/* ==========================================================================
   钉钉官网 最终版 v154 - 水磨石碎石风格 (Terrazzo Fleck System)
   骨架：全出血横带 ｜ 首屏竖向叙事长段 ｜ 底部三入口并排 ｜ 页脚单行
   配色：主色绯红 #873226 ｜ 辅色藤黄 #E2D9CA ｜ 点缀石青 #2FA778 ｜ 深底 #1F0D09 ｜ 浅底 #FAF6F0
   字体：庞门正道标题体, Bodoni Moda, "WenQuanYi Micro Hei", "PingFang SC", sans-serif
   ========================================================================== */

:root {
  --terrazzo-red: #873226;          /* 主色绯红 */
  --terrazzo-red-hover: #6d241a;    /* 绯红深悬停色 */
  --terrazzo-red-light: #fbeee9;    /* 浅绯粉红底色 */
  --terrazzo-ochre: #E2D9CA;        /* 辅色藤黄 (浅暖象牙藤黄) */
  --terrazzo-ochre-dark: #b8ab96;   /* 藤黄边框深色 */
  --terrazzo-cyan: #2FA778;         /* 点缀石青 (苍劲沉稳绿青) */
  --terrazzo-cyan-light: #e6f7f0;   /* 石青微光浅底 */
  --terrazzo-bg: #FAF6F0;           /* 水磨石浅底色 */
  --terrazzo-card: #FFFFFF;         /* 纯白卡片 */
  --terrazzo-dark: #1F0D09;         /* 沉静暗赭舱底色 */
  --text-dark: #2A1713;             /* 正文深赭褐 */
  --text-muted: #6B5550;            /* 辅文字暖灰褐色 */
  --text-light: #FAF6F0;            /* 浅底白字 */
  --font-serif: "Bodoni Moda", "Didot", "Songti SC", "SimSun", serif;
  --font-title: "PangMenZhengDao", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "WenQuanYi Micro Hei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 10px rgba(135, 50, 38, 0.06);
  --shadow-md: 0 8px 24px rgba(135, 50, 38, 0.10);
  --shadow-lg: 0 16px 40px rgba(135, 50, 38, 0.15);
  --shadow-solid: 4px 4px 0 var(--terrazzo-red);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--terrazzo-bg);
  color: var(--text-dark);
}

body {
  font-family: var(--font-body);
  line-height: 1.68;
  background-color: var(--terrazzo-bg);
  /* 水磨石碎石 + 席纹交织质感背景 */
  background-image: 
    radial-gradient(var(--terrazzo-ochre-dark) 1.3px, transparent 1.3px),
    radial-gradient(rgba(135, 50, 38, 0.12) 1.1px, transparent 1.1px),
    linear-gradient(45deg, rgba(226, 217, 202, 0.25) 25%, transparent 25%, transparent 75%, rgba(226, 217, 202, 0.25) 75%),
    linear-gradient(45deg, rgba(226, 217, 202, 0.25) 25%, transparent 25%, transparent 75%, rgba(226, 217, 202, 0.25) 75%);
  background-size: 28px 28px, 44px 44px, 16px 16px, 16px 16px;
  background-position: 0 0, 14px 14px, 0 0, 8px 8px;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部吸顶导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(250, 246, 240, 0.95);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 2px solid var(--terrazzo-ochre);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-dark);
}

.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--terrazzo-red);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--terrazzo-ochre);
  box-shadow: 2px 2px 0 var(--terrazzo-cyan);
  overflow: hidden;
}

.brand-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--terrazzo-red);
  font-family: var(--font-title);
}

.brand-badge {
  font-size: 11px;
  font-weight: 800;
  background: var(--terrazzo-cyan);
  color: #FFFFFF;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-dark);
  text-decoration: none;
  transition: all 0.25s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--terrazzo-red);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--terrazzo-red);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮通用系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--terrazzo-red);
  color: #FFFFFF;
  border-color: var(--terrazzo-red);
  box-shadow: 2px 2px 0 var(--terrazzo-dark);
}

.btn-primary:hover {
  background: var(--terrazzo-red-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--terrazzo-dark);
}

.btn-secondary {
  background: var(--terrazzo-ochre);
  color: var(--text-dark);
  border-color: var(--terrazzo-ochre-dark);
}

.btn-secondary:hover {
  background: #f1ebd8;
  border-color: var(--terrazzo-red);
  color: var(--terrazzo-red);
}

.btn-cyan {
  background: var(--terrazzo-cyan);
  color: #FFFFFF;
  border-color: var(--terrazzo-cyan);
  box-shadow: 2px 2px 0 var(--terrazzo-dark);
}

.btn-cyan:hover {
  background: #258f66;
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--terrazzo-dark);
}

.btn-outline {
  background: transparent;
  color: var(--terrazzo-red);
  border-color: var(--terrazzo-red);
}

.btn-outline:hover {
  background: var(--terrazzo-red-light);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-md {
  padding: 12px 24px;
  font-size: 15px;
}

.btn-lg {
  padding: 14px 30px;
  font-size: 16px;
}

/* 全出血横带骨架 (Full-Bleed Bands) */
.full-bleed-band {
  width: 100%;
  padding: 72px 0;
  border-bottom: 2px solid var(--terrazzo-ochre);
}

.band-light {
  background-color: var(--terrazzo-bg);
}

.band-alt {
  background-color: #FFFFFF;
}

.band-tint {
  background-color: var(--terrazzo-red-light);
  border-top: 2px solid var(--terrazzo-ochre);
}

.band-dark {
  background-color: var(--terrazzo-dark);
  color: var(--text-light);
  border-bottom: 3px solid var(--terrazzo-cyan);
}

/* 1. 首屏竖向叙事长段区 (Hero Section) */
.hero-narrative {
  padding: 64px 0 80px;
  position: relative;
}

.narrative-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--terrazzo-ochre);
  color: var(--terrazzo-red);
  border: 1.5px solid var(--terrazzo-ochre-dark);
  font-size: 13px;
  font-weight: 800;
  border-radius: 4px;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.narrative-title {
  font-size: 44px;
  line-height: 1.25;
  font-weight: 900;
  color: var(--text-dark);
  font-family: var(--font-title);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.narrative-title span {
  color: var(--terrazzo-red);
  position: relative;
  display: inline-block;
}

.narrative-title span::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 8px;
  background: rgba(47, 167, 120, 0.25);
  z-index: -1;
}

.narrative-lead {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-muted);
  max-width: 980px;
  margin-bottom: 32px;
  border-left: 4px solid var(--terrazzo-cyan);
  padding-left: 20px;
  background: rgba(255, 255, 255, 0.6);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-visual-frame {
  background: #FFFFFF;
  border: 2px solid var(--terrazzo-ochre-dark);
  border-radius: var(--radius-md);
  padding: 12px;
  box-shadow: 6px 6px 0 var(--terrazzo-red);
  position: relative;
  overflow: hidden;
}

.hero-visual-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

/* 章节头部规范 */
.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 52px;
}

.section-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1.5px;
  color: var(--terrazzo-red);
  background: var(--terrazzo-ochre);
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
  text-transform: uppercase;
  border: 1px solid var(--terrazzo-ochre-dark);
}

.section-title {
  font-size: 32px;
  font-weight: 900;
  color: var(--text-dark);
  font-family: var(--font-title);
  margin-bottom: 16px;
  line-height: 1.35;
}

.band-dark .section-title {
  color: #FFFFFF;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

.band-dark .section-subtitle {
  color: #D2C4BE;
}

/* 2. 核心功能收束区 (4列卡片) */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-terrazzo-card {
  background: #FFFFFF;
  border: 2px solid var(--terrazzo-ochre);
  border-radius: var(--radius-md);
  padding: 30px 22px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  position: relative;
}

.feature-terrazzo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 16px;
  right: 16px;
  height: 4px;
  background: var(--terrazzo-ochre-dark);
  transition: background 0.3s;
}

.feature-terrazzo-card:hover {
  transform: translateY(-6px);
  border-color: var(--terrazzo-red);
  box-shadow: 4px 4px 0 var(--terrazzo-cyan);
}

.feature-terrazzo-card:hover::before {
  background: var(--terrazzo-red);
}

.feature-fleck-tag {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--terrazzo-red-light);
  color: var(--terrazzo-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 18px;
  margin-bottom: 18px;
  border: 1.5px solid var(--terrazzo-ochre-dark);
  font-family: var(--font-serif);
}

.feature-title {
  font-size: 19px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 12px;
  font-family: var(--font-title);
}

.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.feature-link {
  font-size: 14px;
  font-weight: 800;
  color: var(--terrazzo-red);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.feature-link:hover {
  color: var(--terrazzo-cyan);
}

/* 3. 产品亮点交替区 (左右图文) */
.highlight-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}

.highlight-row:last-child {
  margin-bottom: 0;
}

.highlight-row.reverse {
  direction: rtl;
}

.highlight-row.reverse > * {
  direction: ltr;
}

.highlight-media {
  background: #FFFFFF;
  border: 2px solid var(--terrazzo-ochre-dark);
  border-radius: var(--radius-md);
  padding: 12px;
  box-shadow: 4px 4px 0 var(--terrazzo-red);
}

.highlight-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}

.highlight-content h3 {
  font-size: 26px;
  font-weight: 900;
  color: var(--text-dark);
  margin-bottom: 16px;
  font-family: var(--font-title);
  line-height: 1.35;
}

.highlight-content p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}

.terrazzo-bullet-list {
  list-style: none;
}

.terrazzo-bullet-item {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--text-dark);
  margin-bottom: 10px;
  font-weight: 700;
}

.terrazzo-bullet-item::before {
  content: '▪';
  position: absolute;
  left: 4px;
  color: var(--terrazzo-cyan);
  font-size: 18px;
  top: -2px;
}

/* 4. 数据与信任背书区 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1.5px solid rgba(226, 217, 202, 0.2);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  transition: all 0.3s;
}

.stat-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--terrazzo-cyan);
  transform: translateY(-4px);
}

.stat-num {
  font-size: 40px;
  font-weight: 900;
  color: var(--terrazzo-ochre);
  font-family: var(--font-serif);
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: #D2C4BE;
  font-weight: 700;
}

/* 5. 使用场景区 (3列卡片) */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.scenario-card {
  background: #FFFFFF;
  border: 2px solid var(--terrazzo-ochre);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}

.scenario-card:hover {
  transform: translateY(-6px);
  border-color: var(--terrazzo-red);
  box-shadow: 4px 4px 0 var(--terrazzo-cyan);
}

.scenario-thumb {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--terrazzo-ochre);
}

.scenario-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

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

.scenario-body {
  padding: 24px;
}

.scenario-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  color: #FFFFFF;
  background: var(--terrazzo-cyan);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.scenario-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 10px;
  font-family: var(--font-title);
}

.scenario-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 6. 底部三入口并排区 (Bottom 3 Entrances) */
.entrances-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.entrance-box {
  background: #FFFFFF;
  border: 2px solid var(--terrazzo-ochre-dark);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 4px 4px 0 var(--terrazzo-red);
  transition: all 0.3s;
}

.entrance-box:hover {
  transform: translateY(-4px);
  box-shadow: 6px 6px 0 var(--terrazzo-cyan);
  border-color: var(--terrazzo-red);
}

.entrance-badge {
  font-size: 12px;
  font-weight: 900;
  background: var(--terrazzo-red-light);
  color: var(--terrazzo-red);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
  border: 1px solid rgba(135, 50, 38, 0.2);
}

.entrance-title {
  font-size: 21px;
  font-weight: 900;
  color: var(--text-dark);
  font-family: var(--font-title);
  margin-bottom: 12px;
}

.entrance-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.entrance-qr-wrap {
  margin-bottom: 20px;
  padding: 8px;
  background: #FAF6F0;
  border: 1.5px solid var(--terrazzo-ochre-dark);
  border-radius: 6px;
}

.entrance-qr-wrap img {
  display: block;
  border-radius: 4px;
}

/* 7. 页脚单行 (Single-Line Clean Footer) */
.site-footer-single {
  background: var(--terrazzo-dark);
  color: #D2C4BE;
  padding: 24px 0;
  border-top: 3px solid var(--terrazzo-red);
  font-size: 13px;
}

.footer-single-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links-inline {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links-inline a {
  color: var(--terrazzo-ochre);
  text-decoration: none;
  transition: color 0.2s;
  font-weight: 700;
}

.footer-links-inline a:hover {
  color: var(--terrazzo-cyan);
}

.footer-single-copy {
  color: #A99691;
  font-size: 12px;
}

/* 页面专用样式：下载页与网页版入口页 */
.download-hero {
  padding: 60px 0;
  text-align: center;
}

.download-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.matrix-card {
  background: #FFFFFF;
  border: 2px solid var(--terrazzo-ochre);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 4px 4px 0 var(--terrazzo-red);
  transition: all 0.3s;
}

.matrix-card:hover {
  transform: translateY(-4px);
  border-color: var(--terrazzo-red);
  box-shadow: 6px 6px 0 var(--terrazzo-cyan);
}

.matrix-icon-box {
  width: 54px;
  height: 54px;
  background: var(--terrazzo-red-light);
  color: var(--terrazzo-red);
  border-radius: 12px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 900;
  border: 1.5px solid var(--terrazzo-ochre-dark);
}

.matrix-card h3 {
  font-size: 20px;
  font-weight: 900;
  color: var(--text-dark);
  font-family: var(--font-title);
  margin-bottom: 8px;
}

.matrix-card p {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3,
  .entrances-grid,
  .download-matrix {
    grid-template-columns: 1fr;
  }
  .highlight-row,
  .highlight-row.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .narrative-title {
    font-size: 34px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .narrative-title {
    font-size: 28px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .footer-single-inner {
    flex-direction: column;
    text-align: center;
  }
}