/**
 * 3666.click - Design Stylesheet
 * All classes use prefix ui81- for namespace isolation
 * Color Palette: #ADD8E6 | #87CEEB | #00B8D4 | #2D2D2D | #000080
 */

/* ===== CSS Variables ===== */
:root {
  --ui81-primary: #00B8D4;
  --ui81-primary-dark: #0097A7;
  --ui81-bg-dark: #2D2D2D;
  --ui81-bg-navy: #000080;
  --ui81-bg-deep: #1a1a3e;
  --ui81-text-light: #ADD8E6;
  --ui81-text-blue: #87CEEB;
  --ui81-text-white: #FFFFFF;
  --ui81-text-muted: #a0aec0;
  --ui81-border: rgba(0, 184, 212, 0.25);
  --ui81-card-bg: rgba(0, 0, 128, 0.35);
  --ui81-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  --ui81-radius: 12px;
  --ui81-radius-sm: 8px;
  --ui81-header-h: 56px;
  --ui81-bottom-h: 62px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--ui81-bg-dark);
  color: var(--ui81-text-light);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: var(--ui81-text-blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--ui81-primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ===== Header ===== */
.ui81-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--ui81-header-h);
  background: linear-gradient(135deg, var(--ui81-bg-navy), var(--ui81-bg-deep));
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 12px;
  z-index: 1000;
  border-bottom: 1px solid var(--ui81-border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}
.ui81-logo-wrap {
  display: flex; align-items: center; gap: 8px;
}
.ui81-logo-wrap img {
  width: 32px; height: 32px; border-radius: 6px;
}
.ui81-logo-text {
  font-size: 22px; font-weight: 800; color: var(--ui81-primary);
  letter-spacing: 1px;
}
.ui81-header-btns {
  display: flex; align-items: center; gap: 8px;
}
.ui81-btn-register, .ui81-btn-login {
  padding: 6px 16px; border-radius: 20px; border: none;
  font-size: 13px; font-weight: 700; cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.ui81-btn-register {
  background: linear-gradient(135deg, var(--ui81-primary), var(--ui81-primary-dark));
  color: var(--ui81-bg-dark);
  box-shadow: 0 2px 10px rgba(0, 184, 212, 0.4);
}
.ui81-btn-register:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(0, 184, 212, 0.6); }
.ui81-btn-login {
  background: transparent; color: var(--ui81-text-blue);
  border: 1.5px solid var(--ui81-text-blue);
}
.ui81-btn-login:hover { background: rgba(135, 206, 235, 0.1); }
.ui81-menu-toggle {
  background: none; border: none; color: var(--ui81-text-light);
  font-size: 24px; cursor: pointer; padding: 4px;
  display: flex; align-items: center; justify-content: center;
}

/* ===== Mobile Menu ===== */
.ui81-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 9998;
  display: none;
}
.ui81-overlay-active { display: block; }
.ui81-mobile-menu {
  position: fixed; top: 0; right: -280px;
  width: 280px; height: 100%;
  background: linear-gradient(180deg, var(--ui81-bg-deep), var(--ui81-bg-navy));
  z-index: 9999;
  transition: right 0.3s ease;
  padding: 60px 20px 20px;
  overflow-y: auto;
}
.ui81-menu-active { right: 0; }
.ui81-mobile-menu a {
  display: block; padding: 12px 0;
  color: var(--ui81-text-light); font-size: 15px;
  border-bottom: 1px solid rgba(0, 184, 212, 0.1);
  transition: color 0.2s, padding-left 0.2s;
}
.ui81-mobile-menu a:hover { color: var(--ui81-primary); padding-left: 8px; }
.ui81-menu-close {
  position: absolute; top: 16px; right: 16px;
  background: none; border: none; color: var(--ui81-text-light);
  font-size: 28px; cursor: pointer;
}

/* ===== Main Content ===== */
.ui81-main {
  margin-top: var(--ui81-header-h);
  min-height: calc(100vh - var(--ui81-header-h));
}

/* ===== Carousel ===== */
.ui81-carousel {
  position: relative; width: 100%;
  overflow: hidden; background: var(--ui81-bg-dark);
  cursor: pointer;
}
.ui81-carousel-slide {
  display: none; width: 100%;
}
.ui81-carousel-slide img {
  width: 100%; height: auto;
  aspect-ratio: 16/7; object-fit: cover;
}
.ui81-carousel-dots {
  position: absolute; bottom: 10px;
  left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px;
}
.ui81-carousel-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(173, 216, 230, 0.4);
  border: none; cursor: pointer; transition: background 0.3s;
}
.ui81-dot-active { background: var(--ui81-primary); }

/* ===== Section ===== */
.ui81-section {
  padding: 24px 16px;
}
.ui81-section-title {
  font-size: 20px; font-weight: 700;
  color: var(--ui81-primary); margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ui81-border);
  display: flex; align-items: center; gap: 8px;
}
.ui81-section-title i { font-size: 22px; }

/* ===== Game Tabs ===== */
.ui81-tabs {
  display: flex; gap: 6px;
  overflow-x: auto; padding-bottom: 8px;
  margin-bottom: 16px;
  scrollbar-width: none;
}
.ui81-tabs::-webkit-scrollbar { display: none; }
.ui81-tab-btn {
  padding: 8px 18px; border-radius: 20px;
  border: 1.5px solid var(--ui81-border);
  background: transparent; color: var(--ui81-text-blue);
  font-size: 13px; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: all 0.2s;
}
.ui81-tab-btn:hover, .ui81-tab-active {
  background: var(--ui81-primary);
  color: var(--ui81-bg-dark);
  border-color: var(--ui81-primary);
}

/* ===== Game Grid ===== */
.ui81-game-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.ui81-game-card {
  background: var(--ui81-card-bg);
  border-radius: var(--ui81-radius-sm);
  overflow: hidden; cursor: pointer;
  border: 1px solid var(--ui81-border);
  transition: transform 0.2s, box-shadow 0.2s;
}
.ui81-game-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 184, 212, 0.3);
}
.ui81-game-card img {
  width: 100%; aspect-ratio: 1/1; object-fit: cover;
}
.ui81-game-name {
  padding: 6px 4px; text-align: center;
  font-size: 11px; color: var(--ui81-text-light);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* ===== Content Cards ===== */
.ui81-card {
  background: var(--ui81-card-bg);
  border-radius: var(--ui81-radius);
  padding: 20px; margin-bottom: 16px;
  border: 1px solid var(--ui81-border);
}
.ui81-card h3 {
  color: var(--ui81-primary); font-size: 17px;
  margin-bottom: 10px;
}
.ui81-card p {
  color: var(--ui81-text-light); font-size: 14px;
  line-height: 1.7; margin-bottom: 8px;
}

/* ===== CTA Button ===== */
.ui81-cta {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 14px 36px;
  background: linear-gradient(135deg, var(--ui81-primary), var(--ui81-primary-dark));
  color: var(--ui81-bg-dark); font-size: 16px; font-weight: 800;
  border: none; border-radius: 30px; cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 4px 16px rgba(0, 184, 212, 0.4);
  text-decoration: none;
}
.ui81-cta:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(0, 184, 212, 0.6);
  color: var(--ui81-bg-dark);
}

/* ===== Footer ===== */
.ui81-footer {
  background: linear-gradient(180deg, var(--ui81-bg-deep), var(--ui81-bg-navy));
  padding: 32px 16px 20px;
  border-top: 1px solid var(--ui81-border);
}
.ui81-footer-brand { margin-bottom: 20px; }
.ui81-footer-brand p {
  color: var(--ui81-text-muted); font-size: 13px; line-height: 1.7;
}
.ui81-footer-links {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-bottom: 16px;
}
.ui81-footer-links a {
  padding: 8px 16px; border-radius: 20px;
  background: rgba(0, 184, 212, 0.12); color: var(--ui81-text-blue);
  font-size: 13px; border: 1px solid var(--ui81-border);
  transition: background 0.2s;
}
.ui81-footer-links a:hover { background: rgba(0, 184, 212, 0.25); }
.ui81-footer-copy {
  text-align: center; color: var(--ui81-text-muted);
  font-size: 12px; margin-top: 16px; padding-top: 16px;
  border-top: 1px solid rgba(0, 184, 212, 0.1);
}
.ui81-footer-site-links {
  display: flex; flex-wrap: wrap; gap: 8px 16px;
  margin-bottom: 16px;
}
.ui81-footer-site-links a {
  color: var(--ui81-text-muted); font-size: 12px;
}
.ui81-footer-site-links a:hover { color: var(--ui81-primary); }

/* ===== Bottom Nav ===== */
.ui81-bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--ui81-bottom-h);
  background: linear-gradient(180deg, var(--ui81-bg-deep), var(--ui81-bg-navy));
  display: flex; justify-content: space-around; align-items: center;
  z-index: 1000;
  border-top: 1px solid var(--ui81-border);
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.5);
}
.ui81-bottom-btn {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-width: 60px; min-height: 52px;
  background: none; border: none; cursor: pointer;
  color: var(--ui81-text-muted);
  transition: color 0.2s, transform 0.15s;
}
.ui81-bottom-btn:hover, .ui81-bottom-btn:focus {
  color: var(--ui81-primary); transform: scale(1.08);
}
.ui81-bottom-btn .ui81-nav-icon { font-size: 24px; margin-bottom: 2px; }
.ui81-bottom-btn .ui81-nav-label { font-size: 10px; font-weight: 600; }

/* ===== Back to Top ===== */
.ui81-back-top {
  position: fixed; bottom: 74px; right: 14px;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--ui81-primary); color: var(--ui81-bg-dark);
  border: none; cursor: pointer; font-size: 20px;
  display: none; align-items: center; justify-content: center;
  z-index: 999; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s;
}
.ui81-back-top:hover { transform: scale(1.1); }

/* ===== FAQ ===== */
.ui81-faq-item {
  margin-bottom: 12px; border-radius: var(--ui81-radius-sm);
  background: var(--ui81-card-bg); border: 1px solid var(--ui81-border);
  overflow: hidden;
}
.ui81-faq-q {
  padding: 14px 16px; font-weight: 600; color: var(--ui81-text-blue);
  cursor: pointer; font-size: 14px;
}
.ui81-faq-a {
  padding: 0 16px 14px; color: var(--ui81-text-muted);
  font-size: 13px; line-height: 1.7;
}

/* ===== Feature List ===== */
.ui81-feature-list {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.ui81-feature-item {
  background: var(--ui81-card-bg); border-radius: var(--ui81-radius-sm);
  padding: 16px; border: 1px solid var(--ui81-border);
  text-align: center;
}
.ui81-feature-item i {
  font-size: 28px; color: var(--ui81-primary); margin-bottom: 8px;
}
.ui81-feature-item h4 {
  font-size: 13px; color: var(--ui81-text-blue); margin-bottom: 4px;
}
.ui81-feature-item p {
  font-size: 11px; color: var(--ui81-text-muted);
}

/* ===== Promo Banner ===== */
.ui81-promo-banner {
  background: linear-gradient(135deg, var(--ui81-bg-navy), var(--ui81-primary-dark));
  border-radius: var(--ui81-radius); padding: 20px;
  text-align: center; margin: 16px 0;
  border: 1px solid var(--ui81-border);
}
.ui81-promo-banner h3 {
  color: var(--ui81-primary); font-size: 18px; margin-bottom: 8px;
}
.ui81-promo-banner p {
  color: var(--ui81-text-light); font-size: 14px; margin-bottom: 14px;
}

/* ===== Responsive ===== */
@media (min-width: 769px) {
  .ui81-bottom-nav { display: none; }
  .ui81-main { margin-top: var(--ui81-header-h); }
}
@media (max-width: 768px) {
  .ui81-main { padding-bottom: calc(var(--ui81-bottom-h) + 18px); }
  .ui81-game-grid { grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .ui81-section { padding: 20px 12px; }
}
@media (max-width: 360px) {
  .ui81-game-grid { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .ui81-feature-list { grid-template-columns: 1fr; }
}