/* ========================================
   World Gym Equipment Guide - Styles
   ======================================== */

/* CSS Variables */
:root {
  /* Colors */
  --primary-dark: #0f0f1a;
  --secondary-dark: #1a1a2e;
  --accent-yellow: #ffd700;
  --accent-orange: #ff6b35;
  --accent-purple: #7b2cbf;
  --accent-cyan: #00d4ff;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.08);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-matrix: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-freeweight: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-hero: linear-gradient(
    180deg,
    rgba(15, 15, 26, 0) 0%,
    rgba(15, 15, 26, 0.8) 50%,
    #0f0f1a 100%
  );

  /* Spacing */
  --section-padding: 6rem 2rem;
  --card-padding: 2rem;
  --border-radius: 20px;
  --border-radius-sm: 12px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans TC", -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--primary-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: radial-gradient(
      circle at 20% 80%,
      rgba(123, 44, 191, 0.3) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(0, 212, 255, 0.2) 0%,
      transparent 50%
    ),
    var(--primary-dark);
  padding: 2rem;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  pointer-events: none;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  background: rgba(15, 15, 26, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
}

.brand-icon {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width var(--transition-normal);
}

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

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

/* Hero Content */
.hero-content {
  text-align: center;
  z-index: 10;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 500px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2.5rem;
  background: var(--gradient-primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  border-radius: 50px;
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  box-shadow: 0 4px 30px rgba(102, 126, 234, 0.4);
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(102, 126, 234, 0.6);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(10px);
  }
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
}

/* ========================================
   Section Styles
   ======================================== */
.section {
  padding: var(--section-padding);
  max-width: 1400px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.section h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

.yellow-text {
  color: var(--accent-yellow);
  font-weight: 600;
}

/* ========================================
   Equipment Cards
   ======================================== */
.equipment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.equipment-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: var(--card-padding);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.equipment-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-matrix);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.equipment-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.2);
}

.equipment-card:hover::before {
  opacity: 1;
}

/* Card Variant for Free Weight Section */
.card-variant::before {
  background: var(--gradient-freeweight);
}

/* Card Header */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.card-number {
  font-size: 3rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.08);
  line-height: 1;
}

.card-badge {
  padding: 0.375rem 1rem;
  background: var(--gradient-matrix);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-alt {
  background: var(--gradient-freeweight);
}

/* Card Content */
.equipment-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
}

/* Video Container */
.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  margin-bottom: 1.5rem;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
}

.video-container.video-short {
  padding-bottom: 177.78%; /* 9:16 aspect ratio for shorts */
  max-width: 200px;
  margin-left: auto;
  margin-right: auto;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--border-radius-sm);
}

.card-section {
  margin-bottom: 1.25rem;
}

.card-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.card-section p {
  font-size: 0.9375rem;
  color: var(--text-primary);
  line-height: 1.7;
}

/* Video Link */
.video-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: rgba(240, 147, 251, 0.15);
  border: 1px solid rgba(240, 147, 251, 0.3);
  border-radius: var(--border-radius-sm);
  color: #f093fb;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all var(--transition-normal);
  margin-top: 0.5rem;
}

.video-link:hover {
  background: rgba(240, 147, 251, 0.25);
  border-color: rgba(240, 147, 251, 0.5);
  transform: translateX(5px);
}

.link-alt {
  background: rgba(79, 172, 254, 0.15);
  border-color: rgba(79, 172, 254, 0.3);
  color: #4facfe;
}

.link-alt:hover {
  background: rgba(79, 172, 254, 0.25);
  border-color: rgba(79, 172, 254, 0.5);
}

.play-icon {
  font-size: 0.75rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  text-align: center;
  padding: 4rem 2rem;
  border-top: 1px solid var(--card-border);
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(123, 44, 191, 0.1) 100%
  );
}

.footer-content p {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.footer-note {
  font-size: 0.875rem !important;
  color: var(--text-muted) !important;
  font-weight: 400 !important;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
  .navbar {
    padding: 1rem 1.5rem;
  }

  .nav-links {
    gap: 1rem;
    font-size: 0.875rem;
  }

  .section {
    padding: 4rem 1.5rem;
  }

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

  .equipment-card {
    padding: 1.5rem;
  }

  .card-number {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .nav-brand .brand-text {
    display: none;
  }

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

  .hero-subtitle {
    font-size: 1rem;
  }

  .section h2 {
    font-size: 1.75rem;
  }
}

/* ========================================
   Animations on Scroll
   ======================================== */
.equipment-card {
  opacity: 0;
  transform: translateY(30px);
  animation: cardFadeIn 0.6s ease-out forwards;
}

.equipment-card:nth-child(1) {
  animation-delay: 0.1s;
}
.equipment-card:nth-child(2) {
  animation-delay: 0.2s;
}
.equipment-card:nth-child(3) {
  animation-delay: 0.3s;
}
.equipment-card:nth-child(4) {
  animation-delay: 0.1s;
}
.equipment-card:nth-child(5) {
  animation-delay: 0.2s;
}
.equipment-card:nth-child(6) {
  animation-delay: 0.3s;
}
.equipment-card:nth-child(7) {
  animation-delay: 0.4s;
}
.equipment-card:nth-child(8) {
  animation-delay: 0.1s;
}
.equipment-card:nth-child(9) {
  animation-delay: 0.2s;
}
.equipment-card:nth-child(10) {
  animation-delay: 0.3s;
}

@keyframes cardFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}