/* ===== 全局 ===== */
:root {
  --primary: #ff6b35;
  --primary-dark: #e65100;
  --dark: #0d0d0d;
  --dark2: #1a1a1a;
  --dark3: #2d2d2d;
  --light: #ffffff;
  --gray: #b0b0b0;
  --accent: #f7931e;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--dark);
  color: var(--light);
  line-height: 1.7;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

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

.section { padding: 100px 0; }
.section-dark { background: var(--dark2); }

.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block; color: var(--primary);
  font-size: 14px; font-weight: 600; letter-spacing: 3px;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
}
.section-header h2 .em,
.section-header h2 em { color: var(--primary); font-style: normal; }

/* ===== 导航 ===== */
#header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000; transition: var(--transition);
}
#header.scrolled {
  background: rgba(13,13,13,0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 30px rgba(0,0,0,0.3);
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 18px 24px;
}

.nav-brand { display: flex; align-items: center; gap: 8px; font-size: 22px; font-weight: 800; }
.brand-logo { font-size: 28px; }
.brand-cn { color: var(--primary); }

.nav-links { display: flex; gap: 32px; }
.nav-links a {
  font-size: 15px; color: var(--light);
  position: relative; padding: 4px 0;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--primary); }
.nav-links a::after {
  content: ""; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px; background: var(--primary);
  transition: width var(--transition);
}
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: var(--primary); color: #fff;
  padding: 10px 24px; border-radius: 30px;
  font-size: 14px; font-weight: 600;
  transition: var(--transition);
}
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-2px); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 5px; }
.nav-toggle span { width: 25px; height: 2px; background: var(--light); transition: var(--transition); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; position: relative;
  display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at top, rgba(255,107,53,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at bottom, rgba(247,147,30,0.1) 0%, transparent 60%),
    linear-gradient(180deg, #0a0a0a 0%, #1a1a1a 100%);
}
.hero-content { position: relative; z-index: 2; padding: 0 20px; }

.hero-badge {
  display: inline-block; color: var(--primary);
  font-size: 13px; letter-spacing: 4px; font-weight: 600;
  padding: 8px 20px; border: 1px solid rgba(255,107,53,0.3);
  border-radius: 30px; margin-bottom: 30px;
}
.hero-title {
  font-size: clamp(40px, 8vw, 80px);
  font-weight: 900; line-height: 1.1; margin-bottom: 24px;
  letter-spacing: -1px;
}
.hero-title .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--gray); margin-bottom: 40px;
}

.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px;
  font-size: 16px; font-weight: 600;
  cursor: pointer; transition: var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--primary); color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255,107,53,0.3);
}
.btn-outline {
  background: transparent; color: var(--light);
  border-color: rgba(255,255,255,0.3);
}
.btn-outline:hover {
  border-color: var(--primary); color: var(--primary);
  transform: translateY(-3px);
}

.hero-stats {
  display: flex; gap: 50px; justify-content: center;
  flex-wrap: wrap;
}
.hero-stats > div { text-align: center; }
.hero-stats strong {
  display: block; font-size: 36px; font-weight: 800;
  color: var(--primary);
}
.hero-stats span { font-size: 14px; color: var(--gray); }

.scroll-hint {
  position: absolute; bottom: 30px; left: 50%;
  transform: translateX(-50%);
  font-size: 24px; color: var(--gray);
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text p { margin-bottom: 20px; color: var(--gray); font-size: 16px; }
.about-text p strong { color: var(--light); }

.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
.feat { display: flex; gap: 14px; align-items: flex-start; }
.feat-icon { font-size: 28px; flex-shrink: 0; }
.feat h4 { font-size: 16px; margin-bottom: 4px; }
.feat p { font-size: 14px; color: var(--gray); }

.about-image .img-placeholder {
  width: 100%; height: 500px; border-radius: 20px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 80px; color: #fff;
}
.about-image .img-placeholder p { font-size: 18px; margin-top: 16px; }

/* ===== 课程卡片 ===== */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.course-card {
  background: var(--dark3); border-radius: 20px;
  padding: 36px 28px; position: relative;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
}
.course-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255,107,53,0.3);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.card-icon {
  width: 70px; height: 70px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; margin-bottom: 20px;
}
.course-card h3 { font-size: 22px; margin-bottom: 12px; }
.course-card > p { font-size: 14px; color: var(--gray); margin-bottom: 16px; }
.course-card ul { margin-bottom: 20px; }
.course-card li { font-size: 14px; color: var(--light); padding: 4px 0; }
.course-card li::before { content: "→ "; color: var(--primary); }

.card-tag {
  position: absolute; top: 24px; right: 24px;
  background: var(--primary); color: #fff;
  font-size: 12px; padding: 4px 12px; border-radius: 20px;
}

/* ===== 教练 ===== */
.trainer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.trainer-card {
  background: var(--dark2); border-radius: 20px;
  padding: 30px 24px; text-align: center;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.05);
}
.trainer-card:hover { transform: translateY(-6px); border-color: rgba(255,107,53,0.3); }

.trainer-avatar {
  width: 100px; height: 100px; border-radius: 50%;
  margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 44px;
}
.trainer-card h3 { font-size: 20px; margin-bottom: 6px; }
.trainer-card .trainer-role {
  color: var(--primary); font-size: 13px; display: block;
  margin-bottom: 12px;
}
.trainer-card p { font-size: 14px; color: var(--gray); }


.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.gallery-item {
  height: 220px; border-radius: 16px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 50px; cursor: pointer;
  transition: var(--transition);
}
.gallery-item:hover { transform: scale(1.03); }
.gallery-item p { font-size: 16px; margin-top: 12px; }

/* ===== CTA ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  padding: 80px 0; text-align: center;
}
.cta-banner h2 { font-size: clamp(24px, 4vw, 36px); margin-bottom: 16px; font-weight: 800; }
.cta-banner h2 span { text-decoration: underline; text-decoration-color: #fff; text-decoration-thickness: 3px; }
.cta-banner p { font-size: 18px; margin-bottom: 32px; color: rgba(255,255,255,0.9); }
.cta-banner .btn-primary { background: #fff; color: var(--primary); border-color: #fff; }
.cta-banner .btn-primary:hover { background: var(--dark); color: #fff; border-color: var(--dark); }

/* ===== 联系 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; }

.info-item { display: flex; gap: 16px; margin-bottom: 28px; }
.info-icon { font-size: 28px; flex-shrink: 0; }
.info-item h4 { font-size: 15px; color: var(--gray); margin-bottom: 4px; }
.info-item p { font-size: 16px; }

.contact-form-wrapper h3 { font-size: 22px; margin-bottom: 24px; }

.contact-form { display: flex; flex-direction: column; gap: 14px; }
.contact-form input,
.contact-form select,
.contact-form textarea {
  padding: 14px 18px; border-radius: 12px;
  background: var(--dark3); border: 1px solid rgba(255,255,255,0.1);
  color: var(--light); font-size: 15px;
  font-family: inherit; outline: none;
  transition: border-color var(--transition);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus { border-color: var(--primary); }
.contact-form select option { background: var(--dark2); }
.contact-form textarea { resize: vertical; }

.form-note { font-size: 13px; color: var(--gray); margin-top: 12px; }

/* ===== Footer ===== */
.footer { background: #000; padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-brand .brand-name { font-size: 24px; font-weight: 800; }
.footer-brand p { color: var(--gray); font-size: 14px; }
.footer-links h4 { font-size: 14px; margin-bottom: 16px; color: var(--light); letter-spacing: 1px; }
.footer-links a { display: block; color: var(--gray); font-size: 14px; padding: 4px 0; transition: color var(--transition); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.1); }
.footer-bottom p { color: var(--gray); font-size: 13px; }

/* ===== 悬浮按钮 ===== */
.floating-bar {
  position: fixed; bottom: 30px; right: 30px;
  display: flex; flex-direction: column; gap: 12px; z-index: 999;
}
.float-btn {
  width: 56px; height: 56px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  transition: var(--transition);
}
.float-phone { background: var(--primary); color: #fff; }
.float-wechat { background: #07c160; color: #fff; }
.float-btn:hover { transform: scale(1.1); }

.back-top {
  position: fixed; bottom: 30px; left: 30px;
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,0.1); color: var(--light);
  border: 1px solid rgba(255,255,255,0.2);
  font-size: 20px; cursor: pointer;
  opacity: 0; visibility: hidden;
  transition: var(--transition); z-index: 999;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary); border-color: var(--primary); }

/* ===== 滚动动画 ===== */
.course-card, .trainer-card, .price-card, .gallery-item, .info-item, .feat {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.course-card.animate-in, .trainer-card.animate-in, .price-card.animate-in,
.gallery-item.animate-in, .info-item.animate-in, .feat.animate-in {
  opacity: 1; transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .course-grid, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .trainer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .price-popular { transform: none; }
  .price-popular:hover { transform: translateY(-6px); }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 70%;
    height: 100vh; background: var(--dark);
    flex-direction: column; justify-content: center;
    gap: 24px; transition: right var(--transition);
    z-index: 1001; padding: 40px;
  }
  .nav-links.open { right: 0; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .about-features { grid-template-columns: 1fr; }
  .about-image .img-placeholder { height: 350px; }
  .course-grid, .pricing-grid, .trainer-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-stats { gap: 30px; }
}