/* The 9 Elements of Digital Citizenship — James Nowlin, INFO 5347 */
/* Refined dark theme: Nord-inspired, self-hosted Inter. */

@font-face {
    font-family: 'Inter';
    src: url('fonts/InterVariable.woff2') format('woff2-variations');
    font-weight: 100 900;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('fonts/InterVariable-Italic.woff2') format('woff2-variations');
    font-weight: 100 900;
    font-style: italic;
    font-display: swap;
}

:root {
    --bg: #232830;
    --bg-raised: #2b313b;
    --bg-card: #303845;
    --border: #434c5e;
    --border-soft: #3a4353;
    --text: #eceff4;
    --text-dim: #b9c2d2;
    --text-faint: #8b95a8;
    --accent: #88c0d0;
    --accent-soft: rgba(136, 192, 208, 0.12);
    --accent-violet: #b48ead;
    --accent-warm: #ebcb8b;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    display: flex;
    min-height: 100vh;
    font-size: 1rem;
    -webkit-font-smoothing: antialiased;
}

/* ---------- Sidebar ---------- */

.sidebar {
    width: 300px;
    flex-shrink: 0;
    background-color: var(--bg-raised);
    border-right: 1px solid var(--border-soft);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 10;
}

.sidebar-header {
    padding: 2.25rem 1.75rem 1.75rem;
    border-bottom: 1px solid var(--border-soft);
}

.brand-eyebrow {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.6rem;
}

.sidebar-header h1 {
    font-size: 1.28rem;
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: -0.01em;
}

.sidebar-header h1 a {
    color: var(--text);
    text-decoration: none;
}

.sidebar-header h1 a:hover {
    color: var(--accent);
}

.brand-sub {
    margin-top: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-faint);
}

.menu-links {
    display: flex;
    flex-direction: column;
    padding: 1rem 0.75rem;
    flex: 1;
}

.menu-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 500;
    padding: 0.62rem 0.9rem;
    border-radius: 8px;
    display: flex;
    align-items: baseline;
    gap: 0.7rem;
    transition: background-color 0.18s ease, color 0.18s ease;
}

.menu-links a:hover {
    background-color: var(--bg-card);
    color: var(--text);
}

.menu-links a.active {
    background-color: var(--accent-soft);
    color: var(--accent);
    font-weight: 700;
}

.nav-num {
    font-size: 0.72rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--text-faint);
    min-width: 1.6rem;
}

.menu-links a.active .nav-num {
    color: var(--accent);
}

.sidebar-foot {
    padding: 1rem 1.75rem;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-faint);
    border-top: 1px solid var(--border-soft);
}

/* ---------- Main layout ---------- */

main {
    flex: 1;
    margin-left: 300px;
    padding: 0;
    max-width: calc(100% - 300px);
}

main > *:not(.site-footer) {
    max-width: 1060px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 3rem;
    padding-right: 3rem;
}

.site-footer {
    max-width: 1060px;
    margin: 4rem auto 0;
    padding: 1.75rem 3rem 2.5rem;
    border-top: 1px solid var(--border-soft);
}

.site-footer p {
    font-size: 0.85rem;
    color: var(--text-faint);
    text-align: center;
    letter-spacing: 0.02em;
}

/* ---------- Hero (index) ---------- */

.hero {
    padding-top: 4.5rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--border-soft);
    margin-bottom: 3rem;
    position: relative;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-violet) 55%, var(--accent-warm) 100%);
}

.hero-eyebrow {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.25rem;
}

.hero-title {
    font-size: 3.4rem;
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.hero-sub {
    font-size: 1.25rem;
    color: var(--text-dim);
    font-weight: 400;
}

/* ---------- Intro / sections ---------- */

.intro {
    margin-bottom: 3.5rem;
}

.intro p {
    font-size: 1.08rem;
    color: var(--text-dim);
    margin-bottom: 1.25rem;
    max-width: 68ch;
}

.intro p:last-child {
    margin-bottom: 0;
}

.section-heading {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
}

.section-lede {
    color: var(--text-dim);
    font-size: 1.02rem;
    margin-bottom: 1.75rem;
    max-width: 68ch;
}

.count {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-faint);
}

/* ---------- S3 framework ---------- */

.s3 {
    margin-bottom: 3.5rem;
}

.pillar-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.pillar-card {
    background-color: var(--bg-raised);
    border: 1px solid var(--border-soft);
    border-radius: 12px;
    padding: 1.5rem;
}

.pillar-card h3 {
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.pillar-card p {
    font-size: 0.93rem;
    color: var(--text-dim);
    margin-bottom: 1rem;
}

.pillar-elements {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.mini-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dim);
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.22rem 0.7rem;
    white-space: nowrap;
}

/* ---------- Element cards (index grid) ---------- */

.elements-index {
    margin-bottom: 1rem;
}

.elements-index .section-heading {
    margin-bottom: 1.5rem;
}

.element-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.element-card {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-raised);
    border: 1px solid var(--border-soft);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.element-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: var(--shadow);
}

.element-card h3 {
    font-size: 1.08rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.35;
    margin: 0.8rem 0 0.5rem;
}

.element-card > p {
    font-size: 0.9rem;
    color: var(--text-dim);
    flex: 1;
    margin-bottom: 1rem;
}

.card-link {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
}

.card-link .arrow {
    display: inline-block;
    transition: transform 0.2s ease;
}

.element-card:hover .card-link .arrow {
    transform: translateX(4px);
}

/* ---------- Badges & pillar tags ---------- */

.element-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.1rem;
    height: 2.1rem;
    padding: 0 0.55rem;
    border-radius: 8px;
    background-color: rgba(180, 142, 173, 0.14);
    border: 1px solid rgba(180, 142, 173, 0.45);
    color: var(--accent-violet);
    font-size: 0.82rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
}

.pillar-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.28rem 0.75rem;
    border-radius: 999px;
    margin-left: 0.6rem;
    vertical-align: middle;
}

.pillar-safety {
    color: #d08770;
    background-color: rgba(208, 135, 112, 0.12);
    border: 1px solid rgba(208, 135, 112, 0.4);
}

.pillar-savvy {
    color: var(--accent);
    background-color: var(--accent-soft);
    border: 1px solid rgba(136, 192, 208, 0.4);
}

.pillar-social {
    color: var(--accent-warm);
    background-color: rgba(235, 203, 139, 0.1);
    border: 1px solid rgba(235, 203, 139, 0.4);
}

/* ---------- Element pages ---------- */

.element-hero {
    padding-top: 3.5rem;
    margin-bottom: 2rem;
}

.element-hero .page-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    line-height: 1.15;
    margin-top: 1.1rem;
}

.definition {
    border-left: 3px solid var(--accent);
    background-color: var(--bg-raised);
    border-radius: 0 12px 12px 0;
    padding: 1.5rem 1.75rem;
    margin: 0 0 3rem;
}

.definition p {
    font-size: 1.08rem;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.definition cite {
    font-style: normal;
    font-size: 0.85rem;
    color: var(--text-faint);
}

/* ---------- Resource cards ---------- */

.link-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.link-box {
    background-color: var(--bg-raised);
    border: 1px solid var(--border-soft);
    border-radius: 12px;
    padding: 1.4rem 1.5rem;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.link-box:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: var(--shadow);
}

.link-box h3 {
    font-size: 1.02rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.6rem;
}

.link-box h3 a {
    color: var(--accent);
    text-decoration: none;
}

.link-box h3 a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.link-box p {
    font-size: 0.9rem;
    color: var(--text-dim);
}

/* ---------- Focus & selection ---------- */

a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

::selection {
    background-color: rgba(136, 192, 208, 0.3);
}

/* ---------- Responsive ---------- */

@media (max-width: 1100px) {
    .element-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border-soft);
        max-height: none;
    }

    .sidebar-header {
        padding: 1.5rem;
    }

    .menu-links {
        flex-direction: row;
        overflow-x: auto;
        padding: 0.6rem;
        gap: 0.25rem;
    }

    .menu-links a {
        white-space: nowrap;
        padding: 0.55rem 0.85rem;
    }

    .sidebar-foot {
        display: none;
    }

    main {
        margin-left: 0;
        max-width: 100%;
    }

    main > *:not(.site-footer) {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .site-footer {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .hero {
        padding-top: 3rem;
    }

    .hero-title {
        font-size: 2.4rem;
    }

    .element-hero {
        padding-top: 2.5rem;
    }

    .element-hero .page-title {
        font-size: 1.9rem;
    }

    .element-grid {
        grid-template-columns: 1fr;
    }

    .link-boxes {
        grid-template-columns: 1fr;
    }
}