:root {
  --ink: #15201c;
  --muted-ink: #53605b;
  --line: #d9e1dd;
  --paper: #fbfcfb;
  --soft: #eef4f1;
  --blue: #176b87;
  --blue-dark: #0f5068;
  --green: #26735a;
  --amber: #b97922;
  --white: #ffffff;
  --shadow: 0 18px 44px rgba(19, 35, 30, 0.12);
  --radius: 8px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  letter-spacing: 0;
}

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

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

a:hover {
  color: var(--blue);
}

button,
input,
textarea {
  font: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  min-height: 72px;
  padding: 12px max(20px, calc((100vw - var(--container)) / 2));
  background: rgba(251, 252, 251, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 212px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid #9bbdb0;
  border-radius: 6px;
  color: var(--green);
  font-weight: 800;
  letter-spacing: 0;
}

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

.brand strong {
  line-height: 1.15;
}

.brand small {
  color: var(--muted-ink);
  font-size: 12px;
}

.top-nav {
  display: flex;
  justify-content: center;
  flex: 1;
  gap: 26px;
  color: var(--muted-ink);
  font-size: 14px;
}

.site-actions {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  min-height: 38px;
  padding: 3px;
  border: 1px solid #c8d7d1;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.74);
}

.language-option {
  min-width: 46px;
  min-height: 30px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--muted-ink);
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
}

.language-option[aria-pressed="true"] {
  background: var(--ink);
  color: var(--white);
}

.header-cta {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 6px;
  color: var(--white);
  background: var(--blue);
  font-weight: 700;
  white-space: nowrap;
}

.header-cta:hover {
  color: var(--white);
  background: var(--blue-dark);
}

.section-band,
.section-block {
  position: relative;
}

.section-block {
  padding: 92px 0;
  background: var(--paper);
}

.section-band {
  background: var(--soft);
}

.section-band.muted {
  padding: 92px 0;
  background: #f2f6f4;
}

.hero {
  min-height: min(720px, calc(100svh - 120px));
  overflow: hidden;
  isolation: isolate;
  display: flex;
  align-items: center;
  padding: 74px 0 64px;
  background: #eef4f1;
}

.hero-product {
  position: absolute;
  right: max(8px, calc((100vw - var(--container)) / 2 - 48px));
  bottom: -34px;
  z-index: -1;
  width: min(52vw, 640px);
  max-height: 86%;
  object-fit: contain;
  filter: drop-shadow(0 30px 40px rgba(20, 44, 40, 0.18));
}

.hero-content {
  max-width: var(--container);
  padding-left: 28px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 690px;
  margin-bottom: 20px;
  font-size: 76px;
  line-height: 1.03;
  letter-spacing: 0;
}

.h1-line {
  display: block;
}

h2 {
  margin-bottom: 18px;
  font-size: 46px;
  line-height: 1.15;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

body.lang-en h1 {
  max-width: min(560px, 46vw);
  font-size: clamp(46px, 4.5vw, 58px);
}

body.lang-en .hero-lede {
  max-width: min(560px, 48vw);
  font-size: 19px;
}

body.lang-en .hero-product {
  right: max(8px, calc((100vw - var(--container)) / 2 - 8px));
  bottom: 28px;
  width: min(44vw, 600px);
}

body.lang-en .hero-actions,
body.lang-en .proof-strip,
body.lang-en .hero .fine-print {
  max-width: min(560px, 48vw);
}

body.lang-en .top-nav {
  gap: 22px;
}

body.lang-en .model-tab {
  min-width: 174px;
}

body.lang-en .model-spec-list dd {
  font-size: 16px;
}

.hero-lede {
  max-width: 560px;
  margin-bottom: 30px;
  color: #33423d;
  font-size: 22px;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 30px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
}

.button-primary {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 10px 22px rgba(23, 107, 135, 0.22);
}

.button-primary:hover {
  color: var(--white);
  background: var(--blue-dark);
}

.button-secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.76);
  border-color: #b8c9c2;
}

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

.proof-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 760px;
  margin-bottom: 14px;
}

.proof-strip span {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid #c9d8d2;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  color: #3b4944;
  font-size: 14px;
  white-space: nowrap;
}

.proof-strip strong {
  margin-right: 5px;
  color: var(--ink);
}

.fine-print {
  color: var(--muted-ink);
  font-size: 13px;
}

.nowrap {
  white-space: nowrap;
}

.metric-ribbon {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #172520;
  color: var(--white);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.metric-grid div {
  min-height: 116px;
  padding: 24px 28px;
  border-left: 1px solid rgba(255, 255, 255, 0.14);
}

.metric-grid div:last-child {
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

.metric-value,
.metric-label {
  display: block;
}

.metric-value {
  margin-bottom: 6px;
  color: #f6c16d;
  font-size: 30px;
  font-weight: 850;
  line-height: 1.1;
}

.metric-label {
  color: #d5dedb;
  font-size: 14px;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.82fr);
  gap: 72px;
  align-items: center;
}

.split-layout.reverse {
  grid-template-columns: minmax(360px, 0.88fr) minmax(0, 1fr);
}

.section-copy p {
  color: var(--muted-ink);
  font-size: 17px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 26px 0 18px;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: #263630;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.63em;
  width: 14px;
  height: 8px;
  border-left: 3px solid var(--green);
  border-bottom: 3px solid var(--green);
  transform: rotate(-45deg);
}

.calculator,
.lead-form {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}

.calculator {
  display: grid;
  gap: 18px;
  padding: 34px;
}

.calculator label,
.lead-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid #bccdc6;
  border-radius: 6px;
  background: #fbfdfc;
  color: var(--ink);
  outline: none;
}

input {
  min-height: 46px;
  padding: 0 12px;
}

textarea {
  min-height: 118px;
  padding: 12px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(23, 107, 135, 0.14);
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
}

.input-row span {
  color: var(--muted-ink);
  font-weight: 600;
  white-space: nowrap;
}

.calc-result {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px 16px;
  align-items: baseline;
  padding: 18px;
  border-radius: 6px;
  background: #edf6f2;
}

.calc-result span {
  color: var(--muted-ink);
  font-size: 14px;
}

.calc-result strong {
  color: var(--green);
  font-size: 30px;
  line-height: 1.1;
  text-align: right;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 42px;
}

.section-heading p {
  color: var(--muted-ink);
  font-size: 17px;
}

.model-browser {
  display: grid;
  gap: 18px;
}

.model-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.model-tab {
  display: inline-grid;
  min-width: 148px;
  min-height: 64px;
  align-content: center;
  gap: 3px;
  padding: 10px 14px;
  border: 1px solid #c8d7d1;
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
}

.model-tab:hover {
  border-color: var(--blue);
}

.model-tab[aria-pressed="true"] {
  border-color: var(--green);
  background: #e8f3ef;
  box-shadow: inset 0 0 0 1px rgba(38, 115, 90, 0.24);
}

.model-tab strong,
.model-tab span {
  display: block;
  white-space: nowrap;
}

.model-tab strong {
  font-size: 15px;
  line-height: 1.2;
}

.model-tab span {
  color: var(--muted-ink);
  font-size: 12px;
}

.model-stage {
  display: grid;
  grid-template-columns: minmax(0, 0.98fr) minmax(360px, 0.78fr);
  gap: 28px;
  align-items: stretch;
}

.model-media,
.model-details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}

.model-media {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.model-image-frame {
  display: grid;
  min-height: 360px;
  place-items: center;
  border-radius: 6px;
  background: #f8fbfa;
}

.model-image-frame img {
  width: 100%;
  max-height: 470px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}

.model-thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(72px, 86px));
  gap: 10px;
}

.model-thumb {
  display: grid;
  width: 86px;
  height: 72px;
  place-items: center;
  padding: 4px;
  border: 1px solid #c8d7d1;
  border-radius: 6px;
  background: #f8fbfa;
  cursor: pointer;
}

.model-thumb[aria-pressed="true"] {
  border-color: var(--green);
  box-shadow: inset 0 0 0 2px rgba(38, 115, 90, 0.26);
}

.model-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.model-details {
  display: grid;
  align-content: start;
  padding: 30px;
}

.model-kicker {
  margin-bottom: 8px;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
}

.model-details h3 {
  margin-bottom: 8px;
  font-size: 34px;
}

.model-details > p:not(.model-kicker) {
  color: var(--muted-ink);
  font-size: 16px;
}

.model-spec-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0 0;
}

.model-spec-list div {
  min-height: 82px;
  padding: 14px;
  border: 1px solid #d6e0dc;
  border-radius: 6px;
  background: #f8fbfa;
}

.model-spec-list dt {
  margin-bottom: 6px;
  color: var(--muted-ink);
  font-size: 13px;
}

.model-spec-list dd {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.25;
}

.card-grid {
  display: grid;
  gap: 16px;
}

.card-grid.five {
  grid-template-columns: repeat(5, 1fr);
}

.feature-card,
.industry-grid article {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.feature-card {
  display: grid;
  min-height: 360px;
  align-content: start;
  gap: 14px;
  padding: 22px;
}

.feature-visual {
  display: grid;
  height: 134px;
  place-items: center;
  padding: 0;
  border: 1px solid #dde7e2;
  border-radius: 6px;
  background: #f8fbfa;
  overflow: hidden;
}

.feature-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.feature-index {
  display: block;
  margin-bottom: 0;
  color: var(--amber);
  font-weight: 900;
}

.feature-card h3 {
  margin-bottom: 0;
}

.feature-card p,
.industry-grid p,
.comparison-list span {
  color: var(--muted-ink);
}

.material-section {
  padding-top: 0;
}

.image-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfa;
}

.image-panel img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}

.comparison-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.comparison-list div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.industry-grid article {
  min-height: 168px;
  padding: 24px;
}

.vision-section {
  background: var(--paper);
}

.vision-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.vision-card {
  display: grid;
  gap: 12px;
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fbfa;
  box-shadow: var(--shadow);
}

.vision-card video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 6px;
  background: #0e1714;
  object-fit: contain;
}

.vision-card span {
  color: var(--muted-ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.slogan-section {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  min-height: 520px;
  display: flex;
  align-items: center;
  background: #edf6f2;
}

.slogan-section::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: url("faq-bg.svg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.slogan-section::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(237, 246, 242, 0.48);
}

.slogan-content {
  position: relative;
  z-index: 1;
}

.slogan-content h2 {
  max-width: 720px;
  margin: 0;
  font-size: 78px;
  line-height: 1.08;
  letter-spacing: 0;
}

.contact-section {
  background: #172520;
  color: var(--white);
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.76fr);
  gap: 78px;
  align-items: center;
}

.contact-section .eyebrow {
  color: #9dd8c0;
}

.contact-copy {
  max-width: 620px;
}

.contact-copy h2 {
  color: var(--white);
}

.contact-section p {
  color: #d6dfdc;
  font-size: 17px;
}

.contact-placeholders {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.contact-placeholders span {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: #f4f9f7;
}

.lead-form {
  display: grid;
  gap: 16px;
  padding: 34px;
  color: var(--ink);
}

.lead-form.contact-form {
  display: flex;
  flex-direction: column;
  justify-self: end;
  width: min(100%, 760px);
  gap: 14px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 30px 78px rgba(5, 18, 17, 0.26);
}

.field-shell {
  position: relative;
}

.field-shell input {
  padding-right: 34px;
}

.required-star {
  position: absolute;
  top: 15px;
  right: 15px;
  color: #b42335;
  font-size: 18px;
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
}

.contact-form input,
.contact-form textarea {
  min-height: 52px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #f9fbfa;
  color: var(--ink);
  font-size: 15px;
}

.contact-form textarea {
  min-height: 140px;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(38, 115, 90, 0.52);
  box-shadow: 0 0 0 4px rgba(38, 115, 90, 0.11);
}

.contact-form .submit-btn {
  width: 100%;
  min-height: 52px;
  border: 0;
  border-radius: 7px;
  background: linear-gradient(135deg, #0f5068, #26735a);
  color: var(--white);
  font-size: 15px;
  font-weight: 780;
  box-shadow: 0 18px 42px rgba(15, 80, 104, 0.22);
}

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

.form-status {
  min-height: 22px;
  margin: 0;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
}

.site-footer {
  padding: 24px 0;
  background: #101a16;
  color: #dbe4e0;
}

.footer-layout {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: #c6d1cc;
  font-size: 14px;
}

@media (max-width: 1040px) {
  h1 {
    font-size: 58px;
  }

  h2 {
    font-size: 38px;
  }

  .top-nav {
    display: none;
  }

  .hero-content {
    max-width: 710px;
    padding-left: 0;
  }

  .card-grid.five {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .hero-product {
    width: min(54vw, 540px);
    opacity: 0.72;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .site-header {
    min-height: 66px;
    gap: 12px;
    padding: 10px 14px;
  }

  .brand {
    min-width: 0;
  }

  .brand small {
    display: none;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .site-actions {
    gap: 8px;
  }

  .language-switch {
    min-height: 34px;
    padding: 2px;
  }

  .language-option {
    min-width: 38px;
    min-height: 28px;
    font-size: 12px;
  }

  .header-cta {
    min-height: 38px;
    padding: 0 12px;
    font-size: 13px;
  }

  .hero {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-height: auto;
    padding: 48px 0 0;
    background: #eef4f1;
  }

  .hero-product {
    position: static;
    order: 2;
    width: min(100%, 520px);
    max-height: none;
    margin: 22px auto -10px;
    transform: none;
    opacity: 1;
  }

  .hero-content {
    order: 1;
  }

  h1 {
    font-size: 42px;
  }

  body.lang-en h1 {
    font-size: 38px;
  }

  body.lang-en .hero-lede {
    font-size: 16px;
  }

  .h1-line {
    display: inline;
  }

  h2 {
    font-size: 32px;
  }

  .hero-lede {
    font-size: 17px;
  }

  .hero-actions,
  .proof-strip {
    gap: 10px;
  }

  .button {
    width: 100%;
    min-height: 48px;
  }

  .proof-strip span {
    max-width: 100%;
    white-space: normal;
  }

  .section-block,
  .section-band.muted {
    padding: 68px 0;
  }

  .metric-grid,
  .split-layout,
  .split-layout.reverse,
  .contact-layout,
  .vision-grid,
  .industry-grid,
  .card-grid.five {
    grid-template-columns: 1fr;
  }

  .vision-card {
    padding: 12px;
  }

  .model-stage {
    grid-template-columns: 1fr;
  }

  .model-tab {
    min-width: 140px;
  }

  .model-image-frame {
    min-height: 260px;
  }

  .model-details {
    padding: 24px;
  }

  .model-details h3 {
    font-size: 28px;
  }

  .model-spec-list {
    grid-template-columns: 1fr;
  }

  .split-layout,
  .split-layout.reverse,
  .contact-layout {
    gap: 34px;
  }

  .calculator,
  .lead-form {
    padding: 24px;
  }

  .metric-grid div {
    min-height: 92px;
    border-right: 1px solid rgba(255, 255, 255, 0.14);
  }

  .feature-card {
    min-height: auto;
  }

  .feature-visual {
    height: 156px;
  }

  .comparison-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .calc-result {
    grid-template-columns: 1fr;
  }

  .calc-result strong {
    text-align: left;
  }

  .slogan-section {
    min-height: 380px;
  }

  .slogan-content h2 {
    font-size: 46px;
  }

  .footer-layout {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .brand strong {
    max-width: 112px;
    font-size: 14px;
    line-height: 1.2;
  }

  .site-header {
    gap: 8px;
  }

  .site-actions {
    gap: 6px;
  }

  .language-option {
    min-width: 34px;
    padding: 0 5px;
  }

  .header-cta {
    width: 112px;
    white-space: normal;
    line-height: 1.15;
  }

  h1 {
    font-size: 36px;
  }

  body.lang-en h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 28px;
  }

  .hero-product {
    width: 100%;
  }

  .slogan-content h2 {
    font-size: 40px;
  }
}