/* =============================================
   QWEN AI — CHATBOT CSS
   Theme: Dark editorial + glowing accents
============================================= */
/* ===== MOBILE SIDEBAR FIX ===== */
@media (max-width: 700px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 80%;
    max-width: 300px;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 200;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main {
    margin-left: 0 !important;
  }
}

/* ===== DESKTOP SAFETY ===== */
@media (min-width: 701px) {
  .sidebar {
    transform: translateX(0) !important;
  }
}


/* Fix input zoom issue */
textarea, input {
  font-size: 16px;
}

/* Fix height issues */
html, body {
  height: 100%;
}

body {
  min-height: 100dvh;
}

/* Fix scrolling */
.messages-wrap {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Fix input staying visible */
.input-area {
  position: sticky;
  bottom: 0;
}














:root {
  --bg: #0a0b0f;
  --bg2: #111218;
  --bg3: #16181f;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.15);
  --text: #e8e9ef;
  --text-muted: #6b6f80;
  --text-dim: #3f4256;
  --accent: #7c6af5;
  --accent-glow: rgba(124,106,245,0.3);
  --accent2: #00d4aa;
  --accent2-glow: rgba(0,212,170,0.2);
  --think-bg: #0f1a1a;
  --think-border: #1a3333;
  --think-text: #5dd8c0;
  --user-bg: linear-gradient(135deg, #7c6af5 0%, #5b4de0 100%);
  --ai-bg: #16181f;
  --sidebar-w: 280px;
  --radius: 16px;
  --radius-sm: 10px;
  --font-main: 'Syne', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-serif: 'Instrument Serif', serif;
  --shadow: 0 8px 40px rgba(0,0,0,0.5);
  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="light"] {
  --bg: #f4f4f6;
  --bg2: #ffffff;
  --bg3: #ebebef;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.15);
  --text: #1a1b23;
  --text-muted: #6b6f80;
  --text-dim: #b0b3c6;
  --ai-bg: #ffffff;
  --think-bg: #edfaf6;
  --think-border: #b2e8da;
  --think-text: #0a8a6a;
  --shadow: 0 8px 40px rgba(0,0,0,0.1);
}

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

html { height: 100%; }

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  display: flex;
  position: relative;
}

/* ── Ambient Background ── */
.bg-grid {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none; z-index: 0; opacity: 0.5;
}

.orb {
  position: fixed; border-radius: 50%;
  filter: blur(100px); pointer-events: none; z-index: 0;
  animation: drift 14s ease-in-out infinite alternate;
}
.orb-1 { width: 600px; height: 600px; background: var(--accent-glow); top: -200px; left: -200px; }
.orb-2 { width: 400px; height: 400px; background: var(--accent2-glow); bottom: -100px; right: -100px; animation-delay: -5s; }
.orb-3 { width: 300px; height: 300px; background: rgba(124,106,245,0.1); top: 40%; left: 40%; animation-delay: -9s; }

@keyframes drift {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(40px, 30px) scale(1.08); }
}

/* ── Sidebar ── */
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  z-index: 100;
  transform: translateX(0);
  transition: transform var(--transition);
  backdrop-filter: blur(20px);
}

@media (max-width: 700px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 80%;
    max-width: 300px;
    transform: translateX(-100%);
    z-index: 200;
    transition: transform 0.3s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }
}
@media (min-width: 701px) {
  .sidebar {
    transform: translateX(0) !important;
  }
}

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 18px 12px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.3rem; font-weight: 800; letter-spacing: -0.5px;
}
.logo-icon { font-size: 1.5rem; color: var(--accent); }
.logo-text em { font-style: italic; color: var(--accent); font-family: var(--font-serif); }

.sidebar-toggle-close {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); font-size: 1rem; padding: 6px;
  border-radius: 8px; transition: background var(--transition), color var(--transition);
}
.sidebar-toggle-close:hover { background: var(--border); color: var(--text); }

.new-chat-btn {
  margin: 16px 12px 8px;
  background: var(--accent);
  border: none; border-radius: var(--radius-sm);
  color: #fff; font-family: var(--font-main);
  font-weight: 600; font-size: 0.9rem;
  padding: 11px 16px; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  transition: opacity var(--transition), transform var(--transition);
}
.new-chat-btn:hover { opacity: 0.85; transform: translateY(-1px); }
.new-chat-btn span { font-size: 1.3rem; line-height: 1; }

.sidebar-section-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-dim);
  padding: 12px 18px 6px;
}

.chat-history { flex: 1; overflow-y: auto; padding: 0 8px; }

.history-item {
  padding: 10px 12px; border-radius: var(--radius-sm);
  cursor: pointer; font-size: 0.85rem; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: background var(--transition), color var(--transition);
  display: flex; align-items: center; gap: 8px;
}
.history-item::before { content: '💬'; font-size: 0.8rem; flex-shrink: 0; }
.history-item:hover { background: var(--bg3); color: var(--text); }
.history-item.active { background: var(--accent-glow); color: var(--accent); }

.sidebar-footer {
  padding: 16px; border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 10px;
}

.model-selector label {
  display: block; font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 4px;
}
.model-selector select {
  width: 100%; background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font-family: var(--font-main); font-size: 0.85rem; padding: 8px 10px;
  cursor: pointer; outline: none;
}
.model-selector select:focus { border-color: var(--accent); }

.settings-row { display: flex; gap: 8px; }

/* ── Main ── */
.main {
  flex: 1; display: flex; flex-direction: column;
  margin-left: var(--sidebar-w);
  transition: margin-left var(--transition);
  height: 100vh; overflow: hidden; position: relative; z-index: 1;
}
.main.full-width { margin-left: 0; }

/* ── Topbar ── */
.topbar {
  display: flex; align-items: center;
  padding: 12px 20px; gap: 12px;
  border-bottom: 1px solid var(--border);
  background: rgba(var(--bg2), 0.8);
  backdrop-filter: blur(20px);
  position: relative; z-index: 10;
}
.topbar-center { flex: 1; display: flex; justify-content: center; }
.topbar-actions { display: flex; gap: 6px; }

.model-badge {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 100px; padding: 5px 14px;
  font-size: 0.78rem; font-weight: 600;
  color: var(--text-muted); letter-spacing: 0.03em;
}

/* ── Icon Button ── */
.icon-btn {
  background: none; border: 1px solid var(--border); border-radius: 10px;
  color: var(--text-muted); cursor: pointer; padding: 8px 10px;
  font-size: 1rem; line-height: 1; transition: all var(--transition);
}
.icon-btn:hover { background: var(--bg3); color: var(--text); border-color: var(--border-hover); }

/* ── Messages ── */
.messages-wrap {
  flex: 1; overflow-y: auto; scroll-behavior: smooth;
  padding: 0 max(20px, calc(50% - 400px));
}
.messages { padding: 30px 0 20px; display: flex; flex-direction: column; gap: 24px; }

/* Welcome */
.welcome { text-align: center; padding: 60px 20px 20px; max-width: 600px; margin: 0 auto; }
.welcome-icon { font-size: 3.5rem; margin-bottom: 16px; animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.7;transform:scale(0.95)} }
.welcome h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 10px; }
.welcome h1 em { font-style: italic; font-family: var(--font-serif); color: var(--accent); }
.welcome p { color: var(--text-muted); font-size: 1rem; margin-bottom: 28px; }

.suggestion-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 10px; max-width: 500px; margin: 0 auto;
}
.suggestion {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 14px;
  font-family: var(--font-main); font-size: 0.83rem;
  color: var(--text-muted); cursor: pointer; text-align: left;
  transition: all var(--transition); line-height: 1.4;
}
.suggestion:hover { border-color: var(--accent); color: var(--text); transform: translateY(-2px); box-shadow: 0 4px 20px var(--accent-glow); }

/* Message Bubble */
.msg { display: flex; flex-direction: column; gap: 6px; animation: fadeUp 0.3s ease; }
@keyframes fadeUp { from{opacity:0;transform:translateY(12px)} to{opacity:1;transform:translateY(0)} }

.msg-meta {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.75rem; color: var(--text-dim); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.msg-avatar {
  width: 26px; height: 26px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
}
.msg.user .msg-avatar { background: var(--accent); }
.msg.ai .msg-avatar { background: var(--bg3); border: 1px solid var(--border); }
.msg.user { align-items: flex-end; }
.msg.ai { align-items: flex-start; }

.msg-bubble {
  max-width: min(72ch, 90%); padding: 14px 18px;
  border-radius: var(--radius); line-height: 1.65;
  font-size: 0.92rem; position: relative;
}
.msg.user .msg-bubble {
  background: var(--user-bg);
  color: #fff; border-bottom-right-radius: 4px;
}
.msg.ai .msg-bubble {
  background: var(--ai-bg); border: 1px solid var(--border);
  color: var(--text); border-bottom-left-radius: 4px;
}

/* Thinking Block */
.think-block {
  background: var(--think-bg); border: 1px solid var(--think-border);
  border-radius: var(--radius-sm); margin-bottom: 12px;
  overflow: hidden;
}
.think-header {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; cursor: pointer;
  font-size: 0.78rem; font-weight: 700;
  color: var(--think-text); letter-spacing: 0.06em; text-transform: uppercase;
  user-select: none;
}
.think-header:hover { opacity: 0.8; }
.think-spinner {
  width: 10px; height: 10px; border-radius: 50%;
  border: 2px solid var(--think-border);
  border-top-color: var(--think-text);
  animation: spin 0.8s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }
.think-content {
  padding: 0 14px 12px;
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--think-text); line-height: 1.6;
  opacity: 0.8; max-height: 200px; overflow-y: auto;
  display: none;
}
.think-block.open .think-content { display: block; }
.think-chevron { margin-left: auto; transition: transform 0.2s; }
.think-block.open .think-chevron { transform: rotate(180deg); }

/* Code blocks */
.msg-bubble pre {
  overflow-x: auto; margin: 0;
}
.code-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 14px; background: var(--bg3);
  border-bottom: 1px solid var(--border);
  font-size: 0.72rem; color: var(--text-dim); font-family: var(--font-mono);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.copy-code-btn {
  background: none; border: 1px solid var(--border); border-radius: 5px;
  color: var(--text-muted); cursor: pointer; font-size: 0.7rem; padding: 2px 8px;
  transition: all 0.2s;
}
.copy-code-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Msg actions */
.msg-actions {
  display: flex; gap: 6px; opacity: 0;
  transition: opacity 0.2s;
}
.msg:hover .msg-actions { opacity: 1; }
.msg-action-btn {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 7px; color: var(--text-muted);
  cursor: pointer; font-size: 0.72rem; padding: 3px 8px;
  transition: all 0.2s;
}
.msg-action-btn:hover { background: var(--bg3); color: var(--text); }

/* Typing indicator */
.typing-indicator { display: flex; align-items: center; gap: 5px; padding: 4px 0; }
.typing-indicator span {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--text-dim); display: inline-block;
  animation: blink 1.2s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%,80%,100%{opacity:0.3;transform:scale(0.9)} 40%{opacity:1;transform:scale(1)} }

/* ── Input Area ── */
.input-area {
  padding: 12px max(20px, calc(50% - 400px)) 14px;
  border-top: 1px solid var(--border);
  background: rgba(10,11,15,0.85);
  backdrop-filter: blur(20px);
}
[data-theme="light"] .input-area { background: rgba(244,244,246,0.9); }

.input-toolbar { display: flex; gap: 6px; margin-bottom: 8px; }

.tool-btn {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 100px; color: var(--text-muted);
  cursor: pointer; font-size: 0.78rem; font-weight: 600;
  padding: 5px 12px; transition: all var(--transition);
  display: flex; align-items: center; gap: 5px;
}
.tool-btn:hover { border-color: var(--border-hover); color: var(--text); }
.tool-btn.active { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

.input-box {
  display: flex; align-items: flex-end; gap: 10px;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px 12px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-box textarea {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); font-family: var(--font-main);
  font-size: 0.93rem; line-height: 1.55; resize: none;
  max-height: 200px; overflow-y: auto;
}
.input-box textarea::placeholder { color: var(--text-dim); }

.send-btn {
  background: var(--accent); border: none; border-radius: 10px;
  color: #fff; cursor: pointer; padding: 9px 11px;
  transition: all var(--transition); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.send-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.send-btn:not(:disabled):hover { opacity: 0.85; transform: scale(1.05); }

.attached-preview {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px;
  font-size: 0.78rem; color: var(--text-muted);
  display: flex; align-items: center; gap: 8px; margin-bottom: 6px;
}

.input-footer {
  display: flex; justify-content: space-between;
  font-size: 0.72rem; color: var(--text-dim);
  margin-top: 7px; padding: 0 2px;
}

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px); z-index: 200;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.25s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 20px; width: 480px; max-width: 95vw;
  max-height: 90vh; overflow-y: auto;
  transform: translateY(20px); transition: transform 0.25s;
}
.modal-overlay.open .modal { transform: translateY(0); }

.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 24px; border-bottom: 1px solid var(--border);
}
.modal-header h2 { font-size: 1.1rem; font-weight: 700; }
.modal-close {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; font-size: 1.1rem; padding: 4px 8px;
  border-radius: 8px; transition: background 0.2s;
}
.modal-close:hover { background: var(--bg3); }

.modal-body { padding: 20px 24px; display: flex; flex-direction: column; gap: 20px; }

.setting-group label {
  display: block; font-size: 0.82rem; font-weight: 700;
  color: var(--text-muted); margin-bottom: 8px;
  display: flex; justify-content: space-between;
}
.setting-group input[type=range] {
  width: 100%; accent-color: var(--accent); cursor: pointer;
}
.setting-group textarea {
  width: 100%; background: var(--bg3); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text); font-family: var(--font-main);
  font-size: 0.85rem; padding: 10px 12px; resize: vertical; outline: none;
}
.setting-group textarea:focus { border-color: var(--accent); }
.setting-hint { font-size: 0.72rem; color: var(--text-dim); margin-top: 4px; }

.toggle-group { display: flex; align-items: center; justify-content: space-between; flex-direction: row !important; }
.toggle-group > label:first-child { margin-bottom: 0; }

.toggle { position: relative; display: inline-block; width: 42px; height: 24px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0; background: var(--bg3);
  border-radius: 100px; cursor: pointer;
  border: 1px solid var(--border); transition: all 0.3s;
}
.toggle-slider::before {
  content: ''; position: absolute; width: 16px; height: 16px;
  background: var(--text-muted); border-radius: 50%;
  bottom: 3px; left: 3px; transition: all 0.3s;
}
.toggle input:checked + .toggle-slider { background: var(--accent); border-color: var(--accent); }
.toggle input:checked + .toggle-slider::before { background: #fff; transform: translateX(18px); }

/* ── Toast ── */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 100px; padding: 10px 20px;
  font-size: 0.85rem; color: var(--text);
  opacity: 0; transition: all 0.3s; pointer-events: none; z-index: 999;
  box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Markdown-style formatting */
.msg-bubble h1,.msg-bubble h2,.msg-bubble h3,.msg-bubble h4 { font-weight: 700; margin: 14px 0 6px; line-height: 1.3; }
.msg-bubble h1 { font-size: 1.25rem; color: var(--text); }
.msg-bubble h2 { font-size: 1.08rem; color: var(--text); border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.msg-bubble h3 { font-size: 0.97rem; color: var(--accent); }
.msg-bubble h4 { font-size: 0.9rem;  color: var(--text-muted); }
.msg-bubble p  { margin: 6px 0; line-height: 1.65; }
.msg-bubble ul,.msg-bubble ol { padding-left: 22px; margin: 8px 0; }
.msg-bubble li { margin: 4px 0; line-height: 1.55; }
.msg-bubble strong { font-weight: 700; color: inherit; }
.msg-bubble em { font-style: italic; }
.msg-bubble a { color: var(--accent2); text-decoration: underline; }
.msg-bubble blockquote {
  border-left: 3px solid var(--accent); padding: 6px 12px;
  color: var(--text-muted); margin: 10px 0; font-style: italic;
  background: var(--bg3); border-radius: 0 6px 6px 0;
}
.msg-bubble table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 0.85rem; }
.msg-bubble th,.msg-bubble td { border: 1px solid var(--border); padding: 7px 10px; }
.msg-bubble th { background: var(--bg3); font-weight: 700; text-align: left; }
.msg-bubble tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
.msg-bubble hr { border: none; border-top: 1px solid var(--border); margin: 14px 0; }

/* Code block (fenced) */
.msg-bubble .code-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin: 10px 0;
  overflow: hidden;
}
.msg-bubble .code-block pre {
  margin: 0; padding: 14px 16px;
  overflow-x: auto; font-family: var(--font-mono);
  font-size: 0.82rem; line-height: 1.6;
  background: transparent;
}
.msg-bubble .code-block code {
  font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--accent2); background: none; padding: 0;
}
.msg-bubble .code-lang { text-transform: lowercase; }

/* Inline code */
.msg-bubble code {
  font-family: var(--font-mono); font-size: 0.84em;
  color: var(--accent2); background: var(--bg3);
  padding: 2px 6px; border-radius: 5px;
}

/* Scrollbar */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ── Responsive ── */
@media (max-width: 700px) {
  .sidebar { width: 100%; }
  .main { margin-left: 0 !important; }
  .suggestion-grid { grid-template-columns: 1fr; }
  .messages-wrap { padding: 0 14px; }
  .input-area { padding: 10px 14px 12px; }
}

/* =================================================
   Device-friendly improvements
================================================= */

html, body {
  width: 100%;
  min-height: 100%;
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100dvh;
  height: 100dvh;
  overflow: hidden;
  overflow-x: hidden;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 90;
}

body.sidebar-overlay-open .sidebar-backdrop {
  opacity: 1;
  pointer-events: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 120;
  padding-top: calc(12px + env(safe-area-inset-top));
}

.main,
.sidebar {
  min-height: 100dvh;
}

.main {
  height: 100dvh;
}

.messages-wrap {
  overflow-y: auto;
  overscroll-behavior-y: contain;
  -webkit-overflow-scrolling: touch;
}

.input-area {
  position: sticky;
  bottom: 0;
  z-index: 110;
  padding-bottom: calc(14px + env(safe-area-inset-bottom));
}

.input-box textarea {
  font-size: 16px; /* prevents iOS zoom on focus */
}

@media (max-width: 900px) {
  :root { --sidebar-w: 260px; }

  .messages-wrap {
    padding: 0 16px;
  }

  .input-area {
    padding-left: 16px;
    padding-right: 16px;
  }

  .welcome {
    padding-top: 40px;
  }

  .welcome h1 {
    font-size: clamp(1.8rem, 5vw, 2.35rem);
  }
}

@media (max-width: 700px) {
  body {
    display: block;
  }

  .sidebar {
    width: min(86vw, 320px);
    transform: translateX(-100%);
    box-shadow: var(--shadow);
    border-right: 1px solid var(--border);
    z-index: 1000;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar.collapsed {
    transform: translateX(-100%);
  }

  .main {
    margin-left: 0 !important;
    width: 100%;
    min-height: 100dvh;
    height: 100dvh;
  }

  .main.full-width {
    margin-left: 0 !important;
  }

  .topbar {
    padding: 10px 12px;
    gap: 8px;
  }

  .topbar-center {
    min-width: 0;
  }

  .model-badge {
    max-width: 58vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .messages-wrap {
    padding: 0 12px;
  }

  .messages {
    gap: 18px;
  }

  .welcome {
    padding: 28px 8px 12px;
  }

  .welcome h1 {
    font-size: clamp(1.7rem, 7vw, 2.15rem);
  }

  .welcome p {
    font-size: 0.95rem;
  }

  .suggestion-grid {
    grid-template-columns: 1fr;
    gap: 8px;
    max-width: 100%;
  }

  .suggestion {
    width: 100%;
  }

  .msg-bubble {
    max-width: 100%;
    padding: 12px 14px;
    font-size: 0.92rem;
    word-break: break-word;
    overflow-wrap: anywhere;
  }

  .msg-meta {
    font-size: 0.7rem;
  }

  .input-area {
    padding: 10px 12px calc(12px + env(safe-area-inset-bottom));
  }

  .input-toolbar {
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
  }

  .tool-btn {
    flex: 0 0 auto;
    padding: 6px 10px;
  }

  .input-box {
    gap: 8px;
    padding: 9px 10px;
  }

  .send-btn {
    padding: 9px 10px;
  }

  .input-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    line-height: 1.4;
  }

  .modal {
    width: calc(100vw - 16px);
    max-height: 88dvh;
    border-radius: 16px;
  }

  .modal-header,
  .modal-body {
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.08rem;
  }

  .logo-text {
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .model-badge {
    max-width: 52vw;
    font-size: 0.72rem;
  }

  .icon-btn,
  .tool-btn {
    font-size: 0.72rem;
  }

  .welcome-icon {
    font-size: 3rem;
  }

  .toast {
    width: calc(100vw - 24px);
    max-width: 360px;
    text-align: center;
    white-space: normal;
    border-radius: 16px;
  }
}