/*
Theme Name:     Cloud AI Campus
Theme URI:      https://cloudaicampus.com
Author:         Cloud AI Campus
Description:    Coursera-inspired light theme for cloudaicampus.com. White surfaces, calm blue primary, Inter typography. The lab workspace's terminal pane is the only dark exception.
Version:        0.2.0
Requires at least: 6.4
Requires PHP:   8.1
License:        Proprietary
Text Domain:    cloudaicampus
Tags:           light, custom-colors, custom-fonts, education
*/

/* ============================================================
 * Design tokens — see MASTER_PROMPT.md §4
 * ============================================================ */

:root {
    /* Light palette */
    --cac-bg:           #ffffff;
    --cac-surface:      #ffffff;
    --cac-surface-alt:  #f6f8fb;
    --cac-border:       #e2e8f0;
    --cac-border-hi:    #cbd5e1;

    --cac-primary:      #0056d2;
    --cac-primary-hi:   #003e99;
    --cac-primary-soft: #e6efff;

    --cac-text:         #0f172a;
    --cac-text-muted:   #475569;
    --cac-text-dim:     #94a3b8;

    --cac-success:      #16a34a;
    --cac-warning:      #d97706;
    --cac-danger:       #dc2626;

    /* Lab terminal — the ONE dark exception (used only inside .cac-lab__pane) */
    --cac-term-bg:      #0a0e1a;
    --cac-term-fg:      #e8eaf3;
    --cac-term-cursor:  #60a5fa;
    --cac-term-tab-bg:  #0f172a;

    /* Type */
    --cac-font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --cac-font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    /* Motion */
    --cac-ease:     cubic-bezier(0.22, 1, 0.36, 1);
    --cac-dur-fast: 120ms;
    --cac-dur:      200ms;

    /* Radii + shadows */
    --cac-radius-sm:  6px;
    --cac-radius:     8px;
    --cac-radius-lg:  12px;
    --cac-shadow-sm:  0 1px 2px rgba(15, 23, 42, 0.06);
    --cac-shadow:     0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.04);
    --cac-shadow-lg:  0 10px 30px rgba(15, 23, 42, 0.08);
    --cac-ring:       0 0 0 3px rgba(0, 86, 210, 0.25);
}

/* ============================================================
 * Base
 * ============================================================ */

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

html { background: var(--cac-bg); }

body {
    margin: 0;
    background: var(--cac-bg);
    color: var(--cac-text);
    font-family: var(--cac-font-sans);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--cac-font-sans);
    font-weight: 700;
    color: var(--cac-text);
    line-height: 1.25;
    margin: 0 0 0.5em;
}
h1 { font-size: clamp(32px, 4vw, 48px); letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 3vw, 32px); letter-spacing: -0.01em; }
h3 { font-size: 20px; }
p  { margin: 0 0 1em; }

a { color: var(--cac-primary); text-decoration: none; transition: color var(--cac-dur-fast) var(--cac-ease); }
a:hover { color: var(--cac-primary-hi); }
a:focus-visible { outline: none; box-shadow: var(--cac-ring); border-radius: var(--cac-radius-sm); }

code, pre, kbd, samp { font-family: var(--cac-font-mono); }
code { background: var(--cac-surface-alt); padding: 2px 6px; border-radius: var(--cac-radius-sm); font-size: 0.9em; color: var(--cac-text); }
pre { background: var(--cac-surface-alt); border: 1px solid var(--cac-border); border-radius: var(--cac-radius); padding: 14px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.55; }
pre code { background: transparent; padding: 0; }

img { max-width: 100%; height: auto; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================================
 * Layout primitives
 * ============================================================ */

.cac-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.cac-muted     { color: var(--cac-text-muted); }
.cac-section   { padding: clamp(48px, 8vw, 96px) 0; }
.cac-section--alt { background: var(--cac-surface-alt); }

/* ---- Site header ---- */
.cac-site-header { padding: 16px 0; border-bottom: 1px solid var(--cac-border); background: var(--cac-bg); position: sticky; top: 0; z-index: 10; }
.cac-site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.cac-brand { display: inline-flex; align-items: center; gap: 12px; color: var(--cac-text); font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
.cac-brand:hover { color: var(--cac-text); }
.cac-brand__mark { width: 30px; height: 30px; border-radius: 8px; background: var(--cac-primary); display: inline-flex; align-items: center; justify-content: center; box-shadow: var(--cac-shadow-sm); }
.cac-brand__mark::before { content: ''; display: block; width: 14px; height: 14px; border-radius: 50%; background: #ffffff; box-shadow: inset 4px -2px 0 var(--cac-primary); }
.cac-brand__text { font-family: var(--cac-font-sans); }

.cac-nav__list { display: flex; gap: 24px; list-style: none; margin: 0; padding: 0; align-items: center; }
.cac-nav__list a { color: var(--cac-text-muted); font-weight: 500; font-size: 14.5px; }
.cac-nav__list a:hover { color: var(--cac-primary); }

/* ---- Hero ---- */
.cac-hero {
    padding: clamp(56px, 9vw, 112px) 0 clamp(40px, 7vw, 80px);
    background:
        radial-gradient(ellipse at 80% -10%, rgba(0, 86, 210, 0.10), transparent 50%),
        radial-gradient(ellipse at 0% 30%,   rgba(0, 86, 210, 0.06), transparent 55%),
        var(--cac-bg);
    border-bottom: 1px solid var(--cac-border);
}
.cac-hero__inner { max-width: 880px; }
.cac-hero__eyebrow {
    margin: 0 0 12px;
    color: var(--cac-primary);
    text-transform: uppercase; letter-spacing: 0.12em;
    font-size: 12px; font-weight: 700;
}
.cac-hero__title {
    font-size: clamp(36px, 5.5vw, 60px);
    margin: 0 0 20px;
    letter-spacing: -0.03em;
    line-height: 1.05;
}
.cac-hero__tagline {
    font-size: clamp(16px, 1.6vw, 20px);
    color: var(--cac-text-muted);
    margin: 0 0 32px;
    max-width: 56ch;
    line-height: 1.55;
}
.cac-hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---- Section heads + page heads ---- */
.cac-section-head {
    display: flex; align-items: baseline; justify-content: space-between;
    gap: 16px; flex-wrap: wrap;
    margin-bottom: 32px;
}
.cac-section-head__title { font-size: clamp(24px, 3vw, 32px); margin: 0; }
.cac-section-head__link {
    color: var(--cac-primary); font-weight: 600; font-size: 14.5px;
}
.cac-section-head__link:hover { color: var(--cac-primary-hi); }

.cac-page-head { max-width: 720px; margin-bottom: 48px; }
.cac-page-head__eyebrow {
    margin: 0 0 12px; color: var(--cac-primary);
    text-transform: uppercase; letter-spacing: 0.12em;
    font-size: 12px; font-weight: 700;
}
.cac-page-head__title { font-size: clamp(32px, 4vw, 44px); margin: 0 0 16px; letter-spacing: -0.02em; }
.cac-page-head__lede  { font-size: 18px; color: var(--cac-text-muted); margin: 0; }

/* ---- Feature grid (three columns) ---- */
.cac-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}
.cac-feature {
    background: var(--cac-bg);
    border: 1px solid var(--cac-border);
    border-radius: var(--cac-radius-lg);
    padding: 28px 24px;
    box-shadow: var(--cac-shadow-sm);
    display: flex; flex-direction: column; gap: 12px;
}
.cac-feature__icon {
    width: 44px; height: 44px;
    border-radius: var(--cac-radius);
    background: var(--cac-primary-soft);
    color: var(--cac-primary);
    display: inline-flex; align-items: center; justify-content: center;
}
.cac-feature__icon svg { width: 22px; height: 22px; }
.cac-feature__title { font-size: 17px; margin: 0; font-weight: 600; }
.cac-feature__body  { margin: 0; color: var(--cac-text-muted); font-size: 14.5px; line-height: 1.6; }

/* ---- Card eyebrow + cta affordance ---- */
.cac-card__eyebrow {
    margin: 0 0 6px;
    color: var(--cac-primary);
    text-transform: uppercase; letter-spacing: 0.08em;
    font-size: 11px; font-weight: 700;
}
.cac-card__cta {
    display: inline-flex; gap: 4px; align-items: center;
    color: var(--cac-primary); font-weight: 600; font-size: 14px;
    margin-top: 14px;
    transition: gap var(--cac-dur) var(--cac-ease);
}
.cac-card:hover .cac-card__cta { gap: 8px; }

/* ---- Bottom CTA band ---- */
.cac-cta {
    margin: 64px 0 80px;
    padding: 64px 24px;
    background: linear-gradient(135deg, #003e99 0%, var(--cac-primary) 100%);
    color: #ffffff;
    text-align: center;
    border-radius: 0;
}
.cac-cta__inner { max-width: 720px; text-align: center; }
.cac-cta__title { font-size: clamp(28px, 3.5vw, 40px); margin: 0 0 12px; color: #ffffff; letter-spacing: -0.02em; }
.cac-cta__body  { font-size: 17px; color: rgba(255, 255, 255, 0.85); margin: 0 0 28px; }
.cac-cta .cac-button--primary {
    background: #ffffff; color: var(--cac-primary);
}
.cac-cta .cac-button--primary:hover:not([disabled]) {
    background: rgba(255, 255, 255, 0.9); color: var(--cac-primary-hi);
}

.cac-button--lg { padding: 14px 28px; font-size: 16px; }

/* ---- Buttons ---- */
.cac-button {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--cac-radius);
    border: 1px solid transparent;
    background: transparent;
    color: var(--cac-text);
    font-family: inherit; font-weight: 600; font-size: 14.5px;
    cursor: pointer;
    transition: background var(--cac-dur) var(--cac-ease), color var(--cac-dur) var(--cac-ease), box-shadow var(--cac-dur) var(--cac-ease), border-color var(--cac-dur) var(--cac-ease);
    line-height: 1.2;
}
.cac-button:focus-visible { outline: none; box-shadow: var(--cac-ring); }
.cac-button[disabled]     { opacity: 0.45; cursor: not-allowed; }

.cac-button--primary { background: var(--cac-primary); color: #ffffff; }
.cac-button--primary:hover:not([disabled]) { background: var(--cac-primary-hi); color: #ffffff; }

.cac-button--secondary { background: var(--cac-surface); color: var(--cac-text); border-color: var(--cac-border); }
.cac-button--secondary:hover:not([disabled]) { border-color: var(--cac-border-hi); background: var(--cac-surface-alt); }

.cac-button--ghost { background: transparent; color: var(--cac-primary); }
.cac-button--ghost:hover:not([disabled]) { background: var(--cac-primary-soft); }

/* ---- Cards / catalog ---- */
.cac-card-grid {
    list-style: none; padding: 0; margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.cac-card {
    background: var(--cac-surface);
    border: 1px solid var(--cac-border);
    border-radius: var(--cac-radius-lg);
    padding: 24px;
    transition: border-color var(--cac-dur) var(--cac-ease), box-shadow var(--cac-dur) var(--cac-ease), transform var(--cac-dur) var(--cac-ease);
    box-shadow: var(--cac-shadow-sm);
}
.cac-card:hover {
    border-color: var(--cac-border-hi);
    box-shadow: var(--cac-shadow-lg);
    transform: translateY(-2px);
}
.cac-card__link    { color: inherit; display: block; }
.cac-card__link:hover { color: inherit; }
.cac-card__title   { font-size: 18px; font-weight: 600; margin: 0 0 8px; color: var(--cac-text); }
.cac-card__excerpt { color: var(--cac-text-muted); margin: 0; font-size: 14.5px; line-height: 1.55; }
.cac-card__meta    { color: var(--cac-text-dim); font-size: 13px; margin-top: 12px; }

/* ---- Footer ---- */
.cac-site-footer { padding: 40px 0; border-top: 1px solid var(--cac-border); color: var(--cac-text-muted); margin-top: 64px; background: var(--cac-surface-alt); }
.cac-site-footer__inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.cac-site-footer__copy { margin: 0; font-size: 14px; }

/* ============================================================
 * Lab template (scenario.php / single-lesson.php) — split screen.
 *
 * Left rail (lesson markdown + steps) is light. Right pane (terminal
 * workspace) is dark — the master-prompt exception. The two sit side
 * by side so the visual contrast is clear and the boundary obvious.
 * ============================================================ */

.cac-lab {
    display: grid;
    grid-template-columns: minmax(360px, 40%) 1fr;
    min-height: calc(100vh - 64px);
}
@media (max-width: 900px) { .cac-lab { grid-template-columns: 1fr; } }

/* ---- Left: lesson rail (light) ---- */
.cac-lab__lesson {
    padding: 32px 28px;
    overflow-y: auto;
    background: var(--cac-bg);
    border-right: 1px solid var(--cac-border);
    display: flex; flex-direction: column; gap: 20px;
}
.cac-lab__lesson-header { display: flex; flex-direction: column; gap: 12px; }
.cac-lab__breadcrumb {
    margin: 0; color: var(--cac-primary);
    text-transform: uppercase; letter-spacing: 0.06em;
    font-size: 11px; font-weight: 700;
}
.cac-lab__title { margin: 0; font-size: 26px; letter-spacing: -0.02em; }

.cac-lab__steps { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-direction: column; gap: 6px; }
.cac-lab__step {
    padding: 10px 14px;
    border: 1px solid var(--cac-border);
    border-radius: var(--cac-radius);
    color: var(--cac-text-muted);
    font-size: 14px;
    font-weight: 500;
    background: var(--cac-surface);
    display: flex; align-items: center; gap: 8px;
}
.cac-lab__step-num { color: var(--cac-text-dim); font-variant-numeric: tabular-nums; font-weight: 600; }
.cac-lab__step--active {
    color: var(--cac-primary-hi);
    border-color: var(--cac-primary);
    background: var(--cac-primary-soft);
}
.cac-lab__step--active .cac-lab__step-num { color: var(--cac-primary); }
.cac-lab__step--done {
    color: var(--cac-success);
    border-color: color-mix(in oklab, var(--cac-success) 60%, var(--cac-border));
}
.cac-lab__step--done .cac-lab__step-num::before {
    content: "✓ ";
    margin-right: 2px;
}

@keyframes cac-shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}
.cac-button--shake { animation: cac-shake 0.55s var(--cac-ease); }

.cac-lab__content { line-height: 1.65; color: var(--cac-text); }
.cac-lab__content h1 { font-size: 24px; margin: 24px 0 12px; }
.cac-lab__content h2 { font-size: 20px; margin: 24px 0 12px; }
.cac-lab__content h3 { font-size: 17px; margin: 20px 0 8px; }
.cac-lab__content p  { margin: 0 0 14px; }
.cac-lab__content ul, .cac-lab__content ol { padding-left: 22px; margin: 0 0 14px; }
.cac-lab__content li { margin-bottom: 6px; }
.cac-lab__content pre { background: var(--cac-surface-alt); border: 1px solid var(--cac-border); position: relative; padding-right: 130px; }
.cac-lab__content code { background: var(--cac-surface-alt); }

/* "Run in terminal" affordance on every <pre> in the lesson rail. */
.cac-copy-to-term {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    border: 1px solid var(--cac-primary);
    background: var(--cac-bg);
    color: var(--cac-primary);
    border-radius: 999px;
    font-family: var(--cac-font-sans);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    opacity: 0.75;
    transition: opacity var(--cac-dur-fast), background var(--cac-dur-fast), color var(--cac-dur-fast);
}
.cac-lab__content pre:hover .cac-copy-to-term { opacity: 1; }
.cac-copy-to-term:hover { background: var(--cac-primary); color: #ffffff; }

.cac-lab__hint { margin-top: 16px; border: 1px solid var(--cac-border); border-radius: var(--cac-radius); padding: 10px 14px; background: var(--cac-surface-alt); }
.cac-lab__hint summary { cursor: pointer; font-weight: 600; color: var(--cac-text); list-style: none; }
.cac-lab__hint summary::-webkit-details-marker { display: none; }
.cac-lab__hint[open] summary { margin-bottom: 8px; }
.cac-lab__hint p { margin: 0; color: var(--cac-text-muted); }

.cac-lab__verify {
    margin-top: auto;
    display: flex; align-items: center; gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--cac-border);
}

/* ---- Right: workspace (dark — the one allowed exception) ---- */
.cac-lab__workspace {
    display: flex; flex-direction: column;
    background: var(--cac-term-tab-bg);
    color: var(--cac-term-fg);
}
.cac-lab__tabs {
    display: flex; gap: 4px;
    padding: 8px 8px 0;
    background: var(--cac-term-tab-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.cac-lab__tab {
    padding: 8px 14px;
    border: none;
    background: transparent;
    color: #94a3b8;
    font-family: inherit; font-size: 13px; font-weight: 500;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color var(--cac-dur-fast), border-color var(--cac-dur-fast), background var(--cac-dur-fast);
}
.cac-lab__tab:hover:not([disabled]) { color: #e2e8f0; background: rgba(255, 255, 255, 0.04); }
.cac-lab__tab--active { color: #ffffff; border-bottom-color: var(--cac-term-cursor); }
.cac-lab__tab[disabled] { opacity: 0.35; cursor: not-allowed; }

.cac-lab__tab-close {
    display: inline-block; margin-left: 8px; padding: 0 4px;
    border-radius: 4px; line-height: 1; opacity: 0.6;
}
.cac-lab__tab-close:hover { opacity: 1; background: rgba(255, 255, 255, 0.12); }

.cac-lab__tab--add {
    color: #94a3b8; padding: 8px 12px;
    border-bottom: none !important;
}
.cac-lab__tab--add:hover { color: #ffffff !important; }

.cac-lab__panes { flex: 1; display: flex; flex-direction: column; min-height: 0; background: var(--cac-term-bg); }
.cac-lab__pane  { flex: 1; padding: 12px; background: var(--cac-term-bg); display: flex; flex-direction: column; min-height: 0; }
.cac-lab__pane[hidden] { display: none; }
.cac-lab__pane--light { background: #ffffff; color: var(--cac-text); padding: 0; }

.cac-lab__terminal { width: 100%; height: 100%; min-height: 480px; }
.cac-lab__terminal .xterm { background: var(--cac-term-bg); }

/* ---- Editor pane ---- */
.cac-lab__editor-toolbar {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 12px;
    background: var(--cac-surface-alt);
    border-bottom: 1px solid var(--cac-border);
}
.cac-lab__editor-path {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--cac-border);
    border-radius: var(--cac-radius-sm);
    font-family: var(--cac-font-mono);
    font-size: 13px;
    background: var(--cac-bg);
    color: var(--cac-text);
}
.cac-lab__editor-path:focus { outline: none; border-color: var(--cac-primary); box-shadow: var(--cac-ring); }
.cac-lab__editor-status { margin-left: auto; font-size: 12px; }
.cac-lab__editor { flex: 1; min-height: 480px; }

/* ---- Preview pane ---- */
.cac-lab__preview-toolbar {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 12px;
    background: var(--cac-term-tab-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #94a3b8;
}
.cac-lab__preview-port {
    width: 90px; padding: 6px 10px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--cac-radius-sm);
    font-family: var(--cac-font-mono); font-size: 13px;
    background: rgba(255, 255, 255, 0.05); color: #e8eaf3;
}
.cac-lab__preview-iframe {
    flex: 1; width: 100%; min-height: 480px;
    border: 0; background: #ffffff;
}

/* ---- Provisioning overlay (lab.js makeOverlay) ---- */
.cac-lab-overlay {
    position: fixed;
    inset: 0;
    z-index: 9000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: rgba(15, 23, 42, 0.45);
    transition: opacity 350ms ease;
}
.cac-lab-overlay--hidden { opacity: 0; pointer-events: none; }
.cac-lab-overlay__card {
    background: rgba(255, 255, 255, 0.92);
    color: var(--cac-text, #0f172a);
    padding: 28px 36px;
    border-radius: 16px;
    box-shadow: 0 30px 60px -20px rgba(15, 23, 42, 0.4);
    text-align: center;
    max-width: 380px;
}
.cac-lab-overlay__spinner {
    width: 44px;
    height: 44px;
    margin: 0 auto 16px;
    border-radius: 50%;
    border: 3px solid rgba(96, 165, 250, 0.2);
    border-top-color: var(--cac-primary, #60a5fa);
    animation: cac-spin 0.9s linear infinite;
}
@keyframes cac-spin { to { transform: rotate(360deg); } }
.cac-lab-overlay__title {
    font-family: var(--cac-font-sans, system-ui), sans-serif;
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 6px;
}
.cac-lab-overlay__sub {
    font-family: var(--cac-font-sans, system-ui), sans-serif;
    font-size: 13px;
    color: #475569;
    margin: 0;
}

/* ---- Learning + career paths ---- */
.cac-progress {
    margin: 12px 0 4px;
    height: 6px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.08);
    overflow: hidden;
}
.cac-progress--large { height: 10px; }
.cac-progress span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--cac-primary, #60a5fa), #3b82f6);
    transition: width 350ms ease;
}
.cac-card--career { border-left: 4px solid var(--cac-primary, #60a5fa); }
.cac-tag {
    display: inline-block;
    padding: 1px 8px;
    border-radius: 999px;
    font-size: 11px;
    background: rgba(15, 23, 42, 0.06);
}
.cac-tag--paid { background: rgba(250, 204, 21, 0.18); color: #b45309; }

.cac-lesson-list {
    list-style: none;
    margin: 16px 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.cac-lesson-list__item { margin: 0; padding: 0; }
.cac-lesson-list__link {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    background: #fff;
    transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}
.cac-lesson-list__link:hover {
    border-color: var(--cac-primary, #60a5fa);
    transform: translateY(-1px);
    box-shadow: 0 6px 18px -10px rgba(15, 23, 42, 0.18);
}
.cac-lesson-list__num {
    font-family: var(--cac-font-mono, monospace);
    color: #94a3b8;
    font-size: 14px;
    min-width: 26px;
}
.cac-lesson-list__title { font-weight: 600; font-size: 15px; }
.cac-lesson-list__meta  { color: #64748b; font-size: 13px; }
.cac-lesson-list__status {
    font-size: 18px;
    color: #cbd5e1;
    min-width: 24px;
    text-align: center;
}
.cac-lesson-list__item[data-cac-completed="1"] .cac-lesson-list__status {
    color: #16a34a;
}

/* ---- Header account / login CTAs ---- */
.cac-site-header__inner {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}
.cac-nav {
    margin-left: auto;
}
.cac-nav__list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 20px;
}
.cac-nav__list li { margin: 0; padding: 0; }
.cac-nav__link {
    color: #475569;
    font-weight: 500;
    text-decoration: none;
    padding: 6px 0;
    transition: color var(--cac-dur-fast, 120ms);
}
.cac-nav__link:hover { color: var(--cac-primary, #2563eb); }

.cac-account {
    display: flex;
    align-items: center;
    gap: 10px;
}
.cac-account__name {
    color: #475569;
    font-size: 14px;
    font-weight: 500;
}
.cac-button--sm {
    padding: 8px 14px;
    font-size: 13px;
}

/* ---- Login card on /login/ ---- */
.cac-login-card {
    background: #fff;
    border-radius: 18px;
    padding: 40px 32px 32px;
    box-shadow: 0 24px 48px -24px rgba(15, 23, 42, 0.25);
    border: 1px solid rgba(15, 23, 42, 0.06);
    text-align: center;
}
.cac-login-card__title {
    font-family: var(--cac-font-sans, system-ui);
    font-size: 26px;
    font-weight: 700;
    margin: 0 0 8px;
    color: #0f172a;
}
.cac-login-card__sub {
    color: #64748b;
    font-size: 14px;
    margin: 0 0 24px;
}
.cac-login-card__buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.cac-login-card__divider {
    margin: 24px 0 16px;
    position: relative;
    color: #94a3b8;
    font-size: 13px;
}
.cac-login-card__divider::before,
.cac-login-card__divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: calc(50% - 24px);
    border-top: 1px solid rgba(15, 23, 42, 0.08);
}
.cac-login-card__divider::before { left: 0; }
.cac-login-card__divider::after  { right: 0; }
.cac-login-card__footer {
    color: #64748b;
    font-size: 14px;
    margin: 0;
}
.cac-login-card__footer a { color: var(--cac-primary, #2563eb); font-weight: 500; }

/* ---- Social login buttons (used on /login/ + login_form action) ---- */
.cac-button--social {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 18px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    border: 1px solid rgba(15, 23, 42, 0.1);
    transition: transform var(--cac-dur-fast, 120ms), box-shadow var(--cac-dur-fast, 120ms);
}
.cac-button--social:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px -8px rgba(15, 23, 42, 0.25);
}
.cac-button--google {
    background: #fff;
    color: #1f2937;
    border-color: #dadce0;
}
.cac-button--github {
    background: #24292e;
    color: #fff;
    border-color: #24292e;
}
.cac-button--github:hover { color: #fff; }

/* ---- Multi-modal lessons (video + lab + quiz) ----------------------- */

.cac-lab__video {
    margin: 0 0 1.25rem;
    padding: 0;
}
.cac-lab__video-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
}
.cac-lab__video-frame iframe,
.cac-lab__video-frame video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
.cac-lab__video-caption {
    padding: 0.65rem 0.1rem 0;
    font-size: 0.92rem;
    color: var(--cac-color-text-muted, #64748b);
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.cac-lab__video-caption strong {
    color: var(--cac-color-text, #0f172a);
    font-weight: 600;
}

/* In video-only and quiz-only modes the workspace pane is hidden and
   the left rail expands to use the whole viewport width. */
.cac-lab[data-cac-mode="video"] .cac-lab__workspace,
.cac-lab[data-cac-mode="quiz"]  .cac-lab__workspace {
    display: none;
}
.cac-lab[data-cac-mode="video"] .cac-lab__lesson,
.cac-lab[data-cac-mode="quiz"]  .cac-lab__lesson {
    max-width: 920px;
    margin: 0 auto;
}

/* Inline quiz block */
.cac-lab__quiz {
    margin-top: 1.5rem;
    padding: 1.25rem;
    border: 1px solid var(--cac-color-border, #e2e8f0);
    border-radius: 12px;
    background: #fafafa;
}
.cac-lab__quiz-header h2 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 1.25rem;
    margin: 0 0 0.25rem;
}
.cac-lab__quiz-questions {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
    counter-reset: q;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}
.cac-lab__quiz-question {
    counter-increment: q;
}
.cac-lab__quiz-prompt::before {
    content: "Q" counter(q) ". ";
    color: var(--cac-color-accent, #0056d2);
    font-weight: 600;
}
.cac-lab__quiz-prompt {
    margin: 0 0 0.45rem;
    font-weight: 500;
}
.cac-lab__quiz-options {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}
.cac-lab__quiz-options label {
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
    padding: 0.45rem 0.6rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.12s ease;
}
.cac-lab__quiz-options label:hover {
    background: rgba(0, 86, 210, 0.06);
}
.cac-lab__quiz-options input[type="radio"] {
    margin-top: 0.18rem;
}
.cac-lab__quiz-footer {
    margin-top: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

/* ---- Paywall page (/pay/<slug>/) ---------------------------------- */

.cac-pay {
    max-width: 560px;
    margin: 3rem auto;
    padding: 0 1.25rem;
}
.cac-pay__card {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 14px;
    padding: 2rem 2.25rem;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
}
.cac-pay__breadcrumb {
    margin: 0;
    color: #64748b;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.cac-pay__title {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 1.75rem;
    margin: 0.5rem 0 1.25rem;
}
.cac-pay__price {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    margin: 1.1rem 0;
}
.cac-pay__amount {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: #0056d2;
}
.cac-pay__list {
    margin: 1rem 0 1.4rem;
    padding-left: 1.2rem;
    color: #334155;
    font-size: 0.95rem;
    line-height: 1.65;
}
.cac-pay__btn {
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: 1rem;
}
.cac-pay__test-note {
    margin-top: 0.85rem;
    font-size: 0.8rem;
}
.cac-pay__test-note code {
    background: #f1f5f9;
    padding: 0.08rem 0.35rem;
    border-radius: 4px;
    font-size: 0.78rem;
}
.cac-pay__status {
    display: block;
    margin-top: 0.85rem;
    font-size: 0.9rem;
    min-height: 1.2em;
}
.cac-pay__free {
    color: #16a34a;
    font-weight: 500;
    margin: 1rem 0;
}

/* ---- /subscribe/ page ------------------------------------------- */

.cac-sub {
    max-width: 960px;
    margin: 3rem auto;
    padding: 0 1.25rem;
}
.cac-sub__header { text-align: center; margin-bottom: 2rem; }
.cac-sub__breadcrumb {
    color: #64748b;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0;
}
.cac-sub__title {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 2.25rem;
    margin: 0.5rem 0 0.4rem;
}
.cac-sub__lede { color: #475569; max-width: 540px; margin: 0 auto; }

.cac-sub__login {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: 10px;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.cac-sub__active {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.cac-sub__cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.75rem;
}
@media (max-width: 720px) { .cac-sub__cards { grid-template-columns: 1fr; } }

.cac-sub__card {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 14px;
    padding: 1.5rem 1.5rem 1.75rem;
    position: relative;
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.02);
}
.cac-sub__card h2 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 1.4rem;
    margin: 0 0 0.6rem;
}
.cac-sub__card--best { border-color: #0056d2; box-shadow: 0 0 0 1px #0056d2; }
.cac-sub__badge {
    position: absolute;
    top: -0.7rem; right: 1rem;
    background: #0056d2;
    color: #fff;
    font-size: 0.78rem;
    padding: 0.18rem 0.6rem;
    border-radius: 999px;
    font-weight: 600;
}
.cac-sub__price { margin: 0.2rem 0 0.1rem; }
.cac-sub__amount {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: #0056d2;
}
.cac-sub__effective { font-size: 0.85rem; margin: 0 0 0.85rem; }
.cac-sub__features {
    list-style: none; padding: 0; margin: 0.85rem 0 1.25rem;
    display: flex; flex-direction: column; gap: 0.35rem;
    font-size: 0.94rem;
    color: #334155;
}
.cac-sub__features li::before {
    content: "✓ ";
    color: #16a34a;
    font-weight: 600;
    margin-right: 0.25rem;
}
.cac-sub__cta { width: 100%; padding: 0.7rem 1rem; }

.cac-sub__trial {
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
    padding: 1.2rem 1.4rem;
    margin-top: 1.5rem;
    text-align: center;
}
.cac-sub__trial h3 {
    margin: 0 0 0.35rem;
    font-family: 'Space Grotesk', system-ui, sans-serif;
}
.cac-sub__trial-active {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 10px;
    padding: 0.95rem 1.2rem;
    margin-top: 1.25rem;
    font-size: 0.95rem;
}
.cac-sub__trial-pill {
    background: #0056d2;
    color: #fff;
    padding: 0.1rem 0.55rem;
    border-radius: 999px;
    font-size: 0.78rem;
    margin-right: 0.45rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.cac-sub__pay-options { text-align: center; margin-top: 1.5rem; font-size: 0.88rem; }
.cac-sub__test-note   { text-align: center; font-size: 0.82rem; margin-top: 0.65rem; }
.cac-sub__test-note code {
    background: #f1f5f9; padding: 0.08rem 0.35rem; border-radius: 4px;
}
.cac-sub__status { display: block; text-align: center; margin-top: 0.8rem; min-height: 1.2em; font-size: 0.9rem; }

/* ---- Lesson access gate (locked banner on scenario.php) -------- */
.cac-lab__locked {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    padding: 1.4rem 1.6rem;
    margin: 1.25rem 0;
    text-align: center;
}
.cac-lab__locked h3 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    margin: 0 0 0.4rem;
}

/* ---- Lesson type tags + cards ----------------------------------- */

.cac-tag.cac-tag--type {
    display: inline-block;
    background: #f1f5f9;
    color: #334155;
    padding: 0.08rem 0.5rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 500;
    margin-right: 0.2rem;
}
.cac-card--type-lecture .cac-card__eyebrow,
.cac-lesson-list__item--type-lecture .cac-tag--type {
    background: #fee2e2;
    color: #991b1b;
}
.cac-card--type-quiz .cac-card__eyebrow,
.cac-lesson-list__item--type-quiz .cac-tag--type {
    background: #fef3c7;
    color: #854d0e;
}
.cac-card--type-lab .cac-lesson-list__item--type-lab .cac-tag--type {
    background: #dcfce7;
    color: #166534;
}

/* ---- /account/ page ---------------------------------------------- */
.cac-acct { max-width: 1100px; margin: 2.5rem auto 4rem; padding: 0 1.25rem; }
.cac-acct__header h1 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 1.85rem;
    margin: 0 0 0.4rem;
}
.cac-acct__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}
.cac-acct__card {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 1.25rem 1.4rem;
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.02);
}
.cac-acct__card--wide { grid-column: 1 / -1; }
.cac-acct__card h2 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 1.1rem;
    margin: 0 0 0.65rem;
}
.cac-acct__pill {
    display: inline-block;
    padding: 0.18rem 0.7rem;
    border-radius: 999px;
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.65rem;
}
.cac-acct__pill--good   { background: #dcfce7; color: #166534; }
.cac-acct__pill--trial  { background: #dbeafe; color: #1e40af; }
.cac-acct__notice {
    background: #fef3c7;
    color: #92400e;
    padding: 0.55rem 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin: 0.7rem 0;
}
.cac-acct__activity {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    text-align: center;
}
@media (max-width: 560px) {
    .cac-acct__activity { grid-template-columns: 1fr; }
}
.cac-acct__big-number {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 2.4rem;
    font-weight: 700;
    color: #0056d2;
    margin: 0 0 0.1rem;
    line-height: 1;
}
.cac-acct__path { margin-bottom: 0.85rem; }
.cac-acct__path-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.25rem;
    font-size: 0.92rem;
}
.cac-acct__path-head a { color: #0056d2; text-decoration: none; }
.cac-acct__path-head a:hover { text-decoration: underline; }