/* ===== Material Design 3 Community App Styles ===== */

/* ===== Design Tokens ===== */
:root {
    /* Primary */
    --md-primary: #6750A4;
    --md-on-primary: #FFFFFF;
    --md-primary-container: #EADDFF;
    --md-on-primary-container: #21005D;
    --md-primary-fixed: #EADDFF;
    --md-primary-fixed-dim: #D0BCFF;

    /* Secondary */
    --md-secondary: #625B71;
    --md-on-secondary: #FFFFFF;
    --md-secondary-container: #E8DEF8;
    --md-on-secondary-container: #1D192B;

    /* Tertiary */
    --md-tertiary: #7D5260;
    --md-on-tertiary: #FFFFFF;
    --md-tertiary-container: #FFD8E4;
    --md-on-tertiary-container: #31111D;

    /* Error */
    --md-error: #B3261E;
    --md-on-error: #FFFFFF;
    --md-error-container: #F9DEDC;
    --md-on-error-container: #410E0B;

    /* Surface */
    --md-surface: #FEF7FF;
    --md-surface-dim: #DED8E1;
    --md-surface-bright: #FEF7FF;
    --md-surface-container-lowest: #FFFFFF;
    --md-surface-container-low: #F7F2FA;
    --md-surface-container: #F3EDF7;
    --md-surface-container-high: #ECE6F0;
    --md-surface-container-highest: #E6E0E9;
    --md-on-surface: #1D1B20;
    --md-on-surface-variant: #49454F;
    --md-outline: #79747E;
    --md-outline-variant: #CAC4D0;

    /* Background */
    --md-background: #FEF7FF;
    --md-on-background: #1D1B20;
    --md-inverse-surface: #322F35;
    --md-inverse-on-surface: #F5EFF7;

    /* Elevation shadows */
    --md-elevation-1: 0 1px 2px 0 rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
    --md-elevation-2: 0 1px 2px 0 rgba(0,0,0,0.3), 0 2px 6px 2px rgba(0,0,0,0.15);
    --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px 0 rgba(0,0,0,0.3);

    /* Shape */
    --md-shape-xs: 4px;
    --md-shape-sm: 8px;
    --md-shape-md: 12px;
    --md-shape-lg: 16px;
    --md-shape-xl: 28px;
    --md-shape-full: 9999px;

    /* Typography */
    --md-font: 'Noto Sans SC', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Animation */
    --md-motion-standard: cubic-bezier(0.2, 0, 0, 1);
    --md-motion-emphasized: cubic-bezier(0.2, 0, 0, 1);

    /* Layout */
    --app-max-width: 600px;
    --bottom-nav-height: 64px;
    --top-app-bar-height: 56px;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
    :root {
        --md-primary: #D0BCFF;
        --md-on-primary: #381E72;
        --md-primary-container: #4F378B;
        --md-on-primary-container: #EADDFF;
        --md-secondary: #CCC2DC;
        --md-on-secondary: #332D41;
        --md-secondary-container: #4A4458;
        --md-on-secondary-container: #E8DEF8;
        --md-tertiary: #EFB8C8;
        --md-on-tertiary: #492532;
        --md-tertiary-container: #633B48;
        --md-on-tertiary-container: #FFD8E4;
        --md-error: #F2B8B5;
        --md-on-error: #601410;
        --md-error-container: #8C1D18;
        --md-on-error-container: #F9DEDC;
        --md-surface: #141218;
        --md-surface-dim: #141218;
        --md-surface-bright: #3B383E;
        --md-surface-container-lowest: #0F0D13;
        --md-surface-container-low: #1D1B20;
        --md-surface-container: #211F26;
        --md-surface-container-high: #2B2930;
        --md-surface-container-highest: #36343B;
        --md-on-surface: #E6E0E9;
        --md-on-surface-variant: #CAC4D0;
        --md-outline: #938F99;
        --md-outline-variant: #49454F;
        --md-background: #141218;
        --md-on-background: #E6E0E9;
        --md-inverse-surface: #E6E0E9;
        --md-inverse-on-surface: #322F35;
    }
}

/* ===== Reset ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    font-family: var(--md-font);
    background: var(--md-background);
    color: var(--md-on-background);
    font-size: 15px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { color: var(--md-primary); text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== App Container ===== */
#app {
    max-width: var(--app-max-width);
    margin: 0 auto;
    min-height: 100vh;
    position: relative;
    background: var(--md-surface);
}

/* ===== Top App Bar ===== */
.top-app-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--top-app-bar-height);
    background: var(--md-surface-container);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 8px;
    transition: background 0.3s;
}

.top-app-bar .title {
    flex: 1;
    font-size: 20px;
    font-weight: 500;
    color: var(--md-on-surface);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.top-app-bar .icon-btn {
    flex-shrink: 0;
}

/* ===== Icon Button ===== */
.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--md-shape-full);
    background: transparent;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    position: relative;
    overflow: hidden;
}

.icon-btn:hover { background: var(--md-surface-container-highest); }
.icon-btn:active { background: var(--md-surface-container-high); }

.icon-btn .material-icons,
.icon-btn .material-symbols-outlined {
    font-size: 24px;
}

/* ===== Bottom Navigation ===== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--app-max-width);
    height: var(--bottom-nav-height);
    background: var(--md-surface-container);
    display: flex;
    align-items: stretch;
    z-index: 100;
    box-shadow: 0 -1px 0 var(--md-outline-variant);
    padding-bottom: env(safe-area-inset-bottom);
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    border: none;
    background: transparent;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    transition: color 0.2s;
    position: relative;
    padding: 8px 0;
}

.bottom-nav-item.active {
    color: var(--md-on-surface);
}

.bottom-nav-item .nav-icon-wrapper {
    width: 64px;
    height: 32px;
    border-radius: var(--md-shape-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.bottom-nav-item.active .nav-icon-wrapper {
    background: var(--md-secondary-container);
}

.bottom-nav-item .material-icons,
.bottom-nav-item .material-symbols-outlined {
    font-size: 24px;
}

.bottom-nav-item .nav-label {
    font-size: 11px;
    font-weight: 500;
}

/* FAB center button */
.bottom-nav-item.fab-item .nav-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: var(--md-shape-md);
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    margin-top: -20px;
    box-shadow: var(--md-elevation-2);
}

.bottom-nav-item.fab-item.active .nav-icon-wrapper {
    background: var(--md-primary);
    color: var(--md-on-primary);
}

.bottom-nav-item.fab-item .nav-label {
    margin-top: 2px;
}

/* Badge */
.badge {
    position: absolute;
    top: 4px;
    right: 50%;
    transform: translateX(16px);
    min-width: 16px;
    height: 16px;
    border-radius: var(--md-shape-full);
    background: var(--md-error);
    color: var(--md-on-error);
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

/* ===== Content Area ===== */
.content {
    padding: 16px;
    padding-bottom: calc(var(--bottom-nav-height) + 32px);
}

.content-no-padding {
    padding-bottom: calc(var(--bottom-nav-height) + 16px);
}

/* ===== Cards (MD3) ===== */
.card {
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-md);
    overflow: hidden;
    transition: box-shadow 0.2s;
}

.card-elevated {
    box-shadow: var(--md-elevation-1);
}

.card-filled {
    background: var(--md-surface-container-highest);
}

.card-outlined {
    border: 1px solid var(--md-outline-variant);
}

.card-tappable {
    cursor: pointer;
}

.card-tappable:active {
    box-shadow: var(--md-elevation-1);
}

/* ===== Board Card (葫芦侠 style) ===== */
.board-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.board-card {
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-lg);
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s var(--md-motion-standard);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.board-card:active {
    transform: scale(0.97);
}

.board-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--board-color, var(--md-primary));
}

.board-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--md-shape-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--board-color, var(--md-primary-container));
    color: var(--md-on-primary-container);
}

.board-card-icon .material-icons,
.board-card-icon .material-symbols-outlined {
    font-size: 28px;
}

.board-card-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--md-on-surface);
}

.board-card-desc {
    font-size: 12px;
    color: var(--md-on-surface-variant);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.board-card-stats {
    display: flex;
    gap: 12px;
    font-size: 11px;
    color: var(--md-on-surface-variant);
}

.board-card-stats span {
    display: flex;
    align-items: center;
    gap: 2px;
}

/* ===== Category Section ===== */
.category-section {
    margin-bottom: 24px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    margin-bottom: 8px;
}

.category-header .cat-icon {
    font-size: 22px;
}

.category-header .cat-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--md-on-surface);
}

.category-header .cat-desc {
    font-size: 12px;
    color: var(--md-on-surface-variant);
    margin-left: auto;
}

/* ===== Thread List ===== */
.thread-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.thread-item {
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-md);
    padding: 14px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    gap: 12px;
}

.thread-item:active {
    transform: scale(0.99);
    background: var(--md-surface-container);
}

.thread-item .thread-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-full);
    background: var(--md-primary-container);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-on-primary-container);
    font-weight: 600;
    font-size: 16px;
    overflow: hidden;
}

.thread-item .thread-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.thread-item .thread-body {
    flex: 1;
    min-width: 0;
}

.thread-item .thread-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--md-on-surface);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.thread-item .thread-content {
    font-size: 13px;
    color: var(--md-on-surface-variant);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.thread-item .thread-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--md-on-surface-variant);
    flex-wrap: wrap;
}

.thread-item .thread-meta .meta-item {
    display: flex;
    align-items: center;
    gap: 2px;
}

.thread-item .thread-meta .meta-item .material-icons,
.thread-item .thread-meta .meta-item .material-symbols-outlined {
    font-size: 14px;
}

.thread-item .thread-tags {
    display: flex;
    gap: 4px;
    margin-bottom: 4px;
}

.tag-top {
    background: var(--md-error-container);
    color: var(--md-on-error-container);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: var(--md-shape-xs);
    font-weight: 600;
}

.tag-essence {
    background: var(--md-tertiary-container);
    color: var(--md-on-tertiary-container);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: var(--md-shape-xs);
    font-weight: 600;
}

.tag-board {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: var(--md-shape-xs);
    font-weight: 500;
}

/* Thread images */
.thread-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    margin: 8px 0;
    border-radius: var(--md-shape-sm);
    overflow: hidden;
}

.thread-images img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.thread-images.single img {
    aspect-ratio: 16/9;
    max-height: 200px;
}

/* ===== Level Badge ===== */
.level-badge {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: var(--md-shape-full);
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
    font-weight: 500;
}

/* ===== Buttons (MD3) ===== */
.btn {
    border: none;
    border-radius: var(--md-shape-full);
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--md-font);
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-filled {
    background: var(--md-primary);
    color: var(--md-on-primary);
}

.btn-filled:active { box-shadow: var(--md-elevation-1); }

.btn-tonal {
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
}

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

.btn-text {
    background: transparent;
    color: var(--md-primary);
    padding: 10px 12px;
}

.btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

.btn-block {
    width: 100%;
}

/* ===== Text Field (MD3) ===== */
.text-field {
    position: relative;
    margin-bottom: 16px;
}

.text-field input,
.text-field textarea {
    width: 100%;
    border: 1px solid var(--md-outline);
    border-radius: var(--md-shape-xs);
    padding: 14px 16px;
    font-size: 15px;
    font-family: var(--md-font);
    background: transparent;
    color: var(--md-on-surface);
    transition: border-color 0.2s;
    outline: none;
}

.text-field input:focus,
.text-field textarea:focus {
    border-color: var(--md-primary);
    border-width: 2px;
    padding: 13px 15px;
}

.text-field textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.6;
}

.text-field label {
    position: absolute;
    top: -8px;
    left: 12px;
    background: var(--md-surface);
    padding: 0 4px;
    font-size: 12px;
    color: var(--md-primary);
    pointer-events: none;
}

/* ===== FAB ===== */
.fab {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + 16px);
    right: 16px;
    width: 56px;
    height: 56px;
    border-radius: var(--md-shape-md);
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    border: none;
    cursor: pointer;
    box-shadow: var(--md-elevation-3);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 90;
    transition: all 0.2s;
}

.fab:active {
    transform: scale(0.95);
    box-shadow: var(--md-elevation-1);
}

/* ===== Chip (MD3) ===== */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--md-shape-sm);
    border: 1px solid var(--md-outline);
    background: transparent;
    color: var(--md-on-surface-variant);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.chip.active {
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
    border-color: transparent;
}

/* ===== Tab Bar ===== */
.tab-bar {
    display: flex;
    gap: 0;
    background: var(--md-surface-container);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    position: sticky;
    top: var(--top-app-bar-height);
    z-index: 90;
}

.tab-bar::-webkit-scrollbar { display: none; }

.tab-item {
    flex-shrink: 0;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    position: relative;
    white-space: nowrap;
    transition: color 0.2s;
    border: none;
    background: transparent;
}

.tab-item.active {
    color: var(--md-primary);
}

.tab-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 3px;
    border-radius: var(--md-shape-full);
    background: var(--md-primary);
}

/* ===== Post Item ===== */
.post-item {
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-md);
    padding: 14px;
    margin-bottom: 8px;
}

.post-item .post-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.post-item .post-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--md-shape-full);
    background: var(--md-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-on-primary-container);
    font-weight: 600;
    overflow: hidden;
    flex-shrink: 0;
}

.post-item .post-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-item .post-user-info {
    flex: 1;
    min-width: 0;
}

.post-item .post-username {
    font-size: 14px;
    font-weight: 500;
    color: var(--md-on-surface);
    display: flex;
    align-items: center;
    gap: 6px;
}

.post-item .post-meta {
    font-size: 12px;
    color: var(--md-on-surface-variant);
}

.post-item .post-content {
    font-size: 14px;
    color: var(--md-on-surface);
    line-height: 1.6;
    margin-bottom: 10px;
    white-space: pre-wrap;
    word-break: break-word;
}

.post-item .post-floor {
    font-size: 12px;
    color: var(--md-on-surface-variant);
    background: var(--md-surface-container-high);
    padding: 2px 8px;
    border-radius: var(--md-shape-full);
}

.post-item .post-actions {
    display: flex;
    gap: 16px;
    margin-top: 8px;
}

.post-action {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--md-shape-full);
    transition: background 0.2s;
    border: none;
    background: transparent;
}

.post-action:active { background: var(--md-surface-container-high); }
.post-action.liked { color: var(--md-primary); }

.post-action .material-icons,
.post-action .material-symbols-outlined {
    font-size: 18px;
}

/* ===== Profile ===== */
.profile-header {
    background: var(--md-surface-container);
    padding: 24px 16px;
    border-radius: 0 0 var(--md-shape-xl) var(--md-shape-xl);
    margin-bottom: 16px;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: var(--md-shape-full);
    background: var(--md-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-on-primary-container);
    font-size: 32px;
    font-weight: 600;
    margin: 0 auto 12px;
    overflow: hidden;
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-name {
    text-align: center;
    font-size: 20px;
    font-weight: 600;
    color: var(--md-on-surface);
    margin-bottom: 4px;
}

.profile-bio {
    text-align: center;
    font-size: 13px;
    color: var(--md-on-surface-variant);
    margin-bottom: 12px;
}

.profile-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-top: 16px;
}

.profile-stat {
    text-align: center;
}

.profile-stat .stat-value {
    font-size: 20px;
    font-weight: 600;
    color: var(--md-on-surface);
}

.profile-stat .stat-label {
    font-size: 12px;
    color: var(--md-on-surface-variant);
}

/* ===== List Item (MD3) ===== */
.list-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    cursor: pointer;
    transition: background 0.2s;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    color: var(--md-on-surface);
    font-family: var(--md-font);
    font-size: 14px;
}

.list-item:active { background: var(--md-surface-container-high); }

.list-item .list-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-full);
    background: var(--md-surface-container-highest);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-on-surface-variant);
    flex-shrink: 0;
}

.list-item .list-content {
    flex: 1;
    min-width: 0;
}

.list-item .list-title {
    font-size: 15px;
    font-weight: 500;
}

.list-item .list-subtitle {
    font-size: 13px;
    color: var(--md-on-surface-variant);
}

.list-item .list-trailing {
    color: var(--md-on-surface-variant);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--md-on-surface-variant);
}

.empty-state .material-icons,
.empty-state .material-symbols-outlined {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state .empty-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
}

.empty-state .empty-desc {
    font-size: 13px;
}

/* ===== Loading ===== */
.loading {
    display: flex;
    justify-content: center;
    padding: 24px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--md-surface-container-highest);
    border-top-color: var(--md-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== Snackbar ===== */
.snackbar {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + 16px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--md-inverse-surface);
    color: var(--md-inverse-on-surface);
    padding: 12px 16px;
    border-radius: var(--md-shape-xs);
    font-size: 14px;
    z-index: 200;
    box-shadow: var(--md-elevation-3);
    max-width: 90%;
    animation: snackbar-in 0.3s var(--md-motion-standard);
    pointer-events: none;
}

@keyframes snackbar-in {
    from { transform: translate(-50%, 100%); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

/* ===== Dialog (MD3) ===== */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 150;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    animation: fade-in 0.2s;
}

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

.dialog {
    background: var(--md-surface-container-high);
    border-radius: var(--md-shape-xl);
    padding: 24px;
    max-width: 400px;
    width: 100%;
    animation: dialog-in 0.3s var(--md-motion-emphasized);
}

@keyframes dialog-in {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.dialog-title {
    font-size: 22px;
    font-weight: 500;
    color: var(--md-on-surface);
    margin-bottom: 16px;
}

.dialog-content {
    font-size: 14px;
    color: var(--md-on-surface-variant);
    margin-bottom: 24px;
    line-height: 1.6;
}

.dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ===== Image Viewer ===== */
.image-viewer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.9);
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fade-in 0.2s;
}

.image-viewer img {
    max-width: 95%;
    max-height: 95%;
    object-fit: contain;
}

/* ===== Notification Item ===== */
.notification-item {
    display: flex;
    gap: 12px;
    padding: 14px;
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-md);
    margin-bottom: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.notification-item.unread {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
}

.notification-item .notif-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-full);
    background: var(--md-surface-container-high);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.notification-item .notif-body {
    flex: 1;
}

.notification-item .notif-content {
    font-size: 14px;
    margin-bottom: 4px;
}

.notification-item .notif-time {
    font-size: 12px;
    opacity: 0.7;
}

/* ===== Chat ===== */
.chat-bubble {
    max-width: 75%;
    padding: 10px 14px;
    border-radius: var(--md-shape-lg);
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 8px;
    word-break: break-word;
}

.chat-bubble.sent {
    background: var(--md-primary);
    color: var(--md-on-primary);
    margin-left: auto;
    border-bottom-right-radius: var(--md-shape-xs);
}

.chat-bubble.received {
    background: var(--md-surface-container-highest);
    color: var(--md-on-surface);
    border-bottom-left-radius: var(--md-shape-xs);
}

.chat-time {
    font-size: 11px;
    color: var(--md-on-surface-variant);
    text-align: center;
    margin: 8px 0;
}

/* ===== Search Bar ===== */
.search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--md-surface-container-high);
    border-radius: var(--md-shape-full);
    padding: 8px 16px;
    margin: 16px 0;
}

.search-bar input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 15px;
    color: var(--md-on-surface);
    outline: none;
    font-family: var(--md-font);
}

.search-bar input::placeholder {
    color: var(--md-on-surface-variant);
}

/* ===== Divider ===== */
.divider {
    height: 1px;
    background: var(--md-outline-variant);
    margin: 8px 0;
}

/* ===== Ripple effect ===== */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple-effect {
    position: absolute;
    border-radius: 50%;
    background: rgba(103, 80, 164, 0.15);
    transform: scale(0);
    animation: ripple 0.6s;
    pointer-events: none;
}

@keyframes ripple {
    to { transform: scale(4); opacity: 0; }
}

/* ===== Page transitions ===== */
.page {
    animation: page-in 0.3s var(--md-motion-standard);
}

@keyframes page-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Section header ===== */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0 8px;
}

.section-header .section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--md-on-surface);
}

.section-header .section-more {
    font-size: 13px;
    color: var(--md-primary);
    cursor: pointer;
}

/* ===== Hot list (首页热帖) ===== */
.hot-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hot-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-sm);
    cursor: pointer;
    transition: background 0.2s;
}

.hot-item:active { background: var(--md-surface-container); }

.hot-rank {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: var(--md-on-surface-variant);
    flex-shrink: 0;
}

.hot-rank.top-1 { color: #FF6B6B; }
.hot-rank.top-2 { color: #FFB84D; }
.hot-rank.top-3 { color: #4D96FF; }

.hot-title {
    flex: 1;
    font-size: 14px;
    color: var(--md-on-surface);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.hot-views {
    font-size: 12px;
    color: var(--md-on-surface-variant);
    flex-shrink: 0;
}

/* ===== Admin Panel ===== */
.admin-section {
    background: var(--md-surface-container-low);
    border-radius: var(--md-shape-md);
    padding: 16px;
    margin-bottom: 12px;
}

.admin-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--md-primary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.admin-table {
    width: 100%;
    font-size: 13px;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid var(--md-outline-variant);
}

.admin-table th {
    color: var(--md-on-surface-variant);
    font-weight: 500;
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.text-muted { color: var(--md-on-surface-variant); }
.text-sm { font-size: 13px; }
.text-xs { font-size: 12px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.hidden { display: none !important; }
.w-full { width: 100%; }
.rounded-full { border-radius: var(--md-shape-full); }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }