/* ======================================================
   河南酷易驰商贸有限公司 2025 重构版样式表
   主题：建材超市 · 一站采购  /  工业仓储 + 电商体验
   ====================================================== */

/* ==================== CSS变量系统 ==================== */
:root {
  --color-primary: #ff5722;           /* 工业橙 */
  --color-primary-dark: #e64a19;
  --color-secondary: #11151a;         /* 仓储夜色 */
  --color-accent: #00c6b8;            /* 智能科技绿 */
  --color-steel: #cfd4db;             /* 钢结构银 */
  --color-concrete: #9e9e9e;          /* 水泥灰 */
  --color-surface: #1d232c;
  --color-surface-light: #2a313d;
  --color-surface-muted: #f5f6f8;
  --color-text-primary: #0f1115;
  --color-text-secondary: #3c4048;
  --color-text-light: rgba(255, 255, 255, 0.78);
  --color-border: rgba(255, 255, 255, 0.12);
  --color-border-dark: #2e343e;
  --color-border-light: #e0e4ea;

  --gradient-warehouse: linear-gradient(135deg, #0d1016 0%, #18212b 40%, #ff6a00 110%);
  --gradient-shelf: linear-gradient(145deg, rgba(255, 87, 34, 0.25), rgba(255, 255, 255, 0));
  --gradient-card: linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
  --gradient-highlight: radial-gradient(circle at 20% 20%, rgba(255, 110, 64, 0.4), transparent 55%);

  --font-family-base: 'Source Han Sans', 'DIN Alternate', 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family-heading: 'DIN Condensed', 'Microsoft YaHei', 'PingFang SC', sans-serif;

  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 34px;
  --font-size-4xl: 44px;
  --font-size-5xl: 64px;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 72px;

  --border-radius-sm: 6px;
  --border-radius-md: 10px;
  --border-radius-lg: 18px;
  --border-radius-xl: 28px;
  --border-radius-full: 999px;

  --shadow-sm: 0 4px 16px rgba(13, 16, 22, 0.08);
  --shadow-md: 0 20px 35px rgba(15, 18, 24, 0.18);
  --shadow-lg: 0 40px 60px rgba(0, 0, 0, 0.35);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  --max-width-container: 1240px;
  --line-height-base: 1.6;
  --line-height-heading: 1.25;
}

/* ==================== 全局重置 ==================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: #f3f4f7;
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
  border-radius: var(--border-radius-md);
}

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

a:hover {
  color: var(--color-primary-dark);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-2xl);
}

.section-eyebrow {
  font-size: var(--font-size-sm);
  letter-spacing: 0.2em;
  color: var(--color-concrete);
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-3xl);
  color: var(--color-secondary);
}

.section-desc {
  max-width: 600px;
  color: #5c626e;
}

/* ==================== 网格系统 ==================== */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ==================== 按钮系统 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-full);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(120deg, #ff7a45, #ff5722 80%);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(9, 11, 15, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  z-index: 1000;
}

.navbar-container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: #fff;
}

.logo-badge {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(160deg, #ff7a45, #ff4800);
  display: grid;
  place-items: center;
  font-family: var(--font-family-heading);
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.logo-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: #fff;
}

.logo-subtitle {
  font-size: var(--font-size-xs);
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-sm);
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  position: relative;
  transition: all var(--transition-fast);
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
}

.menu-toggle span::before { top: -6px; }
.menu-toggle span::after { top: 6px; }

.navbar-menu {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
  align-items: center;
  margin-left: auto;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color var(--transition-fast);
}

.navbar-link:hover,
.navbar-link.active {
  color: #fff;
}

.dropdown-toggle::after {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  margin-left: var(--spacing-xs);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  padding: var(--spacing-md);
  background: #11151a;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  border-left: 2px solid transparent;
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--font-size-sm);
}

.dropdown-item small {
  color: rgba(255, 255, 255, 0.5);
}

.dropdown-item:hover {
  border-left-color: var(--color-primary);
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.navbar-cta {
  margin-left: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-full);
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.08em;
}

@media (max-width: 980px) {
  .menu-toggle {
    display: block;
  }
  .navbar-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(8, 10, 14, 0.98);
    padding: var(--spacing-xl) var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
  }
  .navbar-menu.active {
    max-height: 600px;
  }
  .navbar-cta {
    width: 100%;
    text-align: center;
  }
}

/* ==================== Hero / 仓储展示 ==================== */
.hero {
  position: relative;
  padding: 160px 0 120px;
  background: var(--gradient-warehouse);
  color: #fff;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.18), transparent 55%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-2xl);
  align-items: center;
}

.hero-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-5xl);
  line-height: 1.05;
  margin-bottom: var(--spacing-lg);
}

.hero-desc {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--spacing-xl);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.stat {
  min-width: 140px;
}

.stat strong {
  display: block;
  font-size: 32px;
  color: #fff;
}

.stat span {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.12em;
}

.warehouse-visual {
  background: rgba(13, 16, 22, 0.65);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.shelf-level {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.shelf-level:last-child {
  margin-bottom: 0;
}

.shelf-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.07);
  min-height: 90px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.shelf-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-shelf);
}

.shelf-card span {
  position: relative;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
}

.page-hero {
  background: linear-gradient(135deg, #10151f 0%, #181f2b 55%, #ff5722 120%);
  color: #fff;
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.12), transparent 60%);
}

.page-hero h1 {
  font-size: var(--font-size-4xl);
  color: #fff;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.78);
  max-width: 720px;
}

/* ==================== 卡片 / 模块 ==================== */
.card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid rgba(15, 18, 24, 0.06);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  pointer-events: none;
}

.card h3 {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-2xl);
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--color-text-secondary);
}

.card img {
  margin-top: var(--spacing-lg);
  border-radius: var(--border-radius-md);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.badge-hot {
  background: rgba(255, 87, 34, 0.12);
  color: var(--color-primary);
}

/* ==================== 产品网格 / 快速筛选 ==================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-xl);
}

.product-card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border-light);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.product-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.product-meta {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.filter-panel {
  background: #fff;
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.filter-chip {
  border: 1px solid var(--color-border-light);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-full);
  background: #fff;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-chip.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ==================== 库存热力图 ==================== */
.heatmap-panel {
  background: #0f141c;
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-2xl);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--spacing-md);
}

.heatmap-cell {
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-left: 6px solid var(--heat-color, rgba(255, 255, 255, 0.2));
  position: relative;
  overflow: hidden;
}

.heatmap-cell::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent);
  pointer-events: none;
}

.heatmap-cell strong {
  display: block;
  color: #fff;
  font-size: var(--font-size-lg);
}

.heatmap-value {
  font-size: 28px;
  font-weight: 700;
}

/* ==================== 计算器 / 表单 ==================== */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
}

.calculator-card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border-light);
  padding: var(--spacing-xl);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

input, select, textarea {
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  background: #fff;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.15);
}

.result-box {
  background: var(--color-surface-muted);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  font-weight: 600;
  color: var(--color-primary);
}

/* ==================== 时间轴 / 物流 ==================== */
.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-xl);
}

.timeline-item {
  position: relative;
  padding-left: var(--spacing-lg);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 10px rgba(255, 87, 34, 0.1);
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 18px;
  width: 2px;
  height: calc(100% - 18px);
  background: rgba(0, 0, 0, 0.08);
}

.timeline-item:last-child::after {
  display: none;
}

/* ==================== 面包屑 ==================== */
.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
}

.breadcrumb-item {
  color: var(--color-concrete);
}

.breadcrumb-item a {
  color: var(--color-secondary);
  font-weight: 600;
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  margin-left: var(--spacing-sm);
  color: var(--color-concrete);
}

/* ==================== 表格 ==================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-2xl);
  overflow: hidden;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

th {
  background: #0f141c;
  color: #fff;
  font-weight: 500;
  padding: var(--spacing-md);
}

td {
  background: #fff;
  padding: var(--spacing-md);
  border-bottom: 1px solid #eef1f4;
}

tr:nth-child(even) td {
  background: #fafbfc;
}

/* ==================== 页脚 ==================== */
.footer {
  background: #0b0d11;
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  margin-top: var(--spacing-3xl);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer h3 {
  color: #fff;
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.footer ul {
  list-style: none;
  margin: 0;
}

.footer li {
  margin-bottom: var(--spacing-sm);
}

.footer a {
  color: rgba(255, 255, 255, 0.7);
}

.footer a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

/* ==================== 其他 ==================== */
main {
  margin-top: 96px;
  min-height: calc(100vh - 140px);
}

.highlight-list {
  list-style: none;
  padding-left: 0;
}

.highlight-list li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.highlight-list li::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  color: #555a64;
  font-style: italic;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 42px;
    --font-size-4xl: 32px;
    --font-size-3xl: 26px;
  }
  .hero {
    padding-top: 140px;
  }
  .hero .container {
    grid-template-columns: 1fr;
  }
  .warehouse-visual {
    order: -1;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-xl: 24px;
    --spacing-2xl: 36px;
    --spacing-3xl: 56px;
  }
  section {
    padding: var(--spacing-2xl) 0;
  }
  .navbar-container {
    flex-wrap: wrap;
  }
  .logo-subtitle {
    letter-spacing: 0.1em;
  }
}

/* ==================== 打印 ==================== */
@media print {
  .navbar,
  .footer {
    display: none;
  }
  body {
    background: #fff;
  }
}