:root {
  --navy: #0f3d6e;
  --navy-deep: #082744;
  --blue: #1f6feb;
  --blue-soft: #e8f1ff;
  --teal: #0f9d8a;
  --ink: #102a43;
  --ink-sub: #52606d;
  --ink-soft: #7b8a9a;
  --line: #dce8f5;
  --surface: #ffffff;
  --bg: #f3f8fd;
  --shadow: 0 24px 60px rgba(15, 61, 110, 0.14);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% 8%, rgba(31, 111, 235, 0.16), transparent 32%),
    radial-gradient(circle at 88% 4%, rgba(15, 157, 138, 0.14), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 48%, #eef6fd 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(15, 61, 110, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 61, 110, 0.035) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 72%);
}

.page {
  position: relative;
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0 34px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 4px 26px;
}

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

.brand-mark {
  display: inline-flex;
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 10px 18px rgba(15, 61, 110, 0.18));
}

.brand-mark svg {
  width: 100%;
  height: 100%;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-text strong {
  font-size: 20px;
  letter-spacing: 0.04em;
}

.brand-text small {
  color: var(--ink-soft);
  font-size: 10px;
  letter-spacing: 0.18em;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topnav-link {
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--ink-sub);
  font-size: 14px;
  text-decoration: none;
  transition: 0.2s ease;
}

.topnav-link:hover {
  color: var(--navy);
  background: rgba(255, 255, 255, 0.72);
}

.topnav-link--admin {
  color: #ffffff;
  background: var(--navy);
  box-shadow: 0 10px 24px rgba(15, 61, 110, 0.22);
}

.topnav-link--admin:hover {
  color: #ffffff;
  background: var(--navy-deep);
}

.main {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
  gap: 36px;
  align-items: center;
  padding: 18px 0 34px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(46px, 6.4vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.04em;
  color: var(--navy-deep);
}

.hero h1 span {
  color: var(--blue);
}

.lead {
  max-width: 560px;
  margin: 24px 0 28px;
  color: var(--ink-sub);
  font-size: 17px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: 999px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--blue), #155bd6);
  box-shadow: 0 14px 30px rgba(31, 111, 235, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 18px 36px rgba(31, 111, 235, 0.34);
}

.btn-ghost {
  color: var(--navy);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: inset 0 0 0 1px rgba(15, 61, 110, 0.12);
}

.btn-ghost:hover {
  background: #ffffff;
}

.btn-small {
  min-height: 40px;
  padding: 0 16px;
  font-size: 13px;
}

.feature-list {
  display: grid;
  gap: 12px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-sub);
  font-size: 14px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feature-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 11px;
  font-weight: 800;
}

.qr-card {
  position: relative;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.qr-card::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px dashed rgba(31, 111, 235, 0.16);
  border-radius: calc(var(--radius-lg) - 8px);
  pointer-events: none;
}

.qr-card-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.qr-card-head .eyebrow {
  margin-bottom: 8px;
}

.qr-card h2 {
  margin: 0;
  font-size: 25px;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.status-pill {
  flex: 0 0 auto;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--teal);
  background: rgba(15, 157, 138, 0.12);
  font-size: 12px;
  font-weight: 700;
}

.status-pill--loading {
  color: var(--ink-soft);
  background: #eef2f7;
}

.status-pill--warn {
  color: #b25b00;
  background: #fff2df;
}

.status-pill--off {
  color: #8a3944;
  background: #fde8eb;
}

.theme-tabs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
}

.theme-tab {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-sub);
  background: #ffffff;
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: 0.18s ease;
}

.theme-tab:hover {
  border-color: rgba(31, 111, 235, 0.4);
  color: var(--blue);
}

.theme-tab--active {
  border-color: var(--blue);
  color: #ffffff;
  background: var(--blue);
}

.qr-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 320px;
  margin: 22px 0 18px;
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 42%, rgba(31, 111, 235, 0.08), transparent 56%),
    #f8fbff;
  overflow: hidden;
}

.qr-image {
  width: min(280px, 78%);
  height: auto;
  padding: 14px;
  border-radius: 18px;
  background: #ffffff;
  box-shadow: 0 18px 40px rgba(15, 61, 110, 0.16);
}

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 260px;
  color: var(--ink-soft);
  text-align: center;
}

.qr-placeholder-icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 20px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 32px;
}

.qr-placeholder p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.theme-meta {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.meta-item {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(248, 251, 255, 0.8);
}

.meta-item span {
  display: block;
  color: var(--ink-soft);
  font-size: 11px;
}

.meta-item strong {
  display: block;
  margin-top: 4px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  word-break: break-all;
}

.theme-description {
  grid-column: 1 / -1;
  margin: 0;
  padding: 13px 14px;
  border-radius: var(--radius-sm);
  color: var(--ink-sub);
  background: #f3f8ff;
  font-size: 13px;
  line-height: 1.7;
}

.qr-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
}

.qr-countdown {
  margin-left: auto;
  color: var(--ink-soft);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.qr-hint {
  position: relative;
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.7;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 18px 0 34px;
}

.steps article {
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.68);
}

.step-index {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 13px;
  font-weight: 800;
}

.steps h3 {
  margin: 14px 0 6px;
  font-size: 16px;
}

.steps p {
  margin: 0;
  color: var(--ink-sub);
  font-size: 13px;
  line-height: 1.7;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding: 22px 4px 0;
  border-top: 1px solid rgba(15, 61, 110, 0.1);
  color: var(--ink-soft);
  font-size: 12px;
}

.toast {
  position: fixed;
  top: 22px;
  left: 50%;
  z-index: 50;
  max-width: min(420px, calc(100vw - 32px));
  padding: 13px 18px;
  border-radius: 14px;
  color: #ffffff;
  background: rgba(15, 61, 110, 0.94);
  box-shadow: 0 18px 40px rgba(15, 61, 110, 0.22);
  font-size: 13px;
  line-height: 1.5;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -12px);
  transition: 0.22s ease;
}

.toast.is-open {
  opacity: 1;
  transform: translate(-50%, 0);
}

.toast--error {
  background: rgba(164, 49, 65, 0.96);
}

.toast--success {
  background: rgba(13, 120, 104, 0.96);
}

@media (max-width: 960px) {
  .main {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .hero h1 {
    font-size: clamp(44px, 12vw, 68px);
  }

  .qr-card {
    max-width: 640px;
  }
}

@media (max-width: 680px) {
  .page {
    width: min(100% - 24px, 1200px);
    padding-top: 16px;
  }

  .topbar {
    align-items: flex-start;
    padding-bottom: 18px;
  }

  .brand-text strong {
    font-size: 17px;
  }

  .brand-text small {
    display: none;
  }

  .topnav-link {
    padding: 9px 12px;
    font-size: 13px;
  }

  .topnav-link:not(.topnav-link--admin) {
    display: none;
  }

  .lead {
    margin: 18px 0 22px;
    font-size: 15px;
  }

  .qr-card {
    padding: 20px;
    border-radius: 22px;
  }

  .qr-card h2 {
    font-size: 21px;
  }

  .qr-stage {
    min-height: 270px;
  }

  .theme-meta {
    grid-template-columns: 1fr;
  }

  .qr-countdown {
    width: 100%;
    margin-left: 0;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
  }
}