:root {
  --page: #f6f8fb;
  --bg: #ffffff;
  --bg-soft: #f0f6fb;
  --text: #102033;
  --text-soft: #4f6277;
  --text-muted: #738296;
  --border: #dce6ef;
  --border-strong: #c8d8e6;
  --primary: #0b4f7a;
  --primary-dark: #073957;
  --accent: #0891b2;
  --accent-soft: #e8f7fb;
  --success-soft: #eaf8f2;
  --warning-soft: #fff4e6;
  --card: #ffffff;
  --shadow: 0 18px 48px rgba(15, 43, 68, 0.09);
  --shadow-soft: 0 10px 28px rgba(15, 43, 68, 0.06);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(8, 145, 178, 0.10), transparent 34rem),
    var(--page);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

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

p {
  margin: 0 0 16px;
}

ul,
ol {
  margin: 0;
  padding-left: 20px;
}

li + li {
  margin-top: 8px;
}

section,
[id] {
  scroll-margin-top: 96px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px max(20px, calc((100vw - var(--max-width)) / 2));
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid rgba(220, 230, 239, 0.86);
  backdrop-filter: blur(14px);
  box-shadow: 0 8px 26px rgba(15, 43, 68, 0.04);
}

.brand {
  color: var(--primary-dark);
  font-size: 16px;
  font-weight: 800;
  white-space: nowrap;
}

.top-nav {
  display: flex;
  gap: 8px;
  color: var(--text-soft);
  font-size: 14px;
  white-space: nowrap;
}

.top-nav a {
  border-radius: 999px;
  padding: 7px 11px;
}

.top-nav a:hover,
.top-nav a:focus {
  background: var(--accent-soft);
  color: var(--primary);
}

.section {
  padding: 78px 0;
}

.hero {
  padding: 82px 0 40px;
}

.muted {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(232, 241, 248, 0.72));
}

.container {
  width: min(100% - 40px, var(--max-width));
  margin: 0 auto;
}

.narrow {
  width: min(100% - 40px, 840px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(310px, 0.84fr);
  gap: 28px;
  align-items: stretch;
}

.hero-copy,
.hero-visual,
.flow-card,
.conclusion-card,
.method-card,
.prompt-card,
.list-card,
.check-panel,
.cta-box,
.table-wrap,
.faq-item {
  border: 1px solid rgba(220, 230, 239, 0.92);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.hero-copy {
  padding: clamp(26px, 5vw, 44px);
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  border: 1px solid rgba(8, 145, 178, 0.18);
  border-radius: 999px;
  padding: 5px 11px;
  background: var(--accent-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
}

h1 {
  max-width: 800px;
  font-size: clamp(34px, 5.1vw, 58px);
  letter-spacing: 0;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(26px, 3.1vw, 36px);
}

h3 {
  margin-bottom: 12px;
  font-size: 20px;
}

.hero-subtitle {
  max-width: 760px;
  margin-top: 22px;
  color: var(--text-soft);
  font-size: 18px;
}

.page-meta {
  margin: 16px 0 0;
  color: var(--text-muted);
  font-size: 14px;
}

.answer-box {
  margin-bottom: 26px;
  border: 1px solid rgba(8, 145, 178, 0.18);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: linear-gradient(180deg, #ffffff, var(--accent-soft));
  color: var(--text-soft);
  box-shadow: var(--shadow-soft);
}

.answer-box strong {
  color: var(--primary-dark);
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  padding: 11px 18px;
  border: 1px solid transparent;
  font-weight: 800;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.button:hover,
.button:focus {
  transform: translateY(-2px);
}

.button.primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff;
  box-shadow: 0 12px 26px rgba(11, 79, 122, 0.22);
}

.button.primary:hover,
.button.primary:focus {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.button.secondary {
  background: #ffffff;
  color: var(--primary);
  border-color: var(--border-strong);
}

.hero-visual {
  overflow: hidden;
  display: grid;
  align-content: start;
  gap: 0;
  background: #ffffff;
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 1px solid rgba(220, 230, 239, 0.92);
}

.flow-card {
  position: relative;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  padding: 22px;
  background: #ffffff;
  box-shadow: none;
  color: var(--text);
}

.flow-card::after {
  position: absolute;
  right: -90px;
  bottom: -90px;
  width: 220px;
  height: 220px;
  border-radius: 999px;
  background: rgba(8, 145, 178, 0.08);
  content: "";
}

.flow-label {
  position: relative;
  z-index: 1;
  margin-bottom: 18px;
  color: var(--primary);
  font-weight: 800;
}

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

.flow-steps span {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(8, 145, 178, 0.18);
  border-radius: 999px;
  padding: 9px 11px;
  background: var(--accent-soft);
  color: var(--primary-dark);
  font-weight: 800;
  font-size: 14px;
}

.flow-steps span::before {
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--primary);
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

.flow-note {
  position: relative;
  z-index: 1;
  margin: 20px 0 0;
  color: var(--text-soft);
}

.conclusion-card {
  display: grid;
  grid-template-columns: minmax(180px, 0.28fr) minmax(0, 1fr);
  gap: 22px;
  margin-top: 24px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.conclusion-card h2 {
  margin-bottom: 0;
  color: var(--primary-dark);
  font-size: 22px;
}

.conclusion-card ol,
.check-list {
  padding-left: 0;
  list-style: none;
}

.conclusion-card li {
  position: relative;
  margin-top: 0;
  padding-left: 28px;
}

.conclusion-card li + li {
  margin-top: 10px;
}

.conclusion-card li::before,
.check-list li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: "✓";
  font-weight: 900;
}

.narrow > p {
  color: var(--text-soft);
  font-size: 17px;
}

.method-grid,
.prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 30px;
}

.method-card,
.prompt-card,
.list-card,
.check-panel {
  padding: 22px;
}

.method-card {
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.method-card::after {
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  content: "";
}

.method-card:hover {
  transform: translateY(-3px);
  border-color: rgba(8, 145, 178, 0.36);
  box-shadow: var(--shadow);
}

.method-card.wide {
  grid-column: 1 / -1;
}

.method-number {
  display: inline-flex;
  margin-bottom: 14px;
  border-radius: 999px;
  padding: 4px 10px;
  background: var(--accent-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 900;
}

.method-card p,
.prompt-card p,
.list-card li,
.check-panel li {
  color: var(--text-soft);
}

.method-card strong {
  color: var(--primary-dark);
}

.method-card p:last-child,
.prompt-card p:last-child,
.faq-item p:last-child,
.list-card p:last-child {
  margin-bottom: 0;
}

.prompt-card {
  overflow: hidden;
  padding: 0;
}

.prompt-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 18px 14px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #ffffff, #f8fbfd);
}

.prompt-head h3 {
  margin-bottom: 0;
  font-size: 18px;
}

.copy-button {
  flex: 0 0 auto;
  min-height: 38px;
  border: 1px solid rgba(8, 145, 178, 0.22);
  border-radius: var(--radius-sm);
  padding: 8px 13px;
  background: var(--primary);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 8px 18px rgba(11, 79, 122, 0.18);
}

.copy-button:hover,
.copy-button:focus {
  background: var(--primary-dark);
}

pre {
  overflow-x: auto;
  margin: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 18px;
  background: #0f2233;
  color: #eaf6ff;
  font-size: 14px;
  line-height: 1.68;
  white-space: pre-wrap;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.table-wrap {
  overflow-x: auto;
  margin-top: 30px;
  background: #ffffff;
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

caption {
  padding: 14px 18px;
  background: #ffffff;
  color: var(--primary-dark);
  font-weight: 900;
  text-align: left;
}

th,
td {
  padding: 17px 18px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef5fa;
  color: var(--primary-dark);
  font-weight: 900;
}

td:first-child {
  color: var(--primary-dark);
  font-weight: 900;
}

tr:last-child td {
  border-bottom: 0;
}

tbody tr:nth-child(even) {
  background: #fbfdff;
}

.table-note {
  margin-top: 16px;
  color: var(--text-soft);
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.check-panel {
  background: linear-gradient(180deg, #ffffff, #f7fbfd);
}

.check-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.check-list li {
  position: relative;
  margin-top: 0;
  border: 1px solid rgba(8, 145, 178, 0.18);
  border-radius: 999px;
  padding: 8px 12px 8px 30px;
  background: var(--accent-soft);
  color: var(--primary-dark);
  font-weight: 800;
}

.check-list li::before {
  left: 12px;
  top: 8px;
}

.list-card {
  position: relative;
  overflow: hidden;
}

.list-card::before {
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  content: "";
}

.list-card:first-child {
  background: linear-gradient(180deg, #ffffff, var(--success-soft));
}

.list-card:first-child::before {
  background: #24a77e;
}

.list-card:last-child {
  background: linear-gradient(180deg, #ffffff, var(--warning-soft));
}

.list-card:last-child::before {
  background: #f59e0b;
}

.list-card ul {
  color: var(--text-soft);
}

.cta-section {
  padding: 84px 0;
  background: transparent;
  color: #ffffff;
}

.cta-box {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(330px, 0.58fr);
  gap: 26px;
  align-items: center;
  overflow: hidden;
  padding: 32px;
  border-color: rgba(255, 255, 255, 0.22);
  background:
    radial-gradient(circle at 12% 10%, rgba(255, 255, 255, 0.18), transparent 16rem),
    linear-gradient(135deg, #073957, #0b6f8b 72%, #0b4f7a);
  box-shadow: 0 24px 64px rgba(7, 57, 87, 0.26);
}

.cta-box p,
.cta-box .section-kicker {
  color: rgba(255, 255, 255, 0.86);
}

.cta-box .section-kicker {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.cta-copy h2 {
  font-size: clamp(28px, 4vw, 44px);
}

.beta-form {
  display: grid;
  gap: 14px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius);
  padding: 20px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
  box-shadow: 0 18px 42px rgba(7, 57, 87, 0.22);
}

.form-row {
  display: grid;
  gap: 6px;
}

.form-row label,
.consent {
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 800;
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  line-height: 1.45;
}

.form-row textarea {
  resize: vertical;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(8, 145, 178, 0.16);
}

.honeypot {
  position: absolute;
  left: -9999px;
}

.consent {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  line-height: 1.55;
}

.consent input {
  margin-top: 5px;
}

.form-submit {
  width: 100%;
  border: 0;
  cursor: pointer;
  font: inherit;
}

.form-submit:disabled {
  cursor: not-allowed;
  opacity: 0.72;
  transform: none;
}

.form-status {
  min-height: 24px;
  margin: 0;
  color: var(--primary-dark);
  font-weight: 800;
}

.form-status.error {
  color: #b42318;
}

.form-status.success {
  color: #067647;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  padding: 0;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--primary);
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}

.faq-item[open] summary::after {
  content: "-";
}

.faq-item h3 {
  margin-bottom: 0;
  color: var(--primary-dark);
  font-size: 18px;
}

.faq-item p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--text-soft);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--text-muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-inner p {
  margin-bottom: 0;
}

.footer-inner a {
  color: var(--primary);
  font-weight: 800;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .section {
    padding: 58px 0;
  }

  .hero {
    padding-top: 54px;
  }

  .hero-grid,
  .method-grid,
  .prompt-grid,
  .two-column,
  .cta-box,
  .conclusion-card {
    grid-template-columns: 1fr;
  }

  .method-card.wide {
    grid-column: auto;
  }

  .cta-actions {
    margin-top: 0;
  }
}

@media (max-width: 560px) {
  section,
  [id] {
    scroll-margin-top: 118px;
  }

  .container,
  .narrow {
    width: min(100% - 28px, var(--max-width));
  }

  .site-header {
    padding: 12px 14px;
  }

  h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 25px;
  }

  .hero-copy,
  .hero-visual,
  .flow-card,
  .conclusion-card,
  .method-card,
  .list-card,
  .check-panel,
  .cta-box {
    padding: 20px;
  }

  .hero-visual {
    padding: 0;
  }

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

  .hero-subtitle {
    font-size: 16px;
  }

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

  .button {
    width: 100%;
  }

  .prompt-head {
    align-items: stretch;
    flex-direction: column;
  }

  .copy-button {
    width: 100%;
  }

  pre {
    white-space: pre;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}