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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: #fbfaf9;
  color: #1e1e1e;
  line-height: 1.5;
}

/* ===== 自定义字体变量 & 配色 ===== */
:root {
  --porsche-red: #d5001c;
  --porsche-gold: #c9a96e;
  --porsche-blue: #1a3a5c;
  --porsche-cream: #faf3eb;
  --accent-gradient: linear-gradient(135deg, #d5001c 0%, #ff7a00 100%);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.3);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --font-weight-black: 900;
  --font-weight-thin: 300;
}

/* ===== 容器 & 区块 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section:nth-child(even) {
  background: #ffffff;
}

/* 区块装饰背景（动态流体） */
.section::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle at 30% 30%, rgba(213,0,28,0.03), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.section:nth-child(even)::before {
  background: radial-gradient(circle at 70% 80%, rgba(201,169,110,0.05), transparent 70%);
}

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.02);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: var(--font-weight-black);
  font-size: 1.3rem;
  text-decoration: none;
  color: #1e1e1e;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(213,0,28,0.25);
}

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

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: #3a3a3a;
  transition: color 0.2s, transform 0.2s;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s;
}

.main-nav a:hover {
  color: var(--porsche-red);
}

.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px;
  border-radius: 50px;
  background: var(--accent-gradient);
  color: #fff !important;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(213,0,28,0.3);
  transition: box-shadow 0.3s, transform 0.2s;
}

.nav-cta:hover {
  box-shadow: 0 6px 20px rgba(213,0,28,0.4);
  transform: translateY(-2px);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #1e1e1e;
}

/* ===== Hero ===== */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(175deg, #fff 0%, var(--porsche-cream) 100%);
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  right: -5%;
  top: -10%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(213,0,28,0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 680px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 20px;
  background: var(--accent-gradient);
  color: #fff;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3.6rem;
  font-weight: var(--font-weight-black);
  line-height: 1.1;
  margin-bottom: 16px;
  color: #1e1e1e;
  letter-spacing: -1px;
}

.hero h1 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  font-weight: var(--font-weight-thin);
  opacity: 0.8;
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-image {
  position: absolute;
  right: -2%;
  top: 50%;
  transform: translateY(-50%);
  width: 55%;
  max-width: 600px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  opacity: 0.85;
  z-index: 1;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.25s ease;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 16px rgba(213,0,28,0.3);
}

.btn-primary:hover {
  box-shadow: 0 8px 28px rgba(213,0,28,0.4);
  transform: translateY(-3px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--porsche-red);
  color: var(--porsche-red);
}

.btn-outline:hover {
  background: var(--porsche-red);
  color: #fff;
  transform: translateY(-3px);
}

/* ===== 标签/标题 ===== */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  margin-bottom: 16px;
  color: var(--porsche-gold);
  text-transform: uppercase;
  position: relative;
  padding-left: 20px;
}

.section-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--porsche-gold);
}

.section-title {
  font-size: 2.4rem;
  font-weight: var(--font-weight-black);
  margin-bottom: 16px;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 48px;
  font-weight: var(--font-weight-thin);
  font-size: 1.05rem;
}

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.category-card {
  border-radius: 16px;
  padding: 32px;
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.04);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  backdrop-filter: blur(4px);
  background: var(--glass-bg);
}

.category-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg);
  border-color: rgba(213,0,28,0.1);
}

.category-card:nth-child(1) .card-icon { background: linear-gradient(135deg, #ff7a00, #d5001c); }
.category-card:nth-child(2) .card-icon { background: linear-gradient(135deg, #1a3a5c, #3a7bd5); }
.category-card:nth-child(3) .card-icon { background: linear-gradient(135deg, #c9a96e, #f5e6b8); }
.category-card:nth-child(4) .card-icon { background: linear-gradient(135deg, #d5001c, #ff7a00); }

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--porsche-red);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s;
}

.card-link::after {
  content: '→';
  transition: transform 0.2s;
}

.card-link:hover {
  gap: 12px;
}

.card-link:hover::after {
  transform: translateX(4px);
}

/* ===== 特性块 ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature-image {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: perspective(1000px) rotateY(-2deg);
  transition: transform 0.4s;
}

.feature-image:hover {
  transform: perspective(1000px) rotateY(0deg);
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
}

.feature-text h3 {
  font-size: 1.8rem;
  font-weight: var(--font-weight-black);
  margin-bottom: 16px;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 400;
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

.feature-list li:last-child {
  border-bottom: none;
}

.feature-list li::before {
  content: '✓';
  font-weight: 700;
  color: var(--porsche-red);
  font-size: 1.2rem;
}

/* ===== 数据条 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
  position: relative;
}

.stat-item {
  padding: 32px 16px;
  border-radius: 16px;
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}

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

.stat-number {
  font-size: 2.6rem;
  font-weight: var(--font-weight-black);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 8px;
  font-weight: 500;
}

/* ===== 内容墙 ===== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.content-wall-item {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.04);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.4s;
}

.content-wall-item:hover img {
  transform: scale(1.05);
}

.content-wall-body {
  padding: 24px;
}

.content-wall-body h4 {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.content-wall-body p {
  opacity: 0.7;
  font-weight: var(--font-weight-thin);
  font-size: 0.95rem;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 14px;
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  background: #ffffff;
  transition: box-shadow 0.3s;
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #1e1e1e;
  background: var(--glass-bg);
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  transition: transform 0.3s;
  color: var(--porsche-red);
  font-weight: 300;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  opacity: 0.85;
  line-height: 1.6;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== CTA横幅 ===== */
.cta-banner {
  padding: 72px 32px;
  text-align: center;
  border-radius: 20px;
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 8px 32px rgba(213,0,28,0.3);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -20%;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2.2rem;
  font-weight: var(--font-weight-black);
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255,255,255,0.8);
  max-width: 500px;
  margin: 0 auto 32px;
  font-weight: var(--font-weight-thin);
}

.cta-banner .btn-primary {
  background: #ffffff;
  color: var(--porsche-red);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.cta-banner .btn-primary:hover {
  box-shadow: 0 6px 24px rgba(0,0,0,0.2);
  transform: translateY(-3px);
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 64px 0 32px;
  background: #1a1a1a; /* 深色但非纯黑，符合要求？背景禁止黑色，但页脚可用深灰色，且不算主要背景。如果严格禁止深色，可改为浅灰。但保时捷高端感常用深色页脚。为保险，改为浅灰： */
  background: #f5f3f0;
  color: #2e2e2e;
  border-top: 1px solid rgba(0,0,0,0.04);
}

.site-footer .container {
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand {
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-col h5 {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 16px;
  color: #1e1e1e;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  text-decoration: none;
  color: #4a4a4a;
  font-weight: 400;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--porsche-red);
}

.footer-bottom {
  border-top: 1px solid rgba(0,0,0,0.08);
  margin-top: 40px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.65;
}

/* ===== 工具类 ===== */
.text-accent {
  color: var(--porsche-red);
}

.text-center {
  text-align: center;
}

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  font-weight: var(--font-weight-thin);
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.8rem; }
  .hero-image { width: 45%; right: 0; }
}

@media (max-width: 768px) {
  .feature-block { grid-template-columns: 1fr; gap: 40px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .menu-toggle { background: none; border: none; font-size: 1.6rem; cursor: pointer; color: #1e1e1e; display: flex; align-items: center; }
  .main-nav.open { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; width: 100%; background: #ffffff; padding: 24px 32px; box-shadow: var(--shadow-lg); gap: 16px; }
  .main-nav.open a { font-size: 1.1rem; }
  .hero { min-height: 70vh; padding: 40px 0; }
  .hero-content { max-width: 100%; }
  .hero-image { position: relative; width: 100%; top: 0; transform: none; margin-top: 40px; }
  .section-title { font-size: 2rem; }
  .cta-banner h2 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; }
  .hero h1 { font-size: 2rem; }
  .stat-item { padding: 24px 12px; }
  .stat-number { font-size: 2rem; }
}