/**
 * Graphite Core Styles
 * Base styles, layout components, cards, and form elements
 * Optimized for performance with CSS containment
 */

/* ============================================
   1. CSS Reset & Base Styles
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

ul, ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  padding: 0.2em 0.4em;
  background-color: var(--bg-tertiary);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
}

pre {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  padding: var(--spacing-sm);
  background-color: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   2. Layout Components
   ============================================ */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.container-fluid {
  width: 100%;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }
.container-2xl { max-width: var(--container-2xl); }

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
.grid-cols-12 { grid-template-columns: repeat(12, 1fr); }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Flexbox Layout */
.flex {
  display: flex;
}

.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

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

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

.flex-1 { flex: 1; }
.flex-auto { flex: auto; }
.flex-none { flex: none; }

/* Section */
.section {
  padding: var(--spacing-2xl) 0;
  contain: layout style;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section-content {
  margin-top: var(--spacing-lg);
}

/* ============================================
   3. Card Component
   ============================================ */

.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-shadow);
  padding: var(--card-padding);
  transition: var(--transition-normal);
  overflow: hidden;
  contain: layout style paint;
}

.card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-4px);
  will-change: transform;
}

.card:not(:hover) {
  will-change: auto;
}

.card-header {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-light);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.card-body {
  padding: var(--spacing-sm) 0;
}

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

/* Card Variants */
.card-flat {
  box-shadow: none;
  border: 1px solid var(--border-color);
}

.card-elevated {
  box-shadow: var(--shadow-lg);
}

.card-primary {
  border-color: var(--primary-color);
  border-width: 2px;
}

.card-success {
  border-color: var(--status-success);
  background-color: var(--status-success-light);
}

.card-warning {
  border-color: var(--status-warning);
  background-color: var(--status-warning-light);
}

.card-error {
  border-color: var(--status-error);
  background-color: var(--status-error-light);
}

/* ============================================
   4. Form Components
   ============================================ */

/* Form Group */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-label-required::after {
  content: ' *';
  color: var(--status-error);
}

/* Input Fields */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  height: var(--input-height);
  padding: var(--input-padding-y) var(--input-padding-x);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: var(--input-border-width) solid var(--border-color);
  border-radius: var(--input-border-radius);
  transition: var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--input-focus-border-color);
  box-shadow: var(--input-focus-shadow);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--bg-tertiary);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-input::placeholder {
  color: var(--text-light);
}

.form-textarea {
  height: auto;
  min-height: 100px;
  resize: vertical;
}

/* Input States */
.form-input.is-valid,
.form-select.is-valid {
  border-color: var(--status-success);
}

.form-input.is-invalid,
.form-select.is-invalid {
  border-color: var(--status-error);
}

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

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--button-height);
  padding: var(--button-padding-y) var(--button-padding-x);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  border-radius: var(--button-border-radius);
  transition: var(--transition-fast);
  outline: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  will-change: transform;
}

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

.btn:not(:hover):not(:active) {
  will-change: auto;
}

.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.2);
}

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

/* Button Variants */
.btn-primary {
  color: var(--text-inverse);
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

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

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

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

.btn-success {
  color: var(--text-inverse);
  background-color: var(--status-success);
  border-color: var(--status-success);
}

.btn-success:hover {
  background-color: #218838;
  border-color: #1e7e34;
}

.btn-danger {
  color: var(--text-inverse);
  background-color: var(--status-error);
  border-color: var(--status-error);
}

.btn-danger:hover {
  background-color: #c82333;
  border-color: #bd2130;
}

.btn-warning {
  color: var(--text-primary);
  background-color: var(--status-warning);
  border-color: var(--status-warning);
}

.btn-warning:hover {
  background-color: #e0a800;
  border-color: #d39e00;
}

.btn-info {
  color: var(--text-inverse);
  background-color: var(--status-info);
  border-color: var(--status-info);
}

.btn-info:hover {
  background-color: #138496;
  border-color: #117a8b;
}

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

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

/* Button Sizes */
.btn-sm {
  min-height: 36px;
  padding: 0.375rem 1rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  min-height: 52px;
  padding: 0.75rem 2rem;
  font-size: var(--font-size-lg);
}

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

/* Select Dropdown */
.form-select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 16px 12px;
  padding-right: 2.5rem;
  appearance: none;
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.form-check-input {
  width: 20px;
  height: 20px;
  margin-right: var(--spacing-xs);
  cursor: pointer;
}

.form-check-label {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  cursor: pointer;
}

/* File Input */
.form-file {
  position: relative;
  display: inline-block;
  width: 100%;
}

.form-file-input {
  position: absolute;
  width: 0.1px;
  height: 0.1px;
  opacity: 0;
  overflow: hidden;
  z-index: -1;
}

.form-file-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--button-height);
  padding: var(--button-padding-y) var(--button-padding-x);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
}

.form-file-label:hover {
  border-color: var(--primary-color);
  background-color: var(--bg-hover);
}

/* ============================================
   5. Utility Classes
   ============================================ */

/* Spacing */
.m-0 { margin: 0; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.ml-0 { margin-left: 0; }
.mr-0 { margin-right: 0; }

.m-auto { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }

.p-0 { padding: 0; }
.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }
.pl-0 { padding-left: 0; }
.pr-0 { padding-right: 0; }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Text Colors */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--status-success); }
.text-warning { color: var(--status-warning); }
.text-error { color: var(--status-error); }
.text-info { color: var(--status-info); }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* Visibility */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Overflow */
.overflow-auto { overflow: auto; }
.overflow-hidden { overflow: hidden; }
.overflow-scroll { overflow: scroll; }

/* Position */
.position-relative { position: relative; }
.position-absolute { position: absolute; }
.position-fixed { position: fixed; }
.position-sticky { position: sticky; }

/* Width & Height */
.w-100 { width: 100%; }
.h-100 { height: 100%; }
.w-auto { width: auto; }
.h-auto { height: auto; }

/* Border */
.border { border: 1px solid var(--border-color); }
.border-0 { border: 0; }
.border-top { border-top: 1px solid var(--border-color); }
.border-bottom { border-bottom: 1px solid var(--border-color); }

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

/* Shadow */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-none { box-shadow: none; }