:root {
  --ink: #0f172a;
  --muted: #64748b;
  --line: #d7dde8;
  --paper: #f6f8fb;
  --white: #ffffff;
  --navy: #111827;
  --blue: #1262b3;
  --cyan: #0e8ba9;
  --red: #d72828;
  --gold: #c58b1a;
  --green: #098a57;
  --shadow: 0 22px 70px rgba(15, 23, 42, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  letter-spacing: 0;
  overflow-x: hidden;
}

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

button,
a {
  font: inherit;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: rgba(8, 15, 30, 0.86);
  color: #fff;
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  font-size: 19px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--red), #f3b431);
  box-shadow: 0 10px 30px rgba(215, 40, 40, 0.35);
}

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

.top-nav a {
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}

.top-nav a:hover {
  color: #fff;
}

.nav-cta {
  min-height: 34px;
  padding: 0 14px;
  border: 0;
  border-radius: 7px;
  background: var(--red);
  color: #fff;
  font-size: 14px;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(215, 40, 40, 0.28);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #08101f;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  opacity: 0.42;
  filter: saturate(0.92) contrast(1.06);
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 12, 25, 0.96) 0%, rgba(5, 12, 25, 0.78) 44%, rgba(5, 12, 25, 0.28) 100%),
    linear-gradient(0deg, rgba(246, 248, 251, 1) 0%, rgba(246, 248, 251, 0) 18%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding-top: 64px;
  color: #fff;
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: #f3b431;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(56px, 7vw, 104px);
  line-height: 0.98;
  font-weight: 900;
}

.subtitle {
  margin: 20px 0 0;
  font-size: clamp(26px, 3vw, 44px);
  font-weight: 800;
}

.hero-copy {
  max-width: 700px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 7px;
  text-decoration: none;
  font-weight: 900;
  border: 0;
  cursor: pointer;
}

.primary-action {
  background: var(--red);
  color: #fff;
  box-shadow: 0 14px 36px rgba(215, 40, 40, 0.35);
}

.secondary-action {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.08);
}

.metric-band {
  width: min(1180px, calc(100% - 48px));
  margin: -50px auto 0;
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.metric-band div {
  min-height: 112px;
  padding: 24px 28px;
  border-right: 1px solid var(--line);
}

.metric-band div:last-child {
  border-right: 0;
}

.metric-band strong {
  display: block;
  color: var(--red);
  font-size: 34px;
  line-height: 1;
  font-weight: 900;
}

.metric-band span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.top-contact-strip {
  width: min(1180px, calc(100% - 48px));
  margin: 28px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 5px solid var(--red);
  box-shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
}

.top-contact-strip strong {
  display: block;
  font-size: 22px;
  font-weight: 900;
}

.top-contact-strip span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-weight: 700;
}

.compact-action {
  min-width: 122px;
}

.section {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 96px 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(340px, 0.7fr);
  gap: 70px;
  align-items: end;
  margin-bottom: 34px;
}

.section h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.12;
  font-weight: 900;
}

.section h3 {
  margin: 18px 0 10px;
  font-size: 21px;
}

.section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
  font-size: 16px;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.proof-grid article,
.experience-grid article {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 26px;
  border-radius: 8px;
}

.proof-index {
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.showcase {
  display: grid;
  grid-template-columns: 0.55fr 1fr;
  gap: 34px;
  align-items: center;
  width: 100%;
  padding-left: max(24px, calc((100% - 1180px) / 2));
  padding-right: max(24px, calc((100% - 1180px) / 2));
  background: #111827;
  color: #fff;
}

.showcase p {
  color: rgba(255, 255, 255, 0.75);
}

.check-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 13px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  color: rgba(255, 255, 255, 0.88);
  font-weight: 700;
}

.screenshot-frame {
  padding: 0;
  border: 0;
  background: transparent;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: zoom-in;
}

.screenshot-frame img {
  width: 100%;
  aspect-ratio: 1500 / 980;
  object-fit: cover;
  background: #e8edf4;
}

.module-filter {
  position: sticky;
  top: 68px;
  z-index: 8;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 14px 0;
  margin-bottom: 20px;
  background: rgba(246, 248, 251, 0.9);
  backdrop-filter: blur(12px);
}

.filter-btn {
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  border-radius: 7px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 900;
  white-space: nowrap;
  cursor: pointer;
}

.filter-btn.active {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.module-card {
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.07);
}

.module-card.hidden {
  display: none;
}

.module-shot {
  border: 0;
  padding: 0;
  background: #e8edf4;
  cursor: zoom-in;
}

.module-shot img {
  width: 100%;
  aspect-ratio: 1500 / 980;
  object-fit: cover;
}

.module-body {
  padding: 24px;
}

.module-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.module-tag {
  color: var(--red);
  font-size: 13px;
  font-weight: 900;
}

.module-body h3 {
  margin: 0;
  font-size: 24px;
}

.module-body p {
  margin-top: 12px;
  min-height: 88px;
}

.module-points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 18px;
}

.module-points span,
.ai-points span {
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 8px 10px;
  border-radius: 6px;
  background: #f1f5f9;
  color: #334155;
  font-size: 13px;
  font-weight: 800;
}

.ai-section {
  width: 100%;
  padding-left: max(24px, calc((100% - 1180px) / 2));
  padding-right: max(24px, calc((100% - 1180px) / 2));
  background: #fff;
}

.ai-layout {
  display: grid;
  grid-template-columns: 0.62fr 1fr;
  gap: 42px;
  align-items: center;
}

.ai-points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 28px;
}

.ai-shot {
  border: 1px solid var(--line);
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.final-cta {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto 82px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 44px;
  background: linear-gradient(135deg, #111827, #1b2a45);
  color: #fff;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.final-cta h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.18;
}

.final-cta p {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.76);
}

.site-footer {
  min-height: 142px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 max(24px, calc((100% - 1180px) / 2));
  background: #080f1e;
  color: #fff;
}

.site-footer div {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer span {
  color: rgba(255, 255, 255, 0.65);
}

.site-footer a {
  color: #fff;
  text-decoration: none;
  font-weight: 900;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 28px;
  background: rgba(3, 7, 18, 0.86);
}

.lightbox.open {
  display: flex;
}

.lightbox-close {
  position: absolute;
  top: 22px;
  right: 28px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 30px;
  cursor: pointer;
}

.lightbox-panel {
  width: min(1420px, 100%);
}

.lightbox-panel p {
  margin: 0 0 12px;
  color: #fff;
  font-weight: 900;
}

.lightbox-panel img {
  width: 100%;
  max-height: 86vh;
  object-fit: contain;
  background: #fff;
  border-radius: 8px;
}

.contact-modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(3, 7, 18, 0.78);
  backdrop-filter: blur(10px);
}

.contact-modal.open {
  display: flex;
}

.contact-card {
  position: relative;
  width: min(420px, 100%);
  padding: 34px;
  border-radius: 8px;
  background: #fff;
  text-align: center;
  box-shadow: var(--shadow);
}

.contact-card .section-kicker {
  margin-bottom: 8px;
}

.contact-card h2 {
  margin: 0 0 22px;
  font-size: 34px;
  line-height: 1.15;
}

.contact-card img {
  width: min(260px, 82vw);
  margin: 0 auto;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.contact-note {
  margin: 20px 0 0;
  color: var(--muted);
  line-height: 1.75;
  font-weight: 700;
}

.contact-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  font-size: 24px;
  cursor: pointer;
}

@media (max-width: 980px) {
  .site-header {
    height: auto;
    min-height: 64px;
    padding: 12px 20px;
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .top-nav {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero {
    min-height: 86vh;
  }

  .metric-band,
  .top-contact-strip,
  .proof-grid,
  .module-grid,
  .experience-grid,
  .showcase,
  .ai-layout,
  .section-head,
  .final-cta {
    grid-template-columns: 1fr;
  }

  .top-contact-strip {
    align-items: flex-start;
    flex-direction: column;
  }

  .metric-band div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .metric-band div:last-child {
    border-bottom: 0;
  }

  .module-filter {
    top: 102px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 28px;
    padding-bottom: 28px;
  }
}

@media (max-width: 620px) {
  .hero-inner,
  .section,
  .metric-band {
    width: min(100% - 28px, 1180px);
  }

  .hero h1 {
    font-size: 42px;
  }

  .subtitle {
    font-size: 24px;
  }

  .hero-copy {
    font-size: 16px;
    max-width: 100%;
  }

  .hero-actions a {
    flex: 1 1 145px;
    padding: 0 14px;
  }

  .hero-actions .primary-action,
  .hero-actions .secondary-action {
    flex: 1 1 145px;
    padding: 0 14px;
  }

  .module-points,
  .ai-points {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }
}