/* iPhone / PWA enhancement layer. Loaded after styles.css. */
:root{--mobile-nav-h:66px}
.pwa-mobile-nav,.pwa-tools-overlay,.mobile-panel-close{display:none}
.pwa-net-badge{display:inline-flex;align-items:center;gap:6px;font-size:11px;color:var(--muted)}
.pwa-net-dot{width:7px;height:7px;border-radius:50%;background:#16a34a}.pwa-net-badge.offline .pwa-net-dot{background:#d97706}

@media(max-width:760px){
  html{scroll-padding-bottom:calc(var(--mobile-nav-h) + env(safe-area-inset-bottom) + 12px)}
  body{padding-bottom:calc(var(--mobile-nav-h) + env(safe-area-inset-bottom));overscroll-behavior-y:contain;-webkit-tap-highlight-color:transparent}
  button,.btn,.chip,.icon-btn{touch-action:manipulation}
  input,select,textarea{font-size:16px!important}
  .topbar{padding:calc(10px + env(safe-area-inset-top)) 12px 10px!important;min-height:64px;box-shadow:0 5px 18px rgba(15,23,42,.05)}
  .brand{gap:10px}.brand h1{font-size:16px}.logo{width:38px;height:38px;border-radius:11px;font-size:13px}
  .main-tabs{display:none!important}
  .layout,.grammar-layout{padding:10px!important}
  .sidebar,.grammar-sidebar{margin-bottom:10px}
  .sidebar .stats,.grammar-sidebar .stats{margin-bottom:10px}
  .sidebar .panel:not(:nth-of-type(1)){display:none!important}
  .grammar-sidebar .panel:not(:nth-of-type(1)){display:none!important}
  .hint{display:none}
  .list-head h2{font-size:19px}.list-head p{font-size:12px}
  .word-list.card-view{grid-template-columns:1fr!important}
  .word-row{padding:12px 10px;gap:8px;grid-template-columns:28px minmax(0,1fr) 48px!important}
  .word-meaning{grid-column:2/4!important}.word-title strong{font-size:17px}
  .grammar-row{grid-template-columns:38px minmax(0,1fr) 30px;padding:12px;gap:9px}
  .detail-panel,.grammar-detail{position:fixed!important;inset:0!important;top:0!important;bottom:0!important;right:0!important;width:100%!important;max-height:none!important;border:0!important;border-radius:0!important;padding:calc(62px + env(safe-area-inset-top)) 14px calc(28px + env(safe-area-inset-bottom))!important;z-index:520!important;background:var(--panel)!important;box-shadow:none!important}
  .detail-panel.open,.grammar-detail.open{display:block!important}
  .mobile-panel-close{display:grid;place-items:center;position:fixed;right:12px;top:calc(10px + env(safe-area-inset-top));z-index:530;width:42px;height:42px;border-radius:13px;border:1px solid var(--line);background:var(--panel);color:var(--text);font-size:19px;box-shadow:0 6px 18px rgba(15,23,42,.12)}
  body.mobile-panel-open{overflow:hidden}
  .overlay{padding:0!important;z-index:600!important;background:rgba(15,23,42,.55)}
  .study-shell,.modal-shell{width:100%;max-width:none!important;min-height:100dvh!important;margin:0!important;border:0!important;border-radius:0!important;box-shadow:none!important}
  .study-header,.modal-head{position:sticky;top:0;z-index:5;background:var(--panel);padding:calc(12px + env(safe-area-inset-top)) 14px 12px!important;border-bottom:1px solid var(--line)}
  .study-body{padding:18px 14px calc(36px + env(safe-area-inset-bottom))!important}
  .learn-word{font-size:36px!important}.learn-zh{font-size:22px!important}
  .study-nav,.test-actions{gap:8px}.study-nav .btn,.test-actions .btn,.modal-actions .btn{min-height:46px}
  .finish-card{padding:32px 4px}.finish-card h2{font-size:25px}.finish-stats{flex-wrap:wrap}
  .pwa-mobile-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:480;min-height:var(--mobile-nav-h);padding:6px 5px calc(6px + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--panel) 94%,transparent);border-top:1px solid var(--line);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 -10px 30px rgba(15,23,42,.08)}
  .pwa-nav-btn{border:0;background:transparent;color:var(--muted);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;border-radius:11px;min-width:0;padding:4px 2px;font-weight:700;font-size:10px}
  .pwa-nav-btn .nav-icon{font-size:20px;line-height:1.05}.pwa-nav-btn.active{color:var(--primary);background:var(--primary2)}
  .pwa-nav-btn.study-action{color:#fff;background:var(--primary);margin:0 3px}
  .pwa-tools-overlay{position:fixed;inset:0;z-index:700;background:rgba(15,23,42,.5);align-items:flex-end;padding:0}
  .pwa-tools-overlay.open{display:flex}
  .pwa-tools-sheet{width:100%;max-height:min(86dvh,760px);overflow:auto;background:var(--panel);border-radius:22px 22px 0 0;padding:16px 16px calc(20px + env(safe-area-inset-bottom));box-shadow:0 -20px 60px rgba(15,23,42,.22)}
  .pwa-tools-handle{width:44px;height:5px;border-radius:999px;background:var(--line);margin:0 auto 13px}
  .pwa-tools-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}.pwa-tools-head h2{font-size:20px;margin:0}.pwa-close-tools{border:1px solid var(--line);background:var(--panel);color:var(--text);width:38px;height:38px;border-radius:11px;font-size:18px}
  .pwa-tools-section{border-top:1px solid var(--line);padding-top:14px;margin-top:14px}.pwa-tools-section:first-of-type{border-top:0;margin-top:0;padding-top:0}.pwa-tools-section h3{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:0 0 8px}.pwa-tools-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.pwa-tools-grid .btn{min-height:46px}.pwa-tools-grid .wide{grid-column:1/-1}.pwa-help{font-size:13px;color:var(--muted);line-height:1.7;margin:0}.pwa-help b{color:var(--text)}
  .pwa-install-card{background:var(--primary2);border:1px solid color-mix(in srgb,var(--primary) 25%,var(--line));border-radius:14px;padding:12px}.pwa-install-state{font-weight:800;color:var(--primary);margin-bottom:5px}
  footer{padding-left:12px;padding-right:12px}
}
@media(display-mode:standalone) and (max-width:760px){
  .topbar{padding-top:calc(8px + env(safe-area-inset-top))!important}
}