:root {
  color-scheme: dark;
  --page: #0a0a0b;
  --surface: #131314;
  --surface-raised: #19191a;
  --surface-hover: #222224;
  --ink: #f4f4f5;
  --body-copy: #cccccf;
  --muted: #a3a3a7;
  --line: rgba(255, 255, 255, 0.11);
  --line-strong: rgba(255, 255, 255, 0.18);
  --accent: #d7d7da;
  --accent-soft: rgba(255, 255, 255, 0.055);
  --header: rgba(10, 10, 11, 0.86);
  --section-tint: rgba(255, 255, 255, 0.018);
  --button-hover: #dedee0;
  --content-width: 1160px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.22);
}

:root[data-theme="light"] {
  color-scheme: light;
  --page: #f7f7f6;
  --surface: #ffffff;
  --surface-raised: #f1f1f0;
  --surface-hover: #e9e9e8;
  --ink: #1a1a1c;
  --body-copy: #505054;
  --muted: #68686c;
  --line: rgba(26, 26, 28, 0.13);
  --line-strong: rgba(26, 26, 28, 0.2);
  --accent: #3a3a3d;
  --accent-soft: rgba(26, 26, 28, 0.055);
  --header: rgba(247, 247, 246, 0.88);
  --section-tint: rgba(26, 26, 28, 0.022);
  --button-hover: #343437;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.11);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

button {
  font: inherit;
}

h1,
h2,
h3,
p,
figure,
dl,
dd {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  text-wrap: balance;
  word-break: keep-all;
}

p,
dd {
  text-wrap: pretty;
}

code,
kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.container {
  width: min(calc(100% - 48px), var(--content-width));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 8px 13px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--page);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: var(--header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 720;
  text-decoration: none;
  white-space: nowrap;
}

.brand img {
  width: 28px;
  height: 28px;
}

.brand small {
  margin-left: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 560;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
}

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

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

.theme-toggle {
  display: grid;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  place-items: center;
  touch-action: manipulation;
}

.theme-toggle:hover {
  background: var(--surface-hover);
}

.theme-toggle:active,
.button:active,
.skill-link:active {
  transform: translateY(1px);
}

.theme-toggle-symbol::before {
  content: "☀︎";
  font-size: 19px;
}

:root[data-theme="light"] .theme-toggle-symbol::before {
  content: "☾";
}

.screen {
  display: flex;
  min-height: calc(100svh - 64px);
  padding: clamp(52px, 7vh, 76px) 0;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin-bottom: 16px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: 0.08em;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--page);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.button:hover {
  border-color: var(--button-hover);
  background: var(--button-hover);
}

.hero-layout {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.95fr);
  gap: clamp(52px, 7vw, 92px);
}

.hero-copy {
  max-width: 650px;
}

.hero h1 {
  max-width: 720px;
  margin-bottom: 34px;
  font-size: clamp(3.5rem, 5vw, 4.65rem);
  font-weight: 630;
  letter-spacing: -0.025em;
  line-height: 1.08;
}

.hero .eyebrow {
  margin-bottom: 26px;
}

.hero-description {
  max-width: 620px;
  margin-bottom: 28px;
  color: var(--body-copy);
  font-size: clamp(1.05rem, 1.6vw, 1.18rem);
}

.limits-list code {
  color: var(--ink);
  font-size: 0.94em;
  font-weight: 680;
}

.hero-meta {
  display: flex;
  margin: 22px 0 0;
  padding: 0;
  flex-wrap: wrap;
  gap: 8px 20px;
  color: var(--muted);
  font-size: 12px;
  list-style: none;
}

.hero-meta li {
  position: relative;
  padding-left: 13px;
}

.hero-meta li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.hero-visual {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #f2f2f2;
  box-shadow: var(--shadow);
}

.hero-product-image {
  width: 100%;
  height: auto;
  aspect-ratio: 1788 / 880;
  object-fit: cover;
}

.scenarios-screen {
  background: var(--section-tint);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 36px;
}

.section-heading h2,
.limits-copy h2 {
  margin-bottom: 0;
  font-size: clamp(2.7rem, 5vw, 4.35rem);
  font-weight: 590;
  letter-spacing: -0.052em;
  line-height: 1.04;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.scenario-card {
  display: flex;
  padding: 32px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  flex-direction: column;
}

.scenario-card:first-child {
  background: linear-gradient(145deg, var(--surface-raised), var(--accent-soft));
}

.scenario-kicker {
  margin-bottom: 13px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 720;
}

.scenario-card h3 {
  margin-bottom: 13px;
  font-size: clamp(2rem, 3.4vw, 2.85rem);
  font-weight: 620;
  letter-spacing: -0.042em;
  line-height: 1.08;
}

.scenario-card:first-child h3 {
  margin-top: 34px;
}

.scenario-card > p:not(.scenario-kicker) {
  max-width: 520px;
  margin-bottom: 0;
  color: var(--body-copy);
}

.text-link {
  display: inline-flex;
  min-height: 44px;
  margin-top: auto;
  padding-top: 20px;
  align-items: center;
  gap: 7px;
  color: var(--accent);
  font-weight: 680;
  text-underline-offset: 4px;
}

.limits-screen {
  background: var(--page);
}

.limits-grid {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(0, 1.12fr) minmax(340px, 0.88fr);
  gap: clamp(48px, 7vw, 96px);
}

.limits-copy h2 {
  max-width: 710px;
  margin-bottom: 34px;
  overflow-wrap: anywhere;
  word-break: normal;
}

.limits-list {
  display: grid;
  margin-bottom: 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 32px;
}

.limits-list > div {
  padding: 18px 0 20px;
  border-top: 1px solid var(--line);
}

.limits-list dt {
  margin-bottom: 6px;
  font-size: 17px;
  font-weight: 680;
}

.limits-list dd {
  margin-left: 0;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.download-card {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(145deg, var(--surface), var(--accent-soft));
  box-shadow: var(--shadow);
  scroll-margin-top: 92px;
}

.recovery-note {
  display: grid;
  margin-bottom: 28px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line-strong);
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  align-items: end;
}

.recovery-note span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 680;
}

.recovery-note kbd {
  color: var(--ink);
  font-size: clamp(2.1rem, 4.4vw, 3.6rem);
  font-weight: 720;
  letter-spacing: -0.06em;
  line-height: 1;
  grid-column: 2;
  grid-row: 1 / span 2;
}

.recovery-note strong {
  font-size: 15px;
}

.download-card h3 {
  margin-bottom: 8px;
  font-size: 2.35rem;
  font-weight: 620;
  letter-spacing: -0.045em;
}

.download-card > p:not(.install-warning) {
  margin-bottom: 20px;
  color: var(--body-copy);
}

.download-card .button {
  width: 100%;
}

.install-warning {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.skill-link {
  display: inline-flex;
  min-height: 44px;
  margin-top: 12px;
  align-items: center;
  gap: 7px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 680;
  text-underline-offset: 4px;
}

.site-footer {
  padding: 26px 0 30px;
  color: var(--muted);
  font-size: 12px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-inner p {
  margin-bottom: 0;
}

.footer-inner strong,
.footer-inner span {
  display: block;
}

.footer-inner strong {
  color: var(--ink);
  font-size: 14px;
}

a:focus-visible,
[type="button"]:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

@media (max-width: 980px) {
  .hero-layout {
    grid-template-columns: minmax(0, 0.95fr) minmax(370px, 1.05fr);
    gap: 38px;
  }

  .hero h1 {
    font-size: clamp(3.25rem, 6.4vw, 4.4rem);
  }

  .scenario-card {
    padding: 28px;
  }

  .limits-grid {
    gap: 36px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .site-header {
    position: static;
  }

  .site-nav {
    gap: 14px;
  }

  .screen {
    min-height: auto;
    padding: 64px 0;
  }

  .hero-layout,
  .scenario-grid,
  .limits-grid {
    grid-template-columns: 1fr;
  }

  .hero-layout {
    gap: 48px;
  }

  .hero h1 {
    font-size: clamp(3rem, 11.5vw, 4.25rem);
  }

  .hero-visual {
    width: min(100%, 540px);
    margin-inline: auto;
  }

  .section-heading {
    margin-bottom: 30px;
  }

  .limits-copy h2 {
    margin-bottom: 28px;
  }

  .limits-grid {
    gap: 42px;
  }

  .download-card {
    width: min(100%, 520px);
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .brand span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .site-nav {
    gap: 12px;
  }

  .use-link {
    display: none;
  }

  .hero h1 {
    font-size: clamp(2.7rem, 12.6vw, 3.35rem);
  }

  .hero-description {
    font-size: 16px;
  }

  .button {
    width: 100%;
  }

  .hero-meta {
    gap: 6px 14px;
  }

  .hero-layout {
    gap: 36px;
  }

  .hero-visual {
    border-radius: 20px;
  }

  .section-heading h2,
  .limits-copy h2 {
    font-size: clamp(2.5rem, 11vw, 3.1rem);
  }

  .scenario-card {
    padding: 25px;
    border-radius: 20px;
  }

  .scenario-card h3 {
    font-size: 2.1rem;
  }

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

  .download-card {
    padding: 28px 24px;
    border-radius: 20px;
  }

  .recovery-note kbd {
    font-size: 2.45rem;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--page);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}