/* ================================================================
   Material Calculators — Design System
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@400;600;700;800;900&display=swap');

/* ── Tokens ──────────────────────────────────────────────────── */
:root {
  /* Brand */
  --green-900: #0d2b1a;
  --green-800: #133d26;
  --green-700: #1a5233;
  --green-600: #1e6b3e;
  --green-500: #2a8a50;
  --green-400: #3aad68;
  --green-300: #5dc886;
  --green-200: #a8e8c0;
  --green-100: #d4f4e2;

  --slate-900: #0f1923;
  --slate-800: #182130;
  --slate-750: #1e2a3a;
  --slate-700: #243245;
  --slate-600: #3a4d63;
  --slate-500: #536678;
  --slate-400: #7a8fa5;
  --slate-300: #a8b8c8;
  --slate-200: #d0dae4;
  --slate-100: #eef2f6;
  --slate-50: #f8fafc;

  --amber-500: #f59e0b;
  --amber-400: #fbbf24;
  --amber-100: #fef3c7;

  --red-500: #ef4444;
  --red-100: #fee2e2;

  --white: #ffffff;

  /* Semantic */
  --bg-page:          var(--slate-900);
  --bg-surface:       var(--slate-800);
  --bg-surface-2:     var(--slate-750);
  --bg-card:          var(--slate-700);
  --border-subtle:    rgba(255,255,255,0.06);
  --border-medium:    rgba(255,255,255,0.12);
  --text-primary:     #f0f4f8;
  --text-secondary:   var(--slate-300);
  --text-muted:       var(--slate-400);
  --accent-primary:   var(--green-500);
  --accent-hover:     var(--green-400);
  --accent-glow:      rgba(42,138,80,0.25);

  /* Typography */
  --font-display: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Radii */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  18px;
  --radius-xl:  24px;
  --radius-pill:9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.4), 0 2px 6px rgba(0,0,0,0.3);
  --shadow-lg:  0 10px 40px rgba(0,0,0,0.5), 0 4px 12px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 0 3px var(--accent-glow), 0 4px 16px rgba(0,0,0,0.4);
  --shadow-green: 0 4px 24px rgba(42,138,80,0.35);

  /* Transitions */
  --t-fast: 150ms ease;
  --t-base: 250ms ease;
  --t-slow: 400ms ease;
}

/* ── Light Theme (high-contrast, outdoor-legible) ────────────── */
[data-theme="light"] {
  --bg-page:        #f0f4f0;
  --bg-surface:     #ffffff;
  --bg-surface-2:   #f2f5f2;
  --bg-card:        #e8ede8;
  --border-subtle:  rgba(0,0,0,0.08);
  --border-medium:  rgba(0,0,0,0.16);
  --text-primary:   #0d180f;
  --text-secondary: #2a3d2e;
  --text-muted:     #4a6050;
  --accent-primary: var(--green-600);
  --accent-hover:   var(--green-700);
  --accent-glow:    rgba(30,107,62,0.2);

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.12), 0 2px 6px rgba(0,0,0,0.08);
  --shadow-lg:  0 10px 40px rgba(0,0,0,0.16), 0 4px 12px rgba(0,0,0,0.10);
  --shadow-glow: 0 0 0 3px rgba(30,107,62,0.2), 0 2px 8px rgba(0,0,0,0.1);
  --shadow-green: 0 4px 20px rgba(30,107,62,0.3);
}

/* Light theme element overrides */
[data-theme="light"] body {
  background-color: var(--bg-page);
  color: var(--text-primary);
}

[data-theme="light"] .site-header {
  background: rgba(240,244,240,0.92);
  border-bottom-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .site-nav a {
  color: var(--text-secondary);
}

[data-theme="light"] .site-nav a:hover {
  background: rgba(0,0,0,0.06);
  color: var(--text-primary);
}

[data-theme="light"] .site-nav a.active {
  color: var(--green-700);
}

[data-theme="light"] .page-hero {
  background: linear-gradient(135deg, #c8e8d4 0%, #e8f5ed 55%, #f0f4f0 100%);
}

[data-theme="light"] .page-hero::before {
  background:
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(30,107,62,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(30,107,62,0.06) 0%, transparent 60%);
}

[data-theme="light"] .page-hero__title {
  color: #0a1a0e;
}

[data-theme="light"] .page-hero__title .highlight {
  background: linear-gradient(135deg, var(--green-700), var(--green-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="light"] .page-hero__badge {
  background: rgba(30,107,62,0.12);
  border-color: rgba(30,107,62,0.3);
  color: var(--green-700);
}

[data-theme="light"] .page-hero__desc {
  color: #334d39;
}

[data-theme="light"] .page-hero__meta-item {
  color: #334d39;
}

[data-theme="light"] .page-hero__meta-item svg {
  color: var(--green-700);
}

[data-theme="light"] .btn--secondary {
  background: rgba(0,0,0,0.06);
  border-color: rgba(0,0,0,0.18);
  color: var(--text-primary);
}

[data-theme="light"] .btn--secondary:hover {
  background: rgba(0,0,0,0.10);
  color: var(--text-primary);
}

[data-theme="light"] .btn--ghost {
  color: var(--green-700);
  border-color: rgba(30,107,62,0.4);
}

[data-theme="light"] .btn--ghost:hover {
  background: rgba(30,107,62,0.08);
  color: var(--green-800);
}

[data-theme="light"] .form-input,
[data-theme="light"] .form-select {
  background-color: #ffffff;
  border-color: rgba(0,0,0,0.18);
  color: var(--text-primary);
}

[data-theme="light"] .form-input::placeholder {
  color: #7a9080;
}

[data-theme="light"] .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%234a6050' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

[data-theme="light"] .form-select option {
  background: #ffffff;
  color: var(--text-primary);
}

[data-theme="light"] .seg-control {
  background: #e8ede8;
  border-color: rgba(0,0,0,0.14);
}

[data-theme="light"] .seg-control__btn {
  color: #4a6050;
}

[data-theme="light"] .seg-control__btn.active {
  background: var(--green-700);
  color: #ffffff;
}

[data-theme="light"] .results-panel {
  background: linear-gradient(135deg, #c8e8d4, #dff2e7);
  border-color: rgba(30,107,62,0.35);
}

[data-theme="light"] .results-panel::before {
  background: radial-gradient(circle, rgba(30,107,62,0.15) 0%, transparent 70%);
}

[data-theme="light"] .results-panel__label {
  color: var(--green-800);
}

[data-theme="light"] .results-panel__value {
  color: #0a1a0e;
}

[data-theme="light"] .results-panel__unit {
  color: var(--green-700);
}

[data-theme="light"] .stat-card {
  background: rgba(0,0,0,0.04);
  border-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .stat-card__label {
  color: #4a6050;
}

[data-theme="light"] .stat-card__value {
  color: #0d180f;
}

[data-theme="light"] .stat-card__sub {
  color: #4a6050;
}

[data-theme="light"] .callout--info {
  background: rgba(30,107,62,0.08);
  border-color: rgba(30,107,62,0.25);
  color: #1a5233;
}

[data-theme="light"] .callout--warn {
  background: rgba(180,100,0,0.08);
  border-color: rgba(180,100,0,0.25);
  color: #7a4000;
}

[data-theme="light"] .callout--note {
  background: rgba(0,0,0,0.04);
  border-color: rgba(0,0,0,0.12);
  color: var(--text-secondary);
}

[data-theme="light"] .section-eyebrow {
  color: var(--green-700);
}

[data-theme="light"] .section-title {
  color: var(--text-primary);
}

[data-theme="light"] .section-desc {
  color: var(--text-secondary);
}

[data-theme="light"] .calc-panel {
  background: #ffffff;
  border-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .calc-divider {
  background: rgba(0,0,0,0.08);
}

[data-theme="light"] .faq-item {
  background: #ffffff;
  border-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .faq-question {
  color: var(--text-primary);
}

[data-theme="light"] .faq-question:hover {
  color: var(--green-700);
}

[data-theme="light"] .faq-answer {
  color: var(--text-secondary);
  border-top-color: rgba(0,0,0,0.08);
}

[data-theme="light"] .site-footer {
  background: #e4ebe4;
  border-top-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .footer-about__logo span {
  color: var(--text-primary);
}

[data-theme="light"] .footer-about__desc {
  color: var(--text-muted);
}

[data-theme="light"] .footer-col__title {
  color: #4a6050;
}

[data-theme="light"] .footer-col__links a {
  color: var(--text-secondary);
}

[data-theme="light"] .footer-col__links a:hover {
  color: var(--green-700);
}

[data-theme="light"] .site-footer__bottom {
  border-top-color: rgba(0,0,0,0.10);
}

[data-theme="light"] .site-footer__copy {
  color: #4a6050;
}

[data-theme="light"] .site-footer__disclaimer {
  color: #6a8070;
}

[data-theme="light"] .share-btn {
  background: rgba(0,0,0,0.06);
  border-color: rgba(0,0,0,0.16);
  color: var(--text-secondary);
}

[data-theme="light"] .share-btn:hover {
  background: rgba(0,0,0,0.10);
  color: var(--text-primary);
}

[data-theme="light"] .card {
  background: #ffffff;
  border-color: rgba(0,0,0,0.10);
}

[data-theme="light"] a {
  color: var(--green-700);
}

[data-theme="light"] a:hover {
  color: var(--green-800);
}

/* ── Theme Toggle Button ─────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px 6px 10px;
  cursor: pointer;
  transition: all var(--t-base);
  white-space: nowrap;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--green-500);
  color: var(--text-primary);
}

.theme-toggle__icon {
  width: 18px;
  height: 18px;
  transition: transform var(--t-slow);
  flex-shrink: 0;
}

[data-theme="light"] .theme-toggle {
  background: rgba(0,0,0,0.06);
  border-color: rgba(0,0,0,0.18);
  color: var(--text-secondary);
}

[data-theme="light"] .theme-toggle:hover {
  border-color: var(--green-700);
  color: var(--text-primary);
}

/* Sun icon shown in dark mode, moon shown in light mode */
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Touch / tap behaviour ───────────────────────────────────── */
/* Prevents elements from briefly highlighting when a finger scrolls
   over them without intending to tap. touch-action: manipulation
   also removes the 300ms tap delay on iOS/Android. */
button,
a,
[role="button"],
[role="tab"],
input,
select,
textarea,
label {
  -webkit-tap-highlight-color: transparent;
}

button,
a,
[role="button"],
[role="tab"] {
  touch-action: manipulation;
}

/* ── Suppress scroll-triggered hover on touch devices ────────── */
/* On touch screens :hover fires as soon as a finger touches an element,
   even during a scroll gesture — before the browser knows if the user
   intends to tap or scroll. This causes option buttons to flash green
   as a finger scrolls past them.
   @media (hover: none) targets devices without true hover capability
   (phones, tablets). The .active class set by JS is unaffected. */
@media (hover: none) {

  /* All custom option/selector buttons — classes containing "-btn"
     (e.g. .ctype-btn, .method-btn, .surf-btn, .mat-btn, .shed-btn …)
     Does NOT match .btn--primary / .btn--secondary (those start with btn--) */
  [class*="-btn"]:not(.active):hover {
    background:    var(--bg-card)        !important;
    border-color:  var(--border-subtle)  !important;
    color:         var(--text-secondary) !important;
    transform:     none                  !important;
    box-shadow:    none                  !important;
    opacity:       1                     !important;
  }

  /* Sub-text spans / last-child divs inside option buttons */
  [class*="-btn"]:not(.active):hover span,
  [class*="-btn"]:not(.active):hover > div:last-child {
    color:   var(--text-muted) !important;
    opacity: 0.8               !important;
  }

  /* .btn action buttons (Calculate, Reset, Save PDF, etc.)
     Remove the lift/shadow on scroll-hover */
  .btn:hover {
    transform:  none !important;
    box-shadow: var(--shadow-green) !important; /* keep base shadow, remove hover-lift */
  }

  /* Navigation and misc interactive elements */
  .faq-question:hover     { color: inherit !important; }
  .footer-col__links a:hover { color: var(--text-secondary) !important; }
  .card--interactive:hover {
    transform:  none !important;
    box-shadow: none !important;
  }
}


html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--green-400); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--green-300); }

/* ── Layout ──────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 860px;
}

/* ── Site Header ─────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,25,35,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: contain;
}

.site-logo__text {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.site-logo__text span {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--green-400);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}

.site-nav a:hover {
  color: var(--text-primary);
  background: var(--border-subtle);
}

.site-nav a.active {
  color: var(--green-400);
}

.site-header__cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Hamburger (mobile) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
}

/* ── Trust Bar ───────────────────────────────────────────────── */
.trust-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 9px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.trust-bar::-webkit-scrollbar { display: none; }

.trust-bar__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  min-width: max-content;
  padding: 0 4px;
}

.trust-bar__item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  padding: 0 20px;
}

.trust-bar__item svg {
  color: var(--green-500);
  flex-shrink: 0;
}

[data-theme="light"] .trust-bar__item svg {
  color: var(--green-700);
}

.trust-bar__divider {
  width: 1px;
  height: 14px;
  background: var(--border-medium);
  flex-shrink: 0;
}

[data-theme="light"] .trust-bar {
  background: #f8faf8;
  border-bottom-color: rgba(0,0,0,0.08);
}

@media (max-width: 600px) {
  .trust-bar__inner {
    justify-content: flex-start;
  }
  .trust-bar__divider { display: none; }
  .trust-bar__item { padding: 0 14px 0 0; font-size: 0.775rem; }
  .trust-bar__item:first-child { padding-left: 0; }
}

/* ── Graded Dig Dims Section ─────────────────────────────────── */
.graded-dims {
  margin-top: 16px;
  border-left: 3px solid rgba(42,138,80,0.4);
  padding-left: 14px;
}

.graded-dims__hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 12px;
}

.graded-dims__hint strong {
  color: var(--green-400);
}

[data-theme="light"] .graded-dims__hint strong {
  color: var(--green-700);
}

.graded-dims__auto-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(42,138,80,0.12);
  border: 1px solid rgba(42,138,80,0.25);
  color: var(--green-400);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  margin-left: 6px;
  vertical-align: middle;
}

[data-theme="light"] .graded-dims__auto-badge {
  color: var(--green-700);
  background: rgba(30,107,62,0.1);
  border-color: rgba(30,107,62,0.25);
}

/* ── Hero / Page Header ──────────────────────────────────────── */
.page-hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 56px;
  background: linear-gradient(135deg, var(--green-900) 0%, var(--slate-800) 60%, var(--slate-900) 100%);
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(42,138,80,0.15) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(42,138,80,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.page-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(42,138,80,0.15);
  border: 1px solid rgba(42,138,80,0.3);
  color: var(--green-300);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--white);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.page-hero__title .highlight {
  background: linear-gradient(135deg, var(--green-400), var(--green-300));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-hero__desc {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--slate-300);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.page-hero__meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--slate-300);
}

.page-hero__meta-item svg {
  color: var(--green-400);
  flex-shrink: 0;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--t-base);
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--green-500), var(--green-600));
  color: var(--white);
  box-shadow: var(--shadow-green);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--green-400), var(--green-500));
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(42,138,80,0.45);
  color: var(--white);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--secondary {
  background: var(--border-subtle);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
}

.btn--secondary:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--green-400);
  border: 1px solid rgba(42,138,80,0.4);
}

.btn--ghost:hover {
  background: rgba(42,138,80,0.1);
  color: var(--green-300);
}

.btn--lg {
  font-size: 1.0625rem;
  padding: 15px 32px;
  border-radius: var(--radius-lg);
}

.btn--sm {
  font-size: 0.8125rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
}

.btn--full { width: 100%; }

/* ── Cards ───────────────────────────────────────────────────── */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card--elevated {
  box-shadow: var(--shadow-md);
}

.card--interactive {
  cursor: pointer;
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
}

.card--interactive:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(42,138,80,0.3);
}

/* ── Forms ───────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.form-label .label-sub {
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

.form-input,
.form-select {
  width: 100%;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  padding: 11px 14px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--green-500);
  box-shadow: var(--shadow-glow);
}

.form-input::placeholder {
  color: var(--slate-500);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%237a8fa5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-select option {
  background: var(--slate-800);
  color: var(--text-primary);
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-unit .form-input {
  padding-right: 56px;
}

.input-unit {
  position: absolute;
  right: 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
  user-select: none;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.form-error {
  font-size: 0.8rem;
  color: var(--red-500);
  display: none;
}

.form-group.has-error .form-input,
.form-group.has-error .form-select {
  border-color: var(--red-500);
}

.form-group.has-error .form-error {
  display: block;
}

/* ── Segmented Control ───────────────────────────────────────── */
.seg-control {
  display: flex;
  flex-wrap: wrap;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 3px;
}

.seg-control__btn {
  flex: 1;
  min-width: max-content;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 3px);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 8px 16px;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
}

.seg-control__btn.active {
  background: var(--green-600);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

/* ── Results / Output ────────────────────────────────────────── */
.results-panel {
  background: linear-gradient(135deg, var(--green-900), var(--slate-750));
  border: 1px solid rgba(42,138,80,0.25);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  overflow: hidden;
}

.results-panel::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(42,138,80,0.2) 0%, transparent 70%);
  pointer-events: none;
}

.results-panel__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green-400);
  margin-bottom: 6px;
}

.results-panel__value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.1;
}

.results-panel__unit {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--green-300);
}

/* ── Result sub-note (cubic yards line) ──────────────────────── */
.result-sub-note {
  font-size: 0.85rem;
  color: var(--green-200);
  margin-top: 4px;
}

[data-theme="light"] .result-sub-note {
  color: #1a5233; /* deep green — strong contrast on light green panel */
}

/* ── Big count numbers (lorry / skip) ────────────────────────── */
.result-big-count {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
}

.result-big-count--primary  { color: var(--green-400); }
.result-big-count--secondary { color: var(--slate-300); }

[data-theme="light"] .result-big-count--primary  { color: #1a5233; } /* deep green on white */
[data-theme="light"] .result-big-count--secondary { color: #2a3d4a; } /* dark slate — accessible on white */

.result-big-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding-bottom: 6px;
}

/* ── Cost value colours ───────────────────────────────────────── */
.cost-value { font-size: 1.1rem; }

.cost-value--low  { color: var(--green-400); }
.cost-value--mid  { color: var(--amber-400); }
.cost-value--high { color: #f87171; }

/* Light mode: amber (#fbbf24) fails on white — use darker equivalents */
[data-theme="light"] .cost-value--low  { color: #1a6b3a; } /* dark green */
[data-theme="light"] .cost-value--mid  { color: #92400e; } /* dark amber/brown — accessible */
[data-theme="light"] .cost-value--high { color: #b91c1c; } /* dark red */

/* ── EWC Classification type label light mode ─────────────────── */
/* Note: colour is set inline via JS; override with high-specificity attr selector */
[data-theme="light"] #result-ewc-type[data-ewc-class="ok"]   { color: #1a6b3a !important; }
[data-theme="light"] #result-ewc-type[data-ewc-class="warn"] { color: #92400e !important; }
/* EWC code text on light backgrounds */
[data-theme="light"] #result-ewc-code { color: #1e3a8a !important; } /* dark navy blue */

/* ── Stat Grid ───────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.stat-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.stat-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.stat-card__value {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-card__sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Info Callout ────────────────────────────────────────────── */
.callout {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.6;
}

.callout--info {
  background: rgba(42,138,80,0.1);
  border: 1px solid rgba(42,138,80,0.25);
  color: var(--green-200);
}

.callout--warn {
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.25);
  color: var(--amber-100);
}

.callout--note {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
}

.callout__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 1px;
}

/* ── Section ─────────────────────────────────────────────────── */
.section {
  padding: 64px 0;
}

.section--sm {
  padding: 40px 0;
}

.section-header {
  margin-bottom: 40px;
}

.section-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green-400);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.7;
}

/* ── Calculator Layout ───────────────────────────────────────── */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 800px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

.calc-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-md);
}

.calc-panel__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.calc-panel__subtitle {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.calc-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 20px 0;
}

.fields-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.fields-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

/* ── Mobile-first: stack fields earlier for thumb-friendliness ── */
@media (max-width: 600px) {
  .fields-grid,
  .fields-grid--3 {
    grid-template-columns: 1fr;
  }

  /* Larger tap targets on mobile */
  .form-input,
  .form-select {
    font-size: 1rem;
    padding: 13px 14px;
    min-height: 48px;
  }

  .input-with-unit .form-input {
    padding-right: 60px;
  }

  .input-unit {
    font-size: 0.875rem;
  }

  /* Bigger calculate button for thumb use */
  #calculate-btn {
    font-size: 1.05rem;
    padding: 16px 24px;
    min-height: 52px;
  }

  #reset-btn {
    min-height: 52px;
    min-width: 52px;
  }

  /* Seg control buttons — compact on mobile, still easy to tap */
  .seg-control__btn {
    padding: 8px 10px;
    font-size: 0.8rem;
    min-height: 40px;
  }
}

/* ── Skip / Vehicle Cards ────────────────────────────────────── */
.vehicle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.vehicle-card {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.vehicle-card__icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.vehicle-card__name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.vehicle-card__count {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--green-400);
  line-height: 1;
  margin-bottom: 4px;
}

.vehicle-card__sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── FAQ / Accordion ─────────────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color var(--t-fast);
}

.faq-question:hover { color: var(--green-300); }

.faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  transition: transform var(--t-base);
  color: var(--text-muted);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  color: var(--green-400);
}

.faq-answer {
  display: none;
  padding: 20px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border-subtle);
}

.faq-item.open .faq-answer { display: block; }

/* ── Site Footer ─────────────────────────────────────────────── */
.site-footer {
  background: var(--slate-900);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 24px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-about__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-about__logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.footer-about__logo span {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-about__desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col__title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.footer-col__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col__links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--t-fast);
}

.footer-col__links a:hover { color: var(--green-400); }

.site-footer__bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer__copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.site-footer__disclaimer {
  font-size: 0.75rem;
  color: var(--slate-500);
  max-width: 700px;
  text-align: right;
  line-height: 1.5;
}

/* ── Share Button ────────────────────────────────────────────── */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--t-fast);
}

.share-btn:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}

/* ── Utilities ───────────────────────────────────────────────── */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.text-center { text-align: center; }
.text-green { color: var(--green-400); }
.text-muted { color: var(--text-muted); }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

/* ── Animations ──────────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 0 0 rgba(42,138,80,0.4); }
  50%       { box-shadow: 0 0 0 8px rgba(42,138,80,0); }
}

.animate-in {
  animation: fadeInUp 0.5s ease both;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-nav { display: none !important; }
  .nav-toggle { display: flex; }
  
  .site-header .site-nav.open {
    display: flex !important;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    height: calc(100vh - 68px);
    background: var(--bg-page);
    padding: 24px;
    z-index: 9999;
    border-top: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
  }
  
  [data-theme="light"] .site-nav.open {
    background: #ffffff;
    border-top: 1px solid rgba(0,0,0,0.08);
  }
  .theme-toggle__label { display: none; }
  .theme-toggle { padding: 7px 10px; gap: 0; }
  .site-nav.open a {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    padding: 18px;
    text-align: center;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
  }
  .site-nav.open a.active {
    color: var(--green-400);
    background: rgba(42,138,80,0.06);
  }
  .site-footer__grid {
    grid-template-columns: 1fr;
  }
  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
  }
  .site-footer__disclaimer { text-align: center; max-width: 100%; }
  .calc-panel { padding: 20px; }
  .page-hero { padding: 48px 0 40px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .sticky-actions__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .sticky-actions__meta {
    justify-content: center;
  }
  .sticky-actions__btns {
    justify-content: center;
    flex-wrap: wrap;
  }
  .sticky-actions__btns .btn {
    flex: 1;
    min-width: 120px;
  }
}

@media (max-width: 600px) {
  .guide-cost-grid { grid-template-columns: 1fr !important; }
  .hide-mobile { display: none; }
}

/* ── Sticky Actions Bar ──────────────────────────────────────── */
.sticky-actions {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 12px 0;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
  backdrop-filter: blur(10px);
}

.sticky-actions.visible {
  transform: translateY(0);
}

.sticky-actions.at-footer {
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

.sticky-actions__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.sticky-actions__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.sticky-actions__btns {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sticky-actions__expandable {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  background: var(--bg-surface);
}

.sticky-actions.is-expanded .sticky-actions__expandable {
  max-height: 600px;
  border-bottom: 1px solid var(--border-subtle);
}

.sticky-drawer-card {
  padding: 20px 0;
}

[data-theme="light"] .sticky-actions {
  background: rgba(255, 255, 255, 0.95);
}

@media (max-width: 600px) {
  .hide-mobile { display: none; }
}

@media (max-width: 768px) {
  .sticky-actions__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .sticky-actions__meta {
    justify-content: center;
  }
  .sticky-actions__btns {
    justify-content: center;
    flex-wrap: wrap;
  }
  .sticky-actions__btns .btn {
    flex: 1;
    min-width: 120px;
  }
}

/* ── Screen: hide the print-only template ──────────────────── */
.print-only {
  display: none !important;
}

/* ── Print Styles (for PDF) ─────────────────────────────────── */
@media print {
  /* Hide entire site UI */
  body > *:not(#print-report) {
    display: none !important;
  }

  /* Show the template */
  #print-report {
    display: block !important;
    padding: 40px;
    width: 100%;
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 12pt;
    color: #1e293b;
  }

  /* Ensure print colours render */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  @page {
    margin: 1.5cm;
    size: A4;
  }
}