/* ============================================================
   河南福安堂商贸有限公司 官网样式
   高端商务 · 深海军蓝 + 金色点缀
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：深海军蓝 */
  --navy-900: #050d1f;
  --navy-800: #0a1628;
  --navy-700: #0f1f3d;
  --navy-600: #1a2d52;
  --navy-500: #254373;

  /* 强调色：金 */
  --gold-500: #c9a24a;
  --gold-400: #d4b06a;
  --gold-300: #e2c890;
  --gold-gradient: linear-gradient(135deg, #c9a24a 0%, #e2c890 50%, #c9a24a 100%);

  /* 中性色 */
  --bg: #f8f9fc;
  --bg-alt: #ffffff;
  --text: #1a1f2e;
  --text-muted: #5a6478;
  --text-light: #8a93a6;
  --border: #e6e9f0;
  --border-light: #f0f2f7;

  /* 渐变 */
  --hero-gradient: linear-gradient(135deg, #050d1f 0%, #0a1628 40%, #0f1f3d 100%);
  --text-gradient: linear-gradient(135deg, #c9a24a 0%, #e2c890 100%);
  --card-shadow: 0 4px 24px rgba(10, 22, 40, 0.06);
  --card-shadow-hover: 0 16px 48px rgba(10, 22, 40, 0.12);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.5s;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--duration) var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--gold-gradient);
  color: var(--navy-900);
  box-shadow: 0 4px 16px rgba(201, 162, 74, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 162, 74, 0.45);
}
.btn-ghost {
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  color: #fff;
}
.btn-ghost:hover {
  border-color: var(--gold-400);
  color: var(--gold-300);
  background: rgba(201, 162, 74, 0.08);
}
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-block { width: 100%; }

.gradient-text {
  background: var(--text-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 头部导航 ---------- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(5, 13, 31, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--duration) var(--ease);
}
.header.scrolled {
  background: rgba(5, 13, 31, 0.95);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.logo-mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: var(--gold-gradient);
  color: var(--navy-900);
  border-radius: var(--radius-sm);
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  font-weight: 900;
}
.logo-text {
  color: #fff;
  font-size: 20px;
  letter-spacing: 2px;
}
.nav {
  display: flex;
  gap: 36px;
}
.nav-link {
  color: rgba(255, 255, 255, 0.75);
  font-size: 15px;
  font-weight: 400;
  position: relative;
  transition: color 0.3s;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px; left: 0;
  width: 0; height: 2px;
  background: var(--gold-gradient);
  transition: width 0.3s var(--ease);
}
.nav-link:hover, .nav-link.active {
  color: var(--gold-300);
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-cta { padding: 9px 22px; font-size: 14px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  background: var(--hero-gradient);
  overflow: hidden;
  display: flex;
  align-items: center;
  padding-top: 72px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 162, 74, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 162, 74, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
}
.glow-1 {
  width: 500px; height: 500px;
  background: var(--gold-500);
  top: -100px; right: -100px;
  opacity: 0.15;
}
.glow-2 {
  width: 400px; height: 400px;
  background: #254373;
  bottom: -100px; left: -100px;
  opacity: 0.5;
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  padding: 60px 24px;
}
.hero-content { color: #fff; }
.hero-badge {
  display: inline-block;
  padding: 8px 18px;
  background: rgba(201, 162, 74, 0.12);
  border: 1px solid rgba(201, 162, 74, 0.3);
  border-radius: 100px;
  color: var(--gold-300);
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 28px;
}
.hero-title {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-subtitle {
  font-size: clamp(16px, 2vw, 22px);
  color: var(--gold-300);
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 3px;
}
.hero-desc {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 520px;
  margin-bottom: 40px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.hero-stats .stat strong {
  display: block;
  font-size: 36px;
  font-weight: 900;
  color: var(--gold-400);
  font-family: 'Playfair Display', serif;
}
.hero-stats .stat span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}
.hero-visual {
  position: relative;
  height: 480px;
}
.hero-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  animation: float 6s ease-in-out infinite;
}
.card-1 { top: 20px; right: 40px; animation-delay: 0s; }
.card-2 { top: 180px; left: 0; animation-delay: 1.5s; }
.card-3 { bottom: 30px; right: 80px; animation-delay: 3s; }
.card-icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  background: rgba(201, 162, 74, 0.15);
  border-radius: var(--radius-sm);
  font-size: 24px;
}
.card-text h4 { color: #fff; font-size: 16px; margin-bottom: 2px; }
.card-text p { color: rgba(255, 255, 255, 0.55); font-size: 13px; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}
.scroll-hint {
  position: absolute;
  bottom: 30px; left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  text-align: center;
  z-index: 2;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--gold-400), transparent);
  margin: 8px auto 0;
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 通用板块 ---------- */
.section {
  padding: 110px 0;
  position: relative;
}
.section-head {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--gold-500);
  font-weight: 700;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 900;
  color: var(--navy-900);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.section-sub {
  font-size: 17px;
  color: var(--text-muted);
}

/* ---------- 关于我们 ---------- */
.about { background: var(--bg-alt); }
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}
.about-text p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 16px;
  line-height: 1.9;
}
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 32px;
}
.feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}
.feature-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold-gradient);
  flex-shrink: 0;
}
.about-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.about-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border-light);
  transition: all var(--duration) var(--ease);
}
.about-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--gold-300);
}
.about-card-main {
  grid-column: 1 / -1;
  background: var(--hero-gradient);
  color: #fff;
  border: none;
}
.about-card-num {
  font-family: 'Playfair Display', serif;
  font-size: 48px;
  font-weight: 900;
  color: var(--gold-400);
  line-height: 1;
  margin-bottom: 8px;
}
.about-card-label {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
}
.about-card-main .about-card-label { color: rgba(255,255,255,0.7); }
.about-card-sub .about-card-num { font-size: 36px; color: var(--navy-800); }
.about-card-sub .about-card-label { color: var(--text-muted); }
.about-card-bar {
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
  margin-top: 20px;
  overflow: hidden;
}
.about-card-fill {
  height: 100%;
  background: var(--gold-gradient);
  border-radius: 3px;
}

/* ---------- 核心业务 ---------- */
.services { background: var(--bg); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.service-card {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  border: 1px solid var(--border-light);
  transition: all var(--duration) var(--ease);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gold-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration) var(--ease);
}
.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--gold-300);
}
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(201,162,74,0.12), rgba(201,162,74,0.04));
  border-radius: var(--radius-md);
  font-size: 30px;
  margin-bottom: 22px;
  transition: transform var(--duration) var(--ease);
}
.service-card:hover .service-icon { transform: scale(1.1) rotate(-5deg); }
.service-card h3 {
  font-size: 22px;
  color: var(--navy-900);
  margin-bottom: 14px;
  font-weight: 700;
}
.service-card p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 20px;
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.service-tag {
  padding: 5px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  color: var(--navy-600);
}

/* ---------- 服务案例 ---------- */
.cases { background: var(--bg-alt); }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.case-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: all var(--duration) var(--ease);
}
.case-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}
.case-cover {
  height: 200px;
  background: var(--hero-gradient);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.case-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(201,162,74,0.2), transparent 60%);
}
.case-category {
  position: absolute;
  top: 16px; left: 16px;
  padding: 6px 14px;
  background: rgba(201, 162, 74, 0.9);
  color: var(--navy-900);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  z-index: 2;
}
.case-emoji {
  font-size: 64px;
  opacity: 0.4;
  z-index: 1;
}
.case-body { padding: 26px; }
.case-body h3 {
  font-size: 19px;
  color: var(--navy-900);
  margin-bottom: 12px;
  font-weight: 700;
}
.case-body p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 16px;
}
.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.case-tag {
  padding: 4px 12px;
  background: rgba(201, 162, 74, 0.08);
  color: var(--gold-500);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
}

/* ---------- 技术优势 ---------- */
.advantages { background: var(--bg); }
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.adv-card {
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  border: 1px solid var(--border-light);
  text-align: center;
  transition: all var(--duration) var(--ease);
}
.adv-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--gold-300);
}
.adv-icon {
  width: 72px; height: 72px;
  margin: 0 auto 22px;
  display: grid; place-items: center;
  background: var(--hero-gradient);
  border-radius: 50%;
  font-size: 32px;
  position: relative;
}
.adv-icon::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--gold-400);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}
.adv-card:hover .adv-icon::after { opacity: 0.5; }
.adv-card h3 {
  font-size: 20px;
  color: var(--navy-900);
  margin-bottom: 12px;
  font-weight: 700;
}
.adv-card p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 联系我们 ---------- */
.contact { background: var(--bg-alt); }
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
}
.contact-info h3, .contact-form-wrap h3 {
  font-size: 26px;
  color: var(--navy-900);
  margin-bottom: 28px;
  font-weight: 700;
}
.contact-list { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 20px;
  background: var(--bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all 0.3s;
}
.contact-item:hover {
  border-color: var(--gold-300);
  transform: translateX(6px);
}
.contact-icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  background: var(--gold-gradient);
  border-radius: var(--radius-sm);
  font-size: 22px;
  flex-shrink: 0;
}
.contact-label {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 4px;
}
.contact-value {
  font-size: 16px;
  color: var(--navy-900);
  font-weight: 500;
}
.form-desc {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 15px;
}
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: all 0.3s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--gold-400);
  box-shadow: 0 0 0 3px rgba(201, 162, 74, 0.12);
}
.form-group textarea { resize: vertical; }
.form-tip {
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.7);
  padding-top: 64px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
}
.footer-brand .logo { margin-bottom: 18px; }
.footer-brand p {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(255,255,255,0.5);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 20px;
  font-weight: 700;
}
.footer-col a, .footer-col span {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 12px;
  transition: color 0.3s;
}
.footer-col a:hover { color: var(--gold-300); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gold-gradient);
  color: var(--navy-900);
  font-size: 20px;
  font-weight: 700;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--duration) var(--ease);
  z-index: 99;
  box-shadow: 0 6px 20px rgba(201, 162, 74, 0.4);
}
.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top:hover { transform: translateY(-4px); }

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { height: 360px; }
  .services-grid, .cases-grid, .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .nav { display: none; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--navy-900);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .hero { min-height: auto; padding: 120px 0 80px; }
  .hero-stats { gap: 24px; }
  .hero-stats .stat strong { font-size: 28px; }
  .about-features { grid-template-columns: 1fr; }
  .services-grid, .cases-grid, .advantages-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom .container { flex-direction: column; gap: 8px; text-align: center; }
  .hero-visual { display: none; }
}

@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .footer-cols { grid-template-columns: 1fr; }
}