@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

:root {
  --accent: #0155A1;
  --accent-hover: #1e70c1;
  --accent-dark: #004382;
  --accent-glow: rgba(1, 85, 161, 0.35);
  --accent-border: rgba(1, 85, 161, 0.4);
  --bg: #000;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.25);
  --text-primary: #fff;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --glass-bg: rgba(20, 20, 22, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-highlight: rgba(255, 255, 255, 0.18);
  --glass-shadow: rgba(0, 0, 0, 0.5);
  --radius-pill: 100px;
  --radius-card: 24px;
  --radius-sm: 14px;
  --nav-height: 56px;
  --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: 'JetBrains Mono', monospace;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

nav {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.2rem;
  height: var(--nav-height);
  width: min(92%, 820px);
  background: rgba(20, 20, 22, 0.4); 
  backdrop-filter: saturate(180%) blur(50px);
  -webkit-backdrop-filter: saturate(180%) blur(50px);
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  box-shadow:
    inset 1px 1px 0 0 rgba(255, 255, 255, 0.15),
    inset -1px -1px 0 0 rgba(255, 255, 255, 0.05),
    0 4px 24px var(--glass-shadow);
  animation: navSlideDown 0.8s var(--transition-smooth) both;
  transition: width 0.45s var(--transition-smooth),
              border-radius 0.45s var(--transition-smooth),
              padding 0.45s var(--transition-smooth),
              top 0.45s var(--transition-smooth),
              max-width 0.45s var(--transition-smooth);
  will-change: width, border-radius;
}

nav.nav-expanded {
  top: 8px;
  width: calc(100% - 16px);
  max-width: 480px;
  height: auto;
  border-radius: 28px;
  padding: 1rem 1.5rem;
  flex-wrap: wrap;
}

@keyframes navSlideDown {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

nav .nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

nav .nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.5px;
  transition: opacity 0.3s var(--transition-smooth);
  z-index: 102;
  flex-shrink: 0;
}

nav .nav-brand:hover {
  opacity: 0.7;
}

nav .nav-brand .nav-logo {
  height: 22px;
  width: auto;
  filter: brightness(0) invert(1);
}

nav .nav-links {
  display: flex;
  gap: 0.2rem;
  list-style: none;
  align-items: center;
}

nav .nav-links li {
  list-style: none;
}

nav .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-pill);
  transition: all 0.35s var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  text-shadow: 0 0 1px rgba(255, 255, 255, 0.3);
}

nav .nav-links a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

nav .nav-links a.active {
  color: var(--text-primary);
  font-weight: 700;
}

nav .nav-links .nav-icons {
  display: flex;
  gap: 0;
  align-items: center;
  margin-left: 0.2rem;
}

nav .nav-links .nav-icons a {
  padding: 0.45rem 0.55rem;
  font-size: 1rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.4rem;
  transition: color 0.3s var(--transition-smooth);
  z-index: 102;
}

.nav-toggle:hover {
  color: var(--accent);
}

.nav-mobile-links {
  width: 100%;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 0.8rem;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  display: flex;
  transition: max-height 0.45s var(--transition-smooth),
              opacity 0.35s var(--transition-smooth),
              padding-top 0.45s var(--transition-smooth),
              margin-top 0.45s var(--transition-smooth);
  padding-top: 0;
  margin-top: 0;
  border-top-color: transparent;
}

.nav-mobile-links.open {
  max-height: 400px;
  opacity: 1;
  padding-top: 0.8rem;
  margin-top: 0.8rem;
  border-top-color: var(--border);
}

.nav-mobile-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all 0.3s var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transform: translateY(-8px);
  opacity: 0;
  transition: all 0.35s var(--transition-smooth);
}

.nav-mobile-links.open a {
  transform: translateY(0);
  opacity: 1;
}

.nav-mobile-links.open a:nth-child(1) { transition-delay: 0.04s; }
.nav-mobile-links.open a:nth-child(2) { transition-delay: 0.08s; }
.nav-mobile-links.open a:nth-child(3) { transition-delay: 0.12s; }
.nav-mobile-links.open a:nth-child(4) { transition-delay: 0.16s; }
.nav-mobile-links.open a:nth-child(5) { transition-delay: 0.20s; }
.nav-mobile-links.open a:nth-child(6) { transition-delay: 0.24s; }
.nav-mobile-links.open .nav-mobile-icons { transition-delay: 0.28s; }

.nav-mobile-links a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.nav-mobile-links a.active {
  color: var(--text-primary);
  font-weight: 700;
  background: rgba(255, 255, 255, 0.04);
}

.nav-mobile-links a i {
  width: 20px;
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.6;
}

.nav-mobile-links a.active i {
  opacity: 1;
  color: var(--accent);
}

.nav-mobile-icons {
  display: flex;
  gap: 0.3rem;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  margin-top: 0.3rem;
  transform: translateY(-8px);
  opacity: 0;
  transition: all 0.35s var(--transition-smooth);
}

.nav-mobile-links.open .nav-mobile-icons {
  transform: translateY(0);
  opacity: 1;
}

.nav-mobile-icons a {
  flex: 1;
  justify-content: center;
  font-size: 1.15rem;
  transform: none;
  opacity: 1;
}

.nav-mobile-icons a i {
  opacity: 0.8;
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
  animation: fadeInUp 0.9s var(--transition-smooth);
}

.page-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 0.8rem;
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.5px;
}

.page-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.65;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.8rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.4s var(--transition-smooth);
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
  box-shadow: 
    inset 1px 1px 0 0 rgba(255, 255, 255, 0.2),
    inset -1px -1px 0 0 rgba(255, 255, 255, 0.1);
}

.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.15), transparent);
  border-radius: var(--radius-pill) var(--radius-pill) 0 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s var(--transition-smooth);
}

.btn:hover::after {
  opacity: 1;
}

.btn-primary {
  background: var(--accent);
  border-color: rgba(255, 255, 255, 0.1);
  color: #fff;
  box-shadow: 
    inset 1px 1px 0 0 rgba(255, 255, 255, 0.3),
    inset -1px -1px 0 0 rgba(0, 0, 0, 0.2),
    0 4px 20px rgba(1, 85, 161, 0.4);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(1, 85, 161, 0.4);
}

.btn-primary:active {
  background: var(--accent-dark);
  transform: translateY(0) scale(0.98);
}

.btn-ghost {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}

.btn-ghost:hover {
  background: var(--surface-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.btn-ghost:active {
  transform: translateY(0) scale(0.98);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 2.2rem 1.8rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.5s var(--transition-smooth);
  box-shadow:
    inset 1.5px 1.5px 0 0 rgba(255, 255, 255, 0.15),
    inset -1px -1px 0 0 rgba(255, 255, 255, 0.05),
    0 4px 24px rgba(0, 0, 0, 0.3);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
  opacity: 0.6;
}

.glass-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.03), transparent);
  pointer-events: none;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-border);
  background: var(--surface-hover);
  box-shadow:
    0 0 0 0.5px rgba(255, 255, 255, 0.06),
    0 8px 40px rgba(0, 0, 0, 0.3),
    0 0 30px var(--accent-glow);
}

.loading {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1rem;
  padding: 3rem;
}

.loading i {
  color: var(--accent);
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
  display: block;
}

.error {
  text-align: center;
  color: #ff453a;
  background: rgba(255, 69, 58, 0.06);
  padding: 2rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 69, 58, 0.2);
}

.cta {
  text-align: center;
  margin-top: 2.5rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent), #0157AA, var(--accent));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 6s ease-in-out infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

#api-content {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2.5rem;
  border-radius: var(--radius-card);
  margin-top: 1rem;
  overflow-wrap: break-word;
  animation: fadeInUp 0.9s var(--transition-smooth) 0.1s both;
  position: relative;
}

#api-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
  opacity: 0.5;
}

#api-content h1,
#api-content h2,
#api-content h3,
#api-content h4 {
  color: var(--text-primary);
  margin: 2rem 0 1rem 0;
}

#api-content h1 {
  font-size: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.6rem;
}

#api-content h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.4rem;
}

#api-content h3 {
  font-size: 1.25rem;
}

#api-content p {
  text-align: left;
  margin-bottom: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

#api-content code {
  background: rgba(255, 255, 255, 0.06);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  color: var(--accent-hover);
  font-size: 0.84em;
  border: 1px solid rgba(110, 194, 255, 0.1);
}

#api-content pre {
  background: none;
  padding: 1.2rem;
  overflow-x: auto;
  margin: 1.2rem 0;
  -webkit-overflow-scrolling: touch;
}

#api-content pre code {
  background: none;
  padding: 0.1rem;
  color: #e6edf3;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  letter-spacing: 0;
}

#api-content ul,
#api-content ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

#api-content li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

#api-content blockquote {
  border-left: 3px solid var(--accent-border);
  padding: 0.8rem 1.2rem;
  margin: 1.2rem 0;
  background: var(--accent-glow);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

#api-content blockquote p {
  margin: 0;
  color: var(--text-secondary);
  font-style: italic;
}

#api-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  background: rgba(255, 255, 255, 0.015);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: block;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

#api-content th,
#api-content td {
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: 0.8rem 1rem;
  text-align: left;
  min-width: 120px;
}

#api-content th {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
}

#api-content td {
  color: var(--text-secondary);
}

#api-content a {
  color: var(--accent-hover);
  text-decoration: none;
  transition: opacity 0.3s;
  border-bottom: 1px solid rgba(77, 184, 255, 0.3);
}

#api-content a:hover {
  opacity: 1;
  text-decoration: none;
  border-bottom-color: var(--accent-hover);
  text-shadow: 0 0 8px rgba(77, 184, 255, 0.4);
}

#api-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2rem 0;
}

.alert {
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  border-radius: var(--radius-sm);
  border-left: 4px solid;
  font-size: 0.95rem;
  line-height: 1.6;
}

.alert-important {
  background: rgba(255, 193, 7, 0.05);
  border-color: #ffc107;
  color: #ffc107;
}

.alert-note {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}

.alert-warning {
  background: rgba(255, 87, 34, 0.05);
  border-color: #ff5722;
  color: #ff5722;
}

.anchor-header {
  position: relative;
  padding-right: 1.5rem;
}

.anchor-link {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  text-decoration: none;
  opacity: 0;
  font-weight: bold;
  transition: opacity 0.3s var(--transition-smooth);
  font-size: 0.9em;
}

.anchor-header:hover .anchor-link {
  opacity: 1;
}

.scroll-top-btn {
  position: fixed;
  bottom: 0.2rem;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  width: 40px;
  height: 40px;
  background: rgba(20, 20, 22, 0.6);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.4s ease-in, opacity 0.4s ease-in, background 0.2s, box-shadow 0.2s;
  box-shadow:
    inset 1px 1px 0 0 rgba(255, 255, 255, 0.2),
    0 4px 12px rgba(0, 0, 0, 0.3);
}

.scroll-top-btn i {
  font-size: 1rem;
  -webkit-text-stroke: 1px #fff; 
}

.scroll-top-btn.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.5s ease-out;
}

.scroll-top-btn.visible:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateX(-50%) translateY(-4px);
  box-shadow: 
    0 0 20px var(--accent-glow),
    0 8px 24px rgba(0, 0, 0, 0.5);
}

.scroll-top-btn:active {
  transform: translateX(-50%) scale(0.95);
}

html {
  scroll-behavior: smooth;
}

.hero-logo {
  width: min(80%, 320px);
  border-radius: 25%;
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 0 20px rgba(1, 85, 161, 0.5))
         drop-shadow(0 0 60px rgba(1, 85, 161, 0.3));
}

@media (max-width: 768px) {
  nav {
    top: 8px;
    width: calc(100% - 16px);
    padding: 0.8rem 1.2rem;
    height: auto;
    min-height: var(--nav-height);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    border-radius: 24px;
  }

  nav.nav-expanded {
    padding: 0.8rem 1.2rem;
    border-radius: 24px;
  }

  nav .nav-top {
    width: 100%;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
  }

  nav .nav-links {
    display: none;
  }

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

  #api-content {
    padding: 1.5rem;
    border-radius: 18px;
  }
  
  #api-content h1 { font-size: 1.5rem; }
  #api-content h2 { font-size: 1.25rem; }
  #api-content h3 { font-size: 1.1rem; }
  #api-content pre { padding: 1rem; border-radius: 10px; }
  #api-content th, #api-content td { padding: 0.6rem 0.7rem; }
}

@media (min-width: 769px) {
  .nav-mobile-links {
    display: none !important;
  }
}