/* 飞轮工具底座 · 统一样式
   目标：不依赖设计天赋。系统字体 + 中性灰阶 + 一个强调色，
   任何薄壳套上就是及格线以上的界面。 */

:root {
  color-scheme: light dark; /* 原生控件（下拉弹层/滚动条/日期控件）随系统深浅色 */
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #1a1a1a;
  --dim: #6b6b70;
  --line: #e3e3e6;
  --accent: #2b6cb0;
  --accent-dark: #1f4e7f;
  --ok: #1f7a4d;
  --err: #b42318;
  --warn-bg: #fff8e6;
  --warn-line: #f0d48a;
  --field-bg: #ffffff;
  --radius: 10px;
  --maxw: 780px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 16px 64px;
}

/* ---------- 页头 ---------- */
.site-head { padding: 32px 0 20px; }
.brand {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 1px 8px;
  margin-bottom: 14px;
}
.site-head h1 { font-size: 27px; margin: 0 0 8px; line-height: 1.3; }
.tagline { margin: 0 0 12px; color: var(--dim); font-size: 15px; }
.privacy-note {
  margin: 0;
  font-size: 13px;
  color: var(--ok);
  background: #f0f9f4;
  border: 1px solid #cce8d8;
  border-radius: 6px;
  padding: 7px 11px;
  display: inline-block;
}

/* ---------- 额度条 ---------- */
.quota-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
  margin-bottom: 18px;
}
.quota-bar.licensed { background: #f0f9f4; border-color: #cce8d8; color: var(--ok); }
.quota-bar.empty { background: #fdf0ef; border-color: #f3c9c4; color: var(--err); }

/* ---------- 工具区 ---------- */
.tool-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 28px;
}

/* ---------- 通用控件 ---------- */
button { font: inherit; cursor: pointer; }
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  border-radius: 7px;
  padding: 9px 18px;
  font-size: 15px;
  transition: background .15s;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 9px 18px;
  font-size: 15px;
}
.btn-ghost:hover { background: #f0f0f2; }
.btn-primary.small, .btn-ghost.small { padding: 5px 12px; font-size: 13px; }
.btn-text {
  background: none;
  border: none;
  color: var(--accent);
  text-decoration: underline;
  padding: 0;
  font-size: 14px;
}

label { display: block; font-size: 14px; margin-bottom: 6px; }
input[type="text"], input[type="number"], input[type="file"], select, textarea {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--field-bg);
  color: var(--text);
  width: 100%;
}
select option { background: var(--field-bg); color: var(--text); }
input[type="range"] { width: 100%; }

.field { margin-bottom: 16px; }
.field-row { display: flex; gap: 14px; flex-wrap: wrap; }
.field-row > .field { flex: 1 1 180px; margin-bottom: 0; }

/* ---------- 付费提示 ---------- */
.upgrade-tip {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 8px;
  padding: 11px 14px;
  font-size: 14px;
  margin: 14px 0;
}

/* ---------- 定价 ---------- */
.pricing h2, .faq h2 { font-size: 19px; margin: 0 0 14px; }
.price-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.price .num { font-size: 32px; font-weight: 600; }
.price .unit { color: var(--dim); font-size: 15px; }
.feature-list { list-style: none; padding: 0; margin: 14px 0; font-size: 15px; }
.feature-list li { padding: 4px 0 4px 22px; position: relative; }
.feature-list li::before { content: "·"; position: absolute; left: 8px; color: var(--dim); }
.feature-list li.hl { font-weight: 600; }
.feature-list li.hl::before { content: "★"; color: var(--accent); font-size: 12px; left: 6px; }

.buy-hint {
  background: #f2f6fb;
  border: 1px dashed var(--accent);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 16px 0;
}
.buy-label { font-size: 13px; color: var(--dim); }
.buy-value { font-size: 19px; font-weight: 600; color: var(--accent); letter-spacing: 1px; margin: 2px 0 4px; }
.buy-sub { font-size: 13px; color: var(--dim); }

/* ---------- FAQ ---------- */
.faq { margin-top: 30px; }
.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 8px;
}
.faq summary { cursor: pointer; font-size: 15px; font-weight: 500; }
.faq .answer { margin-top: 8px; font-size: 14px; color: var(--dim); }

/* ---------- 弹窗 ---------- */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}
.modal {
  background: var(--card);
  border-radius: 12px;
  padding: 22px;
  width: 100%;
  max-width: 400px;
}
.modal h3 { margin: 0 0 6px; font-size: 18px; }
.card-input {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 17px;
  letter-spacing: 1px;
  text-align: center;
  margin: 12px 0 8px;
}
.redeem-msg { min-height: 22px; font-size: 14px; }
.redeem-msg.ok { color: var(--ok); }
.redeem-msg.err { color: var(--err); }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin: 12px 0 8px; }

/* ---------- 页脚 ---------- */
.site-foot {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--dim);
  text-align: center;
}
.site-foot p { margin: 3px 0; }
.dim { color: var(--dim); }
.small { font-size: 13px; }

/* ---------- 移动端 ---------- */
@media (max-width: 600px) {
  #app { padding: 0 12px 48px; }
  .site-head { padding: 22px 0 16px; }
  .site-head h1 { font-size: 22px; }
  .tool-box, .price-card { padding: 15px; }
  .quota-bar { font-size: 13px; }
  .modal-actions { flex-direction: column-reverse; }
  .modal-actions button { width: 100%; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --card: #1f1f23;
    --text: #ececf0;
    --dim: #9a9aa2;
    --line: #33333a;
    --accent: #6ba3e0;
    --accent-dark: #8ab8e8;
    --warn-bg: #2a2416;
    --warn-line: #56492a;
    --field-bg: #26262b;
  }
  .privacy-note { background: #16281e; border-color: #24503a; color: #6fca9b; }
  .quota-bar.licensed { background: #16281e; border-color: #24503a; color: #6fca9b; }
  .quota-bar.empty { background: #2c1a19; border-color: #5a2f2c; color: #e88b83; }
  .buy-hint { background: #1b2531; }
  .btn-primary { color: #10161d; }
  .btn-ghost:hover { background: #2a2a30; }
}