*{margin:0;padding:0;box-sizing:border-box}:root{--primary: oklch(.3 0 0);--primary-dark: oklch(.2 0 0);--bg: oklch(.98 0 0);--surface: oklch(1 0 0);--text: oklch(.2 0 0);--text-secondary: oklch(.5 0 0);--border: oklch(.9 0 0);--shadow: 0 2px 8px oklch(0 0 0 / .08);--accent: oklch(.15 0 0)}body{font-family:"IBM Plex Serif",Georgia,Times New Roman,serif;background:var(--bg);color:var(--text);line-height:1.6;margin:0;padding:0;height:100vh;overflow:hidden}.app-container{display:grid;grid-template-columns:280px 1fr 320px;height:100vh;gap:0}.thumbnail-sidebar{background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;display:flex;flex-direction:column}.sidebar-upload-zone{background:var(--bg);border:2px dashed var(--border);border-radius:12px;padding:24px 16px;margin:12px;text-align:center;cursor:pointer;transition:all .3s 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