:root{--input-panel-height: 112px;--composer-max-width: 600px;--content-horizontal-padding: clamp(14px, 4vw, 20px);--message-max-width: 540px;--history-sheet-width: min(92vw, 430px);--top-chrome-transition: .3s var(--ease-emphasized);--motion-fast: .12s;--motion-normal: .24s;--motion-slow: .44s;--hero-height: clamp(198px, 25dvh, 248px);--top-surface-start: #747d8a;--top-surface-raised-start: #808995;--top-surface-raised-end: #78818e;--top-surface-join: #7c8592;--top-surface-mid: #929aa6;--top-surface-end: #adb4be;--ease-standard: cubic-bezier(.2, 0, 0, 1);--ease-emphasized: cubic-bezier(.16, 1, .3, 1);--ease-press: cubic-bezier(.2, 0, .2, 1);--spring-soft: linear(0, .0261, .0926, .1843, .2893, .3984, .505, .6047, .6945, .7729, .8394, .8943, .9382, .9722, .9976, 1.0156, 1.0275, 1.0346, 1.0379, 1.0383, 1.0367, 1.0338, 1.0301, 1.0259, 1.0218, 1.0177, 1.014, 1.0107, 1.0078, 1.0054, 1.0035, 1.0019, 1.0007, 1);--spring-bouncy: linear(0, .0411, .1461, .2894, .4496, .6094, .7566, .883, .9844, 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var(--ease-standard)}.header:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;border-radius:inherit;background:var(--header-surface);transform:translateZ(0);transition:background var(--top-chrome-transition),opacity var(--top-chrome-transition)}.header>*{position:relative;z-index:1}.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;will-change:transform,opacity;transition:transform var(--top-chrome-transition),opacity var(--motion-normal) var(--ease-standard)}.logo{height:28px;width:auto;object-fit:contain;filter:drop-shadow(0px 1px 3px rgba(0,0,0,.25));flex-shrink:0}.header-action-label{line-height:1}.history-toggle,.new-chat-toggle{border:1px solid rgba(255,255,255,.14);background:#ffffff1f;color:#fff;border-radius:999px;padding:7px 12px;min-height:34px;font-size:13px;font-weight:600;line-height:1;white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:6px;cursor:pointer;box-shadow:inset 0 1px 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