:root {
  --page: #f5f5f7;
  --surface: #ffffff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.1);
  --green: #2fb344;
  --green-dark: #248a3d;
  --red: #ff3b30;
  --red-dark: #d92d24;
  --blue: #0071e3;
  --orange: #ff9f0a;
  --shadow: 0 22px 60px rgba(29, 29, 31, 0.1);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.58;
  letter-spacing: 0;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
  background: rgba(245, 245, 247, 0.82);
  backdrop-filter: saturate(180%) blur(22px);
}

.nav,
.container,
.footer-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 800;
  white-space: nowrap;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  color: rgba(29, 29, 31, 0.78);
  font-size: 13px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
}

.nav-links a[href*="download"] {
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  color: #ffffff;
  background: var(--red);
  box-shadow: 0 8px 18px rgba(255, 59, 48, 0.22);
  font-weight: 800;
}

.nav-links a[href*="download"]:hover,
.nav-links a[href*="download"][aria-current="page"] {
  color: #ffffff;
  background: var(--red-dark);
}

.hero {
  padding: 78px 0 38px;
  background:
    radial-gradient(circle at 48% 8%, rgba(47, 179, 68, 0.14), transparent 34%),
    linear-gradient(180deg, #fbfbfd 0%, var(--page) 100%);
}

.hero-copy {
  max-width: 850px;
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green-dark);
  font-size: 16px;
  font-weight: 800;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(52px, 8vw, 96px);
  line-height: 1;
  font-weight: 850;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.45;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 19px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 650;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

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

.button.primary {
  color: #ffffff;
  background: var(--red);
  box-shadow: 0 10px 24px rgba(255, 59, 48, 0.24);
  font-weight: 800;
}

.button.primary:hover {
  background: var(--red-dark);
}

.button.secondary {
  color: var(--green-dark);
  border-color: rgba(47, 179, 68, 0.34);
  background: rgba(255, 255, 255, 0.72);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 26px auto 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.metric {
  min-height: 112px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.8);
}

.metric strong {
  display: block;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
}

.metric span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 86px 0;
}

.simple-layout {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 18px;
  align-items: stretch;
}

.info-panel,
.step-list,
.download-panel,
.qr-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.info-panel {
  padding: 34px;
}

.info-panel .eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  color: #ffffff;
  background: var(--red);
  box-shadow: 0 10px 24px rgba(255, 59, 48, 0.22);
  font-size: 22px;
  font-weight: 900;
}

.info-panel h2,
.download-band h2,
.download-panel h2,
.qr-panel h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.08;
}

.info-panel p,
.download-panel p,
.qr-panel p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.step-list {
  display: grid;
  gap: 10px;
  padding: 18px;
}

.step-row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: start;
  min-height: 94px;
  padding: 18px;
  border: 1px solid rgba(0, 0, 0, 0.07);
  border-radius: var(--radius);
  background: #fbfbfd;
}

.step-row span,
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: #ffffff;
  background: var(--green);
  font-weight: 800;
}

.step-row strong {
  display: block;
  font-size: 18px;
}

.step-row p {
  margin: 4px 0 0;
  color: var(--muted);
}

.download-band {
  padding: 80px 0;
  color: #ffffff;
  background: #1d1d1f;
}

.download-band .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}

.download-band p {
  max-width: 620px;
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 18px;
}

.page-hero {
  padding: 80px 0 42px;
  text-align: center;
  background: linear-gradient(180deg, #fbfbfd 0%, var(--page) 100%);
}

.page-hero .eyebrow {
  color: var(--red);
}

.page-hero h1 {
  font-size: clamp(42px, 6.2vw, 72px);
}

.download-page {
  padding: 30px 0 86px;
}

.download-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 18px;
  align-items: stretch;
}

.download-panel {
  padding: 36px;
}

.steps {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 13px;
  align-items: start;
}

.step strong {
  display: block;
  margin-bottom: 4px;
}

.step span:not(.step-number) {
  color: var(--muted);
  font-size: 15px;
}

.qr-panel {
  padding: 26px;
  text-align: center;
}

.qr-shell {
  display: grid;
  place-items: center;
  width: min(100%, 286px);
  aspect-ratio: 1;
  margin: 20px auto;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: var(--radius);
  background: #ffffff;
  overflow: hidden;
}

.qr-shell.has-image {
  padding: 14px;
}

.qr-shell img {
  width: 100%;
  height: 100%;
  border-radius: 4px;
  object-fit: contain;
}

.qr-note {
  display: flex;
  width: 100%;
  justify-content: center;
  color: var(--red);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.qr-note-extra {
  margin-top: 6px;
  font-size: 15px;
}

.site-footer {
  padding: 30px 0;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--muted);
  background: #ffffff;
  font-size: 13px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

.footer-inner a {
  color: var(--green-dark);
}

@media (max-width: 860px) {
  .nav,
  .container,
  .footer-inner {
    width: min(100% - 28px, 1120px);
  }

  .simple-layout,
  .download-band .container,
  .download-layout {
    grid-template-columns: 1fr;
  }

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

  .download-band .button {
    justify-self: start;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .nav-links {
    gap: 12px;
    font-size: 12px;
  }

  .hero,
  .section,
  .page-hero {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(44px, 16vw, 68px);
  }

  .info-panel,
  .download-panel,
  .qr-panel {
    padding: 22px;
  }
}

.page-hero .eyebrow {
  color: var(--red);
}

.page-hero h1 {
  font-size: clamp(40px, 12vw, 72px);
}

.admin-page {
  background: #f5f5f7;
}

.admin-shell {
  width: min(1120px, calc(100% - 28px));
  margin: 0 auto;
  padding: 34px 0;
}

.admin-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: 0 18px 48px rgba(29, 29, 31, 0.08);
}

.admin-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 24px;
}

.admin-heading h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.06;
}

.admin-logout {
  color: var(--red);
  font-size: 14px;
  font-weight: 800;
}

.admin-message {
  margin: 10px 0;
  padding: 12px 14px;
  border-radius: var(--radius);
  color: var(--green-dark);
  background: rgba(47, 179, 68, 0.1);
  font-weight: 800;
}

.admin-form,
.admin-upload {
  display: grid;
  gap: 14px;
  max-width: 520px;
}

.admin-form label,
.admin-upload label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.admin-form input,
.admin-upload input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfbfd;
  color: var(--ink);
  font: inherit;
}

.admin-table-wrap {
  margin-top: 26px;
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 14px;
}

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

.admin-table th {
  color: var(--muted);
  font-size: 13px;
}

.admin-qr-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-qr-cell img {
  width: 64px;
  height: 64px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  object-fit: contain;
}

.admin-qr-cell strong,
.admin-qr-cell span {
  display: block;
}

.admin-qr-cell span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}

.status-pill.is-active {
  color: var(--green-dark);
  background: rgba(47, 179, 68, 0.12);
}

.status-pill.is-disabled {
  color: var(--muted);
  background: #f1f1f3;
}

.check-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}

.check-pill.is-ok {
  color: var(--green-dark);
  background: rgba(47, 179, 68, 0.12);
}

.check-pill.is-warning {
  color: #8a5a00;
  background: rgba(255, 159, 10, 0.16);
}

.check-pill.is-problem {
  color: var(--red);
  background: rgba(255, 59, 48, 0.12);
}

.check-pill.is-unknown {
  color: var(--muted);
  background: #f1f1f3;
}

.admin-check-note {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.admin-actions button {
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.admin-actions button.danger {
  color: var(--red);
}

@media (max-width: 560px) {
  .admin-card {
    padding: 20px;
  }

  .admin-heading {
    display: grid;
  }
}