* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: "Segoe UI", Arial, sans-serif;
    background: #e2e2e2;
    color: #1a1a1a;
    min-height: 100vh;
    line-height: 1.55;
}

a { color: #1a1a1a; text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

.site-header {
    background: #fff;
    border-bottom: 3px solid #1a1a1a;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    gap: 16px;
    flex-wrap: wrap;
}

.logo {
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #1a1a1a;
    padding-left: 14px;
    border-left: 4px solid #1a1a1a;
}

nav { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
nav a { color: #444; font-size: 0.9rem; }
nav a:hover { color: #1a1a1a; }

.user-badge {
    font-size: 0.82rem;
    color: #333;
    border: 1px solid #999;
    padding: 5px 11px;
    background: #f7f7f7;
}

main.container { padding: 32px 20px 56px; }

.page-title {
    font-size: 1.2rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 22px;
    padding-bottom: 10px;
    border-bottom: 2px solid #bbb;
}

.card {
    background: #fff;
    border: 1px solid #aaa;
    border-left: 4px solid #333;
    padding: 22px 24px;
    margin-bottom: 16px;
}

.card h1 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; }
.card h2, .card h3 { font-size: 1.02rem; font-weight: 600; margin-bottom: 10px; }
.card h2 a, .card h3 a { color: #1a1a1a; }
.card-meta, .book-meta { font-size: 0.85rem; color: #555; margin-bottom: 8px; }
.price { font-weight: 600; margin-top: 8px; font-size: 1rem; }

.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 14px; }
.book-grid .card { margin-bottom: 0; display: flex; flex-direction: column; }
.book-grid .card p { flex: 1; font-size: 0.9rem; color: #444; }

.btn {
    display: inline-block;
    text-align: center;
    color: #1a1a1a;
    background: #fff;
    border: 1px solid #1a1a1a;
    padding: 10px 18px;
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
}

.btn:hover { background: #1a1a1a; color: #fff; text-decoration: none; }
.btn-sm { padding: 6px 12px; font-size: 0.82rem; }
.btn-outline { background: #fff; color: #1a1a1a; }
.btn-danger { border-color: #1a1a1a; }

.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 6px; color: #333; font-size: 0.88rem; font-weight: 500; }

input, textarea, select {
    width: 100%;
    padding: 10px 12px;
    background: #fff;
    border: 1px solid #999;
    font-size: 0.95rem;
    font-family: inherit;
}

input:focus, textarea:focus, select:focus { outline: none; border-color: #1a1a1a; }

.form-narrow { max-width: 420px; }
.form-narrow.center { margin: 0 auto; }

.auth-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    align-items: start;
    max-width: 720px;
    margin: 0 auto;
}

.auth-layout .card { margin-bottom: 0; }

.demo-box h3 {
    font-size: 0.88rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid #ccc;
}

.demo-account { margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px dashed #ccc; }
.demo-account:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
.demo-account-title { font-size: 0.82rem; font-weight: 600; color: #444; margin-bottom: 8px; }

.demo-box input[readonly] {
    background: #f5f5f5;
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.9rem;
    cursor: text;
}

.demo-hint { font-size: 0.8rem; color: #666; margin-top: 10px; }

.alert {
    padding: 12px 15px;
    border: 1px solid #aaa;
    background: #fff;
    margin-bottom: 18px;
    font-size: 0.9rem;
    border-left: 4px solid #333;
}

.alert-success { background: #fafafa; }
.alert-error { background: #f3f3f3; }

.filters {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: end;
    background: #fff;
    border: 1px solid #aaa;
    border-left: 4px solid #333;
    padding: 18px;
    margin-bottom: 22px;
}

.filters .form-group { margin: 0; flex: 1; min-width: 150px; }

.badge {
    display: inline-block;
    padding: 3px 8px;
    border: 1px solid #999;
    font-size: 0.72rem;
    background: #f5f5f5;
    color: #333;
}

.text-muted { color: #555; font-size: 0.88rem; }
.back-link { display: inline-block; margin-top: 18px; font-size: 0.9rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td { padding: 10px 12px; text-align: left; border: 1px solid #aaa; }
th { background: #f0f0f0; font-weight: 600; font-size: 0.78rem; text-transform: uppercase; }

.admin-layout { display: grid; grid-template-columns: 200px 1fr; gap: 20px; }
.admin-nav {
    background: #fff;
    border: 1px solid #aaa;
    border-left: 4px solid #333;
    padding: 16px;
    height: fit-content;
}
.admin-nav a { display: block; padding: 8px 0; color: #444; font-size: 0.88rem; border-bottom: 1px solid #eee; }
.admin-nav a:last-child { border-bottom: none; }
.admin-nav strong { display: block; margin-bottom: 10px; font-size: 0.82rem; text-transform: uppercase; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }
.stat-grid .card { text-align: center; margin-bottom: 0; }
.stat-grid .card h3 { font-size: 1.6rem; margin-bottom: 4px; }
.stat-grid .card p { font-size: 0.85rem; color: #555; }

@media (max-width: 700px) {
    .header-inner { flex-direction: column; align-items: flex-start; }
    .admin-layout { grid-template-columns: 1fr; }
    .auth-layout { grid-template-columns: 1fr; }
}