/* CUMTER iOS-inspired UI. Scoped to feature pages; welcome is deliberately excluded. */
body.ios-app {
  color-scheme: light;
  --ios-ink: #28443f;
  --ios-secondary: #5e6f6b;
  --ios-accent: #416d78;
  --ios-tint: #e8f0f2;
  --ios-coral: #e77f69;
  /* Color roles: welcome's cream/coral + mist-blue controls. No per-card rainbow. */
  --ios-paper: #fff8ee;
  --ios-action: #b85845;
  --ios-action-hover: #a34d3c;
  --ios-action-soft: #fae3d9;
  --ios-surface: rgba(255,253,249,.9);
  --ios-line: rgba(62,86,87,.10);
  --ios-shadow: 0 6px 24px rgba(43,62,65,.045), 0 1px 3px rgba(43,62,65,.025);
  --primary: var(--ios-accent);
  --primary-2: var(--ios-accent);
  --primary-dark: #2e525b;
  --primary-light: var(--ios-tint);
  --bg: #f7f5f0;
  --card-bg: var(--ios-surface);
  --text: var(--ios-ink);
  --text-secondary: var(--ios-secondary);
  --border: var(--ios-line);
  --radius: 24px;
  --shadow: var(--ios-shadow);
  --glow: 0 12px 36px rgba(43,62,65,.09);
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  background-color: var(--bg);
  background-image: radial-gradient(ellipse at 7% 0, #fae9df 0, transparent 42%),
                    radial-gradient(ellipse at 100% 22%, #e4edf3 0, transparent 47%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.ios-app *, .ios-app *::before, .ios-app *::after { box-sizing: border-box; }
.ios-app button, .ios-app input, .ios-app textarea, .ios-app select { font-family: inherit; }
.ios-app a { color: var(--primary); text-decoration: none; }
.ios-app a:hover { text-decoration: none; }
.ios-app button { cursor: pointer; }
.ios-app button:disabled { cursor: not-allowed; opacity: .5; }
.ios-app :is(a,button,input,textarea,select,summary,[tabindex]):focus-visible {
  outline: 3px solid #416d78; outline-offset: 3px;
}
.ios-app [hidden] { display: none !important; }
.ios-skip { position: fixed; left: 16px; top: -90px; padding: 12px 20px; border-radius: 14px; background: #fff; z-index: 10000; }
.ios-skip:focus { top: 10px; }
.ios-app :is(.nav,.ios-nav) {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 72px; height: auto; padding: 10px max(24px, calc((100vw - 1120px)/2));
  background: rgba(255,250,243,.8);
  border: 0; border-bottom: 1px solid rgba(62,86,87,.07);
  backdrop-filter: blur(22px) saturate(135%);
  -webkit-backdrop-filter: blur(22px) saturate(135%);
}
.ios-app .nav::before { display: none; }
.ios-app .nav-brand {
  display: flex; align-items: center; gap: 12px; flex: none;
  font-size: 18px; font-weight: 750; letter-spacing: -.4px; color: var(--text);
  background: none; -webkit-text-fill-color: currentColor;
}
.ios-app .nav-brand small {
  display: inline; margin: 0; padding-left: 12px; border-left: 1px solid var(--ios-line);
  font-size: 11px; font-weight: 400; color: var(--text-secondary); -webkit-text-fill-color: currentColor; letter-spacing: 0;
}
.ios-app .nav-links { display: flex; align-items: center; gap: 6px; min-width: 0; }
.ios-app .nav-links a {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  padding: 9px 15px; border-radius: 999px; color: var(--text-secondary); font-size: 13px; white-space: nowrap;
  transition: background .18s;
}
.ios-app .nav-links a:hover { background: #e8f0f2; color: var(--primary); }
.ios-app .nav-links #loginLink { background: var(--ios-tint); color: var(--primary); font-weight: 600; padding-inline: 22px; }
.ios-app .nav-user { color: var(--primary); font-size: 13px; padding: 8px 10px; border-radius: 999px; }
.ios-app .container { max-width: 1120px; margin: 0 auto; padding: 28px 24px 48px; }
.ios-app .container.wide { max-width: 1200px; }
.ios-app .ios-symbol {
  display: block; width: 24px; height: 24px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round;
}
.ios-app .app-icon {
  width: 48px; height: 48px; border-radius: 15px;
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  background: var(--ios-tint); color: var(--primary);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.65);
}
.ios-app .icon-button {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; min-width: 44px; height: 44px; border: 0; border-radius: 50%;
  background: #f0f1ef; color: var(--text-secondary);
}
.ios-app .icon-button .ios-symbol { width: 19px; height: 19px; }
.ios-app :is(.card,.tree-panel,.reading-panel,.reading-wrap,.modal-content,.popup-box) {
  border: 1px solid rgba(255,255,255,.94); border-radius: var(--radius);
  background: var(--card-bg); box-shadow: var(--ios-shadow);
}
.ios-app .card { padding: 26px; }
.ios-app .card::after { display: none; }
.ios-app .card-title { color: var(--text); font-size: 18px; font-weight: 650; letter-spacing: -.3px; margin-bottom: 14px; }
.ios-app .btn, .ios-app .refresh {
  min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 19px; border: 1px solid transparent; border-radius: 13px;
  font-size: 14px; font-weight: 550; line-height: 1.4; transition: background .18s, opacity .18s;
}
.ios-app .btn-primary { background: var(--ios-action); color: #fff; box-shadow: none; }
.ios-app .btn-primary::before { display: none; }
.ios-app .btn-primary:hover { background: var(--ios-action-hover); box-shadow: none; transform: none; filter: none; }
.ios-app :is(.btn-outline,.btn-border,.refresh) { border: 1px solid var(--ios-line); background: rgba(255,255,255,.7); color: var(--primary); box-shadow: none; }
.ios-app :is(.btn-outline,.btn-border,.refresh):hover { background: var(--ios-tint); border-color: var(--ios-line); }
.ios-app .btn-sm { min-height: 36px; font-size: 12px; padding: 8px 12px; border-radius: 10px; }
.ios-app :is(input[type="text"],input[type="search"],input[type="password"],textarea,select) {
  color: var(--text); background: #f4f3f0; border: 1px solid transparent; border-radius: 13px;
  font-size: 14px; padding: 12px 14px; min-width: 0; box-shadow: none;
}
.ios-app :is(input,textarea,select)::placeholder { color: #5e6f6b; opacity: 1; }
.ios-app :is(input,textarea,select):focus { border-color: #7198a2; box-shadow: 0 0 0 3px rgba(65,109,120,.10); }
.ios-app input[type="checkbox"] { accent-color: var(--primary); }
.ios-app .form-info { color: var(--text-secondary); font-size: 14px; line-height: 1.75; }
.ios-app .form-disclaimer { color: var(--text-secondary); font-size: 12px; line-height: 1.7; }
.ios-app .empty-state, .ios-app .empty { color: var(--text-secondary); }
.ios-app .modal-overlay { background: rgba(34,51,54,.28); backdrop-filter: blur(7px); -webkit-backdrop-filter: blur(7px); }
.ios-app .modal-content { color: var(--text); padding: 28px; max-height: 88vh; max-height: 88dvh; box-shadow: 0 28px 90px rgba(37,58,62,.2); }
.ios-app .modal-content h2 { font-size: 21px; letter-spacing: -.5px; color: var(--text); background: none; -webkit-text-fill-color: currentColor; }
.ios-app .modal-content select option { background: #fffdfa; color: var(--text); }
.ios-app .toast { background: #395d66; color: #fff; box-shadow: 0 8px 24px rgba(37,58,62,.14); }
.ios-app .footer { color: var(--text-secondary); font-size: 11px; padding: 16px 20px 32px; line-height: 2; }
.ios-app .footer a { color: var(--text-secondary); font-weight: 400 !important; }
.ios-app .profile-popup { border-radius: 22px; border-color: var(--ios-line); box-shadow: 0 18px 60px rgba(37,58,62,.15); }
.ios-app .profile-popup .pp-head { background: var(--ios-tint); }
.ios-app .profile-popup .pp-avatar { background: var(--primary); border-radius: 14px; }
.ios-app .popup-overlay { background: rgba(34,51,54,.30); backdrop-filter: blur(7px); -webkit-backdrop-filter: blur(7px); }
.ios-app .popup-title { color: var(--text); }
.ios-app .popup-close { width: 44px; height: 44px; background: rgba(41,61,65,.6); }
.ios-app .popup-dismiss { min-height: 44px; color: var(--text-secondary); }
.ios-app .popup-box { box-shadow: 0 22px 80px rgba(37,58,62,.16); }
.ios-app .msg .bubble { font-size: 15px; line-height: 1.8; padding: 14px 18px; border-radius: 19px; }
.ios-app .msg.user .bubble { background: var(--primary); color: #fff; border: 0; border-bottom-right-radius: 6px; }
.ios-app .msg.bot .bubble { background: #edf2f3; color: var(--text); border: 0; border-bottom-left-radius: 6px; }
.ios-app .msg.bot .bubble a { color: var(--primary) !important; text-decoration: underline; }
.ios-app .fb-btn { min-height: 36px; padding: 7px 12px; background: #f4f3ee; border-color: var(--ios-line); }
.ios-app .ai-answer-footer, .ios-app .reading-meta { color: var(--text-secondary); }
@supports not (backdrop-filter: blur(1px)) {
  .ios-app :is(.nav,.ios-nav) { background: #fffaf3; }
}
@media(max-width:760px) {
  .ios-app :is(.nav,.ios-nav) { min-height: 64px; padding: 8px 16px; gap: 6px; }
  .ios-app .nav-brand { font-size: 17px; }
  .ios-app .nav-brand small { display: none; }
  .ios-app .nav-links { gap: 1px; }
  .ios-app .nav-links a { padding: 8px 10px; font-size: 12px; }
  .ios-app .nav-links #loginLink { padding-inline: 17px; }
  .ios-app .nav-user { max-width: 108px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
  .ios-app .container, .ios-app .container.wide { padding: 20px 16px 36px; }
  .ios-app .card { padding: 20px; border-radius: 22px; }
  .ios-app .btn-sm { min-height: 44px; }
  .ios-app :is(input[type="text"],input[type="search"],input[type="password"],textarea,select) { font-size: 16px; }
  .ios-app .modal-overlay { padding: 0; align-items: flex-end; }
  .ios-app .modal-content { width: 100%; max-width: 100% !important; border-radius: 26px 26px 0 0; padding: 28px 22px max(24px,env(safe-area-inset-bottom)); max-height: 92dvh; border-bottom: 0; }
  .ios-app .modal-content::before { content: ""; display: block; width: 36px; height: 5px; border-radius: 99px; background: #d5ddde; margin: -13px auto 22px; }
  .ios-app .profile-popup { top: 68px; }
}
@media(prefers-reduced-motion:reduce) {
  .ios-app *, .ios-app *::before, .ios-app *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}
@media(prefers-reduced-transparency:reduce) {
  .ios-app :is(.nav,.ios-nav) { backdrop-filter: none; -webkit-backdrop-filter: none; background: #fffaf3; }
  .ios-app { --ios-surface: #fffdfa; }
}