/* ============================================================
   calc01 — Shared Design System  v2.0
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&family=DM+Serif+Display:ital@0;1&display=swap');

/* ── CSS Variables ── */
:root {
  --primary:        #0B4F6C;
  --primary-light:  #1A7FA8;
  --primary-pale:   #E8F4F8;
  --accent:         #F4845F;
  --accent-light:   #FDF0EB;
  --success:        #2E7D5E;
  --success-light:  #E8F5EF;
  --danger:         #C0392B;
  --danger-light:   #FDECEA;
  --warning:        #D4881A;
  --warning-light:  #FEF6E8;
  --text-primary:   #1A1A2E;
  --text-secondary: #5A6478;
  --text-muted:     #9AA3B0;
  --border:         #DDE3EC;
  --border-focus:   #1A7FA8;
  --bg:             #F7F9FC;
  --bg-card:        #FFFFFF;
  --bg-input:       #FFFFFF;
  --shadow-sm:      0 1px 3px rgba(0,0,0,0.06);
  --shadow-md:      0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg:      0 8px 32px rgba(0,0,0,0.10);
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      16px;
  --radius-xl:      24px;
  --font-display:   'DM Serif Display', serif;
  --font-body:      'DM Sans', sans-serif;
  --transition:     0.2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.calc-wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

.calc-header {
  padding: 40px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.calc-header h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--primary);
  line-height: 1.2;
}

.calc-header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.header-actions {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.calc-body {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 28px;
  align-items: start;
}

@media (max-width: 960px) {
  .calc-body { grid-template-columns: 1fr; }
}

/* ── Sticky left panel on desktop ── */
@media (min-width: 961px) {
  .calc-body aside {
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
  }
  .calc-body aside::-webkit-scrollbar { width: 4px; }
  .calc-body aside::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card-header {
  padding: 18px 24px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-header h2 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  flex: 1;
}

.card-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--primary-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}

.card-body { padding: 20px 24px; }

/* ── City Preset Bar ── */
.preset-bar {
  margin-bottom: 4px;
}

.preset-market-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.market-tab {
  padding: 5px 14px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition);
}

.market-tab:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.market-tab.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.preset-city-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.preset-city-row select {
  flex: 1;
  height: 36px;
  font-size: 0.85rem;
}

.btn-apply-preset {
  height: 36px;
  padding: 0 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}

.btn-apply-preset:hover { background: var(--primary-light); }

/* ── Input Sections (Accordion on mobile, flat on desktop) ── */
.input-section { margin-bottom: 0; }

.input-section + .input-section {
  border-top: 1px solid var(--border);
  padding-top: 0;
  margin-top: 0;
}

/* Accordion header — always clickable on mobile, header only */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0 4px;
  cursor: pointer;
  user-select: none;
}

.section-label {
  font-size: 0.73rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-muted);
}

.section-chevron {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform var(--transition);
  font-size: 10px;
}

.section-body {
  padding-bottom: 4px;
}

/* Desktop: always show all section bodies */
@media (min-width: 961px) {
  .section-chevron { display: none; }
  .section-body { display: block !important; }
  .section-header { cursor: default; padding-top: 12px; }
}

/* Mobile accordion */
@media (max-width: 960px) {
  .section-body { display: none; }
  .accordion-section.open .section-body { display: block; }
  .accordion-section.open .section-chevron { transform: rotate(180deg); }
}

.field { margin-bottom: 14px; }

.field label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
  gap: 6px;
}

.field label span.val-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: auto;
}

/* ── Tooltip trigger ── */
.tip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--border);
  color: var(--text-secondary);
  font-size: 10px;
  font-weight: 700;
  cursor: help;
  flex-shrink: 0;
  transition: background var(--transition);
  line-height: 1;
}

.tip-icon:hover { background: var(--primary-light); color: #fff; }

/* ── Tooltip popup ── */
.calc-tooltip {
  position: absolute;
  z-index: 9999;
  background: #1A1A2E;
  color: rgba(255,255,255,0.90);
  font-family: var(--font-body);
  font-size: 0.8rem;
  line-height: 1.5;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.calc-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Text Inputs ── */
.input-currency-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-currency-wrap .currency-symbol {
  position: absolute;
  left: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  pointer-events: none;
  z-index: 1;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.input-currency-wrap input { padding-left: 28px; }

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(26,127,168,0.12);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235A6478' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}

/* ── Slider Fields ── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  border: none;
  padding: 0;
  box-shadow: none;
  cursor: pointer;
  min-width: 0;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: 2.5px solid white;
  box-shadow: 0 1px 6px rgba(0,0,0,0.25);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.slider-row input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 2px 10px rgba(11,79,108,0.35);
}

.slider-row input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: 2.5px solid white;
  box-shadow: 0 1px 6px rgba(0,0,0,0.25);
  cursor: pointer;
}

.slider-value {
  min-width: 56px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-pale);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-light); border-color: var(--primary-light); }

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-pale); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover { background: var(--bg); color: var(--primary); }

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: #1A1A2E;
  color: #fff;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 9999;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ── Results Panel ── */
.results-panel { display: flex; flex-direction: column; gap: 24px; }

/* ── Summary Cards ── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

@media (max-width: 700px) {
  .summary-grid { grid-template-columns: 1fr 1fr; }
}

.summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), background var(--transition);
}

.summary-card.highlight-buy {
  border-color: var(--success);
  background: var(--success-light);
}

.summary-card.highlight-rent {
  border-color: var(--accent);
  background: var(--accent-light);
}

.summary-card .card-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.summary-card .card-value {
  font-family: var(--font-display);
  font-size: 1.55rem;
  color: var(--primary);
  line-height: 1.1;
  word-break: break-word;
}

.summary-card .card-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.summary-card.highlight-buy .card-value { color: var(--success); }
.summary-card.highlight-rent .card-value { color: var(--accent); }

/* ── Verdict Narrative ── */
.verdict-narrative {
  background: var(--primary-pale);
  border: 1px solid rgba(11,79,108,0.15);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.7;
}

.verdict-narrative strong { color: var(--primary); }
.verdict-narrative.buy-wins { border-left-color: var(--success); background: var(--success-light); }
.verdict-narrative.rent-wins { border-left-color: var(--accent); background: var(--accent-light); }
.verdict-narrative.buy-wins strong { color: var(--success); }
.verdict-narrative.rent-wins strong { color: var(--accent); }

/* ── PV/NPV/FV Table ── */
.pv-table-wrap { overflow-x: auto; }

table.pv-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

table.pv-table thead th {
  background: var(--primary-pale);
  color: var(--primary);
  font-weight: 600;
  padding: 10px 14px;
  text-align: right;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

table.pv-table thead th:first-child { text-align: left; }

table.pv-table tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  color: var(--text-primary);
  white-space: nowrap;
}

table.pv-table tbody td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--text-secondary);
}

table.pv-table tbody tr:last-child td { border-bottom: none; }
table.pv-table tbody tr:hover td { background: var(--bg); }

.positive { color: var(--success) !important; font-weight: 600; }
.negative { color: var(--danger) !important; font-weight: 600; }

/* ── Charts ── */
.chart-wrap {
  position: relative;
  width: 100%;
}

.chart-wrap canvas { width: 100% !important; }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  width: 12px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Formula Section ── */
.formula-section { font-size: 0.875rem; }

.formula-block {
  margin-bottom: 22px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.formula-block:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.formula-block h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.formula-block .formula {
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  background: var(--primary-pale);
  color: var(--primary);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary-light);
  margin: 8px 0;
  overflow-x: auto;
  white-space: pre;
}

.formula-block p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.85rem;
}

.formula-block ul { list-style: none; margin-top: 6px; }

.formula-block ul li {
  padding: 2px 0;
  color: var(--text-secondary);
  font-size: 0.84rem;
}

.formula-block ul li::before {
  content: "→ ";
  color: var(--primary-light);
  font-weight: 600;
}

/* ── Loading / Spinner ── */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
  flex-shrink: 0;
}

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

/* ── Forex bar ── */
.forex-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--primary-pale);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--primary);
  margin-bottom: 16px;
}

/* ── Utility ── */
.text-right   { text-align: right; }
.mt-4         { margin-top: 4px; }
.mt-8         { margin-top: 8px; }
.mt-16        { margin-top: 16px; }
.mb-4         { margin-bottom: 4px; }
.mb-8         { margin-bottom: 8px; }
.mb-16        { margin-bottom: 16px; }
.flex         { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-8        { gap: 8px; }
.w-full       { width: 100%; }
.text-muted   { color: var(--text-muted); font-size: 0.82rem; }
.divider      { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ── Print / PDF ── */
@media print {
  .calc-body { grid-template-columns: 1fr; }
  aside { display: none; }
  .header-actions { display: none; }
  .preset-bar { display: none; }
  .card { box-shadow: none; break-inside: avoid; }
  .results-panel { gap: 16px; }
}