/* ============ 共享外观系统（主页 / 小游戏 / AI 对话 共用一套观感） ============ */
:root[data-theme="dark"] {
  --glass: rgba(22, 24, 30, .55);
  --glass-strong: rgba(18, 20, 26, .80);
  --ink: #ecebe7;
  --ink-soft: #cfcdc7;
  --muted: #a3a19a;
  --line: rgba(255, 255, 255, .14);
  --accent: #d4a259;
  --accent-ink: #14100a;
  --accent-soft: rgba(212, 162, 89, .14);
  --code-bg: rgba(255, 255, 255, .07);
  --err: #e07b6a;
  --shadow: 0 8px 32px rgba(0, 0, 0, .35);
  --bg-dim: .8;
}
:root[data-theme="light"] {
  --glass: rgba(255, 255, 255, .58);
  --glass-strong: rgba(255, 255, 255, .86);
  --ink: #2c2a25;
  --ink-soft: #4a473f;
  --muted: #83806f;
  --line: rgba(0, 0, 0, .13);
  --accent: #a3691c;
  --accent-ink: #fff8ec;
  --accent-soft: rgba(163, 105, 28, .12);
  --code-bg: rgba(0, 0, 0, .06);
  --err: #b04a3a;
  --shadow: 0 8px 32px rgba(60, 50, 30, .18);
  --bg-dim: .96;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "KaiTi", "楷体", "STKaiti", "Noto Serif SC", serif;
  font-size: var(--fs, 17px);
  line-height: 1.9;
  color: var(--ink);
  background: #101116;
  min-height: 100%;
}
::selection { background: var(--accent); color: var(--accent-ink); }

/* 背景层 */
#bg {
  position: fixed; inset: -24px; z-index: -1;
  background-size: cover; background-position: center;
  filter: blur(10px) brightness(var(--bg-dim, .9));
  transform: scale(1.04);
}
:root[data-theme="dark"] #bg {
  background-image: var(--user-bg, none),
    radial-gradient(1200px 700px at 70% -10%, #1c2030 0%, transparent 60%),
    radial-gradient(900px 600px at 10% 110%, #241d14 0%, transparent 55%),
    linear-gradient(160deg, #101116, #0c0d11);
}
:root[data-theme="light"] #bg {
  background-image: var(--user-bg, none),
    radial-gradient(1200px 700px at 70% -10%, #fdf6e8 0%, transparent 60%),
    radial-gradient(900px 600px at 10% 110%, #f3ede0 0%, transparent 55%),
    linear-gradient(160deg, #f7f4ec, #efe9db);
}

.glass {
  background: var(--glass);
  backdrop-filter: blur(18px) saturate(1.25);
  -webkit-backdrop-filter: blur(18px) saturate(1.25);
}

/* 顶栏 */
nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 10px 24px;
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
}
nav .logo { font-family: "SimHei", sans-serif; letter-spacing: 3px; font-size: 16px; white-space: nowrap; }
nav .logo b { color: var(--accent); }
nav .menu { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
nav .menu a {
  color: var(--muted); text-decoration: none; font-size: 14.5px;
  padding: 4px 9px; border-radius: 6px; transition: all .2s;
}
nav .menu a:hover { color: var(--accent); background: var(--accent-soft); }
nav .right { display: flex; gap: 8px; align-items: center; }

.icon-btn {
  color: var(--muted); font-size: 14px; font-family: inherit;
  background: none; border: 1px solid var(--line); border-radius: 6px;
  padding: 4px 12px; cursor: pointer; transition: all .2s; white-space: nowrap;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn.on { color: var(--accent); border-color: var(--accent); }

.btn-solid, .btn-ghost {
  display: inline-block; padding: 10px 26px; border-radius: 10px;
  font-family: "SimHei", sans-serif; font-size: 14.5px; letter-spacing: 1.5px;
  text-decoration: none; transition: all .2s; cursor: pointer;
}
.btn-solid { background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent); }
.btn-solid:hover { filter: brightness(1.08); }
.btn-ghost { background: var(--glass); color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* 版心 */
.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }
section { padding: 64px 0 8px; }

.sec-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 26px; }
.sec-head .num { font-family: "SimHei", sans-serif; color: var(--accent); font-size: 14px; letter-spacing: 2px; }
.sec-head h2 { font-family: "SimHei", sans-serif; font-size: 22px; letter-spacing: 4px; }
.sec-head .rule { flex: 1; height: 1px; background: var(--line); }
.sec-head .more { font-size: 13.5px; color: var(--muted); text-decoration: none; }
.sec-head .more:hover { color: var(--accent); }

/* 面板 */
.panel {
  border: 1px solid var(--line); border-radius: 14px;
  padding: 22px 24px; box-shadow: var(--shadow);
}

/* 小游戏卡片 */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.gcard {
  display: block; padding: 14px 16px; border-radius: 12px;
  border: 1px solid var(--line); text-decoration: none;
  background: var(--glass); transition: all .22s; box-shadow: var(--shadow);
  backdrop-filter: blur(16px) saturate(1.2); -webkit-backdrop-filter: blur(16px) saturate(1.2);
}
.gcard:hover { border-color: var(--accent); transform: translateY(-2px); }
.gcard .gname {
  font-family: "SimHei", sans-serif; font-size: 15px; color: var(--ink);
  letter-spacing: 1px; margin-bottom: 3px;
}
.gcard .gdesc { font-size: 13px; color: var(--muted); line-height: 1.6; word-break: break-all; }
.gcard:hover .gname { color: var(--accent); }

.search {
  width: 100%; padding: 10px 16px; margin-bottom: 22px;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--glass); color: var(--ink);
  font: inherit; font-size: 15px; outline: none;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.search:focus { border-color: var(--accent); }

footer {
  text-align: center; color: var(--muted); font-size: 13.5px;
  padding: 64px 24px 44px; letter-spacing: 1px;
}
footer .heart { color: var(--accent); }

/* ============ 外观设置面板（右下角齿轮） ============ */
#ui-gear {
  position: fixed; right: 20px; bottom: 20px; z-index: 180;
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--glass-strong);
  color: var(--ink); font-size: 19px; cursor: pointer;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--shadow); transition: all .2s;
}
#ui-gear:hover { color: var(--accent); border-color: var(--accent); transform: rotate(30deg); }

#ui-mask {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(0, 0, 0, .45);
  align-items: center; justify-content: center;
}
#ui-mask.show { display: flex; }
#ui-panel {
  width: min(480px, 92vw); max-height: 86vh; overflow-y: auto;
  background: var(--glass-strong);
  backdrop-filter: blur(26px) saturate(1.3);
  -webkit-backdrop-filter: blur(26px) saturate(1.3);
  border: 1px solid var(--line); border-radius: 16px;
  padding: 24px 26px; position: relative; box-shadow: var(--shadow);
  scrollbar-width: none;
}
#ui-panel::-webkit-scrollbar { display: none; }
#ui-panel h3 {
  font-family: "SimHei", sans-serif; font-size: 17px; letter-spacing: 2px;
  margin-bottom: 14px;
}
#ui-panel label { display: block; font-size: 13.5px; color: var(--muted); margin: 14px 0 6px; }
#ui-panel .app-row { display: flex; align-items: center; gap: 12px; }
#ui-panel .app-row label { margin: 0; flex-shrink: 0; }
#ui-panel .app-row .val { color: var(--accent); font-family: "SimHei", sans-serif; min-width: 42px; text-align: right; }
#ui-panel input[type="range"] { flex: 1; accent-color: var(--accent); }
#ui-panel input[type="text"], #ui-panel input[type="url"] {
  width: 100%; padding: 8px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: transparent; color: var(--ink);
  font: inherit; font-size: 14px; outline: none;
}
#ui-panel input:focus { border-color: var(--accent); }
#ui-panel .mini-btn {
  background: none; border: 1px solid var(--line); color: var(--muted);
  border-radius: 8px; padding: 6px 14px; cursor: pointer; font: inherit;
  font-size: 13px; transition: all .2s;
}
#ui-panel .mini-btn:hover { border-color: var(--accent); color: var(--accent); }
#ui-panel .row-btns { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
#ui-panel .tip { color: var(--muted); font-size: 12.5px; margin-top: 12px; line-height: 1.7; }
#ui-close {
  position: absolute; top: 12px; right: 16px; font-size: 21px; line-height: 1;
  background: none; border: none; color: var(--muted); cursor: pointer;
}

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
.reveal.on { opacity: 1; transform: none; }

@media (max-width: 680px) {
  nav { padding: 8px 14px; flex-wrap: wrap; }
  nav .menu { order: 3; width: 100%; justify-content: center; }
  section { padding: 48px 0 6px; }
}