:root {
  --ink: #122f65;
  --ink-soft: #657798;
  --blue: #2368f5;
  --blue-deep: #164ebd;
  --cyan: #27bfe6;
  --violet: #6f55e9;
  --yellow: #ffd56a;
  --line: #d6e4f4;
  --surface: #ffffff;
  --canvas: #f4f8fd;
  --shadow: 0 24px 64px rgba(30, 73, 130, .12);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--canvas);
}

* { box-sizing: border-box; }
html { min-width: 320px; }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 12% 22%, rgba(39,191,230,.13), transparent 26rem),
    radial-gradient(circle at 84% 12%, rgba(111,85,233,.1), transparent 28rem),
    var(--canvas);
}
a { color: inherit; }
button { font: inherit; }

.membership-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 0 max(28px, calc((100vw - 1320px) / 2));
  border-bottom: 1px solid rgba(194,214,238,.85);
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(16px);
}
.membership-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.membership-brand strong { font-size: 18px; letter-spacing: -.025em; }
.membership-brand__mark { position: relative; display: grid; place-content: center; width: 42px; height: 42px; border-radius: 50%; background: linear-gradient(145deg, var(--blue-deep), #3b8dff); box-shadow: 0 7px 18px rgba(31,99,233,.22); }
.membership-brand__mark::before, .membership-brand__mark::after, .membership-brand__mark i { position: absolute; inset: 8px; border: 1px solid rgba(255,255,255,.9); border-radius: 50%; content: ""; }
.membership-brand__mark::after { inset: 14px; }
.membership-brand__mark i { inset: 19px; border-width: 2px; background: white; }
.membership-header nav { display: flex; align-items: center; gap: 22px; }
.membership-header nav a { color: var(--ink-soft); font-size: 13px; font-weight: 700; text-decoration: none; }
.membership-header nav a:hover { color: var(--blue); }
.membership-header__account { padding: 10px 15px; border: 1px solid #bcd5f4; border-radius: 10px; background: white; }

main { width: min(1320px, calc(100% - 40px)); margin: 0 auto; padding: 54px 0 48px; }
.membership-hero { position: relative; max-width: 810px; margin: 0 auto 38px; text-align: center; }
.membership-eyebrow { margin: 0 0 12px; color: var(--blue); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; font-weight: 800; letter-spacing: .16em; }
.membership-hero h1 { margin: 0; color: #102753; font-size: clamp(32px, 5vw, 52px); letter-spacing: -.055em; }
.membership-hero > p:not(.membership-eyebrow) { margin: 15px auto 22px; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }
.activation-shortcut { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border: 1px solid #c9d7ff; border-radius: 999px; color: #4f5bd7; background: #f3f3ff; font-size: 13px; font-weight: 750; text-decoration: none; transition: transform .18s ease, border-color .18s ease; }
.activation-shortcut:hover { border-color: #7f89eb; transform: translateY(-1px); }

.membership-signal { position: absolute; left: -130px; top: -23px; width: 102px; height: 102px; border-radius: 50%; background: linear-gradient(145deg, var(--blue), var(--cyan)); box-shadow: 0 16px 35px rgba(37,106,231,.2); }
.membership-signal i { position: absolute; border: 1px solid rgba(255,255,255,.75); border-radius: 50%; }
.membership-signal i:nth-child(1) { inset: 13px; }
.membership-signal i:nth-child(2) { inset: 26px; }
.membership-signal i:nth-child(3) { inset: 39px; background: white; }
.membership-signal span { position: absolute; left: 50%; bottom: -22px; color: var(--blue-deep); font-family: ui-monospace, monospace; font-size: 8px; font-weight: 900; letter-spacing: .14em; transform: translateX(-50%); }

.plan-section { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; align-items: stretch; }
.plan-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 500px;
  padding: 29px 27px 25px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255,255,255,.96);
  box-shadow: var(--shadow);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.plan-card:hover { border-color: #9ebff0; transform: translateY(-5px); box-shadow: 0 30px 70px rgba(30,73,130,.17); }
.plan-card--featured { border: 2px solid #5967e6; background: linear-gradient(180deg, #fff 0%, #fbfbff 100%); }
.plan-card--lifetime { background: linear-gradient(155deg, #fff 0%, #f1f9ff 100%); }
.plan-card--lifetime::after { position: absolute; right: -46px; top: 115px; width: 120px; height: 120px; border: 22px solid rgba(39,191,230,.09); border-radius: 50%; content: ""; }
.plan-card__ribbon { position: absolute; top: 0; right: 20px; padding: 8px 13px; border-radius: 0 0 10px 10px; color: white; background: linear-gradient(120deg, var(--violet), #5368e8); font-size: 10px; font-weight: 800; }
.plan-card__top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 23px; }
.plan-card__top span { color: var(--blue); font-size: 11px; font-weight: 800; }
.plan-card__top small { color: #91a0bc; font-family: ui-monospace, monospace; font-size: 8px; font-weight: 800; letter-spacing: .12em; }
.plan-card h2 { margin: 0; font-size: 27px; letter-spacing: -.04em; }
.plan-card__duration { margin: 8px 0 0; color: var(--ink-soft); font-size: 12px; }
.plan-card__price { display: flex; align-items: flex-start; gap: 3px; margin: 30px 0 0; color: #4f5ed7; }
.plan-card__price sup { margin-top: 8px; font-size: 15px; font-weight: 900; }
.plan-card__price strong { font-size: 48px; line-height: 1; letter-spacing: -.06em; }
.plan-card__summary { min-height: 43px; margin: 18px 0 0; color: var(--ink-soft); font-size: 12px; line-height: 1.7; }
.plan-card ul { display: grid; gap: 13px; margin: 26px 0 28px; padding: 0; list-style: none; }
.plan-card li { position: relative; padding-left: 22px; color: #536580; font-size: 12px; line-height: 1.55; }
.plan-card li::before { position: absolute; left: 0; top: -1px; color: var(--blue); content: "✓"; font-size: 15px; font-weight: 900; }
.plan-card button { min-height: 47px; margin-top: auto; border: 1px solid #91a9f5; border-radius: 11px; color: #4256d0; background: #f5f6ff; cursor: pointer; font-weight: 800; transition: color .18s ease, background .18s ease, transform .18s ease; }
.plan-card button:hover { color: white; background: linear-gradient(120deg, var(--blue), var(--violet)); transform: translateY(-1px); }
.plan-card--featured button { border-color: transparent; color: white; background: linear-gradient(120deg, var(--blue), var(--violet)); }

.payment-note { display: flex; align-items: center; justify-content: center; gap: 9px; margin: 24px auto 0; color: var(--ink-soft); font-size: 11px; text-align: center; }
.payment-note span { display: grid; place-content: center; width: 18px; height: 18px; border-radius: 50%; color: white; background: var(--blue); font-family: Georgia, serif; font-weight: 700; }

.payment-dialog { width: min(520px, calc(100vw - 28px)); padding: 0; overflow: hidden; border: 1px solid #cdddf0; border-radius: 20px; color: var(--ink); box-shadow: 0 28px 90px rgba(15,47,95,.28); }
.payment-dialog::backdrop { background: rgba(13,33,70,.45); backdrop-filter: blur(5px); }
.payment-dialog__bar { display: flex; align-items: center; justify-content: space-between; padding: 14px 19px; color: white; background: linear-gradient(120deg, var(--blue-deep), var(--blue), var(--violet)); }
.payment-dialog__bar button { border: 0; color: white; background: transparent; cursor: pointer; font-size: 25px; }
.payment-dialog__body { padding: 28px; }
.payment-dialog__eyebrow { margin: 0 0 8px; color: var(--blue); font-family: ui-monospace, monospace; font-size: 9px; font-weight: 900; letter-spacing: .14em; }
.payment-dialog__body h2 { margin: 0; font-size: 25px; }
.payment-dialog__body > p:not(.payment-dialog__eyebrow) { margin: 12px 0 0; color: var(--ink-soft); font-size: 13px; line-height: 1.8; }
.payment-dialog__actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 25px; }
.payment-dialog__actions a, .payment-dialog__actions button { display: inline-grid; place-content: center; min-height: 43px; padding: 0 15px; border-radius: 10px; cursor: pointer; font-size: 12px; font-weight: 800; text-decoration: none; }
.payment-dialog__actions a { border: 1px solid #b9cff1; color: var(--blue-deep); background: white; }
.payment-dialog__actions button { border: 0; color: white; background: var(--blue); }

:focus-visible { outline: 3px solid rgba(35,104,245,.25); outline-offset: 3px; }

@media (max-width: 1040px) {
  .plan-section { grid-template-columns: 1fr 1fr; }
  .membership-signal { left: -85px; transform: scale(.75); }
}

@media (max-width: 650px) {
  .membership-header { min-height: 68px; padding: 0 14px; }
  .membership-brand strong { max-width: 180px; font-size: 14px; line-height: 1.25; }
  .membership-header nav > a:first-child { display: none; }
  .membership-header__account { padding: 9px 11px; }
  main { width: min(100% - 24px, 1320px); padding-top: 40px; }
  .membership-hero { margin-bottom: 28px; }
  .membership-hero h1 { font-size: 34px; }
  .membership-hero > p:not(.membership-eyebrow) { font-size: 13px; }
  .membership-signal { display: none; }
  .plan-section { grid-template-columns: 1fr; }
  .plan-card { min-height: 455px; }
  .payment-dialog__actions { display: grid; grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}