:root {
  color-scheme: light;
  --ink: oklch(24% 0.03 70);
  --muted: oklch(49% 0.025 70);
  --paper: oklch(97.5% 0.018 79);
  --panel: oklch(99% 0.009 80);
  --line: oklch(86% 0.025 75);
  --accent: oklch(53% 0.15 38);
  --accent-dark: oklch(43% 0.14 34);
  --accent-soft: oklch(92% 0.055 54);
  --green: oklch(48% 0.11 151);
  --red: oklch(51% 0.16 28);
  --radius: 8px;
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { background: var(--paper); color: var(--ink); }
body { margin: 0; min-height: 100vh; background-image: linear-gradient(to right, color-mix(in oklch, var(--line) 42%, transparent) 1px, transparent 1px); background-size: 28px 28px; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.topbar {
  height: 74px; padding: 0 clamp(20px, 5vw, 72px); display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line); background: color-mix(in oklch, var(--paper) 94%, transparent); backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; background: var(--ink); color: var(--paper); font-size: 18px; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 17px; letter-spacing: .08em; }
.brand small { margin-top: 3px; color: var(--muted); font-family: "PingFang SC", sans-serif; font-size: 11px; letter-spacing: .08em; }
.top-actions { display: flex; gap: 12px; align-items: center; }
.account-email { color: var(--muted); font-family: "PingFang SC", sans-serif; font-size: 13px; }

main { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.auth-layout { min-height: calc(100vh - 148px); display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); gap: clamp(48px, 10vw, 140px); align-items: center; padding: 64px 0; }
.auth-intro { max-width: 650px; }
.auth-intro h1 { font-size: clamp(42px, 6.2vw, 78px); line-height: 1.05; letter-spacing: -.055em; margin: 10px 0 24px; max-width: 8.5em; }
.auth-intro > p:not(.eyebrow) { max-width: 33em; font-family: "PingFang SC", sans-serif; color: var(--muted); font-size: 16px; line-height: 1.8; }
.eyebrow { margin: 0 0 8px; color: var(--accent-dark); font-family: "Avenir Next", "PingFang SC", sans-serif; font-weight: 700; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; }
.trust-list { display: grid; grid-template-columns: repeat(3, 1fr); margin: 48px 0 0; border-top: 1px solid var(--line); }
.trust-list div { padding: 18px 18px 0 0; }
.trust-list dt { color: var(--muted); font-family: "PingFang SC", sans-serif; font-size: 11px; }
.trust-list dd { margin: 6px 0 0; font-size: 14px; }

.auth-panel { background: var(--panel); border: 1px solid var(--line); padding: 30px; box-shadow: 10px 10px 0 var(--accent-soft); }
.segmented { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--line); margin: -8px 0 26px; }
.segment { border: 0; background: transparent; padding: 12px; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; }
.segment.active { color: var(--ink); border-color: var(--accent); font-weight: 700; }
.form-stack { display: grid; gap: 18px; }
label { display: grid; gap: 8px; font-family: "PingFang SC", sans-serif; color: var(--muted); font-size: 12px; }
input { width: 100%; border: 1px solid var(--line); background: var(--paper); color: var(--ink); padding: 12px 13px; outline: none; border-radius: 3px; transition: border-color .18s, box-shadow .18s; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.button { border: 1px solid transparent; padding: 11px 16px; border-radius: 3px; cursor: pointer; transition: transform .16s ease-out, background .16s, color .16s; text-decoration: none; text-align: center; }
.button:hover { transform: translateY(-1px); }
.button:disabled { opacity: .55; cursor: wait; transform: none; }
.button.primary { background: var(--accent); color: var(--panel); border-color: var(--accent); }
.button.primary:hover { background: var(--accent-dark); }
.button.secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.button.secondary:hover { background: var(--ink); color: var(--paper); }
.button.quiet, .button.text { background: transparent; color: var(--muted); }
.button.text { padding: 8px; text-decoration: underline; text-underline-offset: 4px; }
.text-button { border: 0; background: none; color: var(--muted); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.fine-print { margin: 0; color: var(--muted); font: 11px/1.6 "PingFang SC", sans-serif; }
.message { min-height: 20px; margin: 16px 0 0; color: var(--red); font: 12px/1.6 "PingFang SC", sans-serif; }
.message.success { color: var(--green); }

.dashboard { padding: 52px 0 80px; }
.status-strip { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; padding: 0 0 34px; border-bottom: 2px solid var(--ink); }
.status-strip h1 { margin: 4px 0 8px; font-size: clamp(34px, 5vw, 56px); letter-spacing: -.04em; }
.status-detail { margin: 0; color: var(--muted); font-family: "PingFang SC", sans-serif; }
.status-actions { display: flex; gap: 14px; align-items: center; }
.status-badge { padding: 7px 10px; border: 1px solid var(--line); font: 12px "PingFang SC", sans-serif; }
.status-badge.active { color: var(--green); border-color: var(--green); }
.status-badge.expired, .status-badge.suspended { color: var(--red); border-color: var(--red); }
.section { padding: 38px 0; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 30px; margin-bottom: 24px; }
.section-heading.compact { align-items: center; }
.section-heading h2, .side-section h2 { margin: 2px 0 0; font-size: 24px; }
.section-heading > p { margin: 0; max-width: 470px; color: var(--muted); font: 13px/1.65 "PingFang SC", sans-serif; text-align: right; }
.plans { display: grid; grid-template-columns: 1fr 1.1fr 1fr; border: 1px solid var(--line); background: var(--panel); }
.plan { min-height: 250px; padding: 26px; display: flex; flex-direction: column; justify-content: space-between; border-right: 1px solid var(--line); }
.plan:last-child { border: 0; }
.plan.featured { background: var(--ink); color: var(--paper); transform: translateY(-8px); box-shadow: 0 8px 0 var(--accent); }
.plan.featured .plan-note { color: color-mix(in oklch, var(--paper) 70%, var(--ink)); }
.plan-name { margin: 0; font-size: 15px; letter-spacing: .12em; }
.price { margin: 24px 0 3px; font: 52px/1 "Avenir Next", "PingFang SC", sans-serif; font-weight: 700; letter-spacing: -.05em; }
.price span { font-size: 18px; vertical-align: 20px; margin-right: 3px; }
.plan-note { margin: 0; color: var(--muted); font: 12px "PingFang SC", sans-serif; }
.plan-actions { display: grid; gap: 4px; }
.plan.featured .button.text { color: var(--paper); }
.plan.featured .button.primary { background: var(--paper); color: var(--ink); border-color: var(--paper); }

.two-column { display: grid; grid-template-columns: 1.25fr .75fr; gap: 54px; }
.device-list { display: grid; }
.device-item { display: grid; grid-template-columns: 1fr auto; gap: 18px; padding: 16px 0; border-top: 1px solid var(--line); }
.device-item:first-child { border-top: 0; }
.device-item strong, .device-item small { display: block; }
.device-item small { margin-top: 4px; color: var(--muted); font: 11px "PingFang SC", sans-serif; }
.empty { padding: 22px 0; color: var(--muted); font: 13px/1.7 "PingFang SC", sans-serif; }
.side-section { display: grid; align-content: start; gap: 18px; }
.side-section hr { border: 0; border-top: 1px solid var(--line); width: 100%; margin: 12px 0; }
.redeem-form { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.download-list { display: grid; }
.download { display: flex; justify-content: space-between; color: var(--ink); text-decoration: none; padding: 13px 0; border-bottom: 1px solid var(--line); }
.download small { color: var(--muted); font-family: "PingFang SC", sans-serif; }
.download[aria-disabled="true"] { opacity: .45; pointer-events: none; }
.floating-message { position: fixed; right: 24px; bottom: 22px; background: var(--ink); color: var(--paper); padding: 10px 14px; min-height: 0; max-width: 360px; opacity: 0; transform: translateY(8px); transition: .2s ease-out; }
.floating-message.show { opacity: 1; transform: none; }

footer { min-height: 74px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(20px, 5vw, 72px); border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
footer nav { display: flex; gap: 22px; }
footer a { color: inherit; text-decoration: none; }

@media (max-width: 820px) {
  .auth-layout, .two-column { grid-template-columns: 1fr; }
  .auth-layout { gap: 48px; padding-top: 48px; }
  .trust-list { grid-template-columns: 1fr; }
  .plans { grid-template-columns: 1fr; }
  .plan { border-right: 0; border-bottom: 1px solid var(--line); min-height: 220px; }
  .plan.featured { transform: none; box-shadow: inset 5px 0 0 var(--accent); }
  .status-strip, .section-heading { align-items: flex-start; flex-direction: column; }
  .section-heading > p { text-align: left; }
}

@media (max-width: 520px) {
  main { width: min(100% - 28px, 1180px); }
  .topbar { padding: 0 14px; }
  .account-email { display: none; }
  .auth-panel { padding: 22px; box-shadow: 6px 6px 0 var(--accent-soft); }
  .auth-intro h1 { font-size: 43px; }
  .redeem-form { grid-template-columns: 1fr; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 10px; }
}

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