@font-face {
  font-family: 'Inter';
  src: url('https://cdn.zhoulingyu.net/fonts/inter/InterLatin.woff2') format('woff2');
}

@font-face {
  font-family: 'msr';
  src: url('https://cdn.zhoulingyu.net/fonts/~icon/msr.woff2') format('woff2');
}

:root {
  --color-base: #1a1a1a;
  --color-surface: #fafafa;
  --color-white: #ffffff;
  --color-text-dark: #171717;
  --color-text-light: #f3f3f3;
  --color-muted-dark: #8b8b8b;
  --color-muted-light: #676767;
  --color-border-dark: #2a2a2a;
  --color-border-light: #e6e6e6;
  --color-accent: #2f7ef7;
  --color-accent-2: #ff8c3a;
  --header-height: 4rem;
  --radius-xl: 1.25rem;
  --radius-lg: 1rem;
  --radius-md: 0.875rem;
  --shadow-soft: 0 16px 40px rgba(0, 0, 0, 0.08);
  --shadow-dark: 0 24px 48px rgba(0, 0, 0, 0.25);
  --container-width: 1140px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  background: var(--color-surface);
  color: var(--color-text-dark);
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.container {
  width: min(var(--container-width), calc(100% - 2.5rem));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(250, 250, 250, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(26, 26, 26, 0.08);
}

.nav-wrap {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
}

.logo {
  text-decoration: none;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
  flex-shrink: 0;
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.nav-github {
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.nav-github__badge {
  display: block;
  height: 20px;
  width: auto;
  max-width: min(92px, 28vw);
  object-fit: contain;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-base);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle:hover {
  background: rgba(26, 26, 26, 0.06);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.nav-toggle__bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-links {
  display: flex;
  flex: 1;
  gap: 0.5rem;
  flex-wrap: nowrap;
  justify-content: flex-end;
  align-items: center;
  min-width: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-muted-light);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  transition: color 180ms ease, background-color 180ms ease;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--color-base);
  background: rgba(26, 26, 26, 0.08);
}

body.nav-menu-open {
  overflow: hidden;
}

main {
  padding-top: var(--header-height);
}

section {
  position: relative;
  overflow: hidden;
}

.section-dark {
  background: var(--color-base);
  color: var(--color-text-light);
}

.section-light {
  background: var(--color-surface);
  color: var(--color-text-dark);
}

.hero {
  min-height: calc(94svh - var(--header-height));
  display: flex;
  align-items: center;
  padding: 5.5rem 0 4.5rem;
}

.hero-glow {
  position: absolute;
  top: -18%;
  right: -14%;
  width: min(56rem, 85vw);
  height: min(56rem, 85vw);
  border-radius: 50%;
  background:
    radial-gradient(
      circle at 32% 34%,
      rgba(47, 126, 247, 0.32),
      rgba(47, 126, 247, 0.05) 48%,
      rgba(47, 126, 247, 0) 72%
    ),
    radial-gradient(
      circle at 72% 70%,
      rgba(255, 140, 58, 0.24),
      rgba(255, 140, 58, 0) 65%
    );
  pointer-events: none;
  filter: blur(4px);
  transform: translate3d(0, 0, 0);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.pill {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0.32rem 0.72rem;
  border-radius: 999px;
  background: rgba(250, 250, 250, 0.08);
  border: 1px solid rgba(250, 250, 250, 0.15);
  font-size: 0.84rem;
}

.pill .material-symbols-outlined {
  font-size: 1rem;
  color: #9ec2ff;
}

.material-symbols-outlined{
font-family: 'msr' !important;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h1 {
  margin-top: 1rem;
  max-width: 14ch;
  font-size: clamp(2.2rem, 5.6vw, 5rem);
}

.hero-desc {
  margin-top: 1.15rem;
  max-width: 56ch;
  color: #cccccc;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  line-height: 1.7;
}

.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.76rem 1.18rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

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

.btn-primary {
  color: var(--color-white);
  background: var(--color-accent);
  box-shadow: 0 12px 22px rgba(47, 126, 247, 0.3);
}

.btn-primary:hover {
  background: #226ce0;
}

.btn-ghost {
  color: #f2f2f2;
  background: rgba(250, 250, 250, 0.08);
  border: 1px solid rgba(250, 250, 250, 0.2);
}

.kpis {
  margin-top: 2.4rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.kpis article {
  border: 1px solid rgba(250, 250, 250, 0.16);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  padding: 1rem;
}

.kpis h3 {
  font-size: 1.35rem;
}

.kpis p {
  margin: 0.4rem 0 0;
  color: #cacaca;
  font-size: 0.92rem;
}

.section-light .container,
.section-dark .container {
  padding: 5.4rem 0;
}

.section-label {
  margin: 0;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 700;
  opacity: 0.76;
}

.section-light h2,
.section-dark h2 {
  margin-top: 0.82rem;
  max-width: 18ch;
  font-size: clamp(1.75rem, 3.4vw, 3.2rem);
}

.feature-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 1.2rem 1.1rem;
  min-height: 12rem;
  box-shadow: var(--shadow-soft);
}

.feature-card .material-symbols-outlined {
  font-size: 1.35rem;
  color: var(--color-accent);
}

.feature-card h3 {
  margin-top: 0.6rem;
  font-size: 1rem;
}

.feature-card p {
  margin: 0.55rem 0 0;
  color: #4e4e4e;
  line-height: 1.55;
  font-size: 0.92rem;
}

.split-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.panel {
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.03);
}

.panel h3 {
  font-size: 1.08rem;
}

.panel ul {
  margin: 0.9rem 0 0;
  padding-left: 1.2rem;
  color: #cecece;
  line-height: 1.65;
}

.panel strong {
  color: var(--color-white);
}

.api-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.api-card {
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
}

.api-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.68rem;
}

.api-card p {
  margin: 0.52rem 0;
  color: #484848;
  line-height: 1.55;
  font-size: 0.92rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84em;
  border-radius: 0.35em;
  padding: 0.1em 0.38em;
  background: rgba(26, 26, 26, 0.08);
}

.section-dark code {
  background: rgba(250, 250, 250, 0.16);
}

.timeline {
  margin-top: 2rem;
  display: grid;
  gap: 0.8rem;
}

.timeline article {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: flex-start;
  gap: 0.9rem;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: 0.95rem 1rem;
  background: rgba(255, 255, 255, 0.03);
}

.timeline span {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-base);
  background: var(--color-white);
}

.timeline h3 {
  font-size: 1rem;
}

.timeline p {
  margin: 0.45rem 0 0;
  color: #cecece;
  line-height: 1.5;
}

.brand-wall {
  background: var(--color-white);
  padding: 4rem 0 2.2rem;
  border-top: 1px solid var(--color-border-light);
  overflow: clip;
}

.brand-wall .container {
  width: 100%;
  max-width: none;
  padding: 0 1rem;
  overflow: hidden;
}

.brand-fit {
  margin: 0;
  width: 100%;
  display: block;
  white-space: nowrap;
  line-height: 0.82;
  font-weight: 900;
  letter-spacing: -0.06em;
  color: var(--color-base);
  user-select: none;
  text-transform: uppercase;
}

.site-footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
  padding: 1.2rem 0 2rem;
}

.site-footer p {
  margin: 0;
  color: #666666;
  font-size: 0.9rem;
}

[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition: opacity 640ms ease, transform 640ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (max-width: 1080px) {
  .feature-grid,
  .api-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 800px) {
  :root {
    --header-height: 3.75rem;
  }

  .container {
    width: min(var(--container-width), calc(100% - 1.6rem));
  }

  .hero {
    padding: 4rem 0 3.4rem;
    min-height: auto;
  }

  .nav-wrap {
    padding: 0.5rem 0;
    flex-wrap: nowrap;
    align-items: center;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-github__badge {
    max-width: 76px;
    height: 18px;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 1001;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    flex-wrap: nowrap;
    gap: 0.15rem;
    margin: 0;
    padding: 0.65rem 1.25rem calc(0.85rem + env(safe-area-inset-bottom, 0px));
    background: rgba(250, 250, 250,1);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(26, 26, 26, 0.1);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
    max-height: min(70vh, calc(100dvh - var(--header-height)));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    white-space: normal;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
  }

  .kpis,
  .feature-grid,
  .split-grid,
  .api-grid {
    grid-template-columns: 1fr;
  }

  .section-light .container,
  .section-dark .container {
    padding: 4.4rem 0;
  }

  .brand-wall {
    padding-top: 3.2rem;
  }
}

@media (orientation: landscape) and (max-height: 660px) {
  .hero {
    min-height: auto;
    padding-top: 3.8rem;
  }

  .kpis article {
    padding: 0.8rem;
  }
}

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

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

  .btn {
    transition: none;
  }

  .hero-glow {
    transform: none !important;
  }

  .nav-toggle__bar {
    transition: none;
  }
}