:root{--color-bg: #f5f6f8;--color-surface: #ffffff;--color-border: #d8dce3;--color-text: #1a1f2e;--color-muted: #6b7280;--color-primary: #2d4a8a;--color-primary-hover: #1f3566;--color-danger: #b91c1c;--color-success: #15803d;--radius: 8px;--space: 1rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.5}a{color:var(--color-primary);text-decoration:none}.app-layout{display:grid;grid-template-columns:240px 1fr;grid-template-rows:56px 1fr;grid-template-areas:"header header" "sidebar main";height:100vh}.app-header{grid-area:header;display:flex;align-items:center;justify-content:space-between;padding:0 var(--space);background:var(--color-surface);border-bottom:1px solid var(--color-border)}.app-header__title{font-size:1rem;font-weight:600}.app-sidebar{grid-area:sidebar;background:var(--color-surface);border-right:1px solid var(--color-border);padding:var(--space) 0;overflow-y:auto}.app-sidebar__nav{list-style:none}.app-sidebar__nav li a{display:block;padding:.5rem var(--space);color:var(--color-text)}.app-sidebar__nav li a:hover,.app-sidebar__nav li a.active{background:var(--color-bg);color:var(--color-primary)}.app-main{grid-area:main;padding:var(--space);overflow-y:auto}.form{max-width:360px;display:flex;flex-direction:column;gap:.75rem}.form__field{display:flex;flex-direction:column;gap:.25rem}.form__label{font-size:.875rem;font-weight:500}.form__input{padding:.5rem .75rem;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.9375rem}.form__input:focus{outline:2px solid var(--color-primary);outline-offset:-1px}.btn{padding:.5rem 1rem;border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);cursor:pointer;font-size:.9375rem}.btn--primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.btn--primary:hover{background:var(--color-primary-hover)}.login-page{display:flex;align-items:center;justify-content:center;height:100vh}.login-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:2rem;width:100%;max-width:380px}.login-card__title{margin-bottom:1.5rem;font-size:1.25rem}.alert{padding:.75rem;border-radius:var(--radius);font-size:.875rem;margin-bottom:.5rem}.alert--error{background:#fef2f2;color:var(--color-danger);border:1px solid #fecaca}@media (max-width: 768px){.app-layout{grid-template-columns:1fr;grid-template-areas:"header" "main"}.app-sidebar{display:none}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;padding:1rem;z-index:100}.modal-card{background:var(--color-surface);border-radius:var(--radius);padding:1.5rem;width:100%;max-width:480px;max-height:90vh;overflow-y:auto;box-shadow:0 8px 32px #00000026}.modal-card h2{font-size:1.125rem;margin-bottom:.5rem}.modal-card h3{font-size:1rem;margin-bottom:.5rem}.stat-card{display:flex;flex-direction:column;gap:.15rem;padding:.75rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius)}.stat-card__label{font-size:.75rem;color:var(--color-muted);text-transform:uppercase;letter-spacing:.04em}.stat-card__value{font-size:1.125rem;font-weight:600}