/* NicaiEmu site — dark amber/teal glassmorphism theme. */

:root {
  --bg: #0d1117;
  --bg-alt: #111a26;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-border: rgba(255, 255, 255, 0.09);
  --text: #e6edf3;
  --muted: #8b98a5;
  --amber: #f0a35e;
  --teal: #4fd1c5;
  --accent: var(--amber);
  --radius: 18px;
  --max: 1080px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(240, 163, 94, 0.12), transparent 60%),
    radial-gradient(800px 420px at -10% 30%, rgba(79, 209, 197, 0.10), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ====== NAV ====== */

nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(13, 17, 23, 0.72);
  border-bottom: 1px solid var(--panel-border);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: auto;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.lang-toggle {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  cursor: pointer;
  font-size: 0.85rem;
}

.nav-github {
  color: var(--amber) !important;
  font-weight: 600;
}

.nav-burger {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-burger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 4px 0;
}

/* ====== HERO ====== */

.hero {
  position: relative;
  overflow: hidden;
  padding: 5rem 1.5rem 4rem;
}

.hero-glow {
  position: absolute;
  inset: -20% -10% auto;
  height: 60%;
  background: conic-gradient(from 180deg, transparent, rgba(240, 163, 94, 0.10), transparent 40%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--teal);
  margin-bottom: 1rem;
}

.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(79, 209, 197, 0.5);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  70% { box-shadow: 0 0 0 9px rgba(79, 209, 197, 0); }
  100% { box-shadow: 0 0 0 0 rgba(79, 209, 197, 0); }
}

.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 1.1rem;
}

.accent {
  background: linear-gradient(90deg, var(--amber), var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  color: var(--muted);
  max-width: 34rem;
  margin-bottom: 1.8rem;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-bottom: 1.6rem;
}

.button {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s, box-shadow 0.2s;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  background: linear-gradient(90deg, var(--amber), #d9834a);
  color: #1a120b;
  box-shadow: 0 8px 26px rgba(240, 163, 94, 0.25);
}

.button.secondary {
  border: 1px solid var(--panel-border);
  background: var(--panel);
}

.hero-badges {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  opacity: 0.85;
}

.hero-badges img {
  border-radius: 8px;
}

/* Phone mockup */

.hero-phone {
  text-align: center;
}

.phone-shell {
  width: min(300px, 78vw);
  margin: 0 auto;
  border-radius: 34px;
  border: 1px solid var(--panel-border);
  background: linear-gradient(160deg, #1b2431, #10161f);
  padding: 10px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45), 0 0 0 6px rgba(255, 255, 255, 0.03);
}

.phone-notch {
  width: 44%;
  height: 16px;
  border-radius: 0 0 10px 10px;
  background: #0a0e14;
  margin: 0 auto 8px;
}

.phone-screen {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  aspect-ratio: 240 / 400;
  background: #000;
}

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

.screen-tag {
  position: absolute;
  left: 10px;
  bottom: 10px;
  font-size: 0.7rem;
  color: #cfe8e4;
  background: rgba(10, 14, 20, 0.7);
  border-radius: 6px;
  padding: 2px 7px;
  letter-spacing: 0.08em;
}

.phone-keys {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 12px 0 4px;
}

.phone-keys i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #39424f;
}

.phone-note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

/* ====== SECTIONS ====== */

.section {
  padding: 4.5rem 0;
}

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

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  text-align: center;
  margin-bottom: 0.6rem;
}

.section-sub {
  text-align: center;
  color: var(--muted);
  margin-bottom: 2.6rem;
}

/* About */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2.5rem;
  align-items: center;
}

.about-text {
  color: var(--muted);
}

.about-text strong {
  color: var(--text);
}

.about-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.flow-node {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  text-align: center;
  min-width: 9.5rem;
}

.flow-node span {
  font-size: 1.5rem;
  display: block;
  margin-bottom: 0.3rem;
}

.flow-node b {
  display: block;
  font-size: 0.95rem;
}

.flow-node small {
  color: var(--muted);
  font-size: 0.78rem;
}

.flow-node.highlight {
  border-color: rgba(240, 163, 94, 0.45);
  box-shadow: 0 0 24px rgba(240, 163, 94, 0.12);
}

.flow-arrow {
  color: var(--amber);
  font-size: 1.3rem;
}

/* Stats */

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

.stat-num {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1.2;
}

.stat-label {
  font-weight: 600;
  margin-top: 0.2rem;
}

.stat-sub {
  color: var(--muted);
  font-size: 0.85rem;
}

/* Features */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.feature-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1.4rem;
  transition: transform 0.18s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(240, 163, 94, 0.4);
}

.feature-icon {
  font-size: 1.7rem;
  margin-bottom: 0.7rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.45rem;
}

.feature-card p {
  color: var(--muted);
  font-size: 0.92rem;
}

/* Gallery */

.gallery-group + .gallery-group {
  margin-top: 2.6rem;
}

.gallery-group-title {
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.carousel-wrapper {
  position: relative;
}

.carousel-viewport {
  overflow: hidden;
}

.carousel-track {
  display: flex;
  gap: 1rem;
  transition: transform 0.45s ease;
  will-change: transform;
}

.gallery-item {
  flex: 0 0 calc((100% - 3rem) / 4);
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  background: var(--panel);
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 240 / 400;
  object-fit: cover;
  display: block;
}

.gallery-item.landscape img {
  aspect-ratio: 400 / 240;
}

.gallery-item figcaption {
  padding: 0.45rem 0.7rem;
  font-size: 0.85rem;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.carousel-btn:hover {
  background: var(--accent);
  color: #10151a;
  border-color: var(--accent);
}

.carousel-prev {
  left: -16px;
}

.carousel-next {
  right: -16px;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 1rem;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--panel-border);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.carousel-dot.active {
  background: var(--accent);
  transform: scale(1.25);
}

.gallery-more {
  text-align: center;
  color: var(--muted);
  margin-top: 1.4rem;
  font-size: 0.9rem;
}

/* Architecture */

.arch-diagram {
  max-width: 44rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.arch-layer {
  width: 100%;
  text-align: center;
}

.arch-label {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--teal);
  margin-bottom: 0.5rem;
}

.arch-boxes {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.arch-box {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1rem 1.6rem;
  min-width: 11rem;
}

.arch-box strong {
  display: block;
  margin-bottom: 0.25rem;
}

.arch-box small {
  color: var(--muted);
  font-size: 0.82rem;
}

.arch-box.small {
  min-width: 7rem;
  padding: 0.8rem 1rem;
}

.core-box {
  max-width: 34rem;
  margin: 0 auto;
}

.core-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
  margin-top: 0.7rem;
}

.core-modules span {
  background: rgba(79, 209, 197, 0.09);
  border: 1px solid rgba(79, 209, 197, 0.22);
  color: #9fe8df;
  border-radius: 999px;
  font-size: 0.78rem;
  padding: 0.2rem 0.7rem;
}

.arch-connector {
  color: var(--amber);
  opacity: 0.7;
  line-height: 1;
}

/* Quickstart */

.qs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.qs-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.qs-card h3 {
  margin-bottom: 0.9rem;
}

.qs-card ol {
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.92rem;
  display: grid;
  gap: 0.6rem;
}

.qs-card code {
  background: rgba(0, 0, 0, 0.35);
  border-radius: 6px;
  padding: 0.15rem 0.45rem;
  color: var(--amber);
  font-size: 0.86rem;
  word-break: break-all;
}

/* Footer */

footer {
  background: #0a0e14;
  border-top: 1px solid var(--panel-border);
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.6rem;
}

.footer-col h4 {
  font-size: 0.9rem;
  margin-bottom: 0.7rem;
}

.footer-col a {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.2rem 0;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--amber);
}

.footer-bottom {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--panel-border);
  padding-top: 1.2rem;
}

/* Reveal on scroll */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Responsive */

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

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

@media (max-width: 620px) {
  .nav-links {
    display: none;
  }

  .nav-burger {
    display: block;
    margin-left: auto;
  }

  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: rgba(13, 17, 23, 0.97);
    border-bottom: 1px solid var(--panel-border);
    padding: 1rem 1.5rem;
  }

  .features-grid,
  .qs-grid,
  .stats-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .gallery-item {
    flex: 0 0 calc((100% - 1rem) / 2);
  }
}

@media (max-width: 480px) {
  .gallery-item {
    flex: 0 0 100%;
  }
}