/* ============================================
   四川鑫本兴石业 - 全站样式
   高端B端轻奢商务风 / 炭黑·米白·高级灰·金
   移动端优先
   ============================================ */

:root {
  --ink: #1c1c1a;        /* 炭黑 */
  --ink-soft: #2a2a27;
  --paper: #f6f3ee;      /* 米白 */
  --paper-pure: #fbfaf7;
  --gray: #8b8b85;       /* 高级灰 */
  --gray-dark: #55554f;
  --gray-light: #e4e1da;
  --gold: #b8935a;       /* 少量金色点缀 */
  --gold-deep: #9a7944;
  --max: 1280px;
  --pad: clamp(20px, 5vw, 64px);
  --section-y: clamp(64px, 9vw, 130px);
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper-pure);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}

a { color: inherit; text-decoration: none; }

ul { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4, p { margin: 0; }

/* ---------- 通用容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

section { padding-top: var(--section-y); padding-bottom: var(--section-y); }

/* ---------- 区块标题 ---------- */
.sec-head {
  text-align: center;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.sec-head .en {
  display: block;
  font-size: 12px;
  letter-spacing: .35em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
  font-weight: 500;
}

.sec-head h2 {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.3;
}

.sec-head .sub {
  margin-top: 14px;
  color: var(--gray);
  font-size: 15px;
  letter-spacing: .04em;
}

.sec-head--left { text-align: left; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 14px 40px;
  font-size: 14px;
  letter-spacing: .22em;
  border: 1px solid var(--gold);
  color: var(--gold);
  background: transparent;
  transition: background .35s ease, color .35s ease;
  cursor: pointer;
}

.btn:hover { background: var(--gold); color: #fff; }

.btn--solid { background: var(--gold); color: #fff; }
.btn--solid:hover { background: var(--gold-deep); border-color: var(--gold-deep); }

.btn--light { border-color: rgba(255,255,255,.7); color: #fff; }
.btn--light:hover { background: #fff; color: var(--ink); border-color: #fff; }

/* ============================================
   顶部导航
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(28, 28, 26, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: background .3s ease;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand { display: flex; flex-direction: column; line-height: 1.2; }

.brand .cn {
  color: #fff;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .12em;
}

.brand .en {
  color: var(--gold);
  font-size: 9px;
  letter-spacing: .18em;
  text-transform: uppercase;
  margin-top: 3px;
}

.nav { display: none; }

.nav a {
  color: rgba(255,255,255,.82);
  font-size: 15px;
  letter-spacing: .1em;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color .25s, border-color .25s;
}

.nav a:hover, .nav a.active {
  color: #fff;
  border-bottom-color: var(--gold);
}

.nav-toggle {
  display: block;
  background: none;
  border: 0;
  width: 40px; height: 40px;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  background: #fff;
  margin: 7px 0;
  transition: transform .3s, opacity .3s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8.5px) rotate(-45deg); }

/* 移动端抽屉 */
.nav.open {
  display: flex;
  position: absolute;
  top: 68px; left: 0; right: 0;
  flex-direction: column;
  background: rgba(28,28,26,.98);
  padding: 12px var(--pad) 24px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.nav.open a {
  padding: 13px 0;
  border-bottom: 1px solid rgba(255,255,255,.07);
  font-size: 16px;
}

@media (min-width: 900px) {
  .site-header .wrap { height: 80px; }
  .brand .cn { font-size: 22px; }
  .nav { display: flex; gap: clamp(18px, 2.6vw, 38px); align-items: center; }
  .nav-toggle { display: none; }
  .nav.open { position: static; flex-direction: row; padding: 0; background: none; border: 0; }
  .nav.open a { padding: 6px 0; border-bottom: 1px solid transparent; }
}

/* ============================================
   Hero 全屏
   ============================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  padding: 120px var(--pad) 80px;
  background: var(--ink);
  overflow: hidden;
}

.hero-slides { position: absolute; inset: 0; }

.hero-slides .slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.6s ease;
}

.hero-slides .slide.active { opacity: 1; }

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20,20,18,.55) 0%, rgba(20,20,18,.35) 45%, rgba(20,20,18,.72) 100%);
}

.hero-inner { position: relative; z-index: 2; max-width: 900px; }

.hero-inner .en {
  font-size: clamp(11px, 1.6vw, 14px);
  letter-spacing: .5em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 26px;
}

.hero-inner h1 {
  font-size: clamp(34px, 7vw, 68px);
  font-weight: 600;
  letter-spacing: .16em;
  line-height: 1.35;
}

.hero-inner .sub {
  margin-top: 22px;
  font-size: clamp(15px, 2.2vw, 20px);
  letter-spacing: .4em;
  color: rgba(255,255,255,.85);
}

.hero-inner .desc {
  margin: 26px auto 0;
  max-width: 640px;
  color: rgba(255,255,255,.62);
  font-size: 15px;
  letter-spacing: .05em;
}

.hero-inner .btn { margin-top: 44px; }

.hero-scroll {
  position: absolute;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: rgba(255,255,255,.55);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
}

/* ============================================
   企业简介 + 数字
   ============================================ */
.about { background: var(--paper-pure); }

.about-grid {
  display: grid;
  gap: clamp(36px, 5vw, 72px);
  align-items: center;
}

.about-media { position: relative; }

.about-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.about-media .badge {
  position: absolute;
  right: -8px; bottom: -18px;
  background: var(--ink);
  color: #fff;
  padding: 18px 26px;
  text-align: center;
}

.about-media .badge b {
  display: block;
  font-size: 30px;
  color: var(--gold);
  font-weight: 600;
  line-height: 1.2;
}

.about-media .badge span { font-size: 12px; letter-spacing: .18em; color: rgba(255,255,255,.75); }

.about-text .en {
  display: block;
  font-size: 12px;
  letter-spacing: .35em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.about-text h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  letter-spacing: .08em;
  margin-bottom: 24px;
}

.about-text p {
  color: var(--gray-dark);
  font-size: 15.5px;
  margin-bottom: 16px;
  text-align: justify;
}

.about-text .btn { margin-top: 18px; }

/* 数字展示 */
.stats {
  background: var(--ink);
  color: #fff;
  padding-top: clamp(48px, 6vw, 84px);
  padding-bottom: clamp(48px, 6vw, 84px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(28px, 4vw, 48px) 20px;
  text-align: center;
}

.stats-grid .num {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 600;
  color: var(--gold);
  line-height: 1.15;
  letter-spacing: .04em;
}

.stats-grid .num small { font-size: .45em; font-weight: 500; margin-left: 4px; letter-spacing: .1em; }

.stats-grid .label {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .16em;
  color: rgba(255,255,255,.62);
}

@media (min-width: 760px) {
  .about-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(5, 1fr); }
}

/* ============================================
   产品中心 5 卡
   ============================================ */
.products { background: var(--paper); }

.prod-grid {
  display: grid;
  gap: clamp(20px, 2.5vw, 30px);
  grid-template-columns: 1fr;
}

.prod-card {
  background: var(--paper-pure);
  border: 1px solid var(--gray-light);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .35s ease, transform .35s ease;
}

.prod-card:hover { box-shadow: 0 18px 44px rgba(28,28,26,.1); transform: translateY(-4px); }

.prod-card .thumb { overflow: hidden; aspect-ratio: 4/3; }

.prod-card .thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}

.prod-card:hover .thumb img { transform: scale(1.05); }

.prod-card .body { padding: 26px 26px 30px; flex: 1; display: flex; flex-direction: column; }

.prod-card .idx {
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--gold);
  margin-bottom: 10px;
}

.prod-card h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: .1em;
  margin-bottom: 12px;
}

.prod-card .meta {
  font-size: 13.5px;
  color: var(--gray);
  margin-bottom: 8px;
  letter-spacing: .03em;
}

.prod-card .use {
  font-size: 13.5px;
  color: var(--gray-dark);
  padding-top: 12px;
  border-top: 1px dashed var(--gray-light);
  margin-top: auto;
}

.prod-card .use b { color: var(--ink); font-weight: 600; }

@media (min-width: 640px) { .prod-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .prod-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1280px) { .prod-grid { grid-template-columns: repeat(5, 1fr); } }

/* ============================================
   一站式服务 6 项
   ============================================ */
.service { background: var(--paper-pure); }

.svc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(24px, 3vw, 44px) clamp(16px, 2vw, 32px);
}

.svc-item { text-align: center; padding: 8px 6px; }

.svc-item .ico {
  width: 64px; height: 64px;
  margin: 0 auto 18px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
}

.svc-item .ico svg { width: 30px; height: 30px; stroke: currentColor; fill: none; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }

.svc-item h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .1em;
  margin-bottom: 8px;
}

.svc-item .en {
  display: block;
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
}

.svc-item p { font-size: 13.5px; color: var(--gray); line-height: 1.7; }

@media (min-width: 900px) { .svc-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1100px) { .svc-grid { grid-template-columns: repeat(6, 1fr); } }

/* ============================================
   精品工程案例 4 卡
   ============================================ */
.cases { background: var(--ink); color: #fff; }

.cases .sec-head h2 { color: #fff; }
.cases .sec-head .sub { color: rgba(255,255,255,.55); }

.case-grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  grid-template-columns: 1fr;
}

.case-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.case-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .7s ease;
}

.case-card:hover img { transform: scale(1.06); }

.case-card .overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20,20,18,0) 40%, rgba(20,20,18,.88) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
}

.case-card .tag {
  align-self: flex-start;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--gold);
  border: 1px solid rgba(184,147,90,.65);
  padding: 3px 12px;
  margin-bottom: 12px;
}

.case-card h3 { font-size: 19px; font-weight: 600; letter-spacing: .08em; }

.case-card .part {
  font-size: 13px;
  color: rgba(255,255,255,.65);
  margin-top: 6px;
  letter-spacing: .05em;
}

@media (min-width: 640px) { .case-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .case-grid { grid-template-columns: repeat(4, 1fr); } }

/* ============================================
   新闻动态 3 条
   ============================================ */
.news { background: var(--paper); }

.news-list { display: grid; gap: clamp(20px, 2.5vw, 30px); }

.news-item {
  display: grid;
  background: var(--paper-pure);
  border: 1px solid var(--gray-light);
  overflow: hidden;
  transition: box-shadow .3s ease;
}

.news-item:hover { box-shadow: 0 14px 34px rgba(28,28,26,.08); }

.news-item .thumb { aspect-ratio: 16/10; overflow: hidden; }

.news-item .thumb img { width: 100%; height: 100%; object-fit: cover; }

.news-item .body { padding: 24px 26px 28px; }

.news-item .date {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: 10px;
}

.news-item h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .05em;
  line-height: 1.55;
  margin-bottom: 10px;
}

.news-item p { font-size: 14px; color: var(--gray); line-height: 1.8; }

@media (min-width: 760px) { .news-list { grid-template-columns: repeat(3, 1fr); } }

/* ============================================
   合作伙伴 LOGO 墙
   ============================================ */
.partners { background: var(--paper-pure); }

.logo-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--gray-light);
  border-left: 1px solid var(--gray-light);
}

.logo-wall li {
  border-right: 1px solid var(--gray-light);
  border-bottom: 1px solid var(--gray-light);
  aspect-ratio: 5/3;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
  background: #fff;
}

.logo-wall img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: grayscale(1);
  opacity: .72;
  transition: filter .35s, opacity .35s;
}

.logo-wall li:hover img { filter: grayscale(0); opacity: 1; }

@media (min-width: 640px) { .logo-wall { grid-template-columns: repeat(5, 1fr); } }
@media (min-width: 1024px) { .logo-wall { grid-template-columns: repeat(5, 1fr); } }

/* ============================================
   页脚
   ============================================ */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,.72);
  padding-top: clamp(52px, 7vw, 88px);
}

.foot-grid {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  padding-bottom: clamp(40px, 5vw, 64px);
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.foot-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .16em;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.foot-col h4::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 28px; height: 1.5px;
  background: var(--gold);
}

.foot-brand .cn { color: #fff; font-size: 20px; font-weight: 600; letter-spacing: .1em; }
.foot-brand .en { color: var(--gold); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; margin-top: 6px; display: block; }
.foot-brand p { margin-top: 16px; font-size: 13.5px; line-height: 1.9; color: rgba(255,255,255,.55); }

.foot-col li { margin-bottom: 11px; font-size: 14px; }

.foot-col a { transition: color .25s; }
.foot-col a:hover { color: var(--gold); }

.foot-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; line-height: 1.7; }
.foot-contact .k { color: rgba(255,255,255,.45); flex-shrink: 0; letter-spacing: .1em; }
.foot-contact .tel { color: var(--gold); font-size: 20px; font-weight: 600; letter-spacing: .06em; display: block; margin-bottom: 4px; }

.foot-bottom {
  padding: 22px 0;
  text-align: center;
  font-size: 12.5px;
  color: rgba(255,255,255,.38);
  letter-spacing: .06em;
}

@media (min-width: 760px) {
  .foot-grid { grid-template-columns: 1.4fr 1fr 1.2fr; }
}

/* ============================================
   内页横幅 (banner)
   ============================================ */
.page-banner {
  position: relative;
  min-height: clamp(300px, 46vw, 460px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  background: var(--ink) center/cover no-repeat;
  padding: 130px var(--pad) 70px;
}

.page-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20,20,18,.62), rgba(20,20,18,.5));
}

.page-banner .inner { position: relative; z-index: 2; }

.page-banner .en {
  display: block;
  font-size: 12px;
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.page-banner h1 {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 600;
  letter-spacing: .18em;
}

.page-banner .crumb {
  margin-top: 18px;
  font-size: 13px;
  color: rgba(255,255,255,.6);
  letter-spacing: .1em;
}

.page-banner .crumb a:hover { color: var(--gold); }

/* ============================================
   内页通用内容块
   ============================================ */
.content { background: var(--paper-pure); }

.intro-grid {
  display: grid;
  gap: clamp(32px, 4.5vw, 64px);
  align-items: center;
}

.intro-grid img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }

.intro-text .en {
  display: block;
  font-size: 12px;
  letter-spacing: .35em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.intro-text h2 { font-size: clamp(24px, 3.2vw, 34px); font-weight: 600; letter-spacing: .08em; margin-bottom: 22px; }
.intro-text p { color: var(--gray-dark); font-size: 15.5px; margin-bottom: 15px; text-align: justify; }

@media (min-width: 860px) { .intro-grid { grid-template-columns: 1fr 1fr; } }
.intro-grid.rev .intro-media { order: 2; }
@media (min-width: 860px) { .intro-grid.rev { direction: rtl; } .intro-grid.rev > * { direction: ltr; } }

/* 值/values 四宫格 */
.value-grid { display: grid; gap: clamp(18px, 2.4vw, 28px); grid-template-columns: 1fr; }

.value-card {
  background: var(--paper);
  border-top: 2px solid var(--gold);
  padding: 30px 28px 34px;
}

.value-card .no { font-size: 12px; letter-spacing: .3em; color: var(--gold); margin-bottom: 12px; }
.value-card h3 { font-size: 19px; font-weight: 600; letter-spacing: .1em; margin-bottom: 12px; }
.value-card p { font-size: 14px; color: var(--gray-dark); text-align: justify; }

@media (min-width: 640px) { .value-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .value-grid { grid-template-columns: repeat(4, 1fr); } }

/* 产品内页大卡（图文交替） */
.pdetail {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
  padding: clamp(36px, 5vw, 64px) 0;
  border-bottom: 1px solid var(--gray-light);
}

.pdetail:last-child { border-bottom: 0; }
.pdetail .media { overflow: hidden; }
.pdetail .media img { width: 100%; aspect-ratio: 16/10; object-fit: cover; transition: transform .6s; }
.pdetail:hover .media img { transform: scale(1.03); }

.pdetail .no { font-size: 12px; letter-spacing: .32em; color: var(--gold); margin-bottom: 12px; }
.pdetail h2 { font-size: clamp(23px, 3vw, 32px); font-weight: 600; letter-spacing: .1em; margin-bottom: 8px; }
.pdetail .slogan { color: var(--gray); font-size: 13px; letter-spacing: .2em; text-transform: uppercase; margin-bottom: 18px; }
.pdetail p { color: var(--gray-dark); font-size: 15px; margin-bottom: 14px; text-align: justify; }

.pdetail .specs { margin-top: 18px; display: grid; gap: 8px; }

.pdetail .specs li {
  font-size: 14px;
  color: var(--gray-dark);
  padding-left: 18px;
  position: relative;
}

.pdetail .specs li::before {
  content: "";
  position: absolute;
  left: 0; top: 11px;
  width: 7px; height: 1.5px;
  background: var(--gold);
}

@media (min-width: 880px) {
  .pdetail { grid-template-columns: 1fr 1fr; }
  .pdetail.rev .media { order: 2; }
}

/* 流程（服务内页） */
.flow { display: grid; gap: 0; counter-reset: step; }

.flow-step {
  position: relative;
  padding: 26px 26px 26px 84px;
  background: var(--paper);
  border-bottom: 1px solid var(--gray-light);
}

.flow-step:last-child { border-bottom: 0; }

.flow-step::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 24px; top: 26px;
  font-size: 22px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: .05em;
}

.flow-step h3 { font-size: 18px; font-weight: 600; letter-spacing: .08em; margin-bottom: 8px; }
.flow-step .en { font-size: 10.5px; letter-spacing: .2em; text-transform: uppercase; color: var(--gray); display: block; margin-bottom: 8px; }
.flow-step p { font-size: 14px; color: var(--gray-dark); }

@media (min-width: 900px) {
  .flow { grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--gray-light); border-left: 1px solid var(--gray-light); }
  .flow-step { border-right: 1px solid var(--gray-light); border-bottom: 1px solid var(--gray-light); min-height: 220px; }
  .flow { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 900px) and (max-width: 1199px) { .flow { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1200px) { .flow { grid-template-columns: repeat(4, 1fr); } }

/* 案例内页网格 */
.case-masonry { display: grid; gap: clamp(18px, 2.4vw, 28px); grid-template-columns: 1fr; }

.case-masonry .case-card { aspect-ratio: 16/11; }

@media (min-width: 640px) { .case-masonry { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .case-masonry { grid-template-columns: repeat(3, 1fr); } }

/* 联系页 */
.contact-grid { display: grid; gap: clamp(30px, 4vw, 60px); }

.contact-info { display: grid; gap: 26px; }

.info-block { border-left: 2px solid var(--gold); padding-left: 20px; }
.info-block .k { font-size: 12px; letter-spacing: .26em; color: var(--gold); text-transform: uppercase; display: block; margin-bottom: 8px; }
.info-block .v { font-size: 16.5px; color: var(--ink); line-height: 1.8; }
.info-block .v.big { font-size: 26px; font-weight: 600; letter-spacing: .05em; color: var(--gold); }

.contact-map {
  background: var(--paper);
  border: 1px solid var(--gray-light);
  padding: clamp(28px, 4vw, 48px);
}

.contact-map h3 { font-size: 19px; font-weight: 600; letter-spacing: .1em; margin-bottom: 16px; }
.contact-map p { font-size: 14.5px; color: var(--gray-dark); margin-bottom: 10px; }

.biz-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }

.biz-tags li {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gray-dark);
  border: 1px solid var(--gray-light);
  background: #fff;
  padding: 7px 16px;
}

@media (min-width: 880px) { .contact-grid { grid-template-columns: 1fr 1.1fr; } }

/* CTA 条 */
.cta {
  background: var(--ink);
  color: #fff;
  text-align: center;
  padding-top: clamp(56px, 7vw, 96px);
  padding-bottom: clamp(56px, 7vw, 96px);
}

.cta h2 { font-size: clamp(24px, 3.4vw, 36px); font-weight: 600; letter-spacing: .12em; margin-bottom: 16px; }
.cta p { color: rgba(255,255,255,.6); font-size: 15px; letter-spacing: .06em; margin-bottom: 34px; }
.cta .tel { display: block; font-size: clamp(26px, 4vw, 38px); color: var(--gold); font-weight: 600; letter-spacing: .08em; margin-bottom: 30px; }

/* 工具类 */
.center { text-align: center; }
.mt-40 { margin-top: 40px; }
.bg-paper { background: var(--paper); }
.dark { background: var(--ink); color: #fff; }

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}