/* =============================================

   Tank Logic — tool.css  v3

   Shared layout & components for all tool pages

   ============================================= */

/* ─── TOOL HERO ──────────────────────────────── */

.tool-hero {
  padding-top: calc(var(--nav-h) + 56px);
  padding-bottom: 44px;
  border-bottom: 1px solid var(--border);
}

.tool-hero__inner { max-width: 680px; }

.tool-hero__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.breadcrumb {
  font-size: var(--sz-12);
  font-weight: 500;
  color: var(--tx);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--t) var(--ease);
}

.breadcrumb:hover { color: var(--tx); }

/* ─── TOOL LAYOUT ────────────────────────────── */

.tool-section { padding-block: 44px; }

.tool-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

/* ─── PANELS ─────────────────────────────────── */

.tool-card-panel {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 24px;
  margin-bottom: 16px;
}

.tool-card-panel:last-child { margin-bottom: 0; }

.panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.panel-title-row .panel-title { margin-bottom: 0; }

/* ─── SHAPE SELECTOR ─────────────────────────── */

.shape-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 13px;
}

.shape-btn {
  flex: 1;
  min-width: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: rgba(255,255,255,0.018);
  cursor: pointer;
  font-size: var(--sz-12);
  font-weight: 600;
  color: var(--tx);
  font-family: var(--font);
  transition: all var(--t) var(--ease);
  user-select: none;
}

.shape-btn:hover {
  border-color: var(--border-mid);
  color: var(--tx-hi);
}

.shape-btn.active {
  border-color: rgba(0,200,150,0.3);
  background: var(--accent-lo);
  color: var(--accent);
}

.shape-icon { font-size: 1.3rem; line-height: 1; }

/* ─── UNIT TOGGLE ────────────────────────────── */

.unit-toggle {
  display: flex;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 3px;
  gap: 2px;
}

.unit-btn.active {
  background: var(--accent);
  color: #021a12;
  font-weight: 700;
}

/* ─── INPUTS ─────────────────────────────────── */

.inputs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 13px;
  margin-bottom: 18px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

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

.tool-input::-webkit-outer-spin-button,

.tool-input::-webkit-inner-spin-button { -webkit-appearance: none; }

.tool-input::placeholder { color: var(--tx-xlo); font-weight: 400; }

.tool-input:focus {
  border-color: rgba(0,200,150,0.38);
  box-shadow: 0 0 0 3px rgba(0,200,150,0.08);
}

.tool-input.error {
  border-color: rgba(239,68,68,0.4);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.08);
}

.input-unit {
  position: absolute;
  right: 11px;
  font-size: var(--sz-12);
  font-weight: 600;
  color: var(--tx-lo);
  pointer-events: none;
  letter-spacing: 0.02em;
}

/* Select */

.tool-select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 32px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' viewBox='0 0 10 7'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%234a6080' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.tool-select option { background: var(--bg-1); color: var(--tx-hi); }

/* ─── RESULTS ────────────────────────────────── */

.results-panel {
  border-color: rgba(0,200,150,0.18) !important;
  animation: slide-in 0.28s var(--ease);
}

@keyframes slide-in {
  from { opacity: 0; transform: translateY(9px); }
  to   { opacity: 1; transform: translateY(0); }
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}

.result-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 15px;
  text-align: center;
}

.result-card--primary {
  border-color: rgba(0,200,150,0.22);
  background: var(--accent-lo);
}

/* ─── ERRORS ─────────────────────────────────── */

.tool-error {
  background: var(--red-lo);
  border: 1px solid rgba(239,68,68,0.2);
  border-radius: var(--r-lg);
  padding: 12px 15px;
  font-size: var(--sz-13);
  color: #f87171;
  animation: slide-in 0.22s var(--ease);
}

/* ─── TOOL SIDEBAR ───────────────────────────── */

.tool-sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Preset list */

.preset-list { display: flex; flex-direction: column; gap: 5px; }

.preset-btn.active-preset {
  border-color: rgba(0,200,150,0.28);
  color: var(--accent);
  background: var(--accent-lo);
}

/* ─── SEO CONTENT ────────────────────────────── */

.seo-content {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
}

.seo-content__inner { max-width: 680px; }

.seo-list {
  list-style: decimal;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.seo-list li {
  font-size: var(--sz-14);
  color: var(--tx);
  line-height: 1.7;
  padding-left: 4px;
}

/* ─── RESPONSIVE ─────────────────────────────── */

@media (min-width: 900px) {
  .tool-layout { grid-template-columns: 1fr 316px; }
}

@media (max-width: 480px) {
  .inputs-grid    { grid-template-columns: 1fr; }
  .results-grid   { grid-template-columns: 1fr 1fr; }
  .shape-selector { gap: 6px; }
  .shape-btn      { padding: 10px 6px; font-size: var(--sz-11); }
}

/* ════════════════════════════════════════════════

   TANK CALCULATOR — UNIT SELECTOR

   ════════════════════════════════════════════════ */

.unit-selector-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  padding: 14px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}

.unit-selector-label {
  font-size: var(--sz-13);
  font-weight: 600;
  color: var(--tx);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.unit-selector-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.unit-big-btn:hover {
  border-color: var(--border-mid);
  color: var(--tx);
}

.unit-big-icon { font-size: 1rem; }

.unit-big-name { font-size: var(--sz-13); font-weight: 600; letter-spacing: -0.01em; }

.unit-big-abbr {
  font-size: var(--sz-11);
  font-weight: 700;
  color: var(--tx-xlo);
  background: var(--bg-2);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.unit-big-btn.active .unit-big-abbr {
  background: var(--accent-mid);
  border-color: rgba(0,200,150,0.25);
  color: var(--accent);
}

/* Result section label */

.result-section-label {
  font-size: var(--sz-11);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tx-lo);
  margin-bottom: 8px;
}

.results-grid--2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.result-card--primary-blue {
  border-color: rgba(59,130,246,0.22);
  background: var(--blue-lo);
}

.result-card--primary-blue .result-value { color: var(--blue); }

/* ════════════════════════════════════════════════

   SMART RESULT CARDS

   ════════════════════════════════════════════════ */

.smart-card--teal  .smart-card__icon { background: var(--accent-lo); }

.smart-card--gold  .smart-card__icon { background: var(--gold-lo);   }

.smart-card--green .smart-card__icon { background: rgba(34,197,94,0.08); }

.smart-card--blue  .smart-card__icon { background: var(--blue-lo);   }

.smart-card__notes {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 4px;
}

/* Stocking ideas list */

.smart-idea strong { color: var(--tx-hi); font-weight: 600; }

/* Walstad substrate layers */

.walstad-layer:last-child { border-bottom: none; }

/* Plant recommendations */

.plant-row:last-child { border-bottom: none; }

/* Water change table */

.wc-row--highlight td {
  background: var(--accent-lo);
  color: var(--tx-hi);
  font-weight: 600;
}

.wc-row--highlight td:first-child { color: var(--accent); }

/* ════════════════════════════════════════════════

   STOCKING CALCULATOR — UNIT TOGGLE + FILTER

   ════════════════════════════════════════════════ */

.filter-modifier-select:focus {
  border-color: rgba(0,200,150,0.35);
}

.filter-modifier-select option { background: var(--bg-1); }

/* ════════════════════════════════════════════════

   RESPONSIVE

   ════════════════════════════════════════════════ */

@media (min-width: 640px) {
  .smart-cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .smart-cards-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ─── SMART RESULT CARDS (Tank Calculator) ──────── */

.smart-cards-section {
  margin-top: 0;
  padding-top: 0;
}

.smart-cards-heading {
  font-size: var(--sz-11);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--tx);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.smart-cards-heading::before {
  content: '';
  position: absolute;
  bottom: -1px; left: 0;
  width: 40px; height: 1px;
  background: var(--accent);
}

.smart-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.smart-card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 18px 20px;
  animation: slide-in 0.3s var(--ease) both;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.smart-card--teal   { border-color: rgba(0,200,150,0.18); }

.smart-card--gold   { border-color: rgba(232,160,32,0.18);  }

.smart-card--green  { border-color: rgba(34,197,94,0.18);   }

.smart-card--blue   { border-color: rgba(59,130,246,0.18);  }

.smart-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.smart-card__icon {
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  background: var(--bg-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.smart-card__title {
  font-size: var(--sz-14);
  font-weight: 700;
  color: var(--tx-hi);
  letter-spacing: -0.018em;
  line-height: 1.2;
}

.smart-card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--sz-12);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
  margin-top: auto;
  text-decoration: none;
  transition: gap var(--t) var(--ease);
}

.smart-card__link:hover { gap: 7px; }

/* Stocking ideas list */

.smart-ideas {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.smart-idea {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  background: var(--bg-2);
  border-radius: var(--r-md);
  font-size: var(--sz-12);
  color: var(--tx);
  line-height: 1.5;
}

.smart-idea__icon { flex-shrink: 0; font-size: 1rem; line-height: 1.4; }

.smart-idea__note { color: var(--tx); display: block; font-size: var(--sz-12); margin-top: 3px; }

/* Walstad layers */

.smart-walstad {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.walstad-layer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 9px 12px;
  border-radius: var(--r-md);
  font-size: var(--sz-12);
  background: var(--bg-2);
}

.walstad-layer--mineral {
  background: rgba(232,160,32,0.05);
  border: 1px solid rgba(232,160,32,0.1);
}

.walstad-layer__label { color: var(--tx); font-weight: 600; }

.walstad-layer__val   { color: var(--tx); }

/* Plant rows */

.smart-plants {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.plant-row {
  display: flex;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-2);
  border-radius: var(--r-md);
  font-size: var(--sz-12);
  line-height: 1.5;
}

.plant-row--meta {
  background: rgba(0,200,150,0.04);
  border: 1px solid rgba(0,200,150,0.1);
}

.plant-zone {
  flex-shrink: 0;
  font-weight: 700;
  color: var(--tx);
  min-width: 80px;
  font-size: var(--sz-11);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding-top: 1px;
}

/* Water change table */

.wc-table-wrap {
  overflow-x: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
}

.wc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--sz-12);
  min-width: 300px;
}

.wc-table th {
  background: var(--bg-2);
  padding: 9px 12px;
  text-align: left;
  font-size: var(--sz-10);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--tx-lo);
  border-bottom: 1px solid var(--border);
}

.wc-table td {
  padding: 9px 12px;
  color: var(--tx);
  border-bottom: 1px solid var(--border);
}

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

.wc-table tr.wc-row--highlight td {
  color: var(--tx-hi);
  font-weight: 600;
  background: rgba(0,200,150,0.04);
}

.wc-table tr:hover td { background: rgba(255,255,255,0.02); }

/* Unit toggle (big buttons in tank calculator) */

.unit-big-btn-group {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
}

.unit-big-btn {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg-2);
  color: var(--tx-lo);
  font-size: var(--sz-13);
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  text-align: center;
  transition: all var(--t) var(--ease);
  letter-spacing: -0.01em;
}

.unit-big-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #021a12;
}

.unit-big-btn:hover:not(.active) { border-color: var(--border-mid); color: var(--tx); }

/* Result unit badge */

.result-unit-badge {
  display: inline-flex;
  font-size: var(--sz-10);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--tx-xlo);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 2px 8px;
  margin-bottom: 12px;
}

/* Stocking calculator unit bar */

.stocking-unit-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  padding: 10px 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}

.stocking-unit-bar__label {
  font-size: var(--sz-11);
  font-weight: 600;
  color: var(--tx);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stocking-toggle {
  display: flex;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 2px;
  gap: 2px;
}

.stocking-toggle-btn {
  padding: 4px 10px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--tx-lo);
  font-size: var(--sz-12);
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
  transition: all var(--t) var(--ease);
  letter-spacing: -0.01em;
}

.stocking-toggle-btn.active {
  background: var(--accent);
  color: #021a12;
}

/* Filtration modifier row */

.filter-modifier-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}

.filter-modifier-label {
  font-size: var(--sz-12);
  font-weight: 600;
  color: var(--tx);
}

.filter-modifier-select {
  flex: 1;
  min-width: 140px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 6px 10px;
  font-size: var(--sz-12);
  font-family: var(--font);
  color: var(--tx);
  outline: none;
  cursor: pointer;
}

.filter-modifier-bonus {
  font-size: var(--sz-11);
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-lo);
  border: 1px solid rgba(0,200,150,0.15);
  border-radius: 100px;
  padding: 2px 8px;
}

/* Stocking warnings */

.stocking-warning {
  font-size: var(--sz-12);
  color: var(--tx);
  line-height: 1.6;
  padding: 9px 12px;
  background: rgba(239,68,68,0.06);
  border: 1px solid rgba(239,68,68,0.15);
  border-radius: var(--r-md);
}

/* Gauge colour variants */

.gauge-fill--under   { background: linear-gradient(90deg, var(--blue), #60a5fa); }

.gauge-fill--balanced { background: linear-gradient(90deg, var(--accent), #22c55e); }

.gauge-fill--full    { background: linear-gradient(90deg, var(--accent), var(--gold)); }

.gauge-fill--light   { background: linear-gradient(90deg, var(--gold), #f97316); }

.gauge-fill--danger  { background: linear-gradient(90deg, #f97316, var(--red)); }

/* Rating badge variants */

.rating-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  font-size: var(--sz-14);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-family: var(--font);
}

.rating-badge--under   { background: var(--blue-lo); border: 1px solid var(--blue-mid); color: var(--blue); }

.rating-badge--balanced { background: var(--accent-lo); border: 1px solid var(--accent-mid); color: var(--accent); }

.rating-badge--full    { background: rgba(34,197,94,0.07); border: 1px solid rgba(34,197,94,0.15); color: #22c55e; }

.rating-badge--light   { background: var(--gold-lo); border: 1px solid rgba(232,160,32,0.18); color: var(--gold); }

.rating-badge--danger  { background: var(--red-lo); border: 1px solid rgba(239,68,68,0.2); color: var(--red); }

/* Responsive smart cards */

@media (min-width: 640px) {
  .smart-cards-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── Sidebar panel prose ─────────────────────── */
.sidebar-panel p,
.sidebar-panel .sidebar-desc {
  font-size: var(--sz-13);
  color: var(--tx);
  line-height: 1.65;
}

/* ── Smart card text ─────────────────────────── */
.smart-card__title  { font-size: var(--sz-15); }
.smart-card__sub    { font-size: var(--sz-13); color: var(--tx); line-height: 1.5; }
.smart-idea strong  { font-size: var(--sz-14); }
.smart-idea__note   { font-size: var(--sz-13); color: var(--tx); }
.smart-card__notes p { font-size: var(--sz-13); color: var(--tx); line-height: 1.65; }
.smart-card__link   { font-size: var(--sz-13); }

/* ── Walstad / plant labels ──────────────────── */
.walstad-layer__label { font-size: var(--sz-13); }
.walstad-layer__val   { font-size: var(--sz-13); }
.plant-zone  { font-size: var(--sz-13); font-weight: 600; }
.plant-val   { font-size: var(--sz-13); }

/* ── Water change table ──────────────────────── */
.wc-row td { font-size: var(--sz-14); }

/* ── SEO content (tool pages) ────────────────── */
.seo-content__inner p  { font-size: var(--sz-16); color: var(--tx); line-height: 1.82; }
.seo-content__inner li { font-size: var(--sz-16); color: var(--tx); line-height: 1.76; }
.seo-content__inner h2 { color: var(--tx-hi); }
.seo-content__inner h3 { color: var(--tx-hi); font-size: var(--sz-17); margin-top: 36px; }

/* ── Shape btn ───────────────────────────────── */
.shape-btn   { font-size: var(--sz-13); }
.shape-hint  { font-size: var(--sz-13); color: var(--tx); line-height: 1.6; }

/* ── Preset buttons ──────────────────────────── */
.preset-btn       { font-size: var(--sz-14); }
.preset-btn span  { font-size: var(--sz-12); color: var(--tx-lo); }