/* ==========================================================================
   TechZTalk — Responsive rules
   Breakpoints: 1200 · 992 · 768 · 576 · 375
   ========================================================================== */

/* ≤1200px — laptop */
@media (max-width: 1200px) {
  .header-inner { gap: 18px; }
  .header-search .input { width: 150px; }
  .header-search .input:focus { width: 200px; }
  .header-search kbd { display: none; }
  .main-nav a { padding: 0 10px; }
  .grid-4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.4fr repeat(4, 1fr); gap: 28px; }
  .detail-layout { grid-template-columns: minmax(0, 1fr) 300px; gap: 32px; }
}

/* ≤1080px — collapse desktop nav into panel */
@media (max-width: 1080px) {
  .main-nav, .header-search, .header-actions .hide-md { display: none; }
  .nav-toggle, .search-toggle { display: grid; }
  .header-actions { margin-left: auto; }

  .mobile-panel { display: block; position: fixed; inset: var(--header-h) 0 0 0; max-width: 100vw; background: #fff; z-index: 99; overflow-y: auto; padding: 16px 24px 32px; opacity: 0; transform: translateY(-8px); visibility: hidden; transition: opacity .2s, transform .25s var(--ease), visibility .25s; border-top: 1px solid var(--border); }
  .mobile-panel.is-open { opacity: 1; transform: none; visibility: visible; }
  .mobile-panel .search-inline { margin-bottom: 16px; }
  .mobile-panel ul { list-style: none; display: grid; gap: 2px; }
  .mobile-panel .m-link { display: flex; align-items: center; gap: 12px; padding: 14px 12px; border-radius: 10px; color: var(--secondary); font-weight: 650; }
  .mobile-panel .m-link:hover, .mobile-panel .m-link[aria-current="page"] { background: var(--primary-50); color: var(--primary); }
  .mobile-panel .m-link svg { color: var(--muted); }
  .mobile-panel .m-sub { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 6px 0 10px 12px; }
  .mobile-panel .m-sub a { font-size: var(--fs-sm); color: var(--muted); padding: 8px 12px; border-radius: 8px; font-weight: 550; }
  .mobile-panel .m-sub a:hover { background: var(--surface); color: var(--primary); }
  .mobile-panel .m-actions { display: grid; gap: 10px; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); }
  .mobile-search { position: absolute; left: 0; right: 0; top: 100%; background: #fff; padding: 12px 24px 16px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); display: none; }
  .mobile-search.is-open { display: block; }
  body.nav-open { overflow: hidden; }
}

/* ≤992px — tablet landscape */
@media (max-width: 992px) {
  :root { --fs-4xl: 2.6rem; --fs-3xl: 2rem; }
  .section { padding: 64px 0; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
  .ai-panel { grid-template-columns: 1fr; }
  .ai-tabs { flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--border); scrollbar-width: none; }
  .ai-tabs [role="tab"] { white-space: nowrap; flex-shrink: 0; }
  .ai-tabs [role="tab"] .count { display: none; }
  .steps { grid-template-columns: 1fr; gap: 16px; }
  .cta-band { grid-template-columns: 1fr; padding: 48px; }
  .footer-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-brand { grid-column: 1 / -1; }

  /* Directory: filters become a drawer */
  .directory { grid-template-columns: 1fr; gap: 0; }
  .filter-trigger { display: inline-flex; }
  .filters { position: fixed; top: 0; bottom: 0; left: 0; width: min(360px, 90vw); max-height: none; border-radius: 0 var(--radius-lg) var(--radius-lg) 0; z-index: 160; transform: translateX(-105%); transition: transform .28s var(--ease); box-shadow: var(--shadow-lg); }
  .filters.is-open { transform: none; }
  .filters-foot { display: flex; }
  .filters-foot .btn { flex: 1; }
  .filters .close-drawer { display: grid !important; }

  .detail-layout { grid-template-columns: minmax(0, 1fr); }
  .detail-aside { position: static; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
  .detail-aside .sidebar-card { margin: 0; }
  .detail-head { flex-wrap: wrap; }
  .detail-actions { width: 100%; }

  .submit-layout { grid-template-columns: 1fr; gap: 24px; }
  .stepper { position: static; grid-auto-flow: column; grid-auto-columns: 1fr; overflow-x: auto; padding: 8px; }
  .stepper li { flex-direction: column; text-align: center; gap: 6px; padding: 10px 6px; }
  .stepper small { display: none; }
  .stepper strong { font-size: var(--fs-xs); }

  .auth { grid-template-columns: 1fr; }
  .auth-aside { display: none; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
  .price-card .plan-desc { min-height: 0; }
  .seo-copy { columns: 1; }
  .rating-summary { grid-template-columns: 1fr; gap: 20px; }
}

/* ≤768px — tablet portrait */
@media (max-width: 768px) {
  :root { --fs-4xl: 2.2rem; --fs-3xl: 1.8rem; --fs-2xl: 1.5rem; --header-h: 62px; }
  .container { padding: 0 20px; }
  .section { padding: 56px 0; }
  .hero { padding: 56px 0 48px; }
  .hero-lead { font-size: var(--fs-base); margin-bottom: 28px; }
  .search-box .search-select { display: none; }
  .search-box input { font-size: var(--fs-base); }
  .section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .section-head.center { align-items: center; }
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .results-grid { grid-template-columns: minmax(0, 1fr); }
  .product-card.is-list { flex-direction: column; align-items: stretch; }
  .product-card.is-list .pc-foot { flex-direction: row; align-items: center; border-top: 1px solid var(--border); padding-top: 14px; }
  .product-card.is-list .pc-tools { position: absolute; }
  .view-toggle { display: none; }
  .ai-content [role="tabpanel"] { grid-template-columns: 1fr; }
  .cta-band { padding: 36px 28px; border-radius: 22px; }
  .cta-band h2 { font-size: 1.75rem; }
  .detail-head .logo-ph { --s: 72px; border-radius: 18px; font-size: 26px; }
  .detail-title h1 { font-size: 1.75rem; }
  .detail-aside { grid-template-columns: minmax(0, 1fr); }
  .feature-grid, .plan-grid { grid-template-columns: 1fr; }
  .plan-grid { gap: 20px; }
  .shots { grid-template-columns: 1fr 1fr; grid-template-rows: auto; }
  .shots .shot:first-child { grid-column: 1 / -1; grid-row: auto; aspect-ratio: 16 / 10; }
  .form-card { padding: 24px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .preview-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .alt-card { grid-template-columns: auto minmax(0, 1fr); }
  .alt-card .alt-side { grid-column: 1 / -1; flex-direction: row; }
  .alt-card .alt-side .btn { flex: 1; }
  .category-hero-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .pros-cons { grid-template-columns: 1fr; }
  .toast-region { left: 16px; right: 16px; top: 76px; }
  .toast { max-width: none; }
}

/* ≤576px — large phones */
@media (max-width: 576px) {
  :root { --fs-4xl: 1.95rem; --fs-3xl: 1.6rem; }
  .container { padding: 0 16px; }
  .hero-pill { font-size: 11px; }
  .search-box { padding: 6px 6px 6px 14px; border-radius: 14px; }
  .search-box input { height: 44px; }
  .search-box .btn { width: 44px; padding: 0; }
  .search-box .btn .btn-label { display: none; }
  .popular > span { width: 100%; text-align: center; margin: 0; }
  .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .grid-auto { grid-template-columns: minmax(0, 1fr); }
  .cat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; gap: 12px; }
  .cat-card { flex-direction: column; align-items: flex-start; gap: 10px; padding: 16px; }
  .cat-card .arrow { display: none; }
  .stat { padding: 20px 12px; }
  .stat-value { font-size: 1.6rem; }
  .header-actions .btn-primary .btn-label { display: none; }
  .header-actions .btn-primary { width: 40px; padding: 0; }
  .results-bar { align-items: stretch; }
  .results-tools { width: 100%; }
  .results-tools .select { flex: 1; min-width: 0; }
  .detail-actions .btn { flex: 1; }
  .detail-actions .btn-icon { flex: 0 0 44px; }
  .detail-nav a { padding: 12px 12px; }
  .shots { grid-template-columns: 1fr; }
  .preview-grid { grid-template-columns: 1fr; }
  .form-nav .btn { flex: 1; }
  .modal-body { padding: 20px; }
  .compare-bar { left: 16px; right: 16px; transform: translateY(140%); max-width: none; padding: 10px 10px 10px 14px; gap: 10px; }
  .compare-bar.is-visible { transform: none; }
  .compare-bar .cb-text { display: none; }
  .compare-bar .btn { margin-left: auto; }
  .price-card { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px 16px; }
  .newsletter { flex-direction: column; }
  .not-found .code { font-size: 5.5rem; }
  .cc-facts { grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 10px; }
  .page-hero { padding: 32px 0 28px; }
  .page-hero p { font-size: var(--fs-base); }
  .table th, .table td { padding: 12px 14px; }
}

/* ≤375px — small phones */
@media (max-width: 375px) {
  .brand { font-size: 1.05rem; }
  .brand-mark { width: 30px; height: 30px; }
  .header-actions { gap: 4px; }
  .cat-grid { grid-template-columns: 1fr !important; }
  .cat-card { flex-direction: row; align-items: center; }
  .pc-foot { flex-direction: column; align-items: stretch; }
  .pc-actions .btn { flex: 1; }
  .footer-grid { grid-template-columns: 1fr; }
  .stepper .s-num { width: 28px; height: 28px; font-size: var(--fs-xs); }
  .stepper strong { font-size: 10px; }
}

/* Phase 2 responsive additions */
@media (max-width: 992px) {
  .stepper .step-btn { flex-direction: column; text-align: center; gap: 6px; }
}
@media (max-width: 576px) {
  .header-search .suggest, .suggest { width: auto; left: 0; right: 0; }
  .alt-hero { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 576px) {
  .review-head { flex-wrap: wrap; }
  .review-head .stars { margin-left: 58px; }
  .rating-summary .score { font-size: 3rem; }
}