:root {
    --bg: #1A1A1A;
    --bg-2: #242424;
    --surface: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.2);
    --text: #FFFFFF;
    --muted: #A0A0A0;
    --accent: #2776F5;
    --accent-hover: #1A5BCA;
    --grad: linear-gradient(135deg, #2776F5 0%, #1A5BCA 100%);
    --glow: 0 8px 30px rgba(39, 118, 245, 0.3);
  }
  
  * { box-sizing: border-box; margin: 0; padding: 0; }
  
  html, body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
  }
  
  a { color: inherit; text-decoration: none; }
  button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

  /* Cleaner Ambient Background */
  body::before {
    content: ""; position: fixed; inset: 0; z-index: -2;
    background: radial-gradient(circle at 50% -20%, rgba(39, 118, 245, 0.15), transparent 70%);
  }

  /* NAV */
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 50;
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 40px;
    background: rgba(26, 26, 26, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }
  
  .logo { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
  .logo-mark {
    width: 36px; height: 36px; border-radius: 8px;
    background: var(--accent);
    display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 18px;
  }
  
  .nav-links { display: flex; gap: 32px; font-size: 14px; font-weight: 500; color: var(--muted); }
  .nav-links a { transition: color .2s; }
  .nav-links a:hover { color: var(--text); }
  
  .nav-cta { display: flex; gap: 12px; align-items: center; }

  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; border-radius: 8px; font-size: 14px; font-weight: 600;
    transition: all .2s ease;
  }
  .btn-ghost { color: var(--muted); }
  .btn-ghost:hover { color: var(--text); background: var(--surface); }
  .btn-outline { border: 1px solid var(--border-strong); color: var(--text); }
  .btn-outline:hover { background: var(--surface); border-color: var(--accent); }
  .btn-primary {
    background: var(--accent); color: #fff;
    box-shadow: 0 4px 14px rgba(39, 118, 245, 0.4);
  }
  .btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
  .btn-lg { padding: 14px 28px; font-size: 16px; border-radius: 10px; }

  /* HERO */
  .hero {
    min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center;
    text-align: center; padding: 160px 24px 80px; position: relative;
  }
  
  .eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; border: 1px solid var(--accent); border-radius: 999px;
    font-size: 12px; font-weight: 600; color: var(--accent); margin-bottom: 24px;
    background: rgba(39, 118, 245, 0.1);
  }
  .eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
  
  h1 {
    font-size: clamp(40px, 7vw, 72px); line-height: 1.1; letter-spacing: -0.04em; font-weight: 700;
    max-width: 900px; margin-bottom: 24px;
  }
  h1 .serif {
    font-family: '', serif; font-weight: 400; font-style: italic;
    color: var(--accent);
  }
  
  .sub { color: var(--muted); font-size: clamp(16px, 2vw, 20px); max-width: 600px; line-height: 1.6; margin-bottom: 48px; }

  /* Prompt box */
  .prompt-wrap {
    width: 100%; max-width: 760px;
    background: var(--bg-2);
    border: 1px solid var(--border-strong); border-radius: 16px; padding: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
  }
  .prompt-inner {
    background: var(--bg); border-radius: 10px; padding: 20px;
    display: flex; flex-direction: column; gap: 16px; border: 1px solid var(--border);
  }
  .prompt-inner textarea {
    width: 100%; background: none; border: none; color: var(--text);
    font-family: inherit; font-size: 16px; resize: none; outline: none; min-height: 80px;
  }
  .prompt-inner textarea::placeholder { color: var(--muted); }
  .prompt-tools { display: flex; justify-content: space-between; align-items: center; }
  
  .chip-row { display: flex; gap: 10px; flex-wrap: wrap; }
  .chip {
    font-size: 13px; color: var(--muted); padding: 6px 14px; border-radius: 6px;
    background: var(--surface); transition: all .2s; cursor: pointer; font-weight: 500;
  }
  .chip:hover { color: var(--text); background: rgba(255,255,255,0.1); }
  
  .send-btn {
    width: 44px; height: 44px; border-radius: 8px; background: var(--accent);
    display: grid; place-items: center; color: #fff; transition: background .2s;
  }
  .send-btn:hover { background: var(--accent-hover); }

  .suggestions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-top: 32px; max-width: 800px; }
  .suggestion {
    font-size: 14px; color: var(--muted); padding: 10px 18px; border-radius: 8px;
    border: 1px solid var(--border); background: transparent; cursor: pointer; transition: all .2s;
  }
  .suggestion:hover { color: var(--text); border-color: var(--accent); background: rgba(39, 118, 245, 0.05); }

  /* SECTIONS */
  section { padding: 100px 24px; max-width: 1200px; margin: 0 auto; }
  .section-head { text-align: center; margin-bottom: 64px; }
  .section-eyebrow { font-size: 14px; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 16px; font-weight: 600; }
  h2 { font-size: clamp(32px, 4vw, 48px); letter-spacing: -0.03em; font-weight: 700; line-height: 1.2; margin-bottom: 20px; }
  h2 .serif { font-family: 'Instrument Serif', serif; font-weight: 400; font-style: italic; color: var(--accent); }
  .section-sub { color: var(--muted); font-size: 18px; max-width: 600px; margin: 0 auto; line-height: 1.6; }

  /* Features grid */
  .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .card {
    background: var(--bg-2); border: 1px solid var(--border); border-radius: 16px; padding: 40px 32px;
    transition: all .3s;
  }
  .card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
  .card-icon {
    width: 48px; height: 48px; border-radius: 10px; background: rgba(39, 118, 245, 0.1);
    color: var(--accent); display: grid; place-items: center; margin-bottom: 24px;
  }
  .card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; letter-spacing: -0.01em; }
  .card p { color: var(--muted); font-size: 15px; line-height: 1.6; }

  /* Showcase */
  .showcase { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .show-card {
    aspect-ratio: 4/3; border-radius: 16px; background: var(--bg-2); border: 1px solid var(--border);
    overflow: hidden; position: relative; cursor: pointer; transition: all .3s;
  }
  .show-card:hover { border-color: var(--accent); transform: translateY(-4px); }
  .show-card .label {
    position: absolute; bottom: 0; left: 0; right: 0; padding: 20px;
    background: linear-gradient(0deg, rgba(0,0,0,0.9), transparent);
    display: flex; justify-content: space-between; align-items: end;
  }

  /* Pricing */
  .pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 1000px; margin: 0 auto; }
  .price-card {
    background: var(--bg-2); border: 1px solid var(--border); border-radius: 16px; padding: 40px;
    position: relative;
  }
  .price-card.featured {
    border-color: var(--accent); background: linear-gradient(180deg, rgba(39, 118, 245, 0.05), transparent);
    box-shadow: 0 0 40px rgba(39, 118, 245, 0.15);
  }
  .price-card .tier { font-size: 14px; color: var(--accent); text-transform: uppercase; margin-bottom: 16px; font-weight: 600; }
  .price { font-size: 48px; font-weight: 700; letter-spacing: -0.03em; margin-bottom: 8px; }
  .price span { font-size: 16px; color: var(--muted); font-weight: 400; }
  .price-desc { color: var(--muted); font-size: 15px; margin-bottom: 32px; line-height: 1.5; }
  .price-features { list-style: none; display: flex; flex-direction: column; gap: 16px; margin-bottom: 40px; }
  .price-features li { font-size: 15px; color: #E0E0E0; display: flex; align-items: center; gap: 12px; }
  .price-features li::before {
    content: ""; width: 20px; height: 20px; border-radius: 50%; background: rgba(39, 118, 245, 0.1);
    display: grid; place-items: center; flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%232776F5' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: center;
  }

  /* CTA */
  .cta-section { text-align: center; padding: 100px 24px; max-width: 800px; margin: 0 auto; }
  .cta-box {
    border: 1px solid var(--border-strong); border-radius: 24px; padding: 80px 40px;
    background: var(--bg-2);
  }

  /* Footer */
  footer { border-top: 1px solid var(--border); padding: 80px 24px 40px; color: var(--muted); font-size: 14px; background: var(--bg-2); }
  .foot-wrap { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px; }
  .foot-wrap h4 { color: var(--text); font-size: 14px; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 20px; font-weight: 600; }
  .foot-wrap ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
  .foot-wrap a:hover { color: var(--text); }
  .foot-bottom { max-width: 1200px; margin: 60px auto 0; padding-top: 30px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }

  /* MODAL */
  .modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(8px);
    display: none; align-items: center; justify-content: center; z-index: 100; padding: 20px;
  }
  .modal-overlay.active { display: flex; }
  .modal {
    width: 100%; max-width: 440px; background: var(--bg-2);
    border: 1px solid var(--border-strong); border-radius: 16px; padding: 40px; position: relative;
  }
  .modal-close { position: absolute; top: 20px; right: 20px; width: 32px; height: 32px; border-radius: 8px; display: grid; place-items: center; transition: all .2s; }
  .modal-close:hover { background: var(--surface); color: #fff; }
  .modal-logo {
    width: 48px; height: 48px; border-radius: 12px; background: var(--accent);
    display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 24px; margin-bottom: 24px;
  }
  .modal h3 { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
  .modal p.muted { color: var(--muted); font-size: 15px; margin-bottom: 32px; }
  
  .field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
  .field label { font-size: 14px; font-weight: 500; color: var(--muted); }
  .field input {
    background: var(--bg); border: 1px solid var(--border-strong); border-radius: 8px;
    padding: 14px; color: var(--text); font-family: inherit; font-size: 15px; outline: none; transition: border-color .2s;
  }
  .field input:focus { border-color: var(--accent); }
  .modal .btn { width: 100%; margin-top: 8px; }
  
  .divider { display: flex; align-items: center; gap: 16px; color: var(--muted); font-size: 13px; margin: 24px 0; }
  .divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
  
  .social-row { display: flex; flex-direction: column; gap: 12px; }
  .social-btn {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    padding: 12px; border: 1px solid var(--border-strong); border-radius: 8px;
    font-size: 14px; font-weight: 500; background: transparent; transition: all .2s;
  }
  .social-btn:hover { background: var(--surface); border-color: var(--accent); }
  .modal-switch { text-align: center; margin-top: 24px; font-size: 14px; color: var(--muted); }
  .modal-switch a { color: var(--accent); font-weight: 500; cursor: pointer; }

  /* Responsive Constraints */
  @media (max-width: 900px) {
    nav { padding: 16px 20px; }
    .nav-links { display: none; }
    .hero { padding-top: 120px; }
    .grid, .showcase, .pricing { grid-template-columns: 1fr; }
    .foot-wrap { grid-template-columns: 1fr; gap: 40px; }
    section { padding: 80px 20px; }
    .cta-box { padding: 40px 24px; }
  }

  .sidebar-footer { margin-top: 32px; display: flex; justify-content: center; width: 100%; }
  .legal-link-btn {
    font-size: 12px; color: var(--muted); font-weight: 500; padding: 8px 16px;
    border-radius: 6px; text-decoration: none; transition: all 0.2s ease;
    display: inline-flex; align-items: center; gap: 6px;
  }
  .legal-link-btn:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
  .blue {
    font-family: 'Instrument Serif', serif; font-weight: 400; font-style: italic;
    color: var(--accent);
  }
  /* Styling to position the button in the hero section */
.new-chat-container {
  display: flex;
  justify-content: center;
  margin-bottom: 24px; /* Space between button and the H1 title */
}

.btn-massive {
  font-size: 18px;
  padding: 16px 48px;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  /* This ensures it uses the same styles as your existing .btn-primary */
}

/* Splash Screen Overlay Containers */
.splash-screen {
  position: fixed; 
  top: 0; 
  left: 0; 
  width: 100%; 
  height: 100%;
  background: #0a0a0a; /* Dark background matching the app theme */
  display: flex; 
  align-items: center;
  justify-content: center; 
  z-index: 100000; /* Keeps overlay above all other elements */
  opacity: 1; 
  transition: opacity 0.5s ease;
}

.splash-logo {
  display: flex;
  gap: 1px;
}

/* Individual Animating Letters */
.splash-letter {
  font-family: 'Inter', sans-serif;
  font-size: 40px;
  font-weight: 800;
  color: #fff;
  opacity: 0;
  transform: translateY(20px);
  animation: slideInLetter 0.5s cubic-bezier(0.215, 0.610, 0.355, 1) forwards;
}

/* Serif font style override for 'A' and 'I' */
.splash-letter.serif {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-weight: 400;
}

/* Letter entry keyframes */
@keyframes slideInLetter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}