:root {
  --bg: #07111f;
  --line: rgba(120, 167, 214, 0.2);
  --text: #f4f8ff;
  --muted: #b6c7df;
  --cyan: #64d7ff;
  --teal: #4be3c2;
  --amber: #ffd067;
  --blue: #2f6dff;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --page-bg:
    radial-gradient(circle at top left, rgba(47, 109, 255, 0.22), transparent 32%),
    radial-gradient(circle at top right, rgba(75, 227, 194, 0.18), transparent 26%),
    linear-gradient(180deg, #08111f 0%, #071423 48%, #081726 100%);
  --topbar-bg: rgba(6, 16, 32, 0.72);
  --topbar-border: rgba(120, 167, 214, 0.2);
  --nav-hover-bg: rgba(255, 255, 255, 0.08);
  --section-bg: linear-gradient(180deg, rgba(11, 29, 53, 0.94), rgba(7, 18, 36, 0.95));
  --section-glow: radial-gradient(circle, rgba(100, 215, 255, 0.18), transparent 64%);
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(182, 199, 223, 0.14);
  --tag-bg: rgba(255, 255, 255, 0.08);
  --tag-text: var(--muted);
  --button-secondary-bg: rgba(255, 255, 255, 0.04);
  --button-secondary-border: rgba(182, 199, 223, 0.32);
  --hero-note-color: rgba(182, 199, 223, 0.86);
  --footer-text: rgba(182, 199, 223, 0.84);
  --nav-auth-border: rgba(100, 215, 255, 0.35);
  --nav-auth-bg: rgba(100, 215, 255, 0.08);
  --nav-auth-text: var(--text);
  --knowledge-shell-bg: rgba(255, 255, 255, 0.04);
  --knowledge-shell-border: rgba(182, 199, 223, 0.16);
  --article-free-bg: linear-gradient(180deg, rgba(47, 109, 255, 0.14), rgba(255, 255, 255, 0.04));
  --article-paid-bg: linear-gradient(180deg, rgba(255, 208, 103, 0.12), rgba(255, 255, 255, 0.04));
  --price-pill-bg: rgba(255, 208, 103, 0.16);
  --price-pill-text: #ffe39e;
  --service-note-bg: rgba(255, 255, 255, 0.05);
  --audience-bg: rgba(255, 255, 255, 0.05);
  --audience-border: rgba(182, 199, 223, 0.16);
  --download-frame-bg: #ffffff;
  --download-frame-shadow: 0 20px 52px rgba(0, 0, 0, 0.22);
  --input-bg: rgba(255, 255, 255, 0.04);
  --input-border: rgba(182, 199, 223, 0.18);
  --input-focus-border: rgba(100, 215, 255, 0.42);
  --input-focus-ring: rgba(100, 215, 255, 0.12);
  --accent-a-bg: linear-gradient(180deg, rgba(47, 109, 255, 0.24), rgba(255, 255, 255, 0.04));
  --accent-b-bg: linear-gradient(180deg, rgba(75, 227, 194, 0.2), rgba(255, 255, 255, 0.04));
  --accent-c-bg: linear-gradient(180deg, rgba(255, 208, 103, 0.18), rgba(255, 255, 255, 0.04));
  --plan-highlight-bg: linear-gradient(180deg, rgba(100, 215, 255, 0.16), rgba(255, 255, 255, 0.05));
  --plan-highlight-border: rgba(100, 215, 255, 0.28);
  --pricing-highlight-bg: linear-gradient(180deg, rgba(100, 215, 255, 0.15), rgba(255, 255, 255, 0.05));
  --pricing-price-color: #ffe39e;
  --theme-toggle-border: rgba(255, 255, 255, 0.16);
  --theme-toggle-bg: rgba(255, 255, 255, 0.04);
  --theme-toggle-text: var(--text);
}

html[data-theme="light"] {
  --bg: #edf4ff;
  --line: rgba(40, 88, 147, 0.16);
  --text: #10233f;
  --muted: #55708f;
  --shadow: 0 24px 72px rgba(55, 90, 135, 0.12);
  --page-bg:
    radial-gradient(circle at top left, rgba(100, 215, 255, 0.24), transparent 30%),
    radial-gradient(circle at top right, rgba(47, 109, 255, 0.12), transparent 28%),
    linear-gradient(180deg, #f4f9ff 0%, #edf5ff 52%, #eaf2ff 100%);
  --topbar-bg: rgba(255, 255, 255, 0.8);
  --topbar-border: rgba(93, 130, 176, 0.18);
  --nav-hover-bg: rgba(16, 35, 63, 0.06);
  --section-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(241, 248, 255, 0.98));
  --section-glow: radial-gradient(circle, rgba(100, 215, 255, 0.12), transparent 64%);
  --card-bg: rgba(255, 255, 255, 0.76);
  --card-border: rgba(93, 130, 176, 0.16);
  --tag-bg: rgba(16, 35, 63, 0.06);
  --tag-text: #476788;
  --button-secondary-bg: rgba(16, 35, 63, 0.04);
  --button-secondary-border: rgba(93, 130, 176, 0.22);
  --hero-note-color: rgba(71, 103, 136, 0.92);
  --footer-text: rgba(71, 103, 136, 0.9);
  --nav-auth-border: rgba(47, 109, 255, 0.24);
  --nav-auth-bg: rgba(47, 109, 255, 0.08);
  --nav-auth-text: #16355c;
  --knowledge-shell-bg: rgba(16, 35, 63, 0.03);
  --knowledge-shell-border: rgba(93, 130, 176, 0.16);
  --article-free-bg: linear-gradient(180deg, rgba(47, 109, 255, 0.1), rgba(255, 255, 255, 0.8));
  --article-paid-bg: linear-gradient(180deg, rgba(255, 208, 103, 0.16), rgba(255, 255, 255, 0.82));
  --price-pill-bg: rgba(255, 208, 103, 0.22);
  --price-pill-text: #805200;
  --service-note-bg: rgba(16, 35, 63, 0.03);
  --audience-bg: rgba(255, 255, 255, 0.7);
  --audience-border: rgba(93, 130, 176, 0.16);
  --download-frame-bg: #ffffff;
  --download-frame-shadow: 0 20px 44px rgba(66, 106, 156, 0.14);
  --input-bg: rgba(255, 255, 255, 0.82);
  --input-border: rgba(93, 130, 176, 0.2);
  --input-focus-border: rgba(47, 109, 255, 0.35);
  --input-focus-ring: rgba(47, 109, 255, 0.1);
  --accent-a-bg: linear-gradient(180deg, rgba(47, 109, 255, 0.12), rgba(255, 255, 255, 0.78));
  --accent-b-bg: linear-gradient(180deg, rgba(75, 227, 194, 0.14), rgba(255, 255, 255, 0.78));
  --accent-c-bg: linear-gradient(180deg, rgba(255, 208, 103, 0.16), rgba(255, 255, 255, 0.78));
  --plan-highlight-bg: linear-gradient(180deg, rgba(100, 215, 255, 0.16), rgba(255, 255, 255, 0.82));
  --plan-highlight-border: rgba(47, 109, 255, 0.2);
  --pricing-highlight-bg: linear-gradient(180deg, rgba(100, 215, 255, 0.16), rgba(255, 255, 255, 0.84));
  --pricing-price-color: #8b5b02;
  --theme-toggle-border: rgba(93, 130, 176, 0.18);
  --theme-toggle-bg: rgba(255, 255, 255, 0.68);
  --theme-toggle-text: #16355c;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-sans);
  background: var(--page-bg);
}

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

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

.site-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.topbar {
  position: sticky;
  top: 14px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 18px;
  margin-bottom: 20px;
  border: 1px solid var(--topbar-border);
  border-radius: 22px;
  background: var(--topbar-bg);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-logo {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 0 0 8px rgba(100, 215, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
}

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

.brand-copy strong {
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.brand-copy span:last-child {
  color: var(--muted);
  font-size: 0.86rem;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  color: var(--muted);
}

.topnav a,
.topnav button {
  padding: 10px 14px;
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.topnav a:hover,
.topnav a:focus-visible,
.topnav button:hover,
.topnav button:focus-visible {
  background: var(--nav-hover-bg);
  color: var(--text);
}

.topnav .nav-pay {
  color: #07111f;
  background: linear-gradient(135deg, var(--amber), #ffecaa);
  font-weight: 700;
}

.topnav .nav-auth {
  border: 1px solid var(--nav-auth-border);
  color: var(--nav-auth-text);
  background: var(--nav-auth-bg);
  font-weight: 700;
}

.theme-toggle {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--theme-toggle-border);
  border-radius: 999px;
  color: var(--theme-toggle-text);
  font: inherit;
  font-weight: 700;
  background: var(--theme-toggle-bg);
  cursor: pointer;
}

main {
  display: grid;
  gap: 20px;
}

.section-card {
  position: relative;
  overflow: hidden;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--section-bg);
  box-shadow: var(--shadow);
}

.section-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 180px;
  height: 180px;
  background: var(--section-glow);
  pointer-events: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.9fr);
  gap: 24px;
  align-items: stretch;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--cyan);
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1,
.pay-card h1 {
  margin: 0;
  font-size: clamp(2.1rem, 4vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.lead,
.pay-copy {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.85;
}

.hero-actions,
.pay-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.button-primary {
  color: #061120;
  background: linear-gradient(135deg, var(--cyan), #b6f3ff);
  box-shadow: 0 16px 40px rgba(100, 215, 255, 0.22);
}

.button-secondary {
  border: 1px solid var(--button-secondary-border);
  color: var(--text);
  background: var(--button-secondary-bg);
}

.hero-note {
  margin: 18px 0 0;
  color: var(--hero-note-color);
  font-size: 0.92rem;
  line-height: 1.7;
}

.hero-panel {
  display: grid;
  gap: 14px;
}

.hero-logo-card {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 20px;
  border: 1px solid var(--card-border);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(100, 215, 255, 0.14), var(--card-bg));
}

.hero-logo {
  width: 96px;
  height: 96px;
  border-radius: 28px;
  object-fit: cover;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.24);
}

.mini-card,
.feature-card,
.plan-card,
.process-step,
.company-item {
  position: relative;
  padding: 22px;
  border: 1px solid var(--card-border);
  border-radius: 24px;
  background: var(--card-bg);
}

.mini-card {
  min-height: 152px;
}

.mini-label,
.plan-tag {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.8rem;
}

.mini-card strong,
.company-item strong,
.company-item a {
  display: block;
  margin-top: 14px;
  font-size: 1.18rem;
  line-height: 1.4;
}

.mini-card p,
.feature-card p,
.process-step p,
.service-note p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.78;
}

.accent-a {
  background: var(--accent-a-bg);
}

.accent-b {
  background: var(--accent-b-bg);
}

.accent-c {
  background: var(--accent-c-bg);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.6rem, 2.4vw, 2.7rem);
  line-height: 1.15;
}

.feature-grid,
.company-grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.knowledge-intro {
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.82;
}

.knowledge-tabs {
  margin-top: 22px;
}

.knowledge-tabs input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.knowledge-tab-controls {
  display: inline-flex;
  gap: 10px;
  padding: 6px;
  border: 1px solid var(--knowledge-shell-border);
  border-radius: 999px;
  background: var(--knowledge-shell-bg);
}

.knowledge-tab-controls label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

#knowledge-free:checked ~ .knowledge-tab-controls label[for="knowledge-free"],
#knowledge-pro:checked ~ .knowledge-tab-controls label[for="knowledge-pro"] {
  color: #061120;
  background: linear-gradient(135deg, var(--cyan), #b6f3ff);
  box-shadow: 0 12px 30px rgba(100, 215, 255, 0.22);
}

.knowledge-panels {
  margin-top: 22px;
}

.knowledge-panel {
  display: none;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

#knowledge-free:checked ~ .knowledge-panels .knowledge-panel-free,
#knowledge-pro:checked ~ .knowledge-panels .knowledge-panel-pro {
  display: grid;
}

.article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 320px;
  padding: 22px;
  border-radius: 24px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
}

.article-card h3 {
  margin: 0;
  font-size: 1.16rem;
  line-height: 1.4;
}

.article-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.article-card-free {
  background: var(--article-free-bg);
}

.article-card-paid {
  background: var(--article-paid-bg);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 0.84rem;
}

.article-pay-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: auto;
}

.price-pill {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--price-pill-bg);
  color: var(--price-pill-text);
  font-weight: 700;
}

.feature-card h3,
.process-step h3,
.plan-card h3 {
  margin: 14px 0 0;
  font-size: 1.18rem;
}

.download-grid {
  display: grid;
  gap: 22px;
  align-items: center;
  margin-top: 22px;
  grid-template-columns: minmax(0, 1.2fr) minmax(220px, 320px);
}

.download-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.86;
}

.download-note {
  margin-top: 14px !important;
}

.download-frame {
  display: grid;
  place-items: center;
  padding: 24px;
  border-radius: 28px;
  background: var(--download-frame-bg);
  box-shadow: var(--download-frame-shadow);
}

.download-frame img {
  width: min(100%, 240px);
  height: auto;
  image-rendering: pixelated;
}

.process-grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.process-step span {
  color: var(--amber);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  font-weight: 700;
}

.plans {
  display: grid;
  gap: 16px;
  margin-top: 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.plan-card ul {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.9;
}

.plan-tag-link {
  cursor: pointer;
}

.plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 18px;
}

.plan-card-highlight {
  border-color: var(--plan-highlight-border);
  background: var(--plan-highlight-bg);
}

.service-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 22px;
  padding: 20px 22px;
  border-radius: 24px;
  background: var(--service-note-bg);
}

.service-note p {
  flex: 1 1 460px;
  margin-top: 0;
}

.audience-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.audience-list span {
  padding: 11px 16px;
  border: 1px solid var(--audience-border);
  border-radius: 999px;
  background: var(--audience-bg);
  color: var(--muted);
}

.company-item span {
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
}

.company-item a {
  word-break: break-all;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 18px;
  padding: 22px 8px 0;
  color: var(--footer-text);
  font-size: 0.9rem;
}

.footer a {
  color: var(--cyan);
}

.pay-shell {
  min-height: 100vh;
}

.pay-main {
  display: grid;
  place-items: center;
  min-height: calc(100vh - 190px);
}

.pay-card {
  width: min(760px, 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px;
  border-radius: 26px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
}

.pricing-card-highlight {
  background: var(--pricing-highlight-bg);
}

.pricing-card h2 {
  margin: 0;
  font-size: 1.8rem;
}

.pricing-price {
  margin: 0;
  color: var(--pricing-price-color);
  font-size: 2rem;
  font-weight: 800;
}

.pricing-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.88;
}

.auth-main {
  display: grid;
  place-items: center;
  min-height: calc(100vh - 190px);
}

.auth-card {
  width: min(680px, 100%);
}

.auth-form {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.auth-field {
  display: grid;
  gap: 10px;
}

.auth-field span {
  color: var(--muted);
  font-size: 0.95rem;
}

.auth-field input {
  width: 100%;
  min-height: 52px;
  padding: 0 16px;
  border: 1px solid var(--input-border);
  border-radius: 16px;
  color: var(--text);
  background: var(--input-bg);
  outline: none;
}

.auth-field input:focus {
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px var(--input-focus-ring);
}

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

.auth-status {
  min-height: 28px;
  margin: 0;
  color: #ffe39e;
  font-weight: 700;
}

.pay-brand {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid rgba(182, 199, 223, 0.16);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.05);
}

.pay-brand p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.pay-brand-logo {
  width: 72px;
  height: 72px;
  border-radius: 22px;
  object-fit: cover;
  flex: none;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.22);
}

.qr-frame {
  margin-top: 24px;
  padding: 18px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(182, 199, 223, 0.16);
}

.qr-frame img {
  width: min(100%, 460px);
  margin: 0 auto;
  border-radius: 20px;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.28);
}

@media (max-width: 980px) {
  .hero,
  .feature-grid,
  .knowledge-panel,
  .plans,
  .pricing-grid,
  .company-grid,
  .process-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .hero-logo-card {
    grid-template-columns: 1fr;
  }

  .topbar {
    position: static;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 12px;
  }

  .topbar,
  .section-card {
    padding: 20px;
    border-radius: 22px;
  }

  .hero h1,
  .pay-card h1 {
    font-size: 2rem;
  }

  .brand-logo {
    width: 48px;
    height: 48px;
    border-radius: 16px;
  }

  .topnav {
    justify-content: flex-start;
  }

  .knowledge-tab-controls {
    display: flex;
    width: 100%;
  }

  .knowledge-tab-controls label {
    flex: 1 1 0;
  }

  .button,
  .topnav .nav-pay {
    width: 100%;
  }

  .hero-actions,
  .pay-actions {
    flex-direction: column;
  }

  .pay-brand {
    align-items: flex-start;
  }

  .footer {
    flex-direction: column;
  }
}