:root {
  --text: #1f2329;
  --muted: #667085;
  --line: #e6e8ec;
  --soft: #f6f7f9;
  --brand: #d71920;
  --brand-dark: #aa1117;
  --ink: #121418;
  --green: #0d7a4f;
  --gold: #a96f00;
  --shadow: 0 18px 50px rgba(18, 20, 24, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  color: var(--text);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 14px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 190px;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: -3px;
  color: var(--muted);
  font-size: 11px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 4px;
  min-width: 0;
}

.nav a,
.channel-menu a {
  padding: 8px 12px;
  border-radius: 8px;
  color: #363b44;
  font-size: 14px;
}

.nav a:hover,
.channel-menu a:hover,
.channel-menu a.active {
  color: var(--brand);
  background: #fff1f1;
}

.header-cta,
.primary-action,
.search-box button {
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-weight: 700;
  cursor: pointer;
}

.header-cta {
  padding: 10px 16px;
  white-space: nowrap;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 36px;
  align-items: center;
  padding: 68px clamp(18px, 5vw, 72px) 42px;
  background:
    radial-gradient(circle at 78% 20%, rgba(215, 25, 32, 0.08), transparent 28%),
    linear-gradient(110deg, rgba(215, 25, 32, 0.1), transparent 52%),
    linear-gradient(180deg, #fff, #f8fafc);
}

.hero-content {
  max-width: 920px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 28px;
  line-height: 1.25;
}

h3 {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 20px;
}

.hero-copy {
  max-width: 840px;
  color: #4b5563;
  font-size: 20px;
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 22px 0 4px;
  color: #4b5563;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  font-weight: 800;
}

.hero-actions strong {
  color: var(--brand-dark);
}

.hero-points,
.contact-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.hero-points span,
.contact-points span {
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 800;
}

.hero-points span {
  color: #8a1015;
  background: #fff0f1;
}

.contact-points span {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.search-box {
  display: flex;
  max-width: 760px;
  margin: 26px 0 14px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow);
}

.search-box input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  padding: 12px 14px;
  font-size: 16px;
}

.search-box button {
  padding: 0 20px;
}

.quick-tags,
.ticker {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.quick-tags button,
.ticker span {
  border: 1px solid #f2c8ca;
  border-radius: 999px;
  padding: 7px 12px;
  color: var(--brand-dark);
  background: #fff7f7;
  font-size: 13px;
}

.quick-tags button {
  cursor: pointer;
}

.hot-panel {
  align-self: stretch;
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.panel-title {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-weight: 900;
}

.hot-panel ol {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hot-panel a {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 10px;
  align-items: start;
  font-weight: 700;
}

.hot-panel span {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 6px;
  color: #fff;
  background: var(--brand);
  font-size: 12px;
}

.ticker {
  padding: 18px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.layout {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 36px;
  max-width: 1380px;
  margin: 0 auto;
  padding: 34px clamp(18px, 5vw, 72px) 60px;
}

.content-stream {
  min-width: 0;
}

.channel-menu {
  position: sticky;
  top: 86px;
  display: grid;
  align-self: start;
  gap: 4px;
  padding: 10px;
  border-right: 1px solid var(--line);
}

.section-head {
  margin-bottom: 18px;
}

.section-head p:not(.eyebrow) {
  max-width: 760px;
  color: var(--muted);
}

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

.model-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.model-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.model-card.featured {
  grid-column: span 2;
  display: flex;
  min-height: 300px;
  border-color: #f1b8bb;
  background: linear-gradient(135deg, #fff, #fff7f7);
}

.card-copy {
  padding: 22px;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.card-meta span {
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--brand-dark);
  background: #fff1f1;
  font-size: 12px;
  font-weight: 800;
}

.model-card p,
.model-card li {
  color: #4b5563;
}

.model-card ul {
  margin: 16px 0 0;
  padding-left: 18px;
}

.note {
  padding: 12px;
  border-left: 3px solid var(--brand);
  background: #fff8f8;
}

.image-card img {
  width: 100%;
  height: 230px;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.compare,
.industries,
.faq,
.risk {
  margin-top: 46px;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
  background: #fff;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #fff;
  background: #22252b;
  font-size: 14px;
}

td {
  color: #4b5563;
}

.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.industry-grid article,
.faq-list article,
.risk {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.industry-grid p,
.faq-list p,
.risk p {
  margin-bottom: 0;
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.risk {
  border-color: #f0d2aa;
  background: #fffaf2;
}

.risk h2 {
  color: var(--gold);
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 30px;
  align-items: center;
  padding: 56px clamp(18px, 5vw, 72px);
  color: #fff;
  background:
    radial-gradient(circle at 80% 50%, rgba(215, 25, 32, 0.18), transparent 28%),
    linear-gradient(135deg, #171a20, #23272f);
}

.contact h2,
.contact p,
.contact .eyebrow {
  color: #fff;
}

.contact p {
  max-width: 780px;
  margin-bottom: 18px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 17px;
}

.wechat-copy {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 18px;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
}

.wechat-copy span {
  color: rgba(255, 255, 255, 0.74);
}

.wechat-copy strong {
  color: #fff;
  font-size: 22px;
  letter-spacing: 0.02em;
}

.qr-card {
  margin: 0;
  padding: 14px;
  border-radius: 8px;
  background: #fff;
  text-align: center;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
}

.qr-card img {
  width: 100%;
  border-radius: 6px;
}

.qr-card figcaption {
  margin-top: 8px;
  color: var(--brand-dark);
  font-weight: 800;
  font-size: 14px;
}

footer {
  padding: 22px clamp(18px, 5vw, 72px) 76px;
  color: var(--muted);
  background: #f8fafc;
  font-size: 14px;
}

footer p {
  margin: 0;
}

.is-hidden {
  display: none;
}

.mobile-contact-bar {
  position: fixed;
  right: 14px;
  bottom: 14px;
  left: 14px;
  z-index: 30;
  display: none;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  min-width: 0;
  padding: 12px 14px;
  border-radius: 12px;
  color: #fff;
  background: var(--brand);
  box-shadow: 0 16px 40px rgba(170, 17, 23, 0.28);
}

.mobile-contact-bar span {
  font-size: 13px;
  opacity: 0.86;
}

.mobile-contact-bar strong {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 18px;
}

.mobile-contact-bar em {
  border-radius: 999px;
  padding: 5px 10px;
  color: var(--brand-dark);
  background: #fff;
  font-style: normal;
  font-weight: 800;
}

@media (max-width: 1060px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

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

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

  .channel-menu {
    position: static;
    grid-auto-flow: column;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

@media (max-width: 720px) {
  body {
    padding-bottom: 74px;
  }

  .site-header {
    position: static;
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 12px 14px;
    overflow: hidden;
  }

  .brand {
    min-width: 0;
  }

  .brand strong {
    font-size: 16px;
  }

  .brand small {
    display: none;
  }

  .nav {
    margin: 0 -4px;
    gap: 2px;
    width: calc(100vw - 20px);
    max-width: calc(100vw - 20px);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar,
  .channel-menu::-webkit-scrollbar,
  .ticker::-webkit-scrollbar {
    display: none;
  }

  .nav a {
    flex: 0 0 auto;
    padding: 7px 10px;
    font-size: 13px;
  }

  .header-cta {
    display: none;
  }

  .hero {
    padding: 28px 14px 22px;
    gap: 18px;
  }

  h1 {
    font-size: 32px;
    line-height: 1.14;
  }

  h2 {
    font-size: 23px;
  }

  h3 {
    font-size: 18px;
  }

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

  .hero-actions {
    align-items: stretch;
  }

  .primary-action,
  .hero-actions span {
    width: 100%;
  }

  .hero-actions span {
    padding: 10px 12px;
    border-radius: 8px;
    background: #fff;
  }

  .search-box {
    flex-direction: column;
    margin-top: 18px;
  }

  .search-box button {
    padding: 12px;
  }

  .hot-panel {
    padding: 16px;
  }

  .ticker {
    flex-wrap: nowrap;
    overflow-x: auto;
    max-width: 100vw;
    padding: 12px 14px;
    -webkit-overflow-scrolling: touch;
  }

  .ticker span {
    flex: 0 0 auto;
  }

  .layout {
    gap: 20px;
    padding: 22px 14px 42px;
    max-width: 100vw;
  }

  .channel-menu {
    display: flex;
    margin: 0 -14px;
    padding: 8px 14px;
    max-width: 100vw;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .channel-menu a {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .card-copy {
    padding: 18px;
  }

  .model-card {
    min-height: 0;
  }

  .image-card img {
    width: 100%;
    height: auto;
    max-height: none;
    object-fit: contain;
  }

  .compare,
  .industries,
.faq,
  .risk {
    margin-top: 34px;
  }

  .table-wrap {
    overflow: visible;
    border: 0;
    border-radius: 0;
  }

  table,
  thead,
  tbody,
  tr,
  th,
  td {
    display: block;
  }

  table {
    min-width: 0;
  }

  thead {
    display: none;
  }

  tbody {
    display: grid;
    gap: 12px;
  }

  tr {
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
  }

  td {
    display: grid;
    grid-template-columns: 86px minmax(0, 1fr);
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px solid #f0f1f3;
    font-size: 13px;
    word-break: break-word;
  }

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

  td::before {
    color: var(--muted);
    font-weight: 800;
  }

  td:nth-child(1)::before {
    content: "模式";
  }

  td:nth-child(2)::before {
    content: "门槛";
  }

  td:nth-child(3)::before {
    content: "回本";
  }

  td:nth-child(4)::before {
    content: "机制";
  }

  td:nth-child(5)::before {
    content: "关键词";
  }

  td:nth-child(6)::before {
    content: "风险";
  }

  .model-grid,
  .model-card.featured,
  .industry-grid,
  .contact {
    grid-template-columns: 1fr;
  }

  .model-card.featured {
    grid-column: 1 / -1;
    display: flex;
  }

  .contact {
    gap: 20px;
    padding: 34px 14px;
  }

  .qr-card {
    justify-self: center;
    width: min(100%, 260px);
  }

  footer {
    padding: 18px 14px 90px;
  }

  .mobile-contact-bar {
    display: grid;
  }
}

@media (max-width: 420px) {
  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .hero,
  .layout,
  .contact {
    padding-left: 12px;
    padding-right: 12px;
  }

  .quick-tags {
    gap: 8px;
  }

  .quick-tags button {
    flex: 1 1 calc(50% - 8px);
    min-width: 0;
  }

  .hot-panel a {
    grid-template-columns: 22px minmax(0, 1fr);
    font-size: 14px;
  }

  .card-copy {
    padding: 16px;
  }

  .wechat-copy {
    display: grid;
    width: 100%;
  }

  .qr-card {
    width: min(100%, 230px);
  }

  .mobile-contact-bar {
    right: 10px;
    bottom: 10px;
    left: 10px;
    padding: 10px 12px;
  }
}