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.yhc-ai::backdrop{background:#0007;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.yhc-ai[open]{animation:ai-arrive .6s cubic-bezier(.22,1,.36,1) both}
.yhc-ai.ai-closing{animation:ai-depart .4s ease both}
.ai-header{height:74px;padding:18px 24px;display:flex;align-items:center;justify-content:space-between;position:relative;z-index:2}
.ai-header h2{font-size:14px;font-weight:500;letter-spacing:.17em;margin:0;color:#eee}
.ai-close,.ai-mute{display:grid;place-items:center;width:40px;height:40px;padding:0;border-radius:50%;border:1px solid #ffffff24;background:linear-gradient(145deg,#ffffff14,#ffffff05);box-shadow:inset 0 1px #ffffff18;color:#eee;font:300 25px/1 Arial;cursor:pointer}
.ai-intro{position:absolute;inset:0;display:grid;place-items:center;padding:25px;text-align:center;background:#08080899}
.ai-intro-title{position:relative;transform:translateY(1.8em);font:400 clamp(15px,3.7vw,20px)/1.8 "IBM Plex Mono",monospace;margin:0;color:#ecece8}
.ai-lead{display:block;position:absolute;bottom:calc(100% + 24px);left:50%;transform:translateX(-50%);font-size:clamp(13px,3.5vw,17px);color:#d6d6d2;white-space:nowrap}
.ai-letter{opacity:0}.ai-letter.is-visible{opacity:1}
.ai-life-word{display:block;position:relative;width:max-content;margin:0 auto;font-size:clamp(36px,9vw,46px);line-height:1.25;font-weight:400;letter-spacing:.08em;padding-left:.08em;color:#f8f8f2}
.ai-life{display:inline-block;filter:blur(3px);transform:translateY(3px);transition:opacity 1.2s ease,filter 1.5s ease,transform 1.5s ease}
.ai-life.is-visible{filter:blur(0);transform:translateY(0);animation:ai-life 4.8s ease-in-out 2}
.ai-ellipsis{position:absolute;left:100%;bottom:5px;font-size:20px;letter-spacing:0;opacity:0;transition:opacity 1s ease}.ai-ellipsis.is-visible{opacity:.55}
.ai-conversation{height:calc(100% - 74px);display:flex;flex-direction:column;min-height:0}
.ai-messages{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;scrollbar-width:thin;scrollbar-color:#ffffff26 transparent;padding:30px 30px 12px}
.ai-message{max-width:90%;margin:0 0 26px;line-height:1.75;font-size:15px;overflow-wrap:anywhere;word-break:normal}
.ai-message p{margin:0;white-space:pre-wrap}.ai-assistant{padding:6px 0;color:#e9e9e5}.ai-user{margin-left:auto;padding:13px 18px;border-radius:20px 20px 5px 20px;background:#ffffff0c;border:1px solid #ffffff15}
.ai-message.is-generating:empty::after{content:'…'}.ai-message.is-generating p:empty::after{content:'…';color:#aaa}
.ai-message.is-interrupted{opacity:.65}
.ai-footer{flex:none;padding:6px 24px max(22px,env(safe-area-inset-bottom));background:linear-gradient(transparent,#14141440)}
.ai-status{min-height:20px;margin:0 4px 9px;font-size:12px;line-height:1.5;color:#bbb}
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.ai-composer.is-visible{opacity:1}.ai-composer textarea{display:block;flex:1;min-width:0;resize:none;min-height:42px;max-height:136px;overflow-y:auto;background:none;border:0;color:#f0f0ec;font:400 16px/1.6 -apple-system,BlinkMacSystemFont,"Helvetica Neue","PingFang SC",sans-serif;padding:8px 10px;margin:0;outline:none}
.ai-composer textarea::placeholder{color:#a4a4a4}.ai-composer:focus-within{border-color:#ffffff55}
.ai-send{display:grid;place-items:center;padding:0;width:42px;height:42px;flex:none;border-radius:50%;border:1px solid #ffffff24;color:#eee;background:#ffffff16;cursor:pointer;font:400 23px/1 Arial;transition:background .3s ease,opacity .3s ease}.ai-send:disabled{opacity:.3;cursor:default}.ai-send:hover:not(:disabled){background:#ffffff2a}
.ai-retry{border:0;background:none;color:#eee;font:inherit;font-size:12px;text-decoration:underline;text-underline-offset:3px;padding:0 4px 12px;cursor:pointer}
.ai-close:focus-visible,.ai-mute:focus-visible,.ai-send:focus-visible,.ai-retry:focus-visible{outline:none;background-color:#ffffff20}
.ai-note{font-size:10px;color:#929292;text-align:center;line-height:1.5;margin:10px 0 0}
.ai-sr{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.yhc-ai [hidden],#chat-load-error[hidden]{display:none!important}
#chat-load-error{position:fixed;z-index:99;bottom:24px;left:50%;transform:translateX(-50%);width:min(400px,90vw);padding:16px;background:#222e;border:1px solid #ffffff2a;border-radius:20px;font-size:13px;text-align:center}
@keyframes ai-arrive{from{opacity:0;transform:translateX(-50%) scale(.97)}to{opacity:1;transform:translateX(-50%) scale(1)}}
@keyframes ai-depart{to{opacity:0;transform:translateX(-50%) scale(.98)}}
@keyframes ai-life{0%,100%{text-shadow:0 0 8px #ffffff30}50%{text-shadow:0 0 6px #ffffff88,0 0 20px #ffffff45}}
@media(max-width:600px){.yhc-ai{top:calc(var(--ai-top,0px) + 8px);height:calc(var(--ai-height,100dvh) - 16px);max-height:calc(var(--ai-height,100dvh) - 16px);width:calc(100vw - 16px);border-radius:25px}.ai-header{padding-top:max(16px,env(safe-area-inset-top));padding-left:20px;padding-right:18px}.ai-messages{padding:24px 20px 8px}.ai-footer{padding:4px 14px max(14px,env(safe-area-inset-bottom))}.ai-message{max-width:94%;font-size:15px}}
@media(prefers-reduced-motion:reduce){.yhc-ai[open],.yhc-ai.ai-closing,.ai-life.is-visible{animation:none}.ai-composer,.ai-send{transition:none}}

/* One glass surface unfolds from the title card into the conversation. */
.yhc-ai{--panel-height:min(800px,90dvh,calc(var(--ai-height,100dvh) - 24px));height:var(--panel-height);top:calc(var(--ai-top,0px) + (var(--ai-height,100dvh) - var(--panel-height))/2);transition:none}
.yhc-ai.ai-expanding{transition:width 1.6s cubic-bezier(.22,1,.36,1),height 1.6s cubic-bezier(.22,1,.36,1),top 1.6s cubic-bezier(.22,1,.36,1),border-radius 1.6s ease}
.ai-intro{background:transparent;opacity:1;transition:opacity .8s ease,transform 1s ease}
.yhc-ai.ai-compact{--panel-height:min(370px,calc(var(--ai-height,100dvh) - 32px));width:min(460px,calc(100vw - 32px))}
.yhc-ai.ai-expanding .ai-intro{opacity:0;transform:translateY(-5px);pointer-events:none}
.yhc-ai.ai-ready .ai-conversation{animation:ai-chat-reveal 1s ease both}
@keyframes ai-chat-reveal{from{opacity:0}to{opacity:1}}
@media(max-width:600px){.yhc-ai{--panel-height:calc(var(--ai-height,100dvh) - 16px)}.yhc-ai.ai-compact{--panel-height:min(350px,calc(var(--ai-height,100dvh) - 32px))}}
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.ai-send svg{display:block;width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round}
.ai-close,.ai-mute{transition:background-color .35s ease,transform .35s ease;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
@media(hover:hover) and (pointer:fine){.ai-close:hover,.ai-mute:hover{background-color:#ffffff14}}.ai-close:active,.ai-mute:active{transform:scale(.96)}
@media(prefers-reduced-motion:reduce){.ai-close,.ai-mute{transition:none}}

.ai-messages:focus{outline:none}.ai-messages:focus-visible{background-color:#ffffff02}

@media(prefers-reduced-motion:reduce){.yhc-ai.ai-expanding{transition:none}}

.yhc-ai:focus,.stories-shell:focus,.story-reader:focus{outline:none}

.ai-owner-feedback{font-size:12px;margin-top:16px;color:#bbb}.ai-owner-feedback summary{cursor:pointer}.ai-owner-feedback button{color:#ddd;background:#ffffff0b;border:1px solid #ffffff20;border-radius:12px;font:inherit;padding:7px 12px;cursor:pointer;margin:5px}.ai-owner-feedback textarea{width:100%;min-height:70px;max-height:180px;resize:vertical;background:#ffffff08;border:1px solid #ffffff24;color:#eee;font-family:inherit;font-size:16px;line-height:1.5;border-radius:12px;padding:10px}.ai-owner-feedback p{font-size:11px;color:#aaa}.ai-owner-feedback button:focus-visible{background-color:#ffffff20}

.ai-geo-credit{color:inherit;text-decoration:underline;text-underline-offset:2px;white-space:nowrap}

.ai-reveal-unit{animation:ai-reply-ink 600ms cubic-bezier(.22,1,.36,1) both}
@keyframes ai-reply-ink{from{opacity:0}to{opacity:1}}
@media(prefers-reduced-motion:reduce){.ai-reveal-unit{animation:none}}

.ai-header-actions{display:flex;align-items:center;gap:10px}
.yhc-ai:not(.ai-ready) .ai-mute{visibility:hidden;pointer-events:none}
.ai-mute svg{display:block;width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ai-mute .ai-sound-off{display:none}
.ai-mute[aria-pressed="true"] .ai-sound-on{display:none}
.ai-mute[aria-pressed="true"] .ai-sound-off{display:block}

.ai-welcome{animation:ai-chat-reveal 1.8s cubic-bezier(.22,1,.36,1) both}
@media(prefers-reduced-motion:reduce){.ai-welcome{animation:none}}