/* GitHub-inspired Theme */

/* CSS Variables */
:root {
  --color-primary: #0969da;
  --color-primary-hover: #0550ae;
  --color-success: #1a7f37;
  --color-success-hover: #116329;
  --color-danger: #cf222e;
  --color-danger-hover: #a40e26;
  --color-text: #1f2328;
  --color-text-secondary: #59636e;
  --color-border: #d1d9e0;
  --color-bg: #ffffff;
  --color-bg-secondary: #f6f8fa;
  --color-bg-tertiary: #eaeef2;
  --border-radius: 6px;
  --spacing-unit: 8px;
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
}

.container-sm {
  max-width: 768px;
}

.container-lg {
  max-width: 1400px;
}

/* Header */
.header {
  background-color: var(--color-text);
  color: white;
  padding: 16px 0;
  border-bottom: 1px solid #d1d9e0;
}

.header-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

/* Main Content Area */
.main {
  padding: 24px 0;
}

/* Card Component */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 16px;
  margin-bottom: 16px;
}

.card-header {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 12px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  margin: 0;
}

.card-footer {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

/* Button Styles */
.btn {
  display: inline-block;
  padding: 5px 16px;
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid;
  border-radius: var(--border-radius);
  appearance: none;
  text-decoration: none;
  text-align: center;
  transition: all 0.2s ease;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* Primary Button */
.btn-primary {
  color: #ffffff;
  background-color: var(--color-primary);
  border-color: rgba(31, 35, 40, 0.15);
  box-shadow: 0 1px 0 rgba(31, 35, 40, 0.1);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: rgba(31, 35, 40, 0.15);
}

.btn-primary:active:not(:disabled) {
  background-color: #033d8b;
  box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.2);
}

/* Secondary Button */
.btn-secondary {
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border-color: rgba(31, 35, 40, 0.15);
  box-shadow: 0 1px 0 rgba(31, 35, 40, 0.04);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-bg-tertiary);
  border-color: rgba(31, 35, 40, 0.15);
}

.btn-secondary:active:not(:disabled) {
  background-color: #d1d5da;
  box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.2);
}

/* Success Button */
.btn-success {
  color: #ffffff;
  background-color: var(--color-success);
  border-color: rgba(31, 35, 40, 0.15);
  box-shadow: 0 1px 0 rgba(31, 35, 40, 0.1);
}

.btn-success:hover:not(:disabled) {
  background-color: var(--color-success-hover);
}

.btn-success:active:not(:disabled) {
  background-color: #055d20;
  box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.2);
}

/* Danger Button */
.btn-danger {
  color: #ffffff;
  background-color: var(--color-danger);
  border-color: rgba(31, 35, 40, 0.15);
  box-shadow: 0 1px 0 rgba(31, 35, 40, 0.1);
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-danger-hover);
}

.btn-danger:active:not(:disabled) {
  background-color: #82071e;
  box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.2);
}

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

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-border);
}

/* Button Sizes */
.btn-sm {
  padding: 3px 12px;
  font-size: 12px;
  line-height: 18px;
}

.btn-lg {
  padding: 10px 20px;
  font-size: 16px;
  line-height: 24px;
}

/* Button Block */
.btn-block {
  display: block;
  width: 100%;
}

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -8px;
  margin-left: -8px;
}

.col {
  flex: 1;
  padding-right: 8px;
  padding-left: 8px;
  margin-bottom: 16px;
}

.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-5 { flex: 0 0 41.666667%; max-width: 41.666667%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.333333%; max-width: 58.333333%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
.col-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* Responsive Grid - Mobile First Approach */
/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
  .col-sm-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
  .col-sm-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-sm-3 { flex: 0 0 25%; max-width: 25%; }
  .col-sm-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-sm-6 { flex: 0 0 50%; max-width: 50%; }
  .col-sm-12 { flex: 0 0 100%; max-width: 100%; }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  .col-md-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
  .col-md-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-md-3 { flex: 0 0 25%; max-width: 25%; }
  .col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-md-6 { flex: 0 0 50%; max-width: 50%; }
  .col-md-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-md-12 { flex: 0 0 100%; max-width: 100%; }
}

/* Large devices (desktops, 1024px and up) */
@media (min-width: 1024px) {
  .col-lg-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
  .col-lg-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
  .col-lg-3 { flex: 0 0 25%; max-width: 25%; }
  .col-lg-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-lg-6 { flex: 0 0 50%; max-width: 50%; }
  .col-lg-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-lg-12 { flex: 0 0 100%; max-width: 100%; }
}

/* Utility Classes */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: calc(var(--spacing-unit) * 1); }
.mt-2 { margin-top: calc(var(--spacing-unit) * 2); }
.mt-3 { margin-top: calc(var(--spacing-unit) * 3); }
.mt-4 { margin-top: calc(var(--spacing-unit) * 4); }
.mt-5 { margin-top: calc(var(--spacing-unit) * 5); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: calc(var(--spacing-unit) * 1); }
.mb-2 { margin-bottom: calc(var(--spacing-unit) * 2); }
.mb-3 { margin-bottom: calc(var(--spacing-unit) * 3); }
.mb-4 { margin-bottom: calc(var(--spacing-unit) * 4); }
.mb-5 { margin-bottom: calc(var(--spacing-unit) * 5); }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: calc(var(--spacing-unit) * 1); }
.pt-2 { padding-top: calc(var(--spacing-unit) * 2); }
.pt-3 { padding-top: calc(var(--spacing-unit) * 3); }
.pt-4 { padding-top: calc(var(--spacing-unit) * 4); }
.pt-5 { padding-top: calc(var(--spacing-unit) * 5); }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: calc(var(--spacing-unit) * 1); }
.pb-2 { padding-bottom: calc(var(--spacing-unit) * 2); }
.pb-3 { padding-bottom: calc(var(--spacing-unit) * 3); }
.pb-4 { padding-bottom: calc(var(--spacing-unit) * 4); }
.pb-5 { padding-bottom: calc(var(--spacing-unit) * 5); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--color-text-secondary); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }

.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }

.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-baseline { align-items: baseline; }
.align-items-stretch { align-items: stretch; }

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

/* Alert Component */
.alert {
  padding: 16px;
  margin-bottom: 16px;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
}

.alert-info {
  color: #0969da;
  background-color: #ddf4ff;
  border-color: #54aeff;
}

.alert-success {
  color: #1a7f37;
  background-color: #dafbe1;
  border-color: #4ac26b;
}

.alert-warning {
  color: #9a6700;
  background-color: #fff8c5;
  border-color: #f0b72f;
}

.alert-danger {
  color: #cf222e;
  background-color: #ffebe9;
  border-color: #ff6a69;
}

/* Badge Component */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 500;
  line-height: 18px;
  border-radius: 12px;
  white-space: nowrap;
}

.badge-primary {
  color: #ffffff;
  background-color: var(--color-primary);
}

.badge-success {
  color: #ffffff;
  background-color: var(--color-success);
}

.badge-danger {
  color: #ffffff;
  background-color: var(--color-danger);
}

.badge-secondary {
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}

/* Form Controls */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
  font-size: 14px;
}

.form-control {
  display: block;
  width: 100%;
  padding: 5px 12px;
  font-size: 14px;
  line-height: 20px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  outline: none;
  box-shadow: inset 0 1px 0 rgba(208, 215, 222, 0.2);
  transition: border-color 0.2s ease;
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: 2px solid var(--color-primary);
  outline-offset: -1px;
}

.form-control::placeholder {
  color: var(--color-text-secondary);
  opacity: 1;
}

textarea.form-control {
  min-height: 80px;
  resize: vertical;
}

/* Navigation */
.nav {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 8px;
}

.nav-item {
  display: inline-block;
}

.nav-link {
  display: inline-block;
  padding: 8px 16px;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: background-color 0.2s ease;
}

.nav-link:hover {
  background-color: var(--color-bg-secondary);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--color-bg);
  font-weight: 600;
}

/* Responsive Utilities */
@media (min-width: 576px) {
  .d-sm-none { display: none; }
  .d-sm-block { display: block; }
  .d-sm-inline { display: inline; }
  .d-sm-inline-block { display: inline-block; }
  .d-sm-flex { display: flex; }
}

@media (min-width: 768px) {
  .d-md-none { display: none; }
  .d-md-block { display: block; }
  .d-md-inline { display: inline; }
  .d-md-inline-block { display: inline-block; }
  .d-md-flex { display: flex; }
}

@media (min-width: 1024px) {
  .d-lg-none { display: none; }
  .d-lg-block { display: block; }
  .d-lg-inline { display: inline; }
  .d-lg-inline-block { display: inline-block; }
  .d-lg-flex { display: flex; }
}