:root{--color-bg:#f7f8fb;--color-surface:#fff;--color-border:#e4e7ec;--color-text:#101828;--color-text-secondary:#667085;--color-text-tertiary:#98a2b3;--color-accent:#4f46e5;--color-accent-hover:#4338ca;--color-accent-soft:#eef2ff;--color-danger:#dc2626;--color-danger-soft:#fef2f2;--color-danger-border:#fecaca;--color-warning:#b45309;--color-warning-soft:#fffbeb;--color-warning-border:#fde68a;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--shadow-sm:0 1px 2px #1018280d;--shadow-md:0 4px 12px #10182814;--sidebar-width:220px}*{box-sizing:border-box}html,body,#root{height:100%}body{color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,Roboto,sans-serif;font-size:14px;line-height:1.5}h1,h2{letter-spacing:-.02em;margin:0 0 20px;font-weight:600}h1{font-size:22px}h2{font-size:16px}p{margin:0 0 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var(--color-border);border-radius:var(--radius-lg);width:360px;box-shadow:var(--shadow-md);padding:32px}.login-form h1{text-align:center}.login-form button[type=submit]{width:100%;margin-top:8px;padding:10px}.settings-form,.invoice-form,.image-uploads,.backup-section{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);max-width:560px;box-shadow:var(--shadow-sm);padding:24px}.invoice-form{max-width:100%}.image-uploads,.backup-section{margin-top:20px}.backup-section .warning-text{color:var(--color-danger);font-weight:500}.client-form{align-items:flex-start;gap:10px;margin-bottom:20px;display:flex}.client-form input{flex:1;width:auto}.invoices-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.invoices-header h1{margin:0}.invoices-header a{border-radius:var(--radius-sm);background:var(--color-accent);color:#fff;padding:8px 16px;font-weight:500}.invoices-header 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