:root {
  --bg: #f5f6fa;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #7a8194;
  --line: #e4e7ef;
  --primary: #3b6ef6;
  --primary-dark: #2f57c8;
  --danger: #e5484d;
  --success: #2f9e5f;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(24, 34, 64, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1 { font-size: 1.6rem; margin: 0 0 .6rem; }
h2 { font-size: 1.15rem; margin: 0 0 .6rem; }

.muted { color: var(--muted); font-size: .9rem; }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 22px; background: #fff; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.brand { font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.topnav { display: flex; align-items: center; gap: 16px; }
.user-tag { color: var(--muted); font-size: .9rem; }
.user-tag em {
  font-style: normal; margin-left: 6px; padding: 1px 8px;
  background: #eef2ff; color: var(--primary); border-radius: 999px; font-size: .78rem;
}

.container { max-width: 1080px; margin: 0 auto; padding: 22px; }
.container.narrow { max-width: 620px; }
.narrow { max-width: 460px; margin: 40px auto; }

.site-footer { text-align: center; color: var(--muted); font-size: .82rem; padding: 24px 0 40px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 8px 16px; border-radius: 8px; border: 1px solid var(--line);
  background: #fff; color: var(--ink); cursor: pointer; font-size: .92rem;
  transition: .15s; text-align: center;
}
.btn:hover { border-color: #c9cee0; text-decoration: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn-danger { background: #fff; border-color: #f2c2c3; color: var(--danger); }
.btn-danger:hover { background: #fdecec; }
.btn-sm { padding: 4px 10px; font-size: .84rem; }
.btn-lg { padding: 14px 44px; font-size: 1.15rem; border-radius: 10px; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

/* ---------- 提示 ---------- */
.alert { padding: 10px 14px; border-radius: 8px; margin: 0 0 14px; font-size: .92rem; }
.alert-success { background: #e9f7ef; color: #1c6b41; border: 1px solid #bfe6d0; }
.alert-danger  { background: #fdeded; color: #a8242a; border: 1px solid #f3c9ca; }

/* ---------- 卡片 / 表单 ---------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); margin-bottom: 18px;
}
.form label, .card.form label { display: block; margin-bottom: 14px; font-size: .9rem; color: var(--muted); }
input[type=text], input[type=password], textarea, select {
  width: 100%; padding: 9px 12px; border: 1px solid var(--line); border-radius: 8px;
  font-size: .95rem; margin-top: 5px; font-family: inherit; background: #fff; color: var(--ink);
}
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--primary); }
textarea { min-height: 90px; resize: vertical; }

/* ---------- 首页 ---------- */
.landing { max-width: 900px; margin: 8vh auto 0; text-align: center; }
.landing h1 { font-size: 2rem; }
.landing-sub { margin-bottom: 32px; }
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; text-align: left; }
@media (max-width: 720px) { .cards { grid-template-columns: 1fr; } }
.code-form { display: flex; gap: 10px; margin-top: 10px; }
.code-input {
  font-size: 1.6rem; letter-spacing: .35em; text-align: center; font-weight: 700;
  padding: 10px 12px; width: 100%;
}

/* ---------- 后台 ---------- */
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.class-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.class-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.class-card h3 { margin: 0 0 4px; font-size: 1.1rem; }
.class-code { font-family: ui-monospace, "Consolas", monospace; font-weight: 700; color: var(--primary); }
.class-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.class-meta { color: var(--muted); font-size: .86rem; margin: 2px 0; }

.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar form { margin: 0; }

table.data { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
table.data th, table.data td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; font-size: .92rem; vertical-align: middle; }
table.data th { background: #fafbff; color: var(--muted); font-weight: 600; }
table.data tr:last-child td { border-bottom: none; }
table.data td.ops { white-space: nowrap; }
table.data td.ops form { display: inline-block; margin-right: 6px; }

.badge { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: .78rem; }
.badge-on  { background: #e9f7ef; color: var(--success); }
.badge-off { background: #fdeded; color: var(--danger); }
.badge-range { background: #eef2ff; color: var(--primary); }
.badge-muted { background: #f0f1f5; color: var(--muted); }

details.inline-edit { margin-top: 6px; }
details.inline-edit summary { cursor: pointer; color: var(--primary); font-size: .85rem; }
details.inline-edit form { margin-top: 10px; }

/* ---------- 大屏 ---------- */
.room { max-width: 1000px; margin: 0 auto; }
.room-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  padding: 9px 22px; border: 1px solid var(--line); background: #fff; border-radius: 999px;
  cursor: pointer; font-size: .95rem; color: var(--muted);
}
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.display {
  background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow);
  min-height: 300px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 40px 24px; text-align: center;
}
.placeholder { color: var(--muted); font-size: 1.1rem; }
.spinning { animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: .4; } 50% { opacity: 1; } }

.result-name { font-size: 5rem; font-weight: 800; letter-spacing: .08em; line-height: 1.1; }
.result-meta { margin-top: 18px; color: var(--muted); font-size: .95rem; }
.passage-title { margin-top: 18px; font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.passage-content { margin-top: 12px; font-size: 1.15rem; color: #444; max-width: 760px; line-height: 1.9; white-space: pre-wrap; }

@media (max-width: 640px) { .result-name { font-size: 3rem; } }

.controls { display: flex; align-items: center; gap: 18px; margin-top: 22px; flex-wrap: wrap; }
.switch { color: var(--muted); font-size: .9rem; display: inline-flex; align-items: center; gap: 6px; }

.history-bar { margin-top: 20px; }
.history { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.chip { padding: 3px 12px; background: #eef2ff; color: var(--primary); border-radius: 999px; font-size: .88rem; }

/* ---------- 安装页 ---------- */
.log { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 14px 14px 34px; }
.log li { font-size: .9rem; }
.box { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; margin: 18px 0; }
code { background: #f0f1f5; padding: 1px 6px; border-radius: 5px; font-size: .9rem; }