:root{--bg:#0b1020;--fg:#e7ecf5;--accent:#3fb950;--warn:#d29922;--card:#161b2c}*{box-sizing:border-box}body{margin:0;font:16px/1.5 system-ui,sans-serif;background:var(--bg);color:var(--fg)}#app{max-width:900px;margin:0 auto;padding:2rem 1rem}.card{background:var(--card);border-radius:12px;padding:1.25rem;margin:1rem 0}.hero{font-size:2.4rem;font-weight:700;color:var(--accent)}.warn{color:var(--warn)}button{font:inherit;padding:.6rem 1rem;border-radius:8px;border:0;cursor:pointer}.dropzone{border:2px dashed #2a3350;border-radius:12px;padding:3rem;text-align:center}.dropzone.drag{border-color:var(--accent)}