/* Steam Daily Deals - Modern Design */

/* 字体优化：本地字体优先，支持中文 */
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: local('Space Grotesk'), 
       url('https://fonts.gstatic.com/s/spacegrotesk/v16/V8mDoQDjQSkFtoMM3T6r8E7mPb54C_k3HqU.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #232a3d;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent-gold: #fbbf24;
  --accent-blue: #3b82f6;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --border-color: #374151;
  --gradient-gold: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  --gradient-blue: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  /* 优化字体栈：西文字体 + 中文字体回退 */
  --font-main: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Background Pattern */
.bg-pattern {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(251, 191, 36, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  background: rgba(10, 14, 23, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.header-content {
  flex: 1;
  min-width: 200px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Navigation */
.nav {
  display: flex;
  gap: 0.5rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* Language Selector */
.lang-selector select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-selector select:hover {
  border-color: var(--accent-blue);
}

.lang-selector select:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Main Content */
.main {
  padding: 2rem 0 4rem;
}

/* Sections */
.section {
  margin-bottom: 3rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title .icon {
  font-size: 1.25rem;
}

.section-global .section-title {
  color: var(--accent-gold);
}

.section-regional .section-title {
  color: var(--accent-blue);
}

/* Region Flags */
.region-flags {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.region-flags .flag {
  font-size: 1.25rem;
  opacity: 0.8;
  transition: opacity 0.2s, transform 0.2s;
}

.region-flags .flag:hover {
  opacity: 1;
  transform: scale(1.2);
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cards-regional {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

@media (max-width: 992px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
}

/* Game Card */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-color);
  box-shadow: var(--shadow-lg);
}

.card-global {
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.card-global:hover {
  border-color: var(--accent-gold);
  box-shadow: 0 10px 30px rgba(251, 191, 36, 0.15);
}

.card-image {
  position: relative;
  aspect-ratio: 460/215;
  background: var(--bg-secondary);
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.discount-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--accent-green);
  color: white;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  box-shadow: var(--shadow-md);
}

.card-content {
  padding: 1.25rem;
}

.card-region {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.card-region .flag {
  font-size: 1.25rem;
}

.card-region .region-name {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-price {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.price-final {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-green);
}

.price-original {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

.btn-store {
  display: inline-block;
  width: 100%;
  text-align: center;
  padding: 0.75rem 1.5rem;
  background: var(--gradient-blue);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-store:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Error State */
.error {
  text-align: center;
  padding: 2rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  color: var(--accent-red);
}

.error button {
  margin-top: 1rem;
  padding: 0.5rem 1.5rem;
  background: var(--accent-red);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: opacity 0.2s;
}

.error button:hover {
  opacity: 0.9;
}

/* No Data */
.no-data {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

/* Footer */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

/* History Page */
.history-section {
  margin-bottom: 3rem;
}

.history-date {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.load-more-btn {
  display: block;
  width: 100%;
  max-width: 300px;
  margin: 2rem auto 0;
  padding: 0.875rem 2rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.load-more-btn:hover {
  background: var(--bg-card);
  border-color: var(--accent-blue);
}

/* About Page */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 0;
}

.about-content h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.about-content h2 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}

.about-content ul {
  list-style: none;
  padding: 0;
}

.about-content li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.about-content li::before {
  content: '✓';
  color: var(--accent-green);
}

/* Responsive */
@media (max-width: 768px) {
  .header .container {
    flex-direction: column;
    text-align: center;
  }
  
  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }
  
  .lang-selector {
    order: 2;
  }
  
  .section-header {
    flex-direction: column;
    text-align: center;
  }
  
  .logo {
    font-size: 1.25rem;
  }
}