/* ============================================================
   棋乐对战平台 · 深色电竞风基础层
   深空底 + 霓虹强调 + 玻璃拟态面板
   ============================================================ */

:root {
  /* 背景层次：从最深到最浅 */
  --bg-0: #070b16;
  --bg-1: #0b1020;
  --bg-2: #111832;
  --bg-3: #18203d;

  /* 玻璃面板 */
  --panel: rgba(20, 27, 51, 0.72);
  --panel-solid: #141b33;
  --panel-hi: rgba(255, 255, 255, 0.06);
  --line: rgba(122, 148, 200, 0.16);
  --line-strong: rgba(122, 148, 200, 0.3);

  /* 文字 */
  --ink: #eaf0ff;
  --ink-2: #a8b6d4;
  --ink-3: #6c7d9e;

  /* 霓虹强调 */
  --accent: #4d8dff;
  --accent-2: #22d3ee;
  --accent-glow: rgba(77, 141, 255, 0.45);
  --win: #34d99b;
  --lose: #ff5c7a;
  --gold: #ffc94d;

  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  --ease: cubic-bezier(0.2, 0.9, 0.3, 1);
}

/* ---------------- 浅色主题 ---------------- */
[data-theme="light"] {
  --bg-0: #e8eef7;
  --bg-1: #f2f6fb;
  --bg-2: #ffffff;
  --bg-3: #eaf0f8;

  --panel: rgba(255, 255, 255, 0.82);
  --panel-solid: #ffffff;
  --panel-hi: rgba(27, 42, 63, 0.04);
  --line: rgba(27, 42, 63, 0.1);
  --line-strong: rgba(27, 42, 63, 0.2);

  --ink: #1b2a3f;
  --ink-2: #44586e;
  --ink-3: #64789a;

  --accent: #2f6bff;
  --accent-2: #0ea5c9;
  --accent-glow: rgba(47, 107, 255, 0.28);
  --win: #10a56d;
  --lose: #e5484d;
  --gold: #d9930d;

  --shadow: 0 12px 40px rgba(27, 42, 63, 0.12);
}

/* 主题图标：深色显示太阳（点去浅色），浅色显示月亮 */
.ico-sun,
.ico-moon {
  display: none;
}

[data-theme="dark"] .ico-sun {
  display: block;
}

[data-theme="light"] .ico-moon {
  display: block;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--bg-1);
  color: var(--ink);
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.hidden {
  display: none !important;
}

/* ---------------- 动态氛围背景 ---------------- */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background: radial-gradient(ellipse 90% 60% at 50% -10%, #16224a 0%, var(--bg-1) 60%, var(--bg-0) 100%);
  transition: background 0.3s ease;
}

/* 浅色下的氛围背景 */
[data-theme="light"] .ambient {
  background: radial-gradient(ellipse 90% 60% at 50% -10%, #dbe7ff 0%, var(--bg-1) 60%, var(--bg-0) 100%);
}

[data-theme="light"] .amb-orb {
  opacity: 0.3;
}

[data-theme="light"] .amb-grid {
  background-image:
    linear-gradient(rgba(27, 42, 63, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 42, 63, 0.045) 1px, transparent 1px);
}

.amb-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: floatOrb 22s ease-in-out infinite;
}

.amb-1 {
  width: 520px;
  height: 520px;
  left: -140px;
  top: -120px;
  background: radial-gradient(circle, rgba(77, 141, 255, 0.55), transparent 70%);
}

.amb-2 {
  width: 460px;
  height: 460px;
  right: -120px;
  top: 30%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.4), transparent 70%);
  animation-delay: -8s;
}

.amb-3 {
  width: 420px;
  height: 420px;
  left: 30%;
  bottom: -160px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.34), transparent 70%);
  animation-delay: -15s;
}

@keyframes floatOrb {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(50px, 40px) scale(1.12);
  }
  66% {
    transform: translate(-40px, 25px) scale(0.94);
  }
}

/* 细网格，增强科技感 */
.amb-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(122, 148, 200, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122, 148, 200, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, #000 30%, transparent 100%);
}

/* 让内容层在背景之上 */
#gate,
#lobby,
#game {
  position: relative;
  z-index: 1;
}

/* ---------------- 按钮体系 ---------------- */
.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel-hi);
  color: var(--ink-2);
  font-size: 14px;
  font-family: inherit;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.18s var(--ease);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
}

.btn:hover:not(:disabled) {
  border-color: var(--line-strong);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.09);
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #2f6bff);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #5f9bff, #3f78ff);
  color: #fff;
  box-shadow: 0 10px 28px var(--accent-glow);
}

.btn-ghost {
  background: transparent;
}

.btn-xs {
  padding: 7px 14px;
  font-size: 13px;
}

.btn-hero {
  width: 100%;
  padding: 13px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: 12px;
}

/* 图标按钮：方形、有 tooltip 感 */
.icon-btn {
  appearance: none;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: var(--panel-hi);
  color: var(--ink-2);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.18s var(--ease);
  flex: 0 0 auto;
}

.icon-btn:hover {
  color: var(--ink);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

/* ---------------- 输入框 ---------------- */
input[type="text"],
input[type="tel"] {
  width: 100%;
  padding: 11px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  background: rgba(7, 11, 22, 0.55);
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: all 0.18s var(--ease);
}

input::placeholder {
  color: var(--ink-3);
}

input:focus {
  border-color: var(--accent);
  background: rgba(7, 11, 22, 0.75);
  box-shadow: 0 0 0 4px rgba(77, 141, 255, 0.16);
}

/* ---------------- 提示条 ---------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 36px;
  transform: translate(-50%, 20px);
  background: rgba(11, 16, 32, 0.94);
  color: var(--ink);
  font-size: 13.5px;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: all 0.28s var(--ease);
  z-index: 80;
  max-width: 84vw;
  text-align: center;
  backdrop-filter: blur(10px);
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------------- 弹层 ---------------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 15, 0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 90;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal-card {
  width: 100%;
  max-width: 540px;
  background: var(--panel-solid);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: popIn 0.32s var(--ease);
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.modal-head h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.modal-sub {
  margin: 4px 0 0;
  font-size: 12.5px;
  color: var(--ink-3);
}

.modal-body {
  padding: 10px 20px 22px;
  max-height: 66vh;
  overflow-y: auto;
}

/* 滚动条 */
.modal-body::-webkit-scrollbar,
.board-panel::-webkit-scrollbar {
  width: 8px;
}

.modal-body::-webkit-scrollbar-thumb,
.board-panel::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 640px) {
  .brand-title {
    display: none;
  }
}