/* ═══════════════════════════════════════
   CALCULATOR PAGES
   ═══════════════════════════════════════ */

.calc-page {
  position: relative; z-index: 1;
  min-height: 100vh;
  padding: 90px 24px 60px;
  display: flex; flex-direction: column; align-items: center;
}

/* Breadcrumb */
.calc-breadcrumb {
  width: 100%; max-width: 800px;
  margin-bottom: 18px;
  font-size: 0.78rem; color: var(--text-muted);
}
.calc-breadcrumb a {
  color: var(--accent); text-decoration: none; font-weight: 600;
}
.calc-breadcrumb a:hover { text-decoration: underline; }
.calc-breadcrumb span { margin: 0 6px; opacity: 0.5; }

/* Calculator card */
.calc-card {
  width: 100%; max-width: 800px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px; padding: 40px;
  backdrop-filter: blur(28px);
  box-shadow: 0 28px 70px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.04) inset;
  position: relative; overflow: hidden;
  transition: background 0.5s, border-color 0.5s;
}
.calc-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}

.calc-card h1 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: 2px; color: var(--text);
  text-shadow: 0 0 40px var(--accent-glow);
  margin-bottom: 8px; text-align: left; line-height: 1.1;
}
.calc-card .calc-subtitle {
  font-size: 0.9rem; color: var(--text-muted); margin-bottom: 32px;
  font-weight: 300; line-height: 1.6;
}

/* Form fields */
.calc-form { display: flex; flex-direction: column; gap: 20px; }

.calc-field {
  display: flex; flex-direction: column; gap: 6px;
}
.calc-field label {
  font-size: 0.76rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent); opacity: 0.85;
}
.calc-field input,
.calc-field select {
  background: var(--bg1);
  border: 1px solid var(--card-border);
  border-radius: 12px; padding: 12px 16px;
  font-family: 'Nunito', sans-serif; font-size: 0.95rem;
  color: var(--text); outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.calc-field input:focus,
.calc-field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
}
.calc-field select { cursor: pointer; }
.calc-field select option { background: var(--bg0); color: var(--text); }
.calc-field .field-hint {
  font-size: 0.72rem; color: var(--text-muted); font-weight: 300;
}

/* Row layout for side-by-side fields */
.calc-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.calc-row-3 {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px;
}

/* Calculate button */
.calc-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  color: var(--btn-text); border: none; border-radius: 12px;
  padding: 14px 32px; margin-top: 8px;
  font-family: 'Nunito', sans-serif; font-size: 0.88rem; font-weight: 800;
  letter-spacing: 0.06em; text-transform: uppercase;
  cursor: pointer; transition: all 0.25s;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.calc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  filter: brightness(1.08);
}

/* Results panel */
.calc-result {
  display: none;
  margin-top: 28px; padding-top: 28px;
  border-top: 1px solid var(--card-border);
}
.calc-result.visible { display: block; }

.calc-result-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.3rem; letter-spacing: 2px; color: var(--text);
  margin-bottom: 16px;
}

.result-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-bottom: 20px;
}
.result-item {
  background: var(--toggle-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px; padding: 16px 18px;
  transition: border-color 0.3s;
}
.result-item:hover { border-color: var(--accent); }
.result-label {
  font-size: 0.66rem; font-weight: 800; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 4px; opacity: 0.75;
}
.result-value {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.6rem; letter-spacing: 1px; color: var(--text); line-height: 1.1;
}
.result-note {
  font-size: 0.72rem; color: var(--text-muted); font-weight: 300; margin-top: 2px;
}

/* Primary result — big highlight */
.result-primary {
  grid-column: 1 / -1;
  background: var(--cost-grad);
  border: 1px solid var(--card-border);
  border-radius: 16px; padding: 22px 26px;
  text-align: center; position: relative; overflow: hidden;
}
.result-primary::before {
  content: ''; position: absolute; top: -60%; left: -5%;
  width: 280px; height: 200%;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 60%);
  pointer-events: none;
}
.result-primary .result-label { color: rgba(255,255,255,0.8); }
.result-primary .result-value {
  font-size: 2.4rem; color: #fff;
  text-shadow: 0 0 24px var(--accent-glow);
}
.result-primary .result-note { color: rgba(255,255,255,0.6); }

/* Formula box */
.calc-formula {
  background: var(--bg1);
  border: 1px solid var(--card-border);
  border-radius: 12px; padding: 16px 20px;
  margin-top: 16px;
  font-family: 'Courier New', monospace;
  font-size: 0.82rem; color: var(--text-muted);
  line-height: 1.6; overflow-x: auto;
}
.calc-formula strong { color: var(--accent); font-weight: 700; }

/* ═══════════════════════════════════════
   SEO CONTENT SECTION
   ═══════════════════════════════════════ */
.calc-seo {
  width: 100%; max-width: 800px;
  margin-top: 32px;
}
.calc-seo-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px; padding: 32px;
  backdrop-filter: blur(20px);
}
.calc-seo-card h2 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.5rem; letter-spacing: 1.5px; color: var(--text);
  margin-bottom: 14px;
}
.calc-seo-card h3 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.1rem; letter-spacing: 1px; color: var(--text);
  margin: 20px 0 8px;
}
.calc-seo-card p {
  font-size: 0.88rem; color: var(--text-muted); line-height: 1.7;
  margin-bottom: 12px; font-weight: 300;
}
.calc-seo-card ul {
  margin: 8px 0 16px 20px;
  font-size: 0.85rem; color: var(--text-muted); line-height: 1.8;
}
.calc-seo-card table {
  width: 100%; border-collapse: collapse; margin: 12px 0 16px;
  font-size: 0.82rem;
}
.calc-seo-card th {
  text-align: left; padding: 8px 12px;
  font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent);
  border-bottom: 1px solid var(--card-border);
}
.calc-seo-card td {
  padding: 8px 12px; color: var(--text-muted);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* ═══════════════════════════════════════
   RELATED CALCULATORS
   ═══════════════════════════════════════ */
.calc-related {
  width: 100%; max-width: 800px;
  margin-top: 28px;
}
.calc-related h2 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.3rem; letter-spacing: 1.5px; color: var(--text);
  margin-bottom: 14px;
}
.related-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
}
.related-link {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px; padding: 18px 16px;
  text-decoration: none; text-align: center;
  transition: all 0.25s;
}
.related-link:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--accent-glow);
}
.related-emoji { font-size: 1.5rem; margin-bottom: 8px; }
.related-name {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 0.95rem; letter-spacing: 1px; color: var(--text);
}

/* ═══════════════════════════════════════
   CALCULATOR INDEX PAGE
   ═══════════════════════════════════════ */
.calc-index-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
  width: 100%; max-width: 800px;
}
.calc-index-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px; padding: 24px;
  backdrop-filter: blur(20px);
  text-decoration: none;
  transition: all 0.3s;
  display: flex; flex-direction: column; gap: 8px;
}
.calc-index-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 36px var(--accent-glow);
}
.calc-index-emoji { font-size: 2rem; }
.calc-index-name {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.2rem; letter-spacing: 1px; color: var(--text);
}
.calc-index-desc {
  font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; font-weight: 300;
}
.calc-index-tag {
  display: inline-block; margin-top: 4px;
  font-size: 0.62rem; font-weight: 800; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 3px 10px;
  border-radius: 100px;
}
.calc-tag-reef { background: rgba(0,229,255,0.12); border: 1px solid rgba(0,229,255,0.25); color: #00E5FF; }
.calc-tag-fresh { background: rgba(57,232,122,0.12); border: 1px solid rgba(57,232,122,0.25); color: #39E87A; }
.calc-tag-both { background: rgba(255,200,50,0.12); border: 1px solid rgba(255,200,50,0.25); color: #FFB830; }

/* ═══════════════════════════════════════
   NAV DROPDOWN
   ═══════════════════════════════════════ */
.nav-dropdown {
  position: relative;
}
.nav-dropdown > a { cursor: pointer; }
.nav-dropdown-menu {
  display: none;
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  min-width: 220px; padding: 8px 0; margin-top: 0;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  backdrop-filter: blur(20px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
  z-index: 200;
}
/* Invisible bridge so hover doesn't break when moving to the dropdown */
.nav-dropdown::after {
  content: '';
  position: absolute; left: 0; right: 0; top: 100%; height: 16px;
  display: none;
}
.nav-dropdown:hover::after { display: block; }
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 18px;
  font-size: 0.78rem !important; font-weight: 600 !important;
  color: var(--text-muted) !important;
  text-decoration: none; text-transform: none !important;
  letter-spacing: 0 !important;
  transition: background 0.2s, color 0.2s;
}
.nav-dropdown-menu a:hover {
  background: var(--toggle-bg);
  color: var(--accent) !important;
}
.nav-dropdown-menu .dd-emoji { font-size: 1rem; width: 24px; text-align: center; }

/* ═══════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════ */
@media (max-width: 700px) {
  .calc-page { padding: 76px 16px 40px; }
  .calc-card { padding: 24px 18px; border-radius: 18px; }
  .calc-card h1 { font-size: 1.6rem; }
  .calc-row, .calc-row-3 { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .result-primary .result-value { font-size: 1.8rem; }
  .related-grid { grid-template-columns: 1fr; }
  .calc-index-grid { grid-template-columns: 1fr; }
  #recGrid { grid-template-columns: 1fr !important; }
  .calc-seo-card { padding: 22px 16px; }
  .calc-btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .calc-card { padding: 18px 14px; border-radius: 14px; }
  .calc-seo-card { padding: 18px 14px; border-radius: 14px; }
}