/* 独立页面（兑换 / 验码 / 售码 / 管理后台 / 指南）共用样式，同步白天亮色极简设计体系 */
:root {
  --canvas: #f8fafc;
  --paper: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-soft: #f1f5f9;
  --green: #0f766e;
  --green-dark: #115e59;
  --green-soft: #f0fdf4;
  --green-border: #99f6e4;
  --coral: #e11d48;
  --coral-soft: #fff1f2;
  --mono: "Cascadia Code", "Fira Code", Consolas, ui-monospace, monospace;
  --shadow: 0 4px 14px 0 rgba(15, 23, 42, 0.05);
  --shadow-hover: 0 10px 25px -3px rgba(15, 23, 42, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

.page-shell {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}

.page-shell.wide {
  max-width: 1120px;
}

.page-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  text-decoration: none;
  color: inherit;
}

.page-brand .mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, #0f766e 0%, #0d9488 100%);
  color: #fff;
  font-family: Georgia, serif;
  font-size: 22px;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
}

.page-brand strong {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-brand span {
  display: block;
  color: var(--muted);
  font-size: 12.5px;
}

.card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card + .card {
  margin-top: 20px;
}

.card h1 {
  font-size: 24px;
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--ink);
}

.card h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.card .sub {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.6;
}

label.field {
  display: grid;
  gap: 6px;
  margin-bottom: 16px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
}

label.field small {
  color: var(--muted);
  font-weight: 400;
}

input[type="text"], input[type="email"], input[type="password"], textarea, select {
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  font-size: 14px;
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, textarea:focus, select:focus {
  border-color: var(--green);
  outline: none;
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

input.code-input {
  font-family: var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

button.primary {
  padding: 12px 22px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(135deg, #0f766e 0%, #0d9488 100%);
  color: #fff;
  font-size: 14.5px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.22);
  transition: all 0.18s ease;
}

button.primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #115e59 0%, #0f766e 100%);
  box-shadow: 0 6px 16px rgba(15, 118, 110, 0.3);
  transform: translateY(-1px);
}

button.primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button.secondary {
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s ease;
}

button.secondary:hover {
  border-color: var(--green);
  color: var(--green);
  background: var(--green-soft);
}

.notice {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 8px;
  font-size: 13.5px;
  line-height: 1.6;
}

.notice.ok {
  background: var(--green-soft);
  color: var(--green-dark);
  border: 1px solid var(--green-border);
}

.notice.bad {
  background: var(--coral-soft);
  color: var(--coral);
  border: 1px solid #fecdd3;
}

.notice.plain {
  background: var(--line-soft);
  color: var(--muted);
}

.inline-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.inline-row .field {
  flex: 1;
  margin-bottom: 0;
}

.steps {
  display: grid;
  gap: 6px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 13.5px;
}

.steps li::before {
  content: "· ";
  color: var(--green);
  font-weight: 700;
}

table.plain {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

table.plain th, table.plain td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

table.plain th {
  color: var(--muted);
  font-weight: 600;
  font-size: 12.5px;
  background: var(--line-soft);
}

table.plain td.mono, .mono {
  font-family: var(--mono);
}

.pill {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: var(--green-soft);
  color: var(--green);
}

.pill.gray {
  background: var(--line-soft);
  color: var(--muted);
}

.pill.red {
  background: var(--coral-soft);
  color: var(--coral);
}

.foot-note {
  margin-top: 28px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.7;
}

.foot-note a {
  color: var(--green);
  font-weight: 600;
}

.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.tabs button {
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tabs button.active {
  border-color: var(--green);
  background: var(--green-soft);
  color: var(--green);
  font-weight: 700;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.stat-grid .stat {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.stat b {
  display: block;
  font-size: 24px;
  color: var(--ink);
}

.stat span {
  color: var(--muted);
  font-size: 12.5px;
}

.tutorial-cases {
  display: grid;
  gap: 24px;
}

.tutorial-case {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.tutorial-case > h3 {
  margin: 6px 20px 18px;
  font-size: 19px;
  color: var(--ink);
}

.tutorial-case-number {
  margin: 18px 20px 0;
  color: var(--green);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.tutorial-case-lane {
  padding: 18px 20px;
  border-top: 1px solid var(--line);
}

.tutorial-case-lane.bad {
  background: var(--coral-soft);
}

.tutorial-case-lane.good {
  background: var(--green-soft);
}

.tutorial-case-lane-title {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 700;
}

.tutorial-case-lane.bad .tutorial-case-lane-title {
  background: #fecdd3;
  color: var(--coral);
}

.tutorial-case-lane.good .tutorial-case-lane-title {
  background: var(--green-border);
  color: var(--green-dark);
}

[hidden] {
  display: none !important;
}