:root {
  --ink: #101820;
  --muted: #5f6b73;
  --paper: #f7f6f1;
  --panel: #ffffff;
  --line: #d9e0df;
  --teal: #0c7c7b;
  --cyan: #28a8b8;
  --amber: #c48a2c;
  --green: #2d7a50;
  --dark: #071116;
  --shadow: 0 20px 70px rgba(16, 24, 32, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 4vw, 58px);
  color: #fff;
  background: rgba(7, 17, 22, 0.74);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 218px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: #fff;
  color: var(--dark);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.1;
}

.brand small {
  margin-top: 3px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 12px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px;
}

nav a {
  padding: 8px 11px;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
}

nav a:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.hero {
  position: relative;
  min-height: 92svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
  background: var(--dark);
  padding: 118px clamp(20px, 6vw, 84px) 76px;
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.82;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(5, 12, 16, 0.95), rgba(5, 12, 16, 0.76) 42%, rgba(5, 12, 16, 0.36) 76%),
    linear-gradient(0deg, rgba(7, 17, 22, 0.96), rgba(7, 17, 22, 0) 34%);
}

.hero-content {
  position: relative;
  width: min(720px, 100%);
}

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

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  max-width: 700px;
  font-size: clamp(44px, 7vw, 78px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(18px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 7px;
  font-weight: 800;
}

.primary-action {
  background: #fff;
  color: var(--dark);
}

.secondary-action {
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #fff;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 42px 0 0;
}

.hero-metrics div {
  padding: 15px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.hero-metrics dt {
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
}

.hero-metrics dd {
  margin: 3px 0 0;
  font-weight: 800;
}

.section {
  padding: 84px clamp(20px, 6vw, 84px);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 32px;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

.intro-grid,
.supplier-grid,
.pricing-grid,
.status-grid {
  display: grid;
  gap: 18px;
}

.intro-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.intro article,
.two-column > div,
.supplier-card,
.price-card,
.status-grid article,
.lesson-list article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(16, 24, 32, 0.05);
}

.intro article {
  padding: 24px;
}

.architecture {
  background: #e9f0ee;
}

.flow {
  display: grid;
  grid-template-columns: 1.1fr 32px 1.1fr 32px 1.1fr 32px 1.1fr 32px 1.1fr;
  align-items: center;
  margin: 0 0 28px;
}

.flow-node {
  min-height: 86px;
  display: grid;
  place-items: center;
  padding: 16px;
  border-radius: 8px;
  background: var(--dark);
  color: #fff;
  text-align: center;
  font-weight: 800;
}

.flow-node.accent {
  background: var(--teal);
}

.flow-line {
  height: 2px;
  background: var(--teal);
}

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

.two-column > div {
  padding: 24px;
}

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

.supplier-card {
  padding: 24px;
  min-height: 230px;
}

.supplier-card span,
.plan-label {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.supplier-card.live {
  border-top: 5px solid var(--green);
}

.supplier-card.standby {
  border-top: 5px solid var(--cyan);
}

.supplier-card.pending {
  border-top: 5px solid var(--amber);
}

.pricing {
  background: var(--dark);
  color: #fff;
}

.pricing .section-heading .eyebrow,
.pricing .plan-label {
  color: #f0b757;
}

.pricing-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.price-card {
  padding: 26px;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.16);
  color: rgba(255, 255, 255, 0.82);
}

.price-card h3,
.price-card .price {
  color: #fff;
}

.price-card.featured {
  background: #fff;
  color: var(--ink);
  transform: translateY(-10px);
  box-shadow: var(--shadow);
}

.price-card.featured h3,
.price-card.featured .price {
  color: var(--ink);
}

.price {
  margin: 0 0 14px;
  font-size: 42px;
  line-height: 1;
  font-weight: 800;
}

.payment-rail {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rail;
}

.payment-rail li {
  position: relative;
  min-height: 170px;
  padding: 22px 18px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
}

.payment-rail li::before {
  counter-increment: rail;
  content: counter(rail);
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  font-weight: 800;
}

.payment-rail strong,
.payment-rail span {
  display: block;
}

.payment-rail strong {
  margin-bottom: 8px;
}

.payment-rail span {
  color: var(--muted);
  font-size: 14px;
}

.lessons {
  background: #eef2ed;
}

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

.lesson-list article {
  padding: 22px;
}

.lesson-list strong {
  display: block;
  color: var(--teal);
  font-size: 32px;
  line-height: 1;
}

.status-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.status-grid article {
  padding: 24px;
}

ul {
  padding-left: 20px;
  margin: 0;
}

li + li {
  margin-top: 10px;
}

code {
  padding: 2px 6px;
  border-radius: 5px;
  background: #edf2f3;
  color: #0b5f68;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 6vw, 84px);
  color: rgba(255, 255, 255, 0.74);
  background: var(--dark);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #fff;
  font-weight: 800;
}

@media (max-width: 1080px) {
  .intro-grid,
  .supplier-grid,
  .pricing-grid,
  .status-grid,
  .lesson-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .payment-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .flow {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .flow-line {
    width: 2px;
    height: 18px;
    justify-self: center;
  }
}

@media (max-width: 760px) {
  .site-header {
    position: absolute;
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 18px;
  }

  .brand {
    min-width: 0;
  }

  nav {
    width: 100%;
    justify-content: flex-start;
  }

  .hero {
    min-height: 760px;
    align-items: flex-end;
    padding: 190px 18px 54px;
  }

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(5, 12, 16, 0.68), rgba(5, 12, 16, 0.92) 52%, rgba(5, 12, 16, 0.98)),
      linear-gradient(0deg, rgba(7, 17, 22, 0.96), rgba(7, 17, 22, 0) 30%);
  }

  .hero-metrics,
  .intro-grid,
  .supplier-grid,
  .pricing-grid,
  .payment-rail,
  .lesson-list,
  .status-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

  .price-card.featured {
    transform: none;
  }

  .section {
    padding: 62px 18px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}