.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 16px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: transparent; text-decoration: none; color: var(--text); font-size: 14px; line-height: 1.5; }
.button.primary { background: var(--accent); border-color: var(--accent); color: var(--bg-deep); font-weight: 600; }
.button.danger { color: var(--accent); }
.button.ghost { border-color: transparent; }
.icon-button { display: inline-flex; align-items: center; justify-content: center; width: 44px; min-width: 44px; height: 44px; padding: 0; border-radius: var(--radius-sm); color: var(--text-secondary); }
.icon-button[aria-pressed="true"] { color: var(--accent); }
.field { margin-bottom: 23px; }
.field>label,.field>span { font-size: 14px; display: block; margin-bottom: 8px; font-weight: 550; }
.field .hint { font-size: 12px; color: var(--text-muted); margin: 7px 0 0; }
.password-wrap { position: relative; }
.password-wrap input { padding-right: 50px; }
.password-wrap .icon-button { position: absolute; right: 2px; top: 1px; }
.checkbox-label { display: flex; align-items: center; min-height: 44px; gap: 12px; cursor: pointer; font-size: 14px; }
.trace { position: relative; }
.trace::after { content: ''; position: absolute; pointer-events: none; left: 12%; right: 12%; bottom: -1px; height: 1px; background: linear-gradient(90deg,transparent,var(--accent-72),transparent); opacity: 0; transform: scaleX(.28); transition: opacity var(--duration-base) var(--ease-out),transform var(--duration-base) var(--ease-out); }
.trace:focus-within::after,.trace[data-active="true"]::after { opacity: 1; transform: scaleX(1); }
dialog { color: var(--text); background: var(--bg-soft); border: none; padding: 0; width: min(520px,calc(100vw - 40px)); max-height: min(86dvh,800px); border-radius: var(--radius-lg); box-shadow: var(--shadow-panel); overflow: hidden; }
dialog[open] { display: flex; flex-direction: column; }
dialog::backdrop { background: var(--backdrop); }
.dialog-head { padding: 20px 20px 12px; flex-shrink: 0; display: flex; align-items: center; gap: 8px; }
.dialog-head h2 { margin: 0; font-size: 18px; flex: 1; }
.dialog-body { padding: 8px 24px 24px; overflow-y: auto; min-height: 0; }
.dialog-foot { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; padding: 16px 24px 24px; }
dialog.model-picker { width: 400px; margin: 0; position: fixed; top: 68px; left: min(302px,calc(100vw - 420px)); max-height: 65dvh; }
.model-picker .dialog-body { padding: 0 14px 16px; }
.picker-search { padding: 0 6px 12px; position: sticky; top: 0; background: var(--bg-soft); z-index: 1; }
.picker-group { padding: 10px 10px 4px; font-size: 12px; color: var(--text-muted); }
.picker-row { display: flex; align-items: center; border-radius: var(--radius-sm); }
.picker-row.selected { background: var(--accent-08); }
.picker-row.selected .model-pick { color: var(--accent); }
.model-pick { min-width: 0; flex: 1; text-align: left; padding: 11px 10px; display: flex; align-items: center; gap: 8px; }
.model-pick .model-name { display: block; font-size: 14px; }
.model-pick small { display: block; }
.model-symbol { width: 29px; height: 34px; display: grid; place-items: center; color: var(--text-muted); flex-shrink: 0; }
.model-symbol .icon { width: 19px; height: 19px; }
.picker-row.selected .model-symbol { color: var(--accent); }
.model-picker .dialog-head { padding: 17px 18px 6px 23px; }
.model-picker .dialog-head h2 { font-size: 14px; font-weight: 550; color: var(--text-secondary); }
.model-picker .picker-search { padding: 0 6px 8px; background: transparent; }
.model-picker .picker-search input { background: transparent; border: none; box-shadow: none; min-height: 52px; padding-left: 34px; font-size: 16px; }
.model-picker .search-wrap>.icon { top: 18px; left: 6px; color: var(--text-secondary); }
.picker-list { border-top: 1px solid var(--line-faint); padding: 6px 0 12px; }
.picker-group { display: flex; align-items: center; gap: 12px; padding-top: 13px; padding-bottom: 7px; }
.picker-group::after { content: ''; height: 1px; flex: 1; background: var(--line-faint); }
.picker-row { position: relative; }
.picker-row.selected { background: var(--accent-08); }
.picker-row.selected::before { content: ''; position: absolute; left: 0; width: 2px; height: 20px; background: var(--accent); border-radius: 1px; }
.picker-row.selected .model-pick { color: var(--text); }
.picker-row.selected .model-pick>.icon { color: var(--accent); width: 17px; height: 17px; }
.model-pick:focus-visible { box-shadow: none; outline: 1px solid var(--accent-56); outline-offset: -2px; border-radius: var(--radius-sm); }
.model-pick .model-name { font-weight: 550; margin-bottom: 2px; }
.picker-actionbar { display: flex; gap: 2px; align-items: center; border-top: 1px solid var(--line); padding-top: 8px; margin-top: 4px; }
.picker-actionbar .button { font-size: 12px; padding-inline: 10px; }
.picker-key-hint { margin-right: auto; font-size: 12px; color: var(--text-muted); display: flex; align-items: center; gap: 4px; padding-left: 6px; }
kbd { font: 12px/1.7 var(--mono); border: 1px solid var(--line); border-bottom-color: var(--line-hover); border-radius: 4px; background: var(--bg-hover); min-width: 19px; padding: 0 4px; text-align: center; color: var(--text-secondary); }
.model-picker .dialog-body { display: flex; flex-direction: column; overflow: hidden; }
.model-picker .picker-search,.model-picker .picker-actionbar { flex-shrink: 0; }
.model-picker .picker-list { overflow-y: auto; min-height: 0; overscroll-behavior: contain; }
.sheet-handle { display: none; }
.toast { position: fixed; z-index: 100; top: max(76px,env(safe-area-inset-top)); left: 50%; transform: translateX(-50%); max-width: calc(100vw - 32px); width: max-content; padding: 12px 18px; border: none; border-radius: var(--radius-md); background: var(--bg-soft); box-shadow: var(--shadow-soft); display: flex; align-items: center; gap: 10px; font-size: 14px; pointer-events: none; }
.toast .icon { color: var(--accent); }
.error-block { margin: 18px 0; padding: 12px 0 12px 15px; border-left: 2px solid var(--accent); color: var(--text-secondary); font-size: 14px; overflow-wrap: anywhere; }
.error-block strong { color: var(--text); font-weight: 550; display: block; margin-bottom: 6px; }
.error-block p { margin-bottom: 8px; }
.error-block details { margin: 10px 0 0; font-size: 12px; }
.error-block pre { white-space: pre-wrap; overflow-wrap: anywhere; }
summary { min-height: 44px; cursor: pointer; display: list-item; padding: 10px 0; }
@supports (backdrop-filter: blur(24px)) {
  dialog,.toast,.to-bottom { background: var(--glass); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); }
}
@media (hover:hover) {
  .button:hover,.icon-button:hover,.chat-row:hover,.picker-row:hover { background: var(--bg-hover); text-decoration: none; }
  .button.primary:hover { background: var(--accent); opacity: .86; }
  .icon-button:hover { color: var(--text); }
  .composer:hover { border-color: var(--line-hover); }
}