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minmax(0,1fr);gap:var(--spacing-xl);padding:var(--spacing-xl) var(--spacing-xxl);max-width:1600px;width:100%;margin:0 auto;box-sizing:border-box;overflow:hidden;transition:padding .35s ease,grid-template-columns .35s ease;position:relative}.app-main--no-history{grid-template-columns:1fr}.history-pane{position:relative;overflow:hidden;height:100%;min-height:0;border-radius:var(--radius-xl);background:transparent}.history-pane__content{border-radius:var(--radius-xl);overflow:hidden;background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--border-width) solid var(--glass-border);box-shadow:var(--glass-shadow);transition:transform .35s ease,box-shadow .35s ease,border-color .35s ease;transform:translate(0);pointer-events:auto;will-change:transform;height:100%;min-height:0}.history-pane.is-hidden .history-pane__content{transform:translate(-110%);pointer-events:none;visibility:hidden}.workspace{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);gap:var(--spacing-xl);height:100%;min-height:0}.workspace-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--text-secondary);font-size:14px;height:100%;width:100%}.editor-pane,.preview-pane{height:100%;min-height:0;border-radius:var(--radius-xl);background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--border-width) solid var(--glass-border);box-shadow:var(--glass-shadow);overflow:hidden;display:flex;flex-direction:column;transition:all .4s cubic-bezier(.25,.8,.25,1)}.editor-pane:hover,.preview-pane:hover{transform:translateY(-4px);box-shadow:var(--shadow-premium);border-color:color-mix(in srgb,var(--border-color) 60%,transparent)}@media(max-width:1440px){.app-main{padding:20px 24px 32px}}@media(max-width:1280px){.app-main{grid-template-columns:240px 1fr}.workspace{grid-template-columns:1fr}}@media(max-width:960px){.app-main{grid-template-columns:1fr;grid-template-rows:auto 1fr;padding:16px;height:auto}.history-pane{height:auto}}.history-toggle{position:fixed;left:16px;top:50%;transform:translateY(-50%);z-index:1500;width:36px;height:36px;padding:0;border-radius:var(--radius-pill);display:flex;align-items:center;justify-content:center;border:var(--border-width) solid color-mix(in srgb,var(--accent-primary) 60%,transparent);background:color-mix(in srgb,var(--bg-primary) 85%,transparent);color:var(--text-primary);box-shadow:var(--shadow-md);cursor:pointer;font-size:14px;font-weight:600;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.history-toggle:before{content:"‹";display:block;text-align:center;font-size:16px;line-height:1;color:inherit}.history-toggle:hover{transform:translateY(-50%) translate(2px);box-shadow:var(--shadow-lg);background:var(--bg-primary);border-color:var(--accent-primary)}.history-toggle.is-collapsed{background:var(--text-primary);color:var(--bg-primary);border-color:color-mix(in srgb,var(--text-primary) 35%,transparent);transform:translateY(-50%) translate(-1px);box-shadow:var(--shadow-lg)}.history-toggle.is-collapsed:before{content:"›"}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}