/* ============================================================
   栖居设计 QIJU —— 侘寂极简设计系统
   纸白 #f5f3ef / 墨黑 #191613 / 木铜 #a8825c
   衬线大标题 · 细分割线 · 错落案例墙 · 锐利小圆角
   ============================================================ */

:root {
  --paper: #f5f3ef;
  --paper-dark: #ece7dd;
  --ink: #191613;
  --ink-soft: #2a251f;
  --wood: #a8825c;
  --wood-dark: #8f6c48;
  --muted: #8b8478;
  --line: #e4ddd0;
  --radius: 4px;
  --shadow: 0 12px 36px rgba(25, 22, 19, .08);
  --shadow-lg: 0 22px 60px rgba(25, 22, 19, .14);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }

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

ul, ol { list-style: none; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(245, 243, 239, .92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s;
}
.nav.scrolled { border-color: var(--line); box-shadow: 0 6px 24px rgba(25, 22, 19, .06); }

.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: var(--radius);
  background: var(--ink); color: var(--wood);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-weight: 700; font-size: 20px;
}
.brand-text { font-family: var(--serif); font-weight: 700; font-size: 18px; letter-spacing: 2px; line-height: 1.2; }
.brand-sub { display: block; font-family: var(--sans); font-size: 9px; letter-spacing: 3.5px; font-weight: 600; color: var(--muted); }

.menu { display: flex; align-items: center; gap: 34px; }
.menu a { font-weight: 600; font-size: 15px; color: var(--ink); letter-spacing: 1px; transition: color .2s; }
.menu a:hover { color: var(--wood-dark); }
.menu-cta {
  background: var(--ink); color: #fff !important;
  padding: 10px 24px; border-radius: 2px;
  letter-spacing: 2px;
  transition: background .25s;
}
.menu-cta:hover { background: var(--wood-dark) !important; }

.hamburger {
  display: none;
  flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px;
  background: none; border: none; cursor: pointer;
}
.hamburger span {
  display: block; width: 22px; height: 2px; border-radius: 1px;
  background: var(--ink); transition: transform .3s, opacity .3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 首屏 ===== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex; align-items: center;
  padding: 150px 0 90px;
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background: url("../images/hero.jpg") center/cover no-repeat;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to right, rgba(25, 22, 19, .82) 0%, rgba(25, 22, 19, .42) 55%, rgba(25, 22, 19, .15) 100%);
}
.hero .container { position: relative; z-index: 1; }

.hero-eyebrow { font-size: 13px; letter-spacing: 6px; color: var(--wood); margin-bottom: 26px; }
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 700; line-height: 1.3;
  letter-spacing: 6px;
}
.hero h1 span { color: var(--wood); }
.hero-desc { max-width: 480px; margin-top: 26px; font-size: 16px; color: rgba(255, 255, 255, .82); line-height: 2; }

.hero-cta { display: flex; gap: 18px; margin-top: 42px; flex-wrap: wrap; }

.hero-stats {
  display: flex; gap: 64px; margin-top: 72px; flex-wrap: wrap;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, .25);
}
.hero-stats b { display: block; font-family: var(--serif); font-size: 32px; font-weight: 700; color: #fff; }
.hero-stats span { font-size: 13px; letter-spacing: 2px; color: rgba(255, 255, 255, .55); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 15px 38px; border-radius: 2px;
  font-size: 15px; font-weight: 600;
  letter-spacing: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .25s, transform .25s, border-color .25s;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--wood-dark); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .55); }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); }
.btn-block { width: 100%; }

/* ===== 通用段 ===== */
.section { padding: 100px 0; }
.section-tint { background: var(--paper-dark); }
.section-dark { background: var(--ink); color: #fff; }
.section-dark .section-title { color: #fff; }
.section-dark .section-desc { color: rgba(255, 255, 255, .5); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 64px; }
.eyebrow { font-size: 12px; letter-spacing: 6px; color: var(--wood-dark); font-weight: 700; margin-bottom: 16px; }
.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4.2vw, 42px);
  font-weight: 700; line-height: 1.35;
  letter-spacing: 4px;
}
.section-desc { margin-top: 16px; font-size: 15px; color: var(--muted); }

/* ===== 案例墙 ===== */
.cases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 225px;
  gap: 16px;
}
.case {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  cursor: pointer;
}
.case-big { grid-column: span 2; grid-row: span 2; }
.case-wide { grid-column: span 2; }
.case img { width: 100%; height: 100%; object-fit: cover; transition: transform .7s ease; }
.case:hover img { transform: scale(1.05); }
.case figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 36px 20px 16px;
  background: linear-gradient(to top, rgba(25, 22, 19, .8), transparent);
  color: #fff;
}
.case figcaption b { display: block; font-family: var(--serif); font-size: 16px; font-weight: 700; letter-spacing: 2px; }
.case figcaption span { font-size: 12px; letter-spacing: 2px; color: rgba(255, 255, 255, .7); }

/* ===== 服务卡片 ===== */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px 30px;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card-no { font-family: var(--serif); font-size: 15px; color: var(--wood-dark); letter-spacing: 3px; }
.card h3 {
  font-family: var(--serif);
  font-size: 22px; font-weight: 700; letter-spacing: 3px;
  margin: 14px 0 12px;
}
.card p { font-size: 14px; color: var(--muted); line-height: 1.8; }
.card .price {
  margin-top: 20px; padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 26px; font-weight: 700; color: var(--ink);
}
.card .price span { font-family: var(--sans); font-size: 13px; font-weight: 500; color: var(--muted); letter-spacing: 1px; }

/* ===== 承诺 ===== */
.promises { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.promise {
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: border-color .3s, background .3s;
}
.promise:hover { border-color: var(--wood); background: rgba(168, 130, 92, .07); }
.promise h3 {
  font-family: var(--serif);
  font-size: 19px; font-weight: 700; letter-spacing: 2px;
  margin-bottom: 12px;
}
.promise p { font-size: 14px; color: rgba(255, 255, 255, .55); line-height: 1.9; }

/* ===== 流程 ===== */
.steps {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.steps li { padding: 40px 28px; border-left: 1px solid var(--line); }
.steps li:first-child { border-left: none; }
.steps b { font-family: var(--serif); font-size: 15px; color: var(--wood-dark); letter-spacing: 3px; }
.steps h3 { font-family: var(--serif); font-size: 19px; font-weight: 700; letter-spacing: 2px; margin: 12px 0 8px; }
.steps p { font-size: 13px; color: var(--muted); line-height: 1.8; }

/* ===== 预约量房 ===== */
.booking-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: start;
}
.booking-grid > div > p { margin-top: 16px; color: var(--muted); max-width: 440px; }

.contact-info { margin-top: 36px; }
.contact-info li {
  display: flex; gap: 18px; align-items: flex-start;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.contact-info li:last-child { border-bottom: none; }
.contact-info svg { color: var(--wood-dark); flex-shrink: 0; margin-top: 2px; }
.contact-info b { display: block; font-size: 15px; font-weight: 700; letter-spacing: 1px; }
.contact-info span { font-size: 14px; color: var(--muted); }

.form {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px;
  box-shadow: var(--shadow-lg);
}
.form h3 { font-family: var(--serif); font-size: 22px; font-weight: 700; letter-spacing: 3px; margin-bottom: 24px; }
.form input, .form select, .form textarea {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
  font: inherit; font-size: 15px; color: var(--ink);
  outline: none;
  transition: border-color .2s;
}
.form textarea { resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { border-color: var(--wood); }

.form-tip { margin-top: 14px; font-size: 13px; color: var(--muted); min-height: 18px; }
.form-tip.ok { color: #3f7d4e; }
.form-tip.err { color: #a83d24; }

/* ===== 页脚 ===== */
.footer { background: var(--ink); padding: 36px 0; }
.footer-inner { text-align: center; }
.footer p { font-size: 14px; letter-spacing: 2px; color: rgba(255, 255, 255, .6); }
.footer p + p { margin-top: 6px; font-size: 13px; color: rgba(255, 255, 255, .38); }

/* ===== 滚动出现动画 ===== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .hamburger { display: flex; }
  .menu {
    position: fixed; top: 0; right: 0;
    height: 100vh; width: min(320px, 82vw);
    background: var(--paper);
    flex-direction: column; align-items: flex-start;
    padding: 100px 32px 32px;
    gap: 0;
    transform: translateX(100%);
    transition: transform .3s ease;
    box-shadow: -20px 0 60px rgba(25, 22, 19, .18);
  }
  .menu.open { transform: none; }
  .menu a { width: 100%; padding: 15px 0; font-size: 17px; border-bottom: 1px solid var(--line); }
  .menu .menu-cta { margin-top: 24px; text-align: center; border-bottom: none; }

  .cases { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 200px; }
  .case-big { grid-column: span 2; }
  .case-wide { grid-column: span 2; }

  .promises { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps li:nth-child(3) { border-left: none; }
  .steps li:nth-child(n+3) { border-top: 1px solid var(--line); }
  .booking-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-stats { gap: 40px; margin-top: 52px; }
}

@media (max-width: 640px) {
  .cards { grid-template-columns: 1fr; }
  .cases { grid-template-columns: 1fr; grid-auto-rows: 240px; }
  .case-big, .case-wide { grid-column: span 1; }
  .case-big { grid-row: span 1; }
  .promises { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps li, .steps li:nth-child(3) { border-left: none; border-top: 1px solid var(--line); }
  .steps li:first-child { border-top: none; }
  .hero { min-height: 88vh; padding-top: 130px; }
  .hero h1 { font-size: clamp(32px, 9.5vw, 44px); }
  .section { padding: 76px 0; }
  .form { padding: 28px; }
}