/* =========================================================
   DahongAI Website V3 Full Refinement
   桌面端：国际化企业官网 / SaaS 官网
   移动端：手机浏览器优先，稳定换行、按钮全宽、导航可用
   ========================================================= */

:root {
  --v3-bg: #f6f8fb;
  --v3-text: #071a38;
  --v3-heading: #041530;
  --v3-muted: #657a96;
  --v3-soft: #eef4fb;
  --v3-line: rgba(15, 55, 105, .105);
  --v3-blue: #0b66ff;
  --v3-blue-2: #1677ff;
  --v3-cyan: #36d4ff;
  --v3-green: #00a6b4;
  --v3-orange: #ff8a1e;
  --v3-card: rgba(255, 255, 255, .94);
  --v3-shadow: 0 16px 46px rgba(10, 40, 86, .075);
  --v3-shadow-strong: 0 24px 80px rgba(2, 18, 45, .22);
  --v3-radius: 22px;
  --v3-max: 1168px;
}

/* ---------- Base ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  overflow-x: hidden;
  background: var(--v3-bg) !important;
  color: var(--v3-text) !important;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif !important;
  font-size: 15px !important;
  line-height: 1.74 !important;
  letter-spacing: -0.006em !important;
  text-rendering: geometricPrecision;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(var(--v3-max), calc(100% - 72px)) !important;
  margin-inline: auto !important;
}

.section {
  padding: 72px 0 !important;
}

.section.compact {
  padding: 50px 0 !important;
}

.section-title {
  max-width: 740px !important;
  margin: 0 auto 34px !important;
}

.eyebrow {
  font-size: 11.5px !important;
  line-height: 1 !important;
  letter-spacing: .16em !important;
  font-weight: 820 !important;
  text-transform: uppercase !important;
  margin-bottom: 14px !important;
}

.eyebrow::before {
  width: 24px !important;
  height: 2px !important;
}

h1,
.page-hero h1 {
  max-width: 880px !important;
  color: inherit;
  font-size: clamp(32px, 3.45vw, 46px) !important;
  line-height: 1.12 !important;
  letter-spacing: -0.052em !important;
  font-weight: 850 !important;
  text-wrap: balance;
  margin-bottom: 18px !important;
}

h2,
.section-title h2 {
  font-size: clamp(25px, 2.45vw, 34px) !important;
  line-height: 1.18 !important;
  letter-spacing: -0.045em !important;
  font-weight: 830 !important;
  margin-bottom: 12px !important;
  color: var(--v3-heading);
  text-wrap: balance;
}

h3 {
  font-size: 17.5px !important;
  line-height: 1.36 !important;
  letter-spacing: -0.025em !important;
  font-weight: 800 !important;
  margin-bottom: 10px !important;
  color: var(--v3-heading);
}

p,
.lead,
.card p,
.section-title p,
.page-hero .lead {
  font-size: 15px !important;
  line-height: 1.78 !important;
  letter-spacing: -0.002em !important;
}

.lead,
.section-title p,
.card p,
.feature span,
.step p {
  color: var(--v3-muted) !important;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}

.btn {
  min-height: 41px !important;
  padding: 0 17px !important;
  border-radius: 12px !important;
  font-size: 13.5px !important;
  font-weight: 800 !important;
  letter-spacing: 0 !important;
  box-shadow: none !important;
}

.btn:hover {
  transform: translateY(-1px) !important;
  box-shadow: 0 10px 24px rgba(11, 102, 255, .18) !important;
}

.btn.primary {
  background: linear-gradient(135deg, #0b66ff, #1688ff) !important;
}

.btn.secondary {
  background: rgba(255, 255, 255, .075) !important;
  border-color: rgba(255, 255, 255, .22) !important;
}

.btn.ghost {
  border-color: rgba(11, 102, 255, .18) !important;
  background: rgba(255,255,255,.86) !important;
}

/* ---------- Header / Nav ---------- */

.topbar {
  height: 66px !important;
  background: rgba(255,255,255,.92) !important;
  border-bottom: 1px solid rgba(7,27,62,.075) !important;
  backdrop-filter: blur(18px) saturate(1.2) !important;
}

.nav {
  height: 66px !important;
}

.logo {
  min-width: 292px !important;
}

.logo img {
  width: 252px !important;
}

.nav-links {
  gap: 22px !important;
  font-size: 13.5px !important;
  font-weight: 760 !important;
  color: #1e3554 !important;
}

.nav-links a {
  padding: 21px 0 !important;
}

.nav-links a.active::after,
.nav-links a:hover::after {
  bottom: 10px !important;
  height: 2px !important;
}

.nav-cta .btn,
.nav-contact {
  min-height: 38px !important;
  padding: 0 15px !important;
  border-radius: 11px !important;
  font-size: 13px !important;
  white-space: nowrap;
}

.menu-btn {
  display: none;
}

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

.hero {
  min-height: 620px !important;
  background:
    radial-gradient(circle at 78% 32%, rgba(20, 117, 255, .26), transparent 30%),
    radial-gradient(circle at 8% 18%, rgba(54, 212, 255, .10), transparent 26%),
    linear-gradient(135deg, #061831 0%, #082b5c 54%, #040f20 100%) !important;
}

.hero::after {
  height: 92px !important;
  background: linear-gradient(180deg, transparent, rgba(246,248,251,.98)) !important;
}

.hero-grid {
  min-height: 620px !important;
  grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr) !important;
  gap: 56px !important;
  padding-top: 0 !important;
}

.hero-grid > div:first-child {
  max-width: 575px !important;
  padding-top: 0 !important;
}

.hero-bg {
  inset: -2% -7% 0 50% !important;
  opacity: .65 !important;
  transform: scale(.84) !important;
  transform-origin: center right !important;
}

.hero-panel {
  width: min(100%, 545px) !important;
  justify-self: end !important;
  align-self: center !important;
  margin-bottom: 0 !important;
  padding: 13px !important;
  border-radius: 24px !important;
  background: rgba(3, 21, 48, .38) !important;
  border: 1px solid rgba(111, 205, 255, .14) !important;
  box-shadow: var(--v3-shadow-strong) !important;
  transform: translateY(16px) !important;
}

.hero-panel img {
  border-radius: 18px !important;
}

.hero h1,
.hero-title {
  max-width: 570px !important;
  font-size: clamp(38px, 3.85vw, 54px) !important;
  line-height: 1.08 !important;
  letter-spacing: -0.058em !important;
  font-weight: 860 !important;
  margin-bottom: 20px !important;
}

.hero h1 span,
.hero-title span {
  color: var(--v3-cyan) !important;
  letter-spacing: -0.046em !important;
}

.hero .eyebrow {
  margin-bottom: 16px !important;
  color: #86eaff !important;
}

.hero .lead {
  max-width: 540px !important;
  font-size: 15.8px !important;
  line-height: 1.88 !important;
  color: rgba(232, 245, 255, .76) !important;
}

.hero-actions {
  gap: 11px !important;
  margin: 28px 0 24px !important;
}

.hero-tags {
  max-width: 530px !important;
  gap: 8px !important;
  font-size: 12px !important;
  color: rgba(235,247,255,.60) !important;
}

.hero-tags span {
  padding: 5px 9px !important;
  background: rgba(255,255,255,.045) !important;
  border-color: rgba(255,255,255,.12) !important;
}

.hero-tags span::before {
  color: #64e0ff !important;
}

/* ---------- Proof Strip ---------- */

.proof-strip {
  margin-top: -26px !important;
}

.proof-grid {
  border-radius: 18px !important;
  box-shadow: 0 14px 40px rgba(8,41,92,.08) !important;
}

.proof-item {
  padding: 18px 18px !important;
}

.proof-item strong {
  font-size: 15px !important;
  line-height: 1.25 !important;
  margin-bottom: 3px !important;
}

.proof-item span {
  font-size: 11.5px !important;
  line-height: 1.45 !important;
}

/* ---------- Cards / Modules ---------- */

.grid-3 {
  gap: 18px !important;
}

.grid-4 {
  gap: 16px !important;
}

.card {
  border-radius: 20px !important;
  padding: 23px !important;
  border-color: var(--v3-line) !important;
  box-shadow: var(--v3-shadow) !important;
}

.card .icon {
  width: 40px !important;
  height: 40px !important;
  border-radius: 13px !important;
  font-size: 16px !important;
  margin-bottom: 15px !important;
}

.challenge .card {
  min-height: 178px !important;
  padding: 20px 18px !important;
}

.challenge .big-icon {
  font-size: 26px !important;
  margin-bottom: 9px !important;
}

.service-card {
  min-height: 360px !important;
}

.service-card .label {
  font-size: 10.8px !important;
  padding: 4px 9px !important;
  margin-bottom: 14px !important;
}

.check-list {
  gap: 7px !important;
  font-size: 13.5px !important;
  margin: 15px 0 20px !important;
}

.check-list li {
  padding-left: 23px !important;
}

.product-showcase {
  border-radius: 26px !important;
  padding: 32px !important;
  box-shadow: 0 18px 54px rgba(8,41,92,.09) !important;
}

.product-showcase .grid-2 {
  gap: 28px !important;
}

.product-chips {
  gap: 7px !important;
  margin: 16px 0 22px !important;
}

.chip {
  font-size: 11.8px !important;
  padding: 5px 9px !important;
}

.feature-grid {
  gap: 14px !important;
  margin-top: 24px !important;
}

.feature {
  padding: 16px !important;
  border-radius: 16px !important;
}

.feature strong {
  font-size: 14px !important;
  margin-bottom: 5px !important;
}

.feature span {
  font-size: 12.8px !important;
  line-height: 1.6 !important;
}

.loop-steps {
  gap: 14px !important;
}

.step {
  padding: 20px !important;
  border-radius: 18px !important;
}

.step b {
  width: 29px !important;
  height: 29px !important;
  border-radius: 10px !important;
  font-size: 12.5px !important;
}

.solution-card {
  min-height: 250px !important;
}

/* ---------- Inner Pages ---------- */

.page-hero {
  padding: 68px 0 56px !important;
  background:
    radial-gradient(circle at 76% 22%, rgba(54,212,255,.22), transparent 32%),
    linear-gradient(135deg, #061831 0%, #082d64 58%, #040f20 100%) !important;
}

.page-hero .breadcrumb {
  font-size: 12.5px !important;
  margin-bottom: 14px !important;
}

.page-hero .lead {
  max-width: 720px !important;
  font-size: 15.5px !important;
  color: rgba(235,247,255,.73) !important;
}

.matrix {
  grid-template-columns: 270px 1fr !important;
  gap: 22px !important;
}

.side-card {
  top: 88px !important;
}

.mini-nav a {
  font-size: 13px !important;
  padding: 10px 12px !important;
}

.timeline-item {
  padding-left: 54px !important;
}

.timeline-item::before {
  width: 26px !important;
  height: 26px !important;
}

/* ---------- CTA / Form / Footer ---------- */

.cta {
  border-radius: 26px !important;
  padding: 38px !important;
  gap: 28px !important;
}

.contact-block {
  gap: 24px !important;
}

.form-card,
.info-panel {
  border-radius: 23px !important;
  padding: 28px !important;
}

.form-grid {
  gap: 14px !important;
}

.field {
  gap: 6px !important;
  margin-bottom: 14px !important;
}

label {
  font-size: 12.8px !important;
  font-weight: 760 !important;
}

input,
textarea,
select {
  min-height: 43px !important;
  border-radius: 12px !important;
  padding: 10px 13px !important;
  font-size: 13.5px !important;
}

textarea {
  min-height: 104px !important;
}

.footer {
  padding: 48px 0 24px !important;
}

.footer-grid {
  gap: 34px !important;
}

.footer h4 {
  font-size: 14.5px !important;
}

.footer p,
.footer a,
.footer li,
.footer-bottom {
  font-size: 12.8px !important;
  line-height: 1.65 !important;
}

/* ---------- Desktop Fine Tune ---------- */

@media (min-width: 1440px) {
  .container {
    width: min(1180px, calc(100% - 96px)) !important;
  }

  .hero h1,
  .hero-title {
    font-size: 54px !important;
  }

  .hero .lead {
    font-size: 15.8px !important;
  }
}

@media (max-width: 1220px) {
  .container {
    width: min(100% - 48px, var(--v3-max)) !important;
  }

  .logo {
    min-width: 250px !important;
  }

  .logo img {
    width: 226px !important;
  }

  .nav-links {
    gap: 15px !important;
    font-size: 12.8px !important;
  }

  .hero-grid {
    grid-template-columns: minmax(0, .96fr) minmax(0, 1.04fr) !important;
    gap: 34px !important;
  }

  .hero h1,
  .hero-title {
    font-size: clamp(36px, 4.8vw, 48px) !important;
  }
}

/* ---------- Tablet / Mobile Navigation ---------- */

@media (max-width: 1080px) {
  .topbar,
  .nav {
    height: 64px !important;
  }

  .logo {
    min-width: auto !important;
  }

  .logo img {
    width: 220px !important;
  }

  .menu-btn {
    display: inline-grid !important;
    place-items: center !important;
    width: 40px !important;
    height: 40px !important;
    border-radius: 12px !important;
    border: 1px solid rgba(11,102,255,.13) !important;
    background: #eef5ff !important;
    color: #0b2b5a !important;
  }

  .nav-links {
    position: fixed !important;
    inset: 64px 12px auto 12px !important;
    z-index: 999 !important;
    display: none !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 8px !important;
    padding: 14px !important;
    border-radius: 18px !important;
    background: rgba(255,255,255,.98) !important;
    box-shadow: 0 22px 60px rgba(5,26,61,.18) !important;
    border: 1px solid rgba(7,27,62,.08) !important;
  }

  .nav-links.open {
    display: grid !important;
  }

  .nav-links a {
    display: block !important;
    padding: 10px 12px !important;
    border-radius: 12px !important;
    background: #f6f9fd !important;
    font-size: 13px !important;
  }

  .nav-links a.active,
  .nav-links a:hover {
    background: #eaf3ff !important;
  }

  .nav-links a::after {
    display: none !important;
  }

  .nav-cta .btn {
    display: none !important;
  }

  .hero {
    min-height: auto !important;
  }

  .hero-grid {
    min-height: auto !important;
    grid-template-columns: 1fr !important;
    padding: 82px 0 104px !important;
  }

  .hero-grid > div:first-child {
    max-width: 700px !important;
  }

  .hero-bg {
    inset: 34% -14% 0 6% !important;
    opacity: .18 !important;
    transform: scale(1) !important;
  }

  .hero-panel {
    display: none !important;
  }

  .hero h1,
  .hero-title {
    font-size: clamp(36px, 7vw, 50px) !important;
  }

  .proof-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }

  .grid-3,
  .grid-4,
  .feature-grid,
  .loop-steps,
  .footer-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }

  .grid-2,
  .product-showcase .grid-2,
  .contact-block,
  .cta,
  .matrix {
    grid-template-columns: 1fr !important;
  }

  .side-card {
    position: static !important;
  }

  .matrix .section.compact {
    padding: 34px 0 !important;
  }
}

/* ---------- Mobile First Refinement ---------- */

@media (max-width: 680px) {
  :root {
    --v3-radius: 18px;
  }

  body {
    font-size: 14.5px !important;
    line-height: 1.72 !important;
  }

  .container {
    width: min(100% - 28px, var(--v3-max)) !important;
  }

  .topbar,
  .nav {
    height: 62px !important;
  }

  .logo img {
    width: 196px !important;
  }

  .menu-btn {
    width: 38px !important;
    height: 38px !important;
    font-size: 18px !important;
  }

  .nav-links {
    inset: 62px 10px auto 10px !important;
    grid-template-columns: 1fr !important;
    max-height: calc(100vh - 82px) !important;
    overflow-y: auto !important;
  }

  .hero-grid {
    padding: 68px 0 92px !important;
  }

  .hero-bg {
    inset: 38% -34% 0 2% !important;
    opacity: .14 !important;
  }

  .hero .eyebrow {
    font-size: 10.8px !important;
    margin-bottom: 13px !important;
  }

  .hero h1,
  .hero-title {
    font-size: clamp(32px, 10.2vw, 42px) !important;
    line-height: 1.1 !important;
    letter-spacing: -0.055em !important;
    max-width: 360px !important;
  }

  .hero .lead {
    font-size: 14.8px !important;
    line-height: 1.84 !important;
    max-width: 100% !important;
  }

  .hero-actions {
    display: grid !important;
    grid-template-columns: 1fr !important;
    gap: 10px !important;
    margin: 26px 0 0 !important;
  }

  .hero-actions .btn {
    width: 100% !important;
  }

  .hero-tags {
    display: none !important;
  }

  .proof-strip {
    margin-top: -22px !important;
  }

  .proof-grid {
    grid-template-columns: 1fr !important;
    overflow: hidden !important;
  }

  .proof-item {
    padding: 16px 18px !important;
    border-right: 0 !important;
    border-bottom: 1px solid var(--v3-line) !important;
  }

  .proof-item:last-child {
    border-bottom: 0 !important;
  }

  .section {
    padding: 56px 0 !important;
  }

  .section.compact {
    padding: 42px 0 !important;
  }

  .section-title {
    text-align: left !important;
    margin-bottom: 24px !important;
  }

  .section-title .eyebrow {
    justify-content: flex-start !important;
  }

  h1,
  .page-hero h1 {
    font-size: 30px !important;
    line-height: 1.14 !important;
    letter-spacing: -0.048em !important;
  }

  h2,
  .section-title h2 {
    font-size: 25px !important;
    line-height: 1.2 !important;
    letter-spacing: -0.043em !important;
  }

  h3 {
    font-size: 17px !important;
  }

  p,
  .lead,
  .card p,
  .section-title p,
  .page-hero .lead {
    font-size: 14.5px !important;
    line-height: 1.74 !important;
  }

  .btn {
    width: auto !important;
    min-height: 42px !important;
    font-size: 13.5px !important;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .feature-grid,
  .loop-steps,
  .footer-grid,
  .form-grid {
    grid-template-columns: 1fr !important;
    gap: 14px !important;
  }

  .card,
  .product-showcase,
  .cta,
  .form-card,
  .info-panel {
    padding: 20px !important;
    border-radius: 18px !important;
  }

  .challenge .card,
  .service-card,
  .solution-card {
    min-height: auto !important;
  }

  .card .icon {
    width: 38px !important;
    height: 38px !important;
    border-radius: 12px !important;
  }

  .product-showcase img {
    margin-top: 10px !important;
  }

  .feature-grid {
    margin-top: 18px !important;
  }

  .feature {
    padding: 15px !important;
  }

  .page-hero {
    padding: 58px 0 46px !important;
  }

  .page-hero .breadcrumb {
    font-size: 12px !important;
  }

  .mini-nav {
    grid-template-columns: 1fr 1fr !important;
    display: grid !important;
  }

  .mini-nav a {
    font-size: 12.5px !important;
    padding: 9px 10px !important;
  }

  .timeline::before {
    left: 14px !important;
  }

  .timeline-item {
    padding-left: 46px !important;
  }

  .timeline-item::before {
    left: 1px !important;
    width: 26px !important;
    height: 26px !important;
  }

  .cta {
    display: block !important;
  }

  .cta .btn {
    margin-top: 18px !important;
    width: 100% !important;
  }

  input,
  textarea,
  select {
    min-height: 44px !important;
    font-size: 14px !important;
  }

  .footer {
    padding: 42px 0 22px !important;
  }

  .footer img {
    max-width: 220px !important;
  }

  .footer-bottom {
    gap: 8px !important;
  }
}

/* ---------- Very Small Phones ---------- */

@media (max-width: 380px) {
  .container {
    width: min(100% - 22px, var(--v3-max)) !important;
  }

  .logo img {
    width: 178px !important;
  }

  .hero h1,
  .hero-title {
    font-size: 31px !important;
  }

  h1,
  .page-hero h1 {
    font-size: 28px !important;
  }

  h2,
  .section-title h2 {
    font-size: 23px !important;
  }

  .card,
  .product-showcase,
  .cta,
  .form-card,
  .info-panel {
    padding: 17px !important;
  }
}

/* Contact anti-harvest refinement */
.info-panel strong {
  color: #ffffff;
  font-weight: 820;
}

.info-panel p {
  margin-bottom: 12px;
}

.info-panel ul li {
  margin-bottom: 7px;
}

@media (max-width: 680px) {
  .info-panel p strong {
    display: block;
    margin-bottom: 6px;
  }
}