/* ============================================
   BestRoofingCalculators.com - Responsive Styles
   Mobile-First Breakpoints
   ============================================ */

/* --- Base Mobile Styles --- */
.section { padding: var(--sp-10) var(--sp-4); }
.calculator-grid { gap: var(--sp-4); }
.calculator-card { padding: var(--sp-5); }
.calculator-card .card-icon { font-size: var(--fs-3xl); margin-bottom: var(--sp-3); }
.calculator-card h3 { font-size: var(--fs-base); margin-bottom: var(--sp-2); }
.calculator-card p { font-size: var(--fs-xs); margin-bottom: var(--sp-3); }

/* --- Small devices (landscape phones, 576px+) --- */
@media (min-width: 576px) {
  .section { padding: var(--sp-20) var(--sp-6); }
  .calculator-grid { gap: var(--sp-6); }
  .calculator-card { padding: var(--sp-6); }
  .calculator-card .card-icon { font-size: var(--fs-4xl); margin-bottom: var(--sp-4); }
  .calculator-card h3 { font-size: var(--fs-lg); margin-bottom: var(--sp-3); }
  .calculator-card p { font-size: var(--fs-sm); margin-bottom: var(--sp-5); }

  .form-row {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .diagram-container { padding: var(--sp-5); }
}

/* --- Medium devices (tablets, 768px+) --- */
@media (min-width: 768px) {
  :root {
    --font-size-3xl: 2.25rem;
    --font-size-4xl: 2.75rem;
  }

  h1 {
    font-size: var(--font-size-4xl);
  }

  .content-wrapper {
    grid-template-columns: 1fr;
    padding: var(--space-2xl) 0;
  }

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

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

  .form-row.gap-sm {
    gap: var(--space-sm);
  }
}

/* --- Large devices (desktops, 992px+) --- */
@media (min-width: 992px) {
  .content-wrapper {
    grid-template-columns: 1fr var(--sidebar-width);
  }

  .nav-toggle {
    display: none !important;
  }

  .main-nav ul {
    display: flex !important;
  }

  .main-nav .submenu {
    display: none !important;
  }

  .has-submenu:hover > .submenu {
    display: block !important;
  }

  h1 {
    font-size: var(--font-size-4xl);
  }
}

/* --- Extra large devices (large desktops, 1200px+) --- */
@media (min-width: 1200px) {
  .container {
    padding: 0 var(--space-xl);
  }

  .calculator-tool {
    padding: var(--space-2xl);
  }
}

/* --- Mobile Navigation --- */
@media (max-width: 991px) {
  /* Hamburger toggle */
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1100;
  }
  .nav-toggle .hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--c-text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.2s ease;
    position: absolute;
  }
  .nav-toggle .hamburger-line:nth-child(1) { transform: translateY(-6px); }
  .nav-toggle .hamburger-line:nth-child(2) { transform: translateY(0); }
  .nav-toggle .hamburger-line:nth-child(3) { transform: translateY(6px); }

  /* Animate to X when open */
  .nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: translateY(0) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: translateY(0) rotate(-45deg); }

  /* Backdrop overlay */
  .nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1050;
    opacity: 0;
    transition: opacity 0.3s ease;
  }
  .nav-backdrop.visible {
    display: block;
    opacity: 1;
  }

  /* Slide-in panel */
  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100dvh;
    background: var(--c-bg-raised);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.18);
    padding: calc(var(--header-h) + var(--sp-6)) var(--sp-6) var(--sp-8);
    z-index: 1060;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }
  .main-nav.open {
    transform: translateX(0);
  }

  /* Nav list */
  .main-nav ul {
    flex-direction: column;
    gap: var(--sp-1);
    list-style: none;
  }

  /* Nav links */
  .main-nav a {
    width: 100%;
    padding: var(--sp-3) var(--sp-4);
    min-height: var(--touch-target);
    font-size: var(--fs-base);
    font-weight: var(--fw-medium);
    color: var(--c-text-2);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.2s, color 0.2s;
  }
  .main-nav a:hover {
    background: var(--c-bg-sunken);
    color: var(--c-text);
  }
  .main-nav a[aria-current="page"] {
    background: var(--c-primary);
    color: #fff;
    font-weight: var(--fw-semibold);
  }

  /* Submenu accordion */
  .has-submenu > a {
    justify-content: space-between;
  }
  .has-submenu > a::after {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.25s ease;
    opacity: 0.5;
    flex-shrink: 0;
  }
  .has-submenu.open > a::after {
    transform: rotate(-135deg);
  }

  .submenu {
    position: static;
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0;
    margin: 0;
    background: none;
    overflow: hidden;
  }
  .has-submenu.open > .submenu {
    grid-template-rows: 1fr;
  }
  .submenu > li {
    overflow: hidden;
    min-height: 0;
  }
  .submenu > li > a {
    padding: var(--sp-2) var(--sp-4) var(--sp-2) var(--sp-8);
    font-size: var(--fs-sm);
    color: var(--c-text-3);
    border-left: 2px solid var(--c-border);
    margin-left: var(--sp-4);
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    min-height: 40px;
    opacity: 0;
    transform: translateX(8px);
    transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s, color 0.2s;
  }
  .has-submenu.open > .submenu > li > a {
    opacity: 1;
    transform: translateX(0);
  }
  .submenu > li > a:hover {
    background: var(--c-bg-sunken);
    color: var(--c-primary);
    border-left-color: var(--c-primary);
  }
  .submenu > li > a[aria-current="page"] {
    background: var(--c-primary);
    color: #fff;
    border-left-color: var(--c-primary);
  }

  /* Stagger submenu item animation */
  .has-submenu.open > .submenu > li:nth-child(1) > a { transition-delay: 0.05s; }
  .has-submenu.open > .submenu > li:nth-child(2) > a { transition-delay: 0.10s; }
  .has-submenu.open > .submenu > li:nth-child(3) > a { transition-delay: 0.15s; }
  .has-submenu.open > .submenu > li:nth-child(4) > a { transition-delay: 0.20s; }
  .has-submenu.open > .submenu > li:nth-child(5) > a { transition-delay: 0.25s; }

  /* Section label in nav */
  .nav-section-label {
    font-size: var(--fs-xs);
    font-weight: var(--fw-bold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--c-text-4);
    padding: var(--sp-4) var(--sp-4) var(--sp-1);
    display: block;
  }

  /* Body scroll lock when menu open */
  body.menu-open {
    overflow: hidden;
  }
}

/* --- Touch-friendly adjustments --- */
@media (hover: none) and (pointer: coarse) {
  .form-input,
  .form-select,
  .btn,
  .toggle-btn,
  .faq-question {
    min-height: var(--touch-target);
  }

  .tooltip-trigger {
    min-width: var(--touch-target);
    min-height: var(--touch-target);
  }
}

/* --- Print specific --- */
@media print {
  @page {
    margin: 1in;
  }

  .calculator-tool {
    break-inside: avoid;
  }

  .results-panel {
    break-inside: avoid;
  }

  .diagram-container {
    break-inside: avoid;
  }

  .diagram-scroll {
    overflow: visible;
  }

  .diagram-scroll svg {
    min-width: 0;
    width: 100%;
  }
}