:root {
  --bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-overlay: rgba(255, 255, 255, 0.95);
  --bg-alt: rgba(255, 255, 255, 0.8);
  --accent: #6366f1;
  --accent-hover: #5855eb;
  --user-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --boog-bg: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
  --text-main: #1f2937;
  --text-secondary: #6b7280;
  --border-color: rgba(255, 255, 255, 0.2);
  --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.15);
  --code-bg: rgba(0, 0, 0, 0.05);
  --ok: #10b981;
  --danger: #ef4444;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: linear-gradient(135deg, #1e3a8a 0%, #3730a3 100%);
    --bg-overlay: rgba(17, 24, 39, 0.95);
    --bg-alt: rgba(31, 41, 55, 0.8);
    --user-bg: linear-gradient(135deg, #3730a3 0%, #1e1b4b 100%);
    --boog-bg: linear-gradient(135deg, #374151 0%, #1f2937 100%);
    --text-main: #f3f4f6;
    --text-secondary: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.1);
    --code-bg: rgba(255, 255, 255, 0.05);
  }
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed; inset: 0;
  background: var(--bg-overlay);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  z-index: -1;
}

.container {
  width: 100%; max-width: 700px; margin: 0 auto;
  padding: 2rem 1.5rem 9rem;
  flex: 1; display: flex; flex-direction: column; position: relative;
}

.header { text-align: center; margin-bottom: 2rem; animation: fadeInUp 0.8s ease-out; }
h1 { font-size: 3rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.5rem; text-shadow: 0 2px 10px rgba(0,0,0,.1); }
.subtitle { color: var(--text-secondary); font-size: 1.1rem; font-weight: 300; margin-bottom: 1.5rem; }

#chat { flex: 1; display: flex; flex-direction: column; gap: 1rem; overflow-y: auto; padding-right: .5rem; scroll-behavior: smooth; }
#chat::-webkit-scrollbar { width: 6px; }
#chat::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }

.msg {
  max-width: 80%; padding: 1rem 1.5rem; border-radius: 20px; line-height: 1.6;
  word-wrap: break-word; white-space: pre-wrap; overflow-wrap: anywhere; position: relative;
  animation: messageSlideIn .4s ease-out; box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
}
.user { align-self: flex-end; background: var(--user-bg); color: #fff; border-bottom-right-radius: 8px; transition: transform .2s ease; }
.user:hover { transform: translateY(-2px); }
.boog { align-self: flex-start; background: var(--boog-bg); color: var(--text-main); font-weight: 500; border-bottom-left-radius: 8px; transition: transform .2s ease; border: 1px solid var(--border-color); }
.boog:hover { transform: translateY(-2px); }

.boog h1,.boog h2,.boog h3,.boog h4,.boog h5{margin:1rem 0 .5rem;font-weight:600;color:var(--text-main)}
.boog p{margin:.5rem 0}
.boog ul,.boog ol{margin:.5rem 0;padding-left:1.5rem}
.boog pre{background:var(--code-bg);border-radius:12px;padding:1rem;overflow-x:auto;margin:1rem 0;border:1px solid rgba(255,255,255,.1)}
.boog code{font-family:'JetBrains Mono','Fira Code',monospace;font-size:.9rem;font-weight:500}
.boog blockquote{border-left:4px solid var(--accent);margin:1rem 0;padding-left:1rem;font-style:italic;opacity:.8}

.typing-indicator { display: flex; align-items: center; gap: .5rem; padding: .5rem 0; }
.typing-dots { display: flex; gap: 4px; }
.typing-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--text-secondary); animation: typingBounce 1.4s infinite; }
.typing-dot:nth-child(2){animation-delay:.2s} .typing-dot:nth-child(3){animation-delay:.4s}
@keyframes typingBounce{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-10px)}}

.input-container {
  position: fixed; bottom: 0; left: 0; right: 0;
  padding: 1.5rem; display: flex; justify-content: center;
  background: linear-gradient(to top, var(--bg-overlay) 70%, transparent);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
}
.input-bar {
  display: flex; align-items: center; gap: .5rem;
  width: 100%; max-width: 700px;
  background: var(--bg-alt);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border: 2px solid var(--border-color); border-radius: 25px;
  padding: .5rem .5rem .5rem .75rem;
  box-shadow: var(--shadow-hover); transition: all .3s ease;
}
.input-bar:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(99,102,241,.1), var(--shadow-hover); transform: translateY(-2px); }

.input-bar input[type='text']{
  flex:1; border:none; outline:none; background:transparent;
  font-size:1rem; font-family:'Inter',sans-serif; color:var(--text-main);
  padding:.5rem 1rem; font-weight:400;
}
.input-bar input::placeholder{color:var(--text-secondary);font-weight:300}

/* Mode button (magnifying glass) */
.mode-button {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .2s ease;
  position: relative;
}
.mode-button:hover { color: var(--text-main); border-color: var(--accent); box-shadow: 0 4px 12px rgba(99,102,241,.15); transform: translateY(-1px); }
.mode-button:active { transform: translateY(0); }
.mode-button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 6px 16px rgba(99,102,241,.35);
}
.mode-badge {
  position: absolute; bottom: -6px; right: -6px;
  padding: 2px 6px; border-radius: 10px; font-size: .65rem; font-weight: 600;
  background: var(--accent); color: #fff; display: none;
}
.mode-button.active .mode-badge { display: inline-block; }

.send-button {
  display:flex;align-items:center;justify-content:center;
  width:40px;height:40px;padding:0;background:var(--accent);color:#fff;border:none;border-radius:50%;
  cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px rgba(99,102,241,.3);
}
.send-button:hover:not(:disabled){background:var(--accent-hover);transform:scale(1.05);box-shadow:0 6px 16px rgba(99,102,241,.4)}
.send-button:active{transform:scale(.95)}
.send-button:disabled{background:var(--text-secondary);cursor:not-allowed;transform:none;box-shadow:none}
.send-button.loading{animation:spin 1s linear infinite}
@keyframes spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}

@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes messageSlideIn{from{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}

@media (max-width:768px){
  .container{padding:1.5rem 1rem 8rem;max-width:100%}
  h1{font-size:2.5rem}
  .msg{max-width:90%;padding:.875rem 1.25rem}
}
@media (max-width:480px){
  .container{padding:1rem .75rem 7rem}
  h1{font-size:2rem}
  .msg{max-width:95%;padding:.75rem 1rem}
  .input-container{padding:1rem}
}

*:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
input:focus, button:focus { outline: none; }