/* ═══════════════════════════════════════════════════════════════════
   FiveCat WebAgentUI — Design System
   主题色与 zahnee.cn 首页一致
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --bg-base:      #050816;
  --bg-2:         #0b1023;
  --bg-3:         #0f1629;
  --bg-card:      rgba(255,255,255,.05);
  --bg-card-hover:rgba(255,255,255,.08);
  --bg-input:     rgba(255,255,255,.04);

  --border:       rgba(255,255,255,.10);
  --border-focus: rgba(96,165,250,.5);

  --text:         #eef2ff;
  --text-2:       #94a3b8;
  --text-3:       #475569;

  --blue:         #60a5fa;
  --cyan:         #22d3ee;
  --purple:       #a78bfa;
  --green:        #34d399;
  --red:          #f87171;

  --accent-gradient: linear-gradient(92deg,#e0f2fe 0%,#93c5fd 28%,#67e8f9 55%,#c4b5fd 100%);
  --btn-gradient:    linear-gradient(135deg,rgba(59,130,246,.96),rgba(34,211,238,.92) 52%,rgba(167,139,250,.92));

  --sidebar-w:    260px;
  --sidebar-collapsed-w: 56px;
  --header-h:     52px;
  --radius:       14px;
  --radius-sm:    10px;
  --radius-xs:    7px;

  --transition:   .18s ease;
}

/* ── Reset & Base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 15px;
  color: var(--text);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
}

/* ── App shell ────────────────────────────────────────────────── */
.app {
  display: flex;
  height: 100dvh;
  max-height: 100dvh;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(96,165,250,.12), transparent 30%),
    radial-gradient(circle at 82% 28%, rgba(34,211,238,.08), transparent 28%),
    radial-gradient(circle at 55% 78%, rgba(167,139,250,.08), transparent 24%),
    linear-gradient(180deg, #040612 0%, #060916 30%, #0a1020 100%);
}

/* ── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: rgba(5,8,22,.72);
  border-right: 1px solid var(--border);
  backdrop-filter: blur(20px);
  transition: width var(--transition);
  overflow: hidden;
}

.sidebar.collapsed { width: var(--sidebar-collapsed-w); }

/* Sidebar header */
.sidebar-header {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  background: rgba(96,165,250,.10);
  border: 1px solid rgba(96,165,250,.22);
  color: #93c5fd;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  white-space: nowrap;
  overflow: hidden;
}
.new-chat-btn:hover { background: rgba(96,165,250,.18); border-color: rgba(96,165,250,.4); }
.new-chat-btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.sidebar-search {
  position: relative;
  overflow: hidden;
  transition: opacity var(--transition);
}
.sidebar.collapsed .sidebar-search { opacity: 0; pointer-events: none; }

.sidebar-search-icon {
  position: absolute;
  left: 10px; top: 50%;
  transform: translateY(-50%);
  width: 14px; height: 14px;
  color: var(--text-3);
}

.sidebar-search input {
  width: 100%;
  padding: 8px 10px 8px 32px;
  border-radius: var(--radius-xs);
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition);
}
.sidebar-search input:focus { border-color: var(--border-focus); }
.sidebar-search input::placeholder { color: var(--text-3); }

/* Chat list */
.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.08) transparent;
}
.chat-list::-webkit-scrollbar { width: 4px; }
.chat-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 2px; }

.chat-item {
  position: relative;
  display: flex;
  align-items: center;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
  margin-bottom: 2px;
}
.chat-item:hover { background: var(--bg-card-hover); }
.chat-item.active {
  background: rgba(96,165,250,.12);
  border: 1px solid rgba(96,165,250,.18);
}

.chat-item-icon {
  font-size: 14px;
  flex-shrink: 0;
  margin-right: 8px;
  opacity: .6;
}

.chat-item-title {
  font-size: 13px;
  color: var(--text-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  padding-right: 20px;
}
.chat-item.active .chat-item-title { color: var(--text); }

.chat-item-delete {
  position: absolute; right: 6px; top: 50%;
  transform: translateY(-50%);
  display: none;
  background: none; border: none;
  color: var(--text-3); font-size: 15px;
  cursor: pointer; padding: 2px 5px;
  border-radius: 4px; line-height: 1;
  transition: color var(--transition);
}
.chat-item:hover .chat-item-delete { display: block; }
.chat-item-delete:hover { color: var(--red); }

.sidebar.collapsed .chat-item-title,
.sidebar.collapsed .chat-item-icon { display: none; }
.sidebar.collapsed .chat-item { justify-content: center; padding: 8px; }

/* Sidebar footer */
.sidebar-footer {
  flex-shrink: 0;
  padding: 8px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-footer-btn:hover {
  background: var(--bg-card);
  border-color: var(--border);
  color: var(--text);
}
.sidebar-footer-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.sidebar-footer-btn.files { color: var(--cyan); border-color: rgba(34,211,238,.15); background: rgba(34,211,238,.05); }
.sidebar-footer-btn.files:hover { background: rgba(34,211,238,.12); border-color: rgba(34,211,238,.3); }

.sidebar.collapsed .sidebar-footer-btn span,
.sidebar.collapsed .sidebar-footer-btn .btn-text { display: none; }
.sidebar.collapsed .sidebar-footer-btn { justify-content: center; padding: 9px 0; }

/* User info row */
.user-row {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  overflow: hidden;
}
.user-avatar {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(96,165,250,.5), rgba(167,139,250,.5));
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: var(--text);
  flex-shrink: 0;
}
.user-name {
  flex: 1;
  font-size: 13px; font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.user-logout {
  background: none; border: none;
  color: var(--text-3); cursor: pointer;
  font-size: 16px; padding: 2px 4px;
  border-radius: 4px; flex-shrink: 0;
  transition: color var(--transition);
}
.user-logout:hover { color: var(--red); }

.sidebar.collapsed .user-row { justify-content: center; padding: 8px 0; }
.sidebar.collapsed .user-name,
.sidebar.collapsed .user-logout { display: none; }

/* Collapse btn */
.collapse-btn {
  display: flex; align-items: center; justify-content: center;
  width: 100%; padding: 6px;
  background: none; border: none;
  color: var(--text-3); cursor: pointer;
  border-radius: var(--radius-xs);
  transition: color var(--transition), background var(--transition);
}
.collapse-btn:hover { color: var(--text-2); background: var(--bg-card); }
.collapse-btn svg { width: 16px; height: 16px; }
.sidebar.collapsed .collapse-btn svg { transform: scaleX(-1); }

/* Mobile */
.mobile-close-btn { display: none; }
.sidebar-overlay { display: none; }

/* ── Main area ────────────────────────────────────────────────── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100%;
  overflow: hidden;
}

/* ── Header ───────────────────────────────────────────────────── */
.header {
  height: var(--header-h);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(5,8,22,.6);
  backdrop-filter: blur(12px);
}

.menu-btn {
  display: none;
  background: none; border: none;
  color: var(--text-2); cursor: pointer;
  padding: 6px; border-radius: 8px;
}
.menu-btn svg { width: 20px; height: 20px; }

.title {
  font-size: 15px;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: .02em;
}

.header-spacer { flex: 1; }

.chat-model {
  font-size: 11px;
  color: var(--text-3);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 20px;
  white-space: nowrap;
  overflow: hidden;
  max-width: 180px;
  text-overflow: ellipsis;
}

.status {
  font-size: 12px;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 5px;
}
.status::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-3);
  flex-shrink: 0;
}
.status.streaming::before { background: var(--cyan); animation: pulse 1s ease infinite; }
.status.ready::before { background: var(--green); }

@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }

/* ── Chat area ────────────────────────────────────────────────── */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.08) transparent;
}
.messages::-webkit-scrollbar { width: 6px; }
.messages::-webkit-scrollbar-track { background: transparent; }
.messages::-webkit-scrollbar-thumb { background: rgba(148,163,184,.25); border-radius: 3px; transition: background .2s; }
.messages::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,.55); }
.messages { scrollbar-width: thin; scrollbar-color: rgba(148,163,184,.25) transparent; }

/* Messages */
.message {
  max-width: 760px;
  margin: 0 auto 20px;
  padding: 0 20px;
  display: flex;
  gap: 12px;
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from{opacity:0;transform:translateY(6px)} to{opacity:1;transform:none} }

.message.user { flex-direction: row-reverse; }

.msg-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700;
  margin-top: 2px;
}
.message.user .msg-avatar {
  background: linear-gradient(135deg, rgba(96,165,250,.4), rgba(167,139,250,.4));
  color: var(--text);
}
.message.assistant .msg-avatar {
  background: linear-gradient(135deg, rgba(34,211,238,.2), rgba(96,165,250,.2));
  border: 1px solid rgba(34,211,238,.25);
  font-size: 16px;
}

.msg-body { flex: 1; min-width: 0; }

.msg-bubble {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 16px;
  line-height: 1.65;
  font-size: 14px;
  max-width: 100%;
  word-break: break-word;
}
.message.user .msg-bubble {
  background: rgba(96,165,250,.15);
  border: 1px solid rgba(96,165,250,.25);
  color: var(--text);
  border-bottom-right-radius: 4px;
}
.message.assistant .msg-bubble {
  background: transparent;
  color: var(--text);
  padding: 4px 0;
}

/* Markdown inside assistant */
.msg-bubble h1,.msg-bubble h2,.msg-bubble h3 { font-weight: 700; margin: 14px 0 6px; color: var(--text); }
.msg-bubble h1 { font-size: 18px; }
.msg-bubble h2 { font-size: 16px; }
.msg-bubble h3 { font-size: 14px; }
.msg-bubble p { margin: 0 0 10px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble ul,.msg-bubble ol { padding-left: 20px; margin: 8px 0; }
.msg-bubble li { margin-bottom: 4px; }
.msg-bubble code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.1);
  padding: 1px 5px; border-radius: 4px;
  color: var(--cyan);
}
.msg-bubble pre {
  background: rgba(0,0,0,.4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  overflow-x: auto;
  margin: 10px 0;
  position: relative;
}
.msg-bubble pre code {
  background: none; border: none; padding: 0;
  font-size: 13px; color: var(--text-2);
}
.msg-bubble strong { color: var(--text); font-weight: 600; }
.msg-bubble em { color: var(--text-2); }
.msg-bubble hr { border: none; border-top: 1px solid var(--border); margin: 12px 0; }
.msg-bubble blockquote {
  border-left: 3px solid var(--blue);
  padding-left: 12px; margin: 8px 0;
  color: var(--text-2);
}
.msg-bubble table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 13px; }
.msg-bubble th,.msg-bubble td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.msg-bubble th { background: rgba(255,255,255,.05); font-weight: 600; }

/* Typing cursor */
.cursor { animation: blink 1s step-end infinite; color: var(--cyan); }
@keyframes blink { 0%,100%{opacity:1}50%{opacity:0} }

/* ── Input area ───────────────────────────────────────────────── */
.input-area {
  flex-shrink: 0;
  padding: 0 16px 20px;
  padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}

/* Agent selector */
.agent-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 2px;
  margin-bottom: 8px;
  position: relative;
}

.agent-chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; border-radius: 20px;
  background: rgba(96,165,250,.08);
  border: 1px solid rgba(96,165,250,.18);
  color: #93c5fd; font-size: 12px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  user-select: none;
}
.agent-chip:hover { background: rgba(96,165,250,.16); border-color: rgba(96,165,250,.35); }
.agent-chip-emoji { font-size: 14px; }

.agent-bar-hint { font-size: 11px; color: var(--text-3); }

.agent-dropdown {
  position: absolute; bottom: calc(100% + 6px); left: 0;
  background: #0f1629;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 6px; z-index: 100;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
  min-width: 220px; display: none;
}
.agent-dropdown.open { display: block; }
.agent-option {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  cursor: pointer; transition: background var(--transition);
}
.agent-option:hover { background: var(--bg-card-hover); }
.agent-option.active { background: rgba(96,165,250,.10); }
.agent-option-emoji { font-size: 20px; }
.agent-option-info { flex: 1; }
.agent-option-name { font-size: 13px; font-weight: 600; color: var(--text); }
.agent-option-desc { font-size: 11px; color: var(--text-3); margin-top: 1px; }
.agent-option-badge {
  font-size: 10px; color: var(--text-3);
  background: rgba(255,255,255,.06);
  padding: 2px 6px; border-radius: 6px;
}

/* Input container */
.input-container {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-container:focus-within {
  border-color: rgba(96,165,250,.45);
  box-shadow: 0 0 0 3px rgba(96,165,250,.08);
}

/* File attach preview */
.attach-preview {
  max-width: 800px;
  margin: 0 auto 8px;
  padding: 8px 12px;
  background: rgba(34,211,238,.06);
  border: 1px solid rgba(34,211,238,.18);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--cyan);
}

.attach-btn {
  background: transparent; border: none;
  color: var(--text-3); cursor: pointer;
  padding: 8px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition); flex-shrink: 0;
}
.attach-btn:hover { background: var(--bg-card-hover); color: var(--text-2); }
.attach-btn svg { width: 18px; height: 18px; }

#messageInput {
  flex: 1;
  background: transparent; border: none;
  color: var(--text);
  font-size: 14px; line-height: 1.6;
  resize: none;
  max-height: 200px;
  min-height: 22px;
  outline: none;
  font-family: inherit;
}
#messageInput::placeholder { color: var(--text-3); }

.send-btn, .stop-btn {
  background: var(--btn-gradient);
  border: none; border-radius: 10px;
  color: white; cursor: pointer;
  width: 44px; height: 44px;
  padding: 0;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: opacity var(--transition), transform var(--transition);
}
.send-btn:hover { opacity: .88; transform: scale(1.04); }
.send-btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.stop-btn { background: rgba(248,113,113,.2); border: 1px solid rgba(248,113,113,.3); }
.stop-btn:hover { background: rgba(248,113,113,.3); }
.send-btn svg, .stop-btn svg { width: 16px; height: 16px; }

/* ── Files panel ──────────────────────────────────────────────── */
.files-panel {
  position: fixed; inset: 0; z-index: 200;
  background: var(--bg-2);
  display: none; flex-direction: column;
}
.files-panel.open { display: flex; }

.files-panel-header {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(5,8,22,.8);
  backdrop-filter: blur(12px);
  flex-shrink: 0;
}
.files-panel-header h2 { font-size: 15px; font-weight: 700; flex: 1; }
.files-close-btn {
  background: none; border: none;
  color: var(--text-2); font-size: 18px;
  cursor: pointer; padding: 4px 10px;
  border-radius: var(--radius-xs);
  transition: color var(--transition);
}
.files-close-btn:hover { color: var(--text); }

.files-upload-btn {
  padding: 7px 14px;
  background: rgba(96,165,250,.12);
  border: 1px solid rgba(96,165,250,.25);
  border-radius: var(--radius-sm);
  color: #93c5fd; font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
}
.files-upload-btn:hover { background: rgba(96,165,250,.2); }

.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px; padding: 16px;
  overflow-y: auto; flex: 1;
}
.file-card {
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  overflow: hidden; cursor: pointer;
  transition: all var(--transition);
}
.file-card:hover { border-color: rgba(96,165,250,.3); transform: translateY(-2px); }
.file-thumb { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
.file-icon { width: 100%; aspect-ratio: 1; display: flex; align-items: center; justify-content: center; font-size: 36px; }
.file-name { padding: 8px; font-size: 12px; color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.files-empty { color: var(--text-3); padding: 60px; text-align: center; width: 100%; font-size: 14px; }

/* ── Auth gate ────────────────────────────────────────────────── */
#authGate {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(circle at 15% 20%, rgba(96,165,250,.15), transparent 30%),
    radial-gradient(circle at 82% 28%, rgba(34,211,238,.10), transparent 28%),
    radial-gradient(circle at 55% 78%, rgba(167,139,250,.10), transparent 24%),
    #050816;
}
#authGate.hidden { display: none !important; }

.auth-card {
  width: min(420px, calc(100% - 32px));
  padding: 36px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.10);
  backdrop-filter: blur(24px);
  box-shadow: 0 24px 80px rgba(0,0,0,.6);
}
.auth-logo { text-align: center; margin-bottom: 28px; }
.auth-logo h1 {
  font-size: 26px; font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin: 0;
}
.auth-logo p { color: var(--text-3); font-size: 13px; margin-top: 6px; }

.auth-tabs {
  display: flex; gap: 4px; margin-bottom: 22px;
  padding: 4px; border-radius: 12px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.07);
}
.auth-tab {
  flex: 1; padding: 8px; text-align: center;
  border-radius: 8px; font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  color: var(--text-3); background: transparent; border: none;
}
.auth-tab.active { background: rgba(96,165,250,.18); color: #93c5fd; }

.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form.hidden { display: none !important; }

.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-group label { font-size: 12px; color: var(--text-2); font-weight: 500; }
.form-group input {
  padding: 10px 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--text);
  font-size: 14px; outline: none;
  transition: border-color var(--transition);
}
.form-group input:focus { border-color: var(--border-focus); }
.form-group input::placeholder { color: var(--text-3); }

.sms-row { display: flex; gap: 8px; }
.sms-row input { flex: 1; }
.sms-btn {
  padding: 10px 13px; border-radius: var(--radius-sm);
  border: 1px solid rgba(96,165,250,.25);
  background: rgba(96,165,250,.08); color: #93c5fd;
  font-size: 12px; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: all var(--transition); min-width: 96px;
}
.sms-btn:disabled { opacity: .45; cursor: not-allowed; }
.sms-btn:not(:disabled):hover { background: rgba(96,165,250,.16); }

.auth-btn {
  width: 100%; padding: 12px; border: none;
  border-radius: var(--radius-sm);
  background: var(--btn-gradient);
  color: white; font-size: 14px; font-weight: 700;
  cursor: pointer; margin-top: 4px;
  transition: opacity var(--transition), transform var(--transition);
}
.auth-btn:hover { opacity: .9; transform: translateY(-1px); }
.auth-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.auth-error { color: var(--red); font-size: 12px; text-align: center; min-height: 16px; }
.auth-hint { font-size: 11px; color: var(--text-3); margin-top: 2px; }

/* ── Welcome screen ───────────────────────────────────────────── */
.welcome-screen {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  height: 100%; padding: 40px 20px;
  text-align: center;
}
.welcome-emoji { font-size: 52px; margin-bottom: 18px; }
.welcome-title {
  font-size: 24px; font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 8px;
}
.welcome-sub { font-size: 14px; color: var(--text-3); max-width: 400px; line-height: 1.7; margin-bottom: 28px; }
.hints-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 10px; max-width: 480px; width: 100%;
}
.hint-card {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  text-align: left; cursor: pointer;
  font-size: 13px; color: var(--text-2); line-height: 1.5;
  transition: all var(--transition);
}
.hint-card:hover {
  border-color: rgba(96,165,250,.3);
  background: rgba(96,165,250,.06);
  color: var(--text);
  transform: translateY(-2px);
}

/* ── Scrollbar global ─────────────────────────────────────────── */
* { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.08) transparent; }
*::-webkit-scrollbar { width: 4px; }
*::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 2px; }

/* ── Mobile ───────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed; inset-block: 0; left: 0;
    width: var(--sidebar-w) !important;
    z-index: 300;
    transform: translateX(-100%);
    transition: transform var(--transition);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay {
    display: none; position: fixed; inset: 0;
    z-index: 299; background: rgba(0,0,0,.5);
    backdrop-filter: blur(4px);
  }
  .sidebar-overlay.visible { display: block; }
  .menu-btn { display: flex !important; }
  .mobile-close-btn {
    display: flex; align-items: center; gap: 6px;
    background: none; border: none; color: var(--text-2);
    font-size: 13px; cursor: pointer; padding: 4px;
  }
  .mobile-close-btn svg { width: 18px; height: 18px; }
  .hints-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 28px 22px; }
}

@media (min-width: 769px) {
  .mobile-close-btn { display: none; }
}