:root {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-hover: #263347;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-primary: #3b82f6;
    --color-primary-glow: rgba(59, 130, 246, 0.25);
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    --radius: 12px;
    --transition: 0.2s ease;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Top bar ── */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 48px;
    border-bottom: 1px solid var(--color-border);
}

.topbar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.topbar__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 10px var(--color-primary-glow);
}

.topbar__name {
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--color-text);
}

.topbar__meta {
    font-size: 0.78rem;
    color: var(--color-text-dim);
}

/* ── Hero ── */
.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px 48px;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border-radius: 20px;
    border: 1px solid rgba(59, 130, 246, 0.35);
    background: rgba(59, 130, 246, 0.08);
    color: #93c5fd;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 28px;
}

.hero__badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #3b82f6;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero__title-highlight {
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 480px;
    line-height: 1.65;
    margin-bottom: 48px;
}

/* ── Module grid ── */
.modules {
    width: 100%;
    max-width: 880px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    padding: 0 24px;
}

.module-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-glow), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition);
}

.module-card:hover {
    background: var(--color-surface-hover);
    border-color: rgba(59, 130, 246, 0.4);
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
    text-decoration: none;
}

.module-card:hover::before {
    opacity: 1;
}

.module-card__icon {
    font-size: 1.75rem;
    line-height: 1;
}

.module-card__label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.module-card__desc {
    font-size: 0.83rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    flex: 1;
}

.module-card__arrow {
    font-size: 0.8rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-top: 4px;
}

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--color-text-dim);
    font-size: 0.78rem;
    border-top: 1px solid var(--color-border);
    margin-top: 64px;
}