/* ============================================================
   Taishan Stone 泰山石展示站 — 基础样式 v1（占位模式）
   设计语言：东方美学（米白/墨灰/石青），衬线标题，留白充足
   ============================================================ */

:root {
  --ink: #2b2b28;          /* 墨色主文字 */
  --ink-soft: #5c5a54;     /* 次级文字 */
  --paper: #faf8f3;        /* 米白纸底 */
  --paper-deep: #f1ede3;   /* 深一档纸底 */
  --line: #ded9cb;         /* 分隔线 */
  --stone: #8a8a82;        /* 石灰色 */
  --accent: #7a5c3e;       /* 石褐/大地色 accent */
  --accent-deep: #5f452d;
  --placeholder-bg: #e8e6df; /* 占位图底色 */
  --placeholder-text: #9a978d;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --maxw: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250, 248, 243, 0.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
}
.brand { font-family: var(--font-serif); font-size: 1.35rem; font-weight: 700; letter-spacing: 2px; }
.brand a { color: var(--ink); text-decoration: none; }
.brand .en { display: block; font-size: 0.65rem; font-weight: 400; letter-spacing: 3px; color: var(--stone); text-transform: uppercase; }
.nav-links { display: flex; gap: 26px; list-style: none; }
.nav-links a {
  color: var(--ink-soft); text-decoration: none; font-size: 0.95rem;
  letter-spacing: 1px; padding: 6px 2px; border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); border-bottom-color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink); color: #cfccc2; margin-top: 80px;
  padding: 48px 20px 32px; font-size: 0.88rem;
}
.footer-wrap { max-width: var(--maxw); margin: 0 auto; display: flex; flex-wrap: wrap; gap: 40px; justify-content: space-between; }
.footer-wrap h4 { color: #fff; font-family: var(--font-serif); font-weight: 600; margin-bottom: 10px; letter-spacing: 2px; }
.footer-wrap a { color: #cfccc2; text-decoration: none; }
.footer-wrap a:hover { color: #fff; }
.footer-bottom { max-width: var(--maxw); margin: 32px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.15); font-size: 0.78rem; color: #8f8c82; }

/* ---------- 通用容器/标题 ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0 8px; }
.section-title { font-family: var(--font-serif); font-size: 1.7rem; font-weight: 700; letter-spacing: 3px; margin-bottom: 6px; }
.section-sub { color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 32px; }
.eyebrow { color: var(--accent); font-size: 0.8rem; letter-spacing: 4px; text-transform: uppercase; margin-bottom: 10px; }
.center { text-align: center; }

/* ============================================================
   占位图系统（核心验收点）
   - .img-slot 固定宽高比（正式尺寸），灰底 + 虚线框
   - 占位内容：编号 IMG-XX / 尺寸 / 建议内容 居中叠加
   - <img> 加载成功后覆盖占位层；图片缺失时 onerror 隐藏 img，露出占位
   ============================================================ */
.img-slot {
  position: relative;
  width: 100%;
  background: var(--placeholder-bg);
  border: 2px dashed #b8b4a6;
  border-radius: 6px;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.img-slot img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.img-slot img[data-loaded="1"] { position: relative; display: block; }
.ph-label {
  position: relative; z-index: 1;
  text-align: center; color: var(--placeholder-text);
  padding: 18px;
  user-select: none;
}
.ph-label .ph-id {
  display: block; font-family: var(--font-serif);
  font-size: 1.6rem; font-weight: 700; letter-spacing: 2px; color: #7c786c;
}
.ph-label .ph-size { display: block; font-size: 0.8rem; letter-spacing: 2px; margin-top: 2px; }
.ph-label .ph-note { display: block; font-size: 0.85rem; margin-top: 8px; color: var(--ink-soft); max-width: 320px; margin-left: auto; margin-right: auto; }
.ph-label .ph-prio { display: inline-block; margin-top: 10px; font-size: 0.72rem; letter-spacing: 1px; padding: 2px 10px; border: 1px solid var(--line); border-radius: 99px; color: var(--accent); background: var(--paper); }

/* 固定比例占位（aspect-ratio 保证正式尺寸比例） */
.ratio-16x9  { aspect-ratio: 16 / 9; }   /* 1600×900 / 1920×1080 展示比例 */
.ratio-1x1   { aspect-ratio: 1 / 1; }    /* 1200×1200 产品主图 */
.ratio-4x3   { aspect-ratio: 4 / 3; }    /* 800×600 细节/配图 */
.ratio-4x1   { aspect-ratio: 4 / 1; }    /* 1600×400 banner */

/* ---------- 首页 hero ---------- */
.hero { max-width: var(--maxw); margin: 36px auto 0; padding: 0 20px; }
.hero-slot { aspect-ratio: 16 / 9; }  /* 1920×1080 hero 正式尺寸 */
.hero-title {
  font-family: var(--font-serif); font-size: 2.6rem; font-weight: 700;
  letter-spacing: 6px; margin-top: 48px; text-align: center; line-height: 1.4;
}
.hero-sub { text-align: center; color: var(--ink-soft); margin-top: 14px; font-size: 1.02rem; max-width: 640px; margin-left: auto; margin-right: auto; }
.hero-cta { text-align: center; margin-top: 30px; }
.btn {
  display: inline-block; padding: 12px 34px; border-radius: 4px;
  background: var(--accent); color: #fff; text-decoration: none;
  letter-spacing: 2px; font-size: 0.95rem; transition: background .2s;
}
.btn:hover { background: var(--accent-deep); }
.btn-ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-ghost:hover { background: var(--accent); color: #fff; }

/* ---------- 卡片栅格 ---------- */
.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card { background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.card .card-body { padding: 18px 20px 22px; }
.card h3 { font-family: var(--font-serif); font-size: 1.1rem; font-weight: 600; letter-spacing: 1px; margin-bottom: 6px; }
.card p { color: var(--ink-soft); font-size: 0.9rem; }
.card .meta { color: var(--stone); font-size: 0.8rem; margin-top: 8px; letter-spacing: 1px; }

/* ---------- 产品档案表 ---------- */
.stone-archive { border: 1px solid var(--line); border-radius: 8px; background: #fff; overflow: hidden; margin-bottom: 40px; }
.stone-head { display: flex; align-items: center; gap: 14px; padding: 16px 24px; background: var(--paper-deep); border-bottom: 1px solid var(--line); }
.stone-no { font-family: var(--font-serif); font-size: 1.15rem; font-weight: 700; color: var(--accent); letter-spacing: 1px; }
.stone-name { font-family: var(--font-serif); font-size: 1.1rem; font-weight: 600; }
.stone-status { margin-left: auto; font-size: 0.75rem; color: var(--stone); letter-spacing: 1px; }
.stone-body { padding: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.stone-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; font-size: 0.9rem; margin-bottom: 16px; }
.stone-specs dt { color: var(--stone); font-size: 0.8rem; letter-spacing: 1px; }
.stone-specs dd { margin: 0; }
.stone-story { font-size: 0.92rem; color: var(--ink-soft); }
.stone-story .todo { color: #a07a3a; font-style: italic; }

/* ---------- 文化科普 ---------- */
.article-block { display: grid; grid-template-columns: 340px 1fr; gap: 32px; margin-bottom: 44px; align-items: start; }
.article-block h2 { font-family: var(--font-serif); font-size: 1.4rem; letter-spacing: 2px; margin-bottom: 12px; }
.article-block p { color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 12px; }
.article-block .lead { color: var(--ink); font-size: 1.02rem; }

/* ---------- 联系页 ---------- */
.contact-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 40px; }
.contact-card { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 26px; }
.contact-card h3 { font-family: var(--font-serif); font-size: 1.05rem; margin-bottom: 8px; letter-spacing: 1px; }
.contact-card p { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 6px; }
.contact-card .channel { display: flex; align-items: center; gap: 10px; margin-top: 10px; }
.contact-card .channel .badge { font-size: 0.75rem; padding: 3px 10px; border-radius: 99px; background: var(--paper-deep); border: 1px solid var(--line); letter-spacing: 1px; }

/* 流程步骤 */
.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 36px 0; }
.flow-step { text-align: center; padding: 22px 14px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }
.flow-step .num { display: inline-block; width: 34px; height: 34px; line-height: 34px; border-radius: 50%; background: var(--accent); color: #fff; font-family: var(--font-serif); font-weight: 700; margin-bottom: 10px; }
.flow-step h4 { font-size: 0.95rem; margin-bottom: 6px; }
.flow-step p { font-size: 0.8rem; color: var(--ink-soft); }

/* ---------- TODO 标记（内容专家润色前占位） ---------- */
.todo { color: #a07a3a; }
.todo-block {
  background: #fbf7ec; border: 1px dashed #d8c49a; border-radius: 6px;
  padding: 14px 18px; font-size: 0.85rem; color: #8a6d3b; margin: 18px 0;
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .grid-2, .grid-3, .contact-cards { grid-template-columns: 1fr; }
  .article-block { grid-template-columns: 1fr; }
  .stone-body { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 1.9rem; letter-spacing: 3px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 0.85rem; }
}