:root {
    --primary: #1e293b;
    --primary-dark: #0f172a;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --text: #1e293b;
    --text-light: #64748b;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --border: #e2e8f0;
    --max-width: 960px;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
}

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

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s ease;
}
a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

ul a, ol a {
    color: var(--text);
    text-decoration: none;
}
ul a:hover, ol a:hover {
    color: var(--accent);
}
ul, ol {
    padding: 0;
    margin: 0;
    line-height: 1.7;
    list-style-position: inside;
}
ul {
    list-style: none;
}

ul.slogan {
    list-style: none;
    margin: 0;
    padding: 0;
}
ul.slogan > li {
    padding: 0.25em 0 0.25em 1.2em;
    position: relative;
    color: var(--text-light);
    font-size: 0.95em;
}
ul.slogan > li:before {
    content: ">";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

h1 {
    font-size: 2em;
    font-weight: 700;
    letter-spacing: -0.02em;
}
h2 {
    font-size: 1.3em;
    font-weight: 600;
    letter-spacing: -0.01em;
}
h3 {
    font-size: 1.05em;
    font-weight: 600;
    margin-top: 2.5em;
}
h4 {
    text-transform: uppercase;
    font-size: 0.75em;
    letter-spacing: 0.05em;
    color: var(--text-light);
}
h4 code {
    font-size: 1.25em;
    text-transform: none;
}
img {
    max-width: 100%;
}
hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2em 0;
}

.wrapper {
    margin: 0 auto;
    max-width: var(--max-width);
    padding: 0 1em;
}
.row {
    display: flex;
    flex-wrap: wrap;
}
.column {
    min-width: 0;
}
.column-wrapper {
    padding: 2em 1em;
}
.column-75 {
    flex: 0 0 75%;
    max-width: 75%;
}
.column-75 .column-wrapper {
    padding-right: 3em;
}
.column-25 {
    flex: 0 0 25%;
    max-width: 25%;
}
.column-33 {
    flex: 0 0 33.333%;
    max-width: 33.333%;
}

/* Header */
header {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}
header, header a, header a:hover {
    color: #fff;
    text-decoration: none;
}
header .row {
    align-items: center;
    justify-content: space-between;
    padding: 0.75em 0;
}
header h1 {
    margin: 0;
    font-size: 1.4em;
    font-weight: 600;
}

#logo {
    display: flex;
    align-items: center;
}
#logo img {
    max-width: 36px;
    vertical-align: middle;
}
#logo a {
    display: flex;
    align-items: center;
    gap: 0.5em;
}
header nav ul {
    display: flex;
    gap: 0.25em;
    list-style: none;
    margin: 0;
    padding: 0;
}
header nav li a {
    display: inline-block;
    padding: 0.5em 0.75em;
    border-radius: var(--radius);
    font-size: 0.95em;
    font-weight: 500;
    transition: background 0.15s ease;
}
header nav li a:hover {
    background: rgba(255,255,255,0.1);
}
header nav li.selected a {
    background: rgba(255,255,255,0.15);
}

/* Sidebar nav */
.column-25 .selected {
    color: var(--accent);
    font-weight: 600;
}
.column-25 > div > ul {
    font-size: 0.95em;
    white-space: nowrap;
}
.selected, .selected a {
    cursor: default;
}
.column-25 .selected a:hover {
    border: none;
}
.nav > ul > .selected {
    background: var(--bg-alt);
    border-left: 3px solid var(--accent);
    padding-left: 0.5em;
    border-radius: 0 var(--radius) var(--radius) 0;
}

/* Table of contents */
.contents > li > a {
    color: var(--text-light);
}
#content > ul > li > a {
    color: var(--text-light);
}
.column-75 > a {
    color: var(--accent);
}
.contents {
    padding-bottom: 2em;
    margin-bottom: 2em;
    border-bottom: 1px solid var(--border);
}

/* Footer */
footer {
    margin-top: 3em;
}
footer .wrapper {
    border-top: 1px solid var(--border);
    text-align: center;
    padding: 2em 0;
}
footer p {
    color: var(--text-light);
    font-size: 0.9em;
    margin: 0.25em 0;
}
footer a {
    color: var(--text-light);
}
footer a:hover {
    color: var(--accent);
}

/* Hero */
#hero {
    text-align: center;
    max-width: 640px;
    margin: 3em auto 2em;
}
#hero p {
    color: rgba(255,255,255,0.85);
    font-size: 1.1em;
    line-height: 1.7;
}
#hero h2 {
    font-size: 2.5em;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    color: #fff;
}

.show-on-mobile {
    display: none;
}

/* Feature cards */
.column-33 .column-wrapper {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin: 0 0.5em;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.column-33 .column-wrapper:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.column-33 h2 {
    color: var(--primary);
    margin-top: 0;
}
.column-33 p {
    color: var(--text-light);
    font-size: 0.95em;
}
.column-33 li:before {
    content: "";
}

/* Getting started */
#easy-start {
    padding-top: 1em;
    text-align: center;
}
#easy-start > p {
    color: var(--text-light);
    font-size: 1.05em;
}
#easy-start .bash {
    background: var(--primary-dark);
    color: #e2e8f0;
    border-radius: var(--radius);
    padding: 1.5em 2em;
    line-height: 1.7;
    text-align: left;
    font-size: 0.95em;
    box-shadow: var(--shadow-md);
}
#easy-start > .bash .cmd, #easy-start .bash .hljs-string {
    color: #67e8f9;
}
#easy-start > .bash .hljs-number, #easy-start .bash .hljs-keyword {
    color: #e2e8f0;
}
.markdown .hljs-link_label {
    color: var(--text-light);
}

/* Code blocks in docs */
pre {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1em 1.25em;
    overflow-x: auto;
    font-size: 0.9em;
    line-height: 1.5;
}
code {
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Menlo, Consolas, monospace;
    font-size: 0.9em;
}
p code, li code {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15em 0.35em;
    font-size: 0.85em;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .column {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .column-75, .column-25 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .column-75 .column-wrapper {
        padding-right: 1em;
    }
    .column-33 .column-wrapper {
        margin: 0.5em 0;
    }
    .column-wrapper {
        padding-top: 1em;
        padding-bottom: 1em;
    }
    .show-on-mobile {
        display: initial;
    }
    .hide-on-mobile {
        display: none;
    }
    #hero h2 {
        font-size: 1.8em;
    }
    header .row {
        flex-direction: column;
        gap: 0.5em;
    }
}