/* ===================================================================
   驱动精灵官方网站 - 核心样式表 (SEO最终版)
   适配标准：Windows 11 Fluent Design / 必应搜索引擎收录规范
   =================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-glow: rgba(37, 99, 235, 0.18);
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  
  --text-title: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, 0.08), 0 4px 10px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 35px -5px rgba(37, 99, 235, 0.12);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.65;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

/* 容器定义 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 辅助类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-muted { color: var(--text-muted); }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ===================================================================
   1. 顶栏 (Header / Topbar)
   左 logo，右五个文字链，同一行两端对齐
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-title);
  letter-spacing: -0.3px;
}

.brand-logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.brand-badge {
  font-size: 11px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 6px;
  border: 1px solid rgba(37, 99, 235, 0.15);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-title);
  position: relative;
  padding: 6px 2px;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.nav-btn-highlight {
  background: var(--primary);
  color: #fff !important;
  padding: 8px 18px !important;
  border-radius: var(--radius-full);
  font-weight: 600 !important;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.nav-btn-highlight:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

/* ===================================================================
   2. 主视觉 (Hero Card)
   通栏大圆角卡片，标题和说明靠左，说明只占卡片宽度的 70%
   温室门口地垫设计隐喻集成
   =================================================================== */
.hero-section {
  padding: 32px 0 20px 0;
}

.hero-card {
  width: 100%;
  background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(191, 219, 254, 0.6);
  box-shadow: var(--shadow-lg);
  padding: 56px 48px;
  position: relative;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -120px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(147, 197, 253, 0.25) 0%, rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-title);
  letter-spacing: -0.5px;
  margin-bottom: 18px;
  text-align: left;
}

.hero-title .brand-gradient {
  background: linear-gradient(135deg, #1d4ed8 0%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  width: 70%;
  max-width: 70%;
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
  text-align: left;
  margin-bottom: 36px;
}

/* ---「温室门口地垫」视觉骨架实现 --- */
.greenhouse-metaphor-wrapper {
  margin-top: 36px;
  background: #ffffff;
  border: 1px solid #dbeafe;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.greenhouse-metaphor-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid #f1f5f9;
}

.metaphor-badge {
  font-size: 13px;
  font-weight: 600;
  color: #0369a1;
  background: #e0f2fe;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.greenhouse-visual-stage {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
  align-items: center;
}

.greenhouse-canvas-structure {
  position: relative;
  background: linear-gradient(180deg, #fef9c3 0%, #eff6ff 60%, #e2e8f0 100%);
  border-radius: var(--radius-md);
  border: 2px solid #cbd5e1;
  padding: 28px 24px;
  overflow: hidden;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.04);
}

/* 门外之光 */
.outside-light-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 140px;
  background: radial-gradient(ellipse at 50% 0%, rgba(254, 240, 138, 0.7) 0%, rgba(255, 255, 255, 0) 75%);
  pointer-events: none;
}

/* 门：上半开着 */
.door-structure-container {
  position: relative;
  z-index: 2;
  height: 150px;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  margin-bottom: 0;
}

.door-frame {
  width: 240px;
  height: 140px;
  border: 4px solid #94a3b8;
  border-bottom: none;
  background: rgba(254, 243, 199, 0.35);
  position: relative;
  box-shadow: 0 4px 20px rgba(253, 224, 71, 0.3);
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.door-open-leaf {
  width: 140px;
  height: 132px;
  background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  border-radius: 4px 0 0 0;
  box-shadow: -4px 0 15px rgba(30, 64, 175, 0.4);
  transform: perspective(400px) rotateY(-38deg);
  transform-origin: right center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: #ffffff;
  padding: 10px;
  border-left: 2px solid #93c5fd;
}

.door-name {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 1px;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.door-sub {
  font-size: 10px;
  color: #bfdbfe;
  margin-top: 4px;
}

/* 门槛：两端文字 */
.threshold-sill {
  position: relative;
  z-index: 3;
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
  height: 32px;
  background: #cbd5e1;
  border: 1px solid #94a3b8;
  border-radius: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
}

.threshold-left, .threshold-right {
  font-size: 12px;
  font-weight: 700;
  color: #1e293b;
  display: flex;
  align-items: center;
  gap: 4px;
}

.threshold-left::before {
  content: "⬇";
  color: #2563eb;
  font-size: 11px;
}

.threshold-right::before {
  content: "🌿";
  font-size: 11px;
}

/* 门槛外地垫：主视觉 */
.entrance-mat {
  position: relative;
  z-index: 4;
  width: 100%;
  max-width: 340px;
  margin: 8px auto 0 auto;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  border: 3px solid #38bdf8;
  border-radius: 8px;
  padding: 16px 20px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.35);
  text-align: center;
}

.mat-pattern {
  border: 1px dashed rgba(56, 189, 248, 0.4);
  border-radius: 6px;
  padding: 8px 12px;
}

.mat-title {
  font-size: 18px;
  font-weight: 800;
  color: #38bdf8;
  letter-spacing: 2px;
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.6);
}

.mat-desc {
  font-size: 11px;
  color: #94a3b8;
  margin-top: 2px;
}

.greenhouse-image-frame {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  background: #fff;
}

.greenhouse-image-frame img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.greenhouse-image-frame:hover img {
  transform: scale(1.02);
}

/* ===================================================================
   3. 下载区 (Download Section)
   整行居中的一颗胶囊按钮，下面一行灰色系统说明 (唯一主行动)
   =================================================================== */
.download-action-section {
  padding: 40px 0 30px 0;
  text-align: center;
}

.btn-capsule-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 14px;
}

.btn-capsule {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  padding: 18px 48px;
  border-radius: var(--radius-full);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-capsule::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: 0.6s ease;
}

.btn-capsule:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(37, 99, 235, 0.45);
}

.btn-capsule:hover::before {
  left: 100%;
}

.capsule-icon {
  width: 28px;
  height: 28px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.capsule-subtext {
  font-size: 13px;
  font-weight: 400;
  opacity: 0.9;
  margin-left: 6px;
}

.system-spec-grey {
  font-size: 14px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.system-spec-grey span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===================================================================
   4. 数据 (Stats)
   四列等宽白卡片：用户、日活、下载、国家
   =================================================================== */
.stats-section {
  padding: 30px 0;
}

.stats-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #bfdbfe;
}

.stat-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.1;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.stat-card:nth-child(1) .stat-number { color: #2563eb; }
.stat-card:nth-child(2) .stat-number { color: #059669; }
.stat-card:nth-child(3) .stat-number { color: #7c3aed; }
.stat-card:nth-child(4) .stat-number { color: #ea580c; }

.stat-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 4px;
}

.stat-subtext {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===================================================================
   5. 介绍 (Intro Band)
   一条浅蓝到浅紫的通栏色带，标题加一段长文 (品牌说明)
   =================================================================== */
.intro-band-section {
  margin: 40px 0;
  padding: 56px 0;
  background: linear-gradient(135deg, #e0f2fe 0%, #ede9fe 100%);
  border-top: 1px solid rgba(191, 219, 254, 0.5);
  border-bottom: 1px solid rgba(221, 214, 254, 0.5);
}

.intro-content-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.intro-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: #4338ca;
  background: rgba(255, 255, 255, 0.85);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.intro-title {
  font-size: 30px;
  font-weight: 800;
  color: var(--text-title);
  margin-bottom: 20px;
  line-height: 1.35;
}

.intro-text-long {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 20px;
}

.intro-features-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

.intro-chip {
  background: rgba(255, 255, 255, 0.9);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: #312e81;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(199, 210, 254, 0.6);
}

.intro-image-card {
  background: #ffffff;
  padding: 16px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

/* ===================================================================
   6. 功能 (Features)
   左对齐标题，下面三列共六张卡 (核心功能)
   =================================================================== */
.features-section {
  padding: 50px 0;
}

.section-title-left {
  font-size: 30px;
  font-weight: 800;
  color: var(--text-title);
  text-align: left;
  margin-bottom: 10px;
}

.section-subtitle-left {
  font-size: 16px;
  color: var(--text-muted);
  text-align: left;
  margin-bottom: 36px;
}

.features-grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #93c5fd;
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

.features-banner-img {
  margin-top: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

/* ===================================================================
   7. 分类 (Categories)
   四列居中卡片，每张一个线性图标：显卡、网卡、声卡、主板
   =================================================================== */
.categories-section {
  padding: 40px 0 50px 0;
  background: #f1f5f9;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.categories-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #60a5fa;
}

.category-linear-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px auto;
  border-radius: 50%;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.category-linear-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 1.8;
}

.category-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 8px;
}

.category-tags {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===================================================================
   8. 问答 (Q&A / FAQ)
   五张通栏白卡片，问题和答案全部摊开：安装、备份、失败、离线、系统
   =================================================================== */
.faq-section {
  padding: 50px 0;
}

.faq-list-5 {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 36px;
}

.faq-full-card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 32px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-full-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #93c5fd;
}

.faq-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.faq-category-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.2);
  flex-shrink: 0;
}

.faq-question {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-title);
  margin: 0;
}

.faq-answer {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.75;
  padding-left: 56px;
}

/* ===================================================================
   9. 指南 (Guides)
   一行四张等分小卡：新手、备份、设置、离线
   =================================================================== */
.guides-section {
  padding: 40px 0 60px 0;
}

.guides-row-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.guide-card-small {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.guide-card-small:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #2563eb;
}

.guide-step-num {
  font-size: 12px;
  font-weight: 700;
  color: #2563eb;
  background: #eff6ff;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.guide-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 8px;
}

.guide-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===================================================================
   10. 页脚 (Footer)
   四列：一段介绍加三组列表，上下各一条细线，版权居中
   =================================================================== */
.site-footer {
  background: #ffffff;
  padding: 50px 0 30px 0;
  border-top: 1px solid #e2e8f0;
}

.footer-top-line {
  height: 1px;
  background: #e2e8f0;
  margin-bottom: 40px;
}

.footer-grid-4 {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr 0.9fr 0.9fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-col-intro {
  padding-right: 20px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-title);
  margin-bottom: 14px;
}

.footer-intro-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 14px;
}

.footer-heading {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 16px;
  position: relative;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link-item a {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-link-item a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom-line {
  height: 1px;
  background: #e2e8f0;
  margin-bottom: 24px;
}

.footer-copyright {
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.8;
}

/* ===================================================================
   下载页与帮助中心专有模块样式
   =================================================================== */
.page-hero {
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
  padding: 48px 0 36px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb-nav a:hover {
  color: var(--primary);
}

.download-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.dl-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}

.dl-card.highlight {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
}

.card-top-tag {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: var(--radius-full);
}

.dl-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.dl-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 8px;
}

.dl-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.dl-meta-list {
  background: #f8fafc;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--text-body);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.dl-meta-item {
  display: flex;
  justify-content: space-between;
}

.btn-download-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  padding: 14px 20px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 16px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.btn-download-primary:hover {
  background: var(--primary-hover);
}

.btn-download-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #f1f5f9;
  color: var(--text-title);
  padding: 14px 20px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 16px;
  border: 1px solid var(--border-color);
}

.btn-download-secondary:hover {
  background: #e2e8f0;
}

.data-table-container {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.custom-table th, .custom-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
}

.custom-table th {
  background: #f8fafc;
  color: var(--text-title);
  font-weight: 700;
}

/* 帮助中心搜索与问答 */
.help-search-container {
  max-width: 640px;
  margin: 24px auto 0 auto;
  position: relative;
}

.help-search-input {
  width: 100%;
  padding: 16px 20px 16px 48px;
  border-radius: var(--radius-full);
  border: 2px solid #bfdbfe;
  font-size: 16px;
  outline: none;
  background: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.08);
}

.help-search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.18);
}

.help-search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary);
  font-size: 18px;
}

.help-cats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.help-cat-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.help-cat-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.help-articles-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 50px;
}

.help-article-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  box-shadow: var(--shadow-sm);
}

.help-article-card h3 {
  font-size: 18px;
  color: var(--text-title);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.help-article-card p {
  color: var(--text-body);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 10px;
}

.help-article-card ol, .help-article-card ul {
  padding-left: 24px;
  margin-bottom: 12px;
  color: var(--text-body);
  font-size: 14px;
  line-height: 1.8;
}

/* ===================================================================
   响应式断点 (Media Queries)
   =================================================================== */
@media (max-width: 1024px) {
  .hero-desc {
    width: 90%;
    max-width: 90%;
  }
  .stats-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }
  .categories-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .guides-row-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .greenhouse-visual-stage {
    grid-template-columns: 1fr;
  }
  .intro-content-layout {
    grid-template-columns: 1fr;
  }
  .download-cards-grid {
    grid-template-columns: 1fr;
  }
  .help-cats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 14px;
  }
  .nav-link {
    font-size: 13px;
  }
  .hero-card {
    padding: 36px 20px;
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-desc {
    width: 100%;
    max-width: 100%;
    font-size: 15px;
  }
  .btn-capsule {
    font-size: 17px;
    padding: 14px 28px;
  }
  .stats-grid-4 {
    grid-template-columns: 1fr;
  }
  .features-grid-6 {
    grid-template-columns: 1fr;
  }
  .categories-grid-4 {
    grid-template-columns: 1fr;
  }
  .guides-row-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid-4 {
    grid-template-columns: 1fr;
  }
  .help-cats-grid {
    grid-template-columns: 1fr;
  }
  .faq-answer {
    padding-left: 0;
    margin-top: 8px;
  }
}


.features-section,
.faq-section,
.guides-section,
.categories-section,
.intro-band-section,
.site-footer {
  content-visibility: auto;
  contain-intrinsic-size: auto 520px;
}

.brand-logo-img{height:40px;width:auto;display:block;}