/* =========================
   재사용 가능한 컴포넌트
========================= */

/* ===== 버튼 ===== */
.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--border-radius-lg);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  font-size: var(--font-size-base);
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

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

/* ===== 입력 필드 ===== */
.input {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border-light);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  box-sizing: border-box;
}

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.input-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

/* ===== 셀렉트 ===== */
.select {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border-light);
  font-size: var(--font-size-base);
  background-color: var(--color-bg-white);
  cursor: pointer;
  transition: border-color var(--transition-base);
  box-sizing: border-box;
}

.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===== 카드 ===== */
.card {
  background: var(--color-bg-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: box-shadow var(--transition-base);
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
  min-width: 0;
}

.card:hover {
  box-shadow: var(--shadow-xl);
}

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

.card-title {
  font-size: clamp(0.9rem, 3vw, 1.1rem);
  font-weight: var(--font-weight-semibold);
  margin: 0;
}

.card-body {
  font-size: var(--font-size-base);
}

/* ===== 배지 ===== */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  line-height: 1;
}

.badge-primary {
  background: var(--color-primary);
  color: var(--color-bg-white);
}

.badge-success {
  background: var(--color-success);
  color: var(--color-bg-white);
}

.badge-warning {
  background: var(--color-warning);
  color: var(--color-text);
}

.badge-danger {
  background: var(--color-danger);
  color: var(--color-bg-white);
}

/* ===== 토글 스위치 ===== */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-border-light);
  border-radius: var(--border-radius-full);
  transition: background-color var(--transition-slow), box-shadow var(--transition-base);
}

.switch-slider:hover {
  background-color: #b8b8b8;
  box-shadow: var(--shadow-md);
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--color-bg-white);
  border-radius: 50%;
  transition: transform var(--transition-slow), box-shadow var(--transition-base);
}

.switch-slider:hover::before {
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.switch input:checked + .switch-slider {
  background-color: var(--color-primary);
}

.switch input:checked + .switch-slider:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 2px 8px rgba(30, 111, 217, 0.3);
}

.switch input:checked + .switch-slider::before {
  transform: translateX(24px);
}

/* ===== 그리드 ===== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

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

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

/* ===== 알림 메시지 ===== */
.alert {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-lg);
  border-left: 4px solid;
}

.alert-info {
  background: rgba(54, 157, 231, 0.1);
  border-color: var(--color-info);
  color: var(--color-info);
}

.alert-success {
  background: rgba(49, 165, 82, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-warning {
  background: rgba(237, 188, 64, 0.1);
  border-color: var(--color-warning);
  color: #c9a020;
}

.alert-danger {
  background: rgba(214, 40, 40, 0.1);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

/* ===== 로딩 스피너 ===== */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(37, 99, 235, 0.2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

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

  .grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }

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

  .card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
  }
}

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

  .grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }

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

  .btn {
    padding: 8px 16px;
    font-size: 0.9rem;
  }

  .input,
  .select {
    padding: 10px 12px;
  }
}