/* ============================================
   CLOCK CALCULATOR — page-specific styles
   Accent: cyan/sky — Date & Time category
   Inherits variables from css/styles.css
   ============================================ */

/* ---- Page wrapper ---- */
.calc-page {
  position: relative; z-index: 1;
  max-width: 1320px; margin: 0 auto;
  padding: 48px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 460px;
  grid-template-rows: auto auto;
  gap: 48px; align-items: start;
}

/* ---- Left column ---- */
.calc-page-info {
  position: static;
}

/* Breadcrumb */
.calc-breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-dim); margin-bottom: 20px; flex-wrap: wrap;
}
.calc-breadcrumb a { color: var(--text-dim); transition: color var(--transition); }
.calc-breadcrumb a:hover { color: var(--accent); }
.calc-breadcrumb i { font-size: 10px; }

/* Category tag — cyan/sky for Date & Time */
.calc-page-tag {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 12px 4px 8px;
  background: rgba(6, 182, 212, 0.12); border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 100px; font-size: 12px; font-weight: 600; color: #06b6d4;
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 18px;
}
body.light-theme .calc-page-tag {
  background: rgba(8, 145, 178, 0.08); border-color: rgba(8, 145, 178, 0.2); color: #0891b2;
}

/* Page title */
.calc-page-title {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: clamp(28px, 3.2vw, 46px); font-weight: 800;
  line-height: 1.1; letter-spacing: -1.5px; color: var(--text); margin-bottom: 16px;
}
.calc-page-title span { color: #06b6d4; }
body.light-theme .calc-page-title span { color: #0891b2; }

/* Description */
.calc-page-desc { font-size: 16px; line-height: 1.75; color: var(--text-muted); margin-bottom: 32px; }

/* Feature pills */
.calc-features { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 40px; }
.calc-feature-pill {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 100px;
  font-size: 13px; font-weight: 500; color: var(--text-muted);
}
.calc-feature-pill i { color: #06b6d4; font-size: 12px; }
body.light-theme .calc-feature-pill i { color: #0891b2; }

/* Content body */
.calc-page-content {
  margin-top: 0;
  min-width: 0;
}

.calc-page-content.fade-up {
  opacity: 1;
  transform: none;
  animation: none;
  transition: none;
  visibility: visible;
}
.content-block { margin-bottom: 40px; }
.content-block h2 {
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 22px; font-weight: 700;
  letter-spacing: -0.5px; color: var(--text); margin-bottom: 14px;
}
.content-block p { font-size: 15px; line-height: 1.8; color: var(--text-muted); margin-bottom: 10px; }
.content-block strong { color: var(--text); font-weight: 600; }

/* ============================================
   CLOCK FORMULA BOX
   ============================================ */
.clock-formula-box {
  background: var(--bg-3); border: 1px solid var(--border);
  border-left: 3px solid #06b6d4; border-radius: var(--radius); padding: 18px 20px; margin: 16px 0;
}
body.light-theme .clock-formula-box { border-left-color: #0891b2; }
.clock-formula-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: #06b6d4; margin-bottom: 10px;
}
body.light-theme .clock-formula-title { color: #0891b2; }
.clock-formula-body {
  font-family: 'DM Mono', monospace; font-size: 12.5px; line-height: 2; color: var(--text-muted);
}
.cfvar { color: #06b6d4; font-weight: 700; }
body.light-theme .cfvar { color: #0891b2; }
.cfop  { color: #fb923c; font-weight: 700; padding: 0 4px; }
.clock-formula-note {
  font-size: 12px; font-style: italic; color: var(--text-dim);
  margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border);
}

/* ============================================
   USE-CASE GRID
   ============================================ */
.usecase-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 18px 0; }
.usecase-card {
  display: flex; gap: 14px; padding: 15px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}
.usecase-card:hover { border-color: var(--border-hover); }
.usecase-icon {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 8px;
  background: rgba(6,182,212,0.12); border: 1px solid rgba(6,182,212,0.2);
  display: flex; align-items: center; justify-content: center; font-size: 15px; color: #06b6d4;
}
body.light-theme .usecase-icon { background: rgba(8,145,178,0.08); border-color: rgba(8,145,178,0.15); color: #0891b2; }
.usecase-body { display: flex; flex-direction: column; gap: 5px; }
.usecase-body strong { font-size: 13px; font-weight: 700; color: var(--text); }
.usecase-body span   { font-size: 12px; line-height: 1.6; color: var(--text-dim); }

/* ============================================
   TIME REFERENCE TABLE
   ============================================ */
.time-ref-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); margin: 16px 0; }
.time-ref-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.time-ref-table thead tr { background: var(--bg-3); }
body.light-theme .time-ref-table thead tr { background: var(--surface-2, #f1f5f9); }
.time-ref-table th {
  padding: 10px 14px; text-align: left;
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-dim); border-bottom: 1px solid var(--border);
}
.time-ref-table td { padding: 10px 14px; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.time-ref-table tbody tr:last-child td { border-bottom: none; }
.time-ref-table tbody tr:nth-child(even) { background: var(--bg-2); }
.time-ref-table td:first-child { font-weight: 600; color: var(--text); }
.time-ref-table td:not(:first-child) { font-family: 'DM Mono', monospace; font-size: 13px; color: #06b6d4; }
body.light-theme .time-ref-table td:not(:first-child) { color: #0891b2; }

/* ============================================
   TIPS GRID
   ============================================ */
.tips-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 18px 0; }
.tip-card {
  display: flex; gap: 14px; padding: 15px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}
.tip-card:hover { border-color: var(--border-hover); }
.tip-icon {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 8px;
  background: rgba(6,182,212,0.12); border: 1px solid rgba(6,182,212,0.2);
  display: flex; align-items: center; justify-content: center; font-size: 15px; color: #06b6d4;
}
body.light-theme .tip-icon { background: rgba(8,145,178,0.08); border-color: rgba(8,145,178,0.15); color: #0891b2; }
.tip-body { display: flex; flex-direction: column; gap: 5px; }
.tip-body strong { font-size: 13px; font-weight: 700; color: var(--text); }
.tip-body span   { font-size: 12px; line-height: 1.6; color: var(--text-dim); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; transition: border-color var(--transition); }
.faq-item:hover { border-color: var(--border-hover); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 18px; background: transparent; border: none; cursor: pointer;
  font-family: 'DM Sans', sans-serif; font-size: 15px; font-weight: 600; color: var(--text); text-align: left;
  transition: color var(--transition);
}
.faq-question:hover { color: #06b6d4; }
body.light-theme .faq-question:hover { color: #0891b2; }
.faq-question i { font-size: 12px; color: var(--text-dim); transition: transform var(--transition), color var(--transition); flex-shrink: 0; }
.faq-item.open .faq-question i { transform: rotate(180deg); color: #06b6d4; }
body.light-theme .faq-item.open .faq-question i { color: #0891b2; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; font-size: 14px; line-height: 1.75; color: var(--text-muted); padding: 0 18px; }
.faq-item.open .faq-answer { max-height: 500px; padding: 0 18px 16px; }

/* Also search chips */
.also-search-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.also-search-chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 100px;
  font-size: 13px; font-weight: 500; color: var(--text-muted); white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.also-search-chip:hover { background: rgba(6,182,212,0.1); border-color: #06b6d4; color: #06b6d4; }
body.light-theme .also-search-chip:hover { background: rgba(8,145,178,0.07); border-color: #0891b2; color: #0891b2; }

/* ============================================
   CALC CARD
   ============================================ */
.calc-panel { position: sticky; top: calc(var(--header-h) + 24px); }
.calc-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-lg), 0 0 60px rgba(6,182,212,0.07);
}
.calc-card-header {
  padding: 20px 24px 18px; background: var(--bg-2); border-bottom: 1px solid var(--border);
  display: none; align-items: center; gap: 12px;
}
@media (max-width: 1024px) { .calc-card-header { display: flex; } }
.calc-card-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: rgba(6,182,212,0.12); border: 1px solid rgba(6,182,212,0.2);
  display: flex; align-items: center; justify-content: center; font-size: 18px; color: #06b6d4; flex-shrink: 0;
}
body.light-theme .calc-card-icon { background: rgba(8,145,178,0.08); border-color: rgba(8,145,178,0.2); color: #0891b2; }
.calc-card-header-text h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.calc-card-header-text p  { font-size: 12px; color: var(--text-dim); }
.calc-card-body { padding: 24px; }

/* Form */
.form-group { margin-bottom: 16px; }
.form-label {
  display: flex; align-items: center; gap: 7px;
  font-size: 12px; font-weight: 600; color: var(--text-muted);
  margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.05em;
}
.form-label i { color: #06b6d4; font-size: 12px; }
body.light-theme .form-label i { color: #0891b2; }

/* ---- Datetime input row (with Now button) ---- */
.datetime-input-row { display: flex; gap: 8px; align-items: stretch; }
.datetime-input {
  flex: 1; padding: 11px 14px;
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-family: 'DM Sans', sans-serif; font-size: 14px; outline: none;
  appearance: none; -webkit-appearance: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  /* Ensure datetime picker arrows are visible in dark mode */
  color-scheme: dark;
}
body.light-theme .datetime-input { color-scheme: light; }
.datetime-input:hover { border-color: var(--border-hover); }
.datetime-input:focus {
  border-color: #06b6d4; box-shadow: 0 0 0 3px rgba(6,182,212,0.15); background: var(--surface);
}
body.light-theme .datetime-input:focus { border-color: #0891b2; box-shadow: 0 0 0 3px rgba(8,145,178,0.1); }
.datetime-input.error { border-color: var(--pink) !important; box-shadow: 0 0 0 3px var(--pink-dim) !important; }

/* Now button */
.now-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px; flex-shrink: 0;
  background: rgba(6,182,212,0.12); border: 1px solid rgba(6,182,212,0.25);
  border-radius: var(--radius-sm); color: #06b6d4; font-family: 'DM Sans', sans-serif;
  font-size: 13px; font-weight: 600; cursor: pointer; white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
body.light-theme .now-btn { background: rgba(8,145,178,0.08); border-color: rgba(8,145,178,0.2); color: #0891b2; }
.now-btn:hover { background: rgba(6,182,212,0.2); border-color: #06b6d4; transform: scale(1.02); }
body.light-theme .now-btn:hover { background: rgba(8,145,178,0.14); border-color: #0891b2; }
.now-btn:active { transform: scale(0.97); }

/* Segmented toggle */
.segmented-toggle {
  display: flex; background: var(--bg-3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 3px; gap: 3px;
}
.seg-opt {
  flex: 1; padding: 9px 10px; border: none; border-radius: calc(var(--radius-sm) - 2px);
  background: transparent; font-family: 'DM Sans', sans-serif; font-size: 13px; font-weight: 600;
  color: var(--text-muted); cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.seg-opt:hover { color: var(--text); }
.seg-add.active      { background: var(--surface); color: #06b6d4; box-shadow: 0 1px 4px rgba(0,0,0,0.12); }
.seg-subtract.active { background: var(--surface); color: #f87171; box-shadow: 0 1px 4px rgba(0,0,0,0.12); }
body.light-theme .seg-add.active      { color: #0891b2; }
body.light-theme .seg-subtract.active { color: #dc2626; }

.form-divider { height: 1px; background: var(--border); margin: 16px 0; }

.form-input {
  width: 100%; padding: 11px 14px; background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-family: 'DM Sans', sans-serif; font-size: 15px; outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  appearance: none; -webkit-appearance: none;
}
.form-input:hover { border-color: var(--border-hover); }
.form-input:focus {
  border-color: #06b6d4; box-shadow: 0 0 0 3px rgba(6,182,212,0.15); background: var(--surface);
}
body.light-theme .form-input:focus { border-color: #0891b2; box-shadow: 0 0 0 3px rgba(8,145,178,0.1); }
.form-input.error { border-color: var(--pink) !important; box-shadow: 0 0 0 3px var(--pink-dim) !important; }

.form-hint { display: flex; align-items: flex-start; gap: 6px; font-size: 12px; color: var(--text-dim); margin-top: 7px; line-height: 1.5; }
.form-hint i { color: #06b6d4; font-size: 11px; flex-shrink: 0; margin-top: 1px; }
body.light-theme .form-hint i { color: #0891b2; }

/* ============================================
   DURATION GRID — 4 columns with steppers
   ============================================ */
.duration-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.duration-field { display: flex; flex-direction: column; gap: 5px; }
.dur-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-dim); text-align: center;
}
.dur-input-wrap {
  display: flex; align-items: center; gap: 0;
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  overflow: hidden; transition: border-color var(--transition), box-shadow var(--transition);
}
.dur-input-wrap:focus-within {
  border-color: #06b6d4; box-shadow: 0 0 0 3px rgba(6,182,212,0.12);
}
body.light-theme .dur-input-wrap:focus-within { border-color: #0891b2; box-shadow: 0 0 0 3px rgba(8,145,178,0.08); }
.dur-step {
  flex-shrink: 0; width: 28px; height: 100%;
  background: transparent; border: none; color: var(--text-dim);
  font-size: 14px; font-weight: 700; cursor: pointer; padding: 0;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
}
.dur-step:hover { background: rgba(6,182,212,0.1); color: #06b6d4; }
body.light-theme .dur-step:hover { background: rgba(8,145,178,0.07); color: #0891b2; }
.dur-step:active { transform: scale(0.9); }
.dur-input {
  flex: 1; border: none !important; box-shadow: none !important;
  background: transparent; text-align: center;
  padding: 9px 2px; font-size: 16px; font-family: 'Bricolage Grotesque', sans-serif; font-weight: 700;
  color: var(--text); min-width: 0;
  border-radius: 0 !important;
  -moz-appearance: textfield; appearance: textfield;
}
.dur-input::-webkit-outer-spin-button,
.dur-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.hidden { display: none !important; }

/* Calculate button */
.calc-btn-primary {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 14px 20px; background: var(--accent); color: #0c0f1a;
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 16px; font-weight: 700;
  border: none; border-radius: var(--radius-sm); cursor: pointer; margin-top: 4px;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative; overflow: hidden;
}
body.light-theme .calc-btn-primary { color: #fff; }
.calc-btn-primary::after { content: ''; position: absolute; inset: 0; background: #000; opacity: 0; transition: opacity 0.15s; }
.calc-btn-primary:hover { box-shadow: 0 4px 20px var(--accent-glow); }
.calc-btn-primary:hover::after { opacity: 0.06; }
.calc-btn-primary:active { transform: scale(0.98); }

/* Error toast */
.calc-error {
  display: flex; align-items: center; gap: 10px; padding: 12px 16px;
  background: var(--pink-dim); border: 1px solid rgba(251,113,133,0.3);
  border-radius: var(--radius-sm); color: var(--pink); font-size: 14px; font-weight: 500;
  margin-top: 12px; opacity: 0; transform: translateY(-6px);
  transition: opacity 0.3s ease, transform 0.3s ease; pointer-events: none;
}
.calc-error.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* ============================================
   RESULT CARD
   ============================================ */
.result-card {
  margin-top: 20px; background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  display: none; opacity: 0; transform: translateY(8px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.result-card.show { display: block; opacity: 1; transform: translateY(0); }

/* Hero */
.result-hero {
  padding: 20px 24px 18px;
  background: linear-gradient(135deg, rgba(6,182,212,0.08) 0%, transparent 60%);
  border-bottom: 1px solid var(--border);
}
.result-hero-top {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px;
}
.result-hero-op {
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em;
  color: #06b6d4;
}
body.light-theme .result-hero-op { color: #0891b2; }
.copy-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 12px; background: transparent;
  border: 1px solid var(--border); border-radius: 100px;
  color: var(--text-dim); font-size: 12px; font-weight: 600; cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.copy-btn:hover { background: rgba(6,182,212,0.1); border-color: #06b6d4; color: #06b6d4; }
body.light-theme .copy-btn:hover { background: rgba(8,145,178,0.07); border-color: #0891b2; color: #0891b2; }
.copy-btn.copied { color: #10b981; border-color: #10b981; background: rgba(16,185,129,0.1); }

/* Main date/time */
.result-date-main {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 28px; font-weight: 800; letter-spacing: -0.8px; color: var(--text); line-height: 1.1;
}
.result-time-main {
  font-family: 'DM Mono', monospace; font-size: 20px; font-weight: 600;
  color: #06b6d4; margin-top: 4px; letter-spacing: -0.3px;
}
body.light-theme .result-time-main { color: #0891b2; }
.result-relative {
  margin-top: 8px; font-size: 13px; font-weight: 600; color: var(--text-muted);
  display: flex; align-items: center; gap: 6px;
}
.result-relative::before {
  content: ''; display: inline-block; width: 7px; height: 7px; border-radius: 50%;
  background: #06b6d4; flex-shrink: 0;
}
body.light-theme .result-relative::before { background: #0891b2; }

/* ============================================
   DURATION BREAKDOWN
   ============================================ */
.duration-breakdown {
  padding: 16px 24px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.breakdown-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-dim); margin-bottom: 14px;
}
.breakdown-title i { color: #06b6d4; }
body.light-theme .breakdown-title i { color: #0891b2; }
.breakdown-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--border); border-radius: 6px; overflow: hidden;
}
.breakdown-cell {
  background: var(--bg-2); padding: 12px 8px;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  transition: background var(--transition);
}
.breakdown-cell:hover { background: var(--bg-3); }
.breakdown-val {
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 20px; font-weight: 800;
  letter-spacing: -0.5px; color: var(--text);
}
.breakdown-label { font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-dim); }

/* ============================================
   FROM / TO CONNECTOR
   ============================================ */
.from-to-section {
  padding: 16px 24px; background: var(--surface);
}
.from-to-row { display: flex; align-items: center; gap: 14px; }
.from-to-icon {
  flex-shrink: 0; width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.from-icon { background: rgba(6,182,212,0.12); color: #06b6d4; border: 2px solid rgba(6,182,212,0.25); }
.to-icon   { background: rgba(16,185,129,0.12); color: #10b981; border: 2px solid rgba(16,185,129,0.25); }
body.light-theme .from-icon { background: rgba(8,145,178,0.08); color: #0891b2; }
.from-to-content { display: flex; flex-direction: column; gap: 2px; }
.from-to-label { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); }
.from-to-val { font-family: 'DM Mono', monospace; font-size: 13px; font-weight: 600; color: var(--text); }

.from-to-connector {
  display: flex; align-items: center; gap: 8px; padding: 8px 0 8px 9px;
}
.connector-line { flex: 1; height: 1px; background: var(--border); }
.connector-badge {
  flex-shrink: 0; padding: 3px 10px;
  background: rgba(6,182,212,0.1); border: 1px solid rgba(6,182,212,0.25);
  border-radius: 100px; font-family: 'DM Mono', monospace; font-size: 11px; font-weight: 700;
  color: #06b6d4; white-space: nowrap;
}
body.light-theme .connector-badge { background: rgba(8,145,178,0.07); border-color: rgba(8,145,178,0.2); color: #0891b2; }
/* Subtract style */
.connector-badge.subtract-badge {
  background: rgba(248,113,113,0.1); border-color: rgba(248,113,113,0.25); color: #f87171;
}
body.light-theme .connector-badge.subtract-badge { color: #dc2626; }

/* ============================================
   TOPIC CLUSTER
   ============================================ */
.topic-cluster-section {
  position: relative; z-index: 1;
  background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.topic-cluster-inner { max-width: 1320px; margin: 0 auto; padding: 56px 24px; }
.topic-cluster-header { max-width: 680px; margin-bottom: 40px; }
.topic-cluster-tag {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 12px 4px 8px; background: rgba(6,182,212,0.12); border: 1px solid rgba(6,182,212,0.22);
  border-radius: 100px; font-size: 12px; font-weight: 600; color: #06b6d4;
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 16px;
}
body.light-theme .topic-cluster-tag { background: rgba(8,145,178,0.07); border-color: rgba(8,145,178,0.2); color: #0891b2; }
.topic-cluster-header h2 { font-family: 'Bricolage Grotesque', sans-serif; font-size: clamp(22px,2.5vw,30px); font-weight: 800; letter-spacing: -0.8px; color: var(--text); margin-bottom: 12px; }
.topic-cluster-header p { font-size: 15px; line-height: 1.75; color: var(--text-muted); }
.cluster-grid { display: grid; grid-template-columns: 280px 1fr; gap: 24px; margin-bottom: 40px; align-items: start; }
.cluster-primary { background: var(--surface); border: 2px solid #06b6d4; border-radius: var(--radius); padding: 22px; position: relative; }
body.light-theme .cluster-primary { border-color: #0891b2; }
.cluster-primary::before { content: ''; position: absolute; inset: 0; border-radius: inherit; background: linear-gradient(135deg, rgba(6,182,212,0.07) 0%, transparent 60%); pointer-events: none; }
.cluster-primary-label { display: inline-flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: #06b6d4; margin-bottom: 10px; }
body.light-theme .cluster-primary-label { color: #0891b2; }
.cluster-primary h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 18px; font-weight: 700; color: var(--text); margin-bottom: 8px; position: relative; }
.cluster-primary p { font-size: 13px; line-height: 1.65; color: var(--text-muted); margin-bottom: 14px; position: relative; }
.cluster-keywords { display: flex; flex-wrap: wrap; gap: 6px; position: relative; }
.cluster-keywords span { padding: 3px 9px; background: rgba(6,182,212,0.1); border: 1px solid rgba(6,182,212,0.2); border-radius: 100px; font-size: 11px; font-weight: 600; color: #06b6d4; }
body.light-theme .cluster-keywords span { background: rgba(8,145,178,0.07); border-color: rgba(8,145,178,0.18); color: #0891b2; }
.cluster-links { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.cluster-links h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 14px; font-weight: 700; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.06em; padding: 14px 20px; border-bottom: 1px solid var(--border); background: var(--bg-3); }
.cluster-link-list { display: flex; flex-direction: column; }
.cluster-link-item { display: flex; align-items: center; gap: 14px; padding: 14px 20px; border-bottom: 1px solid var(--border); transition: background var(--transition); }
.cluster-link-item:last-child { border-bottom: none; }
.cluster-link-item:hover { background: var(--bg-3); }
.cluster-link-icon { flex-shrink: 0; width: 34px; height: 34px; border-radius: 8px; background: rgba(6,182,212,0.1); display: flex; align-items: center; justify-content: center; font-size: 15px; color: #06b6d4; }
body.light-theme .cluster-link-icon { background: rgba(8,145,178,0.07); color: #0891b2; }
.cluster-link-text { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.cluster-link-text strong { font-size: 14px; font-weight: 600; color: var(--text); }
.cluster-link-text span { font-size: 12px; color: var(--text-dim); }
.cluster-link-arrow { color: var(--text-dim); font-size: 12px; transition: transform var(--transition), color var(--transition); }
.cluster-link-item:hover .cluster-link-arrow { transform: translateX(3px); color: #06b6d4; }
body.light-theme .cluster-link-item:hover .cluster-link-arrow { color: #0891b2; }
.cluster-link-all { background: var(--bg-2); }
.cluster-crosslinks { padding-top: 32px; border-top: 1px solid var(--border); }
.cluster-crosslinks h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 18px; font-weight: 700; letter-spacing: -0.3px; color: var(--text); margin-bottom: 6px; }
.cluster-crosslinks > p { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; }
.crosslink-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.crosslink-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 16px; display: flex; flex-direction: column; gap: 8px; transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition); }
.crosslink-card:hover { border-color: #06b6d4; transform: translateY(-3px); box-shadow: var(--shadow); }
body.light-theme .crosslink-card:hover { border-color: #0891b2; }
.crosslink-card i { font-size: 20px; color: #06b6d4; }
body.light-theme .crosslink-card i { color: #0891b2; }
.crosslink-card strong { font-family: 'Bricolage Grotesque', sans-serif; font-size: 14px; font-weight: 700; color: var(--text); }
.crosslink-card span { font-size: 12px; line-height: 1.5; color: var(--text-dim); }

/* Ad slot */
.ad-slot { position: relative; z-index: 1; max-width: 1320px; margin: 0 auto; padding: 0 24px 40px; }
.ad-slot > div { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }

/* Fade-up */
.fade-up { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .calc-page { grid-template-columns: 1fr; padding: 32px 20px 60px; gap: 32px; }
  .calc-page-info { position: static; }
  .calc-panel { position: static; order: 2; }
  .calc-page-content { order: 3; }
  .cluster-grid { grid-template-columns: 1fr; }
  .crosslink-grid { grid-template-columns: 1fr 1fr; }
  .usecase-grid { grid-template-columns: 1fr 1fr; }
  .tips-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .calc-page { padding: 24px 16px 48px; gap: 24px; }
  .duration-grid { grid-template-columns: 1fr 1fr; }
  .breakdown-grid { grid-template-columns: 1fr 1fr; }
  .usecase-grid { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .crosslink-grid { grid-template-columns: 1fr; }
  .result-date-main { font-size: 22px; }
  .result-time-main { font-size: 18px; }
  .topic-cluster-inner { padding: 36px 16px; }
}

@media (min-width: 1025px) {
  .calc-page-info {
    grid-row: 1 / 2;
    grid-column: 1 / 2;
  }
  .calc-page-content {
    grid-row: 2 / 3;
    grid-column: 1 / 2;
  }
  .calc-panel {
    grid-row: 1 / 3;
    grid-column: 2 / 3;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}