:root {
  color-scheme: light;
  --canvas: #F5F7FA;
  --card: #FFFFFF;
  --card-alt: #F0F3F8;
  --border: #DCE3EC;
  --accent: #0891B2;
  --accent-contrast: #FFFFFF;
  --success: #059669;
  --warning: #D97706;
  --danger: #DC2626;
  --text: #0F172A;
  --muted: #64748B;
  --brand: #2563EB;
  --brand-2: #22D3EE;
  --brand-gradient: linear-gradient(120deg, #2563EB 0%, #22D3EE 100%);
  --brand-gradient-text: linear-gradient(110deg, #2563EB 10%, #0891B2 90%);
  --shadow-card: 0 16px 40px rgba(15, 23, 42, 0.07);
  --shadow-window: 0 28px 70px rgba(15, 23, 42, 0.2);
  --header-bg: rgba(245, 247, 250, 0.86);
  --font-sans: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-mono: Consolas, 'Cascadia Mono', 'Courier New', monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #0B0F14;
  --card: #151C26;
  --card-alt: #1B2431;
  --border: #233044;
  --accent: #22D3EE;
  --accent-contrast: #062129;
  --success: #34D399;
  --warning: #FBBF24;
  --danger: #F87171;
  --text: #E6EDF3;
  --muted: #8A97A8;
  --brand: #2563EB;
  --brand-2: #22D3EE;
  --brand-gradient: linear-gradient(120deg, #2563EB 0%, #22D3EE 100%);
  --brand-gradient-text: linear-gradient(110deg, #22D3EE 10%, #2563EB 90%);
  --shadow-card: 0 16px 40px rgba(0, 0, 0, 0.42);
  --shadow-window: 0 28px 70px rgba(0, 0, 0, 0.55);
  --header-bg: rgba(11, 15, 20, 0.82);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

::selection {
  background: color-mix(in srgb, var(--accent) 30%, transparent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  text-decoration: none;
  font-size: 13px;
}

.skip-link:focus {
  left: 16px;
  top: 12px;
}

.wrap {
  width: min(1120px, 100% - clamp(28px, 6vw, 48px));
  margin: 0 auto;
}

/* ------------------------------------------------------------------ header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 62px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  order: 1;
  text-decoration: none;
  color: var(--text);
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: block;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 15px;
  letter-spacing: 0.01em;
}

.brand-text span {
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.site-nav {
  order: 2;
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.site-nav a {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.site-nav a:hover {
  color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 55%, transparent);
}

.theme-toggle {
  order: 3;
  margin-left: 0;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease, background-color 0.16s ease;
}

.theme-toggle:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  color: var(--accent);
}

.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

@media (min-width: 861px) {
  .theme-toggle {
    margin-left: 4px;
  }
}

/* -------------------------------------------------------------------- hero */

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 6vw, 78px) 0 clamp(52px, 6vw, 88px);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto;
  height: 120%;
  background:
    radial-gradient(46% 42% at 78% 30%, color-mix(in srgb, var(--brand-2) 20%, transparent), transparent 72%),
    radial-gradient(40% 36% at 12% 8%, color-mix(in srgb, var(--brand) 12%, transparent), transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: clamp(30px, 4.5vw, 60px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.hero h1 {
  margin: 20px 0 16px;
  font-size: clamp(34px, 4.8vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  font-weight: 700;
}

.grad-text {
  background: var(--brand-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  margin: 0 0 28px;
  max-width: 30em;
  color: var(--muted);
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.75;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease;
}

.btn-lg {
  padding: 13px 24px;
  font-size: 15px;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 26%, transparent);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px color-mix(in srgb, var(--accent) 32%, transparent);
}

.btn-ghost {
  background: var(--card);
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  color: var(--accent);
}

.hero-meta {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.01em;
}

.hero-facts {
  display: flex;
  gap: clamp(20px, 3vw, 34px);
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-facts strong {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-facts span {
  font-size: 12px;
  color: var(--muted);
}

.hero-art {
  position: relative;
  isolation: isolate;
  margin: 0;
}

.hero-art::before {
  content: "";
  position: absolute;
  inset: -9% -7% -12%;
  background: radial-gradient(58% 54% at 68% 38%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 72%);
  filter: blur(28px);
  z-index: -1;
  pointer-events: none;
}

.app-window {
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow-window), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.app-window img {
  display: block;
  width: 100%;
  height: auto;
}

.hero-art figcaption {
  margin-top: 12px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

/* ----------------------------------------------------------------- sections */

.section {
  padding: clamp(56px, 7vw, 88px) 0;
  scroll-margin-top: 80px;
}

.section-alt {
  background: var(--card-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 730px;
  margin-bottom: clamp(26px, 3.4vw, 38px);
}

.section-head h2 {
  margin: 14px 0 10px;
  font-size: clamp(25px, 3vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

/* ----------------------------------------------------------------- features */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.feature:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow-card);
}

.feature-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--accent);
  background: var(--card-alt);
  background: color-mix(in srgb, var(--accent) 14%, var(--card));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}

.tone-warning .feature-icon {
  color: var(--warning);
  background: color-mix(in srgb, var(--warning) 14%, var(--card));
  border-color: color-mix(in srgb, var(--warning) 24%, transparent);
}

.tone-success .feature-icon {
  color: var(--success);
  background: color-mix(in srgb, var(--success) 14%, var(--card));
  border-color: color-mix(in srgb, var(--success) 24%, transparent);
}

.tone-danger .feature-icon {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 13%, var(--card));
  border-color: color-mix(in srgb, var(--danger) 24%, transparent);
}

.feature h3 {
  margin: 2px 0 0;
  font-size: 16.5px;
  letter-spacing: -0.01em;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 13.8px;
  line-height: 1.72;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
  padding-top: 12px;
}

.tags span {
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card-alt);
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.5;
}

/* -------------------------------------------------------------- screenshots */

.shot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.shot {
  position: relative;
  display: block;
  padding: 0;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: zoom-in;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.shot:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow-card);
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 0.28s ease;
}

.shot:hover img {
  transform: scale(1.02);
}

.shot-label {
  position: absolute;
  left: 10px;
  bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(6, 12, 20, 0.72);
  color: #FFFFFF;
  font-size: 11.5px;
  letter-spacing: 0.02em;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

/* ----------------------------------------------------------------- download */

.download-card {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: clamp(22px, 3vw, 34px);
  padding: clamp(22px, 3vw, 34px);
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow-card);
}

.download-main h3 {
  margin: 12px 0 6px;
  font-size: 23px;
  letter-spacing: -0.015em;
}

.download-sub {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 13.5px;
}

.fine {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.download-meta {
  padding-left: clamp(20px, 3vw, 30px);
  border-left: 1px solid var(--border);
}

.download-meta h4 {
  margin: 0 0 10px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.download-meta h4:not(:first-child) {
  margin-top: 22px;
}

.sha-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.sha-row code {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-alt);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.55;
  word-break: break-all;
}

.copy-btn {
  flex: none;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.copy-btn:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  color: var(--accent);
}

.req-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.req-list li {
  position: relative;
  padding-left: 14px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.req-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--success);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.step {
  padding: 20px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
}

.step-num {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 10px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 14%, var(--card));
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.step h4 {
  margin: 0 0 4px;
  font-size: 14.5px;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

/* ---------------------------------------------------------------- changelog */

.changelog {
  display: grid;
  gap: 18px;
}

.release {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 22px;
  padding: 22px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card);
}

.release-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.release-meta time {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.release-body h3 {
  margin: 0 0 9px;
  font-size: 16px;
}

.release-body ul {
  margin: 0;
  padding-left: 18px;
}

.release-body li {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.75;
}

.release-body li + li {
  margin-top: 4px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card-alt);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
}

.pill-accent {
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  color: var(--accent);
}

.pill-success {
  background: color-mix(in srgb, var(--success) 13%, transparent);
  border-color: color-mix(in srgb, var(--success) 30%, transparent);
  color: var(--success);
}

/* ------------------------------------------------------------------- footer */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--canvas);
  padding: 26px 0;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  color: var(--muted);
  font-size: 12.5px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-brand img {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  display: block;
}

.footer-inner p {
  margin: 0;
}

/* ----------------------------------------------------------------- lightbox */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 44px);
  background: rgba(4, 9, 16, 0.84);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.lightbox[hidden] {
  display: none;
}

.lightbox-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin: 0;
  max-width: 100%;
}

.lightbox-figure img {
  width: auto;
  max-width: min(1180px, 92vw);
  max-height: 82vh;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.5);
  background: #0B0F14;
}

.lightbox-figure figcaption {
  color: #E6EDF3;
  font-size: 13px;
  text-align: center;
}

.lightbox-close {
  position: fixed;
  top: 18px;
  right: 18px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  cursor: pointer;
  transition: background-color 0.16s ease;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

body.lightbox-open {
  overflow: hidden;
}

/* ----------------------------------------------------------------- responsive */

@media (max-width: 980px) {
  .feature-grid,
  .shot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .download-meta {
    padding-left: 0;
    padding-top: 22px;
    border-left: 0;
    border-top: 1px solid var(--border);
  }
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-art {
    max-width: 620px;
  }

  .hero-copy {
    max-width: 640px;
  }
}

@media (max-width: 860px) {
  .header-inner {
    justify-content: space-between;
    padding: 10px 0;
    gap: 10px 16px;
  }

  .theme-toggle {
    order: 2;
    margin-left: auto;
  }

  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    gap: 20px;
    padding: 2px 0 4px;
  }
}

@media (max-width: 720px) {
  .release {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .release-meta {
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

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

@media (max-width: 620px) {
  .feature-grid,
  .shot-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-facts {
    gap: 22px;
  }

  .download-main .btn {
    width: 100%;
  }

  .section-head p {
    font-size: 14px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}