:root {
  color-scheme: light;
  --ink: #17211f;
  --muted: #66716e;
  --line: #dbe2df;
  --paper: #ffffff;
  --canvas: #f5f7f6;
  --green: #176b4c;
  --green-dark: #0f5038;
  --green-soft: #e4f2eb;
  --red: #b33a31;
  --red-soft: #fbecea;
  --amber: #996507;
  --amber-soft: #fff5dc;
  --shadow: 0 14px 38px rgba(20, 37, 31, .08);
}
* { box-sizing: border-box; }
html { min-width: 320px; background: var(--canvas); }
body { margin: 0; color: var(--ink); background: var(--canvas); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; font-size: 15px; line-height: 1.55; }
.redeem-body { position: relative; min-height: 100vh; background: url('/redeem-pattern.jpg') center / cover fixed no-repeat; }
.redeem-body::before { position: fixed; z-index: 0; inset: 0; background: rgba(255, 255, 255, .72); content: ''; pointer-events: none; }
.redeem-body > * { position: relative; z-index: 1; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
a { color: var(--green); }
.site-header { min-height: 70px; display: flex; align-items: center; border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .94); }
.site-header__inner { width: min(1120px, calc(100% - 40px)); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.brand { color: var(--ink); font-weight: 700; text-decoration: none; font-size: 18px; }
.brand small { display: block; margin-top: 1px; color: var(--muted); font-size: 11px; font-weight: 400; }
.header-link { color: var(--muted); font-size: 13px; text-decoration: none; }
.header-link:hover { color: var(--green); }
.page { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.redeem-page { max-width: 760px; padding: 66px 0 80px; }
.eyebrow { margin: 0 0 10px; color: var(--green); font-size: 13px; font-weight: 700; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 10px; font-size: 30px; line-height: 1.28; }
h2 { margin-bottom: 16px; font-size: 20px; line-height: 1.35; }
h3 { margin-bottom: 8px; font-size: 15px; }
.intro { margin-bottom: 28px; color: var(--muted); }
.panel { padding: 28px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); box-shadow: var(--shadow); }
.panel + .panel { margin-top: 18px; }
.form-row { display: grid; gap: 8px; margin-bottom: 18px; }
label { font-size: 14px; font-weight: 700; }
input, textarea, select { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #bdc9c4; border-radius: 4px; outline: none; background: #fff; color: var(--ink); }
textarea { min-height: 232px; resize: vertical; font-family: Consolas, "Courier New", monospace; font-size: 13px; line-height: 1.55; }
input:focus, textarea:focus, select:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(23, 107, 76, .13); }
.help { margin: 0; color: var(--muted); font-size: 13px; }
.button-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.button { min-height: 42px; padding: 9px 15px; border: 1px solid transparent; border-radius: 4px; color: #fff; background: var(--green); font-weight: 700; }
.button:hover { background: var(--green-dark); }
.button:disabled { cursor: wait; opacity: .65; }
.button--secondary { color: var(--ink); border-color: #bdc9c4; background: #fff; }
.button--secondary:hover { background: #f1f4f2; }
.button--danger { color: var(--red); border-color: #e4b4af; background: #fff; }
.button--danger:hover { background: var(--red-soft); }
.notice { margin: 18px 0 0; padding: 11px 12px; border-left: 3px solid var(--green); background: var(--green-soft); color: #184a37; font-size: 14px; }
.notice--error { border-color: var(--red); background: var(--red-soft); color: #7e251e; }
.notice--warning { border-color: var(--amber); background: var(--amber-soft); color: #6e4800; }
[hidden] { display: none !important; }
.result-grid { display: grid; gap: 16px; }
.secret-field { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: end; }
.secret-field input { font-family: Consolas, "Courier New", monospace; background: #f8faf9; }
.tutorial-list { margin: 0; padding-left: 19px; }
.tutorial-list li + li { margin-top: 7px; }
.footer { padding: 20px 0 32px; color: var(--muted); text-align: center; font-size: 12px; }

.admin-page { padding: 34px 0 70px; }
.admin-title-row { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.admin-title-row p { margin-bottom: 0; color: var(--muted); }
.login-wrap { width: min(440px, calc(100% - 40px)); margin: 90px auto; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.stat { min-height: 112px; padding: 18px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); }
.stat__label { color: var(--muted); font-size: 13px; }
.stat__number { margin-top: 7px; font-size: 30px; font-weight: 700; line-height: 1; }
.admin-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 18px; align-items: start; }
.csv-example { margin: 12px 0 0; padding: 12px; overflow: auto; border: 1px solid var(--line); background: #f7f9f8; color: #3f4b47; font: 12px/1.55 Consolas, "Courier New", monospace; white-space: pre; }
.toolbar { display: grid; grid-template-columns: 1fr 140px auto; gap: 10px; align-items: center; margin-bottom: 14px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 5px; }
table { width: 100%; border-collapse: collapse; background: #fff; font-size: 13px; }
th, td { padding: 12px 11px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; white-space: nowrap; }
th { background: #f3f6f4; color: #50605a; font-size: 12px; font-weight: 700; }
tr:last-child td { border-bottom: 0; }
.key-mask { color: var(--muted); font-family: Consolas, "Courier New", monospace; }
.badge { display: inline-block; padding: 3px 8px; border-radius: 99px; font-size: 12px; font-weight: 700; }
.badge--active { color: #0d633e; background: var(--green-soft); }
.badge--redeemed { color: #755000; background: var(--amber-soft); }
.badge--disabled { color: #8d2e27; background: var(--red-soft); }
.table-actions { display: flex; gap: 7px; }
.tiny-button { min-height: 30px; padding: 4px 8px; border: 1px solid #cbd5d0; border-radius: 3px; background: #fff; color: var(--ink); font-size: 12px; }
.tiny-button:hover { background: #f0f4f1; }
.empty { padding: 30px; color: var(--muted); text-align: center; }
.modal { position: fixed; inset: 0; display: grid; place-items: center; padding: 20px; background: rgba(15, 27, 22, .48); }
.modal__box { width: min(450px, 100%); padding: 26px; border-radius: 6px; background: #fff; box-shadow: var(--shadow); }
@media (max-width: 800px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .admin-grid { grid-template-columns: 1fr; }
  .toolbar { grid-template-columns: 1fr 1fr; }
  .toolbar .button { grid-column: span 2; }
}
@media (max-width: 540px) {
  .site-header__inner, .page { width: min(100% - 28px, 1120px); }
  .site-header { min-height: 62px; }
  .redeem-page { padding: 42px 0 54px; }
  h1 { font-size: 25px; }
  .panel { padding: 20px; }
  .secret-field { grid-template-columns: 1fr; }
  .secret-field .button { width: 100%; }
  .admin-page { padding-top: 25px; }
  .admin-title-row { align-items: flex-start; flex-direction: column; }
  .toolbar { grid-template-columns: 1fr; }
  .toolbar .button { grid-column: auto; }
  .table-actions { flex-wrap: wrap; }
}