:root {
  /* Theme hiệp sĩ: xanh hoàng gia + vàng */
  --bg-dark: #050814;
  --bg-darker: #02040a;
  --bg-card: #0c1224;
  --bg-card-hover: #151d35;
  --primary-color: #4aa8ff; /* xanh kiếm sĩ */
  --primary-hover: #74c0ff;
  --secondary-color: #ffd84a; /* vàng giáp */
  --text-primary: #ffffff;
  --text-secondary: #d0dcff;
  --text-muted: #8b92b3;
  --border-color: #273459;
  --border-gold: #ffd84a;
  --shadow-glow: 0 0 20px rgba(116, 192, 255, 0.35);
  --shadow-glow-strong: 0 0 35px rgba(116, 192, 255, 0.65);

  /* Biến màu riêng cho trang bảng xếp hạng */
  --rank-bg-main: #050814;
  --rank-bg-card: #0c1224;
  --rank-accent: var(--secondary-color);      /* vàng hiệp sĩ */
  --rank-accent-2: var(--primary-color);      /* xanh hiệp sĩ */
  --rank-accent-3: #9cc5ff;                   /* xanh nhạt */
  --rank-accent-4: #ffe9a3;                   /* vàng nhạt */
  --rank-text-main: var(--text-primary);
  --rank-text-muted: var(--text-muted);
  --rank-border-soft: rgba(255, 255, 255, 0.12);
  --rank-row-top1: rgba(255, 216, 74, 0.16);
  --rank-row-top2: rgba(74, 168, 255, 0.18);
  --rank-row-top3: rgba(156, 197, 255, 0.14);
  --rank-glass-dark: rgba(9, 11, 30, 0.75);
}

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

html {
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  font-size: 16px;
  background: radial-gradient(circle at top, #1f2b4f 0%, #050814 40%, #02040a 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  position: relative;
}

/* ============================
   BẢNG XẾP HẠNG (RANK PAGE)
   ============================ */

.rank-page {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(74, 168, 255, 0.32), transparent 55%),
    radial-gradient(circle at bottom, rgba(255, 216, 74, 0.18), transparent 55%),
    linear-gradient(180deg, #020617, #050814);
  color: var(--rank-text-main);
  min-height: 100vh;
  padding: 32px 12px 40px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.rank-page .page-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.rank-page .page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  gap: 12px;
  padding: 6px 2px 8px;
}

.rank-page .page-title {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rank-page .page-title h1 {
  font-size: 32px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 14px;
}

.rank-page .page-title h1::before {
  content: "";
  width: 6px;
  height: 32px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--rank-accent), var(--rank-accent-2));
  box-shadow: 0 0 20px rgba(255, 216, 74, 0.7);
}

.rank-page .page-title span {
  font-size: 14px;
  color: var(--rank-text-muted);
  letter-spacing: 0.04em;
}

.rank-page .page-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.rank-page .btn {
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--rank-border-soft);
  background: var(--rank-glass-dark);
  color: var(--rank-text-main);
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.18s ease;
  backdrop-filter: blur(10px);
}

.rank-page .btn:hover {
  border-color: var(--rank-accent);
  box-shadow: 0 0 18px rgba(255, 179, 71, 0.35);
  transform: translateY(-1px);
}

.rank-page .btn-primary {
  background: linear-gradient(135deg, rgba(44, 62, 120, 0.9), rgba(21, 30, 68, 0.98));
  border-color: transparent;
  color: #1b1020;
  font-weight: 600;
  box-shadow: 0 12px 30px rgba(5, 8, 20, 0.9);
}

/* Nút về trang chủ – nổi bật vàng hiệp sĩ */
.rank-page .btn-home-rank {
  background: linear-gradient(135deg, var(--secondary-color) 0%, #fff7cc 40%, var(--primary-color) 100%);
  color: #1b1020;
  font-weight: 600;
  border-color: rgba(255, 216, 74, 0.9);
  box-shadow: 0 10px 28px rgba(255, 216, 74, 0.6);
}

.rank-page .btn-home-rank:hover {
  box-shadow: 0 14px 34px rgba(255, 216, 74, 0.8);
}

.rank-page .rank-section {
  margin-top: 12px;
  padding: 22px 22px 18px;
  border-radius: 22px;
  background:
    radial-gradient(circle at top, rgba(74, 168, 255, 0.18), transparent 60%),
    linear-gradient(145deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.8),
    0 0 0 1px rgba(148, 163, 184, 0.22);
  border: 1px solid rgba(74, 168, 255, 0.6);
  position: relative;
  overflow: hidden;
}

.rank-page .rank-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 0%, rgba(74, 168, 255, 0.28), transparent 55%),
    radial-gradient(circle at 90% 20%, rgba(255, 216, 74, 0.22), transparent 55%);
  mix-blend-mode: screen;
  opacity: 0.9;
  pointer-events: none;
}

.rank-page .rank-section > * {
  position: relative;
  z-index: 1;
}

.rank-page .rank-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.rank-page .rank-tab {
  flex: 1;
  min-width: 110px;
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background:
    radial-gradient(circle at top left, rgba(74, 168, 255, 0.6), rgba(15, 23, 42, 0.98));
  color: var(--rank-text-main);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: center;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.9);
}

.rank-page .rank-tab::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(74, 168, 255, 0.25), rgba(255, 216, 74, 0.25));
  mix-blend-mode: soft-light;
  opacity: 0;
  transition: opacity 0.18s ease;
}

.rank-page .rank-tab span.sub {
  display: block;
  font-size: 10px;
  color: var(--rank-text-muted);
  margin-top: 1px;
}

.rank-page .rank-tab:hover {
  border-color: var(--rank-accent);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.9);
  transform: translateY(-2px) scale(1.01);
}

.rank-page .rank-tab:hover::before {
  opacity: 1;
}

.rank-page .rank-tab.active {
  background: linear-gradient(135deg, var(--rank-accent), var(--rank-accent-2));
  color: #10141f;
  font-weight: 700;
  border-color: transparent;
}

.rank-page .rank-tab.active span.sub {
  color: #3f1024;
}

.rank-page .rank-header-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--rank-text-muted);
  gap: 10px;
  flex-wrap: wrap;
}

.rank-page .rank-header-meta .pill {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
}

.rank-page .rank-header-meta strong {
  color: var(--rank-accent-4);
}

.rank-page .rank-panels {
  border-radius: 18px;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.75), rgba(2, 4, 10, 0.98));
  border: 1px solid rgba(74, 168, 255, 0.6);
  padding: 12px;
  overflow-x: auto;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.9);
}

.rank-page .rank-panel {
  display: none;
}

.rank-page .rank-panel.active {
  display: block;
}

.rank-page .rank-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 520px;
}

.rank-page .rank-table thead {
  background: linear-gradient(90deg, rgba(74, 168, 255, 0.35), rgba(255, 216, 74, 0.3));
}

.rank-page .rank-table th,
.rank-page .rank-table td {
  padding: 9px 11px;
  text-align: left;
  border-bottom: 1px solid rgba(15, 23, 42, 0.9);
  white-space: nowrap;
}

.rank-page .rank-table th {
  font-weight: 600;
  color: #fef9c3;
  text-shadow: 0 0 8px rgba(250, 250, 150, 0.4);
}

.rank-page .rank-table tbody tr:nth-child(odd) {
  background: rgba(15, 23, 42, 0.85);
}

.rank-page .rank-table tbody tr:nth-child(even) {
  background: rgba(15, 23, 42, 0.96);
}

.rank-page .rank-table tbody tr:nth-child(1) {
  background: linear-gradient(90deg, var(--rank-row-top1), transparent);
  box-shadow: inset 4px 0 0 var(--rank-accent);
}

.rank-page .rank-table tbody tr:nth-child(2) {
  background: linear-gradient(90deg, var(--rank-row-top2), transparent);
  box-shadow: inset 4px 0 0 var(--rank-accent-3);
}

.rank-page .rank-table tbody tr:nth-child(3) {
  background: linear-gradient(90deg, var(--rank-row-top3), transparent);
  box-shadow: inset 4px 0 0 var(--rank-accent-4);
}

.rank-page .rank-table tbody tr:hover {
  background: radial-gradient(circle at left, rgba(248, 250, 252, 0.08), transparent 70%);
  transform: translateY(-1px);
}

.rank-page .rank-table td.rank-col {
  width: 60px;
  font-weight: 800;
  color: var(--rank-accent);
}

.rank-page .rank-table td.server-col {
  color: #9cc5ff;
}

.rank-page .rank-table td.name-col {
  color: #EEEE00;
  font-weight: 600;
}

.rank-page .rank-table td.value-col {
  color: #f4f4ff;
  font-weight: 600;
}

.rank-page .empty-row td {
  text-align: center;
  padding: 16px 10px;
  color: var(--rank-text-muted);
  font-style: italic;
}

.rank-page .legend {
  margin-top: 10px;
  font-size: 11px;
  color: var(--rank-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.rank-page .legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.rank-page .legend span::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--rank-accent);
}

.rank-page .legend span:nth-child(2)::before {
  background: var(--rank-accent-3);
}

.rank-page .legend span:nth-child(3)::before {
  background: var(--rank-accent-4);
}

@media (max-width: 768px) {
  .rank-page {
    padding: 12px 8px 22px;
  }

  .rank-page .page-header {
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 8px;
  }

  .rank-page .page-title h1 {
    font-size: 18px;
    letter-spacing: 0.08em;
  }

  .rank-page .page-title h1::before {
    display: none;
  }

  /* Ẩn sub-title để tiết kiệm chiều cao trên mobile */
  .rank-page .page-title span {
    display: none;
  }

  .rank-page .rank-section {
    padding: 16px 12px 14px;
  }

  .rank-page .rank-table {
    font-size: 12px;
    min-width: 420px;
  }
}

.wrapper {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--bg-dark);
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
  min-height: 100vh;
}

/* Warning Banner */
.warning-banner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(90deg, #1a1a1a 0%, #2a2a2a 100%);
  border-bottom: 2px solid var(--primary-color);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.warning-banner img {
  flex-shrink: 0;
}

/* Header */
.main-header {
  background: linear-gradient(135deg, #111b33 0%, #050814 40%, #1b2c52 100%);
  border-bottom: 3px solid var(--primary-color);
  box-shadow: var(--shadow-glow);
}

.header-top {
  padding: 1rem 2rem;
  background: linear-gradient(135deg, #1a1a1a 0%, #0f0f0f 100%);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.logo-section {
  flex-shrink: 0;
}

.main-logo {
  max-height: 80px;
  width: auto;
  filter: drop-shadow(0 0 10px rgba(255, 107, 0, 0.5));
  transition: transform 0.3s ease, filter 0.3s ease;
}

.main-logo:hover {
  transform: scale(1.05);
  filter: drop-shadow(0 0 15px rgba(255, 107, 0, 0.8));
}

/* Auth Section */
.auth-section {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.auth-buttons {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.btn-login,
.btn-register {
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 5px;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  overflow: hidden;
}

.btn-login {
  background: linear-gradient(135deg, #182447 0%, #0c1224 100%);
  color: var(--text-primary);
  border: 2px solid rgba(116, 192, 255, 0.5);
}

.btn-login:hover {
  background: linear-gradient(135deg, #24356a 0%, #111b33 100%);
  border-color: var(--primary-color);
  box-shadow: 0 0 15px rgba(116, 192, 255, 0.6);
  transform: translateY(-2px);
}

.btn-register {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 60%, #ffffff 100%);
  color: var(--text-primary);
  border: 2px solid var(--primary-color);
  box-shadow: var(--shadow-glow);
}

.btn-register:hover {
  background: linear-gradient(135deg, #ffffff 0%, var(--secondary-color) 40%, var(--primary-color) 100%);
  box-shadow: var(--shadow-glow-strong);
  transform: translateY(-2px);
}

/* User Info */
.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  position: relative;
}

.user-avatar {
  width: 50px;
  height: 60px;
  border-radius: 5px;
  border: 2px solid var(--primary-color);
  overflow: hidden;
  box-shadow: 0 0 10px rgba(255, 107, 0, 0.5);
}

.user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-details {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.user-name {
  font-weight: 600;
  color: var(--primary-color);
  font-size: 1rem;
}

.user-email {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-naptien {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, var(--secondary-color) 0%, #ffed4e 100%);
  color: #000;
  text-decoration: none;
  border-radius: 5px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.4);
}

.btn-naptien:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(255, 215, 0, 0.6);
}

.btn-naptien img {
  width: 24px;
  height: 24px;
}

.user-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.user-actions::-webkit-scrollbar {
  height: 3px;
}

.user-actions::-webkit-scrollbar-track {
  background: transparent;
}

.user-actions::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.user-link {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 5px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.user-link:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--primary-color);
}

.user-link.logout {
  color: #ff4444;
}

.user-link.logout:hover {
  background: rgba(255, 68, 68, 0.1);
  border-color: #ff4444;
}

/* User Navigation Buttons */
.user-nav-buttons {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
}

.user-nav-buttons .nav-link {
  flex: 0 0 auto;
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: linear-gradient(180deg, #050814 0%, #0b1020 100%);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.user-nav-buttons .nav-link span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-nav-buttons-highlight .nav-link {
  font-weight: 600;
  border-width: 2px;
}

.user-nav-buttons .nav-link-naptien {
  background: linear-gradient(135deg, var(--secondary-color) 0%, #ffed4e 100%);
  color: #000 !important;
  border-color: var(--secondary-color);
  box-shadow: 0 0 8px rgba(255, 215, 0, 0.4);
}

.user-nav-buttons .nav-link-naptien:hover {
  background: linear-gradient(135deg, #ffed4e 0%, var(--secondary-color) 100%);
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.6);
  transform: translateY(-1px);
}

.user-nav-buttons .nav-link-naptien span {
  color: #000 !important;
}

.user-nav-buttons .nav-link-highlight {
  background: linear-gradient(135deg, var(--primary-color) 0%, #74c0ff 100%);
  color: #fff !important;
  border-color: var(--primary-color);
  box-shadow: 0 0 8px rgba(74, 168, 255, 0.4);
}

.user-nav-buttons .nav-link-highlight:hover {
  background: linear-gradient(135deg, #74c0ff 0%, var(--primary-color) 100%);
  box-shadow: 0 0 12px rgba(74, 168, 255, 0.6);
  transform: translateY(-1px);
}

.user-nav-buttons .nav-link-highlight span {
  color: #fff !important;
}

.user-nav-buttons .nav-link-logout {
  background: linear-gradient(135deg, #ff4444 0%, #ff6666 100%);
  color: #fff !important;
  border-color: #ff4444;
  box-shadow: 0 0 8px rgba(255, 68, 68, 0.4);
}

.user-nav-buttons .nav-link-logout:hover {
  background: linear-gradient(135deg, #ff6666 0%, #ff4444 100%);
  box-shadow: 0 0 12px rgba(255, 68, 68, 0.6);
  transform: translateY(-1px);
}

.user-nav-buttons .nav-link-logout span {
  color: #fff !important;
}

/* Navigation */
.main-nav {
  background: linear-gradient(180deg, #050814 0%, #0b1020 100%);
  border-top: 1px solid var(--border-color);
  border-bottom: 2px solid var(--primary-color);
}

.nav-container {
  display: flex;
  justify-content: center;
  gap: 0;
}

.nav-link {
  flex: 1;
  padding: 1rem 2rem;
  text-decoration: none;
  color: var(--text-secondary);
  text-align: center;
  font-weight: 500;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  transition: all 0.3s ease;
  border-right: 1px solid var(--border-color);
}

.nav-link:last-child {
  border-right: none;
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 107, 0, 0.1);
}

.nav-link:hover::before,
.nav-link.active::before {
  width: 100%;
}

.nav-link.active {
  color: var(--primary-color);
  background: rgba(255, 107, 0, 0.05);
  font-weight: 700;
}

/* Main Content */
.main-content {
  min-height: 500px;
  padding: 2rem;
  background: var(--bg-dark);
}

/* Banner Section */
.banner-trangchu {
  background-image: url('../img/fire47.gif'), url('../img/bg_top.jpg');
  background-position: 50% 78%, center;
  background-repeat: no-repeat, no-repeat;
  background-size: auto, cover;
  height: 400px;
  border-radius: 10px;
  margin-bottom: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.banner-trangchu::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at top, rgba(116, 192, 255, 0.35) 0%, transparent 45%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.25) 100%);
  pointer-events: none;
}

/* Download Section */
.download-trangchu {
  background: radial-gradient(circle at top, rgba(116, 192, 255, 0.18), transparent 55%),
    linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
  border: 2px solid rgba(116, 192, 255, 0.4);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.download-area {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 1rem 0;
}

.download-area a {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: 10px;
  background: var(--bg-dark);
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
  min-width: 120px;
}

/* Nút tải game chính cho mobile */
.download-area a.primary-download {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  background: radial-gradient(circle at top, rgba(116, 192, 255, 0.3), transparent 55%),
    linear-gradient(145deg, #0c1224 0%, #1b2c52 50%, #27427d 100%);
}

.download-area a.primary-download span {
  color: var(--secondary-color);
  font-size: 1rem;
}

.download-area a:hover {
  transform: translateY(-5px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card);
}

.download-area img {
  height: 60px;
  width: auto;
  filter: drop-shadow(0 0 6px rgba(116, 192, 255, 0.6));
  transition: transform 0.3s ease;
}

.download-area a:hover img {
  transform: scale(1.1);
}

.download-area span {
  font-size: 0.9rem;
  color: var(--primary-color);
  font-weight: 600;
  text-align: center;
}

/* Thông báo Section */
.thongbaomoi-trangchu {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.thongbaomoi-trangchu > div:first-child {
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--primary-color);
  margin-bottom: 1.5rem;
}

.thongbaomoi-trangchu > div:first-child span {
  color: var(--primary-color);
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.thongbaomoi-trangchu p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

.thongbaomoi-trangchu .display-block {
  display: block;
  margin: 0.5rem 0;
  color: var(--text-primary);
  font-weight: 600;
}

.thongbaomoi-trangchu img {
  width: 100%;
  border-radius: 10px;
  margin: 1rem 0;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
}

/* Footer */
.main-footer {
  background: linear-gradient(180deg, #050814 0%, #0c1224 50%, #1b2c52 100%);
  border-top: 3px solid var(--primary-color);
  padding: 2rem;
  margin-top: 3rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-logo img {
  max-height: 60px;
  filter: drop-shadow(0 0 10px rgba(116, 192, 255, 0.7));
}

.footer-info {
  text-align: center;
}

.footer-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 2px;
}

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

/* Scroll to Top */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  visibility: hidden;
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 1000;
  cursor: pointer;
  filter: drop-shadow(0 0 10px rgba(255, 107, 0, 0.5));
}

.scroll-top:hover {
  transform: translateY(-5px);
  filter: drop-shadow(0 0 15px rgba(255, 107, 0, 0.8));
}

.scroll-top img {
  width: 50px;
  height: auto;
}

/* Mobile bottom nav (luôn thấy nút Trang chủ / Giới thiệu / Diễn đàn / Xếp hạng trên điện thoại) */
.mobile-bottom-nav {
  display: none;
}

@media (max-width: 768px) {
  .mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 54px;
    background: linear-gradient(180deg, rgba(5, 8, 20, 0.95), rgba(2, 4, 10, 0.98));
    border-top: 1px solid rgba(74, 168, 255, 0.5);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1100;
    backdrop-filter: blur(10px);
  }

  .mobile-bottom-nav__item {
    flex: 1;
    text-align: center;
    text-decoration: none;
    padding-top: 4px;
    color: var(--text-secondary);
    font-size: 11px;
  }

  .mobile-bottom-nav__item.active {
    color: var(--primary-color);
    font-weight: 600;
  }

  .mobile-bottom-nav__label {
    display: block;
  }

  /* chừa chỗ phía dưới để nội dung không bị che */
  .main-content {
    padding-bottom: 5rem;
  }
}

/* Ensure main-nav is visible */
.main-nav {
  display: block;
}

/* Responsive Design - Mobile First Approach */

/* Small Mobile (320px - 480px) */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .wrapper {
    max-width: 100%;
  }

  .warning-banner {
    padding: 0.4rem 0.75rem;
    font-size: 0.65rem;
    flex-wrap: wrap;
  }

  .warning-banner img {
    width: 12px;
    height: 12px;
  }

  .header-top {
    padding: 0.75rem 1rem;
  }

  .header-container {
    flex-direction: column;
    gap: 1rem;
    position: relative;
  }

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

  .main-logo {
    max-height: 50px;
  }

  .main-nav {
    display: block;
    position: static;
  }

  .nav-container {
    flex-direction: column;
  }

  .nav-link {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1rem;
    font-size: 1rem;
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .auth-section {
    width: 100%;
  }

  .auth-buttons {
    width: 100%;
    flex-direction: column;
    gap: 0.75rem;
  }

  .btn-login,
  .btn-register {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    text-align: center;
  }

  .user-info {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    gap: 0.75rem;
    text-align: left;
  }

  .user-avatar {
    width: 50px;
    height: 60px;
  }

  .user-details {
    flex: 1;
    min-width: 0;
  }

  .user-name {
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .user-email {
    font-size: 0.75rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .user-menu {
    display: none;
  }

  .user-nav-buttons {
    display: flex;
    flex-wrap: nowrap;
    width: 100%;
    gap: 0.25rem;
    margin-top: 0.5rem;
  }

  .user-nav-buttons .nav-link {
    flex: 1;
    padding: 0.5rem 0.2rem;
    font-size: 0.6rem;
    text-align: center;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    min-width: 0;
  }

  .user-nav-buttons .nav-link span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .user-nav-buttons-highlight .nav-link {
    font-weight: 600;
  }

  .user-nav-buttons .nav-link-naptien {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #ffed4e 100%);
    color: #000 !important;
    border-color: var(--secondary-color);
    box-shadow: 0 0 6px rgba(255, 215, 0, 0.4);
  }

  .user-nav-buttons .nav-link-naptien span {
    color: #000 !important;
  }

  .user-nav-buttons .nav-link-highlight {
    background: linear-gradient(135deg, var(--primary-color) 0%, #74c0ff 100%);
    color: #fff !important;
    border-color: var(--primary-color);
    box-shadow: 0 0 6px rgba(74, 168, 255, 0.4);
  }

  .user-nav-buttons .nav-link-highlight span {
    color: #fff !important;
  }

  .user-nav-buttons .nav-link-logout {
    background: linear-gradient(135deg, #ff4444 0%, #ff6666 100%);
    color: #fff !important;
    border-color: #ff4444;
    box-shadow: 0 0 6px rgba(255, 68, 68, 0.4);
  }

  .user-nav-buttons .nav-link-logout span {
    color: #fff !important;
  }

  /* Ẩn mobile user menu trong nav */
  .mobile-user-menu {
    display: none;
  }

  .main-content {
    padding: 1rem 0.75rem;
  }

  .banner-trangchu {
    height: 250px;
    margin-bottom: 1.5rem;
    border-radius: 5px;
  }

  .download-trangchu,
  .thongbaomoi-trangchu {
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    border-radius: 5px;
  }

  .download-area {
    gap: 1rem;
    padding: 0.5rem 0;
  }

  .download-area a {
    min-width: 100px;
    padding: 0.75rem;
  }

  .download-area img {
    height: 50px;
  }

  .download-area span {
    font-size: 0.8rem;
  }

  .thongbaomoi-trangchu > div:first-child span {
    font-size: 1.2rem;
  }

  .thongbaomoi-trangchu p {
    font-size: 0.85rem;
    line-height: 1.6;
  }

  .thongbaomoi-trangchu img {
    margin: 0.75rem 0;
  }

  .dangnhap,
  .dangky {
    padding: 1.5rem 1rem;
    margin: 1.5rem 0.75rem;
    border-radius: 5px;
  }

  .dangnhap form > div,
  .dangky form > div {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .dangnhap label,
  .dangky label {
    min-width: auto;
    width: 100%;
    font-size: 0.9rem;
  }

  .dangnhap input[type="text"],
  .dangnhap input[type="password"],
  .dangky input[type="text"],
  .dangky input[type="password"] {
    width: 100%;
    padding: 1rem;
    font-size: 16px; /* Prevent zoom on iOS */
  }

  .dangnhap button,
  .dangky button {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    align-self: stretch;
  }

  .main-footer {
    padding: 1.5rem 1rem;
  }

  .footer-logo img {
    max-height: 50px;
  }

  .footer-title {
    font-size: 1rem;
  }

  .footer-copyright {
    font-size: 0.8rem;
  }

  .scroll-top {
    bottom: 20px;
    right: 20px;
  }

  .scroll-top img {
    width: 40px;
  }

  .list-baidang li {
    padding: 0.75rem;
    font-size: 0.85rem;
  }

  .paging li,
  .page-baidang li {
    min-width: 35px;
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
  }

  .dangnhap-diendan {
    padding: 1.25rem;
    margin-bottom: 1.5rem;
  }

  .diendan-nav-item,
  .diendan-nav-item-2 {
    padding: 0.75rem;
    font-size: 0.85rem;
  }
}

/* Medium Mobile & Tablet (481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .wrapper {
    max-width: 100%;
    margin: 0;
  }

  .header-top {
    padding: 1rem 1.5rem;
  }

  .header-container {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .logo-section {
    flex: 1;
    min-width: 200px;
  }

  .main-logo {
    max-height: 65px;
  }

  .auth-section {
    flex: 1;
    min-width: 200px;
  }

  .auth-buttons {
    justify-content: flex-end;
    gap: 0.75rem;
  }

  .btn-login,
  .btn-register {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }

  .main-nav {
    display: block !important;
    position: static;
  }

  .nav-container {
    flex-direction: row;
  }

  .nav-link {
    padding: 1rem 1.5rem;
    font-size: 0.9rem;
    border-right: 1px solid var(--border-color);
    border-bottom: none;
  }

  .nav-link:last-child {
    border-right: none;
  }

  .main-content {
    padding: 1.5rem;
  }

  .banner-trangchu {
    height: 300px;
  }

  .download-area {
    gap: 1.5rem;
  }

  .download-area a {
    min-width: 110px;
  }

  .dangnhap,
  .dangky {
    padding: 2rem 1.5rem;
    margin: 2rem auto;
  }

  .user-info {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .user-menu {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .btn-naptien {
    width: auto;
    flex: 0 0 auto;
  }
  
  .user-actions {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .user-link {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
  }

  .user-nav-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
  }

  .user-nav-buttons .nav-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
  }

  /* Ẩn mobile user menu trên tablet */
  .mobile-user-menu {
    display: none;
  }
}

/* Tablet Landscape (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .main-nav {
    display: block !important;
    position: static;
  }

  .wrapper {
    max-width: 100%;
    margin: 0 1rem;
  }

  .header-top {
    padding: 1rem 1.5rem;
  }

  .main-logo {
    max-height: 70px;
  }

  .btn-login,
  .btn-register {
    padding: 0.75rem 1.75rem;
  }

  .main-content {
    padding: 1.5rem;
  }

  .banner-trangchu {
    height: 350px;
  }
}

/* Desktop */
@media (min-width: 1025px) {
  .main-nav {
    display: block !important;
    position: static;
  }
}

/* Touch-friendly improvements for all mobile devices */
@media (hover: none) and (pointer: coarse) {
  .btn-login,
  .btn-register,
  .btn-naptien,
  .nav-link,
  .user-link,
  .dangnhap button,
  .dangky button {
    min-height: 44px; /* Apple's recommended touch target size */
    min-width: 44px;
  }

  .nav-link {
    padding: 1.25rem 1.5rem;
  }

  .download-area a {
    min-height: 100px;
  }

  .paging li,
  .page-baidang li {
    min-height: 44px;
    min-width: 44px;
  }
}

/* Utility Classes */
.reset-a {
  text-decoration: none;
  color: inherit;
}

.reset-ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

/* Diễn đàn Styles */
.dangnhap-diendan {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.dangnhap-area {
  background: transparent;
  height: auto;
}

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

.forum-user-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.forum-user-avatar {
  width: 40px;
  height: 50px;
  border-radius: 5px;
  overflow: hidden;
  border: 2px solid var(--primary-color);
  box-shadow: 0 0 8px rgba(255, 107, 0, 0.5);
  flex-shrink: 0;
}

.forum-user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.forum-user-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  font-size: 0.8rem;
}

.forum-user-name {
  font-weight: 600;
  color: var(--primary-color);
}

.forum-user-email {
  font-size: 0.8em;
  color: var(--text-secondary);
}

.forum-user-verify a {
  font-size: 0.75rem;
  color: #ffd38a;
}

.forum-user-verify a:hover {
  color: var(--secondary-color);
}

.forum-guest-actions {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.forum-guest-buttons {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
}

.forum-guest-buttons .btn-login,
.forum-guest-buttons .btn-register {
  padding: 0.3rem 0.75rem;
  font-size: 0.75rem;
  border-radius: 999px;
  text-transform: none;
  letter-spacing: 0;
  width: auto;
  min-width: auto;
  flex: 0 0 auto;
  white-space: nowrap;
}

.forum-naptien-box {
  display: flex;
  align-items: center;
  justify-content: center;
}

.forum-naptien-box img {
  max-height: 38px;
  width: auto;
}

.forum-nav-row {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.forum-nav-row-secondary {
  margin-top: 0.4rem;
}

.diendan-nav-item,
.diendan-nav-item-2 {
  padding: 0.75rem 1rem;
  background: var(--bg-dark);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  text-align: center;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  cursor: pointer;
}

.diendan-nav-item:hover,
.diendan-nav-item.select {
  background: var(--primary-color);
  color: var(--text-primary);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-glow);
}

.diendan-nav-item-2 {
  background: rgba(185, 56, 56, 0.2);
  border-color: #b93838;
}

.diendan-nav-item-2:hover {
  background: #b93838;
  color: var(--text-primary);
}

/* List Styles */
.list-baidang {
  font-size: 0.95rem;
  background: var(--bg-card);
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid var(--border-color);
}

.list-baidang li {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s ease;
}

.list-baidang li:hover {
  background: var(--bg-card-hover);
}

.list-baidang li:last-child {
  border-bottom: none;
}

.list-baidang.thongbao {
  background: linear-gradient(135deg, rgba(255, 107, 0, 0.1) 0%, rgba(255, 107, 0, 0.05) 100%);
  border-color: var(--primary-color);
}

.list-baidang.baidang {
  background: var(--bg-card);
}

/* Paging */
.paging,
.page-baidang {
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
  justify-content: center;
}

.paging li,
.page-baidang li {
  min-width: 40px;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 5px;
  text-align: center;
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  list-style: none;
}

.paging li:hover,
.page-baidang li:hover {
  border-color: var(--primary-color);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.paging .select,
.page-baidang .select {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--text-primary);
  box-shadow: var(--shadow-glow);
}

/* Form Styles */
.dangnhap,
.dangky {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 2rem;
  max-width: 500px;
  margin: 2rem auto;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.dangnhap form,
.dangky form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.dangnhap form > div,
.dangky form > div {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.dangnhap label,
.dangky label {
  min-width: 120px;
  color: var(--text-primary);
  font-weight: 500;
}

.dangnhap input[type="text"],
.dangnhap input[type="password"],
.dangky input[type="text"],
.dangky input[type="password"] {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--bg-dark);
  border: 2px solid var(--border-color);
  border-radius: 5px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.dangnhap input[type="text"]:focus,
.dangnhap input[type="password"]:focus,
.dangky input[type="text"]:focus,
.dangky input[type="password"]:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 10px rgba(255, 107, 0, 0.3);
  background: var(--bg-card);
}

.dangnhap button,
.dangky button {
  padding: 0.75rem 2rem;
  background: linear-gradient(135deg, var(--primary-color) 0%, #ff8533 100%);
  color: var(--text-primary);
  border: 2px solid var(--primary-color);
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-glow);
  align-self: flex-start;
}

.dangnhap button:hover,
.dangky button:hover {
  background: linear-gradient(135deg, #ff8533 0%, var(--primary-color) 100%);
  box-shadow: var(--shadow-glow-strong);
  transform: translateY(-2px);
}

.dangnhap p,
.dangky p {
  margin: 0.5rem 0;
  padding: 0.75rem;
  border-radius: 5px;
  font-weight: 500;
}

.dangnhap p[style*="color: red"],
.dangky p[style*="color: red"] {
  background: rgba(255, 68, 68, 0.1);
  border: 1px solid #ff4444;
  color: #ff6666 !important;
}

.dangnhap p[style*="color: green"],
.dangky p[style*="color: green"] {
  background: rgba(68, 255, 68, 0.1);
  border: 1px solid #44ff44;
  color: #66ff66 !important;
}

.dangnhap a,
.dangky a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.dangnhap a:hover,
.dangky a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Animation */
@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 10px rgba(255, 107, 0, 0.3);
  }
  50% {
    box-shadow: 0 0 20px rgba(255, 107, 0, 0.6);
  }
}

.btn-register {
  animation: glow 2s ease-in-out infinite;
}

/* Bài viết Styles */
/* Tiêu đề bài viết - màu vàng */
.list-baidang .reset-a,
.list-baidang a {
  color: #ffd700 !important;
}

.list-baidang li > div > div > div:first-child {
  color: #ffd700 !important;
}

.list-baidang li > div > div > div:first-child a {
  color: #ffd700 !important;
}

/* Tiêu đề bài viết trong trang chi tiết */
div[style*="color: #1E5B7E"][style*="font-weight: bold"] {
  color: #ffd700 !important;
}

/* Tên người viết - màu #C6E2FF */
.list-baidang span[style*="color: #1E5B7E"],
.list-baidang span[style*="color: #023481"] {
  color: #C6E2FF !important;
}

/* Tên người viết trong trang chi tiết */
div[style*="color: #023481"] span,
span[style*="color: #023481"] {
  color: #C6E2FF !important;
}