/* ============================
   HEITONE - Global Styles
   烈焰红橙金工业科技配色方案
   主色: 火焰红 #D4000A | 橙红 #E03D00 | 金橙 #F5A800
   ============================ */

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

:root {
  /* ── 品牌主色 ── */
  --primary:       #D4000A;      /* 火焰红 */
  --primary-dark:  #A80008;      /* 深红 */
  --primary-light: #FFF0F0;      /* 浅红背景 */
  --accent:        #F5A800;      /* 金橙强调 */
  --accent-dark:   #C47E00;      /* 深金 */
  --accent-light:  #FFF6E0;      /* 浅金背景 */

  /* ── 文字 ── */
  --text-primary:   #1A0A00;     /* 极深棕黑，代替纯黑更有温度 */
  --text-secondary: #4A3728;
  --text-muted:     #8A7060;

  /* ── 背景 ── */
  --bg-white:  #FFFFFF;
  --bg-light:  #FAF6F3;          /* 温暖米白 */
  --bg-gray:   #F3EDE8;          /* 温暖灰 */
  --bg-dark:   #130600;          /* 深炭红黑 */
  --bg-darker: #0A0200;          /* 极深底色 */

  /* ── 边框 ── */
  --border: #E8D8CE;

  /* ── 圆角 ── */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* ── 阴影 ── */
  --shadow-sm: 0 2px 8px rgba(80,10,0,0.08);
  --shadow-md: 0 4px 24px rgba(80,10,0,0.14);
  --shadow-lg: 0 8px 48px rgba(80,10,0,0.20);

  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --font: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  font-size: 15px;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================
   NAVBAR
   ============================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 0 6px rgba(212,0,10,0.45));
  transition: filter 0.3s, transform 0.3s;
}
.logo:hover .logo-img {
  filter: drop-shadow(0 0 12px rgba(245,168,0,0.7));
  transform: scale(1.08) rotate(-5deg);
}
.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 3px;
}

.nav-links {
  display: flex;
  gap: 4px;
}
.nav-link {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-actions { display: flex; align-items: center; gap: 12px; }
.btn-contact {
  padding: 8px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition);
}
.btn-contact:hover { background: var(--primary-dark); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================
   HERO
   ============================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: var(--bg-dark);
  padding-top: 68px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* 科技网格 - 用红橙色调 */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212,0,10,0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212,0,10,0.10) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* 烈焰光晕 - 右侧双色晕 */
.hero-glow {
  position: absolute;
  top: 10%;
  right: 5%;
  width: 700px;
  height: 700px;
  background:
    radial-gradient(ellipse at 70% 40%, rgba(245,168,0,0.22) 0%, transparent 50%),
    radial-gradient(ellipse at 30% 60%, rgba(212,0,10,0.25) 0%, transparent 60%);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 80px 24px;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid rgba(245,168,0,0.45);
  border-radius: 100px;
  font-size: 13px;
  color: #F5C84A;
  margin-bottom: 28px;
  letter-spacing: 2px;
}
.hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: blink 2s infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  color: #fff;
}
.title-line { display: block; }
.title-accent {
  /* 金橙渐变文字 */
  background: linear-gradient(90deg, #F5A800 0%, #E03D00 60%, #D4000A 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.hero-desc {
  font-size: 17px;
  color: rgba(255,255,255,0.60);
  margin-bottom: 40px;
  line-height: 1.9;
}

.hero-btns { display: flex; gap: 16px; margin-bottom: 64px; flex-wrap: wrap; }

.btn-primary {
  padding: 14px 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  display: inline-block;
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(245,168,0,0.25) 0%, transparent 60%);
  pointer-events: none;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(212,0,10,0.45);
}

.btn-outline {
  padding: 14px 32px;
  border: 1.5px solid rgba(245,168,0,0.45);
  color: #F5C84A;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  display: inline-block;
}
.btn-outline:hover {
  border-color: var(--accent);
  background: rgba(245,168,0,0.10);
  color: var(--accent);
}

.hero-stats {
  display: flex;
  gap: 0;
  align-items: center;
  flex-wrap: wrap;
}
.stat-item {
  padding: 0 32px 0 0;
  display: flex;
  flex-direction: column;
}
.stat-item:first-child { padding-left: 0; }
.stat-num {
  font-size: 36px;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.stat-unit { font-size: 18px; font-weight: 600; color: var(--accent); margin-left: 2px; }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.45); margin-top: 4px; }
.stat-divider { width: 1px; height: 44px; background: rgba(255,255,255,0.12); margin: 0 32px 0 0; }

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.35);
  font-size: 12px;
  letter-spacing: 1px;
}
.scroll-arrow { animation: bounce 2s infinite; font-size: 18px; }
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ============================
   SECTIONS
   ============================ */
.section { padding: 96px 0; }
.section-light { background: var(--bg-white); }
.section-dark  { background: var(--bg-dark); }
.section-gray  { background: var(--bg-gray); }

.section-header { text-align: center; margin-bottom: 64px; }
.section-header.light .section-title { color: #fff; }
.section-header.light .section-desc  { color: rgba(255,255,255,0.58); }

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-header.light .section-tag { color: var(--accent); }

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ============================
   PRODUCT CARDS (LASER)
   ============================ */
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 24px;
}
.product-grid-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
}
@media (max-width: 1024px) { .product-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px)  { .product-grid { grid-template-columns: 1fr; } .product-grid-two { grid-template-columns: 1fr; } }

.product-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.product-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.product-card:hover::after { transform: scaleX(1); }

/* 特色产品卡 - 深炭底 + 红橙渐变 */
.product-card.featured {
  background: linear-gradient(145deg, #200000 0%, #130600 100%);
  border: 1px solid rgba(212,0,10,0.35);
  color: #fff;
}
.product-card.featured::after { display: none; }
.product-card.featured:hover { box-shadow: 0 8px 32px rgba(212,0,10,0.35); }
.product-card.featured h3 { color: #fff; }
.product-card.featured p  { color: rgba(255,255,255,0.65); }
.product-card.featured .product-specs span  { color: rgba(255,255,255,0.45); }
.product-card.featured .product-specs strong { color: var(--accent); }

.product-icon {
  width: 52px; height: 52px;
  color: var(--primary);
  margin-bottom: 16px;
}
.product-card.featured .product-icon { color: var(--accent); }

.product-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(245,168,0,0.18);
  color: var(--accent);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.product-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.product-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.product-specs {
  list-style: none;
  margin-bottom: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 16px;
}
.product-card:not(.featured) .product-specs { border-top-color: var(--border); }
.product-specs li {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 6px 0;
}
.product-specs span   { color: var(--text-muted); }
.product-specs strong { color: var(--text-primary); }

.btn-card {
  display: block;
  text-align: center;
  padding: 10px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition);
}
.btn-card:hover { background: var(--primary-dark); }

.btn-card-outline {
  display: block;
  text-align: center;
  padding: 10px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-card-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ============================
   ROBOT SECTION (dark bg)
   ============================ */
.robot-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 768px) { .robot-layout { grid-template-columns: 1fr; } }

.feature-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}
.feature-item:last-child { border-bottom: none; }
.feature-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  min-width: 28px;
  padding-top: 2px;
}
.feature-body h4 { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.feature-body p  { font-size: 14px; color: rgba(255,255,255,0.52); line-height: 1.6; }
.feature-body strong { color: var(--accent); font-weight: 600; }
.feature-highlights {
  list-style: none;
  padding: 0;
  margin: 12px 0 0 0;
}
.feature-highlights li {
  font-size: 13px;
  color: rgba(255,255,255,0.38);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}
.feature-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 3px;
  background: var(--primary);
  opacity: 0.5;
}

.robot-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(212,0,10,0.22);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.robot-diagram { text-align: center; margin-bottom: 24px; }
.robot-diagram svg { width: 100%; max-width: 280px; height: auto; }

.robot-specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.rspec {
  background: rgba(255,255,255,0.05);
  border-radius: 8px;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.rspec span   { font-size: 12px; color: rgba(255,255,255,0.40); }
.rspec strong { font-size: 16px; font-weight: 600; color: var(--accent); }

/* ============================
   WELDING TABS
   ============================ */
.tab-buttons {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.tab-btn:hover  { border-color: var(--primary); color: var(--primary); }
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.tab-panel-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 48px;
}
@media (max-width: 768px) { .tab-panel-inner { grid-template-columns: 1fr; } }

.tab-info h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; }
.tab-info p  { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 24px; }

.spec-table { margin-bottom: 28px; }
.spec-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.spec-row:last-child { border-bottom: none; }
.spec-row span   { color: var(--text-muted); }
.spec-row strong { color: var(--text-primary); font-weight: 600; }

/* Tab 右侧视觉块 - 深底 + 红橙光圈 */
.tab-visual {
  min-height: 240px;
  border-radius: var(--radius-md);
  background: linear-gradient(145deg, #200000 0%, #130600 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  gap: 10px;
  position: relative;
  overflow: hidden;
}
.tab-visual::before {
  content: '';
  position: absolute;
  top: 20px; right: 20px;
  width: 130px; height: 130px;
  border: 2px solid rgba(212,0,10,0.30);
  border-radius: 50%;
}
.tab-visual::after {
  content: '';
  position: absolute;
  top: 55px; right: 55px;
  width: 60px; height: 60px;
  border: 2px solid rgba(245,168,0,0.45);
  border-radius: 50%;
}
.equip-badge {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(245,168,0,0.15);
  border: 1px solid rgba(245,168,0,0.30);
  color: #F5C84A;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  width: fit-content;
  position: relative;
  z-index: 1;
}

/* ============================
   CASES
   ============================ */

/* 视频号来源条 */
.cases-source {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 40px;
  font-size: 14px;
  color: var(--text-secondary);
}
.cases-source svg { flex-shrink: 0; color: var(--accent); }
.source-label { font-weight: 600; color: var(--text-primary); }
.source-divider { color: var(--border); }
.source-name { font-weight: 500; color: var(--primary); }
.source-link { margin-left: auto; color: var(--accent); text-decoration: none; font-weight: 500; transition: color var(--transition); }
.source-link:hover { color: var(--primary); }
@media (max-width: 640px) {
  .cases-source { flex-wrap: wrap; }
  .source-link { margin-left: 0; width: 100%; text-align: right; }
}

/* 主推案例 - 带真实截图 */
.case-featured {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 0;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 56px;
  transition: all var(--transition);
}
.case-featured:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}
@media (max-width: 768px) {
  .case-featured { grid-template-columns: 1fr; }
}

/* 左侧图片区域 */
.case-media {
  position: relative;
  background: #0A0200;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  min-height: 360px;
}
.case-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease, opacity 0.5s ease;
}
.case-featured:hover .case-img {
  transform: scale(1.04);
}
.case-play-btn {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 64px; height: 64px;
  background: rgba(212,0,10,0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.case-play-btn:hover {
  background: var(--primary);
  transform: translate(-50%, -50%) scale(1.12);
}
.case-play-btn svg { width: 22px; height: 22px; }

/* 右侧详情区域 */
.case-body {
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
@media (max-width: 768px) {
  .case-body { padding: 28px; }
}

.case-hashtags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.case-hashtags span {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(245,168,0,0.12);
  color: #C47E00;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.case-body h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}
.case-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
}

/* 数据指标行 */
.case-metrics-row {
  display: flex;
  gap: 28px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.case-stat {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.case-stat-icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 10px;
  color: var(--primary);
  flex-shrink: 0;
}
.case-stat strong { display: block; font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 2px; }
.case-stat span   { font-size: 12px; color: var(--text-muted); }

/* 分隔标签 */
.cases-section-label {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}
.label-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}
.label-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  white-space: nowrap;
}

/* 真实案例卡片网格 (2列) */
.cases-grid-real {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 768px) {
  .cases-grid-real { grid-template-columns: 1fr; }
}

.case-card-real {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.case-card-real:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

/* 卡片内图片容器 */
.case-card-img-wrap {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: #0A0200;
  position: relative;
  flex-shrink: 0;
}
.case-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.case-card-real:hover .case-card-img {
  transform: scale(1.06);
}

/* 卡片文字区域 */
.case-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.case-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 10px;
}
.case-card-tags span {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(245,168,0,0.12);
  color: #C47E00;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 500;
}
.case-card-body h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}
.case-card-body p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
  flex: 1;
}
.case-card-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.case-card-link:hover { color: var(--accent); }

/* ============================
   SERVICES
   ============================ */
.services-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 768px) { .services-layout { grid-template-columns: 1fr; } }

.timeline-step { display: flex; gap: 20px; align-items: flex-start; }
.step-circle {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(212,0,10,0.35);
}
.step-content { padding-bottom: 4px; }
.step-content h4 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.step-content p  { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

.timeline-connector {
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  opacity: 0.25;
  margin-left: 19px;
}

.service-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.svc-card {
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.svc-card:hover { border-color: var(--primary); background: var(--bg-white); box-shadow: var(--shadow-sm); }
.svc-icon { width: 40px; height: 40px; color: var(--primary); margin-bottom: 14px; }
.svc-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.svc-card p  { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

/* ============================
   ABOUT (dark bg)
   ============================ */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-bottom: 64px;
}
@media (max-width: 768px) { .about-layout { grid-template-columns: 1fr; } }

.about-story h3 { font-size: 20px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.about-story p  { font-size: 15px; color: rgba(255,255,255,0.58); line-height: 1.9; margin-bottom: 16px; }

.about-values { margin-top: 32px; display: flex; flex-direction: column; gap: 16px; }
.value-item { display: flex; gap: 14px; align-items: flex-start; }
.value-icon { font-size: 18px; color: var(--accent); padding-top: 2px; }
.value-item h5 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 2px; }
.value-item p  { font-size: 13px; color: rgba(255,255,255,0.45); }

.about-milestones h3 { font-size: 20px; font-weight: 600; color: #fff; margin-bottom: 24px; }
.milestone {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.milestone:last-child { border-bottom: none; }
.m-year   { font-size: 14px; font-weight: 700; color: var(--accent); min-width: 40px; padding-top: 1px; }
.m-event  { font-size: 14px; color: rgba(255,255,255,0.62); line-height: 1.5; }

.cert-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  padding-top: 48px;
  border-top: 1px solid rgba(255,255,255,0.07);
}
.cert-item {
  padding: 8px 20px;
  border: 1px solid rgba(212,0,10,0.28);
  border-radius: 6px;
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  font-weight: 500;
  transition: all var(--transition);
}
.cert-item:hover { border-color: var(--accent); color: var(--accent); }

/* ============================
   CONTACT
   ============================ */
.section-contact {
  background: var(--bg-light);
  padding: 96px 0;
}
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 768px) { .contact-layout { grid-template-columns: 1fr; } }

.contact-info h2 { font-size: 32px; font-weight: 700; margin-bottom: 14px; }
.contact-info > p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 32px; }

.contact-items { display: flex; flex-direction: column; gap: 20px; }
.contact-item  { display: flex; gap: 16px; align-items: flex-start; }
.c-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, rgba(212,0,10,0.12) 0%, rgba(245,168,0,0.10) 100%);
  color: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  border: 1px solid rgba(212,0,10,0.18);
}
.contact-item strong { display: block; font-size: 14px; color: var(--text-muted); margin-bottom: 2px; }
.contact-item p { font-size: 16px; font-weight: 600; color: var(--text-primary); margin: 0; }

.contact-form {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
@media (max-width: 480px) { .form-row { grid-template-columns: 1fr; } }

.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }
.form-group label { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-white);
  transition: border-color var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }

.btn-submit {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, #E03D00 100%);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.5px;
}
.btn-submit:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(212,0,10,0.40);
}

/* ============================
   FOOTER
   ============================ */
.footer {
  background: var(--bg-darker);
  color: rgba(255,255,255,0.55);
  padding-top: 64px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
@media (max-width: 640px) { .footer-inner { grid-template-columns: 1fr; } }

.footer-brand .logo       { margin-bottom: 16px; }
.footer-brand .logo-img   { width: 46px; height: 46px; filter: drop-shadow(0 0 8px rgba(212,0,10,0.5)); }
.footer-brand .logo-text  { color: #fff; }
.footer-brand > p { font-size: 14px; line-height: 1.7; margin-bottom: 20px; }

.footer-social { display: flex; gap: 12px; }
.social-link {
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
}
.social-link:hover { border-color: var(--accent); color: var(--accent); }

.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-col   { display: flex; flex-direction: column; gap: 10px; }
.footer-col h5 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 4px; }
.footer-col a  {
  font-size: 14px;
  color: rgba(255,255,255,0.48);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
}

/* footer 底部红线装饰 */
.footer-bottom::before {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), var(--accent), var(--primary), transparent);
  margin-bottom: 16px;
  opacity: 0.4;
}

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--bg-white);
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    z-index: 999;
    gap: 4px;
  }
  .hero-stats { gap: 0; }
  .stat-divider { margin: 0 16px 0 0; }
  .stat-item { padding-right: 16px; }
  .stat-num  { font-size: 28px; }
}