:root {
  --ink: #0c2428;
  --ink-soft: #1a3d42;
  --mist: #e7eef0;
  --paper: #f3f7f7;
  --teal: #0e8f88;
  --teal-bright: #1fa6a0;
  --foam: #c7e8e3;
  --wash: #dce9e7;
  --line: rgba(12, 36, 40, 0.12);
  --shadow: 0 28px 60px rgba(12, 36, 40, 0.12);
  --font-brand: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(31, 166, 160, 0.16), transparent 55%),
    radial-gradient(900px 420px at 90% 8%, rgba(199, 232, 227, 0.7), transparent 50%),
    linear-gradient(180deg, #f7fbfb 0%, var(--paper) 40%, #eef4f4 100%);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
}

.skip:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--header-h);
  padding: 0.75rem clamp(1.25rem, 4vw, 3rem);
  background: rgba(243, 247, 247, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 247, 247, 0.92);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-mark__glyph {
  width: 1.55rem;
  height: 1.55rem;
  border: 2px solid var(--teal);
  border-radius: 50%;
  box-shadow: inset 0 0 0 4px var(--ink), 0 0 0 1px var(--foam);
  background: radial-gradient(circle at 35% 30%, var(--foam), var(--teal-bright));
}

.brand-mark__name {
  font-family: var(--font-brand);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
}

.site-nav {
  display: none;
  gap: 1.35rem;
  margin-left: auto;
  font-size: 0.95rem;
}

.site-nav a {
  text-decoration: none;
  opacity: 0.78;
}

.site-nav a:hover {
  opacity: 1;
}

.site-header .btn--sm {
  display: none;
}

.nav-toggle {
  margin-left: auto;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.nav-toggle span {
  width: 1rem;
  height: 1.5px;
  background: var(--ink);
}

.mobile-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 39;
  display: grid;
  gap: 0.25rem;
  padding: 0.75rem 1.25rem 1.25rem;
  background: rgba(243, 247, 247, 0.96);
  border-bottom: 1px solid var(--line);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  padding: 0.7rem 0.35rem;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
  color: inherit;
}

.btn--primary {
  background: var(--ink);
  color: var(--paper);
}

.btn--primary:hover {
  background: var(--ink-soft);
  color: var(--paper);
}

.btn--secondary {
  background: transparent;
  border-color: rgba(12, 36, 40, 0.28);
}

.btn--ghost {
  background: rgba(14, 143, 136, 0.1);
  color: var(--ink);
}

.btn--sm {
  min-height: 2.35rem;
  padding: 0.45rem 1rem;
  font-size: 0.92rem;
}

.hero {
  position: relative;
  min-height: calc(100svh - var(--header-h));
  display: grid;
  align-items: end;
  gap: 2rem;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1.25rem, 4vw, 3rem) clamp(2.5rem, 7vw, 4rem);
  overflow: clip;
}

.hero__atmosphere {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__wash {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  animation: drift 14s var(--ease) infinite alternate;
}

.hero__wash--a {
  width: min(70vw, 680px);
  height: min(70vw, 680px);
  top: -12%;
  right: -8%;
  background: radial-gradient(circle, rgba(31, 166, 160, 0.28), transparent 70%);
}

.hero__wash--b {
  width: min(55vw, 480px);
  height: min(55vw, 480px);
  left: -10%;
  bottom: 8%;
  background: radial-gradient(circle, rgba(199, 232, 227, 0.75), transparent 68%);
  animation-duration: 18s;
}

.hero__grain {
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image:
    linear-gradient(rgba(12, 36, 40, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(12, 36, 40, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 40%, black 20%, transparent 75%);
}

.hero__beam {
  position: absolute;
  inset: 8% 5% auto;
  height: 55%;
  background: linear-gradient(115deg, transparent 20%, rgba(244, 248, 247, 0.55) 48%, transparent 72%);
  transform: skewX(-18deg);
  animation: shimmer 9s ease-in-out infinite;
}

.hero__copy {
  position: relative;
  z-index: 1;
  max-width: 38rem;
}

.hero__brand,
.cta__brand {
  margin: 0 0 1rem;
  font-family: var(--font-brand);
  font-size: clamp(3.4rem, 12vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.hero__headline {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.35;
}

.hero__lede {
  margin: 1.15rem 0 0;
  max-width: 34rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.hero__visual {
  position: relative;
  z-index: 1;
  margin: 0;
  justify-self: end;
  width: min(100%, 420px);
}

.lens {
  width: 100%;
  filter: drop-shadow(var(--shadow));
}

.lens__orbit {
  transform-origin: 360px 360px;
  animation: spin 48s linear infinite;
}

.lens__orbit--slow {
  animation-duration: 72s;
  animation-direction: reverse;
}

.hero__caption {
  margin-top: 0.85rem;
  text-align: center;
  font-size: 0.88rem;
  letter-spacing: 0.12em;
  color: rgba(12, 36, 40, 0.62);
}

.section {
  padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 4vw, 3rem);
}

.section__inner {
  max-width: 1120px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}

.section h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.6vw, 2.55rem);
  line-height: 1.3;
}

.section__lede {
  margin: 1rem 0 0;
  max-width: 40rem;
  color: var(--ink-soft);
}

.promise {
  background: linear-gradient(180deg, transparent, rgba(220, 233, 231, 0.55));
}

.role-list {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.role-list li {
  display: grid;
  gap: 0.25rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
}

.role-list strong {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.flow {
  background:
    linear-gradient(180deg, rgba(12, 36, 40, 0.94), #0a1d20),
    var(--ink);
  color: var(--paper);
}

.flow .eyebrow {
  color: var(--foam);
}

.flow-track {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.flow-track li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.85rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(244, 248, 247, 0.12);
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.5vw, 1.45rem);
}

.flow-track span {
  color: var(--teal-bright);
  font-family: var(--font-body);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.flow-note {
  margin: 1.75rem 0 0;
  max-width: 38rem;
  color: rgba(244, 248, 247, 0.72);
}

.cap-rows {
  margin-top: 2.75rem;
  display: grid;
  gap: 0;
}

.cap-row {
  display: grid;
  gap: 0.55rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.cap-row:last-child {
  border-bottom: 1px solid var(--line);
}

.cap-row h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.cap-row p {
  margin: 0;
  max-width: 42rem;
  color: var(--ink-soft);
}

.scene-grid {
  margin-top: 2.5rem;
  display: grid;
  gap: 1.25rem;
}

.scene {
  position: relative;
  min-height: 18rem;
  padding: 1.75rem;
  overflow: hidden;
  color: var(--paper);
}

.scene::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
}

.scene--cafe::before {
  background:
    linear-gradient(160deg, rgba(12, 36, 40, 0.2), rgba(12, 36, 40, 0.78)),
    radial-gradient(circle at 20% 20%, rgba(199, 232, 227, 0.55), transparent 45%),
    linear-gradient(135deg, #1fa6a0, #0c2428 70%);
}

.scene--home::before {
  background:
    linear-gradient(160deg, rgba(12, 36, 40, 0.15), rgba(12, 36, 40, 0.8)),
    radial-gradient(circle at 80% 15%, rgba(244, 248, 247, 0.35), transparent 40%),
    linear-gradient(145deg, #2a5358, #0c2428 68%);
}

.scene > * {
  position: relative;
  z-index: 1;
}

.scene__label {
  margin: 0 0 1.5rem;
  letter-spacing: 0.16em;
  font-size: 0.8rem;
  color: var(--foam);
}

.scene h3 {
  margin: 0 0 0.85rem;
  font-family: var(--font-brand);
  font-size: clamp(2rem, 5vw, 2.8rem);
  letter-spacing: 0.04em;
}

.scene p:last-child {
  margin: 0;
  max-width: 28rem;
  color: rgba(244, 248, 247, 0.84);
}

.trust {
  background: linear-gradient(180deg, rgba(220, 233, 231, 0.45), transparent);
}

.trust__layout {
  display: grid;
  gap: 2rem;
}

.trust-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.trust-list li {
  padding-left: 1.35rem;
  position: relative;
}

.trust-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--teal);
}

.deploy-steps {
  margin-top: 2.5rem;
  display: grid;
  gap: 1.5rem;
}

.deploy-step {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 1rem;
  align-items: start;
}

.deploy-step > span {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.95rem;
}

.deploy-step h3 {
  margin: 0.15rem 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.deploy-step p {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
}

.deploy-step pre {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--ink);
  color: var(--foam);
  font-size: 0.9rem;
  line-height: 1.55;
}

.deploy-step code,
.deploy-note code,
.cta-hint code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.deploy-note {
  margin-top: 2rem;
  padding: 1.25rem 1.35rem;
  border-left: 3px solid var(--teal);
  background: rgba(14, 143, 136, 0.08);
}

.deploy-note strong {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-display);
}

.cta {
  padding-bottom: clamp(5rem, 12vw, 8rem);
}

.cta__panel {
  padding: clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(600px 280px at 85% 0%, rgba(31, 166, 160, 0.22), transparent 60%),
    linear-gradient(160deg, #eff6f5, #dce9e7);
  border: 1px solid rgba(14, 143, 136, 0.18);
}

.cta__panel h2 {
  margin-top: 0.35rem;
}

.cta__panel > p {
  margin: 0.9rem 0 0;
  color: var(--ink-soft);
}

.cta-form {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.75rem;
  max-width: 34rem;
}

.cta-form input {
  min-height: 3rem;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(12, 36, 40, 0.18);
  background: rgba(255, 255, 255, 0.72);
  font: inherit;
  color: var(--ink);
}

.cta-form input:focus {
  outline: 2px solid rgba(14, 143, 136, 0.45);
  outline-offset: 1px;
}

.cta-feedback {
  margin: 0.85rem 0 0;
  color: var(--teal-deep, #06665f);
}

.cta-hint {
  margin: 1rem 0 0;
  font-size: 0.92rem;
  color: rgba(12, 36, 40, 0.58);
}

.site-footer {
  padding: 2.5rem clamp(1.25rem, 4vw, 3rem) 3rem;
  border-top: 1px solid var(--line);
  background: rgba(220, 233, 231, 0.35);
}

.site-footer__inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}

.site-footer p {
  margin: 0.25rem 0 0;
  color: rgba(12, 36, 40, 0.65);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer__links a {
  text-decoration: none;
}

.site-footer__copy {
  font-size: 0.9rem;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

[data-reveal][data-delay="1"] {
  transition-delay: 0.08s;
}

[data-reveal][data-delay="2"] {
  transition-delay: 0.16s;
}

[data-reveal][data-delay="3"] {
  transition-delay: 0.24s;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__wash,
  .hero__beam,
  .lens__orbit {
    animation: none;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-24px, 18px, 0) scale(1.06);
  }
}

@keyframes shimmer {
  0%,
  100% {
    opacity: 0.35;
    transform: skewX(-18deg) translateX(-2%);
  }
  50% {
    opacity: 0.7;
    transform: skewX(-18deg) translateX(3%);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (min-width: 720px) {
  .site-nav {
    display: flex;
  }

  .site-header .btn--sm {
    display: inline-flex;
  }

  .nav-toggle,
  .mobile-nav {
    display: none !important;
  }

  .role-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .role-list li {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 1.25rem;
  }

  .role-list li:first-child {
    border-left: 0;
    padding-left: 0;
  }

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

  .scene-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .cta-form {
    grid-template-columns: 1fr auto;
  }

  .site-footer__inner {
    grid-template-columns: 1.4fr 1fr auto;
    align-items: end;
  }
}

@media (min-width: 980px) {
  .hero {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .hero__visual {
    width: min(100%, 520px);
  }

  .cap-row {
    grid-template-columns: 11rem 1fr;
    align-items: baseline;
    gap: 2rem;
  }

  .trust__layout {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: end;
  }

  .deploy-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .deploy-step {
    grid-template-columns: 1fr;
  }
}