/* ============================================================
   AQUA TOOLS — Foglio di stile unificato
   Copre: CO2 Calculator · AquaControl Panel · Forfettario
   ============================================================ */

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

body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 24px 16px;
}

/* ---------- Design Tokens ---------- */
:root {
  /* Brand greens */
  --green-primary: #11998e;
  --green-light: #38ef7d;
  --green-dark: #0d7377;
  --green-mid: #14a085;
  --green-pale: #d4edda;
  --green-bg: #e8f5e9;
  --green-border: #a5d6a7;
  --green-muted: #c8e6c9;

  /* Teal */
  --teal-primary: #4db6ac;
  --teal-light: #b2dfdb;
  --teal-dark: #00695c;
  --teal-deeper: #004d40;

  /* Blues */
  --blue-primary: #0ea5e9;
  --blue-dark: #0284c7;

  /* Purples */
  --purple: #8b5cf6;
  --indigo: #4f46e5;

  /* Neutral */
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --input-border: #cbd5e1;

  /* Status */
  --warning-bg: #fff3cd;
  --warning-border: #ffc107;
  --warning-text: #856404;
  --danger-text: #ef4444;
  --success-text: #166534;
  --success-bg: #dcfce7;

  /* Shadows */
  --shadow-green: 0 20px 60px rgba(17, 153, 142, 0.4);
  --shadow-blue: 0 10px 25px -5px rgba(14, 165, 233, 0.3);
  --shadow-card: 0 12px 20px rgba(0, 0, 0, 0.05);
  --shadow-thumb: 0 2px 8px rgba(17, 153, 142, 0.4);

  /* Gradients */
  --grad-green: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  --grad-blue: linear-gradient(135deg, #0ea5e9, #0284c7);
  --grad-result-bg: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
  --grad-teal: linear-gradient(135deg, #b2dfdb 0%, #80cbc4 100%);

  /* Spacing & Shape */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 20px;
  --radius-pill: 50px;
}

/* ---------- Layout Containers ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
}

.container--centered {
  max-width: 600px;
  width: 100%;
  margin: auto;
  background: var(--card);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-green);
}

.body--flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  background: var(--grad-green);
}

/* ---------- Typography ---------- */
h1 {
  color: var(--green-dark);
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 10px;
}

h1.h1--blue { color: var(--blue-dark); }

.subtitle {
  color: var(--green-mid);
  text-align: center;
  font-size: 14px;
  margin-bottom: 30px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: #0284c7;
}

.desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 3px;
  line-height: 1.4;
}

/* ---------- Volume Section ---------- */
.volume-section {
  background: var(--grad-blue);
  color: white;
  padding: 24px 30px;
  border-radius: var(--radius-xl);
  margin-bottom: 24px;
  display: flex;
  gap: 32px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  box-shadow: var(--shadow-blue);
}

.vol-field {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.vol-field label {
  display: block;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.75rem;
  font-weight: 700;
}

.vol-field input {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-md);
  color: white;
  font-size: 2rem;
  font-weight: 800;
  width: 140px;
  text-align: center;
  outline: none;
  transition: all 0.3s;
}

.vol-field input:focus {
  background: rgba(255, 255, 255, 0.3);
  border-color: white;
}

.vol-field input::placeholder { color: rgba(255, 255, 255, 0.5); }

.vol-sep {
  font-size: 1.4rem;
  opacity: 0.5;
  align-self: flex-end;
  padding-bottom: 8px;
}

/* ---------- Grid & Cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.card--kh { border-left: 4px solid #8b5cf6; }
.card--gh { border-left: 4px solid #06b6d4; }

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
}

.title-group h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}

/* ---------- Badges ---------- */
.badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  white-space: nowrap;
}

.badge--daily    { background: var(--success-bg); color: var(--success-text); }
.badge--weekly   { background: #fef9c3; color: #854d0e; }
.badge--water-change { background: #dbeafe; color: #1e40af; }
.badge--kh       { background: #ede9fe; color: #5b21b6; }
.badge--gh       { background: #cffafe; color: #0e7490; }

/* ---------- Input Groups ---------- */
.input-group { margin-bottom: 30px; }

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

label {
  color: var(--green-dark);
  font-weight: 600;
  font-size: 14px;
}

.value-display {
  background: var(--grad-green);
  color: white;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 14px;
  min-width: 60px;
  text-align: center;
}

/* Range slider */
input[type="range"] {
  width: 100%;
  height: 8px;
  background: var(--green-pale);
  border-radius: 10px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: var(--grad-green);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-thumb);
  transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--grad-green);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-thumb);
  transition: transform 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover { transform: scale(1.2); }

/* Text / number inputs */
input[type="number"],
input[type="text"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
  transition: box-shadow 0.2s, border-color 0.2s;
  background: var(--card);
  color: var(--text);
}

input[type="number"]:focus,
input[type="text"]:focus {
  border-color: var(--green-primary);
  box-shadow: 0 0 0 3px rgba(17, 153, 142, 0.1);
}

/* Inline input row */
.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  margin-bottom: 10px;
  background: #f8fafc;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.input-row input {
  width: 80px;
  padding: 6px 8px;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  text-align: right;
  background: white;
  color: var(--text);
  outline: none;
}

.input-row input:focus {
  border-color: var(--blue-primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

/* ---------- Toggle Switch ---------- */
.cambio-flag {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.78rem;
  color: #475569;
  margin-bottom: 12px;
  cursor: pointer;
  user-select: none;
}

.cambio-flag input[type="checkbox"] { display: none; }

.toggle-track {
  width: 34px;
  height: 18px;
  background: var(--input-border);
  border-radius: var(--radius-pill);
  position: relative;
  transition: background 0.25s;
  flex-shrink: 0;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  transition: transform 0.25s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.cambio-flag input:checked + .toggle-track { background: var(--blue-primary); }
.cambio-flag input:checked + .toggle-track::after { transform: translateX(16px); }
.cambio-flag strong { color: var(--blue-dark); }

/* ---------- Select ---------- */
select {
  width: 100%;
  padding: 10px 15px;
  border: 2px solid var(--green-pale);
  border-radius: 10px;
  font-size: 14px;
  color: var(--green-dark);
  background: white;
  cursor: pointer;
  transition: all 0.3s ease;
}

select:focus {
  outline: none;
  border-color: var(--green-primary);
  box-shadow: 0 0 0 3px rgba(17, 153, 142, 0.1);
}

.diffuser-select { margin-top: 10px; }

/* ---------- Result Cards (CO2 calc) ---------- */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}

.result-card {
  background: var(--grad-result-bg);
  border-radius: 15px;
  padding: 20px;
  text-align: center;
  border: 2px solid var(--green-border);
}

.result-card.full-width { grid-column: 1 / -1; }

.result-label {
  color: #2e7d32;
  font-size: 12px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.result-value {
  font-size: 36px;
  font-weight: bold;
  color: var(--green-primary);
  margin: 5px 0;
}

.result-unit {
  color: #388e3c;
  font-size: 14px;
  font-weight: 600;
}

/* Result values (AquaControl) */
.results-area {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid #f1f5f9;
}

.main-res {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--blue-dark);
  display: block;
}

.sub-res {
  font-size: 0.85rem;
  color: var(--purple);
  font-weight: 600;
  margin-top: 4px;
  display: block;
}

.base-hint {
  font-size: 0.72rem;
  color: #94a3b8;
  margin-top: 2px;
  display: block;
}

.kh-main { color: #7c3aed !important; }
.gh-main { color: #0891b2 !important; }

/* ---------- Mineral rows (KH/GH cards) ---------- */
.mineral-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.mineral-row {
  background: #f8fafc;
  border-radius: var(--radius-sm);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mineral-row label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.mineral-row input {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  background: white;
  color: var(--text);
  outline: none;
}

.mineral-row input:focus {
  border-color: #8b5cf6;
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.card--gh .mineral-row input:focus {
  border-color: #06b6d4;
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.mineral-info {
  font-size: 0.72rem;
  color: #94a3b8;
  margin-top: 4px;
  line-height: 1.5;
}

.mineral-info span {
  display: inline-block;
  background: #f1f5f9;
  border-radius: 4px;
  padding: 1px 6px;
  margin: 1px 2px;
}

/* ---------- Mode Toggle (KH/GH target vs delta) ---------- */
.mode-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

.mode-btn {
  flex: 1;
  padding: 6px 8px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: white;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.card--kh .mode-btn.active { background: #ede9fe; border-color: #8b5cf6; color: #5b21b6; }
.card--gh .mode-btn.active { background: #cffafe; border-color: #06b6d4; color: #0e7490; }

.mode-section { display: none; }
.mode-section.visible { display: block; }

.delta-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

/* ---------- Info / Warning / Note ---------- */
.info {
  font-size: 13px;
  color: #2e7d32;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 2px solid rgba(46, 125, 50, 0.2);
}

.warning {
  background: var(--warning-bg);
  border-left: 4px solid var(--warning-border);
  padding: 12px;
  margin-top: 15px;
  border-radius: 5px;
  font-size: 13px;
  color: var(--warning-text);
}

.note {
  background: #f1f8f4;
  border-left: 4px solid var(--green-primary);
  padding: 12px;
  margin-top: 20px;
  border-radius: 5px;
  font-size: 12px;
  color: var(--green-dark);
  line-height: 1.6;
}

/* ---------- Bubble Info Panel ---------- */
.bubble-info {
  background: var(--grad-teal);
  border-radius: 15px;
  padding: 20px;
  margin-top: 20px;
  border: 2px solid var(--teal-primary);
}

.bubble-info h3 {
  color: var(--teal-dark);
  margin-bottom: 15px;
  text-align: center;
}

.bubble-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

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

.bubble-label {
  color: var(--teal-deeper);
  font-weight: 600;
  font-size: 14px;
}

.bubble-value {
  background: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  font-size: 16px;
  border: 2px solid var(--teal-primary);
}

/* ---------- Advanced Info Table ---------- */
.advanced-info {
  background: var(--green-bg);
  border-radius: 10px;
  padding: 15px;
  margin-top: 15px;
  border: 2px solid var(--green-border);
}

.advanced-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--green-muted);
  font-size: 13px;
}

.advanced-row:last-child { border-bottom: none; }
.advanced-label { color: #2e7d32; font-weight: 600; }
.advanced-value { color: var(--green-primary); font-weight: 700; }

/* ---------- Forfettario ---------- */
.forfettario-wrapper {
  background: var(--card);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 20px 40px rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.tab-nav {
  display: flex;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.tab-btn {
  padding: 8px 12px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.tab-btn:hover { color: var(--indigo); }
.tab-btn--active { color: var(--indigo); border-bottom-color: var(--indigo); }

.result-panel--green {
  background: #f0fdf4;
  padding: 24px;
  border-radius: var(--radius-md);
}

.result-panel--green .panel-label { color: #15803d; font-size: 1.1rem; font-weight: 600; }
.result-panel--green .panel-value { color: #14532d; font-size: 2rem; font-weight: 800; }

.result-panel--yellow {
  background: #fefce8;
  padding: 24px;
  border-radius: var(--radius-md);
}

.result-panel--yellow .panel-label { color: #a16207; font-size: 1.1rem; font-weight: 600; }
.result-panel--yellow .panel-value { color: #713f12; font-size: 2rem; font-weight: 800; }

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  font-size: 0.95rem;
}

.detail-row + .detail-row { border-top: 1px solid var(--border); }
.detail-label { font-weight: 600; color: var(--text); }
.detail-blue  { font-weight: 700; color: var(--blue-dark); }
.detail-red   { font-weight: 700; color: var(--danger-text); }

.detail-strong {
  font-weight: 700;
  color: var(--danger-text);
  padding-top: 16px;
  margin-top: 8px;
  border-top: 2px solid var(--border);
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--indigo);
  margin-bottom: 12px;
}

/* ---------- Utility ---------- */
.hidden { display: none !important; }
.mt-auto { margin-top: auto; }

.text-footer {
  text-align: center;
  margin-top: 40px;
  color: #94a3b8;
  font-size: 0.8rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .grid,
  .results-grid { grid-template-columns: 1fr; }

  .volume-section { gap: 16px; }

  .vol-field input {
    font-size: 1.5rem;
    width: 110px;
  }

  .container--centered { padding: 20px; }

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