/* ============================================================
   Components · DARK-FIRST · buttons, cards, chips, modules, faq
   ============================================================ */

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(14, 14, 12, 0.85);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
    border-bottom: 1px solid var(--line);
}
.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: 2rem;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
    color: var(--ink);
    font-weight: 500;
    letter-spacing: var(--tracking-snug);
}
.brand img { width: 22px; height: 22px; filter: brightness(0) invert(1); }
.nav { display: flex; gap: 1.75rem; align-items: center; }
.nav a {
    text-decoration: none;
    color: var(--ink-muted);
    font-size: var(--t-small);
    transition: color var(--t-fast) var(--ease-out);
}
.nav a:hover { color: var(--ink); }
.nav .nav-cta {
    color: var(--on-volt);
    background: var(--volt);
    padding: 0.45rem 0.9rem;
    border-radius: var(--radius-pill);
    font-weight: 500;
    transition: transform var(--t-fast), background var(--t-fast);
}
.nav .nav-cta:hover { background: var(--volt-deep); transform: translateY(-1px); color: var(--on-volt); }

@media (max-width: 720px) {
    .nav { gap: 1rem; }
    .nav a:not(.nav-cta) { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.85rem 1.4rem;
    border-radius: var(--radius-pill);
    font-weight: 500;
    font-size: var(--t-body);
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform var(--t-fast) var(--ease-out),
                background var(--t-fast),
                border-color var(--t-fast),
                color var(--t-fast);
    line-height: 1;
    white-space: nowrap;
}
.btn--primary {
    background: var(--ink);
    color: var(--paper);
}
.btn--primary:hover { background: var(--volt); color: var(--on-volt); transform: translateY(-1px); }

.btn--volt {
    background: var(--volt);
    color: var(--on-volt);
}
.btn--volt:hover { background: var(--volt-deep); transform: translateY(-1px); color: var(--on-volt); }

.btn--ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--volt); color: var(--volt); }

.btn--lg { padding: 1.05rem 1.8rem; font-size: var(--t-body-l); }

/* ---------- Chips (skill tags) ---------- */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.7rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: var(--tracking-mono);
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-pill);
    transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.chip:hover {
    background: var(--volt);
    color: var(--on-volt);
    border-color: var(--volt);
}
.chip--volt {
    background: var(--volt);
    border-color: var(--volt);
    color: var(--on-volt);
}
.chip--volt:hover { background: var(--volt-deep); border-color: var(--volt-deep); color: var(--on-volt); }

.chip-row { display: flex; flex-wrap: wrap; gap: 0.45rem; }

/* ---------- Cards ---------- */
.card {
    background: var(--paper-card);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: border-color var(--t-base) var(--ease-out);
}
.card:hover { border-color: var(--line-bold); }

/* ---------- Stat number ---------- */
.stat {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1.25rem 0;
}
.stat__num {
    font-family: var(--font-mono);
    font-size: clamp(2.25rem, 4vw, 3.25rem);
    font-weight: 400;
    letter-spacing: var(--tracking-tight);
    line-height: 1;
    color: var(--ink);
}
.stat__num small {
    font-size: 0.5em;
    font-weight: 400;
    color: var(--ink-muted);
    margin-left: 0.05em;
}
.stat__label {
    font-size: var(--t-small);
    color: var(--ink-muted);
    line-height: 1.4;
}

/* ---------- Course meta strip ---------- */
.meta-strip {
    border-top: 1px solid var(--line-bold);
    border-bottom: 1px solid var(--line-bold);
    background: var(--paper);
}
.meta-strip__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.meta-strip__item {
    padding: 1.25rem 1.5rem;
    border-right: 1px solid var(--line);
}
.meta-strip__item:last-child { border-right: 0; }
.meta-strip__label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    color: var(--ink-muted);
    margin-bottom: 0.4rem;
}
.meta-strip__value {
    font-size: 0.98rem;
    font-weight: 500;
    color: var(--ink);
    line-height: 1.35;
}
@media (max-width: 720px) {
    .meta-strip__item { border-right: 0; border-bottom: 1px solid var(--line); }
    .meta-strip__item:last-child { border-bottom: 0; }
}

/* ---------- Outcomes list ---------- */
.outcomes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0 2.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}
.outcomes li {
    position: relative;
    padding-left: 1.75rem;
    line-height: 1.55;
    color: var(--ink-soft);
    border-top: 1px solid var(--line);
    padding-top: 1rem;
    padding-bottom: 1rem;
}
.outcomes li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 1.45rem;
    width: 0.7rem;
    height: 0.7rem;
    background: var(--volt);
    transform: rotate(45deg);
}

/* ---------- Module / syllabus ---------- */
.modules { display: flex; flex-direction: column; }
.module {
    display: grid;
    grid-template-columns: 80px 1fr auto;
    gap: 2rem;
    align-items: start;
    padding: 2.25rem 0;
    border-top: 1px solid var(--line);
}
.module:last-child { border-bottom: 1px solid var(--line); }
.module__num {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--ink-muted);
    letter-spacing: var(--tracking-mono);
    padding-top: 0.4rem;
}
.module__title { margin: 0 0 0.8rem; color: var(--ink); }
.module__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1.4rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--ink-muted);
    margin-bottom: 1rem;
}
.module__meta span { display: inline-flex; align-items: center; gap: 0.45rem; }
.module__body p { color: var(--ink-soft); margin-bottom: 1rem; }
.module__body ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.4rem 2rem;
}
.module__body ul li {
    color: var(--ink-soft);
    font-size: 0.95rem;
    padding-left: 1.1rem;
    position: relative;
    line-height: 1.55;
}
.module__body ul li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--ink-muted);
}
.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.65rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    border-radius: var(--radius-sm);
    border: 1px solid var(--line-strong);
    color: var(--ink);
    background: transparent;
    align-self: start;
    margin-top: 0.4rem;
}
.tag--volt { background: var(--volt); border-color: var(--volt); color: var(--on-volt); }

@media (max-width: 720px) {
    .module {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    .module__num { padding-top: 0; font-size: 0.85rem; }
    .tag { justify-self: start; margin-top: 0.5rem; }
}

/* ---------- Spec table ---------- */
.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}
.spec-table tr { border-bottom: 1px solid var(--line); }
.spec-table tr:last-child { border-bottom: 0; }
.spec-table td { padding: 0.85rem 0; vertical-align: top; }
.spec-table td:first-child {
    color: var(--ink-muted);
    width: 50%;
    padding-right: 1rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}
.spec-table td:last-child { color: var(--ink); }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq-item {
    border-bottom: 1px solid var(--line);
    padding: 1.5rem 0;
}
.faq-item summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
    font-size: var(--t-body-l);
    color: var(--ink);
    padding-right: 0.5rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: "+";
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--ink);
    transition: transform var(--t-base) var(--ease-out);
    flex-shrink: 0;
}
.faq-item[open] summary::after { content: "−"; color: var(--volt); }
.faq-item p {
    margin-top: 1rem;
    color: var(--ink-soft);
    max-width: var(--prose-max);
}

/* ---------- Pricing card ---------- */
.price-card {
    border: 1px solid var(--line-bold);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    background: var(--paper-card);
    display: grid;
    gap: 1.5rem;
}
.price-card__head { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 1rem; }
.price-card__price {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    letter-spacing: var(--tracking-tight);
    line-height: 1;
    color: var(--ink);
    margin: 0;
}
.price-card__price small { font-size: 0.4em; color: var(--ink-muted); margin-left: 0.5em; }

.urgency-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    background: var(--volt);
    color: var(--on-volt);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    border-radius: var(--radius-pill);
    letter-spacing: var(--tracking-mono);
}
.urgency-pill::before {
    content: "";
    width: 6px; height: 6px;
    background: var(--on-volt);
    border-radius: 50%;
    animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1 } 50% { opacity: 0.3 } }

.includes { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5rem; }
.includes li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--ink-soft);
    font-size: 0.95rem;
    line-height: 1.6;
}
.includes li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0.05rem;
    color: var(--volt);
    font-weight: 500;
}

/* ---------- Sticky CTA mobile ---------- */
.sticky-cta {
    display: none;
    position: sticky;
    bottom: 0;
    background: var(--paper-deep);
    color: var(--ink);
    border-top: 1px solid var(--line);
    padding: 0.85rem 1rem;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    z-index: 40;
}
.sticky-cta__price { font-family: var(--font-mono); font-weight: 500; color: var(--ink); }
.sticky-cta__price small { display: block; font-size: 0.7rem; color: var(--ink-muted); font-weight: 400; }
@media (max-width: 720px) { .sticky-cta { display: flex; } }

/* ---------- Footer ---------- */
.site-footer {
    padding: var(--section-py-tight) 0 2rem;
    border-top: 1px solid var(--line);
    color: var(--ink-muted);
    font-size: var(--t-small);
}
.site-footer__top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}
.site-footer__top h4 {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--ink);
    margin: 0 0 0.8rem;
}
.site-footer__top a { display: block; color: var(--ink-muted); text-decoration: none; padding: 0.2rem 0; }
.site-footer__top a:hover { color: var(--volt); }
.site-footer__bottom {
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid var(--line);
}
@media (max-width: 720px) { .site-footer__top { grid-template-columns: 1fr; gap: 2rem; } }