/* ============================================================
   MyCDLPractice - main.css
   Design system: clean modern SaaS aesthetic
   Mobile-first, deep blue accent (#0F4C81), Inter typography
   ============================================================ */

/* --- Design tokens --- */
:root {
    --color-primary: #0F4C81;
    --color-primary-hover: #0A3A66;
    --color-primary-soft: #E8F0F9;
    --color-accent: #F59E0B;

    --color-text: #0F1B2D;
    --color-text-muted: #5A6B83;
    --color-text-soft: #8A98AE;

    --color-bg: #FFFFFF;
    --color-bg-soft: #F7F9FC;
    --color-bg-alt: #F0F4FA;

    --color-border: #E2E8F0;
    --color-border-strong: #CBD5E1;

    --color-success: #10B981;
    --color-error: #EF4444;

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 2px rgba(15, 27, 45, 0.04);
    --shadow: 0 2px 8px rgba(15, 27, 45, 0.06), 0 1px 2px rgba(15, 27, 45, 0.04);
    --shadow-lg: 0 12px 24px rgba(15, 27, 45, 0.08), 0 2px 6px rgba(15, 27, 45, 0.04);
    --shadow-hover: 0 16px 32px rgba(15, 76, 129, 0.12), 0 4px 8px rgba(15, 27, 45, 0.06);

    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;

    --container: 1180px;
    --header-h: 72px;

    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--color-primary-hover); }
button { font-family: inherit; cursor: pointer; }
ul, ol { padding-left: 1.25rem; }

h1, h2, h3, h4 {
    margin: 0 0 0.5em;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text);
    font-weight: 700;
}
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }
p { margin: 0 0 1em; }

/* --- Skip link (accessibility) --- */
.skip-link {
    position: absolute; top: -40px; left: 0;
    background: var(--color-primary); color: white;
    padding: 0.5rem 1rem; z-index: 9999;
    transition: top 0.2s;
}
.skip-link:focus { top: 0; color: white; }

/* --- Container --- */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 1.25rem;
}
@media (min-width: 768px) { .container { padding: 0 2rem; } }

/* --- Header --- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--color-border);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: var(--header-h);
}
.brand {
    display: inline-flex; align-items: center; gap: 0.6rem;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
}
.brand:hover { color: var(--color-primary); }
.brand-mark {
    display: inline-flex; align-items: center; justify-content: center;
    width: 36px; height: 36px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
}
.brand-text strong { color: var(--color-primary); font-weight: 700; }

.primary-nav { display: flex; align-items: center; }
.nav-menu {
    display: none;
    list-style: none; margin: 0; padding: 0;
    gap: 2rem;
}
.nav-menu li a {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.15s;
}
.nav-menu li a:hover { color: var(--color-primary); }
@media (min-width: 768px) {
    .nav-menu { display: flex; }
    .nav-toggle { display: none; }
}

.nav-toggle {
    display: flex; flex-direction: column; gap: 4px;
    background: none; border: none;
    width: 40px; height: 40px;
    align-items: center; justify-content: center;
}
.nav-toggle span {
    display: block; width: 22px; height: 2px;
    background: var(--color-text); border-radius: 2px;
    transition: transform 0.2s;
}
.nav-toggle[aria-expanded="true"] + .nav-menu { display: flex; }
.nav-menu.open { display: flex; }

@media (max-width: 767px) {
    .nav-menu.open {
        position: absolute; top: var(--header-h); left: 0; right: 0;
        background: white; flex-direction: column; gap: 0;
        padding: 1rem 1.25rem; border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow);
    }
    .nav-menu.open li { padding: 0.6rem 0; border-bottom: 1px solid var(--color-border); }
    .nav-menu.open li:last-child { border-bottom: none; }
}

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600; font-size: 1rem;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    line-height: 1;
    white-space: nowrap;
}
.btn-primary {
    background: var(--color-primary); color: white;
    box-shadow: var(--shadow);
}
.btn-primary:hover {
    background: var(--color-primary-hover); color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}
.btn-ghost {
    background: white; color: var(--color-text);
    border-color: var(--color-border-strong);
}
.btn-ghost:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.btn-lg { padding: 1rem 1.75rem; font-size: 1.0625rem; }

/* --- Hero --- */
.hero {
    padding: 4rem 0 3rem;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(15, 76, 129, 0.06) 0%, transparent 60%),
        linear-gradient(180deg, white 0%, var(--color-bg-soft) 100%);
}
@media (min-width: 768px) {
    .hero { padding: 6rem 0 5rem; }
}
.hero-inner { text-align: center; max-width: 820px; margin: 0 auto; }
.hero-eyebrow {
    display: inline-block;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}
.hero-title { margin-bottom: 1rem; }
.hero-title .accent { color: var(--color-primary); }
.hero-sub {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto 2rem;
}
.hero-cta {
    display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center;
    margin-bottom: 3rem;
}
.hero-stats {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}
.stat { text-align: center; }
.stat strong {
    display: block;
    font-size: 1.75rem;
    color: var(--color-primary);
    font-weight: 800;
}
.stat span {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* --- Sections --- */
.section { padding: 4rem 0; }
@media (min-width: 768px) { .section { padding: 5.5rem 0; } }
.section--alt { background: var(--color-bg-soft); }

.section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 3rem;
}
.section-head h2 { margin-bottom: 0.75rem; }
.section-head p {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    margin: 0;
}
.section-cta { text-align: center; margin-top: 2.5rem; }

/* --- Endorsement grid --- */
.endorsement-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 600px) { .endorsement-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .endorsement-grid { grid-template-columns: 1fr 1fr 1fr; } }

.endorsement-card {
    display: flex; flex-direction: column;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    color: var(--color-text);
    transition: all 0.2s ease;
}
.endorsement-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    color: var(--color-text);
}
.endorsement-icon {
    width: 44px; height: 44px;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1rem;
}
.endorsement-card h3 { font-size: 1.125rem; margin-bottom: 0.5rem; }
.endorsement-card p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    flex-grow: 1;
    margin-bottom: 1rem;
}
.endorsement-meta {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}
.endorsement-meta .arrow {
    color: var(--color-primary);
    font-weight: 700;
    transition: transform 0.2s;
}
.endorsement-card:hover .arrow { transform: translateX(4px); }

/* --- Value cards --- */
.value-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}
@media (min-width: 700px) { .value-grid { grid-template-columns: 1fr 1fr; } }

.value-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
}
.value-number {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
}
.value-card h3 { margin-bottom: 0.5rem; font-size: 1.1875rem; }
.value-card p {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 0.9375rem;
}

/* --- How-to list --- */
.howto-list {
    list-style: none; padding: 0; margin: 0;
    max-width: 720px; margin: 0 auto;
    display: flex; flex-direction: column; gap: 1.5rem;
}
.howto-list li {
    display: flex; gap: 1.25rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}
.howto-step {
    flex-shrink: 0;
    width: 40px; height: 40px;
    background: var(--color-primary);
    color: white;
    border-radius: 999px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
}
.howto-list h3 { margin-bottom: 0.25rem; font-size: 1.0625rem; }
.howto-list p { color: var(--color-text-muted); margin: 0; font-size: 0.9375rem; }

/* --- FAQ list --- */
.faq-list {
    max-width: 720px;
    margin: 0 auto;
}
.faq-list details {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 0.75rem;
    transition: border-color 0.15s;
}
.faq-list details[open] { border-color: var(--color-primary); }
.faq-list summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text);
    list-style: none;
    display: flex; justify-content: space-between; align-items: center;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
    content: "+";
    color: var(--color-primary);
    font-size: 1.5rem;
    line-height: 1;
    transition: transform 0.2s;
}
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list p {
    margin: 1rem 0 0;
    color: var(--color-text-muted);
}

/* --- Cross-promo --- */
.cross-promo {
    padding: 4rem 0;
    background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg-soft) 100%);
}
.cross-promo-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 700px) { .cross-promo-grid { grid-template-columns: 1fr 1fr; } }
.promo-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    color: var(--color-text);
    transition: all 0.2s;
    display: block;
}
.promo-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-hover);
    color: var(--color-text);
    transform: translateY(-2px);
}
.promo-tag {
    display: inline-block;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}
.promo-card--alt .promo-tag {
    background: #FEF3C7;
    color: #92400E;
}
.promo-card h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.promo-card p {
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
    font-size: 0.9375rem;
}
.promo-cta {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9375rem;
}

/* --- Footer --- */
.site-footer {
    background: #0A1A2E;
    color: #C7D1E0;
}
.site-footer .brand { color: white; }
.site-footer .brand-text strong { color: #6FA8DC; }
.site-footer .brand-mark {
    background: rgba(255,255,255,0.1);
    color: white;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 4rem 1.25rem 2.5rem;
}
@media (min-width: 700px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; padding: 4rem 2rem 2.5rem; }
}
.footer-tagline {
    color: #8A98AE;
    font-size: 0.9375rem;
    margin-top: 0.75rem;
    max-width: 320px;
}
.footer-col h4 {
    color: white;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}
.footer-col ul {
    list-style: none; padding: 0; margin: 0;
}
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a {
    color: #C7D1E0;
    font-size: 0.9375rem;
}
.footer-col a:hover { color: white; }
.footer-legal {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 1.5rem 0;
    font-size: 0.8125rem;
    color: #6B7A91;
}
.footer-legal p { margin: 0 0 0.5rem; }
.footer-disclaimer { max-width: 800px; }

/* --- Article / long-form (privacy, terms, study guides) --- */
.article {
    max-width: 760px;
    margin: 0 auto;
    padding: 3rem 0 4rem;
}
.article h1 { margin-bottom: 0.5rem; }
.article-meta {
    color: var(--color-text-soft);
    font-size: 0.9375rem;
    margin-bottom: 2rem;
}
.article h2 { margin-top: 2.5rem; font-size: 1.5rem; }
.article h3 { margin-top: 2rem; }
.article p, .article ul, .article ol { font-size: 1.0625rem; color: var(--color-text); }
.article ul li, .article ol li { margin-bottom: 0.5rem; }

/* --- Quiz engine --- */
.quiz-shell {
    max-width: 720px; margin: 0 auto; padding: 2rem 0 4rem;
}
.quiz-progress {
    height: 6px; background: var(--color-border);
    border-radius: 999px; overflow: hidden;
    margin-bottom: 1.5rem;
}
.quiz-progress-fill {
    height: 100%; background: var(--color-primary);
    transition: width 0.4s ease;
}
.quiz-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow);
}
.quiz-card--center { text-align: center; }
@media (min-width: 700px) { .quiz-card { padding: 2.25rem; } }

.quiz-meta {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 1rem;
}
.quiz-q-num {
    font-size: 0.875rem; color: var(--color-text-muted); font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.04em;
}
.quiz-score-tag {
    font-size: 0.875rem;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-weight: 600;
}
.quiz-q-text {
    font-size: 1.1875rem; font-weight: 600;
    margin: 0 0 1.5rem; line-height: 1.4;
    color: var(--color-text);
}
@media (min-width: 700px) { .quiz-q-text { font-size: 1.3125rem; } }
.quiz-intro {
    color: var(--color-text-muted); font-size: 0.9375rem;
    margin-bottom: 1.5rem;
}

.quiz-answers {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 0.625rem;
}
.quiz-answer {
    width: 100%;
    display: flex; align-items: flex-start; gap: 0.875rem;
    padding: 1rem 1.125rem;
    background: white;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit; font-size: 0.9375rem;
    text-align: left;
    color: var(--color-text);
    line-height: 1.5;
}
.quiz-answer:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
    transform: translateY(-1px);
}
.quiz-answer:disabled { cursor: default; }
.quiz-answer.is-correct {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.08);
}
.quiz-answer.is-wrong {
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.06);
}
.quiz-letter {
    flex-shrink: 0;
    width: 28px; height: 28px;
    border-radius: 999px;
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border-strong);
    display: inline-flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 0.0625rem;
}
.quiz-answer:hover:not(:disabled) .quiz-letter {
    background: var(--color-primary);
    color: white; border-color: var(--color-primary);
}
.quiz-answer.is-correct .quiz-letter {
    background: var(--color-success); color: white; border-color: var(--color-success);
}
.quiz-answer.is-wrong .quiz-letter {
    background: var(--color-error); color: white; border-color: var(--color-error);
}
.quiz-answer-text { flex: 1; }

.quiz-feedback {
    margin-top: 1.25rem;
    padding: 1.125rem 1.25rem;
    border-radius: var(--radius);
    border: 1px solid;
}
.quiz-feedback.is-right { background: rgba(16, 185, 129, 0.06); border-color: rgba(16, 185, 129, 0.3); }
.quiz-feedback.is-wrong { background: rgba(239, 68, 68, 0.04); border-color: rgba(239, 68, 68, 0.25); }
.quiz-feedback-head {
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.quiz-feedback.is-right .quiz-feedback-head { color: var(--color-success); }
.quiz-feedback.is-wrong .quiz-feedback-head { color: var(--color-error); }
.quiz-feedback-body {
    color: var(--color-text);
    font-size: 0.9375rem;
    line-height: 1.55;
    margin: 0 0 1rem;
}
.quiz-feedback .btn { margin-top: 0.25rem; }

.quiz-spinner {
    width: 36px; height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 999px;
    margin: 0.5rem auto 1rem;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Results screen --- */
.quiz-results { text-align: center; }
.quiz-result-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    margin-bottom: 0.75rem;
}
.quiz-result-tag.is-pass { background: rgba(16, 185, 129, 0.12); color: var(--color-success); }
.quiz-result-tag.is-fail { background: rgba(239, 68, 68, 0.1); color: var(--color-error); }
.quiz-score-block {
    margin: 1.5rem 0;
    padding: 1.5rem 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.quiz-score-num {
    font-size: 3rem; font-weight: 800; color: var(--color-primary);
    line-height: 1;
}
.quiz-score-pct {
    font-size: 0.9375rem; color: var(--color-text-muted);
    margin-top: 0.25rem;
}
.quiz-result-actions {
    display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center;
}

.quiz-review {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}
.quiz-review h3 {
    font-size: 1.0625rem;
    margin-bottom: 1rem;
}
.quiz-review-item {
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.125rem 1.25rem;
    margin-bottom: 0.75rem;
    text-align: left;
}
.quiz-review-q {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    line-height: 1.45;
}
.quiz-review-line {
    color: var(--color-text);
    font-size: 0.9375rem;
}
.quiz-review-exp {
    margin: 0.5rem 0 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

/* --- AdSense placement (only renders when enabled) --- */
.ad-slot {
    margin: 2.5rem auto;
    max-width: 728px;
    min-height: 90px;
    display: flex; align-items: center; justify-content: center;
    background: var(--color-bg-soft);
    border-radius: var(--radius);
    color: var(--color-text-soft);
    font-size: 0.8125rem;
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }