:root{--bg:#f5f6f8;--surface:#fff;--border:#d9dce1;--text:#1c1f24;--text-muted:#6b7280;--accent:#2f6feb;--accent-contrast:#fff;--error-bg:#fdeceb;--error-border:#e5534b;--error-text:#8a1f16;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-family:system-ui,Segoe UI,Roboto,sans-serif}:root[data-theme=dark]{--bg:#14161a;--surface:#1b1e24;--border:#2e333c;--text:#e6e8eb;--text-muted:#9aa1ac;--accent:#5b9dff;--accent-contrast:#0b1220;--error-bg:#3a1c1c;--error-border:#e5534b;--error-text:#ffb4ac;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}.app{max-width:720px;margin:0 auto;padding:24px 20px 48px}.site-header{align-items:center;gap:10px;margin-bottom:12px;display:flex}.site-header__brand{color:var(--accent);white-space:nowrap;font-size:15px;font-weight:700;text-decoration:none}.site-header__brand:hover{text-decoration:underline}.site-header__divider{color:var(--text-muted);font-weight:400}.site-header__title{color:var(--text-muted);white-space:nowrap;font-size:15px;font-weight:600}.toolbar-spacer{flex:1}.btn,.toggle-btn{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:6px;padding:6px 12px;font-size:13px}.btn:hover,.toggle-btn:hover{border-color:var(--accent)}.btn:disabled{opacity:.5;cursor:not-allowed}.icon-btn{padding:6px 10px}h1{margin:8px 0 4px;font-size:28px}.app-description{color:var(--text-muted);margin:0 0 24px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px}.panel__label{color:var(--text-muted);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.qr-input{border:1px solid var(--border);background:var(--bg);width:100%;min-height:88px;color:var(--text);resize:vertical;border-radius:8px;padding:10px 12px;font-family:inherit;font-size:14px}.qr-input:focus{border-color:var(--accent);outline:none}.qr-size-row{align-items:center;gap:12px;margin-top:16px;display:flex}.qr-size-row input[type=range]{accent-color:var(--accent);flex:1}.qr-size-row__value{color:var(--text-muted);text-align:right;min-width:64px;font-size:13px}.qr-preview{border:1px dashed var(--border);background:var(--bg);border-radius:10px;flex-direction:column;align-items:center;gap:16px;margin-top:24px;padding:24px;display:flex}.qr-preview canvas{border-radius:8px;max-width:100%}.qr-preview__placeholder{color:var(--text-muted);text-align:center;font-size:14px}.qr-preview__actions{gap:10px;display:flex}.btn--primary{background:var(--accent);border-color:var(--accent);color:var(--accent-contrast);font-weight:600}.btn--primary:hover{border-color:var(--accent);opacity:.9}