),
    0 12px 32px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.section.dark .philosophy-card .glyph {
  background: linear-gradient(150deg, #f8faf6, #dfe7da);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

/* 价值圆形序号：渐变 + 投影 */
.value-item .vnum {
  background: linear-gradient(160deg, #f8faf6, #e6ece1);
  border: 1px solid rgba(35, 42, 34, 0.08);
  box-shadow:
    0 6px 16px rgba(35, 42, 34, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}
.section.alt .value-item .vnum { background: linear-gradient(160deg, #ffffff, #eef2ea); }
.section.dark .value-item .vnum {
  background: linear-gradient(160deg, #33423a, #263329);
  border: 1px solid rgba(255, 255, 255, 0.10);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.35);
}

/* 主按钮：渐变 + 投影 + 悬浮上浮 */
.btn-primary {
  background: linear-gradient(160deg, #5b7d5f, #4c6a50);
  box-shadow: 0 6px 18px rgba(76, 106, 80, 0.35);
}
.btn-primary:hover {
  background: linear-gradient(160deg, #648968, #54715a);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(76, 106, 80, 0.42);
}

/* CTA 横幅：渐变 + 描边 + 阴影 */
.cta-band {
  background:
    radial-gradient(600px 300px at 50% 0%, rgba(76, 106, 80, 0.10), transparent 60%),
    linear-gradient(165deg, #f6f9f3, #eaf0e5);
  border: 1px solid rgba(35, 42, 34, 0.07);
  box-shadow:
    0 1px 2px rgba(35, 42, 34, 0.04),
    0 16px 44px rgba(35, 42, 34, 0.07);
}

/* 服务页图块：渐变 + 内阴影 + 描边 */
.s-visual {
  background: linear-gradient(160deg, #eef2ea 0%, #dfe7da 100%);
  border: 1px solid rgba(35, 42, 34, 0.07);
  box-shadow:
    0 14px 36px rgba(35, 42, 34, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}
.s-visual .glyph { color: rgba(35, 42, 34, 0.12); }
.s-visual.dark-tile {
  background:
    radial-gradient(420px 240px at 80% 0%, rgba(143, 185, 150, 0.14), transparent 60%),
    linear-gradient(160deg, #33402f, #1e2a22);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 14px 36px rgba(30, 42, 34, 0.30),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

/* 信息面板 / 表单卡 / 流程卡：描边 + 层次阴影 */
.info-panel, .form-card {
  background: linear-gradient(170deg, #f8faf6, #eff3ec);
  border: 1px solid rgba(35, 42, 34, 0.07);
  box-shadow:
    0 1px 2px rgba(35, 42, 34, 0.04),
    0 12px 34px rgba(35, 42, 34, 0.06);
}
.flow-item {
  background: linear-gradient(170deg, #ffffff, #f4f7f1);
  border: 1px solid rgba(35, 42, 34, 0.07);
  box-shadow:
    0 1px 2px rgba(35, 42, 34, 0.04),
    0 8px 24px rgba(35, 42, 34, 0.05);
}
.flow-item .f-no {
  background: linear-gradient(150deg, #2b362c, #1e2a22);
  box-shadow:
    0 6px 16px rgba(30, 42, 34, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

/* 关于页黑色视觉块：氛围光 + 投影 */
.about-visual {
  background:
    radial-gradient(420px 300px at 80% 0%, rgba(143, 185, 150, 0.16), transparent 60%),
    linear-gradient(160deg, #33402f 0%, #1e2a22 100%);
  box-shadow:
    0 2px 6px rgba(30, 42, 34, 0.18),
    0 24px 56px rgba(30, 42, 34, 0.24);
}

/* Hero 数据区：加上下分隔线，增强结构感 */
.hero-stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 34px 0;
}
.hero-stat { padding: 0 44px; }

/* 区块之间细分隔线，增加层次 */
.section + .section:not(.alt):not(.dark) { border-top: 1px solid rgba(35, 42, 34, 0.06); }

/* 时间线节点：发光点 */
.t-item::before {
  box-shadow: 0 0 0 4px rgba(76, 106, 80, 0.15);
}