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(max-width: 640px){.app-header{flex-direction:column;align-items:flex-start}.header-info{justify-content:flex-start}.split{grid-template-columns:1fr}}:root{--color-navy: #0f2044;--color-navy-mid: #1a3360;--color-gold: #b8942a;--color-gold-light: #f0e0a0;--color-surface: #ffffff;--color-bg: #f0f2f5;--color-border: #c8d0dc;--color-text: #0f1c2e;--color-muted: #5a6478;--color-error: #8b1a1a;--color-error-bg: #fdeaea;--color-success-bg: #e6f4ec;--color-success: #14532d;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--shadow-sm: 0 1px 3px rgba(15, 32, 68, .1);--shadow-md: 0 4px 12px rgba(15, 32, 68, .12)}*,*:before,*:after{box-sizing:border-box}body{margin:0;background-color:var(--color-bg);color:var(--color-text);font-family:Inter,Segoe UI,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--color-navy-mid);text-decoration:none}a:hover{text-decoration:underline}button{border:none;border-radius:var(--radius-md);padding:.55rem 1rem;font-size:.9rem;font-weight:600;font-family:inherit;cursor:pointer;transition:background .15s,opacity .15s,box-shadow .15s}button:disabled{opacity:.5;cursor:not-allowed}