@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500&family=Inter:wght@400;500;700&display=swap');

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

  :root {
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --bg:       #ffffff;
    --bg-accent: rgba(0, 0, 0, 0.045);
    --fg:       #000000;
    --muted:    rgba(0, 0, 0, 0.78);
    --muted2:   rgba(0, 0, 0, 0.50);
    --muted-60: rgba(0, 0, 0, 0.60);
    --border:   rgba(0, 0, 0, 0.12);
    --surface:  rgba(255, 255, 255, 0.74);
    --surface-strong: rgba(255, 255, 255, 0.9);
    --shadow:   0 18px 50px -34px rgba(0, 0, 0, 0.18);
    --nav-pill-bg: rgba(0, 0, 0, 0.06);
    --nav-pill-border: rgba(0, 0, 0, 0.15);
    --user-bub: #000000;
    --user-fg:  #ffffff;
    --ai-bub:   rgba(255, 255, 255, 0.76);
    --ai-fg:    #000000;
    --sidebar-w: 260px;
    --tab-w:     28px;
    --font: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-display: "Fraunces", Georgia, serif;
    --radius: 18px;
  }
  :root.dark {
    --bg:       #141646;
    --bg-accent: rgba(255, 255, 255, 0.10);
    --fg:       #ffffff;
    --muted:    rgba(255, 255, 255, 0.84);
    --muted2:   rgba(255, 255, 255, 0.58);
    --muted-60: rgba(255, 255, 255, 0.65);
    --border:   rgba(255, 255, 255, 0.14);
    --surface:  rgba(20, 22, 70, 0.62);
    --surface-strong: rgba(24, 27, 83, 0.82);
    --sidebar-surface: rgba(11, 13, 52, 0.88);
    --shadow:   0 24px 60px -34px rgba(4, 8, 28, 0.75);
    --nav-pill-bg: rgba(255, 255, 255, 0.14);
    --nav-pill-border: rgba(255, 255, 255, 0.25);
    --user-bub: #ffffff;
    --user-fg:  #141646;
    --ai-bub:   rgba(255, 255, 255, 0.08);
    --ai-fg:    #ffffff;
  }

  html, body {
    height: 100%; overflow: hidden;
    background: var(--bg); color: var(--fg);
    font-family: var(--font); font-size: 15px;
    transition: background .25s, color .25s;
  }

  body {
    position: relative;
    background:
      radial-gradient(circle at top left, var(--bg-accent), transparent 32%),
      radial-gradient(circle at bottom right, rgba(127, 127, 127, 0.08), transparent 24%),
      var(--bg);
  }
  :root.dark body {
    background: var(--bg);
  }

  body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
      radial-gradient(circle at 12% 10%, rgba(255, 255, 255, 0.34), transparent 18%),
      radial-gradient(circle at 88% 82%, rgba(255, 255, 255, 0.08), transparent 22%);
    opacity: .7;
  }
  :root.dark body::before {
    background: none;
    opacity: 0;
  }

  /* ── ROOT LAYOUT ── */
  .app {
    display: flex; height: 100vh; height: 100dvh; position: relative; overflow: hidden;
    isolation: isolate;
    background: var(--bg);
  }

  .main {
    flex: 1; min-width: 0; height: 100vh; height: 100dvh;
    display: flex; flex-direction: column;
    position: relative;
    background: var(--bg);
  }
  .main.composer-centered .messages {
    padding: 0;
    justify-content: center;
  }
  .main.composer-centered .input-area {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    max-width: none;
    margin: 0;
    pointer-events: none;
    padding: 40px 28px 28px;
  }
  .main.composer-centered .composer-hero,
  .main.composer-centered .input-row {
    pointer-events: auto;
  }
  .main.composer-centered .composer-hero {
    text-align: left;
  }
  .main.composer-centered .input-row {
    width: min(720px, 100%);
    min-height: 124px;
    border-radius: 28px;
    padding: 14px 14px 12px 16px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto auto;
    grid-template-areas:
      "preview preview preview"
      "textarea textarea textarea"
      "attach controls send";
    column-gap: 10px;
    row-gap: 10px;
    align-items: end;
  }
  .main.composer-centered .input-main {
    display: contents;
  }
  .main.composer-centered .image-preview-row {
    grid-area: preview;
  }
  .main.composer-centered textarea {
    grid-area: textarea;
    flex: 1;
    width: 100%;
    min-height: 38px;
    font-size: 15px;
    text-align: left;
    padding: 0;
  }
  .main.composer-centered .composer-controls {
    grid-area: controls;
    justify-content: space-between;
  }
  .main.composer-centered .attach-trigger {
    grid-area: attach;
    position: static;
  }
  .main.composer-centered .send-wrap {
    grid-area: send;
  }

  /* ── SIDEBAR ── */
  .sidebar {
    width: 290px;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column;
    transition: width .25s cubic-bezier(.4,0,.2,1), border-right .25s;
    position: relative; z-index: 20;
    background: var(--nav-pill-bg);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.12);
    height: 100vh;
    overflow: hidden;
  }
  :root.dark .sidebar {
    background: var(--sidebar-surface);
  }
  .sidebar.closed { width: 0; border-right: none; }
  .sidebar.closed .sidebar-header,
  .sidebar.closed .history-list,
  .sidebar.closed .settings-panel,
  .sidebar.closed .sidebar-footer { opacity: 0; pointer-events: none; }
  .sidebar-header, .history-list, .settings-panel, .sidebar-footer { transition: opacity .15s; }

  /* Pull tab on right edge of sidebar */
  /* toggle button sits in top-left of main area */
  .sidebar-toggle {
    position: absolute; top: 12px; left: 14px; z-index: 5;
    width: 38px; height: 38px; border-radius: 999px;
    border: 1px solid var(--nav-pill-border); background: var(--nav-pill-bg);
    color: var(--muted); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow);
    transition: border-color .15s, color .15s, transform .15s, background .15s;
  }
  .sidebar-toggle:hover { border-color: var(--fg); color: var(--fg); transform: translateY(-1px); }
  .sidebar-toggle svg { transition: transform .25s cubic-bezier(.4,0,.2,1); }
  .sidebar.closed ~ .main .sidebar-toggle svg { transform: rotate(180deg); }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    border: 0;
    padding: 0;
    margin: 0;
    background: rgba(8, 10, 24, 0.36);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease;
    z-index: 19;
  }

  /* Sidebar header */
  .sidebar-header {
    padding: 24px 20px 18px;
    border-bottom: 1px solid var(--border);
    display: flex; flex-direction: column; gap: 10px;
  }
  .sidebar-title {
    font-size: 26px; font-weight: 400; color: var(--fg);
    font-family: var(--font-display);
    letter-spacing: -.02em;
  }
  .new-chat-btn {
    width: 100%; padding: 12px 15px;
    background: var(--nav-pill-bg); color: var(--fg);
    border: 1px solid var(--nav-pill-border); border-radius: 999px;
    font-size: 14px; font-family: var(--font);
    cursor: pointer; text-align: left;
    display: flex; align-items: center; gap: 7px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,.22), 0 8px 24px -20px rgba(0, 0, 0, 0.35);
    transition: border-color .15s, transform .15s, background .15s;
  }
  .new-chat-btn:hover { border-color: var(--fg); transform: translateY(-1px); }
  .new-chat-btn svg { flex-shrink: 0; }

  /* Sidebar bottom controls */
  .sidebar-footer {
    padding: 14px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    display: flex; align-items: center; justify-content: space-between;
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.03));
  }
  .sidebar-footer-label {
    font-size: 11px;
    color: var(--muted2);
    letter-spacing: .01em;
    opacity: .72;
  }
  .footer-btns { display: flex; gap: 6px; }
  .theme-wrap { position: relative; }
  .sdbtn {
    width: 32px; height: 32px; border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.10);
    background: rgba(255, 255, 255, 0.04);
    color: var(--muted2); cursor: pointer; font-size: 12px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font);
    opacity: .78;
    box-shadow: none;
    transition: border-color .15s, color .15s, transform .15s, background .15s, opacity .15s;
  }
  .sidebar-footer:hover .sidebar-footer-label,
  .sidebar-footer:focus-within .sidebar-footer-label {
    opacity: 1;
    color: var(--muted);
  }
  .sidebar-footer:hover .sdbtn,
  .sidebar-footer:focus-within .sdbtn {
    opacity: .92;
  }
  .sdbtn:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
    color: var(--fg);
    transform: translateY(-1px);
    opacity: 1;
  }
  .theme-btn { position: relative; overflow: hidden; }
  .theme-icon {
    width: 15px;
    height: 15px;
    display: block;
    object-fit: contain;
  }
  .theme-icon-light { display: none; }
  .theme-icon-dark { display: block; }
  :root.dark .theme-icon-light { display: block; }
  :root.dark .theme-icon-dark { display: none; }
  .theme-dropdown {
    position: fixed;
    background: var(--nav-pill-bg);
    border: 1px solid var(--nav-pill-border);
    border-radius: 18px;
    padding: 8px;
    min-width: 150px;
    display: none;
    z-index: 1000;
    box-shadow: var(--shadow);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
  }
  .theme-dropdown.open { display: block; }
  .theme-option {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-family: var(--font);
    color: var(--fg);
    text-align: left;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background .1s;
  }
  .theme-option:hover { background: var(--surface); }
  .theme-option.selected { font-weight: 600; }
  .theme-option .opt-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--muted2);
    flex-shrink: 0;
    transition: background .15s;
  }
  .theme-option.selected .opt-dot { background: var(--fg); }

  /* Chat history list */
  .history-list {
    flex: 1; overflow-y: auto; overflow-x: visible; padding: 12px 10px;
    scrollbar-width: none; display: flex; flex-direction: column; gap: 1px;
  }
  .history-list::-webkit-scrollbar { display: none; }

  .history-section-label {
    font-size: 11px; font-weight: 700; color: var(--muted-60);
    text-transform: uppercase; letter-spacing: .09em;
    padding: 14px 12px 8px;
  }

  .history-item {
    padding: 13px 14px; border-radius: 18px;
    font-size: 15px; color: var(--muted);
    cursor: pointer;
    transition: background .15s, color .15s, border-color .15s, transform .15s;
    display: flex; align-items: center; justify-content: space-between;
    gap: 6px; position: relative;
    border: 1px solid transparent;
  }
  .history-item:hover { background: var(--nav-pill-bg); color: var(--fg); border-color: var(--nav-pill-border); transform: translateX(1px); }
  .history-item.active { background: var(--nav-pill-bg); color: var(--fg); border-color: var(--nav-pill-border); box-shadow: 0 12px 24px -24px rgba(0, 0, 0, 0.35); }
  .history-item-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
  .history-delete {
    opacity: 0; flex-shrink: 0;
    width: 16px; height: 16px;
    background: none; border: none; cursor: pointer;
    color: var(--muted); font-size: 11px;
    display: flex; align-items: center; justify-content: center;
    transition: opacity .1s, color .1s;
    padding: 0;
  }
  .history-item:hover .history-delete { opacity: 1; }
  .history-delete:hover { color: var(--fg); }

  /* SETTINGS PANEL inside sidebar */
  .settings-panel {
    display: none; flex-direction: column;
    padding: 20px 20px;
    border-top: 1px solid var(--border);
    gap: 10px;
    overflow-y: auto;
    max-height: 60vh;
  }
  .settings-panel.open { display: flex; }
  .settings-panel h3 {
    font-size: 11px; font-weight: 600; color: var(--muted);
    text-transform: uppercase; letter-spacing: .1em;
    margin-bottom: 2px; margin-top: 6px;
  }
  .settings-panel h3:first-child { margin-top: 0; }
  .setting-row { display: flex; flex-direction: column; gap: 3px; }
  .setting-row label { font-size: 12px; color: var(--muted); }
  .setting-row input, .setting-row select, .setting-row textarea {
    width: 100%; background: var(--nav-pill-bg); border: 1px solid var(--nav-pill-border);
    color: var(--fg); border-radius: 16px; padding: 11px 13px;
    font-size: 13px; font-family: var(--font); outline: none;
    transition: border-color .15s, background .15s, box-shadow .15s;
  }
  .setting-row textarea {
    min-height: 52px;
    line-height: 1.5;
    resize: none;
    overflow: hidden;
  }
  .setting-row input:focus, .setting-row select:focus, .setting-row textarea:focus { border-color: var(--fg); box-shadow: 0 0 0 3px rgba(127, 127, 127, 0.12); }
  .sdivider { height: 1px; background: var(--border); }

  /* MESSAGES */
  .messages {
    flex: 1; overflow-y: auto; overflow-x: hidden;
    padding: 82px 0 24px;
    display: flex; flex-direction: column; gap: 2px;
    scroll-behavior: smooth; scrollbar-width: none;
  }
  .messages::-webkit-scrollbar { display: none; }

  /* inner width constraint */
  .bubble-group, .empty-state { max-width: 760px; width: 100%; margin-left: auto; margin-right: auto; padding: 0 28px; }

  .bubble-group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 10px; padding: 0 28px; }
  .bubble-group.user { align-items: flex-end; }
  .bubble-group.ai   { align-items: flex-start; }

  .bubble-row { display: flex; align-items: flex-end; gap: 9px; max-width: 82%; }
  .bubble-group.user .bubble-row { flex-direction: row-reverse; }
  .bubble-group.ai   .bubble-row { flex-direction: row; }

  .bubble {
    padding: 14px 18px; border-radius: 22px;
    font-size: 16px; line-height: 1.7; word-break: break-word;
    opacity: 0; transform: translateY(5px) scale(.98);
    animation: bPop .22s cubic-bezier(.34,1.56,.64,1) forwards;
    border: 1px solid var(--border);
    box-shadow: 0 16px 40px -32px rgba(0, 0, 0, 0.35);
  }
  @keyframes bPop { to { opacity:1; transform:translateY(0) scale(1); } }
  .bubble.user-bubble { background: var(--user-bub); color: var(--user-fg); border-bottom-right-radius: 6px; border-color: transparent; }
  .bubble.ai-bubble   { background: var(--ai-bub);   color: var(--ai-fg);   border-bottom-left-radius: 6px; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }

  .bubble-group.user .bubble-row:not(:last-child)  .bubble { border-bottom-right-radius: var(--radius); }
  .bubble-group.user .bubble-row:not(:first-child) .bubble { border-top-right-radius: var(--radius); }
  .bubble-group.ai   .bubble-row:not(:last-child)  .bubble { border-bottom-left-radius: var(--radius); }
  .bubble-group.ai   .bubble-row:not(:first-child) .bubble { border-top-left-radius: var(--radius); }

  /* TTS */
  .tts-btn {
    opacity: 0; flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
    background: none; border: 1px solid var(--border); color: var(--muted);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    transition: all .15s; align-self: center;
  }
  .bubble-row:hover .tts-btn { opacity: 1; }
  .tts-btn:hover { border-color: var(--fg); color: var(--fg); }
  .tts-btn.playing { opacity:1; border-color:var(--fg); color:var(--fg); animation: sPulse .7s infinite alternate; }
  @keyframes sPulse { to { transform: scale(1.12); } }

  /* Typing */
  .typing-indicator {
    display: flex; align-items: center; gap: 6px; padding: 12px 16px;
    background: var(--ai-bub); border-radius: var(--radius); border-bottom-left-radius: 4px;
    width: fit-content; opacity: 0; animation: bPop .22s ease forwards;
    border: 1px solid var(--border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
  .typing-dot {
    width: 6px; height: 6px; border-radius: 50%; background: var(--muted);
    animation: tBounce 1.2s infinite;
  }
  .typing-dot:nth-child(2) { animation-delay:.2s; }
  .typing-dot:nth-child(3) { animation-delay:.4s; }
  @keyframes tBounce { 0%,60%,100%{transform:translateY(0)} 30%{transform:translateY(-4px)} }

  /* Gen indicator */
  .gen-indicator {
    display: flex; align-items: center; gap: 10px; padding: 12px 16px;
    background: var(--ai-bub); border-radius: var(--radius); border-bottom-left-radius: 4px;
    font-size: 14px; color: var(--muted); width: fit-content;
    opacity: 0; animation: bPop .22s ease forwards;
    border: 1px solid var(--border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
  .gen-spinner {
    width: 13px; height: 13px; border-radius: 50%;
    border: 1.5px solid var(--border); border-top-color: var(--fg);
    animation: spin .8s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  /* Image bubble */
  .img-bubble {
    background: var(--ai-bub); border: 1px solid var(--border);
    border-radius: var(--radius); border-bottom-left-radius: 4px;
    overflow: hidden; max-width: 340px;
    opacity: 0; animation: bPop .22s ease forwards;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
  .img-bubble img { width: 100%; display: block; cursor: pointer; }
  .img-caption {
    padding: 8px 14px; font-size: 12px; color: var(--muted);
    border-top: 1px solid var(--border); display: flex; align-items: center; gap: 6px;
  }
  .img-label { font-weight: 600; color: var(--fg); }

  /* EMPTY STATE */
  .empty-state { display: none; }
  .empty-state h2 { font-size: 42px; font-weight: 400; font-family: var(--font-display); letter-spacing: -.04em; line-height: 1.05; }
  .empty-state p  { font-size: 16px; color: var(--muted); line-height: 1.75; max-width: 460px; }
  .sug-row { display: flex; flex-wrap: wrap; gap: 8px; }
  .sug-chip {
    padding: 9px 14px; border-radius: 999px;
    border: 1px solid var(--nav-pill-border); background: var(--nav-pill-bg);
    font-size: 13px; color: var(--muted); cursor: pointer;
    font-family: var(--font); transition: border-color .15s, color .15s, transform .15s, background .15s;
  }
  .sug-chip:hover { border-color: var(--fg); color: var(--fg); transform: translateY(-1px); }

  /* INPUT */
  .input-area {
    padding: 12px 28px 24px;
    max-width: 760px; width: 100%;
    margin: 0 auto; align-self: stretch;
  }
  .composer-hero {
    display: none;
    width: min(860px, 100%);
  }
  .composer-kicker {
    display: none;
  }
  .composer-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 4vw, 42px);
    line-height: 1.03;
    letter-spacing: -.045em;
    font-weight: 400;
    color: var(--fg);
  }
  .main.composer-centered .composer-hero {
    display: block;
    width: min(720px, 100%);
  }
  .mode-row { display: flex; gap: 4px; margin-bottom: 8px; }
  .input-row {
    display: flex; align-items: flex-end; gap: 10px;
    border: 1px solid var(--border); border-radius: 32px;
    padding: 14px 14px 14px 18px; transition: border-color .15s, background .15s, box-shadow .15s, transform .15s;
    background: var(--nav-pill-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
  }
  .input-row:focus-within { border-color: var(--fg); background: var(--surface-strong); transform: translateY(-1px); }

  .input-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  textarea {
    flex: 1; width: 100%; display: block; resize: none; border: none; outline: none;
    background: transparent; color: var(--fg);
    font-size: 16px; font-family: var(--font);
    line-height: 1.6; max-height: 160px; scrollbar-width: none;
    text-align: left;
  }
  textarea::placeholder { color: var(--muted2); text-align: left; }
  textarea::-webkit-scrollbar { display: none; }

  .composer-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 38px;
    padding-top: 0;
  }

  .attach-trigger {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    align-self: flex-end;
    border-radius: 999px;
    border: 1px solid var(--nav-pill-border);
    background: var(--nav-pill-bg);
    color: var(--muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color .15s, color .15s, transform .15s;
  }
  .attach-trigger svg {
    width: 14px;
    height: 14px;
  }
  .attach-trigger:hover {
    border-color: var(--fg);
    color: var(--fg);
    transform: translateY(-1px);
  }

  .mobile-composer-menu-wrap {
    display: none;
    position: relative;
    flex-shrink: 0;
    align-self: flex-end;
  }
  .mobile-composer-trigger {
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid var(--nav-pill-border);
    background: var(--nav-pill-bg);
    color: var(--muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color .15s, color .15s, transform .15s, background .15s;
  }
  .mobile-composer-trigger:hover {
    border-color: var(--fg);
    color: var(--fg);
    transform: translateY(-1px);
  }
  .mobile-composer-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--nav-pill-bg);
    border: 1px solid var(--nav-pill-border);
    border-radius: 18px;
    padding: 8px;
    box-shadow: var(--shadow);
    min-width: 188px;
    z-index: 1000;
    display: none;
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
  }
  .mobile-composer-menu.open {
    display: block;
  }
  .mobile-composer-item {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-family: var(--font);
    color: var(--fg);
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    transition: background .1s, color .1s;
  }
  .mobile-composer-item:hover {
    background: var(--surface);
  }
  .mobile-composer-item.selected {
    background: var(--surface);
    color: var(--fg);
  }
  .mobile-composer-item-status {
    font-size: 11px;
    color: var(--muted2);
    text-transform: uppercase;
    letter-spacing: .08em;
  }

  .send-wrap { position: relative; align-self: flex-end; flex-shrink: 0; }
  .send-wrap .tip {
    position: absolute; bottom: calc(100% + 7px); right: 0;
    background: var(--nav-pill-bg); border: 1px solid var(--nav-pill-border);
    border-radius: 999px; padding: 8px 13px;
    font-size: 12px; color: var(--muted); white-space: nowrap;
    opacity: 0; pointer-events: none;
    transform: translateY(3px); transition: opacity .15s, transform .15s;
  }
  .send-wrap.unavailable:hover .tip { opacity: 1; transform: translateY(0); }
  .send-wrap.unavailable .send-btn { opacity: .25; cursor: not-allowed; }
  .send-wrap.unavailable .send-btn:hover { opacity: .25; transform: none; }

  .send-btn {
    width: 38px; height: 38px; border-radius: 50%;
    background: var(--fg); border: 1px solid transparent; color: var(--bg);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    transition: transform .1s, opacity .15s, box-shadow .15s;
    box-shadow: 0 16px 28px -20px rgba(0, 0, 0, 0.6);
  }
  .send-btn:hover { box-shadow: 0 18px 28px -18px rgba(0, 0, 0, 0.55); }
  .send-btn:active { transform: scale(.92); }
  .send-btn:disabled { opacity: .25; cursor: default; }




  /* ATTACH */
  .attach-btn {
    width: 29px; height: 29px; border-radius: 50%;
    background: none; border: 1px solid var(--border); color: var(--muted);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; align-self: center;
    transition: border-color .15s, color .15s;
  }
  .attach-btn:hover { border-color: var(--fg); color: var(--fg); }

  .image-preview-row {
    display: flex; flex-wrap: wrap; gap: 6px;
    padding: 6px 0 2px;
  }
  .image-preview-wrap {
    position: relative; width: 62px; height: 62px; flex-shrink: 0;
  }
  .image-preview-wrap img {
    width: 62px; height: 62px; object-fit: cover;
    border-radius: 12px; border: 1px solid var(--border); display: block;
    box-shadow: var(--shadow);
  }
  .image-preview-remove {
    position: absolute; top: -5px; right: -5px;
    width: 18px; height: 18px; border-radius: 50%;
    background: var(--fg); color: var(--bg); border: none;
    font-size: 10px; cursor: pointer; line-height: 1;
    display: flex; align-items: center; justify-content: center;
  }

  /* Attached image inside a bubble */
  .bubble-img {
    display: block; max-width: 280px; border-radius: 14px;
    margin-bottom: 10px; border: 1px solid rgba(255,255,255,.15);
  }
  .user-bubble .bubble-img { border-color: rgba(255,255,255,.2); }
  .ai-bubble .bubble-img { border-color: var(--border); }


  /* MODE DROPDOWN */
  .mode-wrap {
    position: relative; flex-shrink: 0;
  }
  .mode-trigger {
    display: flex; align-items: center; gap: 4px;
    min-height: 36px;
    padding: 0 14px; border-radius: 999px;
    border: 1px solid var(--nav-pill-border); background: var(--nav-pill-bg);
    font-size: 13px; color: var(--muted); cursor: pointer;
    font-family: var(--font); transition: all .15s;
    white-space: nowrap;
  }
  .mode-trigger:hover { border-color: var(--fg); color: var(--fg); transform: translateY(-1px); }
  .mode-trigger svg { transition: transform .2s; }
  .mode-trigger.open svg { transform: rotate(180deg); }

  .mode-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--nav-pill-bg); border: 1px solid var(--nav-pill-border);
    border-radius: 18px; padding: 8px;
    box-shadow: var(--shadow);
    min-width: 150px; z-index: 1000;
    display: none;
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
  }
  .main:not(.composer-centered) .mode-dropdown {
    top: auto;
    bottom: calc(100% + 8px);
  }
  .mode-dropdown.open { display: block; }
  .mode-option {
    width: 100%; padding: 10px 12px; border-radius: 10px;
    background: none; border: none; cursor: pointer;
    font-size: 14px; font-family: var(--font);
    color: var(--fg); text-align: left;
    display: flex; align-items: center; gap: 8px;
    transition: background .1s;
  }
  .mode-option:hover { background: var(--surface); }
  .mode-option.selected { font-weight: 600; }
  .mode-option .opt-dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--muted2); flex-shrink: 0; transition: background .15s;
  }
  .mode-option.selected .opt-dot { background: var(--fg); }

  /* THINKING DROPDOWN inside input */
  .thinking-wrap {
    position: relative; align-self: center; flex-shrink: 0;
  }
  .thinking-trigger {
    display: flex; align-items: center; gap: 4px;
    padding: 8px 14px; border-radius: 999px;
    border: 1px solid var(--nav-pill-border); background: var(--nav-pill-bg);
    font-size: 13px; color: var(--muted); cursor: pointer;
    font-family: var(--font); transition: all .15s;
    white-space: nowrap;
  }
  .thinking-trigger:hover { border-color: var(--fg); color: var(--fg); transform: translateY(-1px); }
  .thinking-trigger.active { border-color: var(--fg); color: var(--fg); background: var(--surface); }
  .thinking-trigger svg { transition: transform .2s; }
  .thinking-trigger.open svg { transform: rotate(180deg); }

  .thinking-dropdown {
    position: fixed;
    background: var(--nav-pill-bg); border: 1px solid var(--nav-pill-border);
    border-radius: 18px; padding: 8px;
    box-shadow: var(--shadow);
    min-width: 160px; z-index: 1000;
    display: none;
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
  }
  .thinking-dropdown.open { display: block; }

  .thinking-option {
    width: 100%; padding: 10px 12px; border-radius: 10px;
    background: none; border: none; cursor: pointer;
    font-size: 14px; font-family: var(--font);
    color: var(--fg); text-align: left;
    display: flex; align-items: center; gap: 8px;
    transition: background .1s;
  }
  .thinking-option:hover { background: var(--surface); }
  .thinking-option.selected { font-weight: 600; }
  .thinking-option .opt-dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--muted2); flex-shrink: 0;
  }
  .thinking-option.selected .opt-dot { background: var(--fg); }
  .thinking-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    border: 1px solid var(--nav-pill-border);
    background: var(--nav-pill-bg);
    color: var(--muted);
    font-size: 13px;
    font-family: var(--font);
    cursor: pointer;
    transition: border-color .15s, color .15s, background .15s, transform .15s;
  }
  .thinking-toggle:hover {
    border-color: var(--fg);
    color: var(--fg);
    transform: translateY(-1px);
  }
  .thinking-toggle.active {
    color: var(--fg);
    border-color: var(--fg);
    background: var(--surface);
  }
  .thinking-indicator {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: transparent;
    box-shadow: inset 0 0 0 1px var(--muted2);
    transition: background .15s, box-shadow .15s;
  }
  .thinking-toggle.active .thinking-indicator {
    background: var(--fg);
    box-shadow: 0 0 0 3px rgba(127,127,127,.12);
  }

  /* HISTORY CONTEXT MENU */
  .history-menu {
    position: absolute; right: 8px; top: 50%;
    transform: translateY(-50%);
    width: 28px; height: 28px;
    display: grid; place-items: center;
    z-index: 50; pointer-events: all;
  }
  .history-menu-btn {
    width: 28px; height: 28px; border-radius: 8px;
    background: none; border: none; cursor: pointer;
    color: var(--muted); font-size: 16px; line-height: 1;
    display: grid; place-items: center;
    opacity: 0; transition: opacity .1s, color .1s;
    font-family: var(--font);
    text-align: center;
    padding: 0;
  }
  .history-menu-btn svg {
    display: block;
    width: 14px;
    height: 14px;
    flex: none;
  }
  .history-item:hover .history-menu-btn { opacity: 1; }
  .history-menu-btn:hover { color: var(--fg); }
  .history-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--surface-strong); border: 1px solid var(--border);
    border-radius: 16px; padding: 8px;
    box-shadow: var(--shadow);
    min-width: 110px; z-index: 1000;
    display: none;
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
  }
  .history-menu-dropdown.open { display: block; }
  .history-menu-item {
    width: 100%; padding: 10px 12px; border-radius: 10px;
    background: none; border: none; cursor: pointer;
    font-size: 14px; font-family: var(--font);
    color: var(--fg); text-align: left;
    transition: background .1s;
    display: block;
  }
  .history-menu-item:hover { background: var(--surface); }
  .history-menu-item.danger { color: #ef4444; }
  .history-menu-item.danger:hover { background: rgba(239,68,68,.08); }

  /* TOAST */
  .toast {
    position: fixed; bottom: 60px; left: 50%; transform: translateX(-50%);
    background: var(--surface-strong); color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 999px; padding: 10px 16px;
    font-size: 13px; opacity: 0; pointer-events: none;
    transition: opacity .2s; z-index: 999; white-space: nowrap;
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
  }
  .toast.show { opacity: 1; }

  @media (max-width: 768px) {
    html,
    body,
    .app,
    .main {
      min-height: 100dvh;
      background: var(--bg);
    }

    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      height: 100dvh;
      width: min(86vw, 320px);
      max-width: 320px;
      padding-top: var(--safe-top);
      padding-bottom: var(--safe-bottom);
      transform: translateX(-100%);
      transition: transform .25s cubic-bezier(.4,0,.2,1);
      z-index: 30;
      border-right: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .sidebar.closed {
      width: min(86vw, 320px);
      border-right: 1px solid var(--border);
    }

    .history-list {
      padding-bottom: 16px;
    }

    .sidebar-footer {
      position: sticky;
      bottom: 0;
      z-index: 1;
      padding-bottom: calc(14px + var(--safe-bottom) + 14px);
      background: linear-gradient(180deg, rgba(11, 13, 52, 0.82), rgba(11, 13, 52, 0.96));
      backdrop-filter: blur(22px);
      -webkit-backdrop-filter: blur(22px);
    }

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

    .app.mobile-sidebar-open .sidebar-backdrop {
      opacity: 1;
      pointer-events: auto;
    }

    .main {
      width: 100%;
      padding-top: var(--safe-top);
      padding-bottom: var(--safe-bottom);
    }

    .sidebar-toggle {
      position: fixed;
      top: calc(var(--safe-top) + 12px);
      left: 14px;
      z-index: 40;
      transition: left .25s cubic-bezier(.4,0,.2,1), border-color .15s, color .15s, transform .15s, background .15s;
    }

    .app.mobile-sidebar-open .sidebar-toggle {
      left: calc(min(86vw, 320px) - 52px);
      background: var(--surface-strong);
      border-color: var(--nav-pill-border);
    }

    .app.mobile-sidebar-open .sidebar-toggle svg {
      transform: rotate(180deg);
    }

    .messages {
      padding-top: 74px;
    }

    .bubble-group,
    .empty-state,
    .input-area {
      padding-left: calc(20px + var(--safe-left));
      padding-right: calc(20px + var(--safe-right));
    }

    .bubble-row {
      max-width: 100%;
    }

    .composer-title {
      font-size: clamp(26px, 7.5vw, 34px);
      line-height: .98;
    }

    .input-row {
      gap: 8px;
      border-radius: 24px;
      padding: 8px 10px;
      align-items: center;
    }

    .mobile-composer-trigger,
    .send-btn {
      width: 30px;
      height: 30px;
    }

    .attach-trigger,
    .composer-controls {
      display: none;
    }

    .mobile-composer-menu-wrap {
      display: block;
      align-self: center;
    }

    .input-main {
      gap: 0;
      justify-content: center;
    }

    .image-preview-row {
      padding: 0;
    }

    textarea {
      font-size: 15px;
      line-height: 1.2;
    }

    .main.composer-centered .input-area {
      padding: calc(var(--safe-top) + 24px) calc(20px + var(--safe-right)) calc(var(--safe-bottom) + 18px) calc(20px + var(--safe-left));
      gap: 12px;
    }

    .main.composer-centered .composer-hero {
      width: 100%;
      padding-left: 10px;
      padding-right: 10px;
    }

    .main.composer-centered .input-row {
      display: flex;
      grid-template-columns: none;
      grid-template-rows: none;
      grid-template-areas: none;
      column-gap: 0;
      row-gap: 0;
      align-items: center;
      width: 100%;
      min-height: 0;
      border-radius: 22px;
      padding: 7px 10px;
    }

    .main.composer-centered .input-main {
      display: flex;
      flex: 1;
      min-width: 0;
      gap: 0;
    }

    .main.composer-centered .image-preview-row {
      grid-area: auto;
    }

    .main.composer-centered textarea {
      grid-area: auto;
      min-height: 18px;
      max-height: 72px;
      font-size: 15px;
      line-height: 1.15;
      padding: 0 4px;
    }

    .main.composer-centered .send-wrap {
      grid-area: auto;
      align-self: center;
    }
  }