:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --border: #d8e0ec;
    --text: #10233c;
    --muted: #667892;
    --primary: #1f6feb;
    --primary-dark: #0f4cb7;
    --success: #0d9c61;
    --error: #d64141;
    --danger: #b42318;
    --sidebar: #10233c;
    --sidebar-text: #dce7f8;
    --shadow: 0 12px 30px rgba(16, 35, 60, 0.08);
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

h1, h2, h3, p {
    margin-top: 0;
}

.app-shell {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--sidebar);
    color: var(--sidebar-text);
    padding: 28px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.brand-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.brand-subtitle {
    color: #a9bdd9;
    font-size: 0.92rem;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-link {
    color: var(--sidebar-text);
    padding: 10px 12px;
    border-radius: 10px;
    display: block;
}

.nav-link:hover,
.nav-link.is-active {
    background: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

.logout-form {
    margin-top: auto;
}

.main-content {
    padding: 28px;
}

.page-header {
    margin-bottom: 20px;
}

.eyebrow {
    color: var(--muted);
    text-transform: uppercase;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.page-title {
    margin-bottom: 0;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 22px;
}

.panel-soft {
    background: var(--surface-soft);
    box-shadow: none;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.content-grid-wide {
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
}

.stat-label {
    display: block;
    color: var(--muted);
    margin-bottom: 8px;
}

.stack {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.row-between,
.row-actions,
.inline-actions,
.inline-form {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: space-between;
}

.row-actions {
    justify-content: flex-start;
}

.inline-actions {
    justify-content: flex-start;
    flex-wrap: wrap;
}

.inline-form {
    justify-content: flex-start;
    flex-wrap: wrap;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field span {
    font-weight: 600;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    font: inherit;
}

textarea {
    resize: vertical;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
}

.btn:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

.btn-secondary {
    background: #e7eef9;
    color: var(--text);
}

.btn-secondary:hover {
    background: #d5e2f7;
}

.btn-danger {
    background: #fee4e2;
    color: var(--danger);
}

.btn-danger:hover {
    background: #fdd4d0;
}

.btn-sm {
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 0.92rem;
}

.btn-block {
    width: 100%;
}

.badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 4px 10px;
    background: #ebf2ff;
    color: var(--primary-dark);
    font-size: 0.84rem;
    font-weight: 700;
}

.muted {
    color: var(--muted);
}

.mini-card,
.message-card {
    background: var(--surface-soft);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px;
}

.message-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
    margin: 20px 0;
}

.quote-box,
.code-block {
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 14px;
    padding: 16px;
    overflow-x: auto;
}

.quote-box {
    background: #eef4ff;
    color: var(--text);
    border: 1px solid var(--border);
    margin: 16px 0;
}

.code-block {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.88rem;
}

.table-wrap {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    text-align: left;
    padding: 12px 10px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.alert {
    margin: 0 0 16px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid transparent;
}

.alert-success {
    background: #e9fbf2;
    border-color: #b7ebcf;
    color: #0f6d46;
}

.alert-error {
    background: #fff1f0;
    border-color: #f5c2c0;
    color: #a23333;
}

.compact-list {
    margin: 8px 0 0;
    padding-left: 18px;
}

.form-grid,
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.checkbox-grid label {
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-card {
    width: min(460px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px;
    box-shadow: var(--shadow);
}

code {
    background: #eef2ff;
    padding: 2px 6px;
    border-radius: 8px;
}

pre {
    margin: 0;
}

@media (max-width: 1100px) {
    .content-grid,
    .content-grid-wide,
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: sticky;
        top: 0;
        z-index: 10;
    }
}

@media (max-width: 640px) {
    .main-content {
        padding: 16px;
    }

    .panel,
    .auth-card {
        padding: 18px;
    }

    .form-grid,
    .checkbox-grid {
        grid-template-columns: 1fr;
    }

    .row-between {
        flex-direction: column;
        align-items: flex-start;
    }
}