/* ===== Design Tokens ===== */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-border: rgba(59, 130, 246, 0.12);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --bg-input: rgba(15, 23, 42, 0.8);
  --bg-input-focus: rgba(30, 41, 59, 0.9);
  --bg-disabled: rgba(30, 41, 59, 0.4);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-disabled: #475569;

  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --accent-light: #60a5fa;
  --accent-dark: #2563eb;
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);
  --warning: #f59e0b;
  --danger: #ef4444;

  --border: rgba(71, 85, 105, 0.4);
  --border-focus: rgba(59, 130, 246, 0.6);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--accent-glow);

  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(16, 185, 129, 0.05) 0%, transparent 60%);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.app-header {
  background: rgba(17, 24, 39, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 0 20px var(--accent-glow);
}

.logo-icon svg {
  width: 22px;
  height: 22px;
}

.logo h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.badge {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* ===== Info Banner ===== */
.info-banner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin: 24px 0 16px;
  animation: fadeSlideIn 0.5s ease;
}

.info-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.info-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
}

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

.info-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px;
  transition: color var(--transition);
}

.info-close:hover {
  color: var(--text-primary);
}

/* ===== Steps Indicator ===== */
.steps-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 24px 0 28px;
}

.step {
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0.4;
  transition: opacity var(--transition-slow);
}

.step.active {
  opacity: 1;
}

.step.completed {
  opacity: 0.8;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  transition: all var(--transition-slow);
}

.step.active .step-number {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.step.completed .step-number {
  background: var(--success);
  border-color: var(--success);
}

.step-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.step.active .step-label {
  color: var(--text-primary);
}

.step-line {
  width: 60px;
  height: 2px;
  background: var(--border);
  margin: 0 8px;
}

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(16px);
  margin-bottom: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  animation: fadeSlideIn 0.5s ease;
}

.card-header {
  padding: 24px 28px 0;
}

.card-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-icon {
  font-size: 1.3rem;
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.card-body {
  padding: 20px 28px 28px;
}

/* ===== Forms ===== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.required {
  color: var(--danger);
}

.form-group input,
.form-group select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  outline: none;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* Calculated / disabled fields */
.form-group.calculated input {
  background: var(--bg-disabled);
  border-color: transparent;
  color: var(--text-disabled);
  cursor: not-allowed;
  font-weight: 600;
}

.form-group.calculated label {
  color: var(--text-muted);
}

/* Validation states */
.form-group.error input,
.form-group.error select {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-group.error label {
  color: var(--danger);
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

.subsection-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.auto-badge {
  background: rgba(71, 85, 105, 0.3);
  color: var(--text-muted);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 500;
}

/* ===== Swap Rates ===== */
.swap-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.swap-column {
  background: rgba(15, 23, 42, 0.5);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
}

.swap-column-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.swap-column-header.drawdown {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), transparent);
}

.swap-column-header.repayment {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), transparent);
}

.swap-column-header h3 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.swap-date-label {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.swap-rates-list {
  padding: 12px;
}

.swap-rate-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px;
}

.swap-rate-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  min-width: 70px;
}

.swap-rate-row input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  width: 90px;
  text-align: right;
  outline: none;
  transition: all var(--transition);
}

.swap-rate-row input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.swap-rate-row input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.swap-rate-unit {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ===== Calculate Button ===== */
.calculate-section {
  text-align: center;
  margin: 8px 0 28px;
}

.btn-calculate {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  padding: 14px 48px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-calculate:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--accent-glow);
}

.btn-calculate:active {
  transform: translateY(0);
}

.btn-icon {
  font-size: 1.1rem;
}

.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  margin-top: 14px;
  color: var(--danger);
  font-size: 0.85rem;
  display: inline-block;
  max-width: 600px;
  text-align: left;
}

/* ===== Results ===== */
.results-card {
  border-color: rgba(16, 185, 129, 0.2);
  animation: resultFadeIn 0.6s ease;
}

.results-header {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), transparent);
}

.result-hero {
  text-align: center;
  padding: 32px 0 28px;
}

.result-amount {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--success), #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.result-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.result-summary {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

.summary-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  text-align: center;
}

.summary-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.summary-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.summary-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Breakdown Tables ===== */
.breakdown-section {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.breakdown-toggle {
  padding: 14px 18px;
  background: rgba(15, 23, 42, 0.5);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background var(--transition);
}

.breakdown-toggle:hover {
  background: rgba(15, 23, 42, 0.8);
}

.breakdown-toggle::-webkit-details-marker {
  display: none;
}

.breakdown-toggle::after {
  content: '▸';
  margin-left: auto;
  transition: transform var(--transition);
}

details[open] .breakdown-toggle::after {
  transform: rotate(90deg);
}

.table-wrapper {
  overflow-x: auto;
  padding: 0 4px 4px;
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  white-space: nowrap;
}

.breakdown-table th {
  background: rgba(15, 23, 42, 0.8);
  padding: 10px 12px;
  text-align: right;
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}

.breakdown-table th:first-child,
.breakdown-table td:first-child {
  text-align: left;
}

.breakdown-table td {
  padding: 8px 12px;
  text-align: right;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(71, 85, 105, 0.2);
  font-variant-numeric: tabular-nums;
}

.breakdown-table tbody tr:hover {
  background: rgba(59, 130, 246, 0.05);
}

.breakdown-table tfoot td {
  background: rgba(15, 23, 42, 0.6);
  font-weight: 700;
  color: var(--text-primary);
  border-top: 2px solid var(--border);
}

.breakdown-table.compact th,
.breakdown-table.compact td {
  padding: 6px 10px;
}

.text-right {
  text-align: right !important;
}

/* ===== Disclaimer ===== */
.disclaimer {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 12px 0 40px;
  line-height: 1.6;
}

/* ===== Footer ===== */
.app-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== Animations ===== */
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes resultFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ===== Responsive ===== */
@media (max-width: 700px) {
  .form-grid {
    grid-template-columns: 1fr;
  }

  .swap-columns {
    grid-template-columns: 1fr;
  }

  .result-summary {
    grid-template-columns: 1fr;
  }

  .result-amount {
    font-size: 2.4rem;
  }

  .card-body {
    padding: 16px 18px 22px;
  }

  .card-header {
    padding: 18px 18px 0;
  }

  .steps-indicator {
    gap: 0;
  }

  .step-label {
    display: none;
  }

  .step-line {
    width: 40px;
  }

  .header-content {
    gap: 12px;
  }
}