/* ============================================
   无限臀山 (Infinity Hip Mountain) - 主样式表
   CSS/ID前缀: ihm-
   ============================================ */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Anton&family=Roboto+Condensed:wght@300;400;700&display=swap');

/* ============================================
   CSS Variables
   ============================================ */
:root {
  --ihm-primary: #101010;
  --ihm-secondary: #E0E0E0;
  --ihm-accent: #D4AF37;
  --ihm-text: #F5F5F5;
  --ihm-link: #FAD02C;
  --ihm-dark-bg: #0a0a0a;
  --ihm-card-bg: #1a1a1a;
  --ihm-border: #2a2a2a;
  --ihm-gold-glow: rgba(212, 175, 55, 0.3);
  --ihm-font-heading: 'Anton', sans-serif;
  --ihm-font-body: 'Roboto Condensed', sans-serif;
  --ihm-radius: 8px;
  --ihm-transition: 0.3s ease;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--ihm-font-body);
  background-color: var(--ihm-primary);
  color: var(--ihm-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--ihm-link);
  text-decoration: none;
  transition: color var(--ihm-transition);
}

a:hover {
  color: var(--ihm-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--ihm-font-heading);
  color: var(--ihm-secondary);
  line-height: 1.2;
  letter-spacing: 1px;
}

/* ============================================
   干扰标签隐藏
   ============================================ */
.gym-block {
  display: none;
}

/* ============================================
   Container
   ============================================ */
.ihm-container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================
   Header / Navigation
   ============================================ */
#ihm-header {
  background-color: var(--ihm-primary);
  padding: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--ihm-border);
}

.ihm-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
  padding: 15px 20px;
}

.ihm-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ihm-logo img {
  height: 50px;
  width: auto;
}

.ihm-logo-text {
  font-family: var(--ihm-font-heading);
  font-size: 1.5rem;
  color: var(--ihm-accent);
  letter-spacing: 2px;
}

.ihm-nav-links {
  display: flex;
  list-style: none;
  gap: 0;
}

.ihm-nav-links li {
  position: relative;
}

.ihm-nav-links a {
  display: block;
  padding: 12px 24px;
  color: var(--ihm-secondary);
  font-family: var(--ihm-font-body);
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  transition: color var(--ihm-transition);
}

.ihm-nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ihm-accent), var(--ihm-link));
  transition: width var(--ihm-transition);
  border-radius: 2px;
}

.ihm-nav-links a:hover {
  color: var(--ihm-accent);
}

.ihm-nav-links a:hover::after {
  width: 80%;
}

.ihm-nav-links a.ihm-active {
  color: var(--ihm-accent);
}

.ihm-nav-links a.ihm-active::after {
  width: 80%;
}

/* Hamburger Menu */
.ihm-hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  padding: 10px;
  z-index: 1100;
}

.ihm-hamburger span {
  width: 28px;
  height: 3px;
  background-color: var(--ihm-accent);
  transition: all var(--ihm-transition);
  border-radius: 2px;
}

.ihm-hamburger.ihm-open span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.ihm-hamburger.ihm-open span:nth-child(2) {
  opacity: 0;
}

.ihm-hamburger.ihm-open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Sidebar */
.ihm-mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  z-index: 1050;
  opacity: 0;
  transition: opacity var(--ihm-transition);
}

.ihm-mobile-overlay.ihm-show {
  display: block;
  opacity: 1;
}

.ihm-mobile-nav {
  position: fixed;
  top: 0;
  right: -300px;
  width: 280px;
  height: 100%;
  background: var(--ihm-primary);
  border-left: 2px solid var(--ihm-accent);
  z-index: 1060;
  transition: right var(--ihm-transition);
  padding: 80px 30px 30px;
  overflow-y: auto;
}

.ihm-mobile-nav.ihm-show {
  right: 0;
}

.ihm-mobile-nav a {
  display: block;
  padding: 16px 0;
  color: var(--ihm-secondary);
  font-family: var(--ihm-font-body);
  font-weight: 700;
  font-size: 1.1rem;
  border-bottom: 1px solid var(--ihm-border);
  letter-spacing: 1px;
}

.ihm-mobile-nav a:hover {
  color: var(--ihm-accent);
}

/* ============================================
   Hero Section
   ============================================ */
#ihm-hero {
  position: relative;
  width: 100%;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.ihm-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.35);
  z-index: 1;
}

.ihm-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(16,16,16,0.3) 0%, rgba(16,16,16,0.8) 100%);
  z-index: 2;
}

.ihm-hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 40px 20px;
  max-width: 900px;
}

.ihm-hero-content h1 {
  font-size: 3.5rem;
  color: var(--ihm-accent);
  text-shadow: 0 0 40px var(--ihm-gold-glow);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.ihm-hero-content p {
  font-size: 1.3rem;
  color: var(--ihm-secondary);
  margin-bottom: 30px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.ihm-btn {
  display: inline-block;
  padding: 14px 40px;
  font-family: var(--ihm-font-body);
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  border: 2px solid var(--ihm-accent);
  color: var(--ihm-accent);
  background: transparent;
  border-radius: var(--ihm-radius);
  cursor: pointer;
  transition: all var(--ihm-transition);
  position: relative;
  overflow: hidden;
}

.ihm-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(212,175,55,0.2), transparent);
  transition: left 0.5s;
}

.ihm-btn:hover {
  background-color: var(--ihm-accent);
  color: var(--ihm-primary);
  box-shadow: 0 0 30px var(--ihm-gold-glow);
}

.ihm-btn:hover::before {
  left: 100%;
}

.ihm-btn-solid {
  background-color: var(--ihm-accent);
  color: var(--ihm-primary);
}

.ihm-btn-solid:hover {
  background-color: var(--ihm-link);
  border-color: var(--ihm-link);
}

/* ============================================
   Section Common
   ============================================ */
.ihm-section {
  padding: 80px 0;
}

.ihm-section-dark {
  background-color: var(--ihm-dark-bg);
}

.ihm-section-title {
  text-align: center;
  margin-bottom: 50px;
}

.ihm-section-title h2 {
  font-size: 2.5rem;
  color: var(--ihm-accent);
  margin-bottom: 15px;
  text-transform: uppercase;
}

.ihm-section-title p {
  font-size: 1.1rem;
  color: #999;
  max-width: 600px;
  margin: 0 auto;
}

.ihm-divider {
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--ihm-accent), var(--ihm-link));
  margin: 15px auto;
  border-radius: 2px;
}

/* ============================================
   Card Grid
   ============================================ */
.ihm-grid {
  display: grid;
  gap: 30px;
}

.ihm-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.ihm-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.ihm-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.ihm-card {
  background: var(--ihm-card-bg);
  border: 1px solid var(--ihm-border);
  border-radius: var(--ihm-radius);
  overflow: hidden;
  transition: transform var(--ihm-transition), box-shadow var(--ihm-transition);
}

.ihm-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 40px var(--ihm-gold-glow);
}

.ihm-card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.ihm-card-body {
  padding: 24px;
}

.ihm-card-body h3 {
  font-size: 1.3rem;
  color: var(--ihm-accent);
  margin-bottom: 10px;
}

.ihm-card-body p {
  font-size: 0.95rem;
  color: #bbb;
  margin-bottom: 15px;
}

.ihm-card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: #888;
}

.ihm-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(212, 175, 55, 0.15);
  color: var(--ihm-accent);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* ============================================
   Achievement / Before-After
   ============================================ */
.ihm-achievement-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.ihm-achievement-card {
  position: relative;
  border-radius: var(--ihm-radius);
  overflow: hidden;
}

.ihm-achievement-card img {
  width: 100%;
  height: 350px;
  object-fit: cover;
}

/* ============================================
   Challenge / Countdown
   ============================================ */
.ihm-countdown {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 30px 0;
}

.ihm-countdown-item {
  text-align: center;
  background: var(--ihm-card-bg);
  border: 1px solid var(--ihm-accent);
  border-radius: var(--ihm-radius);
  padding: 20px 25px;
  min-width: 90px;
}

.ihm-countdown-num {
  font-family: var(--ihm-font-heading);
  font-size: 2.5rem;
  color: var(--ihm-accent);
  display: block;
}

.ihm-countdown-label {
  font-size: 0.85rem;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   Leaderboard
   ============================================ */
.ihm-leaderboard {
  max-width: 700px;
  margin: 0 auto;
}

.ihm-leaderboard-row {
  display: flex;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--ihm-border);
  transition: background var(--ihm-transition);
}

.ihm-leaderboard-row:hover {
  background: rgba(212, 175, 55, 0.05);
}

.ihm-leaderboard-rank {
  font-family: var(--ihm-font-heading);
  font-size: 1.5rem;
  color: var(--ihm-accent);
  width: 50px;
  text-align: center;
}

.ihm-leaderboard-name {
  flex: 1;
  font-weight: 700;
  color: var(--ihm-secondary);
}

.ihm-leaderboard-score {
  color: var(--ihm-link);
  font-weight: 700;
}

/* ============================================
   APP Download Section
   ============================================ */
#ihm-app-section {
  position: relative;
  text-align: center;
  padding: 100px 0;
}

.ihm-app-content {
  position: relative;
  z-index: 3;
}

.ihm-app-content h2 {
  font-size: 2.5rem;
  color: var(--ihm-accent);
  margin-bottom: 15px;
}

.ihm-app-content p {
  font-size: 1.1rem;
  color: #bbb;
  margin-bottom: 30px;
}

.ihm-app-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */
#ihm-footer {
  background-color: var(--ihm-dark-bg);
  border-top: 2px solid var(--ihm-accent);
  padding: 60px 0 30px;
}

.ihm-footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.ihm-footer-col h4 {
  font-family: var(--ihm-font-heading);
  font-size: 1.2rem;
  color: var(--ihm-accent);
  margin-bottom: 20px;
  text-transform: uppercase;
}

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

.ihm-footer-col ul li {
  margin-bottom: 10px;
}

.ihm-footer-col ul li a {
  color: #999;
  font-size: 0.95rem;
  transition: color var(--ihm-transition);
}

.ihm-footer-col ul li a:hover {
  color: var(--ihm-accent);
}

.ihm-social-links {
  display: flex;
  gap: 15px;
  margin-bottom: 15px;
}

.ihm-social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--ihm-border);
  border-radius: 50%;
  color: var(--ihm-secondary);
  font-size: 1.1rem;
  transition: all var(--ihm-transition);
}

.ihm-social-links a:hover {
  border-color: var(--ihm-accent);
  color: var(--ihm-accent);
  box-shadow: 0 0 15px var(--ihm-gold-glow);
}

.ihm-footer-bottom {
  border-top: 1px solid var(--ihm-border);
  padding-top: 25px;
  text-align: center;
}

.ihm-footer-bottom p {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 8px;
}

.ihm-footer-bottom .ihm-age-badge {
  display: inline-block;
  padding: 4px 14px;
  border: 2px solid #c0392b;
  color: #c0392b;
  font-weight: 700;
  border-radius: 4px;
  margin-bottom: 10px;
  font-size: 0.9rem;
}

/* ============================================
   Page Header (Category pages)
   ============================================ */
.ihm-page-header {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.ihm-page-header-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.3);
}

.ihm-page-header-content {
  position: relative;
  z-index: 3;
  text-align: center;
}

.ihm-page-header-content h1 {
  font-size: 3rem;
  color: var(--ihm-accent);
  text-shadow: 0 0 30px var(--ihm-gold-glow);
  text-transform: uppercase;
}

.ihm-page-header-content p {
  font-size: 1.1rem;
  color: #ccc;
  margin-top: 10px;
}

/* ============================================
   Gallery Grid
   ============================================ */
.ihm-gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.ihm-gallery-item {
  position: relative;
  border-radius: var(--ihm-radius);
  overflow: hidden;
  cursor: pointer;
}

.ihm-gallery-item img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.ihm-gallery-item:hover img {
  transform: scale(1.08);
}

.ihm-gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  opacity: 0;
  transition: opacity var(--ihm-transition);
}

.ihm-gallery-item:hover .ihm-gallery-overlay {
  opacity: 1;
}

.ihm-gallery-overlay h3 {
  font-size: 1.1rem;
  color: var(--ihm-accent);
  margin-bottom: 5px;
}

.ihm-gallery-overlay p {
  font-size: 0.85rem;
  color: #ccc;
}

/* ============================================
   Content Article
   ============================================ */
.ihm-article {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px;
}

.ihm-article h2 {
  font-size: 1.8rem;
  color: var(--ihm-accent);
  margin: 40px 0 15px;
}

.ihm-article h3 {
  font-size: 1.4rem;
  color: var(--ihm-secondary);
  margin: 30px 0 12px;
}

.ihm-article p {
  margin-bottom: 18px;
  color: #ccc;
}

.ihm-article img {
  border-radius: var(--ihm-radius);
  margin: 25px 0;
}

/* ============================================
   APP Download Page
   ============================================ */
.ihm-app-page-hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.ihm-app-phone {
  max-width: 350px;
  margin: 30px auto;
  filter: drop-shadow(0 0 40px var(--ihm-gold-glow));
}

.ihm-download-links {
  display: flex;
  justify-content: center;
  gap: 25px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.ihm-download-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 30px;
  background: var(--ihm-card-bg);
  border: 2px solid var(--ihm-accent);
  border-radius: var(--ihm-radius);
  color: var(--ihm-secondary);
  font-size: 1rem;
  font-weight: 700;
  transition: all var(--ihm-transition);
}

.ihm-download-btn:hover {
  background: var(--ihm-accent);
  color: var(--ihm-primary);
  box-shadow: 0 0 30px var(--ihm-gold-glow);
}

.ihm-download-btn svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

/* ============================================
   Fitness Notice
   ============================================ */
.ihm-notice-box {
  background: var(--ihm-card-bg);
  border: 1px solid var(--ihm-accent);
  border-radius: var(--ihm-radius);
  padding: 30px;
  margin: 20px 0;
}

.ihm-notice-box h3 {
  color: var(--ihm-accent);
  margin-bottom: 15px;
}

.ihm-notice-list {
  list-style: none;
  padding: 0;
}

.ihm-notice-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--ihm-border);
  color: #ccc;
  padding-left: 25px;
  position: relative;
}

.ihm-notice-list li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--ihm-accent);
  font-weight: 700;
}

/* ============================================
   Breadcrumb
   ============================================ */
.ihm-breadcrumb {
  padding: 15px 0;
  font-size: 0.9rem;
}

.ihm-breadcrumb a {
  color: #888;
}

.ihm-breadcrumb a:hover {
  color: var(--ihm-accent);
}

.ihm-breadcrumb span {
  color: #666;
  margin: 0 8px;
}

/* ============================================
   Pagination
   ============================================ */
.ihm-pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.ihm-pagination a, .ihm-pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--ihm-border);
  border-radius: var(--ihm-radius);
  color: var(--ihm-secondary);
  font-weight: 700;
  transition: all var(--ihm-transition);
}

.ihm-pagination a:hover, .ihm-pagination .ihm-page-active {
  border-color: var(--ihm-accent);
  color: var(--ihm-accent);
  background: rgba(212, 175, 55, 0.1);
}

/* ============================================
   Responsive: Mobile First
   ============================================ */

/* Small devices (360px+) */
@media (max-width: 767px) {
  .ihm-nav-links {
    display: none;
  }

  .ihm-hamburger {
    display: flex;
  }

  .ihm-hero-content h1 {
    font-size: 2rem;
  }

  .ihm-hero-content p {
    font-size: 1rem;
  }

  .ihm-section {
    padding: 50px 0;
  }

  .ihm-section-title h2 {
    font-size: 1.8rem;
  }

  .ihm-grid-2,
  .ihm-grid-3,
  .ihm-grid-4 {
    grid-template-columns: 1fr;
  }

  .ihm-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .ihm-gallery-item img {
    height: 180px;
  }

  .ihm-footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .ihm-countdown {
    gap: 10px;
  }

  .ihm-countdown-item {
    padding: 15px 15px;
    min-width: 70px;
  }

  .ihm-countdown-num {
    font-size: 1.8rem;
  }

  .ihm-page-header {
    height: 280px;
  }

  .ihm-page-header-content h1 {
    font-size: 2rem;
  }

  .ihm-achievement-grid {
    grid-template-columns: 1fr;
  }
}

/* Tablets (768px+) */
@media (min-width: 768px) and (max-width: 1023px) {
  .ihm-nav-links {
    display: none;
  }

  .ihm-hamburger {
    display: flex;
  }

  .ihm-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .ihm-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .ihm-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .ihm-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .ihm-hamburger {
    display: none;
  }

  .ihm-nav-links {
    display: flex;
  }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  .ihm-container {
    padding: 0 40px;
  }
}

/* ============================================
   Scroll Animations
   ============================================ */
.ihm-fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   Utility Classes
   ============================================ */
.ihm-text-center {
  text-align: center;
}

.ihm-text-gold {
  color: var(--ihm-accent);
}

.ihm-mt-20 {
  margin-top: 20px;
}

.ihm-mt-40 {
  margin-top: 40px;
}

.ihm-mb-20 {
  margin-bottom: 20px;
}

.ihm-mb-40 {
  margin-bottom: 40px;
}