:root {
  color-scheme: light;
  --page: #f4f7fb;
  --surface: #ffffff;
  --surface-subtle: #edf2f8;
  --ink: #101828;
  --ink-muted: #344054;
  --ink-soft: #667085;
  --line: rgb(22 46 84 / 12%);
  --line-strong: rgb(22 46 84 / 19%);
  --primary: #2455f4;
  --primary-strong: #1745d1;
  --primary-wash: rgb(36 85 244 / 10%);
  --success: #17825d;
  --shadow: 0 28px 80px rgb(14 32 62 / 18%);
  --font-ui:
    -apple-system, blinkmacsystemfont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #080c12;
  --surface: #111822;
  --surface-subtle: #0d141e;
  --ink: #f4f7fb;
  --ink-muted: #d4dbe7;
  --ink-soft: #a4afbf;
  --line: rgb(218 231 255 / 10%);
  --line-strong: rgb(218 231 255 / 18%);
  --primary: #4f8df7;
  --primary-strong: #79aafc;
  --primary-wash: rgb(79 141 247 / 15%);
  --success: #63d5a8;
  --shadow: 0 34px 100px rgb(0 0 0 / 58%);
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}
html {
  min-width: 320px;
  scroll-behavior: smooth;
}
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  font-family: var(--font-ui);
  background: var(--page);
}
a {
  color: inherit;
}
img {
  display: block;
  max-width: 100%;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: #fff;
  background: var(--primary);
  transform: translateY(-160%);
}
.skip-link:focus {
  transform: translateY(0);
}
.site-header {
  position: absolute;
  z-index: 20;
  top: 0;
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 48px), 1400px);
  height: 78px;
  transform: translateX(-50%);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}
.brand img {
  width: 34px;
  height: 42px;
  object-fit: contain;
}
.brand span {
  display: grid;
  gap: 2px;
}
.brand strong {
  font-size: 15px;
}
.brand small {
  color: var(--ink-soft);
  font-size: 10px;
}
.site-header nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-link,
.site-footer a,
.text-link {
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 44px;
  text-decoration: none;
}
.nav-link:hover,
.site-footer a:hover,
.text-link:hover {
  color: var(--primary);
}
.theme-toggle {
  display: grid;
  width: 44px;
  height: 44px;
  padding: 0;
  place-items: center;
  color: var(--ink-muted);
  font-size: 19px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}
.theme-toggle:hover {
  color: var(--primary);
  border-color: var(--primary);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 19px;
  gap: 9px;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  background: var(--primary);
  border: 1px solid transparent;
  border-radius: 8px;
  box-shadow: 0 10px 24px rgb(36 85 244 / 24%);
  transition:
    background-color 160ms ease,
    transform 120ms ease,
    box-shadow 180ms ease;
}
.button:hover {
  background: var(--primary-strong);
  box-shadow: 0 13px 30px rgb(36 85 244 / 30%);
  transform: translateY(-1px);
}
.button:active {
  transform: scale(0.98);
}
.button-small {
  min-height: 42px;
  padding-inline: 15px;
}
.button-large {
  min-height: 52px;
  padding-inline: 23px;
  font-size: 15px;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(380px, 0.88fr) minmax(560px, 1.12fr);
  align-items: center;
  min-height: min(800px, 92svh);
  padding: 108px max(32px, calc((100vw - 1400px) / 2)) 58px;
  gap: 48px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero::after {
  position: absolute;
  z-index: -1;
  top: 0;
  right: 0;
  width: 54%;
  height: 100%;
  content: "";
  opacity: 0.42;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(90deg, transparent, #000 35%);
}
.hero-copy {
  position: relative;
  z-index: 3;
}
.kicker,
.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 750;
  text-transform: uppercase;
}
.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
}
.kicker span {
  width: 28px;
  height: 2px;
  background: var(--primary);
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1 {
  margin-bottom: 20px;
  font-size: 58px;
  line-height: 1.12;
}
.hero-lead {
  max-width: 590px;
  margin-bottom: 29px;
  color: var(--ink-muted);
  font-size: 18px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  align-items: center;
  margin-bottom: 40px;
  gap: 12px;
}
.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  max-width: 620px;
  margin: 0;
  gap: 18px;
}
.hero-proof div {
  padding-left: 13px;
  border-left: 2px solid var(--line-strong);
}
.hero-proof dt {
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 750;
}
.hero-proof dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.5;
}
.hero-scene {
  position: relative;
  min-height: 590px;
  transform: perspective(1800px) rotateY(-4deg);
  transform-origin: center right;
}
.cover {
  position: absolute;
  z-index: 2;
  bottom: 30px;
  left: 2%;
  width: 185px;
  height: 262px;
  margin: 0;
  filter: drop-shadow(0 28px 38px rgb(4 9 24 / 32%));
  transform: rotate(-5deg);
}
.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}
.cover-back {
  z-index: 1;
  bottom: 88px;
  left: 18%;
  transform: rotate(8deg);
}
.editor-preview {
  position: absolute;
  z-index: 3;
  top: 44px;
  right: 0;
  width: min(88%, 720px);
  min-height: 500px;
  overflow: hidden;
  background: color-mix(in srgb, var(--surface) 91%, transparent);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(140%);
}
.editor-preview > header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 52px;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
}
.editor-preview > header > span {
  display: flex;
  gap: 6px;
}
.editor-preview > header i {
  width: 7px;
  height: 7px;
  background: var(--line-strong);
  border-radius: 50%;
}
.editor-preview > header strong {
  font-size: 12px;
}
.manuscript {
  max-width: 510px;
  padding: 52px 48px 130px;
  margin: 0 auto;
  font-family: "Songti SC", STSong, serif;
  font-size: 17px;
  line-height: 2;
}
.editor-preview > aside {
  position: absolute;
  right: 18px;
  bottom: 18px;
  display: grid;
  width: 300px;
  padding: 14px;
  gap: 8px;
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--primary) 25%, var(--line));
  border-radius: 8px;
  box-shadow: 0 12px 30px rgb(14 32 62 / 12%);
}
.editor-preview > aside span {
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
}
.editor-preview > aside strong {
  font-size: 12px;
  line-height: 1.6;
}

.content-band,
.workflow-band,
.faq-band,
.closing-band,
.site-footer {
  width: min(calc(100% - 48px), 1320px);
  margin: 0 auto;
}
.content-band {
  padding: 86px 0 92px;
}
.section-heading {
  max-width: 720px;
  margin-bottom: 42px;
}
.section-heading h2,
.workflow-band h2,
.closing-band h2 {
  margin-bottom: 14px;
  font-size: 34px;
  line-height: 1.28;
}
.section-heading > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
}
.capability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.capability-grid article {
  min-height: 240px;
  padding: 30px 26px;
  border-left: 1px solid var(--line);
}
.capability-grid article:first-child {
  border-left: 0;
}
.capability-grid article > span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}
.capability-grid h3 {
  margin: 48px 0 12px;
  font-size: 18px;
}
.capability-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.75;
}
.workflow-band {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(560px, 1.2fr);
  padding: 80px 0;
  gap: 72px;
  border-top: 1px solid var(--line);
}
.workflow-band ol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 0;
  margin: 0;
  list-style: none;
}
.workflow-band li {
  display: grid;
  grid-template-columns: 36px 1fr;
  min-height: 130px;
  padding: 20px;
  gap: 12px;
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
}
.workflow-band li:nth-child(-n + 2) {
  border-top: 0;
}
.workflow-band li > span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}
.workflow-band strong {
  display: block;
  margin-bottom: 8px;
}
.workflow-band p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.7;
}
.faq-band {
  padding: 84px 0 92px;
  border-top: 1px solid var(--line);
}
.faq-list {
  max-width: 900px;
}
.faq-list details {
  border-bottom: 1px solid var(--line);
}
.faq-list summary {
  min-height: 64px;
  padding: 20px 4px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}
.faq-list details p {
  max-width: 760px;
  padding: 0 4px 22px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.8;
}
.closing-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 70px 0;
  gap: 30px;
  border-top: 1px solid var(--line);
}
.closing-band h2 {
  margin: 0;
}
.site-footer {
  padding: 24px 0;
  color: var(--ink-soft);
  font-size: 12px;
  border-top: 1px solid var(--line);
}
.site-footer-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-footer a {
  font-size: 12px;
}
.site-footer .site-filing {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 16px auto 0;
  padding: 6px 0;
  text-align: center;
  overflow-wrap: anywhere;
}

@media (max-width: 1050px) {
  .hero {
    grid-template-columns: minmax(340px, 0.9fr) minmax(460px, 1.1fr);
  }
  .hero-scene {
    min-height: 520px;
  }
  .editor-preview {
    width: 94%;
    min-height: 450px;
  }
  .capability-grid {
    grid-template-columns: 1fr 1fr;
  }
  .capability-grid article:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .capability-grid article:nth-child(4) {
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 780px) {
  .site-header {
    width: calc(100% - 32px);
    height: 70px;
  }
  .brand small,
  .nav-link,
  .button-small {
    display: none;
  }
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 104px 20px 48px;
    gap: 18px;
  }
  .hero::after {
    width: 100%;
    opacity: 0.25;
    mask-image: linear-gradient(180deg, transparent, #000);
  }
  h1 {
    font-size: 42px;
  }
  .hero-lead {
    font-size: 16px;
  }
  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }
  .text-link {
    text-align: center;
  }
  .hero-proof {
    gap: 10px;
  }
  .hero-proof div {
    padding-left: 9px;
  }
  .hero-scene {
    min-height: 340px;
    transform: none;
  }
  .editor-preview {
    top: 18px;
    width: 88%;
    min-height: 300px;
  }
  .editor-preview > header {
    height: 42px;
  }
  .manuscript {
    padding: 28px 24px 90px;
    font-size: 13px;
  }
  .editor-preview > aside {
    right: 10px;
    bottom: 10px;
    width: 220px;
    padding: 10px;
  }
  .cover {
    bottom: 0;
    width: 100px;
    height: 142px;
  }
  .cover-back {
    display: none;
  }
  .content-band,
  .workflow-band,
  .faq-band,
  .closing-band,
  .site-footer {
    width: calc(100% - 40px);
  }
  .content-band,
  .faq-band {
    padding: 64px 0;
  }
  .section-heading h2,
  .workflow-band h2,
  .closing-band h2 {
    font-size: 28px;
  }
  .workflow-band {
    grid-template-columns: 1fr;
    padding: 64px 0;
    gap: 28px;
  }
  .closing-band {
    align-items: stretch;
    flex-direction: column;
  }
  .site-footer {
    padding: 28px 0;
  }
  .site-footer-main {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 520px) {
  .brand strong {
    font-size: 14px;
  }
  .hero-proof {
    grid-template-columns: 1fr;
  }
  .hero-proof div {
    min-height: 52px;
  }
  .capability-grid {
    grid-template-columns: 1fr;
  }
  .capability-grid article {
    min-height: 210px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .capability-grid article:first-child {
    border-top: 0;
  }
  .workflow-band ol {
    grid-template-columns: 1fr;
  }
  .workflow-band li,
  .workflow-band li:nth-child(2) {
    border-top: 1px solid var(--line);
  }
  .workflow-band li:first-child {
    border-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 1ms !important;
  }
}