/* ============================================
   Responsive — Mobile-First Breakpoints
   ============================================ */

/* ---- Mobile (base, no query needed) ---- */

/* Stack grids on mobile */
.grid--2,
.grid--3,
.grid--4 {
    grid-template-columns: 1fr;
}

/* Footer stacks on mobile */
.footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

/* Lesson nav stacks on mobile */
.lesson-nav {
    flex-direction: column;
}

.lesson-nav__next {
    text-align: left;
}

/* Smaller hero text on mobile */
.hero h1 {
    font-size: var(--fs-2xl);
}

.hero p {
    font-size: var(--fs-md);
}

/* Course hero meta wraps */
.course-hero__meta {
    flex-wrap: wrap;
    gap: var(--space-md);
}

/* ---- Tablet (768px+) ---- */
@media (min-width: 768px) {
    /* Mobile nav hidden, desktop nav shown */
    .nav__toggle {
        display: none !important;
    }

    .nav__menu {
        display: flex !important;
    }

    /* 2-column grids */
    .grid--2,
    .grid--3 {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Footer: 2 columns */
    .footer__grid {
        grid-template-columns: 2fr 1fr;
    }

    /* Hero sizing */
    .hero h1 {
        font-size: var(--fs-3xl);
    }

    .hero p {
        font-size: var(--fs-lg);
    }

    /* Lesson nav back to row */
    .lesson-nav {
        flex-direction: row;
    }

    .lesson-nav__next {
        text-align: right;
    }
}

/* ---- Desktop (1024px+) ---- */
@media (min-width: 1024px) {
    /* Full grid columns */
    .grid--3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .grid--4 {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Footer: 3 columns */
    .footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
    }

    /* Full hero sizing */
    .hero h1 {
        font-size: var(--fs-4xl);
    }

    .hero p {
        font-size: var(--fs-xl);
    }

    /* Larger section padding */
    .section {
        padding: var(--space-4xl) 0;
    }
}

/* ---- Mobile nav toggle (below 768px) ---- */
@media (max-width: 767px) {
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-dark);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-top: 1px solid var(--color-dark-mid);
    }

    .nav__menu.is-open {
        display: flex;
    }

    .nav__link {
        padding: var(--space-sm) 0;
        font-size: var(--fs-lg);
    }
}