/* ==========================================================
   镭灿集团 LEICAN GROUP — 视觉系统 v2
   基调：白底开阔 + 藏青主色 + 铜金点缀（集团大气路线）
   ========================================================== */

:root {
  --navy: #0b2c4d;          /* 主色：藏青 */
  --navy-2: #14507f;        /* 辅助蓝 */
  --navy-deep: #08203a;     /* 页脚 */
  --ink: #16232f;           /* 正文深色 */
  --ink-soft: #3d4d5c;
  --muted: #64757f;
  --line: rgba(11, 44, 77, 0.12);
  --line-strong: rgba(11, 44, 77, 0.26);
  --paper: #ffffff;
  --soft: #f5f7f9;
  --soft-2: #eef2f6;
  --gold: #a98246;
  --gold-soft: #c9a878;

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC",
    "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, monospace;

  --w: 1400px;
  --pad: 56px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.75;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
::selection { background: var(--navy); color: #fff; }

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

/* ---------- 章节 ---------- */
.section { padding: 168px 0; position: relative; }
.section--soft { background: var(--soft); }
.section--navy { background: var(--navy); color: #eaf0f6; }
.section--tight { padding: 120px 0; }

.eyebrow {
  display: flex; align-items: center; gap: 16px;
  font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--muted); font-weight: 500; margin-bottom: 48px;
}
.eyebrow::after { content: ""; height: 1px; flex: 1; background: var(--line); max-width: 140px; }
.eyebrow b { color: var(--gold); font-weight: 700; letter-spacing: 0.1em; font-family: var(--mono); }
.section--navy .eyebrow { color: rgba(234, 240, 246, 0.55); }
.section--navy .eyebrow::after { background: rgba(234, 240, 246, 0.2); }
.section--navy .eyebrow b { color: var(--gold-soft); }

/* 标题 */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.14; letter-spacing: -0.015em; color: var(--navy); }
.section--navy h1, .section--navy h2, .section--navy h3, .section--navy h4 { color: #fff; }

.h-display {
  font-size: clamp(50px, 7.2vw, 120px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.h-section {
  font-size: clamp(34px, 4vw, 62px);
  line-height: 1.16;
  letter-spacing: -0.022em;
}
.h-card { font-size: 22px; line-height: 1.4; }
.lead {
  font-size: clamp(16.5px, 1.2vw, 18.5px);
  line-height: 1.9;
  color: var(--ink-soft);
  font-weight: 400;
}
.section--navy .lead { color: rgba(234, 240, 246, 0.78); }
.muted { color: var(--muted); }

/* ---------- 进度线 ---------- */
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--gold); z-index: 999; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s, box-shadow 0.4s;
}
.nav--scrolled { border-bottom-color: var(--line); box-shadow: 0 1px 24px rgba(11, 44, 77, 0.05); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 86px; }

.brand { display: flex; align-items: center; gap: 13px; }
.brand__mark { width: 30px; height: 30px; flex: none; color: var(--navy); }
.brand__mark svg { width: 100%; height: 100%; display: block; }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__cn { font-size: 16.5px; font-weight: 700; letter-spacing: 0.18em; color: var(--navy); }
.brand__en { font-size: 9px; letter-spacing: 0.32em; color: var(--muted); margin-top: 4px; }

.nav__menu { display: flex; align-items: center; gap: 42px; }
.nav__menu a {
  font-size: 14.5px; color: var(--ink-soft); letter-spacing: 0.02em;
  position: relative; padding: 5px 0; transition: color 0.3s;
}
.nav__menu a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--gold); transition: width 0.4s var(--ease);
}
.nav__menu a:hover { color: var(--navy); }
.nav__menu a:hover::after { width: 100%; }

.nav__cta {
  font-size: 13.5px; letter-spacing: 0.08em; padding: 11px 26px;
  background: var(--navy); color: #fff; border-radius: 2px;
  transition: all 0.35s var(--ease);
}
.nav__cta:hover { background: var(--navy-2); transform: translateY(-1px); }
.nav__burger { display: none; background: none; border: none; cursor: pointer; color: var(--navy); }

/* ---------- 首屏（白底 + 藏青字 + 抽象天际线） ---------- */
.hero {
  position: relative; background: linear-gradient(180deg, #fbfcfd 0%, #f2f6fa 62%, #eaf0f6 100%);
  padding-top: 158px; padding-bottom: 0; overflow: hidden;
  min-height: 100vh; display: flex; flex-direction: column; justify-content: space-between;
}
.hero__bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.hero__glow {
  position: absolute; width: 1000px; height: 1000px; border-radius: 50%;
  right: -300px; top: -320px;
  background: radial-gradient(circle, rgba(20, 80, 127, 0.10) 0%, rgba(20, 80, 127, 0.03) 45%, transparent 70%);
}
.hero__glow2 {
  position: absolute; width: 620px; height: 620px; border-radius: 50%;
  left: -220px; bottom: -180px;
  background: radial-gradient(circle, rgba(169, 130, 70, 0.10) 0%, transparent 68%);
}
.hero__skyline {
  position: absolute; right: 0; bottom: 118px; width: 58%; max-width: 900px;
  opacity: 0.9;
}
.hero__skyline svg { width: 100%; height: auto; display: block; }

.hero__body { position: relative; z-index: 2; padding-bottom: 88px; }

.hero__top {
  display: flex; align-items: center; gap: 18px; margin-bottom: 52px;
  font-size: 12px; letter-spacing: 0.26em; text-transform: uppercase;
  color: var(--muted);
}
.hero__top .dot { width: 6px; height: 6px; background: var(--gold); flex: none; }
.hero__top .rule { height: 1px; width: 80px; background: var(--line-strong); }

.hero h1 { max-width: 17em; color: var(--navy); }
.hero h1 em { font-style: normal; display: block; color: var(--navy-2); }

.hero__sub {
  margin-top: 40px; max-width: 44ch;
  font-size: clamp(16px, 1.2vw, 18.5px); line-height: 1.95;
  color: var(--ink-soft);
}

.hero__actions { display: flex; align-items: center; gap: 16px; margin-top: 54px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 17px 36px; font-size: 14.5px; letter-spacing: 0.05em;
  border: 1px solid transparent; border-radius: 2px;
  transition: all 0.4s var(--ease); cursor: pointer; background: none; font-family: inherit;
}
.btn--solid { background: var(--navy); color: #fff; }
.btn--solid:hover { background: var(--navy-2); transform: translateY(-2px); box-shadow: 0 14px 32px -14px rgba(11,44,77,0.5); }
.btn--ghost { color: var(--navy); border-color: var(--line-strong); }
.btn--ghost:hover { background: var(--navy); color: #fff; border-color: var(--navy); }
.btn .arrow { transition: transform 0.4s var(--ease); }
.btn:hover .arrow { transform: translateX(5px); }

/* 首屏底部藏青数据带 */
.hero__band {
  position: relative; z-index: 3; background: var(--navy); color: #fff;
  padding: 46px 0 48px;
}
.hero__facts { display: grid; grid-template-columns: repeat(4, 1fr); }
.hero__fact { padding-right: 28px; }
.hero__fact + .hero__fact { padding-left: 40px; border-left: 1px solid rgba(255, 255, 255, 0.16); }
.hero__fact dt {
  font-size: 11.5px; letter-spacing: 0.22em; text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5); margin-bottom: 14px;
}
.hero__fact dd {
  font-size: 40px; font-weight: 700; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums; line-height: 1; color: #fff;
}
.hero__fact dd small {
  display: block; font-size: 13.5px; font-weight: 400;
  color: rgba(255, 255, 255, 0.62); margin-top: 12px; letter-spacing: 0.02em;
}

/* ---------- 集团理念 ---------- */
.belief { display: grid; grid-template-columns: 1fr 1fr; gap: 110px; align-items: start; }
.belief__quote {
  font-size: clamp(30px, 3.1vw, 46px); line-height: 1.5;
  letter-spacing: -0.018em; font-weight: 700; color: var(--navy);
}
.belief__quote span { color: var(--gold); }
.belief__body p + p { margin-top: 24px; }
.belief__sign {
  margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--line);
  display: flex; align-items: center; gap: 18px;
  font-size: 13.5px; letter-spacing: 0.04em; color: var(--muted);
}
.belief__sign b { color: var(--navy); font-weight: 700; }

/* ---------- 业务 ---------- */
.biz__head { display: flex; justify-content: space-between; align-items: flex-end; gap: 80px; margin-bottom: 84px; }
.biz__head .lead { max-width: 32ch; }

.biz__list { border-top: 1px solid var(--line-strong); }
.biz__item {
  display: grid; grid-template-columns: 100px 1.1fr 1.5fr 64px;
  align-items: center; gap: 36px;
  padding: 44px 0; border-bottom: 1px solid var(--line);
  position: relative; transition: padding 0.5s var(--ease), background 0.5s;
}
.biz__item::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 0;
  background: var(--navy); transition: width 0.5s var(--ease);
}
.biz__item:hover::before { width: 3px; }
.biz__item:hover { padding-left: 26px; background: linear-gradient(90deg, rgba(11,44,77,0.025), transparent 45%); }
.biz__no {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.16em;
  color: var(--gold); font-variant-numeric: tabular-nums; font-weight: 600;
}
.biz__name { font-size: clamp(22px, 2.1vw, 30px); font-weight: 700; color: var(--navy); letter-spacing: -0.01em; }
.biz__desc { font-size: 15px; line-height: 1.85; color: var(--muted); }
.biz__go {
  justify-self: end; width: 46px; height: 46px; border: 1px solid var(--line-strong);
  border-radius: 50%; display: grid; place-items: center; color: var(--navy);
  transition: all 0.45s var(--ease);
}
.biz__item:hover .biz__go { background: var(--navy); border-color: var(--navy); color: #fff; transform: rotate(-45deg); }

/* ---------- 集团架构 ---------- */
.org { margin-top: 76px; }
.org__root {
  border: 1px solid rgba(255, 255, 255, 0.24);
  padding: 42px 48px; display: flex; align-items: center; justify-content: space-between;
  gap: 40px; background: rgba(255, 255, 255, 0.05);
}
.org__label { font-size: 11.5px; letter-spacing: 0.24em; color: rgba(255,255,255,0.5); text-transform: uppercase; margin-bottom: 14px; }
.org__title { font-size: 27px; font-weight: 700; letter-spacing: 0.005em; color: #fff; }
.org__en { font-size: 11.5px; letter-spacing: 0.22em; color: rgba(255,255,255,0.42); margin-top: 10px; }
.org__connector { height: 72px; position: relative; }
.org__connector::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: rgba(255,255,255,0.24); }
.org__connector::after { content: ""; position: absolute; left: 25%; right: 25%; bottom: 0; height: 1px; background: rgba(255,255,255,0.24); }
.org__children { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.org__child {
  border: 1px solid rgba(255, 255, 255, 0.18); padding: 38px 42px;
  position: relative; transition: border-color 0.45s, background 0.45s;
}
.org__child::before { content: ""; position: absolute; left: 50%; top: -36px; width: 1px; height: 36px; background: rgba(255,255,255,0.24); }
.org__child:hover { border-color: rgba(201, 168, 120, 0.7); background: rgba(255,255,255,0.05); }
.org__region { font-size: 11.5px; letter-spacing: 0.22em; color: var(--gold-soft); margin-bottom: 14px; }
.org__child h4 { font-size: 20px; color: #fff; }
.org__child p { font-size: 14.5px; color: rgba(234, 240, 246, 0.72); margin-top: 14px; line-height: 1.8; }

/* ---------- 下属企业 ---------- */
.subs { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.sub {
  background: #fff; border: 1px solid var(--line); display: flex; flex-direction: column;
  overflow: hidden; transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}
.sub:hover { transform: translateY(-6px); box-shadow: 0 30px 70px -34px rgba(11, 44, 77, 0.32); }
.sub__visual { height: 230px; position: relative; overflow: hidden; background: var(--navy); }
.sub__visual svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.sub__tag {
  position: absolute; top: 24px; left: 28px; z-index: 2;
  font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
}
.sub__body { padding: 40px 44px 44px; flex: 1; display: flex; flex-direction: column; }
.sub__body h4 { font-size: 23px; color: var(--navy); }
.sub__en { font-size: 11px; letter-spacing: 0.2em; color: var(--muted); margin-top: 11px; }
.sub__body p { font-size: 15px; line-height: 1.9; color: var(--ink-soft); margin-top: 24px; }
.sub__meta { margin-top: auto; padding-top: 28px; border-top: 1px solid var(--line); display: flex; gap: 40px; font-size: 12.5px; color: var(--muted); }
.sub__meta b { display: block; color: var(--navy); font-weight: 700; font-size: 14.5px; margin-top: 5px; }

/* ---------- 动态 ---------- */
.news__head { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 64px; gap: 48px; }
.news__list { border-top: 1px solid var(--line-strong); }
.news__item {
  display: grid; grid-template-columns: 150px 1fr 140px;
  gap: 40px; align-items: baseline;
  padding: 36px 0; border-bottom: 1px solid var(--line);
  transition: padding 0.45s var(--ease), background 0.45s;
}
.news__item:hover { padding-left: 18px; background: linear-gradient(90deg, rgba(11,44,77,0.025), transparent 40%); }
.news__date { font-family: var(--mono); font-size: 12.5px; color: var(--muted); letter-spacing: 0.05em; }
.news__title { font-size: 18.5px; font-weight: 600; line-height: 1.6; color: var(--navy); transition: color 0.3s; }
.news__item:hover .news__title { color: var(--navy-2); }
.news__cat { font-size: 12px; color: var(--muted); text-align: right; letter-spacing: 0.08em; }

/* ---------- 联系 ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 110px; }
.contact__list { margin-top: 56px; }
.contact__row { display: grid; grid-template-columns: 108px 1fr; gap: 24px; padding: 26px 0; border-bottom: 1px solid rgba(255,255,255,0.16); }
.contact__row dt { font-size: 11.5px; letter-spacing: 0.22em; text-transform: uppercase; color: rgba(255,255,255,0.5); padding-top: 5px; }
.contact__row dd { font-size: 16.5px; line-height: 1.8; color: #fff; }
.contact__row dd a:hover { color: var(--gold-soft); }

.contact__card {
  border: 1px solid rgba(255, 255, 255, 0.2); padding: 48px;
  display: flex; flex-direction: column; justify-content: space-between;
  background: rgba(255, 255, 255, 0.05);
}
.contact__card h4 { font-size: 21px; margin-bottom: 16px; color: #fff; }
.contact__card p { font-size: 15px; color: rgba(234, 240, 246, 0.72); line-height: 1.9; }
.contact__qr {
  margin-top: 40px; width: 120px; height: 120px; border: 1px dashed rgba(255,255,255,0.3);
  display: grid; place-items: center; font-size: 11px; letter-spacing: 0.14em;
  color: rgba(255,255,255,0.45); text-align: center; line-height: 1.7;
}

/* ---------- 页脚 ---------- */
.footer { background: var(--navy-deep); color: rgba(234, 240, 246, 0.6); padding: 86px 0 40px; font-size: 13.5px; }
.footer__top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.1fr; gap: 56px; padding-bottom: 56px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer__brand .brand__mark { color: var(--gold-soft); }
.footer__brand .brand__cn { color: #fff; }
.footer__brand .brand__en { color: rgba(234,240,246,0.45); }
.footer__brand p { margin-top: 24px; font-size: 13px; line-height: 1.95; color: rgba(234, 240, 246, 0.5); max-width: 32ch; }
.footer__col h5 { font-size: 11.5px; letter-spacing: 0.22em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 22px; font-weight: 500; }
.footer__col li { margin-bottom: 13px; }
.footer__col a { transition: color 0.3s; }
.footer__col a:hover { color: #fff; }
.footer__bottom {
  display: flex; justify-content: space-between; align-items: center; gap: 28px;
  padding-top: 32px; flex-wrap: wrap; font-size: 12.5px; color: rgba(234, 240, 246, 0.42);
}
.footer__bottom .bec { display: inline-flex; align-items: center; gap: 8px; transition: color 0.3s; }
.footer__bottom .bec:hover { color: #fff; }

/* ---------- 入场 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: 0.09s; }
.reveal[data-d="2"] { transition-delay: 0.18s; }
.reveal[data-d="3"] { transition-delay: 0.27s; }
.reveal[data-d="4"] { transition-delay: 0.36s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  :root { --pad: 40px; }
  .belief { grid-template-columns: 1fr; gap: 60px; }
  .contact { grid-template-columns: 1fr; gap: 64px; }
  .hero__skyline { width: 70%; opacity: 0.5; }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 44px; }
}

@media (max-width: 900px) {
  :root { --pad: 24px; }
  .section { padding: 110px 0; }
  .nav__menu { display: none; }
  .nav__burger { display: flex; flex-direction: column; gap: 5px; padding: 8px; }
  .nav__burger span { width: 24px; height: 2px; background: currentColor; display: block; }
  .hero { padding-top: 118px; }
  .hero__body { padding-bottom: 60px; }
  .hero__skyline { width: 96%; opacity: 0.22; bottom: 96px; }
  .hero__facts { grid-template-columns: 1fr 1fr; gap: 32px 0; }
  .hero__fact:nth-child(3) { padding-left: 0; border-left: none; }
  .hero__fact dd { font-size: 32px; }
  .biz__head { flex-direction: column; align-items: flex-start; gap: 28px; }
  .biz__item { grid-template-columns: 56px 1fr; gap: 18px; padding: 30px 0; }
  .biz__desc { grid-column: 2; }
  .biz__go { display: none; }
  .subs { grid-template-columns: 1fr; }
  .org__children { grid-template-columns: 1fr; }
  .org__connector::after, .org__child::before { display: none; }
  .org__root { flex-direction: column; align-items: flex-start; gap: 18px; padding: 32px; }
  .org__child { padding: 30px; }
  .news__item { grid-template-columns: 1fr; gap: 12px; }
  .news__cat { text-align: left; }
  .footer__top { grid-template-columns: 1fr; }
  .hero__top { flex-wrap: wrap; row-gap: 10px; }
}