:root {
    --bg: #0f172a; /* slate-900 */
    --card: #0b1226; /* deep card */
    --muted: #94a3b8; /* slate-400 */
    --text: #e2e8f0; /* slate-200 */
    --brand: #8b5cf6; /* violet-500 */
    --brand-2: #22d3ee; /* cyan-400 */
    --accent: #10b981; /* emerald-500 */
}

* {
    box-sizing: border-box
}

html, body {
 /*   margin: 0;*/
    height: 100%;
    background: radial-gradient(1200px 800px at 10% -10%, rgba(34,211,238,.25), transparent 55%), radial-gradient(900px 600px at 110% 30%, rgba(139,92,246,.20), transparent 60%), var(--bg);
    color: var(--text);
    font-family: system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif
}

a {
    text-decoration: none;
    color: inherit
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto
}

/* Navbar */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700
}

    .brand .dot {
        width: 10px;
        height: 10px;
        border-radius: 50%;
        background: linear-gradient(45deg,var(--brand),var(--brand-2))
    }

.nav .cta {
    background: linear-gradient(135deg,var(--brand),var(--brand-2));
    padding: 10px 16px;
    border-radius: 14px;
    font-weight: 600
}

/* Hero */
.hero {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 30px;
    align-items: center;
    padding: 40px 0 20px
}

@media (max-width:900px) {
    .hero {
        grid-template-columns: 1fr;
    }
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid rgba(255,255,255,.1);
    border-radius: 999px;
    padding: 6px 12px;
    color: var(--muted);
    backdrop-filter: blur(6px)
}

.title {
    font-size: clamp(28px,5vw,46px);
    line-height: 1.1;
    margin: 14px 0 12px
}

.sub {
    color: var(--muted);
    font-size: clamp(14px,2vw,18px)
}

.hero-card {
    background: rgba(255,255,255,.04);
    border: 1px solid rgba(255,255,255,.08);
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,.35)
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 14px;
    margin: 24px 0
}

@media (max-width:800px) {
    .stats {
        grid-template-columns: repeat(2,1fr)
    }
}

.stat {
    background: linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
    border: 1px solid rgba(255,255,255,.08);
    padding: 16px;
    border-radius: 16px;
    text-align: center
}

    .stat .v {
        font-size: 28px;
        font-weight: 800
    }

    .stat .k {
        color: var(--muted);
        font-size: 13px
    }

/* Sections */
.section {
    padding: 34px 0
}

.cards {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 16px
}

@media (max-width:900px) {
    .cards {
        grid-template-columns: 1fr;
    }
}

.card {
    background: rgba(11,18,38,.65);
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 18px;
    padding: 20px
}

    .card h3 {
        margin: 0 0 10px;
        font-size: 20px
    }

.list {
    margin: 0;
    padding-left: 18px;
    color: var(--text)
}

    .list li {
        margin: 8px 0;
        color: var(--muted)
    }

/* Instructor */
.instructor {
    display: flex;
    gap: 14px;
    align-items: center
}

.avatar {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    background: linear-gradient(135deg,var(--brand),var(--brand-2));
    display: grid;
    place-items: center;
    font-weight: 800
}

.rating {
    font-size: 14px;
    color: #ffd479
}

/* Pay Box */
.paybox {
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: linear-gradient(180deg,rgba(34,211,238,.12),rgba(139,92,246,.10));
    border: 1px solid rgba(255,255,255,.15);
    padding: 18px;
    border-radius: 18px
}

.price {
    font-size: 34px;
    font-weight: 900
}

.paybtn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg,var(--accent),#34d399);
    border: none;
    color: #06281d;
    padding: 14px 18px;
    border-radius: 14px;
    font-weight: 800;
    cursor: pointer
}

.paymeta {
    font-size: 12px;
    color: var(--muted)
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,.6);
    padding: 20px;
    z-index: 50
}

    .modal.active {
        display: flex
    }

.modal-card {
    width: min(520px,95vw);
    background: #0b1226;
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 18px;
    padding: 18px
}

.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px
}

.close {
    background: transparent;
    border: 1px solid rgba(255,255,255,.18);
    color: var(--text);
    padding: 6px 10px;
    border-radius: 10px;
    cursor: pointer
}

.qr {
    display: grid;
    place-items: center;
    padding: 12px;
    border-radius: 14px;
    background: rgba(255,255,255,.04);
    border: 1px solid rgba(255,255,255,.08)
}

.copy {
    margin-top: 10px;
    display: inline-flex;
    gap: 8px;
    align-items: center;
    border: 1px solid rgba(255,255,255,.18);
    padding: 8px 12px;
    border-radius: 12px;
    cursor: pointer;
    background: transparent;
    color: var(--text)
}

.hint {
    color: var(--muted);
    font-size: 12px;
    margin-top: 8px
}