/* Personal AI skins V23: current ocean skin remains the untouched default. */
.ai-skin-section {
    margin:1rem 0;
    padding:1rem;
    border:1px solid rgb(255 255 255 / .13);
    border-radius:14px;
    background:linear-gradient(145deg,rgb(255 255 255 / .045),rgb(73 94 165 / .055));
}
.ai-skin-heading {
    display:flex;
    align-items:flex-start;
    justify-content:space-between;
    gap:.8rem;
    margin-bottom:.75rem;
}
.ai-skin-heading h4 { margin:0;color:#edf4fb;font-size:14px;font-weight:650;line-height:22px; }
.ai-skin-heading p { margin:2px 0 0;color:#90a3b7;font-size:12px;line-height:18px; }
.ai-skin-heading>span {
    flex:none;
    padding:.22rem .48rem;
    border:1px solid rgb(121 203 255 / .24);
    border-radius:999px;
    color:#8dd6ff;
    background:rgb(31 128 205 / .14);
    font-size:11px;
    font-weight:750;
}
.ai-skin-grid { display:grid;gap:.48rem; }
.ai-skin-grid>button {
    display:grid;
    grid-template-columns:64px minmax(0,1fr) 18px;
    align-items:center;
    gap:.68rem;
    width:100%;
    padding:.52rem;
    border:1px solid rgb(255 255 255 / .095);
    border-radius:11px;
    color:#dce8f4;
    background:rgb(2 12 25 / .22);
    text-align:left;
    transition:border-color .18s ease,background .18s ease,transform .18s ease;
}
.ai-skin-grid>button:hover { border-color:rgb(121 203 255 / .38);background:rgb(31 128 205 / .09);transform:translateY(-1px); }
.ai-skin-grid>button[aria-checked="true"] { border-color:rgb(121 203 255 / .56);background:rgb(31 128 205 / .15);box-shadow:0 0 0 2px rgb(31 128 205 / .08); }
.ai-skin-grid>button>span { min-width:0; }
.ai-skin-grid strong,.ai-skin-grid small { display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap; }
.ai-skin-grid strong { color:inherit;font-size:.76rem;font-weight:740; }
.ai-skin-grid small { margin-top:.12rem;color:#879bb0;font-size:.66rem; }
.ai-skin-preview { display:block;width:64px;height:42px;border:1px solid rgb(255 255 255 / .16);border-radius:8px;background-position:center;background-size:cover;box-shadow:inset 0 1px rgb(255 255 255 / .1); }
.ai-skin-preview--ocean { background:radial-gradient(circle at 24% 18%,rgb(41 188 221 / .52),transparent 35%),radial-gradient(circle at 80% 42%,rgb(74 91 230 / .48),transparent 42%),linear-gradient(135deg,#03101c,#062a40 48%,#07162e); }
.ai-skin-preview--aurora { background-image:linear-gradient(rgb(1 7 20 / .08),rgb(1 7 20 / .14)),url("personal-ai-skin-aurora-20260922.webp"); }
.ai-skin-preview--study { border-color:rgb(102 85 56 / .19);background-image:linear-gradient(rgb(255 248 231 / .05),rgb(255 248 231 / .08)),url("personal-ai-skin-study-20260922.webp"); }
.ai-skin-check { color:#71c9ff;opacity:0;transform:scale(.8);transition:.18s ease; }
.ai-skin-grid>button[aria-checked="true"] .ai-skin-check { opacity:1;transform:scale(1); }
.ai-aqua-ocean-only[hidden] { display:none; }

/* Aurora Cosmos: a dark, focused alternative with the current layout intact. */
.ai-shell.ai-skin-aurora {
    --ai-text:#eef3ff;
    --ai-muted:#9aaaca;
    --ai-panel:#11182d;
    --ai-line:#334265;
    --ai-accent:#8d7cff;
    color-scheme:dark;
    background:#030713;
}
.ai-shell.ai-skin-aurora:not(.aqua-wallpaper) .ai-aqua-fluid {
    position:absolute;
    z-index:-2;
    inset:-18px;
    display:block;
    background-image:linear-gradient(180deg,rgb(1 7 20 / .04),rgb(1 7 20 / .16)),url("personal-ai-skin-aurora-20260922.webp");
    background-position:center;
    background-size:cover;
    filter:saturate(108%);
    transform:scale(1.015);
    animation:ai-skin-background-breathe 16s ease-in-out infinite alternate;
}
.ai-shell.ai-skin-aurora:not(.aqua-wallpaper) .ai-aqua-fluid::before { background:rgb(0 4 15 / .12); }
.ai-shell.ai-skin-aurora .ai-aqua-whale { opacity:.26; }
.ai-shell.ai-skin-aurora .ai-sidebar { border-color:rgb(173 194 255 / .15);background:linear-gradient(155deg,rgb(13 20 48 / calc(.78 * var(--ai-aqua-frost))),rgb(8 14 35 / calc(.64 * var(--ai-aqua-frost))))!important;box-shadow:inset 0 1px rgb(255 255 255 / .07),0 20px 60px rgb(0 0 0 / .26); }
.ai-shell.ai-skin-aurora .ai-main { border-color:rgb(173 194 255 / .12);background:linear-gradient(150deg,rgb(11 19 46 / calc(.48 * var(--ai-aqua-frost))),rgb(5 10 28 / calc(.33 * var(--ai-aqua-frost)))); }
.ai-shell.ai-skin-aurora .ai-topbar { border-color:rgb(173 194 255 / .12);background:linear-gradient(100deg,rgb(13 21 49 / calc(.58 * var(--ai-aqua-frost))),rgb(15 19 48 / calc(.36 * var(--ai-aqua-frost)))); }
.ai-shell.ai-skin-aurora .ai-composer { border-color:rgb(187 193 255 / .24);background:linear-gradient(145deg,rgb(20 27 62 / calc(.75 * var(--ai-aqua-frost))),rgb(8 16 42 / calc(.68 * var(--ai-aqua-frost))));box-shadow:inset 0 1px rgb(255 255 255 / .1),0 22px 54px rgb(0 2 17 / .34); }
.ai-shell.ai-skin-aurora .ai-brand-mark,.ai-shell.ai-skin-aurora .ai-send { background:linear-gradient(135deg,#917cff,#4776df);box-shadow:0 9px 24px rgb(91 72 214 / .34); }
.ai-shell.ai-skin-aurora .ai-new-chat { border-color:rgb(189 179 255 / .34);background:linear-gradient(135deg,rgb(116 87 230 / .66),rgb(46 104 193 / .54)); }
.ai-shell.ai-skin-aurora .ai-ppt-entry { border-color:rgb(101 216 226 / .27);color:#d7fbff;background:linear-gradient(135deg,rgb(28 132 158 / .25),rgb(86 70 175 / .22)); }
.ai-shell.ai-skin-aurora .ai-composer-model-switch button.active { background:linear-gradient(135deg,#806be8,#416ac9); }
.ai-shell.ai-skin-aurora .ai-empty-horizon-mark { border-color:rgb(195 187 255 / .4);color:#f3efff;background:rgb(102 76 205 / .22);box-shadow:0 12px 34px rgb(80 54 190 / .24); }

/* Warm Light Study: light surfaces and dark reading text over a quiet local background. */
.personal-system[data-ai-skin="study"] { --ai-text:#30382f;--ai-muted:#6f796c;--ai-panel:#f8f2e7;--ai-line:#cfc4ae;--ai-accent:#78864d;color-scheme:light;background:#e8dfcf; }
.personal-system[data-ai-skin="study"]::before { background:radial-gradient(circle at 15% 10%,rgb(255 250 232 / .44),transparent 32%),radial-gradient(circle at 90% 85%,rgb(131 143 91 / .14),transparent 30%); }
.ai-shell.ai-skin-study { color-scheme:light;background:#e8dfcf; }
.ai-shell.ai-skin-study:not(.aqua-wallpaper) .ai-aqua-fluid {
    position:absolute;
    z-index:-2;
    inset:-18px;
    display:block;
    background-image:linear-gradient(180deg,rgb(255 250 239 / .02),rgb(240 229 207 / .09)),url("personal-ai-skin-study-20260922.webp");
    background-position:center;
    background-size:cover;
    filter:saturate(94%);
    transform:scale(1.015);
    animation:ai-skin-background-breathe 18s ease-in-out infinite alternate;
}
.ai-shell.ai-skin-study:not(.aqua-wallpaper) .ai-aqua-fluid::before { background:rgb(255 250 239 / .05); }
.ai-shell.ai-skin-study .ai-aqua-whale { display:none!important; }
.ai-shell.ai-skin-study .ai-aqua-edge-top { background:linear-gradient(180deg,rgb(101 84 52 / .13),transparent); }
.ai-shell.ai-skin-study .ai-aqua-edge-bottom { background:linear-gradient(0deg,rgb(101 84 52 / .11),transparent); }
.ai-shell.ai-skin-study .ai-sidebar { border-color:rgb(91 88 70 / .18);background:rgb(255 251 241 / calc(.76 * var(--ai-aqua-frost)))!important;box-shadow:inset 0 1px rgb(255 255 255 / .54),0 18px 48px rgb(92 69 36 / .13);backdrop-filter:blur(var(--ai-aqua-blur)) saturate(104%); }
.ai-shell.ai-skin-study .ai-main { border-color:rgb(91 88 70 / .14);background:rgb(255 252 244 / calc(.47 * var(--ai-aqua-frost)));box-shadow:inset 0 1px rgb(255 255 255 / .46); }
.ai-shell.ai-skin-study .ai-topbar { border-color:rgb(91 88 70 / .14);background:rgb(255 251 241 / calc(.62 * var(--ai-aqua-frost))); }
.ai-shell.ai-skin-study .ai-composer { border-color:rgb(117 109 83 / .26);background:rgb(255 252 244 / calc(.86 * var(--ai-aqua-frost)));box-shadow:inset 0 1px rgb(255 255 255 / .72),0 20px 46px rgb(94 72 38 / .16); }
.ai-shell.ai-skin-study .ai-composer:focus-within { border-color:rgb(119 134 77 / .58);box-shadow:inset 0 1px rgb(255 255 255 / .76),0 0 0 3px rgb(119 134 77 / .12),0 22px 48px rgb(94 72 38 / .18); }
.ai-shell.ai-skin-study .ai-brand,.ai-shell.ai-skin-study .ai-topbar h2,.ai-shell.ai-skin-study .ai-main.ai-empty-state .ai-empty--horizon h1,.ai-shell.ai-skin-study .ai-bubble,.ai-shell.ai-skin-study .ai-bubble h3,.ai-shell.ai-skin-study .ai-bubble h4,.ai-shell.ai-skin-study .ai-bubble h5 { color:#30382f; }
.ai-shell.ai-skin-study .ai-brand small { border-color:rgb(107 118 71 / .24);color:#68734c;background:linear-gradient(135deg,rgb(157 169 111 / .2),rgb(218 180 103 / .16));box-shadow:none; }
.ai-shell.ai-skin-study .ai-brand-mark { color:#fffdf7;background:linear-gradient(135deg,#8b985a,#c1904d);box-shadow:0 8px 22px rgb(133 111 62 / .25); }
.ai-shell.ai-skin-study .ai-new-chat { border-color:rgb(109 125 69 / .35);color:#fff;background:linear-gradient(135deg,rgb(119 137 76 / .92),rgb(159 119 67 / .84));box-shadow:inset 0 1px rgb(255 255 255 / .22),0 12px 28px rgb(107 86 49 / .17); }
.ai-shell.ai-skin-study .ai-ppt-entry { border-color:rgb(88 126 111 / .28);color:#385c50;background:linear-gradient(135deg,rgb(170 201 178 / .34),rgb(197 184 134 / .28)); }
.ai-shell.ai-skin-study .ai-ppt-entry:hover { border-color:rgb(88 126 111 / .5);color:#25473c;background:linear-gradient(135deg,rgb(170 201 178 / .5),rgb(197 184 134 / .4)); }
.ai-shell.ai-skin-study .ai-conversation-search { border-color:rgb(99 98 75 / .18);color:#687267;background:rgb(255 253 247 / .46);box-shadow:inset 0 1px rgb(255 255 255 / .5); }
.ai-shell.ai-skin-study .ai-conversation,.ai-shell.ai-skin-study .ai-sidebar-footer button { color:#596359; }
.ai-shell.ai-skin-study .ai-conversation:hover,.ai-shell.ai-skin-study .ai-conversation.active,.ai-shell.ai-skin-study .ai-sidebar-footer button:hover { border-color:rgb(119 134 77 / .23);color:#2f382f;background:rgb(121 135 80 / .105); }
.ai-shell.ai-skin-study .ai-side-label,.ai-shell.ai-skin-study .ai-topbar p,.ai-shell.ai-skin-study .ai-composer-hint { color:#717a6c; }
.ai-shell.ai-skin-study .ai-sidebar-footer { border-color:rgb(91 88 70 / .14); }
.ai-shell.ai-skin-study .ai-resize-handle::after { color:rgb(86 96 67 / .52);background:rgb(255 252 242 / .52); }
.ai-shell.ai-skin-study .ai-resize-handle:hover::after,.ai-shell.ai-skin-study.is-resizing .ai-resize-handle::after { color:#fff;background:#7d8b50;box-shadow:0 0 18px rgb(125 139 80 / .32); }
.ai-shell.ai-skin-study .ai-topbar .btn-outline-light { border-color:rgb(87 94 70 / .24);color:#4d574d;background:rgb(255 253 247 / .42); }
.ai-shell.ai-skin-study .ai-status,.ai-shell.ai-skin-study .ai-topbar .ai-thinking-toggle { border-color:rgb(94 99 73 / .2);color:#596359;background:rgb(255 253 247 / .44); }
.ai-shell.ai-skin-study .ai-topbar .ai-thinking-toggle.is-off { color:#7b8177;background:rgb(99 95 74 / .06); }
.ai-shell.ai-skin-study .ai-empty-horizon-mark { border-color:rgb(113 126 76 / .34);color:#5f6e3e;background:rgb(158 172 111 / .18);box-shadow:0 12px 30px rgb(119 105 69 / .16); }
.ai-shell.ai-skin-study .ai-main.ai-empty-state .ai-empty--horizon h1 { text-shadow:0 3px 26px rgb(255 252 239 / .8); }
.ai-shell.ai-skin-study .ai-composer textarea { color:#2f382f; }
.ai-shell.ai-skin-study .ai-composer textarea::placeholder { color:#858b80; }
.ai-shell.ai-skin-study .ai-tool-btn { color:#657064; }
.ai-shell.ai-skin-study .ai-tool-btn:hover { color:#2f382f;background:rgb(120 134 77 / .11); }
.ai-shell.ai-skin-study .ai-tool-btn.is-active { border-color:rgb(119 134 77 / .45)!important;color:#4d5e2e!important;background:rgb(119 134 77 / .14)!important; }
.ai-shell.ai-skin-study .ai-composer-model-switch { border-color:rgb(101 101 76 / .2);background:rgb(112 107 81 / .08); }
.ai-shell.ai-skin-study .ai-model-switch button { color:#737a6d; }
.ai-shell.ai-skin-study .ai-composer-model-switch button.active { color:#fff;background:linear-gradient(135deg,#829052,#ad7c48);box-shadow:0 5px 14px rgb(113 87 47 / .2); }
.ai-shell.ai-skin-study .ai-message.user .ai-avatar { color:#fff;background:#8a744d; }
.ai-shell.ai-skin-study .ai-message.assistant .ai-avatar { color:#fff;background:linear-gradient(135deg,#87975a,#b5824c); }
.ai-shell.ai-skin-study .ai-message.user .ai-bubble { border-color:rgb(98 106 77 / .18);background:rgb(255 252 244 / .58);box-shadow:0 8px 24px rgb(86 67 37 / .06); }
.ai-shell.ai-skin-study .ai-thinking,.ai-shell.ai-skin-study .ai-live-thinking { border-color:#849357;color:#626b5f;background:rgb(255 252 244 / .28); }
.ai-shell.ai-skin-study .ai-pending { color:#6f7869; }
.ai-shell.ai-skin-study .ai-bubble code { color:#6c6738; }
.ai-shell.ai-skin-study .ai-code-block,.ai-shell.ai-skin-study .ai-bubble pre { border-color:rgb(79 88 66 / .19);color:#e6ecd9;background:#293128; }
.ai-shell.ai-skin-study .ai-code-head { border-color:rgb(255 255 255 / .09);color:#c9d3bd;background:rgb(255 255 255 / .045); }
.ai-shell.ai-skin-study .ai-code-copy { border-color:rgb(176 192 143 / .24);color:#dce8cb;background:rgb(125 145 82 / .2); }
.ai-shell.ai-skin-study .ai-table-wrap { border-color:rgb(97 101 76 / .19);background:rgb(255 252 244 / .44); }
.ai-shell.ai-skin-study .ai-markdown-table th,.ai-shell.ai-skin-study .ai-markdown-table td { border-color:rgb(97 101 76 / .14); }
.ai-shell.ai-skin-study .ai-markdown-table th { color:#364034;background:rgb(126 143 82 / .14); }
.ai-shell.ai-skin-study .ai-quote { border-color:#879653;color:#4f594d;background:rgb(133 150 84 / .1); }
.ai-shell.ai-skin-study .ai-divider,.ai-shell.ai-skin-study .ai-context-panel { border-color:rgb(97 101 76 / .17); }
.ai-shell.ai-skin-study .ai-context-panel { color:#677063; }
.ai-shell.ai-skin-study .ai-attachment { border-color:rgb(119 134 77 / .24);color:#59653b;background:rgb(119 134 77 / .1); }
.ai-shell.ai-skin-study .ai-attachment button,.ai-shell.ai-skin-study .ai-attachment .ai-attachment-preview { color:#687844; }
.ai-shell.ai-skin-study .ai-send { color:#fff;background:linear-gradient(135deg,#839253,#ad7b47); }
.ai-shell.ai-skin-study .ai-scroll-latest { border-color:rgb(103 106 81 / .22);color:#3b453a;background:rgb(255 252 244 / .88);box-shadow:0 10px 26px rgb(92 69 36 / .14); }
.ai-shell.ai-skin-study .ai-math-block { border-color:rgb(97 101 76 / .18);background:rgb(255 252 244 / .42); }
.ai-shell.ai-skin-study .ai-sidebar,.ai-shell.ai-skin-study .ai-conversation-list,.ai-shell.ai-skin-study .ai-message-list { scrollbar-color:rgb(111 119 89 / .38) transparent; }

/* The settings drawer follows the selected skin so switching remains coherent. */
.personal-system[data-ai-skin="study"] .ai-settings { border-color:rgb(101 96 73 / .2);color:#30382f;background:rgb(247 241 229 / .98);box-shadow:-28px 0 70px rgb(90 69 39 / .22); }
.personal-system[data-ai-skin="study"] .ai-settings h3,.personal-system[data-ai-skin="study"] .ai-settings h4,.personal-system[data-ai-skin="study"] .ai-preset-heading h4,.personal-system[data-ai-skin="study"] .ai-aqua-plugin-card h4,.personal-system[data-ai-skin="study"] .ai-aqua-settings h4 { color:#30382f; }
.personal-system[data-ai-skin="study"] .ai-settings>.d-flex .btn-outline-light { border-color:rgb(96 97 74 / .24);color:#475046;background:rgb(255 255 255 / .48); }
.personal-system[data-ai-skin="study"] .ai-setting-label { color:#596359; }
.personal-system[data-ai-skin="study"] .ai-settings input,.personal-system[data-ai-skin="study"] .ai-settings textarea { border-color:rgb(99 98 74 / .22);color:#30382f;background:rgb(255 253 247 / .7); }
.personal-system[data-ai-skin="study"] .ai-settings-note,.personal-system[data-ai-skin="study"] .ai-preset-heading p,.personal-system[data-ai-skin="study"] .ai-preset-status,.personal-system[data-ai-skin="study"] .ai-aqua-plugin-card p,.personal-system[data-ai-skin="study"] .ai-aqua-group>p { color:#70786a; }
.personal-system[data-ai-skin="study"] .ai-skin-section,.personal-system[data-ai-skin="study"] .ai-preset-section,.personal-system[data-ai-skin="study"] .ai-aqua-plugin-card { border-color:rgb(100 101 77 / .17);background:linear-gradient(145deg,rgb(255 253 247 / .7),rgb(218 209 188 / .3)); }
.personal-system[data-ai-skin="study"] .ai-skin-heading h4 { color:#30382f; }
.personal-system[data-ai-skin="study"] .ai-skin-heading p { color:#70786a; }
.personal-system[data-ai-skin="study"] .ai-skin-heading>span { border-color:rgb(119 134 77 / .25);color:#5d6c39;background:rgb(119 134 77 / .11); }
.personal-system[data-ai-skin="study"] .ai-skin-grid>button { border-color:rgb(99 98 74 / .15);color:#3c463a;background:rgb(255 253 247 / .52); }
.personal-system[data-ai-skin="study"] .ai-skin-grid>button:hover,.personal-system[data-ai-skin="study"] .ai-skin-grid>button[aria-checked="true"] { border-color:rgb(119 134 77 / .42);background:rgb(119 134 77 / .1);box-shadow:0 0 0 2px rgb(119 134 77 / .06); }
.personal-system[data-ai-skin="study"] .ai-skin-grid small { color:#747c70; }
.personal-system[data-ai-skin="study"] .ai-skin-check { color:#718044; }
.personal-system[data-ai-skin="study"] .ai-preset-reset { color:#667440; }
.personal-system[data-ai-skin="study"] .ai-preset-item { border-color:rgb(99 98 74 / .14);color:#394238;background:rgb(255 253 247 / .5); }
.personal-system[data-ai-skin="study"] .ai-preset-item:hover,.personal-system[data-ai-skin="study"] .ai-preset-item.is-active { border-color:rgb(119 134 77 / .42);background:rgb(119 134 77 / .1); }
.personal-system[data-ai-skin="study"] .ai-preset-icon { color:#667440;background:rgb(119 134 77 / .12); }
.personal-system[data-ai-skin="study"] .ai-preset-copy small { color:#747c70; }
.personal-system[data-ai-skin="study"] .ai-preset-save input { border-color:rgb(99 98 74 / .2);color:#30382f;background:rgb(255 253 247 / .72); }
.personal-system[data-ai-skin="study"] .ai-preset-save button { border-color:rgb(119 134 77 / .34);color:#52602f;background:rgb(119 134 77 / .12); }
.personal-system[data-ai-skin="study"] .ai-aqua-master,.personal-system[data-ai-skin="study"] .ai-aqua-mini-toggle,.personal-system[data-ai-skin="study"] .ai-aqua-ghost,.personal-system[data-ai-skin="study"] .ai-aqua-delete,.personal-system[data-ai-skin="study"] .ai-aqua-reset { border-color:rgb(99 98 74 / .22);color:#596359;background:transparent; }
.personal-system[data-ai-skin="study"] .ai-aqua-master[aria-pressed="true"],.personal-system[data-ai-skin="study"] .ai-aqua-mini-toggle[aria-pressed="true"] { border-color:transparent;color:#5d6c39;background:rgb(119 134 77 / .15); }
.personal-system[data-ai-skin="study"] .ai-aqua-group { border-color:rgb(99 98 74 / .16); }
.personal-system[data-ai-skin="study"] .ai-aqua-row>span,.personal-system[data-ai-skin="study"] .ai-aqua-knob>span:first-child { color:#626b60; }
.personal-system[data-ai-skin="study"] .ai-aqua-segmented { border-color:rgb(99 98 74 / .22); }
.personal-system[data-ai-skin="study"] .ai-aqua-segmented button { color:#626b60; }
.personal-system[data-ai-skin="study"] .ai-aqua-segmented button+button { border-color:rgb(99 98 74 / .22); }
.personal-system[data-ai-skin="study"] .ai-aqua-segmented button.active { color:#52602f;background:rgb(119 134 77 / .14); }
.personal-system[data-ai-skin="study"] .ai-aqua-knob>input { accent-color:#7d8c4f; }
.personal-system[data-ai-skin="study"] .ai-aqua-knob input[type="number"] { border-color:rgb(99 98 74 / .22);color:#3f473d;background:rgb(255 253 247 / .68); }
.personal-system[data-ai-skin="study"] .ai-aqua-knob em { color:#777e73; }
.personal-system[data-ai-skin="study"] .ai-settings::-webkit-scrollbar-thumb { background:rgb(106 115 85 / .4);background-clip:padding-box; }

@keyframes ai-skin-background-breathe {
    from { transform:scale(1.015) translate3d(-.25%,0,0); }
    to { transform:scale(1.035) translate3d(.25%,.18%,0); }
}
@media (max-width:767.98px) {
    .ai-shell.ai-skin-aurora:not(.aqua-wallpaper) .ai-aqua-fluid { background-position:50% center; }
    .ai-shell.ai-skin-study:not(.aqua-wallpaper) .ai-aqua-fluid { background-position:52% center; }
    .ai-skin-section { padding:.85rem; }
}
@media (prefers-reduced-motion:reduce) {
    .ai-shell.ai-skin-aurora:not(.aqua-wallpaper) .ai-aqua-fluid,.ai-shell.ai-skin-study:not(.aqua-wallpaper) .ai-aqua-fluid { animation:none;transform:none; }
    .ai-skin-grid>button,.ai-skin-check { transition:none; }
    .ai-skin-grid>button:hover { transform:none; }
}