/* ============================================================
   PREP FOOD STORAGE CALCULATOR — styles.css
   Aesthetic: Industrial/Utilitarian — earth tones, stencil type
   ============================================================ */

/* ── CSS Variables ──────────────────────────────────────────── */
:root {
  /* Colors — Light Mode */
  --bg:           #f4f1e8;
  --bg-card:      #ede9db;
  --bg-deep:      #e4dfc9;
  --border:       #c5bda3;
  --border-strong:#9a9178;
  --text:         #1e1c15;
  --text-muted:   #5a5640;
  --text-faint:   #8a8470;
  --accent:       #5c6b2e;      /* olive green */
  --accent-light: #7a8e3d;
  --accent-glow:  rgba(92,107,46,0.15);
  --danger:       #8b2e2e;
  --water:        #2e5c8b;
  --water-light:  #3d7ab8;
  --highlight:    #c8a227;      /* amber */
  --highlight-bg: rgba(200,162,39,0.12);
  --white:        #ffffff;
  --shadow:       0 2px 8px rgba(0,0,0,0.10);
  --shadow-md:    0 4px 20px rgba(0,0,0,0.14);

  /* Typography */
  --font-mono:    'Share Tech Mono', 'Courier New', monospace;
  --font-heading: 'Oswald', 'Impact', sans-serif;
  --font-body:    'Source Serif 4', Georgia, serif;

  /* Spacing */
  --gap:          1.25rem;
  --radius:       4px;
  --radius-lg:    8px;

  /* Layout */
  --sidebar-w:    280px;
  --max-w:        1200px;
}

/* Dark Mode */
body.dark {
  --bg:           #141410;
  --bg-card:      #1e1d16;
  --bg-deep:      #252318;
  --border:       #3a3828;
  --border-strong:#5a5740;
  --text:         #e8e4d4;
  --text-muted:   #a8a48a;
  --text-faint:   #6a6650;
  --accent:       #8aac3a;
  --accent-light: #a8cc50;
  --accent-glow:  rgba(138,172,58,0.15);
  --danger:       #cc5555;
  --water:        #4a8ccc;
  --water-light:  #6aaae0;
  --highlight:    #d4a830;
  --highlight-bg: rgba(212,168,48,0.12);
  --shadow:       0 2px 8px rgba(0,0,0,0.35);
  --shadow-md:    0 4px 20px rgba(0,0,0,0.45);
}

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

/* Ensure [hidden] always wins over display overrides */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.65;
  transition: background 0.3s, color 0.3s;
  /* Subtle texture overlay */
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 39px,
      rgba(0,0,0,0.03) 39px,
      rgba(0,0,0,0.03) 40px
    );
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1rem;
}

.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;
}

/* ── Header ─────────────────────────────────────────────────── */
.site-header {
  background: var(--bg-deep);
  border-bottom: 3px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
  filter: drop-shadow(0 0 6px var(--accent-glow));
}

.brand-title {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent);
  line-height: 1.1;
}

.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dark-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}

.dark-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toggle-icon { font-size: 1rem; }

/* ── Ad Slots ───────────────────────────────────────────────── */
.ad-slot { width: 100%; }

.ad-placeholder {
  background: var(--bg-deep);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  min-height: 90px;
  text-transform: uppercase;
}

.ad-placeholder--inline { min-height: 60px; }

.ad-header { padding: 0.5rem 1rem; }
.ad-header .ad-placeholder { max-width: 728px; margin: 0 auto; min-height: 70px; }

.ad-results { margin: 2rem 0; }
.ad-sidebar .ad-placeholder { min-height: 250px; }
.ad-footer { margin-top: 1.5rem; }

/* ── Layout Wrapper ─────────────────────────────────────────── */
.layout-wrapper {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-w);
  gap: 2rem;
  align-items: start;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

@media (max-width: 900px) {
  .layout-wrapper {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
  }
}

/* ── Intro Block ─────────────────────────────────────────────── */
.intro-block {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.intro-block h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.intro-text {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 1rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 2px;
  background: var(--accent-glow);
}

/* ── Section Labels ──────────────────────────────────────────── */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.block-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

/* ── Calculator Form ─────────────────────────────────────────── */
.calc-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

.form-fieldset {
  border: none;
  padding: 0;
  margin-bottom: 1.75rem;
}

.fieldset-legend {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.legend-note {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-faint);
  font-family: var(--font-mono);
  text-transform: none;
  letter-spacing: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--gap);
}

.form-grid--narrow {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  max-width: 400px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group--checkbox {
  flex-direction: row;
  align-items: center;
  gap: 0.6rem;
}

.form-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.form-label--inline {
  font-size: 0.85rem;
  cursor: pointer;
}

.label-icon { font-size: 1rem; }

.form-input,
.form-select {
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 0.55rem 0.75rem;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
  -webkit-appearance: none;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23777'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input:invalid { border-color: var(--danger); }

.form-checkbox {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.form-hint {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

.duration-preview {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  min-height: 1.2em;
}

.gender-note {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--highlight);
  min-height: 1em;
}

/* ── Form Actions ────────────────────────────────────────────── */
.form-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 0.5rem;
}

.btn-calculate {
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 0.8rem 2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 3px 0 rgba(0,0,0,0.25);
  text-transform: uppercase;
}

.btn-calculate:hover {
  background: var(--accent-light);
  box-shadow: 0 4px 0 rgba(0,0,0,0.25);
  transform: translateY(-1px);
}

.btn-calculate:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 rgba(0,0,0,0.2);
}

.btn-icon { font-size: 0.9rem; }

.btn-reset {
  background: transparent;
  color: var(--text-faint);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.2s;
}

.btn-reset:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.form-error {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(139,46,46,0.12);
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  color: var(--danger);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

/* ── Loading Overlay ─────────────────────────────────────────── */
.loading-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text { animation: pulse 1s ease-in-out infinite alternate; }

@keyframes pulse {
  from { opacity: 0.5; }
  to   { opacity: 1; }
}

/* ── Results Section ─────────────────────────────────────────── */
.results-section {
  animation: fadeUp 0.4s ease both;
}

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

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.results-actions {
  display: flex;
  gap: 0.6rem;
}

.btn-copy, .btn-print {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  text-transform: uppercase;
  transition: all 0.2s;
}

.btn-copy:hover { border-color: var(--accent); color: var(--accent); }
.btn-print:hover { border-color: var(--water); color: var(--water); }

/* ── Summary Grid ────────────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.15s, box-shadow 0.15s;
}

.summary-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: var(--card-accent, var(--accent));
}

.summary-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  display: block;
}

.card-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.card-value {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 0.2rem;
}

.card-unit {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.card-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  font-style: italic;
}

/* ── Breakdown Grid ──────────────────────────────────────────── */
.breakdown-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.breakdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.breakdown-item {
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.breakdown-item-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.breakdown-icon { font-size: 1.2rem; }

.breakdown-name {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text);
  text-transform: uppercase;
}

.breakdown-amount {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: bold;
  margin-bottom: 0.2rem;
}

.breakdown-detail {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Progress bar */
.breakdown-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 0.6rem;
  overflow: hidden;
}

.breakdown-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.6s cubic-bezier(.22,.61,.36,1);
}

/* ── Water Block ─────────────────────────────────────────────── */
.water-block {
  background: rgba(46,92,139,0.08);
  border: 1px solid var(--water);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.water-block .block-title { color: var(--water-light); }

.water-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.water-stat {
  text-align: center;
}

.water-stat-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--water-light);
  display: block;
}

.water-stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── Tips Block ──────────────────────────────────────────────── */
.tips-block {
  background: var(--highlight-bg);
  border: 1px solid var(--highlight);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.tips-block .block-title { color: var(--highlight); }

.tips-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.5rem;
}

.tips-list li {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-left: 1.4rem;
  position: relative;
}

.tips-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--highlight);
  font-size: 0.8rem;
}

/* ── Recalc ──────────────────────────────────────────────────── */
.recalc-row {
  text-align: center;
  margin-top: 1rem;
}

.btn-recalc {
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding: 0.65rem 1.5rem;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.2s;
}

.btn-recalc:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ── Toast ───────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--accent);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  z-index: 999;
  animation: toastIn 0.3s ease both;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Sidebar ─────────────────────────────────────────────────── */
.sidebar { display: flex; flex-direction: column; gap: 1.25rem; }

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

.sidebar-card-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Reference Table */
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.ref-table th {
  text-align: left;
  color: var(--text-faint);
  letter-spacing: 0.06em;
  padding: 0.3rem 0.4rem;
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  font-size: 0.68rem;
}

.ref-table td {
  padding: 0.4rem 0.4rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.ref-table td:first-child { color: var(--text); }

.ref-note {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  margin-top: 0.6rem;
  letter-spacing: 0.04em;
}

/* Shelf List */
.shelf-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.shelf-list li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.shelf-list li strong {
  color: var(--text);
  font-weight: 600;
}

/* ── Footer ──────────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem;
  margin-top: 2rem;
}

.footer-inner { text-align: center; }

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

.footer-disclaimer {
  font-size: 0.75rem;
  color: var(--text-faint);
  margin-top: 0.35rem;
  font-style: italic;
}

/* ── Print Styles ────────────────────────────────────────────── */
@media print {
  .site-header,
  .sidebar,
  .form-actions,
  .results-actions,
  .recalc-row,
  .ad-slot,
  .dark-toggle,
  .toast,
  .intro-block .badge-row {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
    font-size: 11pt;
    background-image: none !important;
  }

  .layout-wrapper {
    grid-template-columns: 1fr;
    padding-top: 0;
    gap: 0;
  }

  .calc-section { display: none; }

  .results-section {
    animation: none;
  }

  .summary-card,
  .breakdown-block,
  .water-block,
  .tips-block {
    break-inside: avoid;
    border: 1px solid #999 !important;
    background: white !important;
    box-shadow: none !important;
  }

  .card-value { color: #000 !important; }
  .section-label { color: #333 !important; }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
  }
}

/* ── Responsive tweaks ───────────────────────────────────────── */
@media (max-width: 600px) {
  .summary-grid { grid-template-columns: 1fr 1fr; }
  .tips-list { grid-template-columns: 1fr; }
  .calc-section { padding: 1.2rem; }
  .brand-title { font-size: 0.95rem; }
  .btn-calculate { width: 100%; justify-content: center; }
}