/* ----------------------------------------------------
   Game Flow Studio — Design System & Styles
   Ultra-modern Dark Theme with Vibrant Accents & Glassmorphism
---------------------------------------------------- */

:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #0f1422;
  --bg-tertiary: #161c2e;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 34, 54, 0.9);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(59, 130, 246, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-pink: #ec4899;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --shadow-glow: 0 0 35px rgba(59, 130, 246, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Ambient glow orbs */
.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
}

.glow-top {
  width: 500px;
  height: 500px;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, var(--accent-indigo) 0%, var(--accent-cyan) 60%, transparent 80%);
}

.glow-bottom {
  width: 600px;
  height: 600px;
  bottom: 100px;
  right: -100px;
  background: radial-gradient(circle, var(--accent-purple) 0%, var(--accent-blue) 50%, transparent 80%);
  opacity: 0.2;
}

/* Container */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 13, 20, 0.82);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-box {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: #fff;
}

.brand-badge {
  font-size: 0.7rem;
  color: var(--accent-cyan);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: #fff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
  color: #fff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.btn-hero {
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px rgba(79, 70, 229, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(79, 70, 229, 0.65);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-text-group {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.btn-label {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
}

.btn-sub {
  font-size: 0.75rem;
  opacity: 0.85;
  font-weight: 400;
}

/* Hero Section */
.hero-section {
  padding: 90px 0 60px;
  text-align: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.version-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: #34d399;
  font-weight: 600;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulseAnim 2s infinite;
}

@keyframes pulseAnim {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  max-width: 900px;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
  justify-content: center;
}

.meta-strip {
  display: flex;
  align-items: center;
  gap: 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.meta-val {
  color: var(--text-primary);
  font-weight: 600;
}

.meta-sep {
  width: 1px;
  height: 16px;
  background: var(--border-color);
}

.text-success {
  color: #34d399 !important;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 30px -10px rgba(59, 130, 246, 0.2);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.icon-cyan { background: rgba(6, 182, 212, 0.15); color: #22d3ee; }
.icon-purple { background: rgba(139, 92, 246, 0.15); color: #a78bfa; }
.icon-emerald { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.icon-blue { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.icon-pink { background: rgba(236, 72, 153, 0.15); color: #f472b6; }

.feature-card h3 {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Changelog Section */
.changelog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  max-width: 820px;
  margin: 0 auto;
  box-shadow: var(--shadow-card);
}

.changelog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.badge-version {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  padding: 4px 14px;
  border-radius: var(--radius-sm);
}

.badge-status {
  font-size: 0.82rem;
  font-weight: 600;
  color: #34d399;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.change-date {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.changelog-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
}

.changelog-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.changelog-list li::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.changelog-actions {
  display: flex;
  justify-content: flex-end;
}

/* API Section */
.api-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.api-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.api-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.method {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  text-transform: uppercase;
}

.method.get {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.method.post {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.endpoint {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #f1f5f9;
  word-break: break-all;
}

.api-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.api-desc code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.code-box {
  background: #090c15;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: #e2e8f0;
  line-height: 1.5;
  margin-top: auto;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  margin-top: 60px;
  background: rgba(10, 13, 20, 0.6);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: #fff;
  display: block;
  margin-bottom: 6px;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-copy code {
  color: var(--accent-cyan);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-right a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

.footer-right a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-title { font-size: 2.6rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .api-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-title { font-size: 2.1rem; }
  .features-grid { grid-template-columns: 1fr; }
  .meta-strip { flex-direction: column; gap: 8px; border-radius: var(--radius-md); }
  .meta-sep { display: none; }
  .footer-content { flex-direction: column; gap: 20px; text-align: center; }
  .footer-right { flex-wrap: wrap; justify-content: center; gap: 16px; }
}