/* Modern Header */
#modern-header {
    position: sticky;
    top: 0;
    z-index: var(--modern-z-sticky);
    height: var(--modern-header-height);
    background: var(--modern-surface);
    border-bottom: 1px solid var(--modern-border-light);
    transition: box-shadow var(--modern-transition-base);
}
#modern-header.modern-header--scrolled {
    box-shadow: var(--modern-shadow-md);
}
.modern-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--modern-content-max-width);
    margin: 0 auto;
    padding: 0 var(--modern-space-5);
}
.modern-header__logo {
    display: flex;
    align-items: center;
    gap: var(--modern-space-3);
    flex-shrink: 0;
}
.modern-header__logo img {
    height: 32px;
    width: auto;
}
.modern-header__logo-text {
    font-size: var(--modern-font-size-lg);
    font-weight: 700;
    color: var(--modern-text-primary);
    text-decoration: none;
}
.modern-header__logo-text:hover {
    color: var(--modern-primary);
}
.modern-header__nav {
    display: flex;
    align-items: center;
    gap: var(--modern-space-1);
    flex: 1;
    justify-content: center;
}
.modern-header__nav a {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    font-size: var(--modern-font-size-sm);
    font-weight: 500;
    color: var(--modern-text-secondary);
    text-decoration: none;
    border-radius: var(--modern-radius-sm);
    transition: all var(--modern-transition-fast);
    white-space: nowrap;
}
.modern-header__nav a:hover,
.modern-header__nav a.nav-active {
    color: var(--modern-primary);
    background: var(--modern-primary-light);
}
.modern-header__actions {
    display: flex;
    align-items: center;
    gap: var(--modern-space-2);
    flex-shrink: 0;
}

/* Header Search */
.modern-header__search {
    position: relative;
    display: flex;
    align-items: center;
}
.modern-header__search input {
    width: 200px;
    height: 38px;
    padding: 8px 38px 8px 14px;
    font-size: var(--modern-font-size-sm);
    color: var(--modern-text-primary);
    background: var(--modern-surface-secondary);
    border: 1px solid var(--modern-border-light);
    border-radius: var(--modern-radius-full);
    outline: none;
    transition: all var(--modern-transition-fast);
}
.modern-header__search input:focus {
    width: 260px;
    border-color: var(--modern-primary);
    background: var(--modern-surface);
    box-shadow: 0 0 0 3px var(--modern-primary-light);
}
.modern-header__search input::placeholder {
    color: var(--modern-text-quaternary);
}
.modern-header__search button {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--modern-text-tertiary);
    cursor: pointer;
    border-radius: var(--modern-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--modern-transition-fast);
}
.modern-header__search button:hover {
    color: var(--modern-primary);
    background: var(--modern-primary-light);
}

/* Header Notification Bell */
.modern-header__notification {
    position: relative;
    cursor: pointer;
}
.modern-header__notification-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: transparent;
    border: none;
    border-radius: var(--modern-radius-full);
    color: var(--modern-text-secondary);
    cursor: pointer;
    transition: all var(--modern-transition-fast);
}
.modern-header__notification-btn:hover {
    background: var(--modern-surface-hover);
    color: var(--modern-text-primary);
}
.modern-header__notification-dot {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 8px;
    height: 8px;
    background: var(--modern-danger);
    border-radius: var(--modern-radius-full);
    border: 2px solid var(--modern-surface);
}
.modern-header__notification-count {
    position: absolute;
    top: 2px;
    right: 2px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    font-size: 11px;
    font-weight: 600;
    line-height: 18px;
    text-align: center;
    color: #fff;
    background: var(--modern-danger);
    border-radius: var(--modern-radius-full);
    border: 2px solid var(--modern-surface);
}

/* Header User Menu */
.modern-header__user {
    position: relative;
}
.modern-header__user-btn {
    display: flex;
    align-items: center;
    gap: var(--modern-space-2);
    padding: 4px;
    background: transparent;
    border: none;
    border-radius: var(--modern-radius-full);
    cursor: pointer;
    transition: all var(--modern-transition-fast);
}
.modern-header__user-btn:hover {
    background: var(--modern-surface-hover);
}

/* Modern Sidebar */
.modern-sidebar {
    position: fixed;
    top: var(--modern-header-height);
    left: 0;
    width: var(--modern-sidebar-width);
    height: calc(100vh - var(--modern-header-height));
    background: var(--modern-surface);
    border-right: 1px solid var(--modern-border-light);
    padding: var(--modern-space-4);
    overflow-y: auto;
    z-index: var(--modern-z-sticky);
}
.modern-sidebar__section {
    margin-bottom: var(--modern-space-6);
}
.modern-sidebar__title {
    font-size: var(--modern-font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--modern-text-tertiary);
    margin-bottom: var(--modern-space-3);
    padding: 0 var(--modern-space-2);
}
.modern-sidebar__category {
    display: flex;
    align-items: center;
    gap: var(--modern-space-3);
    padding: 8px 12px;
    font-size: var(--modern-font-size-sm);
    color: var(--modern-text-secondary);
    text-decoration: none;
    border-radius: var(--modern-radius-sm);
    transition: all var(--modern-transition-fast);
}
.modern-sidebar__category:hover,
.modern-sidebar__category--active {
    color: var(--modern-primary);
    background: var(--modern-primary-light);
}
.modern-sidebar__category-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.modern-sidebar__category-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.modern-sidebar__category-count {
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
}

/* Modern Sidebar Topic List */
.modern-sidebar__topic {
    display: flex;
    align-items: flex-start;
    gap: var(--modern-space-3);
    padding: 8px 12px;
    text-decoration: none;
    border-radius: var(--modern-radius-sm);
    transition: all var(--modern-transition-fast);
}
.modern-sidebar__topic:hover {
    background: var(--modern-surface-hover);
}
.modern-sidebar__topic-title {
    font-size: var(--modern-font-size-sm);
    color: var(--modern-text-primary);
    line-height: var(--modern-line-height-tight);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.modern-sidebar__topic-meta {
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
    margin-top: 2px;
}

/* Sidebar Toggle (Mobile) */
.modern-sidebar-toggle {
    display: none;
}
.modern-sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--modern-z-sticky) - 1);
}

/* Modern Layout Container */
.modern-layout {
    display: grid;
    grid-template-columns: var(--modern-sidebar-width) 1fr;
    max-width: var(--modern-content-max-width);
    margin: 0 auto;
    min-height: calc(100vh - var(--modern-header-height));
}
.modern-layout--no-sidebar {
    grid-template-columns: 1fr;
}
.modern-layout__main {
    padding: var(--modern-space-5);
    min-width: 0;
}
.modern-layout__main--wide {
    padding: var(--modern-space-5) var(--modern-space-8);
}
.modern-layout__aside {
    padding: var(--modern-space-5) var(--modern-space-5) var(--modern-space-5) 0;
}

/* Modern Breadcrumb */
.modern-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--modern-space-2);
    padding: var(--modern-space-3) 0;
    font-size: var(--modern-font-size-sm);
    color: var(--modern-text-tertiary);
}
.modern-breadcrumb a {
    color: var(--modern-text-secondary);
    text-decoration: none;
    transition: color var(--modern-transition-fast);
}
.modern-breadcrumb a:hover {
    color: var(--modern-primary);
}
.modern-breadcrumb__sep {
    color: var(--modern-text-quaternary);
    user-select: none;
}

/* Thread List - Flarum Style Topic Cards */
.modern-thread-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.modern-thread-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--modern-space-4);
    padding: var(--modern-space-4) var(--modern-space-5);
    background: var(--modern-surface);
    text-decoration: none;
    border: 1px solid var(--modern-border-light);
    border-radius: 0;
    transition: all var(--modern-transition-fast);
    animation: modern-fade-in 0.3s ease-out forwards;
}
.modern-thread-card:first-child {
    border-radius: var(--modern-radius-md) var(--modern-radius-md) 0 0;
}
.modern-thread-card:last-child {
    border-radius: 0 0 var(--modern-radius-md) var(--modern-radius-md);
}
.modern-thread-card:only-child {
    border-radius: var(--modern-radius-md);
}
.modern-thread-card:hover {
    background: var(--modern-surface-hover);
    border-color: var(--modern-border);
}
.modern-thread-card--sticky {
    background: var(--modern-success-light);
    border-color: rgba(34,197,94,0.2);
}
.modern-thread-card--sticky:hover {
    background: #d0f5e0;
}
.modern-thread-card__avatar {}
.modern-thread-card__avatar img {
    width: 44px;
    height: 44px;
    border-radius: var(--modern-radius-avatar);
    object-fit: cover;
}
.modern-thread-card__content {
    min-width: 0;
}
.modern-thread-card__title {
    font-size: var(--modern-font-size-md);
    font-weight: 600;
    color: var(--modern-text-primary);
    line-height: var(--modern-line-height-tight);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.modern-thread-card__title a {
    color: inherit;
    text-decoration: none;
}
.modern-thread-card__title a:hover {
    color: var(--modern-primary);
}
.modern-thread-card__meta {
    display: flex;
    align-items: center;
    gap: var(--modern-space-3);
    flex-wrap: wrap;
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
}
.modern-thread-card__tags {
    display: flex;
    gap: var(--modern-space-2);
    flex-wrap: wrap;
}
.modern-thread-card__stats {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    flex-shrink: 0;
}
.modern-thread-card__replies {
    font-size: var(--modern-font-size-sm);
    font-weight: 600;
    color: var(--modern-text-primary);
}
.modern-thread-card__views {
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
}
.modern-thread-card__last-post {
    display: flex;
    align-items: center;
    gap: var(--modern-space-2);
}
.modern-thread-card__last-post img {
    width: 28px;
    height: 28px;
    border-radius: var(--modern-radius-avatar);
}
.modern-thread-card__last-post-time {
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
}

/* Forum Card Grid */
.modern-forum-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--modern-space-4);
}
.modern-forum-card {
    padding: var(--modern-space-5);
    cursor: pointer;
}
.modern-forum-card__name {
    font-size: var(--modern-font-size-lg);
    font-weight: 600;
    color: var(--modern-text-primary);
    margin-bottom: var(--modern-space-2);
}
.modern-forum-card__desc {
    font-size: var(--modern-font-size-sm);
    color: var(--modern-text-tertiary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.modern-forum-card__stats {
    display: flex;
    gap: var(--modern-space-4);
    margin-top: var(--modern-space-3);
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
}
.modern-forum-card__stats strong {
    color: var(--modern-text-primary);
}

/* Modern Thread View */
.modern-thread {}
.modern-thread__header {
    padding: var(--modern-space-5) 0;
    margin-bottom: var(--modern-space-4);
    border-bottom: 1px solid var(--modern-border-light);
}
.modern-thread__title {
    font-size: var(--modern-font-size-3xl);
    font-weight: 700;
    color: var(--modern-text-primary);
    line-height: var(--modern-line-height-tight);
    margin-bottom: var(--modern-space-3);
}
.modern-thread__meta {
    display: flex;
    align-items: center;
    gap: var(--modern-space-4);
    font-size: var(--modern-font-size-sm);
    color: var(--modern-text-tertiary);
}
.modern-post {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: var(--modern-space-4);
    padding: var(--modern-space-5);
    margin-bottom: var(--modern-space-3);
}
.modern-post__sidebar {}
.modern-post__avatar {}
.modern-post__avatar img {
    width: 48px;
    height: 48px;
    border-radius: var(--modern-radius-avatar);
}
.modern-post__body {
    min-width: 0;
}
.modern-post__header {
    display: flex;
    align-items: center;
    gap: var(--modern-space-3);
    margin-bottom: var(--modern-space-3);
    flex-wrap: wrap;
}
.modern-post__author {
    font-weight: 600;
    color: var(--modern-text-primary);
}
.modern-post__time {
    font-size: var(--modern-font-size-xs);
    color: var(--modern-text-tertiary);
}
.modern-post__content {
    font-size: var(--modern-font-size-md);
    line-height: var(--modern-line-height-relaxed);
    color: var(--modern-text-primary);
}
.modern-post__content p {
    margin-bottom: var(--modern-space-4);
}
.modern-post__content img {
    border-radius: var(--modern-radius-md);
    max-width: 100%;
}

/* Sticky Actions Bar */
.modern-thread-actions {
    position: sticky;
    top: var(--modern-header-height);
    z-index: calc(var(--modern-z-sticky) - 1);
    display: flex;
    align-items: center;
    gap: var(--modern-space-3);
    padding: var(--modern-space-3) var(--modern-space-5);
    background: var(--modern-surface);
    border: 1px solid var(--modern-border-light);
    border-radius: var(--modern-radius-md);
    margin-bottom: var(--modern-space-4);
}

/* Floating Reply Button (mobile) */
.modern-fab {
    display: none;
    position: fixed;
    bottom: var(--modern-space-6);
    right: var(--modern-space-6);
    z-index: var(--modern-z-fixed);
    width: 56px;
    height: 56px;
    border-radius: var(--modern-radius-full);
    background: var(--modern-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    box-shadow: var(--modern-shadow-lg);
    transition: all var(--modern-transition-fast);
    align-items: center;
    justify-content: center;
}
.modern-fab:hover {
    background: var(--modern-primary-hover);
    transform: scale(1.05);
}
.modern-fab svg {
    width: 24px;
    height: 24px;
}

/* Back to Top */
.modern-back-to-top {
    position: fixed;
    bottom: var(--modern-space-6);
    right: var(--modern-space-6);
    z-index: calc(var(--modern-z-fixed) - 1);
    width: 44px;
    height: 44px;
    border-radius: var(--modern-radius-full);
    background: var(--modern-surface);
    border: 1px solid var(--modern-border);
    color: var(--modern-text-secondary);
    cursor: pointer;
    box-shadow: var(--modern-shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--modern-transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}
.modern-back-to-top--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.modern-back-to-top:hover {
    background: var(--modern-primary);
    color: #fff;
    border-color: var(--modern-primary);
}

/* Quote Block */
.modern-post blockquote,
.modern-post .blockquote {
    padding: var(--modern-space-3) var(--modern-space-4);
    margin: var(--modern-space-4) 0;
    background: var(--modern-surface-secondary);
    border-left: 4px solid var(--modern-primary);
    border-radius: 0 var(--modern-radius-sm) var(--modern-radius-sm) 0;
    color: var(--modern-text-secondary);
    font-size: var(--modern-font-size-sm);
}

/* Code Block */
.modern-post pre,
.modern-post .blockcode {
    padding: var(--modern-space-4);
    margin: var(--modern-space-4) 0;
    background: var(--modern-surface-tertiary);
    border: 1px solid var(--modern-border-light);
    border-radius: var(--modern-radius-md);
    font-family: var(--modern-font-mono);
    font-size: var(--modern-font-size-sm);
    line-height: 1.6;
    overflow-x: auto;
}

/* Flash Notice */
.modern-flash-notice {
    display: flex;
    align-items: center;
    gap: var(--modern-space-3);
    padding: var(--modern-space-3) var(--modern-space-4);
    margin-bottom: var(--modern-space-4);
    border-radius: var(--modern-radius-md);
    font-size: var(--modern-font-size-sm);
    transition: all var(--modern-transition-base);
}
.modern-flash-notice--success {
    background: var(--modern-success-light);
    color: var(--modern-success);
    border: 1px solid rgba(34,197,94,0.2);
}
.modern-flash-notice--error {
    background: var(--modern-danger-light);
    color: var(--modern-danger);
    border: 1px solid rgba(239,68,68,0.2);
}
.modern-flash-notice--info {
    background: var(--modern-info-light);
    color: var(--modern-info);
    border: 1px solid rgba(59,130,246,0.2);
}
.modern-flash-notice__close {
    margin-left: auto;
    cursor: pointer;
    background: none;
    border: none;
    color: inherit;
    opacity: 0.7;
    padding: 2px;
    transition: opacity var(--modern-transition-fast);
}
.modern-flash-notice__close:hover { opacity: 1; }

/* Pagination */
.modern-pagination {
    display: flex;
    align-items: center;
    gap: var(--modern-space-1);
    justify-content: center;
    padding: var(--modern-space-5) 0;
}
.modern-pagination a,
.modern-pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 8px;
    font-size: var(--modern-font-size-sm);
    font-weight: 500;
    border-radius: var(--modern-radius-sm);
    text-decoration: none;
    transition: all var(--modern-transition-fast);
}
.modern-pagination a {
    color: var(--modern-text-secondary);
    background: var(--modern-surface);
    border: 1px solid var(--modern-border-light);
}
.modern-pagination a:hover {
    color: var(--modern-primary);
    background: var(--modern-primary-light);
    border-color: var(--modern-primary);
}
.modern-pagination span.current {
    color: #fff;
    background: var(--modern-primary);
    border-color: var(--modern-primary);
}
.modern-pagination .pgb a {
    color: var(--modern-text-secondary);
}