/* ==========================================================================
   📱 GIAODIENHTML.CSS - MODERN MOBILE FIRST DESIGN
   ========================================================================== */

/* --- 1. RESET & BASE (MOBILE FIRST) --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Nền gradient hiện đại */
  background: linear-gradient(135deg, #f5f7fa 0%, #e8f0fe 100%);
  color: #1e293b;
  
  padding-top: 70px;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* --- 2. HERO SECTION (MOBILE) --- */
.hero-section {
  text-align: center;
  padding: 40px 20px 10px;
  width: 100%;
  max-width: 900px;
  animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-title {
  font-size: 35px;
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 16px 0;
  color: #1e293b;
  letter-spacing: -1px;
}

.text-gradient {
  background: linear-gradient(135deg, #2563eb 0%, #db2777 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.1rem;
  line-height: 1.6;
  color: #64748b;
  margin: 0 auto 24px;
  max-width: 600px;
  font-weight: 400;
}

/* Trust Badge Container */
.hero-badge-container {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-top: 20px;
  margin-bottom: 40px;
}

/* Base Badge Style */
.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  cursor: default;
  transition: all 0.2s ease;
  background: #ffffff;
  border: 1px solid #e2e8f0;
}
/* SVG Icon */
.trust-badge svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke-width: 2;
  fill: none;
  stroke: currentColor;
}
/* Hover Effect */
.trust-badge:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
/* FREE - Blue */
.trust-badge.free {
  color: #2563eb;
  background-color: #eff6ff;
  border-color: #bfdbfe;
}
/* FAST - Green */
.trust-badge.fast {
  color: #059669;
  background-color: #ecfdf5;
  border-color: #a7f3d0;
}
/* SECURE - Purple */
.trust-badge.secure {
  color: #7c3aed;
  background-color: #f5f3ff;
  border-color: #ddd6fe;
}

/* Animation */
.trust-badge { animation: fadeInUp 0.5s ease backwards; }
.trust-badge.free { animation-delay: 0.1s; }
.trust-badge.fast { animation-delay: 0.2s; }
.trust-badge.secure { animation-delay: 0.3s; }


@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}


/* --- 3. CONTAINER (MOBILE FIRST) --- */
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 30px 16px 40px;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.container a {
  text-decoration: none;
  display: block;
  width: 100%;
  max-width: 300px;
}

/* --- 4. GAME CARD (MOBILE - Ô VUÔNG NHỎ GỌN) --- */
.game-card {
  /* Card vuông trên mobile */
  width: 100%;
  max-width: 300px;
  padding: 22px 18px;
  
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  
  border-radius: 20px;
  
  /* Glass effect hiện đại với gradient nhẹ */
  background: linear-gradient(145deg, rgba(37, 99, 235, 0.08), rgba(99, 102, 241, 0.08));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: 0 20px 48px rgba(15, 23, 42, 0.08);
  
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

/* Hiệu ứng shine khi hover */
.game-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s ease;
}

.game-card:active::before {
  left: 100%;
}

/* Icon */
.game-card img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.08));
  margin-bottom: 14px;
  transition: transform 0.3s ease;
}

/* Text content */
.game-card p {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: #1e293b;
  letter-spacing: -0.01em;
}

/* Hover/Active states */
.game-card:hover,
.game-card:active {
  transform: translateY(-5px) scale(1.02);
  background: linear-gradient(145deg, rgba(37, 99, 235, 0.12), rgba(99, 102, 241, 0.12));
  box-shadow: 0 25px 55px rgba(15, 23, 42, 0.12);
  border-color: rgba(37, 99, 235, 0.25);
}

.game-card:hover img {
  transform: scale(1.08);
}

.game-card:active {
  transform: translateY(-2px) scale(0.98);
}

/* --- 5. FOOTER (MOBILE FIRST) --- */
.footer {
  width: 100%;
  background: #fff;
  border-top: 1px solid #e2e8f0;
  padding: 36px 20px 20px;
  margin-top: 40px;
  font-size: 13px;
  color: #64748b;
  animation: slideUp 0.5s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.footer-content {
  max-width: 1000px;
  margin: 0 auto;
  
  /* Mobile: Stack vertically */
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}

.footer-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 280px;
}

/* Footer Brand/Logo */
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.footer-logo {
  height: 90px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.05));
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 12.5px;
  line-height: 1.6;
  color: #94a3b8;
  max-width: 300px;
  margin: 0;
}

/* Column Title */
.footer-column h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #0f172a;
  margin-bottom: 8px;
}

/* Footer Links */
.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column ul li a {
  text-decoration: none;
  color: #64748b;
  transition: all 0.25s ease;
  display: inline-block;
  position: relative;
  font-weight: 500;
}

/* Underline effect on hover */
.footer-column ul li a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: #2563eb;
  transition: width 0.3s ease;
}

.footer-column ul li a:hover {
  color: #2563eb;
  transform: translateX(3px);
}

.footer-column ul li a:hover::after {
  width: 100%;
}

/* Footer Bottom */
.footer-bottom {
  border-top: 1px solid #f1f5f9;
  margin-top: 32px;
  padding-top: 18px;
  text-align: center;
  font-size: 11.5px;
  color: #cbd5e1;
}

.footer-bottom p {
  margin: 0;
}

/* ==========================================================================
   💻 TABLET & DESKTOP (min-width: 768px)
   ========================================================================== */
@media (min-width: 768px) {
  /* Hero Section Desktop */
  .hero-title {
    font-size: 3rem;
    margin-bottom: 20px;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }

  body {
    padding-top: 90px;
  }

  /* Container Desktop - 3 ô nằm ngang */
  .container {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 30px;
    padding: 40px 32px 50px;
  }

  .container a {
    width: auto;
    max-width: none;
  }

  /* CARD STYLE PC: Ô VUÔNG NHỎ GỌN (200px) */
  .game-card {
    width: 180px;
    height: 175px;
    max-width: none;
    padding: 20px 16px;
    gap: 12px;
  }

  .game-card img {
    width: 70px;
    height: 70px;
    margin-bottom: 10px;
  }

  .game-card p {
    font-size: 15px;
    font-weight: 600;
  }

  .game-card:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: 0 28px 60px rgba(15, 23, 42, 0.15);
  }

  /* FOOTER PC: 3 cột ngang */
  .footer {
    padding: 56px 40px 28px;
  }

  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    text-align: left;
    gap: 48px;
  }

  .footer-brand {
    flex: 2;
    align-items: flex-start;
    padding-right: 40px;
    max-width: 340px;
  }

  .footer-column {
    flex: 1;
    align-items: flex-start;
  }

  .footer-column ul li a:hover {
    transform: translateX(5px);
  }
}

/* ==========================================================================
   💻 LARGE DESKTOP (min-width: 1024px)
   ========================================================================== */
@media (min-width: 1024px) {
  .container {
    gap: 40px;
    padding: 50px 40px;
  }

  /* Card to hơn một chút trên màn hình lớn */
  .game-card {
    width: 200px;
    height: 185px;
    padding: 24px 18px;
  }

  .game-card img {
    width: 80px;
    height: 80px;
  }

  .game-card p {
    font-size: 16px;
  }
}

/* ==========================================================================
   🌙 DARK MODE
   ========================================================================== */
body.dark-mode {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #f1f5f9;
}

body.dark-mode .hero-title {
  color: #f1f5f9;
}

body.dark-mode .hero-subtitle {
  color: #94a3b8;
}

body.dark-mode .game-card {
  background: linear-gradient(145deg, rgba(30, 41, 59, 0.6), rgba(51, 65, 85, 0.6));
  border-color: rgba(148, 163, 184, 0.15);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.25);
}

body.dark-mode .game-card p {
  color: #f1f5f9;
}

body.dark-mode .game-card:hover {
  background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(51, 65, 85, 0.8));
  border-color: rgba(148, 163, 184, 0.3);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.35);
}

body.dark-mode .footer {
  background: #0f172a;
  border-top-color: #1e293b;
}

body.dark-mode .footer-column h4 {
  color: #f1f5f9;
}

body.dark-mode .footer-column ul li a {
  color: #94a3b8;
}

body.dark-mode .footer-column ul li a:hover {
  color: #60a5fa;
}

body.dark-mode .footer-column ul li a::after {
  background: #60a5fa;
}

body.dark-mode .footer-bottom {
  border-top-color: #1e293b;
  color: #475569;
}

/* Dark mode badge adjustments */
body.dark-mode .trust-badge {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(148, 163, 184, 0.2);
}

/* Free - Dark */
body.dark-mode .trust-badge.free { 
  background: rgba(37, 99, 235, 0.15); 
  border-color: rgba(37, 99, 235, 0.3);
  color: #60a5fa;
}

body.dark-mode .trust-badge.free:hover {
  background: rgba(37, 99, 235, 0.25);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
}

/* Fast - Dark */
body.dark-mode .trust-badge.fast { 
  background: rgba(16, 185, 129, 0.15); 
  border-color: rgba(16, 185, 129, 0.3);
  color: #34d399;
}

body.dark-mode .trust-badge.fast:hover {
  background: rgba(16, 185, 129, 0.25);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.2);
}

/* Secure - Dark */
body.dark-mode .trust-badge.secure { 
  background: rgba(139, 92, 246, 0.15); 
  border-color: rgba(139, 92, 246, 0.3);
  color: #a78bfa;
}

body.dark-mode .trust-badge.secure:hover {
  background: rgba(139, 92, 246, 0.25);
  box-shadow: 0 8px 20px rgba(139, 92, 246, 0.2);
}
/* ==========================================================================
   📱 RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* Small phones */
@media (max-width: 360px) {
  .container {
    padding: 25px 12px 35px;
  }

  .game-card {
    max-width: 280px;
    padding: 18px 14px;
  }
  
  .game-card img {
    width: 70px;
    height: 70px;
  }
  
  .game-card p {
    font-size: 14.5px;
  }

  /* Smaller badges on tiny screens */
  .trust-badge {
    font-size: 13px;
    padding: 8px 18px;
  }

  .hero-badge-container {
    gap: 10px;
  }
}

/* Medium phones and tablets */
@media (min-width: 481px) and (max-width: 768px) {
  .trust-badge {
    font-size: 14px;
    padding: 9px 20px;
  }
}