/* ================================================================
   CARBOVEXX — Mobile-First Responsive System
   Breakpoints:
     xs:  ≤ 480px  (small phones)
     sm:  ≤ 640px  (phones)
     md:  ≤ 768px  (tablets portrait)
     lg:  ≤ 1024px (tablets landscape / small laptops)
   ================================================================ */

/* ── 1. BASE MOBILE DEFAULTS (applied to ALL screens first) ────── */

/* Prevent horizontal scroll site-wide */
html, body { overflow-x: hidden; width: 100%; }

/* Better tap targets on touch devices */
a, button, [role="button"] { -webkit-tap-highlight-color: transparent; }

/* ── 2. LARGE TABLET (≤ 1024px) ────────────────────────────────── */
@media (max-width: 1024px) {

  /* Container */
  .container { width: 92%; }

  /* ── Sections ── */
  section { padding: 80px 0; }

  /* ── Hero (index) ── */
  .hero-content {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 80px;
    text-align: center;
  }
  .hero-left { align-items: center; }
  .hero-desc { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-trust { justify-content: center; }
  .hero-right { display: none; }

  /* ── Intro 2-col grid ── */
  .intro-section > .container > div[style*="grid-template-columns:1fr 1fr"] {
    grid-template-columns: 1fr !important;
    gap: 40px !important;
  }

  /* ── Grids ── */
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }

  /* ── Applications ── */
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  div[style*="grid-template-columns:1fr 2fr"] {
    grid-template-columns: 1fr !important;
    gap: 40px !important;
  }

  /* ── Export Section ── */
  .export-layout { grid-template-columns: 1fr; gap: 48px; }

  /* ── FAQ ── */
  .faq-layout { grid-template-columns: 1fr; gap: 48px; }

  /* ── Featured Products ── */
  .fp-cards-grid { grid-template-columns: 1fr; gap: 28px; }
  .fp-trust-divider { display: none; }
  .fp-trust-bar { gap: 8px; }

  /* ── Footer ── */
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }

  /* ── About page ── */
  .product-range-grid { grid-template-columns: repeat(2, 1fr) !important; }
  .why-grid { grid-template-columns: repeat(2, 1fr) !important; }
  .commit-grid { grid-template-columns: 1fr !important; gap: 40px !important; }
  .mv-grid { grid-template-columns: 1fr !important; }
  div[style*="grid-template-columns:1fr 1fr;gap:80px"] {
    grid-template-columns: 1fr !important;
    gap: 48px !important;
  }
  div[style*="grid-template-columns:1fr 1.5fr"] {
    grid-template-columns: 1fr !important;
    gap: 40px !important;
  }
  div[style*="grid-template-columns:1.2fr 1fr"] {
    grid-template-columns: 1fr !important;
    gap: 40px !important;
  }
  .app-list-grid { grid-template-columns: 1fr !important; }

  /* ── Contact page ── */
  .contact-layout { grid-template-columns: 1fr !important; gap: 36px !important; }
  .contact-sidebar { position: static !important; order: -1; }
  .form-row-2 { grid-template-columns: 1fr 1fr; }
}

/* ── 3. TABLET PORTRAIT & PHONES (≤ 768px) ─────────────────────── */
@media (max-width: 768px) {

  :root { --nav-height: 64px; }

  /* Container */
  .container { width: 92%; }

  /* Sections */
  section { padding: 60px 0; }

  /* Typography */
  .section-title { font-size: clamp(1.6rem, 4.8vw, 2.2rem); }
  .section-subtitle { font-size: 0.95rem; }

  /* ── Navbar ── */
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-logo-img { height: 44px; }

  /* ── Hero ── */
  .hero { min-height: 90vh; }
  .hero-title { font-size: clamp(1.8rem, 6.5vw, 3rem); text-align: center; }
  .hero-desc { font-size: 0.95rem; text-align: center; }
  .hero-eyebrow { justify-content: center; }
  .hero-scroll { display: none; }
  .hero-actions { flex-direction: column; align-items: center; gap: 12px; }
  .hero-actions .btn { width: 100%; max-width: 320px; justify-content: center; }

  /* ── Stats Bar ── */
  .stat-item { padding: 28px 16px; }
  .stat-number { font-size: 2.2rem; }

  /* ── Grids ── */
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }

  /* ── Products Section ── */
  .products-section { padding: 60px 0; }

  /* ── Applications ── */
  .app-grid { grid-template-columns: 1fr; }

  /* ── Featured Products ── */
  .featured-products { padding: 60px 0; }
  .fp-trust-bar { padding: 18px 16px; flex-wrap: wrap; gap: 12px; }
  .fp-trust-item { min-width: calc(50% - 12px); padding: 10px 8px; }
  .fp-card-image-wrap { height: 220px; }
  .fp-card-body { padding: 20px 20px 22px; }
  .fp-tagline-wrap {
    padding: 24px 20px;
    flex-direction: column;
    text-align: center;
    gap: 20px;
    align-items: center;
  }
  .fp-tagline-left { flex-direction: column; text-align: center; align-items: center; }
  .fp-tagline-text { font-size: 1.05rem; }
  .fp-tagline-wrap .btn { width: 100%; justify-content: center; max-width: 280px; }

  /* ── Export Section ── */
  .export-cta-box { padding: 32px 24px; }

  /* ── FAQ ── */
  .faq-question { font-size: 0.95rem; }

  /* ── CTA Section ── */
  .cta-section { padding: 72px 0; }
  .cta-actions { flex-direction: column; align-items: center; gap: 12px; }
  .cta-actions .btn { width: 100%; max-width: 300px; justify-content: center; }
  .cta-specs { gap: 20px; }

  /* ── Footer ── */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  footer { padding: 60px 0 28px; }
  .footer-bottom { flex-direction: column; text-align: center; gap: 8px; }
  .footer-brand p { max-width: 100%; }

  /* ── About Hero ── */
  .about-hero h1 { font-size: clamp(1.8rem, 6vw, 3rem) !important; }
  .product-range-grid { grid-template-columns: repeat(2, 1fr) !important; }
  .why-grid { grid-template-columns: 1fr !important; }

  /* ── Contact layout ── */
  .contact-layout { grid-template-columns: 1fr !important; }
  .contact-hero h1 { font-size: clamp(1.8rem, 6vw, 2.8rem) !important; }

  /* ── Intro 2-col ── */
  div[style*="grid-template-columns:1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
  div[style*="grid-template-columns:1fr 1.8fr"],
  div[style*="grid-template-columns:1.7fr 1fr"],
  div[style*="grid-template-columns:1.6fr 1fr"] {
    grid-template-columns: 1fr !important;
  }

  /* Cards padding */
  .card { padding: 24px 20px; }
  .mv-card { padding: 28px 22px !important; }
}

/* ── 4. SMALL PHONES (≤ 640px) ──────────────────────────────────── */
@media (max-width: 640px) {

  /* Section spacing */
  section { padding: 52px 0; }

  /* ── About ── */
  .product-range-grid { grid-template-columns: 1fr 1fr !important; }

  /* ── Contact form ── */
  .form-row-2 { grid-template-columns: 1fr !important; }
  .form-tabs { flex-direction: column; gap: 4px; }
  .form-tab { padding: 10px 16px; }
  .contact-info-panel { display: block !important; }

  /* ── Stat grid ── */
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { padding: 22px 12px; }
  .stat-number { font-size: 2rem; }
  .stat-label { font-size: 0.7rem; }
}

/* ── 5. EXTRA SMALL (≤ 480px) ───────────────────────────────────── */
@media (max-width: 480px) {

  :root { --nav-height: 60px; }

  .container { width: 94%; }

  /* Typography */
  .section-title { font-size: clamp(1.45rem, 5.5vw, 2rem); letter-spacing: -0.01em; }
  .hero-title { font-size: clamp(1.6rem, 7.5vw, 2.4rem); }

  /* Buttons */
  .btn { padding: 12px 20px; font-size: 0.88rem; }
  .btn-sm { padding: 9px 16px; font-size: 0.8rem; }

  /* Sections */
  section { padding: 44px 0; }
  footer { padding: 48px 0 24px; }

  /* ── Hero ── */
  .hero { min-height: 85vh; }
  .hero-eyebrow-text { font-size: 0.62rem; letter-spacing: 0.2em; }
  .hero-trust { gap: 12px; }
  .hero-trust-item { font-size: 0.75rem; }
  .hero-trust-divider { height: 14px; }

  /* ── Stats ── */
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { padding: 20px 10px; }
  .stat-number { font-size: 1.8rem; }

  /* ── Products ── */
  .product-icon { width: 52px; height: 52px; font-size: 1.5rem; }

  /* ── Featured Products ── */
  .fp-trust-item { min-width: calc(50% - 8px); }
  .fp-trust-icon { width: 40px; height: 40px; }
  .fp-trust-icon svg { width: 18px; height: 18px; }
  .fp-trust-item span { font-size: 0.68rem; }
  .fp-card-image-wrap { height: 200px; }
  .fp-card-title { font-size: 1.1rem; }
  .fp-card-body { padding: 16px 16px 18px; }
  .fp-features { gap: 8px; }
  .fp-feature { font-size: 0.85rem; }
  .fp-tagline-text { font-size: 0.95rem; }
  .fp-tagline-sub { font-size: 0.72rem; }

  /* ── Application items ── */
  .app-item { padding: 18px 14px; }
  .app-num { font-size: 1.2rem; min-width: 28px; }

  /* ── Export ── */
  .export-item { padding: 14px 16px; }
  .export-cta-box { padding: 28px 18px; }
  .export-cta-box h3 { font-size: 1.35rem; }
  .supply-specs .spec-row { font-size: 0.82rem; }

  /* ── Why cards ── */
  .why-num { font-size: 2.4rem; }

  /* ── FAQ ── */
  .faq-question { font-size: 0.9rem; padding: 18px 0; }

  /* ── CTA ── */
  .cta-layout h2 { font-size: clamp(1.5rem, 5.5vw, 2.2rem); }
  .cta-layout p { font-size: 0.92rem; }
  .cta-specs { gap: 16px; }

  /* ── Footer ── */
  .footer-title { font-size: 0.8rem; }
  .footer-links a { font-size: 0.85rem; }
  .footer-bottom p { font-size: 0.75rem; }

  /* ── About page cards ── */
  .product-range-grid { grid-template-columns: 1fr 1fr !important; gap: 12px !important; }
  .pr-card { padding: 20px 16px !important; }
  .pr-emoji { font-size: 1.6rem !important; }
  .pr-card h4 { font-size: 0.88rem !important; }
  .pr-card p { font-size: 0.78rem !important; }

  /* ── About stat mini-grid ── */
  div[style*="grid-template-columns:1fr 1fr;gap:18px"] {
    grid-template-columns: 1fr 1fr !important;
    gap: 10px !important;
  }
  div[style*="grid-template-columns:1fr 1fr;gap:18px"] > div {
    padding: 14px !important;
  }

  /* ── Contact sidebar ── */
  .contact-info-panel { padding: 18px 14px !important; }
  .info-card { padding: 20px 16px !important; }
  .form-tabs { flex-direction: column; }
  .form-tab { font-size: 0.8rem; padding: 10px; }

  /* ── Mobile nav links ── */
  .mobile-nav .nav-link { font-size: 1.35rem; }

  /* ── Toast ── */
  .toast { bottom: 16px; right: 16px; left: 16px; max-width: unset; }

  /* ── Section tag ── */
  .section-tag { font-size: 0.62rem; letter-spacing: 0.18em; }
}

/* ── 6. ULTRA SMALL (≤ 360px) ───────────────────────────────────── */
@media (max-width: 360px) {

  .container { width: 96%; }
  .hero-title { font-size: 1.5rem; }
  .fp-trust-item { min-width: calc(50% - 6px); padding: 6px 4px; }
  .fp-trust-item span { font-size: 0.6rem; }
  .stat-number { font-size: 1.6rem; }
  .btn { padding: 11px 16px; font-size: 0.82rem; }
  .product-range-grid { grid-template-columns: 1fr !important; }
}

/* ── 7. PERFORMANCE: reduce-motion ──────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ── 8. TOUCH DEVICES: disable complex hover effects ────────────── */
@media (hover: none) and (pointer: coarse) {
  .card:hover { transform: none; box-shadow: var(--shadow-xs); }
  .btn:hover { transform: none; }
  .fp-card:hover { transform: none; }
  .fp-card:hover .fp-card-img { transform: none; }
  .app-item:hover { transform: none; }
  .export-item:hover { transform: none; }
  .why-item:hover { transform: none; }
  .mv-card:hover { transform: none; }
  .pr-card:hover { transform: none; }

  /* Keep overlay always slightly visible on touch */
  .fp-card-img-overlay { opacity: 0.6; }
  .fp-card:hover .fp-card-img-overlay { opacity: 0.6; }

  /* Features don't slide on touch — just show */
  .fp-card:hover .fp-feature { transform: none; }
}

/* ── 9. PRINT ────────────────────────────────────────────────────── */
@media print {
  .navbar, .mobile-nav, .hero-scroll, .hero-particles,
  .page-transition, #page-loader { display: none !important; }
  section { padding: 24px 0; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .container { max-width: 100%; width: 100%; }
  footer { padding: 20px 0; }
}