/* ========== CSS Variables ========== */
:root {
  --primary: #1a5276;
  --primary-light: #2980b9;
  --primary-bg: #eaf2f8;
  --accent: #c0392b;
  --accent-light: #fdecea;
  --success: #27ae60;
  --success-light: #eafaf1;
  --warning: #f39c12;
  --bg: #f0f3f7;
  --card-bg: #ffffff;
  --text: #2c3e50;
  --text-light: #7f8c8d;
  --border: #dce1e8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ========== Layout ========== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ========== Header ========== */
header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  padding: 32px 0;
  text-align: center;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 4px;
}

header .subtitle {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* ========== Cards ========== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 20px;
}

.card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-bg);
  color: var(--primary);
}

.card h2 .en {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-left: 8px;
}

/* ========== Input Grid (2-col on desktop) ========== */
.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

@media (max-width: 768px) {
  .input-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== Form Elements ========== */
.form-group {
  margin-bottom: 20px;
}

.form-group > label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: var(--text);
}

.form-group > label .en {
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--text-light);
  margin-left: 6px;
}

.input-field {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  transition: border-color var(--transition);
  background: #fff;
}

.input-field:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.12);
}

.input-with-prefix {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}

.input-with-prefix:focus-within {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.12);
}

.input-with-prefix .prefix {
  padding: 10px 14px;
  background: var(--bg);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-light);
  border-right: 1.5px solid var(--border);
  white-space: nowrap;
}

.input-with-prefix .input-field {
  border: none;
  border-radius: 0;
  box-shadow: none;
}

.input-with-prefix .input-field:focus {
  box-shadow: none;
}

.hint {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 6px;
}

.section-hint {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 16px;
  margin-top: -12px;
}

/* ========== Radio Button Group ========== */
.radio-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.radio-btn {
  position: relative;
  cursor: pointer;
}

.radio-btn input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-btn span {
  display: inline-block;
  padding: 8px 18px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text);
  transition: all var(--transition);
  user-select: none;
}

.radio-btn input:checked + span {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.radio-btn:hover span {
  border-color: var(--primary-light);
}

/* ========== Info Badges ========== */
.info-badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.badge {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
}

#absd-badge {
  background: var(--accent-light);
  color: var(--accent);
}

#ltv-badge {
  background: var(--primary-bg);
  color: var(--primary);
}

/* ========== Derived Info ========== */
.derived-info {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 8px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.9rem;
}

.info-row .value {
  font-weight: 600;
  color: var(--primary);
}

/* ========== Bank Rows ========== */
.bank-row {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1.2fr 0.8fr auto;
  gap: 12px;
  align-items: end;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.bank-row .form-group {
  margin-bottom: 0;
}

.bank-row .form-group > label {
  font-size: 0.78rem;
  margin-bottom: 4px;
}

.bank-row .input-field {
  padding: 8px 12px;
  font-size: 0.9rem;
}

.btn-remove {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--accent);
  font-size: 1.3rem;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  margin-bottom: 2px;
}

.btn-remove:hover {
  background: var(--accent-light);
}

@media (max-width: 768px) {
  .bank-row {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .bank-row .form-group:first-child {
    grid-column: 1 / -1;
  }

  .btn-remove {
    grid-column: 1 / -1;
    justify-self: end;
  }
}

/* ========== Buttons ========== */
.btn {
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  box-shadow: 0 4px 12px rgba(26, 82, 118, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(26, 82, 118, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px dashed var(--border);
  width: 100%;
  padding: 10px;
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-light);
}

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

.action-bar {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin: 28px 0;
}

/* ========== Results ========== */
.result-card {
  animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.hidden {
  display: none;
}

/* ========== Result Tables ========== */
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.result-table th,
.result-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.result-table th {
  background: var(--bg);
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

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

.result-table .total-row {
  font-weight: 700;
  background: var(--primary-bg);
}

.result-table .total-row td {
  color: var(--primary);
  border-top: 2px solid var(--primary);
}

.result-table .highlight {
  color: var(--accent);
  font-weight: 600;
}

.result-table .best {
  background: var(--success-light);
  color: var(--success);
  font-weight: 700;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ========== Cost Bars ========== */
.cost-bar-group {
  margin: 16px 0;
}

.cost-bar-row {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
  gap: 12px;
}

.cost-bar-label {
  width: 120px;
  font-size: 0.85rem;
  text-align: right;
  flex-shrink: 0;
}

.cost-bar-track {
  flex: 1;
  height: 24px;
  background: var(--bg);
  border-radius: 12px;
  overflow: hidden;
}

.cost-bar-fill {
  height: 100%;
  border-radius: 12px;
  transition: width 0.6s ease;
}

.cost-bar-value {
  width: 140px;
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* ========== Summary Box ========== */
.summary-box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 16px 0;
}

.summary-item {
  background: var(--bg);
  padding: 20px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.summary-item .label {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 6px;
}

.summary-item .amount {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
}

.summary-item.warning .amount {
  color: var(--accent);
}

/* ========== Accordion (for amortization) ========== */
.accordion {
  margin-bottom: 12px;
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  user-select: none;
  transition: background var(--transition);
}

.accordion-header:hover {
  background: var(--primary-bg);
}

.accordion-header .arrow {
  transition: transform var(--transition);
  font-size: 0.8rem;
}

.accordion.open .accordion-header .arrow {
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.accordion.open .accordion-body {
  max-height: 5000px;
}

.accordion-body .result-table {
  font-size: 0.82rem;
}

.accordion-body .result-table th,
.accordion-body .result-table td {
  padding: 8px 10px;
}

/* ========== TDSR Info ========== */
.tdsr-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--primary-bg);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--primary);
}

.tdsr-card .icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.tdsr-card .tdsr-text {
  font-size: 0.9rem;
  line-height: 1.5;
}

.tdsr-card .tdsr-text strong {
  color: var(--primary);
}

/* ========== Footer ========== */
footer {
  margin-top: 40px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

.disclaimer {
  font-size: 0.78rem;
  color: var(--text-light);
  text-align: center;
  line-height: 1.6;
}

/* ========== Validation Error ========== */
.input-field.error {
  border-color: var(--accent);
}

.error-msg {
  color: var(--accent);
  font-size: 0.78rem;
  margin-top: 4px;
}

/* ========== Print Styles ========== */
@media print {
  body { background: #fff; }
  header { background: none; color: var(--text); padding: 16px 0; }
  .card { box-shadow: none; border: 1px solid #ddd; }
  .action-bar, #btn-add-bank, .btn-remove { display: none; }
  .hidden { display: block !important; }
  .accordion-body { max-height: none !important; }
  footer { margin-top: 20px; }
}