@charset "utf-8";
/* ==========================================================================
   Keepme 高端楼梯定制 - 公共样式
   主色调：深灰 + 金色  |  现代简约商务  |  响应式（手机 / 电脑）
   ========================================================================== */

/* ---------- 1. 变量与基础 ---------- */
:root {
  --ink-900: #1c1f22;
  --ink-800: #24282c;
  --ink-700: #31363b;
  --ink-600: #454b51;
  --gold: #c6a15b;
  --gold-dark: #a9863f;
  --gold-soft: #f5efe2;
  --text: #2a2e33;
  --muted: #6e777f;
  --line: #e4e7ea;
  --bg: #ffffff;
  --bg-soft: #f6f7f8;
  --radius: 4px;
  --shadow: 0 6px 24px rgba(28, 31, 34, .07);
  --header-h: 72px;
  --container: 1200px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
}

img { display: block; max-width: 100%; height: auto; border: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { font-weight: 600; line-height: 1.35; color: var(--ink-900); }
button, input, select, textarea { font: inherit; color: inherit; }

/* ---------- 2. 布局工具 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark { background: var(--ink-900); }

.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: block;
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold-dark);
  font-weight: 600;
  margin-bottom: 12px;
}
.section-head h2 { font-size: 30px; letter-spacing: .01em; }
.section-head p { margin-top: 14px; color: var(--muted); }

.rule { width: 48px; height: 2px; background: var(--gold); margin-top: 20px; }
.section-head--center .rule { margin-left: auto; margin-right: auto; }

.grid { display: grid; gap: 28px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 3. 通用按钮 ---------- */
.btn {
  display: inline-block;
  padding: 13px 32px;
  border: 1px solid var(--gold);
  border-radius: var(--radius);
  background: var(--gold);
  color: #fff;
  font-size: 15px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background-color .2s, color .2s, border-color .2s;
}
.btn:hover { background: var(--gold-dark); border-color: var(--gold-dark); }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .55); }
.btn--ghost:hover { background: var(--gold); border-color: var(--gold); color: #fff; }
.btn--outline { background: transparent; color: var(--gold-dark); }
.btn--outline:hover { background: var(--gold); border-color: var(--gold); color: #fff; }
.btn--block { display: block; width: 100%; text-align: center; }

/* ---------- 4. 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink-900);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand__mark {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .18em;
  color: #fff;
}
.brand__mark span { color: var(--gold); }
.brand__sub {
  font-size: 12px;
  letter-spacing: .18em;
  color: rgba(255, 255, 255, .5);
}

.nav { display: flex; align-items: center; gap: 34px; }
.nav a {
  position: relative;
  font-size: 15px;
  color: rgba(255, 255, 255, .78);
  padding: 6px 0;
  transition: color .2s;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transition: transform .2s;
}
.nav a:hover { color: #fff; }
.nav a:hover::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--gold); }
.nav a[aria-current="page"]::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 10px 8px;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  background: #fff;
  margin-bottom: 5px;
}
.nav-toggle span:last-child { margin-bottom: 0; }

/* ---------- 5. 首页 Banner ---------- */
.hero {
  position: relative;
  min-height: 620px;
  display: flex;
  align-items: center;
  background: var(--ink-900) url("../images/hero.jpg") center / cover no-repeat;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(20, 23, 26, .88) 0%, rgba(20, 23, 26, .62) 52%, rgba(20, 23, 26, .35) 100%);
}
.hero .container { position: relative; z-index: 1; }
.hero__inner { max-width: 760px; padding: 60px 0; }
.hero h1 {
  color: #fff;
  font-size: 46px;
  line-height: 1.28;
  letter-spacing: .02em;
}
.hero h1 em { font-style: normal; color: var(--gold); }
.hero__sub {
  margin-top: 20px;
  font-size: 18px;
  letter-spacing: .08em;
  color: rgba(255, 255, 255, .82);
}
.hero__desc {
  margin-top: 22px;
  max-width: 560px;
  color: rgba(255, 255, 255, .68);
}
.hero__actions { margin-top: 38px; display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- 6. 内页 Banner ---------- */
.page-banner {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: center;
  background: var(--ink-900) center / cover no-repeat;
}
.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(20, 23, 26, .72);
}
.page-banner .container { position: relative; z-index: 1; }
.page-banner h1 { color: #fff; font-size: 34px; }
.page-banner p { margin-top: 12px; color: rgba(255, 255, 255, .7); letter-spacing: .06em; }
.page-banner--product { background-image: url("../images/banner-product.jpg"); }
.page-banner--case { background-image: url("../images/banner-case.jpg"); }
.page-banner--about { background-image: url("../images/banner-about.jpg"); }
.page-banner--contact { background-image: url("../images/banner-contact.jpg"); }

.crumb { margin-top: 18px; font-size: 13px; color: rgba(255, 255, 255, .55); letter-spacing: .04em; }
.crumb a:hover { color: var(--gold); }

/* ---------- 7. 卡片：产品 / 案例 ---------- */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.card:hover { border-color: var(--gold); box-shadow: var(--shadow); }
.card__media { position: relative; background: var(--ink-800); overflow: hidden; }
.card__media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.card__tag {
  position: absolute;
  left: 14px; top: 14px;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: #fff;
  background: rgba(28, 31, 34, .72);
  border-left: 2px solid var(--gold);
}
.card__body { padding: 22px 22px 24px; }
.card__body h3 { font-size: 18px; }
.card__body p { margin-top: 10px; color: var(--muted); font-size: 14px; }
.card__more {
  display: inline-block;
  margin-top: 16px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold-dark);
}
.card__more::after { content: " →"; }

/* 案例卡片：整图 + 悬浮标题条 */
.case-card { display: block; background: var(--ink-800); border-radius: var(--radius); overflow: hidden; position: relative; }
.case-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: opacity .2s; }
.case-card:hover img { opacity: .82; }
.case-card__info { padding: 18px 20px 20px; background: #fff; border: 1px solid var(--line); border-top: 0; }
.case-card:hover .case-card__info { border-color: var(--gold); }
.case-card__info h3 { font-size: 17px; }
.case-card__info p { margin-top: 6px; font-size: 13px; color: var(--muted); }

/* ---------- 8. 服务优势 ---------- */
.adv { padding: 30px 26px 32px; background: #fff; border: 1px solid var(--line); border-top: 2px solid var(--gold); border-radius: var(--radius); }
.adv__no { font-size: 26px; font-weight: 700; color: var(--gold); letter-spacing: .04em; }
.adv h3 { font-size: 18px; margin-top: 12px; }
.adv p { margin-top: 10px; font-size: 14px; color: var(--muted); }

/* 深色板块里的优势项 */
.section--dark .eyebrow { color: var(--gold); }
.section--dark .section-head h2,
.section--dark .adv h3 { color: #fff; }
.section--dark .section-head p,
.section--dark .adv p { color: rgba(255, 255, 255, .58); }
.section--dark .adv {
  background: var(--ink-800);
  border-color: rgba(255, 255, 255, .1);
  border-top-color: var(--gold); /* 保留顶部金色装饰线 */
}

/* ---------- 9. 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { text-align: center; }
.stat strong { display: block; font-size: 34px; font-weight: 700; color: var(--gold); letter-spacing: .02em; }
.stat span { display: block; margin-top: 6px; font-size: 14px; color: var(--muted); }

/* ---------- 10. 图文双栏 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split__media img { width: 100%; border-radius: var(--radius); }
.split__text h2 { font-size: 28px; }
.split__text p { margin-top: 16px; color: var(--muted); }
.split__text ul { margin-top: 22px; }
.split__text li { position: relative; padding-left: 22px; margin-bottom: 10px; color: var(--ink-600); }
.split__text li::before {
  content: "";
  position: absolute;
  left: 0; top: 11px;
  width: 8px; height: 2px;
  background: var(--gold);
}

/* ---------- 11. 产品明细（产品页） ---------- */
.pd { display: grid; grid-template-columns: 1.05fr 1fr; gap: 52px; align-items: center; padding: 62px 0; border-bottom: 1px solid var(--line); }
.pd:last-child { border-bottom: 0; }
.pd:nth-child(even) .pd__media { order: 2; }
.pd__media img { width: 100%; border-radius: var(--radius); }
.pd__text .eyebrow { margin-bottom: 10px; }
.pd__text h2 { font-size: 27px; }
.pd__text > p { margin-top: 16px; color: var(--muted); }
.spec { margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; }
.spec div { padding: 10px 0; border-top: 1px solid var(--line); font-size: 14px; }
.spec dt { color: var(--muted); font-size: 13px; }
.spec dd { color: var(--ink-800); }

/* ---------- 12. 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.info-list { border-top: 1px solid var(--line); }
.info-list li { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.info-list .k { flex: 0 0 96px; color: var(--muted); font-size: 14px; }
.info-list .v { color: var(--ink-800); }
.info-list .v small { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }

.form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; }
.form h3 { font-size: 19px; }
.form > p { margin-top: 8px; font-size: 13px; color: var(--muted); }
.field { margin-top: 18px; }
.field label { display: block; font-size: 13px; color: var(--ink-600); margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 11px 13px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  transition: border-color .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--gold);
}
.field textarea { min-height: 104px; resize: vertical; }
.form .btn { margin-top: 24px; }
.form__note { margin-top: 14px; font-size: 12px; color: var(--muted); }

.qr-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 8px; }
.qr { text-align: center; }
.qr img { width: 100%; max-width: 168px; margin: 0 auto; border: 1px solid var(--line); border-radius: var(--radius); }
.qr p { margin-top: 10px; font-size: 13px; color: var(--muted); }

.map-box {
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  background: var(--bg-soft) repeating-linear-gradient(45deg, rgba(28, 31, 34, .035) 0 10px, transparent 10px 20px);
  border: 1px dashed #cfd4d8;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  padding: 24px;
}

/* ---------- 13. CTA 条 ---------- */
.cta {
  background: var(--ink-900) url("../images/hero.jpg") center / cover no-repeat;
  position: relative;
}
.cta::before { content: ""; position: absolute; inset: 0; background: rgba(20, 23, 26, .84); }
.cta .container { position: relative; z-index: 1; }
.cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 60px 0;
  flex-wrap: wrap;
}
.cta h2 { color: #fff; font-size: 26px; }
.cta p { margin-top: 8px; color: rgba(255, 255, 255, .65); }
.cta__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 14. 页脚 ---------- */
.site-footer { background: var(--ink-900); color: rgba(255, 255, 255, .68); padding-top: 60px; font-size: 14px; }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1.2fr; gap: 44px; padding-bottom: 46px; }
.footer-brand .brand__mark { font-size: 20px; }
.footer-brand p { margin-top: 16px; color: rgba(255, 255, 255, .5); max-width: 340px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 18px; letter-spacing: .06em; }
.footer-col li { margin-bottom: 10px; }
.footer-col a:hover { color: var(--gold); }
.footer-contact li { margin-bottom: 10px; }
.footer-contact b { color: rgba(255, 255, 255, .45); font-weight: 400; }
.footer-qr { display: flex; gap: 18px; margin-top: 18px; }
.footer-qr figure { text-align: center; }
.footer-qr img { width: 92px; border-radius: var(--radius); border: 1px solid rgba(255, 255, 255, .14); }
.footer-qr figcaption { margin-top: 8px; font-size: 12px; color: rgba(255, 255, 255, .45); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .09);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255, 255, 255, .42);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1024px) {
  .section { padding: 68px 0; }
  .hero { min-height: 540px; }
  .hero h1 { font-size: 38px; }
  /* 中等宽度下收紧导航，避免换行 */
  .nav { gap: 22px; }
  .nav a { font-size: 14px; }
  .brand__sub { display: none; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 34px 24px; }
  .split, .pd, .contact-grid { grid-template-columns: 1fr; gap: 34px; }
  .pd { padding: 48px 0; }
  .pd:nth-child(even) .pd__media { order: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  body { font-size: 15px; }
  .container { padding: 0 18px; }
  .section { padding: 54px 0; }
  .section-head { margin-bottom: 32px; }
  .section-head h2 { font-size: 24px; }
  .hero { min-height: 460px; }
  .hero h1 { font-size: 30px; }
  .hero__sub { font-size: 15px; }
  .hero__desc { font-size: 14px; }
  .page-banner { min-height: 240px; }
  .page-banner h1 { font-size: 26px; }
  .cta h2 { font-size: 21px; }

  /* 移动端导航 */
  .nav-toggle { display: block; }
  .nav {
    position: absolute;
    left: 0; right: 0; top: var(--header-h);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--ink-800);
    border-top: 1px solid rgba(255, 255, 255, .08);
    padding: 8px 18px 16px;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 14px 2px; border-bottom: 1px solid rgba(255, 255, 255, .07); font-size: 15px; }
  .nav a::after { display: none; }
  .site-header { position: sticky; }
  .header-inner { position: relative; }

  .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .spec { grid-template-columns: 1fr; }
  .qr-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .form { padding: 22px 18px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; padding-bottom: 34px; }
  .footer-bottom { font-size: 12px; }
  .cta__inner { padding: 44px 0; }
  .btn { padding: 12px 24px; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 25px; }
  .qr-row { grid-template-columns: 1fr; }
  .hero__actions .btn { flex: 1 1 100%; text-align: center; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}