/* ===== CARD ===== */
.card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }
.card-sm { padding: var(--space-4); border-radius: var(--r-md); }
.card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--c-text);
}
.card-title .icon {
  width: 28px; height: 28px;
  background: var(--c-primary-l);
  color: var(--c-primary);
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.875rem;
  flex-shrink: 0;
}

/* ===== CALC CARD (homepage) ===== */
.calc-card {
  display: block;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--space-5);
  text-decoration: none;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.calc-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-color, var(--c-primary));
  transform: scaleX(0);
  transition: transform var(--transition);
  transform-origin: left;
}
.calc-card:hover { border-color: var(--card-color, var(--c-primary)); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.calc-card:hover::before { transform: scaleX(1); }

.calc-card-icon {
  width: 48px; height: 48px;
  background: rgba(37, 99, 235, 0.15);
  background: color-mix(in srgb, var(--card-color, var(--c-primary)) 15%, transparent);
  color: var(--card-color, var(--c-primary));
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: var(--space-4);
}
.calc-card h3 { font-size: 1rem; font-weight: 700; color: var(--c-text); margin-bottom: var(--space-2); }
.calc-card p { font-size: 0.875rem; color: var(--c-text3); margin-bottom: var(--space-4); line-height: 1.5; }
.calc-card-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--card-color, var(--c-primary));
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-5);
  height: 44px;
  border-radius: var(--r-md);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
  font-family: var(--font);
  line-height: 1;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--c-primary);
  color: white;
  border-color: var(--c-primary);
}
.btn-primary:hover { background: var(--c-primary-h); border-color: var(--c-primary-h); }

.btn-secondary {
  background: var(--c-bg2);
  color: var(--c-text2);
  border-color: var(--c-border);
}
.btn-secondary:hover { background: var(--c-bg3); border-color: var(--c-border2); }

.btn-success {
  background: var(--c-accent);
  color: white;
  border-color: var(--c-accent);
}
.btn-success:hover { background: #059669; border-color: #059669; }

.btn-outline {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}
.btn-outline:hover { background: var(--c-primary-l); }

.btn-danger {
  background: var(--c-danger);
  color: white;
  border-color: var(--c-danger);
}

.btn-sm { height: 36px; padding: 0 var(--space-4); font-size: 0.875rem; }
.btn-lg { height: 52px; padding: 0 var(--space-8); font-size: 1rem; }
.btn-full { width: 100%; }
.btn-icon { width: 44px; height: 44px; padding: 0; }
.btn-icon.btn-sm { width: 36px; height: 36px; }

/* ===== INPUTS ===== */
.form-group { margin-bottom: var(--space-5); }
.form-row {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.form-row-2 { grid-template-columns: 1fr 1fr; }
.form-row-3 { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 480px) {
  .form-row-2, .form-row-3 { grid-template-columns: 1fr; }
}

.form-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text2);
}
.form-label .label-value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-primary);
  font-size: 0.9rem;
}
.form-label .tooltip-icon {
  width: 16px; height: 16px;
  background: var(--c-bg3);
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.65rem;
  color: var(--c-text3);
  cursor: help;
  margin-left: var(--space-1);
  flex-shrink: 0;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-prefix, .input-suffix {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  color: var(--c-text3);
  font-size: 0.9rem;
  font-weight: 500;
  pointer-events: none;
  z-index: 1;
}
.input-prefix { left: 14px; }
.input-suffix { right: 14px; }

.form-input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  font-size: 1rem;
  color: var(--c-text);
  font-family: var(--font);
  transition: all var(--transition);
  -webkit-appearance: none;
  appearance: none;
}
.form-input:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.form-input::placeholder { color: var(--c-text3); }
.has-prefix .form-input { padding-left: 34px; }
.has-suffix .form-input { padding-right: 34px; }

.form-select {
  width: 100%;
  height: 44px;
  padding: 0 36px 0 14px;
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  font-size: 1rem;
  color: var(--c-text);
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%2364748B' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}
.form-select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

/* Range Slider */
.range-wrap { display: flex; flex-direction: column; gap: var(--space-2); }
.form-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--c-border);
  border-radius: var(--r-full);
  outline: none;
  cursor: pointer;
}
.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--c-primary);
  cursor: pointer;
  border: 3px solid white;
  box-shadow: 0 0 0 1px var(--c-primary), var(--shadow-sm);
  transition: all var(--transition);
}
.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}
.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--c-text3);
}

/* ===== RESULTS ===== */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.result-metric {
  text-align: center;
  padding: var(--space-4);
  background: var(--c-bg2);
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
}
.result-metric.highlight {
  background: var(--c-primary);
  border-color: var(--c-primary);
}
.result-metric.highlight .metric-label { color: rgba(255,255,255,0.8); }
.result-metric.highlight .metric-value { color: white; }
.result-metric.success {
  background: rgba(16, 185, 129, 0.12);
  background: color-mix(in srgb, var(--c-accent) 12%, transparent);
  border-color: rgba(16, 185, 129, 0.30);
  border-color: color-mix(in srgb, var(--c-accent) 30%, transparent);
}
.result-metric.danger {
  background: rgba(239, 68, 68, 0.10);
  background: color-mix(in srgb, var(--c-danger) 10%, transparent);
  border-color: rgba(239, 68, 68, 0.25);
  border-color: color-mix(in srgb, var(--c-danger) 25%, transparent);
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--c-text3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}
.metric-value {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-text);
  font-family: var(--font-mono);
  line-height: 1.2;
}
.metric-sub {
  font-size: 0.75rem;
  color: var(--c-text3);
  margin-top: var(--space-1);
}

.result-highlight {
  background: linear-gradient(135deg, var(--c-primary) 0%, #1E40AF 100%);
  border-radius: var(--r-lg);
  padding: var(--space-6);
  text-align: center;
  color: white;
  margin-bottom: var(--space-5);
}
.result-highlight .main-label { font-size: 0.875rem; opacity: 0.8; margin-bottom: var(--space-2); }
.result-highlight .main-value { font-size: 2.25rem; font-weight: 900; font-family: var(--font-mono); }
.result-highlight .main-sub { font-size: 0.875rem; opacity: 0.75; margin-top: var(--space-2); }

/* ===== CHARTS ===== */
.chart-container {
  width: 100%;
  padding: var(--space-4) 0;
}
.chart-container svg {
  width: 100%;
  height: auto;
  display: block;
}
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  margin-top: var(--space-4);
  justify-content: center;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--c-text2);
}
.legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ===== ACTIONS ===== */
.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.calc-actions .btn-primary { flex: 1; min-width: 120px; }

/* ===== TABLE ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.data-table thead tr {
  background: var(--c-bg2);
  border-bottom: 2px solid var(--c-border);
}
.data-table th {
  padding: var(--space-3) var(--space-4);
  text-align: right;
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text3);
  white-space: nowrap;
}
.data-table th:first-child { text-align: left; }
.data-table td {
  padding: var(--space-3) var(--space-4);
  text-align: right;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
.data-table td:first-child { text-align: left; font-family: var(--font); color: var(--c-text); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--c-bg2); }
.data-table tfoot tr {
  background: var(--c-bg2);
  border-top: 2px solid var(--c-border);
}
.data-table tfoot td { font-weight: 700; color: var(--c-text); }

/* Collapsible section */
.section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: var(--space-5) var(--space-6);
  margin: 0 calc(-1 * var(--space-6)) calc(-1 * var(--space-6));
  border-top: 1px solid var(--c-border);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text2);
  transition: color var(--transition);
  user-select: none;
}
.section-toggle:hover { color: var(--c-primary); }
.toggle-icon { transition: transform var(--transition); }
.section-toggle.open .toggle-icon { transform: rotate(180deg); }
.collapsible-content { display: none; margin-top: var(--space-5); }
.collapsible-content.open { display: block; }

/* ===== BADGE / PILL ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--r-full);
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-success {
  background: rgba(16, 185, 129, 0.15);
  background: color-mix(in srgb, var(--c-accent) 15%, transparent);
  color: var(--c-accent);
}
.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  background: color-mix(in srgb, var(--c-warning) 15%, transparent);
  color: var(--c-warning);
}
.badge-danger {
  background: rgba(239, 68, 68, 0.12);
  background: color-mix(in srgb, var(--c-danger) 12%, transparent);
  color: var(--c-danger);
}
.badge-primary { background: var(--c-primary-l); color: var(--c-primary); }
.badge-neutral { background: var(--c-bg3); color: var(--c-text3); }

/* ===== TOAST / SNACKBAR ===== */
#toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--c-text);
  color: var(--c-bg);
  border-radius: var(--r-md);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.3s ease;
  max-width: 360px;
}
.toast.success { background: var(--c-accent); color: white; }
.toast.error { background: var(--c-danger); color: white; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== DIVIDER ===== */
.divider {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: var(--space-5) 0;
}

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 2px solid var(--c-border);
  margin-bottom: var(--space-5);
}
.tab-btn {
  padding: var(--space-3) var(--space-4);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text3);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
  font-family: var(--font);
}
.tab-btn.active { color: var(--c-primary); border-bottom-color: var(--c-primary); }
.tab-btn:hover { color: var(--c-text); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== ALERT ===== */
.alert {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--r-md);
  border: 1px solid;
  font-size: 0.9rem;
}
.alert-info {
  background: var(--c-primary-l);
  border-color: rgba(37, 99, 235, 0.30);
  border-color: color-mix(in srgb, var(--c-primary) 30%, transparent);
  color: var(--c-primary);
}
.alert-success {
  background: rgba(16, 185, 129, 0.10);
  background: color-mix(in srgb, var(--c-accent) 10%, transparent);
  border-color: rgba(16, 185, 129, 0.30);
  border-color: color-mix(in srgb, var(--c-accent) 30%, transparent);
  color: #065f46;
}
.alert-warning {
  background: rgba(245, 158, 11, 0.10);
  background: color-mix(in srgb, var(--c-warning) 10%, transparent);
  border-color: rgba(245, 158, 11, 0.30);
  border-color: color-mix(in srgb, var(--c-warning) 30%, transparent);
  color: #92400e;
}
.alert-danger {
  background: rgba(239, 68, 68, 0.08);
  background: color-mix(in srgb, var(--c-danger) 8%, transparent);
  border-color: rgba(239, 68, 68, 0.25);
  border-color: color-mix(in srgb, var(--c-danger) 25%, transparent);
  color: #991b1b;
}
[data-theme="dark"] .alert-success { color: var(--c-accent); }
[data-theme="dark"] .alert-warning { color: var(--c-warning); }
[data-theme="dark"] .alert-danger { color: #fca5a5; }

/* ===== SAVED RESULTS ===== */
.history-list { display: flex; flex-direction: column; gap: var(--space-3); }
.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--c-bg2);
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
}
.history-item-info { font-size: 0.875rem; }
.history-item-info strong { display: block; font-weight: 600; }
.history-item-info span { color: var(--c-text3); font-size: 0.8rem; }
.history-item-actions { display: flex; gap: var(--space-2); }

/* ===== INPUT NUMBER STEPPER ===== */
.input-stepper {
  display: flex;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.input-stepper:focus-within { border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.12); }
.stepper-btn {
  width: 40px;
  height: 44px;
  background: var(--c-bg2);
  border: none;
  font-size: 1.2rem;
  color: var(--c-text2);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.stepper-btn:hover { background: var(--c-bg3); color: var(--c-primary); }
.stepper-input {
  flex: 1;
  border: none;
  background: var(--c-bg);
  text-align: center;
  font-size: 1rem;
  color: var(--c-text);
  outline: none;
  font-family: var(--font-mono);
  font-weight: 600;
  min-width: 0;
}

/* ===== DEBT LIST ===== */
.debt-list { display: flex; flex-direction: column; gap: var(--space-3); }
.debt-item {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-3);
  background: var(--c-bg2);
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
}
.debt-item .form-input { margin: 0; }
.debt-item .debt-label { font-size: 0.875rem; font-weight: 500; color: var(--c-text3); min-width: 80px; }
.debt-remove {
  width: 28px; height: 28px;
  border-radius: var(--r-sm);
  border: none;
  background: var(--c-bg3);
  color: var(--c-danger);
  cursor: pointer;
  font-size: 1rem;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.debt-remove:hover {
  background: rgba(239, 68, 68, 0.12);
  background: color-mix(in srgb, var(--c-danger) 12%, transparent);
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--c-text3);
}
.empty-state .empty-icon { font-size: 3rem; margin-bottom: var(--space-4); }
.empty-state h3 { margin-bottom: var(--space-2); }

/* ===== LOADING ===== */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  width: 24px; height: 24px;
  border: 3px solid var(--c-border);
  border-top-color: var(--c-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ===== RESPONSIVE TWEAKS ===== */
@media (max-width: 640px) {
  .card { padding: var(--space-4); }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .calc-actions { flex-direction: column; }
  .calc-actions .btn { width: 100%; }
}