@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  /* Premium Light Theme Variables */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-primary: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.6);
  --glass-highlight: rgba(255, 255, 255, 0.9);
  --glass-shadow: 0 10px 40px -10px rgba(31, 38, 135, 0.1);
  --glass-shadow-hover: 0 20px 50px -10px rgba(31, 38, 135, 0.15);
  
  --nav-bg: rgba(255, 255, 255, 0.85);
  --footer-bg: #0f172a;
  --footer-text: #f1f5f9;

  --glow-1: rgba(37, 99, 235, 0.15);
  --glow-2: rgba(16, 185, 129, 0.15);
  --glow-3: rgba(139, 92, 246, 0.15);
}

[data-theme="dark"] {
  /* Premium Dark Theme Variables */
  --bg-primary: #020617;
  --bg-secondary: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-primary: #3b82f6;
  --accent-hover: #60a5fa;
  
  --glass-bg: rgba(15, 23, 42, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
  --glass-shadow-hover: 0 20px 50px -10px rgba(0, 0, 0, 0.7);

  --nav-bg: rgba(2, 6, 23, 0.85);
  --footer-bg: #020617;
  
  --glow-1: rgba(59, 130, 246, 0.2);
  --glow-2: rgba(16, 185, 129, 0.15);
  --glow-3: rgba(139, 92, 246, 0.2);
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.4s ease, color 0.4s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

/* Global Ambient Glow */
body::before, body::after {
  content: '';
  position: fixed;
  width: 60vw;
  height: 60vw;
  border-radius: 50%;
  filter: blur(100px);
  z-index: -1;
  opacity: 0.6;
  animation: float 20s ease-in-out infinite alternate;
  pointer-events: none;
}
body::before {
  top: -20%; left: -10%;
  background: radial-gradient(circle, var(--glow-1) 0%, transparent 70%);
}
body::after {
  bottom: -20%; right: -10%;
  background: radial-gradient(circle, var(--glow-3) 0%, transparent 70%);
  animation-delay: -10s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(5%, 5%) scale(1.1); }
  100% { transform: translate(-5%, -5%) scale(0.9); }
}
@keyframes fadeInSlide {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}
a:hover { color: var(--accent-hover); }

/* Layout */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

main {
  flex: 1;
  padding-top: 150px; /* Floating nav clearance */
}

/* Premium Floating Navigation */
.navbar {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 3rem);
  max-width: 1400px;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-top: 1px solid var(--glass-highlight);
  border-radius: 50px;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: var(--glass-shadow);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-brand {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  white-space: nowrap;
}
.nav-brand img { height: 28px; width: auto; }

.nav-links {
  display: flex;
  gap: 1rem;
  list-style: none;
}
.nav-links a {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
  position: relative;
  white-space: nowrap;
}
.nav-links a::after {
  content: '';
  position: absolute;
  width: 0; height: 2px;
  bottom: -4px; left: 0;
  background-color: var(--accent-primary);
  transition: width 0.3s ease;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  background: none; border: none;
  color: var(--text-primary); cursor: pointer;
  font-size: 1.2rem; padding: 0.5rem;
  border-radius: 50%; transition: all 0.3s;
}
.theme-toggle:hover { background-color: var(--glass-border); transform: rotate(15deg); }

.mobile-menu-btn {
  display: none; background: none; border: none;
  color: var(--text-primary); font-size: 1.5rem; cursor: pointer;
  z-index: 1001;
}

/* Advanced Hero Section */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem;
  border-radius: 2rem;
  margin: 0 auto 5rem;
  max-width: 1500px;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%; right: -50%; bottom: -50%;
  background: conic-gradient(from 180deg at 50% 50%, var(--glow-1), var(--glow-2), var(--glow-3), var(--glow-1));
  animation: spin 10s linear infinite;
  z-index: 0;
}
.hero::after {
  content: '';
  position: absolute;
  top: 1px; left: 1px; right: 1px; bottom: 1px;
  background: var(--bg-primary);
  backdrop-filter: blur(40px);
  border-radius: inherit;
  z-index: 0;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  animation: fadeInSlide 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}
.hero p {
  font-size: clamp(1.2rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  margin-bottom: 3.5rem;
}
.hero-buttons { display: flex; gap: 1.5rem; justify-content: center; flex-wrap: wrap; }

/* Premium Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  border-radius: 50px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  color: white;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.5);
  color: white;
}

.btn-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  box-shadow: var(--glass-shadow);
}
.btn-glass:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Advanced Glass Cards */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-top: 1px solid var(--glass-highlight);
  border-left: 1px solid var(--glass-highlight);
  border-radius: 1.75rem;
  padding: 3rem 2.5rem;
  box-shadow: var(--glass-shadow);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  height: 100%;
  animation: fadeInSlide 0.8s backwards;
}
.glass-card:nth-child(2) { animation-delay: 0.1s; }
.glass-card:nth-child(3) { animation-delay: 0.2s; }
.glass-card:nth-child(4) { animation-delay: 0.3s; }

.glass-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--glass-shadow-hover);
  border-color: var(--accent-primary);
}

/* Fluid Grids - The Ultimate Responsive Solution */
.grid-2, .grid-3, .grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 3rem;
  width: 100%;
}

/* Stats Section */
.stats { margin: 4rem auto; text-align: center; }
.stats .glass-card { align-items: center; justify-content: center; text-align: center; }
.stat-number {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--text-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
  line-height: 1;
}
.stat-label { color: var(--text-secondary); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.85rem; }

/* Forms */
.form-group { margin-bottom: 1.5rem; }
.form-label { display: block; margin-bottom: 0.5rem; font-weight: 600; font-size: 0.95rem; }
.form-control {
  width: 100%;
  padding: 0.85rem 1.2rem;
  border-radius: 1rem;
  border: 1px solid var(--glass-border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  transition: all 0.3s;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}
.form-control:focus {
  outline: none; border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px var(--glow-1);
}

/* Features */
.features-section { padding: 5rem 0; }
.section-title { text-align: center; font-size: clamp(2rem, 4vw, 2.75rem); margin-bottom: 3.5rem; }
.feature-icon { font-size: 2.5rem; margin-bottom: 1.5rem; color: var(--accent-primary); display: inline-block; padding: 1rem; background: var(--glow-1); border-radius: 1rem; }

/* Filter Bar */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.5rem;
  background: var(--glass-bg); padding: 1rem; border-radius: 1.2rem;
  border: 1px solid var(--glass-border); backdrop-filter: blur(16px);
}
.filter-bar .form-control { flex: 1; min-width: 250px; margin-bottom: 0; }

/* Badges */
.badge {
  display: inline-block; padding: 0.35rem 0.85rem; border-radius: 50px;
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
}
.badge.success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge.warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge.danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.badge.primary { background: var(--glow-1); color: var(--accent-primary); }

/* Chat UI */
.chat-container { height: 650px; display: flex; flex-direction: column; }
.chat-messages { flex: 1; overflow-y: auto; padding: 1.5rem; display: flex; flex-direction: column; gap: 1.2rem; }
.message { max-width: 85%; padding: 1.2rem 1.5rem; border-radius: 1.5rem; line-height: 1.6; animation: fadeInSlide 0.3s ease-out; }
.message.user { background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover)); color: white; align-self: flex-end; border-bottom-right-radius: 0.5rem; box-shadow: 0 4px 15px var(--glow-1); }
.message.ai { background: var(--bg-secondary); border: 1px solid var(--glass-border); align-self: flex-start; border-bottom-left-radius: 0.5rem; box-shadow: 0 4px 15px rgba(0,0,0,0.03); }

/* Typing Indicator */
.typing-indicator { display: flex; gap: 0.4rem; padding: 1rem 1.5rem; align-items: center; }
.typing-dot { width: 6px; height: 6px; background: var(--accent-primary); border-radius: 50%; animation: typing 1.4s infinite ease-in-out; }
.typing-dot:nth-child(1) { animation-delay: -0.32s; } .typing-dot:nth-child(2) { animation-delay: -0.16s; }
@keyframes typing { 0%, 80%, 100% { transform: scale(0.5); opacity: 0.5; } 40% { transform: scale(1); opacity: 1; } }

.chat-input-area { display: flex; gap: 1rem; padding-top: 1.5rem; border-top: 1px solid var(--glass-border); }
.chat-input-area input { flex: 1; }

/* Footer */
footer { background-color: var(--footer-bg); color: var(--footer-text); padding: 4rem 0 2rem; margin-top: auto; border-top: 1px solid rgba(255,255,255,0.05); }
.footer-content { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 1.5rem; }
.footer-brand img { height: 45px; background-color: rgba(255,255,255,0.9); border-radius: 10px; padding: 6px; }
.legal-disclaimer { font-size: 0.85rem; opacity: 0.6; max-width: 800px; margin: 2rem auto 0; padding: 1.5rem; border: 1px solid rgba(255,255,255,0.1); border-radius: 1rem; }

/* Premium Mobile Responsive Overlay */
@media (max-width: 1250px) {
  .navbar { width: calc(100% - 1.5rem); padding: 1rem 1.25rem; border-radius: 20px; top: 0.75rem; }
  .nav-controls {
    display: none; /* Hide controls by default on mobile unless opened inside menu */
  }
  .nav-controls.show {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: 2rem;
  }
  .nav-links {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background: var(--nav-bg); backdrop-filter: blur(30px) saturate(200%);
    -webkit-backdrop-filter: blur(30px) saturate(200%);
    flex-direction: column; justify-content: center; align-items: center; gap: 2rem;
    padding: 2rem; transform: translateY(-100%); opacity: 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1); z-index: 999;
  }
  .nav-links.show { transform: translateY(0); opacity: 1; }
  .nav-links a { font-size: 1.5rem; font-weight: 700; letter-spacing: 0.05em; }
  .mobile-menu-btn { display: block; position: relative; z-index: 1001; }
  .hero { padding: 4rem 1.5rem; border-radius: 1.5rem; min-height: 60vh; margin-bottom: 3rem; }
  .btn { width: 100%; text-align: center; }
  .chat-container { height: 500px; }
}