/* ===========================================
   XINNIU PLASTIC - Tech Modern Design System
   科技紫蓝配色 + 动感动画 + 玻璃态效果
   =========================================== */

/* CSS Variables - Enhanced Design System */
:root {
  /* Color Palette - Tech Purple Blue */
  --color-primary: #1a1a2e;          /* 深邃蓝黑 */
  --color-primary-light: #16213e;    /* 深蓝 */
  --color-accent: #6c63ff;           /* 电光紫 */
  --color-accent-light: #9d8fff;    /* 亮紫 */
  --color-secondary: #00d4ff;        /* 赛博蓝 */
  --color-gradient-1: #667eea;       /* 渐变紫 */
  --color-gradient-2: #764ba2;       /* 渐变深紫 */
  --color-bg: #0f0f1e;              /* 深色背景 */
  --color-bg-light: #1a1a2e;        /* 浅深色背景 */
  --color-bg-card: rgba(26, 26, 46, 0.8);  /* 玻璃态卡片 */
  --color-text: #ffffff;            /* 白色文字 */
  --color-text-muted: #b8b8d4;       /* 浅紫灰 */
  --color-border: rgba(108, 99, 255, 0.2);  /* 紫色边框 */

  /* Typography */
  --font-display: 'Oswald', sans-serif;
  --font-body: 'Source Sans Pro', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --max-width: 1400px;
  --header-height: 80px;

  /* Effects */
  --shadow-glow: 0 0 40px rgba(108, 99, 255, 0.3);
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.3);
  --blur-glass: blur(20px);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  background-image:
    radial-gradient(circle at 20% 50%, rgba(108, 99, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0, 212, 255, 0.08) 0%, transparent 50%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--color-accent);
  text-shadow: 0 0 20px rgba(108, 99, 255, 0.5);
}

/* Layout Utilities */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
  position: relative;
}

.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ===========================================
   HEADER & NAVIGATION - Glass Effect
   =========================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(15, 15, 30, 0.8);
  backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  padding-right: 0;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-right: auto;
}

.logo span {
  color: var(--color-accent);
  -webkit-text-fill-color: var(--color-accent);
}

.nav {
  display: flex;
  gap: 2.5rem;
  align-items: center;
  margin-left: 4rem;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  transition: width 0.3s ease;
  box-shadow: 0 0 10px var(--color-accent);
}

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

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  width: 25px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  transition: all 0.3s ease;
  border-radius: 2px;
}

@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(15, 15, 30, 0.98);
    backdrop-filter: var(--blur-glass);
    flex-direction: column;
    padding: var(--space-md);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  }

  .nav.active {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }
}

/* ===========================================
   HERO SECTION - Dynamic Gradient Background
   =========================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  background:
    linear-gradient(135deg, rgba(15, 15, 30, 0.92) 0%, rgba(22, 33, 62, 0.88) 100%),
    radial-gradient(circle at 30% 70%, rgba(108, 99, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(0, 212, 255, 0.12) 0%, transparent 50%),
    url('../images/products/ebike-1.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(108, 99, 255, 0.1) 0%, transparent 70%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-50px, 50px) rotate(180deg); }
}

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

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  max-width: 600px;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
  color: white;
  box-shadow: 0 10px 30px rgba(108, 99, 255, 0.4);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background: linear-gradient(135deg, rgba(108, 99, 255, 0.1), rgba(0, 212, 255, 0.1));
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* ===========================================
   FEATURES SECTION - Glass Cards
   =========================================== */

.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

.section-header p {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

.feature-card {
  background: var(--color-bg-card);
  backdrop-filter: var(--blur-glass);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  transform: translateY(-10px);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
  filter: drop-shadow(0 0 10px var(--color-accent));
}

.feature-card h3 {
  margin-bottom: var(--space-sm);
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===========================================
   PRODUCTS SECTION - Hover Effects
   =========================================== */

.products-preview {
  background: var(--color-bg);
}

.product-category {
  margin-bottom: var(--space-lg);
}

.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

.category-header h3 {
  margin-bottom: 0;
  color: var(--color-text);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.product-card {
  background: var(--color-bg-card);
  backdrop-filter: var(--blur-glass);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.product-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  transform: translateY(-5px);
}

.product-image {
  width: 100%;
  height: 250px;
  background: var(--color-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 1rem;
  transition: transform 0.5s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.1);
}

.product-info {
  padding: var(--space-sm);
}

.product-info h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

/* ===========================================
   EQUIPMENT SECTION
   =========================================== */

.equipment {
  background: var(--color-bg);
}

.equipment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-md);
}

.equipment-card {
  background: var(--color-bg-card);
  backdrop-filter: var(--blur-glass);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  border-radius: 16px;
  display: flex;
  gap: var(--space-md);
  align-items: center;
  transition: all 0.3s ease;
}

.equipment-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
  transform: translateX(5px);
}

.equipment-image {
  flex-shrink: 0;
  width: 150px;
  height: 150px;
  background: var(--color-bg-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.equipment-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 0.5rem;
}

.equipment-info h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.equipment-spec {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

/* ===========================================
   CTA Section - Gradient Background
   =========================================== */

.cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
  text-align: center;
  padding: var(--space-xl) 0;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(108, 99, 255, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(0, 212, 255, 0.15) 0%, transparent 50%);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.cta > * {
  position: relative;
  z-index: 1;
}

.cta h2 {
  color: white;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
}

.cta p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.125rem;
  margin-bottom: var(--space-md);
}

/* ===========================================
   FOOTER - Modern Style
   =========================================== */

.footer {
  background: var(--color-primary);
  color: white;
  padding: var(--space-lg) 0 var(--space-md);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer h4 {
  color: var(--color-text);
  font-size: 1rem;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer p,
.footer a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  transition: all 0.3s ease;
}

.footer a:hover {
  color: var(--color-accent);
  padding-left: 5px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ===========================================
   ANIMATIONS - Enhanced
   =========================================== */

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(108, 99, 255, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(108, 99, 255, 0.6);
  }
}

.fade-in {
  animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ===========================================
   RESPONSIVE
   =========================================== */

@media (max-width: 768px) {
  :root {
    --space-lg: 3rem;
    --space-xl: 4rem;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .equipment-card {
    flex-direction: column;
    text-align: center;
  }

  .equipment-image {
    width: 100%;
    height: 200px;
  }
}

/* ===========================================
   COOKIES BANNER - Bottom Fixed
   =========================================== */

.cookies-banner {
  position: fixed;
  bottom: -200px;
  left: 0;
  right: 0;
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: var(--blur-glass);
  padding: var(--space-md);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.5);
  z-index: 9999;
  transition: bottom 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.cookies-banner.show {
  bottom: 0;
}

.cookies-content {
  flex: 1;
  min-width: 300px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.cookies-content strong {
  color: var(--color-text);
}

.cookies-buttons {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.cookies-btn {
  padding: 0.75rem 1.5rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cookies-btn-accept {
  background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
  color: white;
}

.cookies-btn-accept:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.cookies-btn-decline {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.cookies-btn-decline:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .cookies-banner {
    flex-direction: column;
    text-align: center;
    padding: var(--space-sm);
  }

  .cookies-buttons {
    width: 100%;
    justify-content: center;
  }

  .cookies-btn {
    flex: 1;
    min-width: 120px;
  }
}

/* ===========================================
   WhatsApp Footer Button - Mobile Only
   =========================================== */

.whatsapp-btn {
  display: none; /* Hidden on desktop by default */
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: #25D366; /* WhatsApp brand green */
  color: #ffffff !important; /* Pure white - important to override any inherited styles */
  text-decoration: none;
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: var(--space-sm);
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  border: none;
  cursor: pointer;
  width: 100%;
  max-width: 280px;
}

.whatsapp-btn:hover {
  background: #20BA5A; /* Darker green on hover */
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
  color: #ffffff !important; /* Pure white on hover */
  text-decoration: none;
}

.whatsapp-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.whatsapp-btn .whatsapp-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  fill: #ffffff !important; /* Ensure icon is also pure white */
  color: #ffffff !important;
}

/* Show WhatsApp button only on mobile devices */
@media (max-width: 768px) {
  .whatsapp-btn {
    display: inline-flex;
  }
}