/* ============================================
   栖霞喜课咨询工作室 - 爱马仕橙主题
   ============================================ */

:root {
  --primary: #FF6A13;
  --primary-dark: #E85D04;
  --primary-light: #FF8C42;
  --primary-glow: rgba(255, 106, 19, 0.3);
  --bg-dark: #0A0A0A;
  --bg-card: #141414;
  --bg-light: #FAF7F2;
  --text-dark: #1A1A1A;
  --text-light: #FFFFFF;
  --text-muted: #8A8A8A;
  --border: rgba(255, 106, 19, 0.15);
  --gradient-primary: linear-gradient(135deg, #FF6A13 0%, #FF8C42 50%, #FFB366 100%);
  --gradient-dark: linear-gradient(180deg, #0A0A0A 0%, #1A1A1A 100%);
  --shadow-orange: 0 10px 40px rgba(255, 106, 19, 0.25);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* ============================================
   导航栏
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-light);
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gradient-primary);
  display: grid;
  place-items: center;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-light);
  box-shadow: var(--shadow-orange);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(255, 106, 19, 0.3); }
  50% { box-shadow: 0 0 35px rgba(255, 106, 19, 0.6); }
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-main {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav a {
  text-decoration: none;
  color: var(--text-light);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

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

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

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

.nav-cta {
  padding: 8px 20px;
  border-radius: 999px;
  background: var(--gradient-primary);
  color: var(--text-light) !important;
  font-weight: 600;
  box-shadow: var(--shadow-orange);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(255, 106, 19, 0.4);
}

.nav-cta::after {
  display: none;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-light);
  transition: all 0.3s ease;
}

/* ============================================
   首屏 Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.grid-bg {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 106, 19, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 106, 19, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
  0% { background-position: 0 0; }
  100% { background-position: 60px 60px; }
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orb-float 8s ease-in-out infinite;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  top: 10%;
  right: 10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
  bottom: 10%;
  left: 10%;
  animation-delay: 4s;
}

@keyframes orb-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  border-radius: 999px;
  background: rgba(255, 106, 19, 0.1);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--primary-light);
  margin-bottom: 32px;
  animation: fade-in-up 0.8s ease;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  animation: fade-in-up 1s ease 0.2s both;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 40px;
  animation: fade-in-up 1s ease 0.4s both;
}

.highlight {
  color: var(--primary);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
  animation: fade-in-up 1s ease 0.6s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 36px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-light);
  box-shadow: var(--shadow-orange);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 50px rgba(255, 106, 19, 0.5);
}

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

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(255, 106, 19, 0.1);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  animation: fade-in-up 1s ease 0.8s both;
}

.stat {
  text-align: center;
}

.stat-num {
  font-size: 36px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   通用区块
   ============================================ */
.section {
  padding: 100px 24px;
  position: relative;
}

.section:nth-child(even) {
  background: var(--bg-card);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 999px;
  background: rgba(255, 106, 19, 0.1);
  border: 1px solid var(--border);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   服务内容
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: var(--shadow-card);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  font-size: 40px;
  margin-bottom: 20px;
  display: inline-block;
  transition: transform 0.4s ease;
}

.service-card:hover .service-icon {
  transform: scale(1.2) rotate(5deg);
}

.service-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

/* ============================================
   为什么选我们
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
  position: relative;
  transition: all 0.4s ease;
}

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

.feature-num {
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 16px;
  display: block;
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* ============================================
   支持平台
   ============================================ */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  transition: all 0.4s ease;
}

.platform-card:hover {
  border-color: var(--primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-orange);
}

.platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 16px;
  background: rgba(255, 106, 19, 0.1);
  display: grid;
  place-items: center;
  transition: all 0.4s ease;
}

.platform-card:hover .platform-icon {
  background: var(--gradient-primary);
  transform: scale(1.1) rotate(5deg);
}

.platform-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--primary);
  transition: stroke 0.4s ease;
}

.platform-card:hover .platform-icon svg {
  stroke: var(--text-light);
}

.platform-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.platform-card p {
  color: var(--text-muted);
  font-size: 14px;
}

/* ============================================
   合作流程
   ============================================ */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  position: relative;
}

.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  position: relative;
  transition: all 0.4s ease;
}

.step:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient-primary);
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: 16px;
  box-shadow: var(--shadow-orange);
}

.step h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  color: var(--text-muted);
  font-size: 14px;
}

/* ============================================
   常见问题
   ============================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.faq-item.active {
  border-color: var(--primary);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: color 0.3s ease;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  font-size: 24px;
  font-weight: 300;
  transition: transform 0.3s ease;
  color: var(--primary);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer p {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.contact-item:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}

.contact-label {
  min-width: 80px;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(255, 106, 19, 0.1);
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
}

.contact-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  text-decoration: none;
}

.contact-value:hover {
  color: var(--primary);
}

.contact-hint {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 8px;
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
}

.contact-form-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-form-card > p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.contact-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
}

.step-row .step-num {
  width: 36px;
  height: 36px;
  font-size: 16px;
  margin-bottom: 0;
  box-shadow: none;
}

.step-row span:last-child {
  color: var(--text-muted);
  font-size: 14px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 60px 24px 30px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  padding-right: 80px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 16px;
}

@media (max-width: 768px) {
  .footer-bottom {
    padding-right: 24px;
    flex-direction: column;
    text-align: center;
  }
  .footer-bottom .icp {
    order: -1;
  }
}

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

.icp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 999px;
  background: rgba(255, 106, 19, 0.08);
  border: 1px solid var(--border);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: all 0.3s ease;
}

.icp:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255, 106, 19, 0.15);
}

.icp::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 106, 19, 0.2);
}

/* ============================================
   返回顶部
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  border: none;
  color: var(--text-light);
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-orange);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 40px rgba(255, 106, 19, 0.5);
}

/* ============================================
   滚动动画
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   核心功能
   ============================================ */
.features-list {
  background: var(--bg-card);
}

.feature-categories {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 60px;
}

.feature-category {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.feature-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.feature-category:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.feature-category:hover::before {
  transform: scaleX(1);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.category-icon {
  font-size: 36px;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: rgba(255, 106, 19, 0.1);
  display: grid;
  place-items: center;
  transition: all 0.4s ease;
  flex-shrink: 0;
}

.feature-category:hover .category-icon {
  background: var(--gradient-primary);
  transform: scale(1.1) rotate(5deg);
}

.category-header h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 4px;
}

.category-desc {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.feature-tag {
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 106, 19, 0.08);
  border: 1px solid var(--border);
  color: var(--primary-light);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: default;
}

.feature-tag:hover {
  background: rgba(255, 106, 19, 0.15);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

/* 痛点解决 */
.pain-points {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  text-align: center;
}

.pain-points h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 32px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  text-align: left;
}

.pain-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.pain-item:hover {
  background: rgba(255, 106, 19, 0.05);
  border: 1px solid var(--border);
}

.pain-num {
  font-size: 24px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  flex-shrink: 0;
  line-height: 1;
}

.pain-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-light);
}

.pain-item p {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
  margin: 0;
}

/* ============================================
   核心功能区块 - 重新排版
   ============================================ */

/* 6 大核心痛点 */
.pain-points {
  margin-bottom: 60px;
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.pain-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
}

.pain-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.pain-item:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-orange);
}

.pain-item:hover::before {
  transform: scaleX(1);
}

.pain-num {
  font-size: 36px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 12px;
  display: block;
}

.pain-item h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-light);
}

.pain-item p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

/* 16 大功能模块 - 4x4 网格 */
.features-grid-v2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card-v2 {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
}

.feature-card-v2::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.feature-card-v2:hover {
  border-color: var(--primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-orange);
}

.feature-card-v2:hover::before {
  transform: scaleX(1);
}

.feature-icon-v2 {
  font-size: 36px;
  margin-bottom: 16px;
  display: inline-block;
  transition: transform 0.4s ease;
}

.feature-card-v2:hover .feature-icon-v2 {
  transform: scale(1.2) rotate(5deg);
}

.feature-content-v2 {
  position: relative;
  z-index: 1;
}

.feature-content-v2 h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-light);
}

.feature-desc-v2 {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 16px;
  min-height: 42px;
}

.feature-tags-v2 {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-v2 {
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 106, 19, 0.08);
  border: 1px solid var(--border);
  color: var(--primary-light);
  font-size: 12px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.tag-v2:hover {
  background: rgba(255, 106, 19, 0.15);
  border-color: var(--primary);
  color: var(--primary);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }

  .nav.active {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-bottom .icp {
    order: -1;
  }

  /* 核心功能响应式 */
  .pain-grid {
    grid-template-columns: 1fr;
  }

  .features-grid-v2 {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .feature-card-v2 {
    padding: 20px;
  }

  .feature-icon-v2 {
    font-size: 28px;
    margin-bottom: 12px;
  }

  .feature-content-v2 h3 {
    font-size: 16px;
  }

  .feature-desc-v2 {
    font-size: 12px;
    min-height: 36px;
  }

  .tag-v2 {
    font-size: 11px;
    padding: 3px 10px;
  }
}

@media (max-width: 480px) {
  .features-grid-v2 {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .btn {
    padding: 14px 28px;
    font-size: 15px;
  }

  .section {
    padding: 60px 16px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .btn {
    padding: 14px 28px;
    font-size: 15px;
  }

  .section {
    padding: 60px 16px;
  }
}