/* 萌虎出发·自主学习 官网 —— 暗色扁平设计令牌（与客户端一致） */
:root {
  --bg: #17181d;
  --bg2: #1b1d23;
  --card: #1f2128;
  --card2: #23252e;
  --border: #2b2f3a;
  --orange: #e8862a;
  --orange-dim: #b56a1e;
  --green: #4caf7d;
  --red: #e05d5d;
  --blue: #5a8fd6;
  --text: #e8eaed;
  --text2: #8b919e;
  --text3: #61666f;
  --radius: 12px;
  --radius-s: 8px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
}
a { color: var(--orange); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

/* ---- 布局 ---- */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(23, 24, 29, .92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 18px; height: 60px; }
.nav .logo { height: 34px; width: auto; }
.nav-links { display: flex; gap: 6px; margin-left: 8px; }
.nav-links a {
  color: var(--text2); padding: 6px 12px; border-radius: 8px; font-size: 14px;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--card); text-decoration: none; }
.nav-right { margin-left: auto; display: flex; gap: 10px; align-items: center; }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 9px 18px; border-radius: var(--radius-s); font-size: 14px; cursor: pointer;
  transition: background .15s, border-color .15s; white-space: nowrap; user-select: none;
}
.btn:hover { background: var(--card2); text-decoration: none; }
.btn.primary { background: var(--orange); border-color: var(--orange); color: #fff; font-weight: 600; }
.btn.primary:hover { background: #f09640; }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 12px; font-size: 13px; border-radius: 6px; }
.btn.danger { color: var(--red); border-color: #5a3434; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---- 卡片 ---- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.card + .card { margin-top: 16px; }

/* ---- 表单 ---- */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.input, select.input, textarea.input {
  width: 100%; background: var(--bg2); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-s);
  padding: 10px 12px; font-size: 14px; outline: none; font-family: inherit;
}
.input:focus { border-color: var(--orange-dim); }
.input::placeholder { color: var(--text3); }
.msg { border-radius: 8px; padding: 10px 12px; font-size: 13px; margin-bottom: 14px; }
.msg.err { background: #3a2222; color: #f0a2a2; border: 1px solid #5a3434; }
.msg.ok { background: #1f3328; color: #9fd8b6; border: 1px solid #2f5a41; }

/* ---- 标签/徽标 ---- */
.tag { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 20px; border: 1px solid var(--border); color: var(--text2); }
.tag.orange { color: var(--orange); border-color: #5c3d1c; background: rgba(232, 134, 42, .08); }
.tag.green { color: var(--green); border-color: #2f5a41; background: rgba(76, 175, 125, .08); }
.tag.red { color: var(--red); border-color: #5a3434; background: rgba(224, 93, 93, .08); }
.tag.blue { color: var(--blue); border-color: #2f4a6b; background: rgba(90, 143, 214, .08); }

/* ---- 表格 ---- */
.table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.table th { text-align: left; color: var(--text2); font-weight: 500; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table td { padding: 10px; border-bottom: 1px solid #23252c; vertical-align: top; }
.table tr:hover td { background: rgba(255, 255, 255, .015); }
.mono { font-family: Consolas, "SF Mono", monospace; font-size: 12.5px; }

/* ---- 分页 ---- */
.pager { display: flex; gap: 8px; align-items: center; justify-content: flex-end; margin-top: 12px; font-size: 13px; color: var(--text2); }

/* ---- tabs ---- */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 18px; flex-wrap: wrap; }
.tabs button {
  background: none; border: none; color: var(--text2); font-size: 14px;
  padding: 10px 14px; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs button.active { color: var(--orange); border-bottom-color: var(--orange); }
.tabs button:hover { color: var(--text); }

/* ---- 首页 ---- */
.hero { padding: 84px 0 60px; text-align: center; }
.hero h1 { font-size: 40px; font-weight: 700; letter-spacing: 1px; }
.hero .sub { color: var(--text2); font-size: 17px; margin: 14px 0 30px; }
.hero .cta { display: flex; gap: 14px; justify-content: center; }
.section { padding: 46px 0; }
.section h2 { font-size: 26px; margin-bottom: 6px; text-align: center; }
.section .desc { text-align: center; color: var(--text2); margin-bottom: 30px; }
.grid { display: grid; gap: 14px; }
.grid.four { grid-template-columns: repeat(4, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid.four { grid-template-columns: repeat(2, 1fr); } .grid.three, .grid.two { grid-template-columns: 1fr; } }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.feature .ico { font-size: 26px; margin-bottom: 8px; }
.feature h3 { font-size: 15.5px; margin-bottom: 6px; }
.feature p { font-size: 13px; color: var(--text2); }
.step-flow { display: flex; gap: 0; align-items: stretch; justify-content: center; flex-wrap: wrap; }
.step { width: 210px; text-align: center; padding: 18px 14px; position: relative; }
.step .no {
  width: 34px; height: 34px; border-radius: 50%; background: var(--card2);
  border: 1px solid var(--orange-dim); color: var(--orange);
  display: flex; align-items: center; justify-content: center; margin: 0 auto 10px; font-weight: 700;
}
.step h4 { font-size: 15px; margin-bottom: 4px; }
.step p { font-size: 12.5px; color: var(--text2); }
.step-arrow { display: flex; align-items: center; color: var(--text3); font-size: 20px; }
@media (max-width: 900px) { .step-arrow { display: none; } }
.price-box { text-align: center; padding: 26px 20px; }
.price-box .big { font-size: 30px; font-weight: 700; color: var(--orange); }
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-s); padding: 14px 18px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-size: 14.5px; }
.faq details p { color: var(--text2); font-size: 13.5px; margin-top: 10px; }
.footer { border-top: 1px solid var(--border); margin-top: 40px; padding: 26px 0 34px; color: var(--text3); font-size: 12.5px; text-align: center; }
.footer a { color: var(--text2); }

/* ---- 登录/注册 ---- */
.auth-wrap { min-height: calc(100vh - 60px); display: flex; align-items: center; justify-content: center; padding: 40px 16px; }
.auth-card { width: 400px; max-width: 100%; }
.auth-card .logo { height: 44px; display: block; margin: 0 auto 18px; }
.auth-card h1 { font-size: 21px; text-align: center; margin-bottom: 18px; }
.auth-card .foot { text-align: center; font-size: 13px; color: var(--text2); margin-top: 14px; }

/* ---- 个人中心 ---- */
.page { padding: 28px 0 60px; }
.page-head { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.page-head h1 { font-size: 22px; }
.balance-card { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }
.balance-num { font-size: 38px; font-weight: 700; color: var(--orange); line-height: 1.1; }
.balance-num small { font-size: 14px; color: var(--text2); font-weight: 400; margin-left: 6px; }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 8px 12px; font-size: 13.5px; }
.kv dt { color: var(--text2); }
.kv dd { word-break: break-all; }
.key-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.key-row .input { flex: 1; min-width: 240px; font-size: 13px; }
.toast {
  position: fixed; top: 74px; left: 50%; transform: translateX(-50%);
  background: var(--card2); border: 1px solid var(--border); color: var(--text);
  padding: 10px 18px; border-radius: 10px; font-size: 14px; z-index: 100;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .4); max-width: 86vw;
}
.toast.err { border-color: #5a3434; color: #f0a2a2; }
details.tx-detail { margin-top: 8px; }
details.tx-detail summary { cursor: pointer; color: var(--blue); font-size: 12.5px; }
details.tx-detail pre {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px; font-size: 12px; margin-top: 8px; white-space: pre-wrap; word-break: break-all;
}
.empty { color: var(--text3); text-align: center; padding: 30px 0; font-size: 13px; }