/* ============================================================
   Shining Smiles Periodontics — responsive overrides
   Mobile-first: assume small screen by default in style.css,
   then progressively enhance up. (Some shared base rules are
   in style.css; this file only contains breakpoint overrides.)
   ============================================================ */

/* ===== Large desktops (>= 1280px) — generous spacing ===== */
@media (min-width: 1280px) {
    :root {
        --section-y: 6rem;
    }
}

/* ===== Tablet landscape & small desktops (<= 1024px) ===== */
@media (max-width: 1024px) {
    :root {
        --fs-4xl: 3rem;
        --fs-3xl: 2.5rem;
        --fs-2xl: 2rem;
        --section-y: 4rem;
    }
    .hero-grid,
    .about-grid,
    .implants-grid,
    .doctor-grid,
    .contact-grid,
    .service-intro-grid,
    .service-closing-inner {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .hero-media { order: -1; }
    .hero-media,
    .about-media,
    .doctor-media,
    .implants-media,
    .service-intro-media,
    .service-split-media {
        max-width: 560px;
        margin-inline: auto;
    }
    .service-split-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .service-split-media { order: -1; }
    .service-split-content .service-detail-actions .btn { flex: 1 1 auto; }
    .service-closing-actions { justify-content: center; }
    .service-trust-grid { grid-template-columns: repeat(2, 1fr); }
    .about-text-cols { grid-template-columns: 1fr; gap: 0; }
    .features-grid,
    .services-grid,
    .testimonials-grid,
    .insurance-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
    .cta-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .cta-actions { justify-content: center; }
    .sitemap-columns { grid-template-columns: 1fr 1fr; gap: 2rem 3rem; }
}

@media (max-width: 860px) {
    .topbar-contact .topbar-address,
    .topbar-contact a:nth-child(2) { display: none; }
}
/* ===== Tablet portrait & mobile (<= 768px) ===== */
@media (max-width: 768px) {
    :root {
        --fs-4xl: 2.5rem;
        --fs-3xl: 2.15rem;
        --fs-2xl: 1.75rem;
        --fs-xl: 1.4rem;
        --section-y: 3.25rem;
        --header-h: 68px;
        --gutter: 30px;
    }

    /* Topbar collapses to phone+social on mobile */
    .topbar-contact { gap: 0.85rem; }
    .topbar-inner { justify-content: space-between; }

    /* Mobile nav */
    .nav-toggle { display: inline-flex; }
    .primary-nav {
        position: absolute;
        top: var(--header-h);
        left: 0; right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 1rem var(--gutter) 1.5rem;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--color-border);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: max-height 300ms ease, opacity 200ms ease;
    }
    .primary-nav.open {
        min-height: 350px;
        opacity: 1;
        overflow: scroll;
    }
    .primary-nav ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
    }
    .primary-nav ul a {
        display: block;
        padding: 0.85rem 0.5rem;
        border-bottom: 1px solid var(--color-border);
    }
    .primary-nav ul a::after { display: none; }
    .primary-nav ul a.active { color: var(--color-primary-dark); }
    .nav-cta { margin-top: 1rem; width: 100%; }

    /* Services dropdown on mobile: collapsible accordion */
    .primary-nav .has-dropdown { position: relative; }
    .primary-nav .has-dropdown > .nav-parent {
        padding-right: 3rem;
    }
    .primary-nav .nav-caret { display: none; }
    .primary-nav .dropdown-toggle {
        display: inline-flex;
        position: absolute;
        top: 0;
        right: 0;
        width: 48px;
        height: 51px;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: 0;
        border-bottom: 1px solid var(--color-border);
        color: var(--color-text-muted);
        cursor: pointer;
        font-size: 0.85rem;
    }
    .primary-nav .dropdown-toggle i { transition: transform var(--transition); }
    .primary-nav .has-dropdown.is-open .dropdown-toggle i { transform: rotate(180deg); }

    .primary-nav .dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: 0;
        padding: 0;
        background: transparent;
        max-height: 0;
        overflow: hidden;
        transition: max-height 280ms ease;
    }
    .primary-nav .has-dropdown.is-open .dropdown { max-height: 720px; }
    .primary-nav .dropdown a {
        padding: 0.7rem 1.25rem;
        border-bottom: 1px solid var(--color-border);
        font-size: var(--fs-sm);
        color: var(--color-text-soft);
    }
    .primary-nav .dropdown a i { color: var(--color-primary-dark); }

    .hero { }
    .hero-title { font-size: var(--fs-3xl); }
    .hero-cta .btn { flex: 1 1 auto; }
    .hero-badge { left: 0.5rem; bottom: 0.75rem; }

    .features-grid,
    .services-grid,
    .testimonials-grid,
    .insurance-grid {
        grid-template-columns: 1fr;
    }
    .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .ba-grid { grid-template-columns: 1fr; }

    .form-row { grid-template-columns: 1fr; }
    .card { padding: 1.5rem; }

    .about-stat,
    .doctor-credential,
    .hero-badge { right: 0.5rem; }

    .footer-grid { grid-template-columns: 1fr; gap: 2rem; padding-bottom: 2rem; }
    .footer-bottom-inner { justify-content: center; text-align: center; flex-direction: column; gap: 0.75rem; }
    .footer-bottom-inner p { width: 100%; }
    .footer-legal-links { justify-content: center; gap: 1.25rem; }

    .sitemap-columns { grid-template-columns: 1fr; gap: 2rem; }
    .section-head { margin-bottom: 2rem; }
    .service-detail-actions .btn { flex: 1 1 auto; }
    .service-trust-grid { grid-template-columns: 1fr; }
    .service-closing-actions .btn { flex: 1 1 auto; }
    .service-pullquote { padding: 1.75rem 1.25rem 1.5rem; }
    .service-pullquote blockquote { font-size: 1.15rem; }
    .breadcrumbs { font-size: var(--fs-xs); }
}

/* ===== Buttons full-width at 575px ===== */
@media (max-width: 575px) {
    .btn { width: 100%; justify-content: center; }
}

/* ===== Small mobile (<= 480px) ===== */
@media (max-width: 480px) {
    :root {
        --fs-4xl: 2.15rem;
        --fs-3xl: 1.9rem;
        --fs-2xl: 1.55rem;
    }
    .topbar { font-size: 0.75rem; }
    .topbar-contact a:nth-child(2) { display: none; } /* hide email on tiny screens */
    .brand-text strong { font-size: 1rem; }
    .brand-text small { font-size: 0.65rem; }
    .brand img { max-width: 200px;}

    .gallery-grid { grid-template-columns: 1fr; }

    .hero-cta { flex-direction: column; }
    .hero-cta .btn { width: 100%; }
    .hero-trust { gap: 0.85rem; }
    .hero-trust li { font-size: var(--fs-xs); }

    .btn-lg { padding: 0.85rem 1.25rem; font-size: var(--fs-sm); }

    .feature-card,
    .testimonial-card,
    .insurance-card { padding: 1.5rem; }

    .back-to-top {
        width: 42px; height: 42px;
        right: 0.85rem;
        bottom: 0.85rem;
    }

    .ba-grid { grid-template-columns: 1fr; }
    .ba-pair-images { grid-template-columns: 1fr; }
    .ba-pair-img + .ba-pair-img { border-left: none; border-top: 2px solid var(--color-bg-alt); }
    .ba-pair-caption-row { grid-template-columns: 1fr; gap: 0.5rem; }
}