/* ================================================
   蜉蝣一粟 - Global Design System
   Pixel-Art Game Company Theme — Tech Blue Edition
   ================================================ */

/* ---- CSS Variables ---- */
:root {
  --bg-deep: #050d1a;
  --bg-dark: #071428;
  --bg-panel: #0a1a30;
  --bg-card: #0d2040;

  --neon-blue: #00c8ff;
  --neon-dim: #0099cc;
  --accent: #3d8bff;
  --accent-dim: #2a60c0;
  --cyan: #00ffee;
  --amber: #ffb800;
  --amber-dim: #cc9200;
  --pixel-white: #d8eeff;
  --pixel-gray: #6a8aaa;
  --pixel-red: #ff4466;

  /* Tech blue shadows */
  --shadow-blue: 0 0 12px var(--neon-blue), 0 0 35px rgba(0, 200, 255, 0.3);
  --shadow-cyan: 0 0 10px var(--cyan), 0 0 28px rgba(0, 255, 238, 0.3);
  --shadow-amber: 0 0 10px var(--amber), 0 0 30px rgba(255, 184, 0, 0.3);

  --font-pixel: 'Courier New', Courier, ui-monospace, monospace;
  --font-body: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;

  --transition: 0.15s steps(4, end);
  --nav-h: 70px;
}

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  image-rendering: pixelated;
}

body {
  background-color: var(--bg-deep);
  color: var(--pixel-white);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.75;
  overflow-x: hidden;
}

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

a {
  color: var(--neon-blue);
  text-decoration: none;
}

a:hover {
  color: var(--cyan);
}

ul {
  list-style: none;
}

/* ---- Scanline overlay ---- */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(0deg,
      rgba(0, 0, 0, 0.06) 0px,
      rgba(0, 0, 0, 0.06) 1px,
      transparent 1px,
      transparent 3px);
  pointer-events: none;
  z-index: 9999;
}

/* ================================================
   NAVIGATION
   ================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(5, 13, 26, 0.95);
  border-bottom: 3px solid var(--neon-blue);
  box-shadow: 0 3px 0 var(--bg-dark), var(--shadow-blue);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 1000;
  backdrop-filter: blur(8px);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.nav-brand-logo {
  width: 40px;
  height: 40px;
  image-rendering: pixelated;
  border: 2px solid var(--neon-blue);
  box-shadow: var(--shadow-blue);
}

.nav-brand-name {
  font-family: var(--font-pixel);
  font-size: 0.85rem;
  color: var(--neon-blue);
  text-shadow: var(--shadow-blue);
  letter-spacing: 0.05em;
  line-height: 1.4;
}

.nav-brand-tagline {
  font-family: var(--font-pixel);
  font-size: 0.8rem;
  color: var(--pixel-gray);
  display: block;
  letter-spacing: 0.04em;
  margin-top: 0.2rem;
  line-height: 1.4;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.nav-links a {
  font-family: var(--font-pixel);
  font-size: 1.0rem;
  color: var(--pixel-white);
  padding: 0.4rem 0.75rem;
  border: 2px solid transparent;
  transition: var(--transition);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--neon-blue);
  border-color: var(--neon-blue);
  box-shadow: var(--shadow-blue);
  text-shadow: 0 0 8px var(--neon-blue);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 28px;
  height: 3px;
  background: var(--neon-blue);
  transition: var(--transition);
  box-shadow: 0 0 6px var(--neon-blue);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: rgba(5, 13, 26, 0.98);
  border-bottom: 3px solid var(--neon-blue);
  flex-direction: column;
  padding: 1rem 0;
  z-index: 999;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  font-family: var(--font-pixel);
  font-size: 0.7rem;
  color: var(--pixel-white);
  padding: 0.9rem 2rem;
  border-left: 3px solid transparent;
  letter-spacing: 0.05em;
  transition: var(--transition);
}

.nav-mobile a:hover,
.nav-mobile a.active {
  color: var(--neon-blue);
  border-left-color: var(--neon-blue);
  background: rgba(0, 200, 255, 0.05);
}

/* ================================================
   PIXEL UTILITIES
   ================================================ */
.pixel-box {
  border: 3px solid var(--neon-blue);
  box-shadow:
    3px 3px 0 var(--neon-dim),
    6px 6px 0 rgba(0, 200, 255, 0.12);
  background: var(--bg-card);
}

.pixel-box-amber {
  border: 3px solid var(--amber);
  box-shadow:
    3px 3px 0 var(--amber-dim),
    6px 6px 0 rgba(255, 184, 0, 0.12);
  background: var(--bg-card);
}

/* Pixel button */
.btn-pixel {
  display: inline-block;
  font-family: var(--font-pixel);
  font-size: 0.75rem;
  padding: 0.9rem 1.7rem;
  background: var(--bg-deep);
  color: var(--neon-blue);
  border: 3px solid var(--neon-blue);
  box-shadow: 4px 4px 0 var(--neon-dim);
  cursor: pointer;
  letter-spacing: 0.08em;
  line-height: 1;
  transition: var(--transition);
  position: relative;
  user-select: none;
}

.btn-pixel:hover {
  background: var(--neon-blue);
  color: var(--bg-deep);
  box-shadow: 2px 2px 0 var(--neon-dim), var(--shadow-blue);
  transform: translate(2px, 2px);
}

.btn-pixel:active {
  box-shadow: none;
  transform: translate(4px, 4px);
}

.btn-amber {
  color: var(--amber);
  border-color: var(--amber);
  box-shadow: 4px 4px 0 var(--amber-dim);
}

.btn-amber:hover {
  background: var(--amber);
  color: var(--bg-deep);
  box-shadow: 2px 2px 0 var(--amber-dim), var(--shadow-amber);
}

/* Section styles */
.section {
  padding: 5rem 2rem;
  position: relative;
}

.section-title {
  font-family: var(--font-pixel);
  font-size: clamp(0.9rem, 2.5vw, 1.3rem);
  color: var(--amber);
  text-shadow: var(--shadow-amber);
  margin-bottom: 0.75rem;
  letter-spacing: 0.1em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--pixel-gray);
  margin-bottom: 3rem;
  max-width: 600px;
}

/* Pixel divider */
.pixel-divider {
  height: 4px;
  background: repeating-linear-gradient(90deg,
      var(--neon-blue) 0px, var(--neon-blue) 8px,
      transparent 8px, transparent 16px);
  margin: 1rem 0 3rem;
  width: 120px;
  box-shadow: 0 0 8px var(--neon-blue);
}

.pixel-divider.amber {
  background: repeating-linear-gradient(90deg,
      var(--amber) 0px, var(--amber) 8px,
      transparent 8px, transparent 16px);
  box-shadow: 0 0 8px var(--amber);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Grid helpers */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* ================================================
   ANIMATIONS
   ================================================ */
@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

@keyframes neonPulse {

  0%,
  100% {
    text-shadow: 0 0 8px var(--neon-blue), 0 0 20px rgba(0, 200, 255, 0.4);
  }

  50% {
    text-shadow: 0 0 18px var(--neon-blue), 0 0 55px rgba(0, 200, 255, 0.7);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll-reveal base state */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================
   FOOTER
   ================================================ */
.footer {
  background: var(--bg-panel);
  border-top: 3px solid var(--neon-blue);
  box-shadow: 0 -3px 0 rgba(0, 200, 255, 0.2);
  padding: 3rem 2rem 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand h3 {
  font-family: var(--font-pixel);
  font-size: 0.85rem;
  color: var(--neon-blue);
  margin-bottom: 1rem;
  text-shadow: var(--shadow-blue);
}

.footer-brand p {
  font-size: 1rem;
  color: var(--pixel-gray);
  line-height: 1.8;
}

.footer-col h4 {
  font-family: var(--font-pixel);
  font-size: 0.65rem;
  color: var(--amber);
  margin-bottom: 1rem;
  letter-spacing: 0.08em;
}

.footer-col ul li {
  margin-bottom: 0.5rem;
}

.footer-col ul li a {
  font-size: 1rem;
  color: var(--pixel-gray);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--neon-blue);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 2px solid rgba(0, 200, 255, 0.2);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  font-family: var(--font-pixel);
  font-size: 0.8rem;
  color: var(--pixel-gray);
  letter-spacing: 0.05em;
}

.footer-bottom a {
  color: var(--pixel-gray);
  font-size: 0.8rem;
  font-family: var(--font-pixel);
}

.footer-icp {
  text-align: center;
  padding-top: 1rem;
  margin-top: 1rem;
  border-top: 1px solid rgba(0, 200, 255, 0.1);
}

.footer-icp a {
  font-family: var(--font-pixel);
  font-size: 0.8rem;
  color: var(--pixel-gray);
  text-decoration: none;
}

.footer-icp a:hover {
  color: var(--neon-blue);
}

.footer-bottom a:hover {
  color: var(--neon-blue);
}

/* Pixel cursor blink */
.cursor-blink::after {
  content: '▌';
  animation: blink 1s step-end infinite;
  color: var(--neon-blue);
}

/* Tag badges */
.tag {
  display: inline-block;
  font-family: var(--font-pixel);
  font-size: 0.8rem;
  padding: 0.1rem 0.6rem;
  border: 2px solid var(--neon-blue);
  color: var(--neon-blue);
  letter-spacing: 0.05em;
  margin: 0.2rem;
}

.tag.amber {
  border-color: var(--amber);
  color: var(--amber);
}

/* Page hero common */
.page-hero {
  padding: 8rem 2rem 4rem;
  background: var(--bg-dark);
  border-bottom: 3px solid var(--neon-blue);
  text-align: center;
}

.page-hero h1 {
  font-family: var(--font-pixel);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--neon-blue);
  text-shadow: var(--shadow-blue);
  margin-bottom: 1rem;
  animation: neonPulse 3s ease-in-out infinite;
}

.page-hero p {
  color: var(--pixel-gray);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ================================================
   RESPONSIVE BREAKPOINTS
   ================================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .section {
    padding: 4rem 1.25rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .page-hero {
    padding: 7rem 1.25rem 3rem;
  }
}

@media (max-width: 480px) {
  :root {
    --nav-h: 60px;
  }

  .nav-brand-name {
    font-size: 0.65rem;
  }

  .btn-pixel {
    font-size: 0.6rem;
    padding: 0.8rem 1.3rem;
  }

  .section-title {
    font-size: 0.9rem;
  }

  body {
    font-size: 17px;
  }
}