/* EMI Calc Pro - Lightweight Global CSS */
/* Replaces Bootstrap for minimal bundle size */

:root {
  --color-primary: #3498db;
  --color-primary-dark: #2980b9;
  --color-secondary: #2ecc71;
  --color-secondary-dark: #27ae60;
  --color-danger: #e74c3c;
  --color-warning: #f39c12;
  --color-success: #27ae60;
  
  --color-text-primary: #2c3e50;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6c757d;
  --color-text-light: #eaeaea;
  
  --color-bg-body: #f5f5f5;
  --color-bg-card: #ffffff;
  --color-bg-header: #2c3e50;
  --color-bg-th: #f4f4f4;
  --color-bg-input-focus: rgba(52, 152, 219, 0.25);
  
  --color-border: #ddd;
  --color-border-focus: #3498db;
  
  --gradient-primary: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  --gradient-feature-icon: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.8rem;
  --radius-xl: 1rem;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  
  --font-family-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.9rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.1rem;
  --font-size-xl: 1.25rem;
  
  --container-max-width: 1200px;
}

[data-theme="dark"] {
  --color-text-primary: #eaeaea;
  --color-text-secondary: #b0b0b0;
  --color-text-muted: #888888;
  --color-bg-body: #1a1a2e;
  --color-bg-card: #16213e;
  --color-bg-header: #0f0f1a;
  --color-bg-th: #1f2937;
  --color-bg-input-focus: rgba(52, 152, 219, 0.3);
  --color-border: #374151;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.4);
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family-base);
  margin: 0;
  padding: var(--spacing-xl);
  background-color: var(--color-bg-body);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ========== GRID SYSTEM ========== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 calc(var(--spacing-sm) * -1);
}

.row.g-2 { --gutter: var(--spacing-sm); }
.row.g-3 { --gutter: var(--spacing-md); }

.row > [class*="col"] {
  padding: 0 var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.col-1 { flex: 0 0 8.333%; max-width: 8.333%; }
.col-2 { flex: 0 0 16.667%; max-width: 16.667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; }
.col-5 { flex: 0 0 41.667%; max-width: 41.667%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.333%; max-width: 58.333%; }
.col-8 { flex: 0 0 66.667%; max-width: 66.667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.333%; max-width: 83.333%; }
.col-11 { flex: 0 0 91.667%; max-width: 91.667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

@media (min-width: 576px) {
  .col-sm-1 { flex: 0 0 8.333%; max-width: 8.333%; }
  .col-sm-2 { flex: 0 0 16.667%; max-width: 16.667%; }
  .col-sm-3 { flex: 0 0 25%; max-width: 25%; }
  .col-sm-4 { flex: 0 0 33.333%; max-width: 33.333%; }
  .col-sm-5 { flex: 0 0 41.667%; max-width: 41.667%; }
  .col-sm-6 { flex: 0 0 50%; max-width: 50%; }
  .col-sm-auto { flex: 0 0 auto; width: auto; }
}

@media (min-width: 768px) {
  .col-md-1 { flex: 0 0 8.333%; max-width: 8.333%; }
  .col-md-2 { flex: 0 0 16.667%; max-width: 16.667%; }
  .col-md-3 { flex: 0 0 25%; max-width: 25%; }
  .col-md-4 { flex: 0 0 33.333%; max-width: 33.333%; }
  .col-md-5 { flex: 0 0 41.667%; max-width: 41.667%; }
  .col-md-6 { flex: 0 0 50%; max-width: 50%; }
  .col-md-auto { flex: 0 0 auto; width: auto; }
}

@media (min-width: 992px) {
  .col-lg-1 { flex: 0 0 8.333%; max-width: 8.333%; }
  .col-lg-2 { flex: 0 0 16.667%; max-width: 16.667%; }
  .col-lg-3 { flex: 0 0 25%; max-width: 25%; }
  .col-lg-4 { flex: 0 0 33.333%; max-width: 33.333%; }
  .col-lg-5 { flex: 0 0 41.667%; max-width: 41.667%; }
  .col-lg-6 { flex: 0 0 50%; max-width: 50%; }
  .col-lg-auto { flex: 0 0 auto; width: auto; }
}

@media (min-width: 1200px) {
  .col-xl-1 { flex: 0 0 8.333%; max-width: 8.333%; }
  .col-xl-2 { flex: 0 0 16.667%; max-width: 16.667%; }
  .col-xl-3 { flex: 0 0 25%; max-width: 25%; }
  .col-xl-4 { flex: 0 0 33.333%; max-width: 33.333%; }
  .col-xl-5 { flex: 0 0 41.667%; max-width: 41.667%; }
  .col-xl-6 { flex: 0 0 50%; max-width: 50%; }
  .col-xl-auto { flex: 0 0 auto; width: auto; }
}

/* ========== FLEXBOX UTILITIES ========== */
.d-flex { display: flex; }
.d-none { display: none; }
.d-block { display: block; }
.d-inline-flex { display: inline-flex; }

.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-grow-1 { flex-grow: 1; }

.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }

.justify-content-start { justify-content: flex-start; }
.justify-content-end { justify-content: flex-end; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-around { justify-content: space-around; }

.align-items-start { align-items: flex-start; }
.align-items-end { align-items: flex-end; }
.align-items-center { align-items: center; }
.align-items-stretch { align-items: stretch; }

.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

.ms-auto { margin-left: auto; }
.me-auto { margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

.m-0 { margin: 0; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.me-1 { margin-right: var(--spacing-xs); }
.me-2 { margin-right: var(--spacing-sm); }
.me-3 { margin-right: var(--spacing-md); }
.ms-1 { margin-left: var(--spacing-xs); }
.ms-2 { margin-left: var(--spacing-sm); }
.ms-3 { margin-left: var(--spacing-md); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.pb-0 { padding-bottom: 0; }
.pt-0 { padding-top: 0; }

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
.h3 { font-size: 1.4rem; }
.h4 { font-size: 1.25rem; }
.h5 { font-size: 1.1rem; }
.h6 { font-size: 1rem; }

p { margin-top: 0; margin-bottom: var(--spacing-md); }

.text-muted { color: var(--color-text-muted); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.text-center { text-align: center; }
.text-start { text-align: left; }
.text-end { text-align: right; }

.fw-bold { font-weight: 700; }
.fw-semibold { font-weight: 600; }
.fw-medium { font-weight: 500; }

.small { font-size: var(--font-size-sm); }

/* ========== FORMS ========== */
.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 0.2rem var(--color-bg-input-focus);
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

.form-control.is-invalid {
  border-color: var(--color-danger);
}

.form-text {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

.invalid-feedback {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-danger);
  margin-top: var(--spacing-xs);
}

.form-check {
  display: flex;
  align-items: center;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.form-check-input {
  width: 1rem;
  height: 1rem;
  margin-left: -1.5rem;
  margin-right: 0.5rem;
  cursor: pointer;
}

.form-check-label {
  cursor: pointer;
  user-select: none;
}

.form-switch {
  padding-left: 2.5rem;
}

.form-switch .form-check-input {
  width: 2.5rem;
  height: 1.25rem;
  margin-left: -2.5rem;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23ccc'/%3e%3c/svg%3e");
  background-position: left center;
  background-repeat: no-repeat;
  background-size: contain;
  border-radius: 1.25rem;
  transition: background-position 0.15s;
}

.form-switch .form-check-input:checked {
  background-position: right center;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e");
}

input[type="number"].form-control {
  max-width: 200px;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 0.2rem var(--color-bg-input-focus);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-success {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #fff;
}

.btn-success:hover {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
}

.btn-secondary {
  background-color: var(--color-text-muted);
  border-color: var(--color-text-muted);
  color: #fff;
}

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

.btn-outline-secondary:hover {
  background-color: var(--color-bg-th);
  color: var(--color-text-primary);
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  text-decoration: none;
}

.btn-link:hover {
  text-decoration: underline;
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: var(--font-size-sm);
}

.btn-block {
  display: block;
  width: 100%;
}

.w-100 { width: 100%; }

/* ========== CARDS ========== */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.card-body {
  padding: var(--spacing-md);
}

.card-header {
  background-color: transparent;
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md);
}

.card-title {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

/* ========== BADGES ========== */
.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.bg-primary {
  background-color: var(--color-primary);
  color: #fff;
}

/* ========== ALERTS ========== */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.alert-success {
  background-color: rgba(46, 204, 113, 0.15);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.d-none { display: none !important; }

/* ========== TABLES ========== */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-base);
}

.table th,
.table td {
  border: 1px solid var(--color-border);
  padding: var(--spacing-sm);
  text-align: left;
}

.table th {
  background-color: var(--color-bg-th);
  font-weight: 600;
}

.table-bordered th,
.table-bordered td {
  border: 1px solid var(--color-border);
}

.table-sm th,
.table-sm td {
  padding: var(--spacing-xs);
}

/* ========== MODAL ========== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.d-none { display: none; }

.modal-dialog {
  width: 100%;
  max-width: 500px;
  margin: var(--spacing-md);
}

.modal-content {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  margin: 0;
  font-size: var(--font-size-lg);
}

.modal-body {
  padding: var(--spacing-md);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
}

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

.modal-lg {
  max-width: 800px;
}

.modal-dialog-centered {
  align-items: center;
  min-height: calc(100% - 2rem);
}

/* ========== DROPDOWN ========== */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 100;
  display: none;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-item {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--color-text-primary);
  text-decoration: none;
  cursor: pointer;
}

.dropdown-item:hover {
  background-color: var(--color-bg-th);
}

.dropdown-item-text {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--color-text-muted);
}

.input-group {
  display: flex;
}

.input-group .form-control {
  flex: 1;
}

.input-group .btn {
  flex-shrink: 0;
}

/* ========== CHART CONTAINER ========== */
.chart-container {
  position: relative;
  height: 300px;
  width: 100%;
}

/* ========== SUMMARY CARDS ========== */
.summary-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  height: 100%;
}

.summary-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.25rem;
  background: var(--gradient-feature-icon);
  color: white;
}

.summary-content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.summary-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.summary-value {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ========== THEME TOGGLE ========== */
.theme-toggle {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
}

.theme-toggle:hover {
  background-color: var(--color-bg-th);
}

/* ========== COLLAPSE ========== */
.collapse {
  display: none;
}

.collapse.show {
  display: block;
}

.transition-icon {
  transition: transform 0.3s ease;
}

[aria-expanded="true"] .transition-icon {
  transform: rotate(180deg);
}

/* ========== UTILITY CLASSES ========== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-xl) 0;
}

.bg-light {
  background-color: var(--color-bg-th);
}

.rounded {
  border-radius: var(--radius-md);
}

/* ========== DARK MODE ========== */
[data-theme="dark"] .form-control {
  background-color: var(--color-bg-card);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

[data-theme="dark"] .table {
  color: var(--color-text-primary);
  background-color: var(--color-bg-card);
}

[data-theme="dark"] .table th {
  background-color: var(--color-bg-th);
}

[data-theme="dark"] .table td {
  background-color: var(--color-bg-card);
}

[data-theme="dark"] .dropdown-menu {
  background-color: var(--color-bg-card);
}

[data-theme="dark"] canvas {
  filter: brightness(0.95) saturate(0.9);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 767px) {
  body { padding: var(--spacing-md); }
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  .summary-card { padding: var(--spacing-sm); }
  .summary-icon { width: 36px; height: 36px; font-size: 0.9rem; }
  .summary-value { font-size: var(--font-size-sm); }
  .chart-container { height: 250px; }
}

@media (max-width: 575px) {
  .chart-container { height: 220px; }
}

/* ========== PRINT ========== */
@media print {
  body { background: white; padding: 0; }
  .btn, .theme-toggle { display: none !important; }
  .chart-container { page-break-inside: avoid; max-width: 50%; }
}

/* ========== ACCESSIBILITY ========== */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}