/* ===== 自然风格家具 宣传与知识分享站 ===== */
/* ---------- 基础变量与重置 ---------- */
:root {
  --paper: #faf6ef;
  --surface: #fffdf8;
  --ink: #37322b;
  --muted: #847a6c;
  --line: #e8dfd1;
  --wood: #96683f;
  --wood-deep: #6f4a28;
  --sage: #6d7f5c;
  --hero-tint: rgba(38, 30, 21, 0.55);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(80, 60, 30, 0.10);
  --serif: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
::selection { background: var(--wood); color: #fff; }

.container { width: min(1120px, 92%); margin-inline: auto; }

/* ---------- 通用排版 ---------- */
h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.35; color: var(--ink); }
h1 { font-size: clamp(1.9rem, 4.4vw, 3.1rem); font-weight: 600; }
h2 { font-size: clamp(1.45rem, 3vw, 2.1rem); font-weight: 600; }
h3 { font-size: 1.15rem; font-weight: 600; }
.lead { font-size: 1.08rem; color: var(--muted); }
.eyebrow {
  display: inline-block; font-size: 0.8rem; letter-spacing: 0.22em;
  color: var(--wood); text-transform: uppercase; margin-bottom: 0.6rem;
}
.section { padding: 4.2rem 0; }
.sec-head { max-width: 720px; margin-bottom: 2.2rem; }
.sec-head.centered { margin-inline: auto; text-align: center; }
.sec-sub { color: var(--muted); margin-top: 0.6rem; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.6rem; border-radius: 999px;
  background: var(--wood); color: #fff; font-size: 0.95rem;
  transition: background 0.25s, transform 0.2s, box-shadow 0.25s;
  border: 1px solid transparent; cursor: pointer;
}
.btn:hover { background: var(--wood-deep); transform: translateY(-2px); box-shadow: var(--shadow); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--wood); color: var(--wood); background: transparent; }
.btn-row { display: flex; gap: 0.8rem; flex-wrap: wrap; }
/* ---------- 顶栏导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 246, 239, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; min-height: 62px; gap: 1rem; }
.site-nav { display: flex; gap: 1.6rem; margin-left: auto; }
.site-nav a {
  position: relative; padding: 0.35rem 0; font-size: 0.95rem; color: var(--muted);
  transition: color 0.2s;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--wood); transition: width 0.25s;
}
.site-nav a.active { color: var(--wood-deep); font-weight: 600; }
.site-nav a.active::after, .site-nav a:hover::after { width: 100%; }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: 0;
  padding: 8px; cursor: pointer;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); transition: transform 0.25s, opacity 0.2s; }

/* ---------- 首页主视觉 ---------- */
.hero {
  position: relative; min-height: min(78vh, 640px);
  display: flex; align-items: center;
  color: #fff; overflow: hidden;
}
.hero-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(30, 24, 16, 0.72) 12%, rgba(30, 24, 16, 0.25) 55%, rgba(30, 24, 16, 0.35));
}
.hero-inner { position: relative; z-index: 1; max-width: 620px; padding: 5rem 0; }
.hero-inner h1 { color: #fff; margin-bottom: 1rem; }
.hero-inner .lead { color: #f0e8da; }
.hero-inner .eyebrow { color: #e4c79f; }
.hero-inner .btn-row { margin-top: 1.8rem; }
.hero .btn.ghost { color: #fff; border-color: rgba(255,255,255,0.55); }
.hero .btn.ghost:hover { border-color: #fff; color: #fff; }
/* ---------- 组件：卡片 / 图文 / 数据表 ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-media { aspect-ratio: 4 / 3; overflow: hidden; }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.card:hover .card-media img { transform: scale(1.05); }
.card-body { padding: 1.1rem 1.2rem 1.3rem; }
.card-body h3 { margin-bottom: 0.4rem; }
.card-body p { font-size: 0.92rem; color: var(--muted); }
.card-body .tag { font-size: 0.75rem; color: var(--wood); letter-spacing: 0.1em; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 2.4rem; align-items: center; }
.split .media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.split .media img { width: 100%; height: 100%; object-fit: cover; }
.split .text h3 { margin: 0.8rem 0 0.5rem; }
.split .text p { color: var(--muted); font-size: 0.97rem; }
.split .text li { position: relative; padding-left: 1.3rem; margin-bottom: 0.45rem; color: var(--ink); }
.split .text li::before {
  content: ""; position: absolute; left: 0; top: 0.62em; width: 8px; height: 8px;
  background: var(--sage); border-radius: 50%;
}
.text-list h3 { margin-bottom: 1rem; }

.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
table.data { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 640px; }
table.data th {
  text-align: left; background: #f3ecdf; padding: 0.75rem 1rem; font-weight: 600;
  white-space: nowrap;
}
table.data td { padding: 0.75rem 1rem; border-top: 1px solid var(--line); vertical-align: top; }
table.data tr:hover td { background: #fbf7ef; }
table.data .em { color: var(--wood-deep); font-weight: 600; white-space: nowrap; }

/* ---------- 组件：步骤 / 提示 / 引用 / FAQ ---------- */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.4rem; }
.step {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem; position: relative;
}
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  font-family: var(--serif); font-size: 1.7rem; color: #e2cba6; font-weight: 700;
  display: block; margin-bottom: 0.4rem;
}
.step h3 { margin-bottom: 0.4rem; font-size: 1.05rem; }
.step p { font-size: 0.9rem; color: var(--muted); }
.callout {
  background: #f3ecdf; border-left: 4px solid var(--wood); border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.3rem; font-size: 0.95rem; margin: 1.4rem 0;
}
.callout b { color: var(--wood-deep); }
blockquote {
  font-family: var(--serif); font-size: 1.15rem; font-style: italic; color: #5d5344;
  border-left: 3px solid var(--sage); padding-left: 1.2rem; margin: 1.4rem 0;
}
details.faq { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 0 1.2rem; margin-bottom: 0.8rem; }
details.faq summary {
  cursor: pointer; padding: 0.9rem 0; font-weight: 600; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
details.faq summary::after { content: "+"; font-size: 1.3rem; color: var(--wood); }
details.faq[open] summary::after { content: "–"; }
details.faq .a { padding-bottom: 1rem; color: var(--muted); font-size: 0.93rem; }
details.faq .a b { color: var(--ink); }

.chip-row { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.6rem 0 0.4rem; }
.chip { font-size: 0.8rem; color: var(--sage); background: #f0f2e9; border: 1px solid #dbe0cd; padding: 0.25rem 0.9rem; border-radius: 999px; }

/* ---------- 内页横幅 / 提示标签 ---------- */
.page-hero {
  background: linear-gradient(120deg, #efe5d3, #faf6ef);
  border-bottom: 1px solid var(--line); padding: 3.2rem 0 2.6rem;
}
.page-hero h1 { margin-bottom: 0.5rem; }
.page-hero .lead { max-width: 640px; }
.note { font-size: 0.82rem; color: #9a8f7e; margin-top: 0.8rem; }

/* ---------- 回顶按钮 / 滚动浮现 ---------- */
.to-top {
  position: fixed; right: 1.2rem; bottom: 1.2rem; z-index: 40;
  width: 44px; height: 44px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--wood); color: #fff; font-size: 1.15rem;
  opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s, background 0.2s;
}
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { background: var(--wood-deep); }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 880px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 1.4rem; }
}
@media (max-width: 620px) {
  .section { padding: 3rem 0; }
  .cards { grid-template-columns: 1fr; }
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute; top: 62px; left: 0; right: 0; flex-direction: column;
    background: var(--surface); border-bottom: 1px solid var(--line);
    padding: 0.4rem 4%; gap: 0; display: none;
  }
  body.nav-open .site-nav { display: flex; }
  .site-nav a { padding: 0.85rem 0; border-bottom: 1px dashed var(--line); }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}