.theme-slider{--slider-track: linear-gradient(120deg, #1f1f1f, #0a0a0a);--slider-thumb: #080808;--slider-border: rgba(255, 255, 255, .16);--slider-shadow: 0 4px 10px rgba(0, 0, 0, .35);position:relative;width:64px;height:34px;padding:0;border:1px solid var(--slider-border);border-radius:999px;background:transparent;cursor:pointer;outline:none;display:inline-flex;align-items:center;justify-content:center;transition:border-color .2s ease,box-shadow .2s ease}.theme-slider .slider-track{position:relative;width:56px;height:26px;border-radius:999px;background:var(--slider-track);display:block;transition:background .3s ease}.theme-slider .slider-thumb{position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:var(--slider-thumb);box-shadow:var(--slider-shadow);transition:transform .25s ease,background .25s ease,box-shadow .25s ease}.theme-slider.slider-dark{--slider-track: linear-gradient(135deg, #1b1b1b, #000000);--slider-thumb: #0c0c0c;--slider-border: rgba(255, 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900px){.calculator,.calculator-panels{flex-direction:column}.left-panel{flex-basis:auto!important;min-width:unset}.panel-resizer{display:none}.panel-header{flex-direction:column;align-items:flex-start;gap:.5rem}}:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;--bg: #000000;--page-bg: #000000;--text-color: #f2f2f2;--muted-text: #b7b7b7;--surface: #0b0b0b;--surface-muted: #111111;--surface-strong: #161616;--surface-hover: rgba(255, 255, 255, .08);--border-subtle: #1f1f1f;--accent: #000000;--button-text: #f8fbff;--shadow: 0 12px 32px rgba(0, 0, 0, .35)}.app-shell{background:var(--page-bg);color:var(--text-color);min-height:100vh;display:flex;flex-direction:column}body[data-theme=light]{--bg: #f2f4f8;--page-bg: radial-gradient(circle at 20% 20%, rgba(126, 208, 255, .35), transparent 30%), radial-gradient(circle at 80% 0%, rgba(147, 197, 253, .25), transparent 25%), #f2f4f8;--text-color: #0f1b2e;--muted-text: #5c677d;--surface: #ffffff;--surface-muted: #f8fbff;--surface-strong: #0e1a2b;--surface-hover: rgba(15, 27, 46, .06);--border-subtle: #e3e8f0;--accent: #000000;--button-text: #f8fbff;--shadow: 0 12px 32px rgba(15, 27, 46, .08)}body{margin:0;min-height:100vh;background:var(--page-bg)}.page-shell{flex:1;padding:1.5rem}.page-section{background:var(--surface);border-radius:14px;padding:1.25rem 1.5rem;box-shadow:var(--shadow);border:1px solid var(--border-subtle)}.page-section.frameless{background:transparent;border:none;box-shadow:none;padding:0}.page-section.full-bleed{padding:0;overflow:hidden}.section-heading{margin:0 0 .75rem;font-size:1.4rem;color:var(--text-color)}.text-muted{color:var(--muted-text)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.card{padding:1rem;border:1px solid var(--border-subtle);border-radius:12px;background:var(--surface-muted);box-shadow:0 6px 18px #0003;color:var(--text-color)}.card h3{margin:0 0 .35rem}.link-button{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .85rem;border-radius:8px;background:var(--accent);color:var(--button-text, #f8fbff);border:none;cursor:pointer;font-weight:600;transition:background .2s ease,transform .1s ease}.link-button:hover{background:color-mix(in srgb,var(--accent) 85%,#ffffff 15%);transform:translateY(-1px)}.small-divider{margin:1rem 0;border:none;border-top:1px solid var(--border-subtle)}.tool-card{display:flex;flex-direction:column;gap:.5rem}.tool-meta{margin:0;color:var(--muted-text)}.tile-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,360px));justify-content:center;gap:1rem}.tile-card{position:relative;aspect-ratio:16 / 9;width:min(420px,100%);border-radius:14px;border:1px solid var(--border-subtle);background:var(--surface-muted);box-shadow:var(--shadow);cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,border-color .2s 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