:root {
    --navy: #1B3A5C;
    --blue: #2563A8;
    --teal: #1A7A8C;
    --green: #1A7A4A;
    --orange: #B85C00;
    --red: #A02020;
    --grey: #F5F7FA;
    --dgrey: #4A5568;
    --white: #FFFFFF;
    --black: #111827;
    --border: #D0D5DD;
    --code-bg: #0F172A;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--black);
    background: #F0F4F8;
}

/* Layout */
.layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 270px;
    min-width: 270px;
    background: var(--navy);
    color: #CBD5E0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    padding: 0 0 40px;
}

.sidebar-logo {
    background: #0F2440;
    padding: 22px 20px 18px;
    border-bottom: 3px solid var(--teal);
}

.sidebar-logo h1 {
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: .5px;
}

.sidebar-logo p {
    color: #90A4BF;
    font-size: .75rem;
    margin-top: 3px;
}

.sidebar nav {
    padding: 14px 0;
}

.sidebar nav a {
    display: block;
    padding: 7px 22px;
    color: #A8BCCF;
    text-decoration: none;
    font-size: .82rem;
    transition: all .15s;
    border-left: 3px solid transparent;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    color: #fff;
    background: rgba(255, 255, 255, .07);
    border-left-color: var(--teal);
}

.sidebar nav .section-label {
    padding: 14px 22px 5px;
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    color: #4A6785;
}

/* Main content */
.main {
    flex: 1;
    min-width: 0;
    padding: 0 0 80px;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--navy) 0%, #254E7A 100%);
    color: #fff;
    padding: 48px 56px 44px;
    border-bottom: 4px solid var(--teal);
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    right: -40px;
    top: -40px;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .04);
}

.hero h1 {
    font-size: 2.1rem;
    font-weight: 800;
    letter-spacing: -.5px;
}

.hero .subtitle {
    color: #90B8D8;
    margin-top: 8px;
    font-size: 1rem;
}

.hero .meta {
    display: flex;
    gap: 24px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.hero .badge {
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .2);
    border-radius: 20px;
    padding: 4px 14px;
    font-size: .78rem;
    color: #CBD5E0;
}

/* Sections */
.section {
    padding: 44px 56px 12px;
    max-width: 920px;
}

.section+.section {
    padding-top: 10px;
}

h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--navy);
    padding-bottom: 10px;
    border-bottom: 2px solid var(--teal);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

h2 .num {
    background: var(--teal);
    color: #fff;
    font-size: .75rem;
    font-weight: 700;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--navy);
    margin: 28px 0 10px;
}

h4 {
    font-size: .9rem;
    font-weight: 700;
    color: var(--dgrey);
    margin: 20px 0 8px;
}

p {
    margin-bottom: 12px;
    color: #2D3748;
}

/* Code */
pre {
    background: var(--code-bg);
    color: #E2E8F0;
    border-radius: 8px;
    padding: 16px 20px;
    font-size: .82rem;
    line-height: 1.6;
    overflow-x: auto;
    margin: 10px 0 16px;
    border-left: 3px solid var(--teal);
}

code {
    font-family: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
}

p code,
li code,
td code {
    background: #EDF2F7;
    color: #1A7A8C;
    padding: 1px 6px;
    border-radius: 4px;
    font-size: .83em;
}

.comment {
    color: #64748B;
}

.cmd {
    color: #7DD3FC;
}

.arg {
    color: #86EFAC;
}

.flag {
    color: #FCA5A5;
}

.str {
    color: #FDE68A;
}

/* Tables */
.tbl-wrap {
    overflow-x: auto;
    margin: 12px 0 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: .85rem;
}

thead tr {
    background: var(--navy);
    color: #fff;
}

thead th {
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: .8rem;
    letter-spacing: .3px;
}

tbody tr:nth-child(even) {
    background: var(--grey);
}

tbody tr:hover {
    background: #E8EFF7;
}

td {
    padding: 9px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

td:first-child {
    font-weight: 500;
}

/* Callouts */
.callout {
    border-radius: 8px;
    padding: 14px 18px;
    margin: 14px 0;
    font-size: .88rem;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.callout .icon {
    flex-shrink: 0;
    font-size: 1rem;
    margin-top: 1px;
}

.callout.tip {
    background: #EBF8F5;
    border-left: 4px solid var(--teal);
}

.callout.warn {
    background: #FFF7ED;
    border-left: 4px solid var(--orange);
}

.callout.danger {
    background: #FEF2F2;
    border-left: 4px solid var(--red);
}

.callout.info {
    background: #EFF6FF;
    border-left: 4px solid var(--blue);
}

.callout p {
    margin: 0;
    color: inherit;
}

/* Step list */
.steps {
    counter-reset: step;
    list-style: none;
    margin: 10px 0 16px;
}

.steps li {
    counter-increment: step;
    display: flex;
    gap: 14px;
    margin-bottom: 14px;
    align-items: flex-start;
}

.steps li::before {
    content: counter(step);
    background: var(--blue);
    color: #fff;
    font-size: .75rem;
    font-weight: 700;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Command reference grid */
.cmd-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 10px;
    margin: 12px 0 20px;
}

.cmd-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.cmd-card code {
    font-size: .85rem;
    color: var(--teal);
    font-weight: 600;
}

.cmd-card span {
    font-size: .8rem;
    color: var(--dgrey);
}

/* Quick ref */
.quick-ref {
    background: var(--navy);
    color: #CBD5E0;
    border-radius: 10px;
    padding: 28px 32px;
    margin: 20px 0;
}

.quick-ref h3 {
    color: #fff;
    margin-top: 0;
    border-bottom: 1px solid rgba(255, 255, 255, .15);
    padding-bottom: 10px;
    margin-bottom: 16px;
}

.quick-ref table {
    font-size: .82rem;
}

.quick-ref thead tr {
    background: rgba(255, 255, 255, .1);
}

.quick-ref thead th {
    color: #90B8D8;
}

.quick-ref tbody tr {
    background: transparent;
}

.quick-ref tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, .05);
}

.quick-ref tbody tr:hover {
    background: rgba(255, 255, 255, .08);
}

.quick-ref td {
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    color: #CBD5E0;
}

.quick-ref td:first-child {
    color: #fff;
}

.quick-ref td code {
    background: rgba(255, 255, 255, .1);
    color: #7DD3FC;
}

/* RAID cards */
.raid-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    margin: 12px 0 20px;
}

.raid-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    border-top: 3px solid var(--blue);
}

.raid-card.recommended {
    border-top-color: var(--green);
}

.raid-card.caution {
    border-top-color: var(--orange);
}

.raid-card h4 {
    margin: 0 0 6px;
    color: var(--navy);
    font-size: .9rem;
}

.raid-card .badge-sm {
    display: inline-block;
    font-size: .68rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
    margin-bottom: 8px;
}

.badge-green {
    background: #D1FAE5;
    color: #065F46;
}

.badge-orange {
    background: #FEF3C7;
    color: #92400E;
}

.badge-grey {
    background: #F3F4F6;
    color: #374151;
}

.raid-card p {
    font-size: .8rem;
    color: var(--dgrey);
    margin: 0;
}

/* Disaster recovery highlight */
.dr-box {
    background: linear-gradient(135deg, #EFF6FF, #E0F2FE);
    border: 1px solid #93C5FD;
    border-radius: 10px;
    padding: 24px 28px;
    margin: 16px 0;
}

.dr-box h3 {
    color: var(--navy);
    margin-top: 0;
}

.dr-box .steps li::before {
    background: var(--blue);
}

/* Footer */
.footer {
    background: var(--navy);
    color: #4A6785;
    text-align: center;
    padding: 18px;
    font-size: .78rem;
    margin-top: 40px;
}

.footer span {
    color: var(--teal);
}

/* Print */
@media print {
    .sidebar {
        display: none;
    }

    .hero {
        print-color-adjust: exact;
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .hero,
    .section {
        padding-left: 20px;
        padding-right: 20px;
    }
}