/* ============================================================
   CalBD Theme — responsive.css
   Mobile-first breakpoints for all components
   ============================================================ */

/* ── xl — Large desktop (1200px+) ───────────────────────────── */
@media (min-width: 1200px) {
    :root {
        --container-pad: var(--sp-8);
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .calc-page-title {
        font-size: var(--text-5xl);
    }
}

/* ── lg — Desktop (1024px+) ─────────────────────────────────── */
@media (min-width: 1024px) {
    .calc-two-col {
        grid-template-columns: 1fr 280px;
    }
}

/* ── md — Tablet (768px - 1024px) ───────────────────────────── */
@media (max-width: 1024px) {
    .calc-two-col {
        grid-template-columns: 1fr;
    }

    .calc-sidebar {
        position: static;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--sp-4);
    }

    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        display: none;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-search {
        justify-content: center;
    }

    .hero-search form {
        max-width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--sp-8);
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .archive-hero-title {
        font-size: var(--text-3xl);
    }
}

/* ── sm — Mobile (< 768px) ───────────────────────────────────── */
@media (max-width: 767px) {
    :root {
        --container-pad: var(--sp-4);
        --header-h: 60px;
    }

    /* Header */
    .header-search {
        display: none;
    }

    .site-nav {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        z-index: var(--z-dropdown);
        transform: translateX(-100%);
        transition: transform var(--ease-normal);
        overflow-y: auto;
        padding: var(--sp-6) var(--sp-4);
    }

    .site-nav.is-open {
        transform: translateX(0);
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--sp-1);
    }

    .nav-list li {
        width: 100%;
    }

    .nav-list li a {
        display: block;
        padding: var(--sp-3) var(--sp-4);
        font-size: var(--text-lg);
        border-radius: var(--radius-lg);
    }

    .nav-toggle {
        display: flex;
    }

    /* Hero */
    .hero-section {
        padding: var(--sp-12) 0 var(--sp-10);
    }

    .hero-title {
        font-size: var(--text-3xl);
    }

    .hero-desc {
        font-size: var(--text-base);
    }

    .hero-stats {
        gap: var(--sp-5);
    }

    .hero-stat-num {
        font-size: var(--text-xl);
    }

    /* Calculator page */
    .calc-page-title {
        font-size: var(--text-2xl);
    }

    .calc-card-header {
        padding: var(--sp-5) var(--sp-5);
    }

    .calc-card-title {
        font-size: var(--text-xl);
    }

    .calc-card-body {
        padding: var(--sp-4) var(--sp-5);
    }

    .calc-card-footer {
        padding: 0 var(--sp-5) var(--sp-5);
        flex-wrap: wrap;
    }

    .btn-calculate {
        min-width: 0;
    }

    /* Inputs - large tap targets on mobile */
    .calc-card-body input[type="number"],
    .calc-card-body input[type="text"],
    .calc-card-body select,
    .calbd-input {
        font-size: var(--text-xl);
        padding: var(--sp-4) var(--sp-4);
        min-height: 56px;
    }

    /* Grid */
    .calbd-grid,
    .calc-inputs-grid {
        grid-template-columns: 1fr;
    }

    .calbd-grid-3 {
        grid-template-columns: 1fr 1fr;
    }

    /* Result */
    .result-card {
        padding: var(--sp-5);
    }

    .result-value {
        font-size: 2.5rem;
    }

    .result-breakdown {
        grid-template-columns: 1fr 1fr;
    }

    .result-actions {
        gap: var(--sp-2);
    }

    .result-actions .btn-action {
        font-size: var(--text-xs);
        padding: var(--sp-2) var(--sp-3);
    }

    /* Sticky bar — shown on mobile */
    .sticky-result-bar {
        display: flex;
    }

    /* Share */
    .share-card {
        padding: var(--sp-5);
    }

    .share-url-row {
        flex-direction: column;
    }

    .share-copy-btn {
        width: 100%;
        justify-content: center;
    }

    .share-platforms {
        gap: var(--sp-2);
    }

    .share-platforms .share-btn span {
        display: none;
    }

    .share-platforms .share-btn {
        padding: var(--sp-2) var(--sp-3);
    }

    /* Formula */
    .formula-card {
        padding: var(--sp-5);
    }

    .calbd-formula {
        font-size: var(--text-base);
    }

    /* FAQ */
    .calc-faq-section {
        padding: var(--sp-5);
    }

    .faq-question {
        padding: var(--sp-3) var(--sp-4);
        font-size: var(--text-sm);
    }

    /* Related */
    .related-grid {
        grid-template-columns: 1fr 1fr;
    }

    /* TOC */
    .calbd-toc {
        padding: var(--sp-3) var(--sp-4);
    }

    /* Calc grid on archive */
    .calc-grid {
        grid-template-columns: 1fr;
    }

    /* Archive hero */
    .archive-hero {
        padding: var(--sp-8) 0 var(--sp-6);
    }

    .archive-hero-title {
        font-size: var(--text-2xl);
    }

    .archive-hero-desc {
        font-size: var(--text-base);
    }

    /* Single post */
    .single-post-thumbnail {
        margin-bottom: var(--sp-5);
        border-radius: var(--radius-lg);
    }

    .calc-page-title {
        font-size: var(--text-2xl);
    }

    /* View All */
    .section-view-all .btn {
        width: 100%;
        justify-content: center;
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--sp-6);
    }

    .footer-brand {
        grid-column: auto;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--sp-2);
    }

    .footer-email-form {
        flex-wrap: wrap;
    }

    .footer-email-input {
        min-width: 0;
        flex: 1;
    }

    /* Section heading */
    .section-heading h2 {
        font-size: var(--text-base);
    }

    .calc-page-layout {
        padding-top: var(--sp-5);
    }

    /* Breadcrumb */
    .breadcrumb-item a {
        font-size: var(--text-xs);
    }

    .breadcrumb-item span {
        font-size: var(--text-xs);
    }
}

/* ── xs — Very small phones (< 480px) ───────────────────────── */
@media (max-width: 479px) {
    .hero-title {
        font-size: var(--text-2xl);
    }

    .calc-card-title {
        font-size: var(--text-lg);
    }

    .result-value {
        font-size: 2rem;
    }

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

    .hero-stats {
        flex-wrap: wrap;
        gap: var(--sp-4);
    }

    .calbd-grid-3 {
        grid-template-columns: 1fr;
    }
}

/* ── Hover-capable devices only ─────────────────────────────── */
@media (hover: none) {
    .calc-listing-card:hover {
        transform: none;
    }

    .btn-primary:hover {
        transform: none;
    }

    .related-card:hover {
        transform: none;
    }
}

/* ── Reduced motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ── Dark mode (auto) ───────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
    :root {
        --clr-bg: #0f172a;
        --clr-surface: #1e293b;
        --clr-surface-2: #263045;
        --clr-border: #334155;
        --clr-text: #f1f5f9;
        --clr-text-2: #94a3b8;
        --clr-text-3: #64748b;
        --clr-primary-light: rgba(26, 86, 219, 0.15);
    }

    .site-header {
        background: rgba(15, 23, 42, 0.95);
    }

    .search-form {
        background: var(--clr-surface-2);
    }

    .calc-card {
        background: var(--clr-surface);
        border-color: var(--clr-border);
    }

    .calc-listing-card {
        background: var(--clr-surface);
    }

    .share-card,
    .formula-card,
    .calc-faq-section {
        background: var(--clr-surface);
    }

    .related-card {
        background: var(--clr-surface);
    }

    .calbd-toc {
        background: var(--clr-surface);
    }

    .faq-question {
        background: var(--clr-surface);
        color: var(--clr-text);
    }

    .faq-question:hover {
        background: var(--clr-surface-2);
    }

    .faq-item.is-open .faq-question {
        background: rgba(26, 86, 219, 0.2);
    }

    .share-url-field {
        background: var(--clr-surface-2);
        color: var(--clr-text);
    }

    .listing-thumb-placeholder {
        background: linear-gradient(135deg, rgba(26, 86, 219, 0.2), rgba(124, 58, 237, 0.15));
    }

    .listing-thumb-calendar {
        background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(6, 182, 212, 0.15));
    }

    .filter-tab {
        background: var(--clr-surface);
        color: var(--clr-text-2);
    }

    /* Nav in dark */
    .nav-list li a {
        color: var(--clr-text-2);
    }

    .nav-list li a:hover {
        background: rgba(26, 86, 219, 0.15);
    }

    /* Hero mockup in dark stays same since dark bg already */
    .hero-mockup {
        background: rgba(255, 255, 255, 0.04);
    }

    /* Single post dark */
    .single-post-thumbnail {
        border-color: var(--clr-border);
    }

    .post-tag {
        background: var(--clr-surface-2);
        border-color: var(--clr-border);
    }

    .calc-seo-intro {
        background: var(--clr-surface);
        border-color: var(--clr-border);
    }

    .card-calendar:hover {
        border-color: var(--clr-secondary);
    }
}