/* ===================================
   Language Learning Hub - Components
   Based on Style Guide v1.0.0
   =================================== */

@import './base/variables.css';

/* ===================================
   ATOMS - Basic Building Blocks
   =================================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid rgba(91, 78, 140, 0.3);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background: var(--color-secondary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-dark);
}

.btn-accent:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-ghost:hover {
  background: var(--primary-50);
  border-color: var(--color-primary-light);
}

.btn-link {
  background: transparent;
  border: none;
  color: var(--color-primary);
  padding: 0;
}

.btn-link:hover {
  color: var(--color-primary-light);
  transform: none;
  text-decoration: underline;
}

/* Button Sizes */
.btn-sm {
  padding: 6px var(--space-md);
  font-size: var(--fs-small);
}

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--fs-h4);
}

/* Button States */
.btn:disabled,
.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: btn-spin 0.6s linear infinite;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-tiny);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  line-height: 1;
}

/* Badge Variants - Status */
.badge-free,
.badge-success {
  background: #e8f9e0;
  color: var(--color-success);
}

.badge-paid,
.badge-warning {
  background: var(--accent-50);
  color: var(--color-accent-dark);
}

.badge-error {
  background: #ffe8e8;
  color: var(--color-error);
}

.badge-info {
  background: #e8f2fb;
  color: var(--color-info);
}

/* Badge Variants - Levels */
.badge-level,
.badge-primary {
  background: var(--primary-50);
  color: var(--color-primary);
}

.badge-new {
  background: var(--secondary-50);
  color: var(--color-secondary);
}

/* Input Fields */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-label {
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-gray-700);
}

.input-field {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--color-dark);
  background: var(--color-white);
  transition: all var(--transition-base);
}

.input-field::placeholder {
  color: var(--color-gray-400);
}

.input-field:hover {
  border-color: var(--color-gray-300);
}

.input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(91, 78, 140, 0.1);
}

.input-field:disabled {
  background: var(--color-gray-100);
  cursor: not-allowed;
  opacity: 0.6;
}

.input-field.input-error {
  border-color: var(--color-error);
}

.input-field.input-error:focus {
  box-shadow: 0 0 0 3px rgba(245, 34, 45, 0.1);
}

/* Select Dropdown */
.select-field {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235E5869' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-sm) center;
  padding-right: 36px;
}

/* Search Input */
.search-input {
  padding-left: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16' fill='none'%3E%3Ccircle cx='7' cy='7' r='5' stroke='%238E8896' stroke-width='2'/%3E%3Cpath d='M11 11L14 14' stroke='%238E8896' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: var(--space-md) center;
}

/* ===================================
   MOLECULES - Compound Components
   =================================== */

/* Card Base */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-gray-200);
}

/* Language Card */
.language-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  cursor: pointer;
}

.language-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.card-flag {
  font-size: 2rem;
  line-height: 1;
}

.card-title-area {
  flex: 1;
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  color: var(--color-dark);
  margin: 0 0 4px 0;
  line-height: var(--lh-tight);
}

.card-subtitle {
  font-size: var(--fs-small);
  color: var(--color-gray-600);
  margin: 0;
}

.card-description {
  font-size: var(--fs-body);
  color: var(--color-gray-700);
  margin: var(--space-md) 0;
  line-height: var(--lh-normal);
}

.card-stats {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-gray-100);
  border-bottom: 1px solid var(--color-gray-100);
  margin: var(--space-md) 0;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  line-height: 1;
}

.stat-label {
  font-size: var(--fs-tiny);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
}

.card-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  transition: all var(--transition-base);
}

.card-cta:hover {
  color: var(--color-primary-light);
  gap: 10px;
}

/* Resource Card */
.resource-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.resource-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.language-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-50);
  color: var(--color-primary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-tiny);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-sm);
}

.resource-title {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: var(--fw-semibold);
  color: var(--color-dark);
  text-decoration: none;
  transition: color var(--transition-base);
}

.resource-title:hover {
  color: var(--color-primary);
}

.resource-features {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: var(--space-sm) 0;
}

.feature-item {
  font-size: var(--fs-tiny);
  color: var(--color-gray-600);
  padding: 3px 8px;
  background: var(--color-gray-50);
  border-radius: var(--radius-sm);
}

.resource-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-md);
}

.meta-badge {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-tiny);
  font-weight: var(--fw-semibold);
}

.meta-badge.free {
  background: #e8f9e0;
  color: var(--color-success);
}

.meta-badge.paid {
  background: var(--accent-50);
  color: var(--color-accent-dark);
}

.meta-badge.level {
  background: var(--primary-50);
  color: var(--color-primary);
}

/* Stat Box (Dashboard Style) */
.stat-box {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.stat-box-number {
  display: block;
  font-size: 2rem;
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-box-label {
  font-size: var(--fs-small);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
}

/* Filter Components */
.filter-bar {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  flex-wrap: wrap;
  padding: var(--space-md);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.filter-label {
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
  color: var(--color-gray-700);
  text-transform: uppercase;
  letter-spacing: var(--ls-wide);
}

.filter-btn {
  padding: 8px var(--space-md);
  background: var(--color-white);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: 6px;
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--primary-50);
}

.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* ===================================
   ORGANISMS - Complex Sections
   =================================== */

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(250, 249, 251, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(196, 191, 201, 0.2);
  z-index: var(--z-sticky);
  transition: all var(--transition-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-sm) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: var(--fw-semibold);
  font-size: 1.25rem;
  color: var(--color-dark);
  text-decoration: none;
  transition: transform var(--transition-base);
}

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

.logo-icon {
  font-size: 1.5rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-3px);
  }
}

.logo-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
}

.nav-link {
  position: relative;
  color: var(--color-gray-700);
  font-weight: var(--fw-medium);
  padding: var(--space-xs) 0;
  text-decoration: none;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-dark);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Responsive Grid */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   UTILITY CLASSES
   =================================== */

/* Spacing */
.mt-xs {
  margin-top: var(--space-xs);
}
.mt-sm {
  margin-top: var(--space-sm);
}
.mt-md {
  margin-top: var(--space-md);
}
.mt-lg {
  margin-top: var(--space-lg);
}
.mt-xl {
  margin-top: var(--space-xl);
}

.mb-xs {
  margin-bottom: var(--space-xs);
}
.mb-sm {
  margin-bottom: var(--space-sm);
}
.mb-md {
  margin-bottom: var(--space-md);
}
.mb-lg {
  margin-bottom: var(--space-lg);
}
.mb-xl {
  margin-bottom: var(--space-xl);
}

.p-xs {
  padding: var(--space-xs);
}
.p-sm {
  padding: var(--space-sm);
}
.p-md {
  padding: var(--space-md);
}
.p-lg {
  padding: var(--space-lg);
}
.p-xl {
  padding: var(--space-xl);
}

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

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

/* Flexbox Utilities */
.flex-row {
  flex-direction: row;
}
.flex-col {
  flex-direction: column;
}
.flex-wrap {
  flex-wrap: wrap;
}
.items-center {
  align-items: center;
}
.items-start {
  align-items: flex-start;
}
.items-end {
  align-items: flex-end;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.justify-end {
  justify-content: flex-end;
}
.gap-sm {
  gap: var(--space-sm);
}
.gap-md {
  gap: var(--space-md);
}
.gap-lg {
  gap: var(--space-lg);
}

/* Visibility */
.hidden {
  display: none !important;
}
.visible {
  display: block !important;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}