:root {
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --accent: #0E7490;
    --accent-light: #ECFEFF;
    --accent-hover: #0891B2;
    --border: #E2E8F0;
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --radius: 12px;
    --font-display: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    /* Level-2 accent of each skill family (see literacy-comprehension-handout-builder skill) */
    --skill-inferencing: #2F6F95;
    --skill-evaluation: #0E7490;
    --skill-reorganization: #6D5A9C;
}

[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --accent: #06B6D4;
    --accent-light: #083344;
    --accent-hover: #22D3EE;
    --border: #334155;
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.2), 0 2px 4px -2px rgb(0 0 0 / 0.2);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    padding: 2rem 1rem 3rem;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.site-header h1 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.02em;
}

.site-header .lede {
    color: var(--text-secondary);
    font-weight: 500;
    max-width: 40rem;
    margin-top: 0.35rem;
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 0.5rem;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb .sep {
    opacity: 0.5;
}

.btn {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-family: var(--font-display);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--card-shadow);
    text-decoration: none;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-primary {
    background-color: var(--accent);
    color: #FFFFFF;
    border-color: var(--accent);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #FFFFFF;
}

.theme-toggle {
    font-size: 1.25rem;
    padding: 0.5rem;
    width: 2.5rem;
    height: 2.5rem;
    justify-content: center;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

.nav-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    transition: border-color 0.2s, transform 0.2s;
    min-height: 160px;
}

.nav-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.nav-card.disabled,
.nav-card[aria-disabled="true"] {
    opacity: 0.72;
    cursor: default;
    pointer-events: none;
}

.nav-card:hover.disabled {
    transform: none;
    border-color: var(--border);
}

.nav-card .eyebrow {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.nav-card h2 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.nav-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex: 1;
}

.nav-card.skill-inferencing { border-top: 4px solid var(--skill-inferencing); }
.nav-card.skill-evaluation { border-top: 4px solid var(--skill-evaluation); }
.nav-card.skill-reorganization { border-top: 4px solid var(--skill-reorganization); }

.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.25rem;
}

.status {
    display: inline-flex;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-secondary);
}

.status.ready {
    background: #ECFDF5;
    border-color: #6EE7B7;
    color: #047857;
}

.status.content {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}

[data-theme="dark"] .status.ready {
    background: #064E3B;
    border-color: #10B981;
    color: #6EE7B7;
}

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
}

.panel h2 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.panel p,
.panel li {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.panel ul {
    margin: 0.5rem 0 0 1.25rem;
}

.handout-list {
    display: grid;
    gap: 0.75rem;
}

.handout-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    box-shadow: var(--card-shadow);
}

.handout-row .meta h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
}

.handout-row .meta p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.handout-row .actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

.site-footer {
    margin-top: 2.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

@media (max-width: 640px) {
    body { padding: 1rem 0.75rem 2rem; }
    .handout-row { align-items: flex-start; }
}