:root{
  /* Base Colors */
  --background-color:#0f1419;
  --text-color:#f0f0f0;
  --dim-text-color:#aaa;

  /* UI Elements */
  --header-bg:#171e26;
  --sidebar-bg:#131a22;
  --input-bg:#1e2630;
  --input-focus-bg:#2a3441;

  /* Message Bubbles */
  --user-bubble-bg:linear-gradient(135deg,#0b6fcc,#0a4d8a);
  --assistant-bubble-bg:linear-gradient(135deg,#242f3d,#1a242f);
  --system-bubble-bg:linear-gradient(135deg,#3a4555,#2c3643);

  /* Buttons & Interactive Elements */
  --primary-color:#0084ff;
  --primary-hover:#0077e6;
  --primary-active:#0062c4;
  --secondary-color:#384454;
  --secondary-hover:#445468;
  --secondary-active:#2c3543;
  --success-color:#28a745;
  --danger-color:#dc3545;

  /* Accents */
  --accent-blue:#0084ff;
  --accent-purple:#6f42c1;
  --accent-teal:#20c997;
  --accent-gold:#ffbb33;

  /* Scrollbars & Borders */
  --scrollbar-bg:#1e2630;
  --scrollbar-thumb:#38465a;
  --scrollbar-thumb-hover:#465b75;
  --border-color:#2a3441;

  /* Modals & Overlays */
  --modal-bg:rgba(10,15,25,0.85);
  --modal-content-bg:#171e26;

  /* Layout */
  --sidebar-width:220px;            /* reduced */
  --border-radius-sm:4px;
  --border-radius-md:6px;           /* slightly smaller */
  --border-radius-lg:10px;
  --box-shadow:0 4px 10px rgba(0,0,0,0.25);
  --transition-time:0.18s;

  /* Spacing scale */
  --pad-xs:6px;
  --pad-sm:8px;
  --pad-md:12px;
  --pad-lg:16px;
}

/* Animations (kept but subtle) */
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideIn{from{transform:translateX(-12px);opacity:0}to{transform:translateX(0);opacity:1}}
@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.03)}100%{transform:scale(1)}}

/* Base reset */
*{margin:0;padding:0;box-sizing:border-box;font-family: 'Segoe UI', system-ui, Roboto, Arial, sans-serif}
html,body,#root{height:100%}

/* Global link styling: no underline, preserve color, make bold */
a, a:link, a:visited {
  text-decoration: none;
  color: inherit;
  font-weight: 600; /* bold */
}
a:hover, a:active, a:focus {
  text-decoration: none;
  color: inherit;
  outline: none;
}

/* Also ensure links inside bubbles follow the same rules (extra specificity) */
.bubble a, .message a, header a, #sidebar a {
  text-decoration: none;
  color: inherit;
  font-weight: 600;
}
.bubble a:hover, .message a:hover, header a:hover, #sidebar a:hover {
  text-decoration: none;
  color: inherit;
}

/* Layout */
body{
  display:grid;
  grid-template-columns:var(--sidebar-width) 1fr;
  grid-template-rows:auto 1fr auto;
  height:100vh;
  background:var(--background-color);
  color:var(--text-color);
  overflow:hidden;
  font-size:13.5px; /* smaller base font so more fits */
}

/* Sidebar */
#sidebar{
  grid-row:1 / span 3;
  background:var(--sidebar-bg);
  border-right:1px solid var(--border-color);
  overflow-y:auto;
  padding:16px 12px; /* reduced */
  position:relative;
  transition:transform var(--transition-time) cubic-bezier(.19,1,.22,1);
  box-shadow:2px 0 10px rgba(0,0,0,0.25);
  z-index:50;
}

#sidebar-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--border-color)}
#sidebar-header h2{font-size:1.05rem;font-weight:600;color:var(--primary-color);display:flex;align-items:center;gap:8px}
#savedChats{list-style:none;margin-top:10px}
#savedChats li{padding:8px 10px;margin-bottom:8px;background:var(--input-bg);border:1px solid var(--border-color);border-radius:var(--border-radius-md);cursor:pointer;display:flex;align-items:center;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;box-shadow:0 1px 4px rgba(0,0,0,0.15);animation:fadeIn .25s ease-out}
#savedChats li:before{content:"💬";margin-right:8px;opacity:.7}
#saveChatButton{width:100%;padding:10px;background:var(--primary-color);border-radius:var(--border-radius-md);color:#fff;font-weight:600;display:flex;align-items:center;justify-content:center;gap:8px;border:1px solid rgba(255,255,255,0.06);box-shadow:0 4px 10px rgba(0,0,0,0.25);margin-top:14px}

/* Toggle */
#toggleSidebar{position:absolute;top:8px;right:-36px;background:var(--primary-color);color:#fff;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:none;box-shadow:0 2px 6px rgba(0,0,0,.25);transition:all var(--transition-time);z-index:40}

/* Header */
header{
  grid-column:2;
  background:var(--header-bg);
  border-bottom:1px solid var(--border-color);
  padding:10px 16px; /* reduced */
  box-shadow:0 2px 8px rgba(0,0,0,0.18);
  z-index:10;
  position:relative;
}
.header-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.header-section{display:flex;align-items:center;gap:8px;margin:4px 0;padding:6px 8px;border-radius:var(--border-radius-md);transition:background-color var(--transition-time)}
.header-section:hover{background-color:rgba(255,255,255,0.02)}
header label{font-weight:500;color:var(--dim-text-color);font-size:0.85em}
header input[type="text"], header input[type="number"], header select{padding:6px 8px;border:1px solid var(--border-color);border-radius:var(--border-radius-md);background:var(--input-bg);color:var(--text-color);font-size:0.85em}
.icon-button{width:30px;height:30px;background:var(--secondary-color);border-radius:50%;display:flex;align-items:center;justify-content:center;border:none;cursor:pointer}
.icon-button:hover{background:var(--secondary-hover);transform:scale(1.06)}

/* Buttons */
.btn{padding:8px 12px;border-radius:var(--border-radius-md);font-weight:500;font-size:0.88em;display:inline-flex;align-items:center;gap:8px;min-width:78px}
.btn-primary{background-image:linear-gradient(to bottom,var(--primary-color),var(--primary-hover));color:#fff}
.btn-secondary{background-image:linear-gradient(to bottom,var(--secondary-color),var(--secondary-active));color:#fff}
.btn-danger{background-image:linear-gradient(to bottom,var(--danger-color),#b21f2d);color:#fff}

/* Chat container
   Changed to flex layout so chat-history can flex and avoid being hidden by input/footer.
*/
.chat-container{
  grid-column:2;
  display:flex;
  flex-direction:column;
  padding:12px; /* reduced */
  overflow:hidden;
  background:var(--background-color);
  position:relative;
}

/* preserve top/bottom gradient fade */
.chat-container:before, .chat-container:after{content:"";position:absolute;left:0;right:0;height:18px;pointer-events:none;z-index:5}
.chat-container:before{top:0;background:linear-gradient(to bottom,var(--background-color),transparent)}
.chat-container:after{bottom:0;background:linear-gradient(to top,var(--background-color),transparent)}

/* Chat history - make it flexible (flex:1) so it grows/shrinks to available space.
   Give a bottom padding to ensure last messages are visible above the input.
*/
.chat-history{
  flex:1;
  overflow-y:auto;
  padding:12px 8px 92px 8px; /* bottom padding ensures messages aren't hidden behind input */
  mask-image:linear-gradient(to bottom, transparent, black 18px, black calc(100% - 18px), transparent);
  -webkit-mask-image:linear-gradient(to bottom, transparent, black 18px, black calc(100% - 18px), transparent);
  scroll-behavior:smooth;
}

/* Scrollbar */
.chat-history::-webkit-scrollbar{width:7px}
.chat-history::-webkit-scrollbar-track{background:var(--scrollbar-bg);border-radius:8px}
.chat-history::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:8px}
.chat-history::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb-hover)}

/* Message styling */
.message{margin-bottom:12px;display:flex;flex-direction:column;animation:fadeIn .28s ease-out;position:relative;max-width:86%}
.message.user{align-self:flex-end;align-items:flex-end;margin-left:auto}
.message.assistant{align-self:flex-start;align-items:flex-start;margin-right:auto}
.message.system{align-self:center;align-items:center;max-width:75%}
.bubble{
  padding:10px 12px;            /* reduced */
  border-radius:var(--border-radius-lg);
  font-size:0.92em;            /* slightly smaller */
  line-height:1.4;
  word-wrap:break-word;
  white-space:pre-wrap;
  transition:all var(--transition-time);
  position:relative;
  box-shadow:var(--box-shadow);
  border:1px solid rgba(255,255,255,0.04);
}
.bubble:hover{transform:translateY(-2px);box-shadow:0 6px 12px rgba(0,0,0,0.2)}
.message.user .bubble{background:var(--user-bubble-bg);color:#fff;border-bottom-right-radius:var(--border-radius-sm);border-color:rgba(255,255,255,0.06)}
.message.assistant .bubble{background:var(--assistant-bubble-bg);color:var(--text-color);border-bottom-left-radius:var(--border-radius-sm)}
.message.system .bubble{background:var(--system-bubble-bg);color:var(--dim-text-color);font-style:italic;font-size:0.88em;border-color:rgba(255,255,255,0.05)}

/* bubble tails (subtle) */
.message.user .bubble:before,
.message.assistant .bubble:before{content:"";position:absolute;bottom:-6px;width:12px;height:12px;transform:rotate(45deg);background:inherit;border:inherit;border-width:0 1px 1px 0}
.message.user .bubble:before{right:10px}
.message.assistant .bubble:before{left:10px}

/* Copy button (compact) */
.copy-message-btn{
  position:absolute;top:6px;opacity:0;background:rgba(10,15,24,0.6);border:1px solid rgba(255,255,255,0.06);color:#fff;border-radius:var(--border-radius-md);padding:4px 8px;font-size:0.78em;cursor:pointer;transition:all .12s;display:flex;align-items:center;gap:6px;z-index:10;backdrop-filter:blur(4px)
}
.message.user .copy-message-btn{right:8px}
.message.assistant .copy-message-btn{left:8px}
.bubble:hover .copy-message-btn{opacity:1;transform:translateY(0)}
.copy-message-btn:hover{transform:scale(1.03)}
.copy-message-btn.copied{background:var(--success-color);animation:pulse .45s ease-in-out}

/* Input container (compact) */
.input-container{
  grid-column:2;display:flex;padding:10px 14px;gap:10px;background:var(--header-bg);border-top:1px solid var(--border-color);box-shadow:0 -4px 10px rgba(0,0,0,0.16);z-index:110;position:relative;align-items:center
}
.input-container:before{content:"";position:absolute;top:-2px;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--accent-blue) 20%,var(--accent-purple) 40%,var(--accent-teal) 60%,var(--accent-gold) 80%,transparent);opacity:0.7}
.input-container textarea{flex:1;padding:10px;border:1px solid var(--border-color);border-radius:var(--border-radius-md);background:var(--input-bg);color:var(--text-color);resize:none;font-size:0.95em;line-height:1.4;max-height:160px;box-shadow:inset 0 1px 3px rgba(0,0,0,0.08)}
.input-container textarea:focus{outline:none;background:var(--input-focus-bg);border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(0,132,255,0.14)}
.input-container button{padding:10px 14px;background:var(--primary-color);border-radius:var(--border-radius-md);color:#fff;border:1px solid rgba(255,255,255,0.06);font-weight:600;display:inline-flex;align-items:center;gap:8px;min-width:88px}
.input-container button:hover{transform:translateY(-2px);box-shadow:0 6px 14px rgba(0,0,0,0.16)}

/* Scroll-to-bottom button */
.scroll-to-bottom {
  position: absolute;
  right: 20px;
  bottom: 84px; /* above the input area */
  z-index: 200;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: linear-gradient(90deg,var(--primary-color),var(--primary-hover));
  color: white;
  box-shadow: 0 8px 20px rgba(0,0,0,0.35);
  border: 1px solid rgba(255,255,255,0.06);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
}
.scroll-to-bottom.show { display: inline-flex; animation: slideIn .18s ease-out; }

/* Modal */
.modal{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--modal-bg);display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:all .22s cubic-bezier(.19,1,.22,1);backdrop-filter:blur(4px)}
.modal.show{opacity:1;visibility:visible}
.modal-content{background:var(--modal-content-bg);padding:18px;border-radius:var(--border-radius-lg);width:84%;max-width:760px;display:flex;flex-direction:column;box-shadow:0 12px 28px rgba(0,0,0,0.45);transform:translateY(18px) scale(.99);transition:all .22s}
.modal.show .modal-content{transform:translateY(0) scale(1)}
.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid var(--border-color)}
.modal-title{font-size:1.05rem;font-weight:600}
.modal textarea{width:100%;height:220px;padding:10px;border:1px solid var(--border-color);border-radius:var(--border-radius-md);background:var(--input-bg);color:var(--text-color);resize:vertical;font-size:0.95em}

/* Code blocks (compact) */
.code-block-wrapper{margin:12px 0;border-radius:var(--border-radius-md);overflow:hidden;border:1px solid rgba(255,255,255,0.04);background:var(--codeblock-bg);box-shadow:0 4px 10px rgba(0,0,0,0.22)}
.code-block-header{padding:8px 10px;background:var(--codeblock-header);display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid rgba(255,255,255,0.03)}
.code-block-content{padding:10px;overflow-x:auto;max-height:300px;font-family:Consolas,Monaco,monospace;font-size:0.88em;line-height:1.45;color:#f8f8f2}

/* Notification (compact) */
.notification{position:fixed;bottom:18px;right:18px;padding:10px 12px;border-radius:var(--border-radius-lg);color:white;font-size:0.88em;max-width:320px;box-shadow:0 8px 20px rgba(0,0,0,0.36);transform:translateY(80px) scale(.96);opacity:0;transition:all .32s;z-index:1000;display:flex;align-items:center;gap:10px;backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,0.06)}
.notification.show{transform:translateY(0) scale(1);opacity:1}
.notification.success{background:rgba(40,167,69,0.9)}
.notification.error{background:rgba(220,53,69,0.9)}
.notification.info{background:rgba(0,123,255,0.9)}

/* Responsive */
@media (max-width:900px){
  body{grid-template-columns: 1fr;grid-template-rows:auto auto 1fr auto}
  #sidebar{position:absolute;z-index:1000;height:100%;transform:translateX(-100%);left:0}
  #sidebar.show{transform:translateX(0)}
  #toggleSidebar{right:10px;top:10px}
  header, .chat-container, .input-container{grid-column:1}
  .chat-history{height:auto;padding:12px 8px 120px 8px;}
  .message{max-width:90%}
}

/* Tiny utility tweaks */
.small-label{font-size:0.78rem;color:var(--dim-text-color)}
.status-dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:8px;background:#555;vertical-align:middle}
.status-loading{box-shadow:0 0 6px rgba(255,255,255,0.05);background:linear-gradient(45deg,var(--accent-blue),var(--accent-purple))}
.status-ok{background:var(--accent-blue)}
.status-error{background:var(--danger-color)}