/* =============================================
   DESIGN TOKENS
   ============================================= */
:root {
  /* Greens */
  --forest:        #1a4731;
  --forest-mid:    #2d6a47;
  --forest-light:  #3a8459;
  --sage:          #5a9e70;
  --moss:          #82bc95;
  --fern:          #b0d9bc;
  --meadow:        #e0f2e7;
  --leaf-mist:     #f2fbf5;

  /* Earthy accents */
  --soil:          #c4792a;
  --soil-mid:      #d99347;
  --soil-light:    #f5e4c8;
  --soil-mist:     #fdf6ec;

  /* Neutrals */
  --cream:         #f9f7f2;
  --white:         #ffffff;
  --ink:           #121f12;
  --body:          #2e4430;
  --muted:         #6b8c70;
  --border:        #cce0d2;
  --border-light:  #e6f2ea;

  /* Shadows */
  --shadow-xs:  0 1px 2px rgba(18,31,18,.06);
  --shadow-sm:  0 1px 4px rgba(18,31,18,.08), 0 1px 2px rgba(18,31,18,.04);
  --shadow:     0 4px 12px rgba(18,31,18,.10), 0 2px 4px rgba(18,31,18,.06);
  --shadow-md:  0 8px 24px rgba(18,31,18,.12), 0 4px 8px rgba(18,31,18,.06);
  --shadow-lg:  0 16px 40px rgba(18,31,18,.14), 0 6px 12px rgba(18,31,18,.07);

  /* Radii */
  --r-xs:  4px;
  --r-sm:  8px;
  --r:     12px;
  --r-lg:  18px;
  --r-xl:  24px;
  --r-2xl: 32px;

  /* Typography */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:    'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Motion */
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --t:            200ms;
  --t-slow:       350ms;
}

/* =============================================
   RESET & BASE
   ============================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--body);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }
[hidden] { display: none !important; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.2;
  font-weight: 700;
}

/* =============================================
   LAYOUT
   ============================================= */
.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: 840px;
}

/* =============================================
   SITE HEADER
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--forest);
  transition: opacity var(--t) var(--ease);
}

.logo:hover { opacity: 0.8; }

.logo-mark {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--forest) 0%, var(--forest-light) 100%);
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.site-nav a {
  padding: 0.4rem 0.875rem;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}

.site-nav a:hover {
  background: var(--meadow);
  color: var(--forest);
}

.site-nav a.active {
  background: var(--meadow);
  color: var(--forest);
  font-weight: 600;
}

.nav-cta {
  margin-left: 0.5rem;
  padding: 0.4rem 1rem !important;
  background: var(--forest) !important;
  color: white !important;
  border-radius: var(--r-sm) !important;
}

.nav-cta:hover {
  background: var(--forest-mid) !important;
  opacity: 0.9;
}

/* =============================================
   BREADCRUMB
   ============================================= */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 1.5rem;
  list-style: none;
  padding: 0;
}

.breadcrumb a { color: rgba(255,255,255,0.8); transition: color var(--t); }
.breadcrumb a:hover { color: white; }

.breadcrumb-sep {
  color: rgba(255,255,255,0.4);
  font-size: 0.75rem;
}

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  background: linear-gradient(140deg, var(--forest) 0%, #1e5a38 40%, #2a7a4a 100%);
  padding: 4rem 0 6rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 75% 40%, rgba(196,121,42,0.15) 0%, transparent 55%),
    radial-gradient(ellipse at 5%  80%, rgba(255,255,255,0.04) 0%, transparent 40%);
  pointer-events: none;
}

/* Subtle organic grid texture */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 100px;
  padding: 0.3rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  margin-bottom: 1.125rem;
  backdrop-filter: blur(8px);
}

.hero h1 {
  font-size: clamp(1.875rem, 4.5vw, 2.875rem);
  color: var(--white);
  margin-bottom: 1rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.82);
  line-height: 1.65;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 100px;
  padding: 0.3125rem 0.75rem;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.88);
  backdrop-filter: blur(6px);
}

/* =============================================
   CALCULATOR SECTION
   ============================================= */
.calc-section {
  padding: 2.5rem 0 4rem;
  margin-top: -2.5rem;
  position: relative;
  z-index: 10;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 288px;
  gap: 1.5rem;
  align-items: start;
}

/* ---- Main Calculator Card ---- */
.calc-card {
  background: var(--white);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.calc-card-head {
  background: linear-gradient(to right, var(--forest), var(--forest-mid));
  padding: 1.375rem 1.75rem;
}

.calc-card-head h2 {
  font-size: 1.3125rem;
  color: white;
  margin-bottom: 0.2rem;
}

.calc-card-head p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.75);
}

.calc-body {
  padding: 1.75rem 1.75rem 2rem;
}

/* Form section spacing */
.form-block {
  margin-bottom: 1.5rem;
}

.form-block:last-of-type {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.625rem;
}

/* ---- Shape Tabs ---- */
.shape-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.shape-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  padding: 0.8125rem 0.5rem;
  border: 2px solid var(--border);
  border-radius: var(--r);
  background: var(--white);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--muted);
  transition:
    border-color var(--t) var(--ease),
    background var(--t) var(--ease),
    color var(--t) var(--ease),
    transform var(--t) var(--ease-spring);
}

.shape-tab:hover {
  border-color: var(--moss);
  color: var(--forest);
  background: var(--leaf-mist);
}

.shape-tab.active {
  border-color: var(--forest);
  background: var(--forest);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,71,49,0.25);
}

.shape-tab svg {
  width: 22px;
  height: 22px;
}

/* ---- Unit Pills ---- */
.unit-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.unit-pill {
  padding: 0.375rem 0.9375rem;
  border: 1.5px solid var(--border);
  border-radius: 100px;
  background: var(--white);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--muted);
  transition:
    border-color var(--t) var(--ease),
    background var(--t) var(--ease),
    color var(--t) var(--ease);
}

.unit-pill:hover {
  border-color: var(--sage);
  color: var(--forest);
}

.unit-pill.active {
  border-color: var(--forest);
  background: var(--forest);
  color: var(--white);
}

/* ---- Dimension Groups ---- */
.dims-group { display: none; }
.dims-group.active { display: block; }

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.input-row:last-child { margin-bottom: 0; }

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.input-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
}

.input-wrap {
  position: relative;
}

.input-wrap input[type="number"] {
  width: 100%;
  padding: 0.6875rem 3rem 0.6875rem 0.875rem;
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--white);
  transition:
    border-color var(--t) var(--ease),
    box-shadow var(--t) var(--ease);
  -moz-appearance: textfield;
  appearance: textfield;
}

.input-wrap input[type="number"]::-webkit-outer-spin-button,
.input-wrap input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  appearance: none;
}

.input-wrap input:focus {
  outline: none;
  border-color: var(--forest);
  box-shadow: 0 0 0 3px rgba(26,71,49,0.08);
}

.input-wrap input.is-error {
  border-color: #dc2626;
  box-shadow: 0 0 0 3px rgba(220,38,38,0.08);
}

.unit-badge {
  position: absolute;
  right: 0.625rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--muted);
  background: var(--border-light);
  padding: 2px 7px;
  border-radius: var(--r-xs);
  pointer-events: none;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---- Optional Section ---- */
.optional-section {
  background: var(--cream);
  border: 1.5px dashed var(--border);
  border-radius: var(--r);
  padding: 1.25rem;
}

.optional-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--body);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.optional-tag {
  font-size: 0.6875rem;
  font-weight: 600;
  background: var(--meadow);
  color: var(--forest);
  padding: 2px 8px;
  border-radius: 100px;
}

.select-wrap {
  position: relative;
}

.select-wrap select {
  width: 100%;
  padding: 0.6875rem 2.5rem 0.6875rem 0.875rem;
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--white);
  cursor: pointer;
  transition: border-color var(--t) var(--ease);
  -webkit-appearance: none;
  appearance: none;
}

.select-wrap select:focus {
  outline: none;
  border-color: var(--forest);
  box-shadow: 0 0 0 3px rgba(26,71,49,0.08);
}

.select-wrap::after {
  content: '';
  position: absolute;
  right: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--muted);
  pointer-events: none;
}

.price-wrap input {
  padding-left: 1.75rem !important;
}

.price-prefix {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted);
  pointer-events: none;
}

#custom-bag-wrap {
  display: none;
  margin-top: 0.75rem;
}

#custom-bag-wrap.visible { display: flex; flex-direction: column; gap: 0.375rem; }

/* ---- Calculate Button ---- */
.calc-btn {
  width: 100%;
  padding: 0.9375rem 1.5rem;
  background: linear-gradient(135deg, var(--forest) 0%, var(--forest-mid) 100%);
  color: white;
  border: none;
  border-radius: var(--r);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition:
    transform var(--t) var(--ease-spring),
    box-shadow var(--t) var(--ease),
    opacity var(--t) var(--ease);
  box-shadow: 0 4px 16px rgba(26,71,49,0.30);
  margin-top: 1.5rem;
}

.calc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26,71,49,0.35);
}

.calc-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(26,71,49,0.25);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15%, 45%, 75% { transform: translateX(-5px); }
  30%, 60%, 90% { transform: translateX(5px); }
}

.calc-btn.is-shaking {
  animation: shake 0.45s var(--ease);
}

/* ---- Calculator Sidebar ---- */
.calc-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-card {
  background: var(--white);
  border-radius: var(--r-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.sidebar-card h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.875rem;
  color: var(--ink);
}

.qr-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.qr-table th {
  text-align: left;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.qr-table td {
  padding: 0.4375rem 0.25rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--body);
}

.qr-table td:last-child {
  font-weight: 600;
  color: var(--forest);
  text-align: right;
}

.qr-table tr:last-child td { border-bottom: none; }

.tip-sidebar {
  background: linear-gradient(135deg, var(--leaf-mist), #eef8f1);
  border: 1px solid var(--fern);
}

.tip-sidebar h3 {
  color: var(--forest);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tip-sidebar p {
  font-size: 0.8125rem;
  color: var(--forest-mid);
  line-height: 1.55;
}

/* =============================================
   RESULTS SECTION
   ============================================= */
.results-wrap {
  margin-top: 2rem;
  animation: resultsFade 0.45s var(--ease) both;
}

@keyframes resultsFade {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.results-card {
  background: var(--white);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.results-head {
  background: linear-gradient(to right, var(--forest), var(--forest-mid));
  padding: 1.375rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.results-head h2 {
  font-size: 1.3125rem;
  color: white;
}

.results-meta {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.72);
}

.results-body {
  padding: 1.75rem;
}

.results-subhead {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  margin-bottom: 0.875rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

/* ---- Volume Grid ---- */
.volume-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.875rem;
  margin-bottom: 2rem;
}

.metric-card {
  background: var(--cream);
  border: 1px solid var(--border-light);
  border-top: 3px solid transparent;
  border-radius: var(--r);
  padding: 1.125rem 0.875rem;
  text-align: center;
  transition: transform var(--t) var(--ease-spring), box-shadow var(--t) var(--ease);
  animation: cardReveal 0.4s var(--ease) both;
}

.metric-card:nth-child(1) { border-top-color: var(--forest);     animation-delay: .05s; }
.metric-card:nth-child(2) { border-top-color: var(--sage);       animation-delay: .10s; }
.metric-card:nth-child(3) { border-top-color: var(--soil);       animation-delay: .15s; }
.metric-card:nth-child(4) { border-top-color: var(--moss);       animation-delay: .20s; }

@keyframes cardReveal {
  from { opacity: 0; transform: translateY(10px) scale(.97); }
  to   { opacity: 1; transform: translateY(0)    scale(1);   }
}

.metric-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.metric-icon {
  font-size: 1.375rem;
  margin-bottom: 0.4rem;
  line-height: 1;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.metric-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---- Bags Grid ---- */
.bags-section { margin-bottom: 2rem; }

.bags-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.bag-card {
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  padding: 1rem 0.75rem;
  text-align: center;
  transition:
    border-color var(--t) var(--ease),
    background var(--t) var(--ease),
    transform var(--t) var(--ease-spring);
  animation: cardReveal 0.4s var(--ease) both;
}

.bag-card:nth-child(1) { animation-delay: .10s; }
.bag-card:nth-child(2) { animation-delay: .15s; }
.bag-card:nth-child(3) { animation-delay: .20s; }
.bag-card:nth-child(4) { animation-delay: .25s; }

.bag-card:hover {
  border-color: var(--forest);
  background: var(--leaf-mist);
  transform: translateY(-2px);
}

.bag-size-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.375rem;
}

.bag-count {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--forest);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.bag-subtitle {
  font-size: 0.625rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---- Cost Section ---- */
.cost-section {
  display: none;
  background: linear-gradient(135deg, var(--soil-mist), #fffaf3);
  border: 1px solid rgba(196,121,42,0.18);
  border-left: 4px solid var(--soil);
  border-radius: var(--r);
  padding: 1.25rem 1.375rem;
  margin-bottom: 1.5rem;
  animation: cardReveal 0.4s var(--ease);
}

.cost-section.visible { display: block; }

.cost-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.625rem 2rem;
  align-items: center;
}

.cost-label {
  font-size: 0.875rem;
  color: var(--body);
}

.cost-value {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--soil);
  text-align: right;
}

.cost-divider {
  grid-column: 1 / -1;
  height: 1px;
  background: rgba(196,121,42,0.15);
  margin: 0.25rem 0;
}

.cost-total .cost-label {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
}

.cost-total .cost-value {
  font-size: 1.75rem;
  color: var(--soil);
}

/* ---- Tip Box ---- */
.tip-box {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  background: var(--meadow);
  border: 1px solid var(--fern);
  border-left: 4px solid var(--forest);
  border-radius: var(--r);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.tip-box-icon { font-size: 1.125rem; flex-shrink: 0; margin-top: 0.1rem; }

.tip-box-text {
  font-size: 0.875rem;
  color: var(--forest);
  line-height: 1.6;
}

.tip-box-text strong { font-weight: 600; }

/* ---- Action Buttons ---- */
.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  padding-top: 0.25rem;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.0625rem;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--body);
  transition:
    border-color var(--t) var(--ease),
    background var(--t) var(--ease),
    color var(--t) var(--ease),
    transform var(--t) var(--ease-spring);
}

.btn-action:hover {
  border-color: var(--forest);
  color: var(--forest);
  background: var(--leaf-mist);
  transform: translateY(-1px);
}

.btn-action.btn-reset {
  color: var(--muted);
}

.btn-action.btn-reset:hover {
  border-color: #dc2626;
  color: #dc2626;
  background: #fef2f2;
}

/* =============================================
   CONTENT SECTION
   ============================================= */
.content-section {
  padding: 4.5rem 0 5rem;
  background: var(--white);
  border-top: 1px solid var(--border-light);
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 256px;
  gap: 4rem;
  align-items: start;
}

/* ---- Article Typography ---- */
.article-content h2 {
  font-size: 1.6875rem;
  margin-top: 3rem;
  margin-bottom: 0.875rem;
  color: var(--ink);
  position: relative;
  padding-left: 1.25rem;
}

.article-content h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.1em;
  height: 1em;
  width: 4px;
  background: linear-gradient(180deg, var(--forest), var(--sage));
  border-radius: 2px;
}

.article-content h2:first-child { margin-top: 0; }

.article-content h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.625rem;
  color: var(--forest-mid);
}

.article-content p {
  margin-bottom: 1.0625rem;
  line-height: 1.75;
  color: var(--body);
}

.article-content ul,
.article-content ol {
  margin: 0.75rem 0 1.25rem 1.375rem;
  line-height: 1.75;
}

.article-content li { margin-bottom: 0.4rem; }
.article-content strong { color: var(--ink); font-weight: 600; }

.article-content a {
  color: var(--forest-mid);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a:hover { color: var(--forest); }

/* Formula Box */
.formula-box {
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-left: 4px solid var(--forest);
  border-radius: var(--r);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.formula-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.formula-text {
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, 'Courier New', monospace;
  font-size: 1rem;
  color: var(--forest);
  font-weight: 500;
}

/* Data Table */
.data-table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--r);
  border: 1px solid var(--border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 480px;
}

.data-table thead th {
  background: var(--forest);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.6875rem 1rem;
  text-align: left;
}

.data-table tbody td {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--body);
}

.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:nth-child(even) td { background: var(--cream); }

/* Info box */
.info-box {
  background: var(--leaf-mist);
  border: 1px solid var(--fern);
  border-radius: var(--r);
  padding: 1.125rem 1.375rem;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
  color: var(--forest-mid);
  line-height: 1.65;
}

/* ---- Article Sidebar ---- */
.article-aside {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.toc-card {
  background: var(--cream);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.25rem;
}

.toc-card-head {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.875rem;
}

.toc-list {
  list-style: none;
  padding: 0;
}

.toc-list li {
  border-bottom: 1px solid var(--border-light);
}

.toc-list li:last-child { border-bottom: none; }

.toc-list a {
  display: block;
  padding: 0.4375rem 0;
  font-size: 0.8125rem;
  color: var(--body);
  transition: color var(--t) var(--ease), padding-left var(--t) var(--ease);
}

.toc-list a:hover {
  color: var(--forest);
  padding-left: 0.375rem;
}

/* =============================================
   FAQ SECTION
   ============================================= */
.faq-section {
  padding: 4.5rem 0;
  background: var(--cream);
  border-top: 1px solid var(--border-light);
}

.section-eyebrow {
  display: inline-block;
  background: var(--meadow);
  color: var(--forest);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  padding: 0.25rem 0.875rem;
  border-radius: 100px;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.625rem, 3.5vw, 2.125rem);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--muted);
  line-height: 1.6;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:first-child { border-top: 1px solid var(--border); }

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 1.25rem 0;
  text-align: left;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: color var(--t) var(--ease);
}

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

.faq-toggle {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  display: grid;
  place-items: center;
  transition:
    background var(--t) var(--ease),
    border-color var(--t) var(--ease),
    transform var(--t) var(--ease-spring);
  color: var(--muted);
}

.faq-item.open .faq-toggle {
  background: var(--forest);
  border-color: var(--forest);
  color: white;
  transform: rotate(45deg);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.38s var(--ease);
}

.faq-item.open .faq-body { max-height: 600px; }

.faq-body-inner {
  padding: 0 0 1.375rem;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--body);
}

.faq-body-inner strong { color: var(--ink); }

/* =============================================
   RELATED CALCULATORS
   ============================================= */
.related-section {
  padding: 4.5rem 0;
  background: var(--white);
  border-top: 1px solid var(--border-light);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.125rem;
  margin-top: 2.5rem;
}

.related-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--white);
  transition:
    border-color var(--t) var(--ease),
    box-shadow var(--t) var(--ease),
    transform var(--t) var(--ease-spring);
  color: inherit;
}

.related-card:hover {
  border-color: var(--forest);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.related-icon {
  width: 46px;
  height: 46px;
  background: var(--meadow);
  border-radius: var(--r);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  flex-shrink: 0;
  transition: background var(--t) var(--ease);
}

.related-card:hover .related-icon {
  background: var(--fern);
}

.related-info h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
  color: var(--ink);
}

.related-info p {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.45;
  margin-bottom: 0.5rem;
}

.coming-badge {
  display: inline-block;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--soil-light);
  color: var(--soil);
  padding: 2px 8px;
  border-radius: 4px;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  background: var(--forest);
  color: rgba(255,255,255,0.65);
  padding: 3.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand .logo {
  color: white;
  margin-bottom: 0.875rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 280px;
}

.footer-col-title {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.875rem;
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li { margin-bottom: 0.5rem; }

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.62);
  transition: color var(--t) var(--ease);
}

.footer-links a:hover { color: white; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8125rem;
}

/* =============================================
   UTILITIES
   ============================================= */
.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;
}

/* =============================================
   PRINT STYLES
   ============================================= */
@media print {
  .site-header,
  .hero,
  .calc-sidebar,
  .article-aside,
  .faq-section,
  .related-section,
  .site-footer,
  .action-row,
  .calc-btn { display: none !important; }

  .results-wrap { animation: none; }
  .results-card,
  .calc-card { box-shadow: none; border: 1px solid #ccc; }
  .metric-card { animation: none; border: 1px solid #ccc; }

  body { background: white; }
}

/* =============================================
   RESPONSIVE — TABLET (≤ 1024px)
   ============================================= */
@media (max-width: 1024px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }

  .calc-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .content-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .article-aside { display: none; }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* =============================================
   RESPONSIVE — MOBILE (≤ 768px)
   ============================================= */
@media (max-width: 768px) {
  .hero { padding: 2.5rem 0 4rem; }
  .hero h1 { font-size: 1.875rem; }

  .calc-section { margin-top: -2rem; padding: 1.5rem 0 3rem; }
  .calc-body { padding: 1.25rem; }

  .volume-grid { grid-template-columns: repeat(2, 1fr); }
  .bags-grid   { grid-template-columns: repeat(2, 1fr); }

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

  .results-body { padding: 1.25rem; }
  .results-head { padding: 1.125rem 1.25rem; }
  .calc-card-head { padding: 1.125rem 1.25rem; }

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

  .site-nav { display: none; }
  .calc-sidebar { display: none; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .section-header { text-align: left; }
  .section-eyebrow { display: none; }
}

/* =============================================
   RESPONSIVE — SMALL MOBILE (≤ 480px)
   ============================================= */
@media (max-width: 480px) {
  .shape-tabs { gap: 0.375rem; }
  .shape-tab { padding: 0.625rem 0.25rem; font-size: 0.75rem; }
  .shape-tab svg { width: 18px; height: 18px; }

  .volume-grid { grid-template-columns: repeat(2, 1fr); gap: 0.625rem; }
  .bags-grid   { grid-template-columns: repeat(2, 1fr); gap: 0.625rem; }

  .action-row { flex-direction: column; }
  .btn-action { width: 100%; justify-content: center; }

  .hero-badges { flex-direction: column; align-items: flex-start; }
}