/* ===== CSS Custom Properties ===== */
:root {
  --color-bg-primary: #0A0A0A;
  --color-bg-secondary: #111111;
  --color-bg-card: #1A1A1A;
  --color-bg-card-hover: #222222;
  --color-accent: #DC2626;
  --color-accent-light: #EF4444;
  --color-accent-dark: #B91C1C;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #A0A0A0;
  --color-text-muted: #666666;
  --color-border: #2A2A2A;
  --color-border-light: #333333;
  --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --max-width: 1200px;
  --header-height: 70px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 8px 30px rgba(220, 38, 38, 0.15);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

ul { list-style: none; }

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

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
  transition: all var(--transition-normal);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Scroll Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--color-text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.2rem;
  border-radius: var(--radius-sm);
}

.nav { display: flex; align-items: center; gap: 32px; }

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
  padding: 4px 0;
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.search-bar {
  display: flex;
  align-items: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 6px 14px;
  gap: 8px;
}

.search-bar input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text-primary);
  font-size: 0.85rem;
  width: 140px;
}

.search-bar input::placeholder {
  color: var(--color-text-muted);
}

.search-icon {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.btn-signin {
  background: var(--color-accent);
  color: white;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.btn-signin:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  padding: 4px;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition-normal);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  background: var(--color-bg-primary);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(220, 38, 38, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: rgba(220, 38, 38, 0.15);
  color: var(--color-accent-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
  border: 1px solid rgba(220, 38, 38, 0.3);
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-title .accent {
  color: var(--color-accent);
  display: block;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  max-width: 460px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--color-text-primary);
  color: var(--color-bg-primary);
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.btn-primary:hover {
  background: var(--color-accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(220, 38, 38, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary);
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 700;
  border: 2px solid var(--color-border-light);
  letter-spacing: 0.5px;
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-light);
  transform: translateY(-2px);
}

.hero-image {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image img {
  width: 100%;
  max-width: 550px;
  border-radius: var(--radius-lg);
  transform: rotate(-8deg);
  transition: transform var(--transition-slow);
  box-shadow: 0 20px 60px rgba(220, 38, 38, 0.15);
}

.hero-image:hover img {
  transform: rotate(0deg) scale(1.02);
}

.hero-image::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 40px;
  background: radial-gradient(ellipse, rgba(220, 38, 38, 0.2) 0%, transparent 70%);
  filter: blur(10px);
}

/* ===== Section Common ===== */
.section {
  padding: 100px 0;
}

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

.section-label {
  display: inline-block;
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* ===== Featured Products ===== */
.products {
  background: var(--color-bg-secondary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.product-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  position: relative;
}

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

.product-image {
  position: relative;
  height: 240px;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
  transition: transform var(--transition-normal);
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-heart {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.product-heart:hover {
  background: var(--color-accent);
  color: white;
  transform: scale(1.1);
}

.product-heart.liked {
  background: var(--color-accent);
  color: white;
}

.product-info {
  padding: 20px;
}

.product-category {
  font-size: 0.75rem;
  color: var(--color-accent-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
  margin-bottom: 6px;
}

.product-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.product-rating {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 12px;
}

.star { color: #FBBF24; font-size: 0.85rem; }
.star.empty { color: var(--color-text-muted); }

.rating-count {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-left: 6px;
}

.product-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.product-price {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text-primary);
}

.btn-add-cart {
  background: var(--color-accent);
  color: white;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.btn-add-cart:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
}

/* ===== Premium Collections ===== */
.premium {
  background: var(--color-bg-primary);
  position: relative;
  overflow: hidden;
}

.premium::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 30% 50%, rgba(220, 38, 38, 0.05) 0%, transparent 60%);
}

.premium .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.premium-image {
  position: relative;
}

.premium-image img {
  width: 100%;
  max-width: 450px;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.premium-image::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-accent), transparent, var(--color-accent));
  z-index: -1;
  opacity: 0.3;
}

.premium-content .section-label {
  text-align: left;
}

.premium-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.premium-desc {
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.stat-item {
  text-align: center;
  padding: 20px 10px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.stat-number {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-accent-light);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-collection {
  background: var(--color-accent);
  color: white;
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 700;
  display: inline-block;
}

.btn-collection:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(220, 38, 38, 0.3);
}

/* ===== Innovation Technology ===== */
.technology {
  background: var(--color-bg-secondary);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.tech-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition-normal);
}

.tech-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-hover);
}

.tech-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: rgba(220, 38, 38, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--color-accent-light);
  border: 1px solid rgba(220, 38, 38, 0.2);
  transition: all var(--transition-normal);
}

.tech-card:hover .tech-icon {
  background: var(--color-accent);
  color: white;
  transform: scale(1.1);
}

.tech-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.tech-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Elite Athletes ===== */
.athletes {
  background: var(--color-bg-primary);
  position: relative;
}

.athletes::before {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(220, 38, 38, 0.05) 0%, transparent 70%);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  position: relative;
  z-index: 1;
}

.testimonial-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-6px);
  border-color: rgba(220, 38, 38, 0.3);
  box-shadow: var(--shadow-hover);
}

.testimonial-quote {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: 12px;
  line-height: 1;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 20px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-accent);
  cursor: pointer;
}

.author-name {
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.author-name:hover {
  color: var(--color-accent-light);
}

.author-title {
  font-size: 0.8rem;
  color: var(--color-accent-light);
  font-weight: 500;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

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

.footer-desc {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 320px;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 38px;
  height: 38px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-text-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.footer-links a:hover {
  color: var(--color-accent-light);
  padding-left: 4px;
}

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

.copyright {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-bottom-links a:hover {
  color: var(--color-accent-light);
}

/* ===== Responsive: 1024px ===== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-subtitle { margin: 0 auto 36px; }
  .hero-buttons { justify-content: center; }
  .hero-image { order: -1; }
  .hero-image img { max-width: 400px; margin: 0 auto; }

  .premium .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .premium-image { display: flex; justify-content: center; }
  .premium-content .section-label { text-align: center; }

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

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ===== Responsive: 768px ===== */
@media (max-width: 768px) {
  .nav-links, .search-bar {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.6rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .products-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }

  .tech-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin: 0 auto;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-desc { margin: 0 auto 20px; }
  .social-links { justify-content: center; }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .premium-title {
    font-size: 2rem;
  }
}

/* ===== Mobile Nav Overlay ===== */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 10, 0.98);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.mobile-nav.active {
  display: flex;
}

.mobile-nav a {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

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

.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: transparent;
  color: var(--color-text-primary);
  font-size: 2rem;
}