/* /assets/site.css */
/* ============ 1. Reset & Tokens ============ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* color */
  --c-deep: #0A192F;
  --c-ink: #0D1117;
  --c-neon: #39FF14;
  --c-purple: #BF00FF;
  --c-paper: #F5E6C8;
  --c-slate: #8892B0;
  --c-frost: #CCF8FF;
  --c-deep-soft: rgba(10, 25, 47, 0.8);

  /* fonts */
  --font-display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "HarmonicOS Sans", "Helvetica Neue", "Noto Sans SC", "Microsoft YaHei", sans-serif;

  /* type scale */
  --fs-display: clamp(2.5rem, 6vw, 4.5rem);
  --fs-h1: clamp(2rem, 4.5vw, 3rem);
  --fs-h2: clamp(1.6rem, 3vw, 2.25rem);
  --fs-h3: clamp(1.15rem, 1.8vw, 1.5rem);
  --fs-body: 1rem;
  --fs-caption: 0.8rem;

  /* space */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;

  /* layout */
  --container: 1320px;
  --radius: 3px;

  /* lines */
  --line: rgba(136, 146, 176, 0.18);
  --line-neon: rgba(57, 255, 20, 0.45);
  --line-purple: rgba(191, 0, 255, 0.4);

  /* gradients */
  --grad-progress: linear-gradient(90deg, var(--c-neon), var(--c-purple));
  --grad-ocean: linear-gradient(180deg, var(--c-deep) 0%, var(--c-ink) 130%);
}

/* ============ 2. Base ============ */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-slate);
  background-color: var(--c-deep);
  background-image:
    linear-gradient(rgba(136, 146, 176, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(136, 146, 176, 0.055) 1px, transparent 1px);
  background-size: 32px 32px;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  color: var(--c-frost);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

a {
  color: var(--c-frost);
  transition: color 0.2s ease;
}

a:hover {
  color: var(--c-neon);
}

p {
  margin-block: 0;
}

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

::selection {
  background: var(--c-neon);
  color: #041010;
}

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

/* ============ 3. Skip Link & Progress ============ */
.leyu-jump {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%, -150%);
  z-index: 1200;
  padding: 0.6rem 1.4rem;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  background: var(--c-neon);
  color: #041010;
  border-radius: 0 0 4px 4px;
  transition: transform 0.2s ease;
}

.leyu-jump:focus {
  transform: translate(-50%, 0);
}

.leyu-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--grad-progress);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.5);
  z-index: 1000;
  pointer-events: none;
}

/* ============ 4. Header ============ */
.leyu-header {
  position: sticky;
  top: 0;
  z-index: 800;
  background: rgba(10, 25, 47, 0.88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(57, 255, 20, 0.14);
}

.leyu-header-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2.2rem);
  min-height: 76px;
}

/* Brand logo */
.leyu-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--c-frost);
  margin-right: auto;
  flex-shrink: 0;
}

.leyu-logo:hover {
  color: var(--c-frost);
}

.leyu-logo--mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.05em;
  color: #041010;
  background: linear-gradient(135deg, var(--c-neon), var(--c-purple));
  transform: skew(-8deg);
  border-radius: 2px;
}

.leyu-logo--text {
  display: block;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1;
  transform: skew(-3deg);
}

.leyu-logo--accent {
  display: block;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  font-weight: 600;
  color: var(--c-neon);
  text-transform: uppercase;
  margin-top: 0.12rem;
}

/* Navigation */
.leyu-nav {
  margin-left: auto;
}

.leyu-nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.leyu-nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  padding: 0.45rem 0.6rem;
  color: var(--c-slate);
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.025em;
  text-transform: uppercase;
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

.leyu-nav-link::after {
  content: "";
  position: absolute;
  left: 0.6rem;
  right: 0.6rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--grad-progress);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s ease;
}

.leyu-nav-link:hover,
.leyu-nav-link[aria-current="page"] {
  color: var(--c-frost);
}

.leyu-nav-link:hover::after,
.leyu-nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.leyu-nav-index {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--c-purple);
  letter-spacing: 0.05em;
}

.leyu-nav-link:hover .leyu-nav-index,
.leyu-nav-link[aria-current="page"] .leyu-nav-index {
  color: var(--c-neon);
}

/* Toggle button */
.leyu-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(136, 146, 176, 0.35);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.leyu-nav-toggle:hover {
  border-color: var(--c-neon);
  background: rgba(57, 255, 20, 0.06);
}

.leyu-nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-frost);
  transition: transform 0.22s ease, opacity 0.2s ease;
}

.leyu-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.leyu-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.leyu-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* CTA */
.leyu-cta {
  flex-shrink: 0;
}

/* ============ 5. Footer ============ */
.leyu-footer {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(10, 25, 47, 0.4) 0%, var(--c-ink) 45%),
    var(--c-ink);
  border-top: 1px solid rgba(191, 0, 255, 0.25);
  margin-top: auto;
}

.leyu-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-purple) 35%, transparent 85%);
}

.leyu-footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 3rem clamp(1rem, 4vw, 2.5rem) 1.5rem;
}

.leyu-footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: 2.25rem;
}

.leyu-footer-brand .leyu-logo {
  margin-bottom: 1rem;
}

.leyu-footer-desc {
  max-width: 38ch;
  font-size: 0.9rem;
  color: var(--c-slate);
  margin-bottom: 1rem;
}

.leyu-footer-trust {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--c-neon);
  opacity: 0.85;
  border-left: 2px solid rgba(57, 255, 20, 0.4);
  padding-left: 0.8rem;
}

.leyu-footer-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.leyu-footer-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-frost);
  margin-bottom: 0.8rem;
}

.leyu-footer-col ul {
  list-style: none;
}

.leyu-footer-col li + li {
  margin-top: 0.42rem;
}

.leyu-footer-col a,
.leyu-footer-bottom a {
  color: var(--c-slate);
  text-decoration: none;
  transition: color 0.2s ease;
}

.leyu-footer-col a:hover,
.leyu-footer-bottom a:hover {
  color: var(--c-neon);
}

.leyu-footer-contact {
  font-size: 0.9rem;
  line-height: 1.85;
}

.leyu-footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--c-slate);
  border-top: 1px solid rgba(136, 146, 176, 0.14);
  padding-top: 1.2rem;
}

/* ============ 6. Buttons ============ */
.leyu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  background: var(--c-neon);
  color: #041010;
  transform: skew(-3deg);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.leyu-btn:hover {
  background: var(--c-purple);
  color: #FFFFFF;
  box-shadow: 0 0 24px rgba(191, 0, 255, 0.35);
}

.leyu-btn--outline {
  background: transparent;
  border-color: rgba(57, 255, 20, 0.55);
  color: var(--c-neon);
}

.leyu-btn--outline:hover {
  background: rgba(57, 255, 20, 0.08);
  border-color: var(--c-neon);
  color: var(--c-neon);
  box-shadow: 0 0 16px rgba(57, 255, 20, 0.18);
}

/* ============ 7. Layout Components ============ */
.leyu-container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.leyu-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 1.8rem);
}

.leyu-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding-block: clamp(2.5rem, 7vw, 5rem);
}

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

.leyu-hero-visual {
  min-height: 340px;
  border: 1px solid rgba(57, 255, 20, 0.25);
  background:
    radial-gradient(circle at 24% 28%, rgba(191, 0, 255, 0.3), transparent 58%),
    radial-gradient(circle at 78% 72%, rgba(57, 255, 20, 0.2), transparent 50%),
    linear-gradient(135deg, rgba(57, 255, 20, 0.08), rgba(191, 0, 255, 0.1));
  display: grid;
  place-items: center;
}

.leyu-magazine {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(200px, 28%);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.leyu-section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.leyu-section-head {
  margin-bottom: 2rem;
}

.leyu-section-kicker {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.leyu-section-title {
  font-size: var(--fs-h2);
  color: var(--c-frost);
  transform: skew(-4deg);
  margin-top: 0.4rem;
}

/* ============ 8. Cards & Panels ============ */
.leyu-card {
  position: relative;
  display: block;
  padding: 1.6rem;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.leyu-card:hover {
  transform: rotate(-0.5deg) translateY(-4px);
  border-color: var(--line-neon);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
}

.leyu-card-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-frost);
  margin-bottom: 0.55rem;
  line-height: 1.15;
}

.leyu-card-meta {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.leyu-panel {
  padding: 1.6rem;
  border: 1px solid rgba(10, 25, 47, 0.2);
  background: var(--c-paper);
  color: var(--c-ink);
}

.leyu-panel .leyu-card-title {
  color: var(--c-deep);
}

.leyu-side-note {
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--c-slate);
  border-left: 2px solid var(--c-purple);
  padding-left: 1rem;
}

/* ============ 9. Tags & Badges ============ */
.leyu-code-tag {
  display: inline-block;
  padding: 0.16rem 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--c-frost);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.3);
  border-radius: 2px;
}

.leyu-badge {
  display: inline-block;
  padding: 0.28rem 0.7rem;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-frost);
  background: rgba(191, 0, 255, 0.12);
  border: 1px solid var(--line-purple);
  transform: skew(-4deg);
  border-radius: 2px;
}

/* ============ 10. Breadcrumb & Prose ============ */
.leyu-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.8rem;
  align-items: center;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--c-slate);
  margin-bottom: 1.5rem;
}

.leyu-breadcrumb a {
  color: var(--c-slate);
  text-decoration: none;
  transition: color 0.2s ease;
}

.leyu-breadcrumb a:hover {
  color: var(--c-neon);
}

.leyu-breadcrumb [aria-current="page"] {
  color: var(--c-frost);
}

.leyu-prose {
  max-width: 72ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-slate);
}

.leyu-prose p {
  margin-block: 0.9em;
}

.leyu-prose h1,
.leyu-prose h2,
.leyu-prose h3 {
  color: var(--c-frost);
  margin-block: 1.4em 0.5em;
  transform: skew(-2deg);
}

.leyu-prose strong {
  color: var(--c-frost);
  font-weight: 600;
}

.leyu-prose ul {
  margin-block: 1em;
  padding-left: 1.2em;
}

.leyu-prose li {
  margin-block: 0.35em;
}

.leyu-prose code,
.leyu-prose kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: rgba(57, 255, 20, 0.08);
  padding: 0.1em 0.4em;
  border-radius: 2px;
}

.leyu-prose blockquote {
  margin-block: 1.2em;
  padding: 0.8em 1.2em;
  border-left: 3px solid var(--c-purple);
  background: rgba(191, 0, 255, 0.06);
  color: var(--c-frost);
}

/* ============ 11. Media Container ============ */
.leyu-media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, rgba(57, 255, 20, 0.08), rgba(191, 0, 255, 0.1));
  border: 1px solid var(--line);
}

.leyu-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.leyu-media--16x9 {
  aspect-ratio: 16 / 9;
}

.leyu-media--4x3 {
  aspect-ratio: 4 / 3;
}

.leyu-media--square {
  aspect-ratio: 1;
}

/* ============ 12. Scroll Reveal ============ */
.leyu-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.leyu-reveal--active {
  opacity: 1;
  transform: none;
}

/* ============ 13. Responsive ============ */
@media (max-width: 1024px) {
  .leyu-nav-toggle {
    display: inline-flex;
  }

  .leyu-cta {
    display: none;
  }

  .leyu-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: rgba(10, 25, 47, 0.98);
    border-bottom: 1px solid rgba(57, 255, 20, 0.25);
    box-shadow: 0 22px 40px rgba(0, 0, 0, 0.45);
    padding: 0.5rem clamp(1rem, 4vw, 2.5rem) 1.25rem;
  }

  .leyu-nav[data-open] {
    display: block;
  }

  .leyu-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.3rem;
  }

  .leyu-nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 0.25rem;
    border-bottom: 1px solid rgba(136, 146, 176, 0.12);
  }

  .leyu-nav-link::after {
    display: none;
  }
}

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

  .leyu-magazine {
    grid-template-columns: 1fr;
  }

  .leyu-footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .leyu-footer-columns {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 640px) {
  .leyu-footer-columns {
    grid-template-columns: 1fr;
  }

  .leyu-footer-bottom {
    flex-direction: column;
  }

  .leyu-hero-visual {
    min-height: 240px;
  }
}

/* ============ 14. Reduced Motion ============ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .leyu-reveal {
    opacity: 1;
    transform: none;
  }
}