/*
    [FILE] components.css
    [POS] 共享组件样式 - 导航、按钮、表单、标签、卡片、分页、抽屉
    [IN] base.css (CSS 变量)
    [OUT] 组件样式规则
    [DEP] base.css
    [SIDE EFFECT] 无
    [TEST] 手动测试: 验证各组件样式渲染

    Dribbble Style - Components
    ============================================ */

/* ============================================
   Navigation
    ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    height: 64px;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--color-text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
}

.nav-link-login {
    margin-right: var(--spacing-lg);
}

.nav-actions {
    display: flex;
    align-items: center;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

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

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

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

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

.btn-outline {
    color: var(--color-bg);
    background: transparent;
    border: 1px solid var(--color-bg);
}

.btn-outline:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
}

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

.btn-ghost:hover:not(:disabled) {
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.btn-full {
    width: 100%;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 10px 14px;
    font-size: 15px;
    color: var(--color-text-primary);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast);
}

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

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-text-tertiary);
}

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

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236E6D7A'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.form-search {
    position: relative;
}

.form-search input {
    padding-left: 40px;
}

.form-search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.form-checkbox,
.form-radio {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.form-checkbox input,
.form-radio input {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.form-error {
    color: var(--color-error);
    font-size: 13px;
    margin-top: var(--spacing-xs);
}

/* ============================================
   Tags & Badges
   ============================================ */

.tag {
    display: inline-block;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-sm);
}

.tag-gray {
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
}

.tag-blue {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.tag-green {
    color: var(--color-success);
    background: #DCFCE7;
}

.tag-yellow {
    color: var(--color-warning);
    background: var(--color-warning-bg);
}

.tag-pill {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.tag-pill:hover {
    color: var(--color-bg);
    background: var(--color-primary);
    border-color: var(--color-primary);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

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

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

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* ============================================
   Pagination
   ============================================ */

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.pagination-item {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--spacing-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination-item:hover:not(.disabled):not(.active) {
    border-color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
}

.pagination-item.active {
    color: var(--color-bg);
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.pagination-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-ellipsis {
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
}

/* ============================================
   Status States
   ============================================ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl);
    text-align: center;
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.empty-state-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 400px;
}

.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl);
    text-align: center;
}

.error-state-icon {
    width: 64px;
    height: 64px;
    color: var(--color-error);
    margin-bottom: var(--spacing-lg);
}

.error-state-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.error-state-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Loading / Skeleton
   ============================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-bg-tertiary) 25%,
        var(--color-border-light) 50%,
        var(--color-bg-tertiary) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-card {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.skeleton-image {
    width: 100%;
    aspect-ratio: 16 / 10;
}

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

.skeleton-title {
    height: 20px;
    width: 70%;
    margin-bottom: var(--spacing-md);
}

.skeleton-text {
    height: 14px;
    width: 100%;
    margin-bottom: var(--spacing-sm);
}

.skeleton-text-short {
    height: 14px;
    width: 50%;
}

/* ============================================
   Drawer (Mobile Filter)
    ============================================ */

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 199;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.drawer-overlay.active {
    opacity: 1;
    visibility: visible;
}

.drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 320px;
    background: var(--color-bg);
    z-index: 200;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    display: flex;
    flex-direction: column;
}

.drawer.active {
    transform: translateX(0);
}

.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.drawer-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.drawer-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.drawer-close:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
}

.drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.drawer-footer {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* ============================================
   Footer
    ============================================ */

.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.footer-brand .brand-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-primary);
}

.footer-brand p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-links a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    color: var(--color-primary);
    background: var(--color-bg-secondary);
}

.social-links svg {
    width: 18px;
    height: 18px;
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-column a {
    display: block;
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-column a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-tertiary);
    text-align: center;
}

/* ============================================
   Back to Top
    ============================================ */

.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Responsive Components
    ============================================ */

@media (max-width: 768px) {
    .nav-links,
    .nav-actions {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links.active {
        display: flex;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        gap: var(--spacing-md);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .back-to-top {
        bottom: 16px;
        right: 16px;
    }
}

/* ============================================
   User Menu
   ============================================ */

.user-menu {
    position: relative;
}

.user-menu-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 4px 8px 4px 12px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-menu-toggle:hover {
    background: var(--color-bg-tertiary);
}

.user-menu-toggle.active {
    background: var(--color-bg-tertiary);
}

.user-menu-toggle.active .user-menu-arrow {
    transform: rotate(180deg);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-menu-arrow {
    width: 16px;
    height: 16px;
    color: var(--color-text-tertiary);
    transition: transform var(--transition-fast);
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.user-menu-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    color: var(--color-text-primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
}

.user-menu-item:hover {
    background: var(--color-bg-secondary);
}

.user-menu-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    color: var(--color-text-secondary);
}

.user-menu-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-sm) 0;
}

.user-menu-logout {
    color: var(--color-error);
}

.user-menu-logout .user-menu-icon {
    color: var(--color-error);
}

.user-menu-logout:hover {
    background: var(--color-error-bg);
}