/* ===========================================
   📐 LAYOUT - 布局样式
   =========================================== */

/* ===== APP CONTAINER ===== */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
.header {
  background-color: #ffffff;
  border-bottom: var(--border-width) solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

.header__left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__center {
  flex: 1;
  max-width: 400px;
  margin: 0 var(--space-4);
}

.header__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ===== LOGO ===== */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-primary-dark);
}

.logo__icon {
  font-size: var(--font-size-xl);
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 280px;
  background-color: #ffffff;
  border-right: var(--border-width) solid var(--color-gray-200);
  position: fixed;
  top: 73px;
  left: 0;
  height: calc(100vh - 73px);
  overflow-y: auto;
  z-index: var(--z-sticky);
  transition: transform var(--transition-base);
}

.sidebar--collapsed {
  transform: translateX(-100%);
}

.sidebar__nav {
  padding: var(--space-4) 0;
}

.sidebar__footer {
  padding: var(--space-4) var(--space-6);
  border-top: var(--border-width) solid var(--color-gray-200);
  margin-top: auto;
  background-color: var(--color-gray-50);
}

/* ===== NAVIGATION ITEMS ===== */
.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-6);
  color: var(--color-gray-600);
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--border-radius-md);
  margin: 0 var(--space-2);
  position: relative;
  overflow: hidden;
}

.nav-item:hover {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  transform: translateX(2px);
}

.nav-item:hover .nav-item__icon {
  color: var(--color-primary);
}

.nav-item--active {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
  position: relative;
}

.nav-item--active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 0 2px 2px 0;
}

.nav-item--active:hover {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  transform: translateX(2px);
}

.nav-item__icon {
  font-size: var(--font-size-base);
  width: 18px;
  text-align: center;
  transition: transform var(--transition-fast);
}

.nav-item__text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* ===== MAIN CONTENT ===== */
.content {
  flex: 1;
  margin-left: 290px; /* 增加10px来确保内容不被sidebar遮挡 */
  padding: var(--space-6);
  /* 移除min-height，让内容根据实际需要调整高度 */
}

.content--sidebar-collapsed {
  margin-left: 0;
}

/* ===== PAGE ===== */
.page {
  display: none;
  animation: fade-in 0.3s ease;
}

.page.active,
.page--active {
  display: block;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===== PAGE HEADER ===== */
.page-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-width) solid var(--color-gray-200);
}

.page-header__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.page-header__description {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
}

.page-header__content {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
}

.page-header__actions {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* ===== SIDEBAR TOGGLE ===== */
.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-gray-600);
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-fast);
}

.sidebar-toggle:hover {
  background-color: var(--color-gray-100);
}

/* ===== AUTHENTICATION FORMS ===== */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  padding: var(--space-4);
}

/* 认证表单基础样式 */
.auth-form {
  background-color: #ffffff;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
  display: none;
  position: relative;
  overflow: hidden;
}

/* 活跃状态的表单 */
.auth-form--active {
  display: block !important;
  animation: auth-form-fade-in 0.4s ease-out;
}

/* 隐藏状态的表单 */
.auth-form--hidden {
  display: none !important;
}

/* 退出动画 */
.auth-form--exiting {
  animation: auth-form-fade-out 0.3s ease-in forwards;
}

/* 进入动画 */
.auth-form--entering {
  animation: auth-form-slide-in 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 淡入动画 */
@keyframes auth-form-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 淡出动画 */
@keyframes auth-form-fade-out {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
  }
}

/* 滑入动画 */
@keyframes auth-form-slide-in {
  from {
    opacity: 0;
    transform: translateX(40px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.auth-header {
  text-align: center;
  padding: var(--space-8) var(--space-6) var(--space-4);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.05));
  border-bottom: var(--border-width) solid var(--color-gray-200);
}

.auth-header__icon {
  font-size: var(--font-size-4xl);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  display: block;
}

.auth-header__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin: 0 0 var(--space-2) 0;
}

.auth-header__description {
  font-size: var(--font-size-base);
  color: var(--color-gray-600);
  margin: 0;
}

.auth-form__content {
  padding: var(--space-6);
}

.auth-links {
  text-align: center;
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-width) solid var(--color-gray-200);
}

.auth-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(4px);
  transition: opacity var(--transition-base);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-overlay__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.loading-overlay__spinner {
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.loading-overlay__text {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  font-weight: var(--font-weight-medium);
}