:root {
    --bg: #07120e;
    --panel: #102018;
    --panel-2: #163028;
    --text: #e7f0ea;
    --muted: #93ad9e;
    --primary: #52b788;
    --primary-dark: #2d6a4f;
    --border: #264033;
    --radius: 16px;
    --font: Inter, system-ui, sans-serif;
    --display: Outfit, system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font);
    background: radial-gradient(1200px 600px at 10% -10%, #143528 0%, var(--bg) 55%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.55;
}
a { color: var(--primary); text-decoration: none; }
.container { width: min(1100px, calc(100% - 32px)); margin: 0 auto; }

.top {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(10px);
    background: rgba(7, 18, 14, 0.85);
    border-bottom: 1px solid var(--border);
}
.top-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    flex-wrap: wrap;
}
.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text);
}
.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--primary-dark);
    color: var(--primary);
    display: grid;
    place-items: center;
    font-family: var(--display);
    font-weight: 700;
    font-size: 1.2rem;
}
.brand strong { display: block; font-family: var(--display); }
.brand small { color: var(--muted); font-size: 0.78rem; }
nav { display: flex; gap: 14px; flex-wrap: wrap; }
nav a {
    color: var(--muted);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 10px;
    border-radius: 999px;
}
nav a.active, nav a:hover {
    color: var(--text);
    background: var(--panel);
}
nav a.nav-cta {
    background: var(--primary);
    color: #042016;
    font-weight: 600;
}
nav a.nav-cta:hover { filter: brightness(1.05); color: #042016; }
.hero-meta {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 1.1rem;
    margin-top: 1.15rem;
    color: var(--muted);
    font-size: 0.9rem;
}
.hero-meta li::before {
    content: "· ";
    color: var(--primary);
    font-weight: 700;
}
.foot-inner {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}
.back-row { margin-top: 1.5rem; }

.hero-panel {
    margin: 28px 0 12px;
    padding: 28px;
    border-radius: 22px;
    background: linear-gradient(145deg, var(--panel) 0%, #0c1c15 100%);
    border: 1px solid var(--border);
}
.eyebrow {
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
h1, h2, h3 { font-family: var(--display); line-height: 1.2; }
h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 10px; }
.lead { color: var(--muted); max-width: 60ch; margin-bottom: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    padding: 11px 16px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    font: inherit;
}
.btn.primary { background: var(--primary); color: #042016; }
.btn.ghost, .btn.small.ghost {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
}
.btn.small { padding: 8px 12px; font-size: 0.9rem; background: var(--primary); color: #042016; }

.section { margin: 36px 0; }
.section-head { margin-bottom: 16px; }
.section-head p { color: var(--muted); }

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}
.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.tag {
    display: inline-block;
    width: fit-content;
    font-size: 0.78rem;
    color: var(--primary);
    background: rgba(82, 183, 136, 0.12);
    padding: 4px 8px;
    border-radius: 999px;
}
.card p, .card li { color: var(--muted); font-size: 0.95rem; }
.card ul { padding-left: 1.1rem; display: grid; gap: 4px; }
.card-foot {
    margin-top: auto;
    padding-top: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}
.price { font-weight: 600; color: var(--text); }

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 22px;
}
.form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}
.form label {
    display: grid;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--muted);
}
.form label:nth-child(n+5),
.form button { grid-column: 1 / -1; }
.form input, .form select, .form textarea {
    width: 100%;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #0b1712;
    color: var(--text);
    padding: 10px 12px;
    font: inherit;
}
.checklist { padding-left: 1.2rem; color: var(--muted); display: grid; gap: 6px; margin: 8px 0 16px; }
.checklist.muted { opacity: 0.85; }
.price-note {
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--panel-2);
    border: 1px solid var(--border);
}

.course-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 20px;
    margin: 24px auto 48px;
    align-items: start;
}
.toc {
    position: sticky;
    top: 84px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
}
.toc h2 { font-size: 0.95rem; margin-bottom: 10px; color: var(--muted); font-weight: 600; }
.toc ol { list-style: none; display: grid; gap: 6px; }
.toc a {
    display: block;
    color: var(--muted);
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 0.92rem;
}
.toc a.active, .toc a:hover { background: var(--panel-2); color: var(--text); }
.course-body {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 24px;
}
.lesson { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--border); }
.lesson h2 { margin-bottom: 8px; font-size: 1.2rem; }
.callout {
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(82, 183, 136, 0.08);
    border: 1px solid var(--border);
}
.callout ul { margin-top: 6px; padding-left: 1.1rem; color: var(--muted); }
.files { display: grid; gap: 8px; margin: 12px 0; }
.file {
    display: block;
    padding: 12px 14px;
    border-radius: 12px;
    background: #0b1712;
    border: 1px solid var(--border);
    color: var(--text);
}
.file:hover { border-color: var(--primary); }
.muted { color: var(--muted); font-size: 0.9rem; }

.foot {
    border-top: 1px solid var(--border);
    padding: 18px 0 28px;
    color: var(--muted);
    font-size: 0.88rem;
}

@media (max-width: 800px) {
    .form { grid-template-columns: 1fr; }
    .form label:nth-child(n+5), .form button { grid-column: auto; }
    .course-layout { grid-template-columns: 1fr; }
    .toc { position: static; }
    .hero-panel { padding: 20px 16px; }
    h1 { font-size: 1.45rem; }
    .top-inner { padding: 12px 0; }
    nav { width: 100%; }
    nav a { font-size: 0.88rem; padding: 6px 8px; }
    .cards { grid-template-columns: 1fr; }
    .form input, .form select, .form textarea { font-size: 16px; }
}

@media (max-width: 400px) {
    .container { width: calc(100% - 20px); }
    .brand small { display: none; }
}