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

:root {
  --ink: #0f1115;
  --ink-2: #2a2d34;
  --muted: #5a6170;
  --muted-2: #8a909c;
  --line: #e8ebf0;
  --line-soft: #f1f3f7;
  --paper: #ffffff;
  --paper-2: #f7f8fa;
  --accent: #1f74f9;
  --accent-deep: #0b55d1;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t: 260ms;
  --container: min(1200px, calc(100% - 64px));
  --radius: 12px;
  --radius-lg: 18px;
}

html {
  scroll-behavior: smooth;
  color-scheme: light;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Inter", "Helvetica Neue", Helvetica, Arial, "PingFang SC", "PingFang TC", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.005em;
}

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

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

button {
  font: inherit;
  cursor: pointer;
}

.section-inner {
  width: var(--container);
  margin: 0 auto;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 0 40px;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid transparent;
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.site-header[data-scroll="true"] {
  border-bottom-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}

.site-nav a {
  padding: 4px 0;
  transition: color var(--t) var(--ease);
}

.site-nav a:hover {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 16px;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  transition: background var(--t) var(--ease);
}

.nav-cta:hover {
  background: var(--ink-2);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.6);
  overflow: hidden;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.lang-switch a {
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding: 0 10px;
  color: var(--muted);
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}

.lang-switch a + a {
  border-left: 1px solid var(--line);
}

.lang-switch a:hover {
  color: var(--ink);
  background: rgba(0, 0, 0, 0.04);
}

.lang-switch a.active {
  background: var(--ink);
  color: #ffffff;
}

/* ---------- Hero ---------- */
.hero {
  padding: 104px 0 48px;
  background: var(--paper);
}

.hero-inner {
  width: var(--container);
  margin: 0 auto;
  max-width: 960px;
}

.hero-eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.hero-lede {
  margin: 24px 0 0;
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.65;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin: 40px 0 0;
  font-size: 15px;
  font-weight: 500;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.hero-links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.hero-links a span {
  transition: transform var(--t) var(--ease);
}

.hero-links a:hover span {
  transform: translateX(3px);
}

/* ---------- Section ---------- */
.section {
  padding: 96px 0;
  background: var(--paper);
}

.section-muted {
  background: var(--paper-2);
}

.section-heading {
  max-width: 820px;
  margin: 0 0 56px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--ink);
}

.section-heading p {
  margin: 18px 0 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

/* ---------- Overview (product preview image) ---------- */
.product-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: transparent;
}

.product-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.product-figure-lead {
  margin: 0 0 56px;
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.08);
}

.section-heading-centered {
  margin: 0 auto;
  text-align: center;
}

.section-heading-centered p {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Variants ---------- */
.variants-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.variant-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 32px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.variant-card:hover {
  border-color: #c9d0db;
  transform: translateY(-2px);
}

.variant-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.variant-tag {
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.variant-card h3 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.variant-card > p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.variant-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.55;
}

.variant-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.variant-list li::before {
  content: "";
  flex: none;
  width: 4px;
  height: 4px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--ink);
}

.variant-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  padding-top: 4px;
  transition: color var(--t) var(--ease);
}

.variant-link:hover {
  color: var(--accent);
}

.variant-link span {
  transition: transform var(--t) var(--ease);
}

.variant-link:hover span {
  transform: translateX(3px);
}

/* ---------- Feature rows ---------- */
.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 64px;
  align-items: center;
  padding: 40px 0;
}

.feature-row + .feature-row {
  margin-top: 24px;
}

.feature-row-reverse .feature-copy {
  order: 2;
}

.feature-row-reverse .feature-media {
  order: 1;
}

.feature-kicker {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.feature-copy h3 {
  margin: 0 0 16px;
  font-size: clamp(26px, 2.8vw, 34px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.feature-copy > p {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.feature-copy ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.55;
}

.feature-copy li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.feature-copy li::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--ink);
}

.feature-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper-2);
  aspect-ratio: 3200 / 1828;
}

.feature-media video,
.feature-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* ---------- Workflow ---------- */
.workflow-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
}

.workflow-step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 20px;
  align-items: flex-start;
  padding: 32px 24px 32px 0;
}

.workflow-step:nth-child(odd) {
  padding-right: 40px;
}

.workflow-step:nth-child(even) {
  padding-left: 40px;
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--ink);
  color: #ffffff;
  font-family: "SF Mono", "JetBrains Mono", ui-monospace, monospace;
  font-size: 13px;
  font-weight: 600;
}

.workflow-step h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.workflow-step p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

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

.download-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 36px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.download-card:hover {
  border-color: #c9d0db;
  transform: translateY(-2px);
}

.platform-label {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.download-card h3 {
  margin: 4px 0 0;
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.download-card > p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 10px;
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  margin-top: 8px;
  transition: color var(--t) var(--ease);
}

.download-link span {
  transition: transform var(--t) var(--ease);
}

.download-link:hover {
  color: var(--accent);
}

.download-link:hover span {
  transform: translateX(3px);
}

.download-link-muted {
  color: var(--muted);
  font-weight: 500;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background:
    linear-gradient(180deg, #ffffff 0%, #f4f8ff 45%, #d9e6ff 80%, #b8d0fb 100%);
  color: var(--ink);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(180px, 0.9fr) repeat(3, minmax(0, 1fr)) minmax(260px, 1.3fr);
  gap: 48px;
  padding: 72px 0 80px;
  align-items: flex-start;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
}

.footer-col h4 {
  margin: 0 0 16px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.footer-col a {
  color: var(--muted);
  font-size: 14px;
  transition: color var(--t) var(--ease);
}

.footer-col a:hover {
  color: var(--ink);
}

.footer-tagline {
  display: flex;
  flex-direction: column;
  gap: 24px;
  text-align: right;
}

.footer-tagline-text {
  margin: 0;
  color: var(--ink);
  font-size: clamp(20px, 1.6vw, 24px);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.02em;
}

.footer-bottom {
  padding: 22px 0;
  background: transparent;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 13px;
  color: var(--muted);
}

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-bottom-links a {
  color: var(--muted);
  transition: color var(--t) var(--ease);
}

.footer-bottom-links a:hover {
  color: var(--ink);
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  :root {
    --container: calc(100% - 48px);
  }

  .variants-grid {
    grid-template-columns: 1fr;
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 0;
  }

  .feature-row-reverse .feature-copy {
    order: 0;
  }

  .feature-row-reverse .feature-media {
    order: 0;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

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

  .workflow-step:nth-child(odd) {
    padding-right: 0;
    border-right: none;
  }

  .workflow-step:nth-child(even) {
    padding-left: 0;
  }

  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px 32px;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }

  .footer-tagline {
    grid-column: 1 / -1;
    text-align: left;
  }
}

@media (max-width: 720px) {
  :root {
    --container: calc(100% - 32px);
  }

  .site-header {
    padding: 0 20px;
    min-height: 56px;
    gap: 12px;
  }

  .site-nav {
    display: none;
  }

  .lang-switch {
    margin-left: auto;
  }

  .hero {
    padding: 72px 0 64px;
  }

  .hero-links {
    gap: 18px;
    font-size: 14px;
  }

  .section {
    padding: 64px 0;
  }

  .section-heading {
    margin-bottom: 36px;
  }

  .variant-card,
  .download-card {
    padding: 24px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    padding: 56px 0 64px;
    gap: 32px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .footer-bottom-links {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}