/* ==========================================================================
   介绍页样式（纯静态，不依赖 JS）
   结构：hero 顶条 + 能力分格带 + 各色分区色块（01~07）+ 底部 CTA / 页脚
   主色沿用工具本体 #2057a6；分区色块用蓝 / 青 / 暖橙 / 紫 / 暗夜五组色调分格
   ========================================================================== */

:root {
  --ink: #1b2330;
  --ink-soft: #35404f;
  --muted: #5c6675;
  --line: #e3e7ee;
  --soft: #f6f8fb;
  --white: #ffffff;

  --brand: #2057a6;
  --brand-dark: #17457f;
  --brand-deep: #0f2c56;
  --brand-soft: #eef4fc;

  --teal: #0f766e;
  --teal-soft: #eafaf7;
  --amber: #c2410c;
  --amber-soft: #fff4ec;
  --violet: #3f3a8f;
  --violet-soft: #f2f1fb;
  --crimson: #9f1239;
  --crimson-soft: #fdf3f5;
  --sepia: #7c4a12;
  --sepia-soft: #fdf6ec;

  --warm: #fff8f2;
  --radius: 14px;
  --maxw: 1180px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.3;
  letter-spacing: 0;
}

p {
  margin: 0;
}

ul,
ol,
dl {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

img {
  max-width: 100%;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 66px;
  padding: 10px 24px;
  border-bottom: 1px solid rgba(227, 231, 238, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.brand img {
  display: block;
  width: 32px;
  height: 32px;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 500;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  color: var(--ink-soft);
  font-size: 14px;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--brand);
}

.site-nav .nav-cta {
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-weight: 650;
  white-space: nowrap;
}

.site-nav .nav-cta:hover {
  background: var(--brand-dark);
  color: #fff;
}

/* ---------- 通用按钮 ---------- */

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  transition: background-color 0.16s, border-color 0.16s, color 0.16s;
}

.button-primary {
  background: var(--brand);
  color: #fff;
}

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

.button-secondary {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.button-light {
  background: #fff;
  color: var(--brand-deep);
}

.button-light:hover {
  background: var(--brand-soft);
}

/* ---------- Hero ---------- */

.hero {
  padding: 72px 0 64px;
  background:
    radial-gradient(900px 420px at 12% -10%, #e9f1fb 0%, rgba(233, 241, 251, 0) 70%),
    linear-gradient(180deg, #f7fafe 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}

.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 56px;
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 5px 12px 5px 10px;
  border: 1px solid rgba(32, 87, 166, 0.16);
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 13px;
  font-weight: 600;
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

.hero h1 {
  font-size: 44px;
  font-weight: 780;
}

.hero h1 em {
  display: block;
  color: var(--brand);
  font-style: normal;
}

.hero-lead {
  margin-top: 20px;
  color: var(--ink-soft);
  font-size: 17px;
  max-width: 620px;
}

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

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.hero-trust li {
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink-soft);
  font-size: 12.5px;
}

.hero-trust li strong {
  color: var(--brand);
  font-weight: 700;
}

/* hero 右侧：纯 CSS 绘制的文档示意图 */

.hero-mark {
  position: relative;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 22px 48px -30px rgba(16, 44, 86, 0.45);
}

.hero-mark-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 12px;
}

.hero-mark-tag b {
  color: var(--brand);
}

.hero-doc {
  padding: 18px 20px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fcfeff;
}

.hero-doc .line {
  height: 8px;
  margin-top: 9px;
  border-radius: 3px;
  background: #e6ecf4;
}

.hero-doc .line.h1 {
  width: 62%;
  height: 15px;
  margin-top: 0;
  background: var(--brand);
}

.hero-doc .line.h2 {
  width: 38%;
  height: 12px;
  margin-top: 18px;
  background: #9cb9dd;
}

.hero-doc .line.short {
  width: 74%;
}

.hero-doc .block {
  margin-top: 14px;
  padding: 10px 12px;
  border-left: 3px solid #9dbde6;
  border-radius: 0 6px 6px 0;
  background: #f2f6fb;
}

.hero-doc .block .line {
  margin-top: 7px;
  background: #d3e0f0;
}

.hero-doc .block .line:first-child {
  margin-top: 0;
}

.hero-doc .table {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--line);
}

.hero-doc .table span {
  height: 20px;
  background: #fff;
}

.hero-doc .table span:nth-child(-n + 3) {
  background: #e3ecf8;
}

.hero-doc .badges {
  display: flex;
  gap: 6px;
  margin-top: 14px;
}

.hero-doc .badges b {
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 650;
}

.hero-doc .badges b:nth-child(1) {
  background: var(--brand-soft);
  color: var(--brand);
}

.hero-doc .badges b:nth-child(2) {
  background: var(--crimson-soft);
  color: var(--crimson);
}

.hero-doc .badges b:nth-child(3) {
  background: var(--sepia-soft);
  color: var(--sepia);
}

.hero-doc .badges b:nth-child(4) {
  background: var(--teal-soft);
  color: var(--teal);
}

/* ---------- 能力分格带（深色） ---------- */

.proof-band {
  background: var(--brand-deep);
  color: #dbe6f5;
}

.proof-inner {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.proof-inner p {
  padding: 22px 20px;
  border-left: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 14px;
}

.proof-inner p:first-child {
  border-left: 0;
}

.proof-inner p b {
  display: block;
  margin-bottom: 4px;
  color: #fff;
  font-size: 15px;
}

/* ---------- 分区外壳 ---------- */

.section {
  padding: 76px 0;
}

.section-index {
  margin-bottom: 10px;
  color: var(--brand);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.section-head h2 {
  font-size: 32px;
  font-weight: 760;
}

.section-head > p:last-child {
  margin-top: 14px;
  max-width: 720px;
  color: var(--muted);
  font-size: 16px;
}

.section-head-light h2 {
  color: #fff;
}

.section-head-light .section-index {
  color: #8fb4e4;
}

.section-head-light > p:last-child {
  color: rgba(255, 255, 255, 0.72);
}

/* 01 工具简介 */

.overview {
  background: #fff;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.answer-grid > div {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft);
}

.answer-grid dt {
  color: var(--brand);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.answer-grid dd {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 14.5px;
}

/* 02 核心功能（六格彩色卡片） */

.features {
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

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

.feature-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--tone, var(--brand));
  border-radius: 12px;
  background: var(--tone-soft, #fff);
}

.feature-card .feature-number {
  color: var(--tone, var(--brand));
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.feature-card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 720;
}

.feature-card p {
  color: var(--ink-soft);
  font-size: 14.5px;
}

.feature-card .swatches {
  display: flex;
  gap: 6px;
  margin-top: 16px;
}

.feature-card .swatches i {
  width: 22px;
  height: 22px;
  border-radius: 6px;
}

.tone-blue {
  --tone: var(--brand);
  --tone-soft: var(--brand-soft);
}

.tone-teal {
  --tone: var(--teal);
  --tone-soft: var(--teal-soft);
}

.tone-amber {
  --tone: var(--amber);
  --tone-soft: var(--amber-soft);
}

.tone-violet {
  --tone: var(--violet);
  --tone-soft: var(--violet-soft);
}

.tone-crimson {
  --tone: var(--crimson);
  --tone-soft: var(--crimson-soft);
}

.tone-sepia {
  --tone: var(--sepia);
  --tone-soft: var(--sepia-soft);
}

/* 03 输出效果（暖色分区 + 四张成品小样） */

.showcase {
  background: var(--warm);
  border-bottom: 1px solid #f2e6da;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 34px;
}

.spec-card {
  border: 1px solid #efe2d5;
  border-radius: 12px;
  background: #fff;
  overflow: hidden;
}

.spec-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid #f2e6da;
  font-size: 13px;
}

.spec-head i {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--c, var(--brand));
}

.spec-head b {
  font-weight: 700;
}

.spec-head span {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

.mini {
  padding: 16px 15px 18px;
  font-size: 11.5px;
  line-height: 1.6;
  color: #3a4150;
}

.mini-title {
  color: var(--c, var(--brand));
  font-size: 15px;
  font-weight: 750;
}

.mini-rule {
  display: block;
  height: 2px;
  margin: 8px 0 10px;
  background: var(--c, var(--brand));
}

.mini-text {
  color: #4a5464;
}

.mini-table {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 10px;
  border: 1px solid #e6e9ef;
  border-radius: 5px;
  overflow: hidden;
  background: #e6e9ef;
}

.mini-table span {
  padding: 4px 7px;
  background: #fff;
}

.mini-table .mh {
  background: var(--c-head, var(--brand-soft));
  font-weight: 700;
}

.mini-quote {
  margin-top: 10px;
  padding: 6px 9px;
  border-left: 3px solid var(--c-bar, #9dbde6);
  border-radius: 0 4px 4px 0;
  background: var(--c-soft, var(--brand-soft));
  color: #4a5464;
}

.mini-list {
  margin-top: 9px;
  padding-left: 4px;
}

.mini-list li {
  position: relative;
  padding-left: 12px;
}

.mini-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-bar, #9dbde6);
}

.showcase-note {
  margin-top: 22px;
  color: #6b5b4c;
  font-size: 14.5px;
}

/* 04 使用流程（暗色分格） */

.steps {
  background: #16233c;
  color: #fff;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 34px 0 30px;
}

.step-list li {
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.step-list span {
  display: inline-block;
  margin-bottom: 12px;
  color: #7fb0ea;
  font-size: 22px;
  font-weight: 780;
  line-height: 1;
}

.step-list h3 {
  margin-bottom: 6px;
  font-size: 16.5px;
  font-weight: 700;
}

.step-list p {
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.step-cta {
  display: inline-flex;
}

/* 05 适用场景 + 能力表 */

.scenarios {
  background: #fff;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 34px;
}

.scenario-grid article {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.scenario-grid article:nth-child(1) {
  border-top: 3px solid var(--brand);
}

.scenario-grid article:nth-child(2) {
  border-top: 3px solid var(--teal);
}

.scenario-grid article:nth-child(3) {
  border-top: 3px solid var(--violet);
}

.scenario-grid article:nth-child(4) {
  border-top: 3px solid var(--sepia);
}

.scenario-grid article:nth-child(5) {
  border-top: 3px solid var(--crimson);
}

.scenario-grid article:nth-child(6) {
  border-top: 3px solid var(--amber);
}

.scenario-grid h3 {
  margin-bottom: 8px;
  font-size: 16.5px;
  font-weight: 720;
}

.scenario-grid p {
  color: var(--muted);
  font-size: 14.5px;
}

.capability {
  margin-top: 44px;
}

.capability h3 {
  margin-bottom: 14px;
  font-size: 18px;
  font-weight: 720;
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14.5px;
}

th,
td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

thead th {
  background: var(--soft);
  font-weight: 700;
  white-space: nowrap;
}

tbody th {
  font-weight: 600;
}

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

.status-yes,
.status-no {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 650;
  white-space: nowrap;
}

.status-yes {
  background: var(--teal-soft);
  color: var(--teal);
}

.status-no {
  background: #f4f5f7;
  color: #6b7280;
}

/* 06 隐私 */

.privacy {
  background: #eef6fb;
  border-top: 1px solid #dceaf5;
  border-bottom: 1px solid #dceaf5;
}

.privacy .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.8fr);
  gap: 56px;
  align-items: center;
}

.privacy h2 {
  font-size: 30px;
  font-weight: 760;
}

.privacy p {
  margin-top: 14px;
  color: var(--ink-soft);
}

.privacy-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.privacy-facts div {
  padding: 20px 14px;
  border: 1px solid #d5e7f4;
  border-radius: 12px;
  background: #fff;
  text-align: center;
}

.privacy-facts strong {
  display: block;
  color: var(--brand);
  font-size: 26px;
  font-weight: 780;
  line-height: 1.2;
}

.privacy-facts span {
  color: var(--muted);
  font-size: 13px;
}

/* 07 常见问题 */

.faq {
  background: #fff;
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 30px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft);
}

.faq-list details[open] {
  background: #fff;
  border-color: #cddcf0;
}

.faq-list summary {
  padding: 16px 18px;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 650;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  float: right;
  color: var(--brand);
  font-weight: 700;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  padding: 0 18px 16px;
  color: var(--muted);
  font-size: 14.5px;
}

/* 底部 CTA + 页脚 */

.final-cta {
  padding: 66px 0;
  background: linear-gradient(135deg, #1b4b8f 0%, #123258 100%);
  color: #fff;
  text-align: center;
}

.final-cta p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14.5px;
}

.final-cta h2 {
  margin: 10px 0 22px;
  font-size: 32px;
  font-weight: 760;
}

footer {
  padding: 34px 0;
  background: #101827;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13.5px;
}

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

.footer-inner strong {
  display: block;
  color: #fff;
  font-size: 15px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.footer-links a:hover {
  color: #fff;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1024px) {
  .hero {
    padding: 56px 0 48px;
  }

  .hero .wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .feature-grid,
  .showcase-grid,
  .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .proof-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .proof-inner p:nth-child(3) {
    border-left: 0;
  }

  .privacy .wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 15.5px;
  }

  .site-header {
    padding: 10px 16px;
  }

  .site-nav {
    gap: 14px;
  }

  .site-nav a:not(.nav-cta) {
    display: none;
  }

  .wrap {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 31px;
  }

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

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .button {
    padding: 11px 18px;
    font-size: 14.5px;
  }

  .section {
    padding: 52px 0;
  }

  .section-head h2,
  .privacy h2,
  .final-cta h2 {
    font-size: 24px;
  }

  .feature-grid,
  .showcase-grid,
  .step-list,
  .faq-list,
  .proof-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .proof-inner p {
    padding: 15px 0;
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
  }

  .proof-inner p:first-child {
    border-top: 0;
  }

  .privacy-facts {
    gap: 8px;
  }

  .privacy-facts strong {
    font-size: 22px;
  }

  .brand small {
    display: none;
  }
}

@media print {
  .site-header,
  .final-cta,
  footer {
    display: none;
  }
}