/* === common.css - viewing.cc shared styles === */

/* === 专业开发工具风格配色 - 低饱和度 ===
 * 参考: VSCode, Source Insight, STM32CubeMX
 * 特点: 低饱和度、高对比度、长时间使用不疲劳
 */

:root {
    /* 基础背景 */
    --bg-color: #f5f6f7;
    --text-color: #2d2d2d;
    
    /* 卡片/面板 */
    --card-bg-color: #ffffff;
    --card-text-color: #3a3a3a;
    
    /* 列表项背景 */
    --link-item-bg-color: #ececee;
    --link-item-text-color: #2d2d2d;
    --link-item-info-color: #6a6a6a;
    
    /* 强调色 - 低饱和度的蓝灰色 (VSCode风格) */
    --accent-color: #4a698a;
    --accent-hover: #3d5672;
    --accent-light: rgba(74, 105, 138, 0.1);
    
    /* 头部导航 */
    --header-bg: #ffffff;
    --header-text: #2d2d2d;
    
    /* 边框 */
    --border-color: #d4d5d6;
    
    /* 输入框 */
    --input-bg: #ffffff;
    --input-text: #2d2d2d;
    --input-border: #c0c1c2;
    
    /* 状态色 - 低饱和度版本 */
    --success-color: #4a7c5a;
    --danger-color: #a05050;
    --warning-color: #8a7a4a;
    --info-color: #4a698a;
    
    /* 阴影 - 更紧凑 */
    --shadow: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 2px 6px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 10px rgba(0,0,0,0.1);
    
    /* 圆角 - 小圆角更专业 */
    --radius-sm: 4px;
    --radius: 5px;
    --radius-lg: 6px;
    --transition: 0.12s ease;
}

/* === 暗黑模式 - VSCode Dark+ === */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1e1e1e;
        --text-color: #cccccc;
        --card-bg-color: #252526;
        --card-text-color: #cccccc;
        --link-item-bg-color: #2d2d30;
        --link-item-text-color: #bbbbbb;
        --link-item-info-color: #858585;
        --accent-color: #6a8cad;
        --accent-hover: #7d9dbe;
        --accent-light: rgba(106, 140, 173, 0.15);
        --header-bg: #252526;
        --header-text: #cccccc;
        --border-color: #3e3e42;
        --input-bg: #3c3c3c;
        --input-text: #cccccc;
        --input-border: #454545;
        --success-color: #5a8a6a;
        --danger-color: #b06060;
        --warning-color: #9a8a5a;
        --info-color: #6a8cad;
        --shadow: 0 1px 2px rgba(0,0,0,0.3);
        --shadow-md: 0 2px 6px rgba(0,0,0,0.35);
        --shadow-lg: 0 4px 10px rgba(0,0,0,0.4);
    }
}

body.dark-mode {
    --bg-color: #1e1e1e;
    --text-color: #cccccc;
    --card-bg-color: #252526;
    --card-text-color: #cccccc;
    --link-item-bg-color: #2d2d30;
    --link-item-text-color: #bbbbbb;
    --link-item-info-color: #858585;
    --accent-color: #6a8cad;
    --accent-hover: #7d9dbe;
    --accent-light: rgba(106, 140, 173, 0.15);
    --header-bg: #252526;
    --header-text: #cccccc;
    --border-color: #3e3e42;
    --input-bg: #3c3c3c;
    --input-text: #cccccc;
    --input-border: #454545;
    --success-color: #5a8a6a;
    --danger-color: #b06060;
    --warning-color: #9a8a5a;
    --info-color: #6a8cad;
    --shadow: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 2px 6px rgba(0,0,0,0.35);
    --shadow-lg: 0 4px 10px rgba(0,0,0,0.4);
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.2s, color 0.2s;
}

/* Header / Nav - 更紧凑 */
.header {
    background-color: var(--header-bg);
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.2s;
    border-bottom: 1px solid var(--border-color);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--accent-color);
    text-decoration: none;
    transition: opacity var(--transition);
}

.logo:hover {
    opacity: 0.8;
}

.header-title {
    font-size: 0.95em;
    color: var(--header-text);
    font-weight: 500;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.1em;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    transition: background-color 0.15s, transform var(--transition);
    color: var(--header-text);
}

.theme-toggle:hover {
    background-color: var(--link-item-bg-color);
    transform: scale(1.05);
}

/* Container - 更紧凑 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px;
}

/* Page Header - 统一页面头部（带汉堡菜单） */
.page-header {
    background: var(--header-bg);
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    gap: 12px;
}

.page-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.hamburger-btn {
    display: flex;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: var(--link-item-bg-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    justify-content: space-around;
    transition: background-color 0.15s;
}

.hamburger-btn:hover {
    background: var(--accent-light);
    border-color: var(--accent-color);
}

.hamburger-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-color);
    border-radius: 1px;
    transition: all 0.15s;
}

.page-title {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--accent-color);
    margin: 0;
    text-decoration: none;
}

.page-title:hover {
    opacity: 0.8;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 汉堡菜单下拉 */
.hamburger-menu {
    position: fixed;
    top: 52px;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--card-bg-color);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 200;
    overflow-y: auto;
    padding: 12px 0;
}

.hamburger-menu.open {
    transform: translateX(0);
}

.hamburger-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s;
    z-index: 150;
}

.hamburger-overlay.show {
    opacity: 1;
    visibility: visible;
}

.menu-category {
    padding: 8px 16px;
    font-size: 11px;
    font-weight: 600;
    color: var(--link-item-info-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.menu-item {
    display: block;
    padding: 10px 16px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.15s;
    border-left: 3px solid transparent;
}

.menu-item:hover {
    background: var(--link-item-bg-color);
    border-left-color: var(--accent-color);
}

.menu-item.active {
    background: var(--accent-light);
    color: var(--accent-color);
    border-left-color: var(--accent-color);
}

.menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
}

/* Responsive */
@media (max-width: 768px) {
    .header { padding: 8px 12px; }
    .header-title { display: none; }
    .container { padding: 12px; }
    .page-header { padding: 8px 12px; }
    .page-title { font-size: 1em; }
    .hamburger-btn { display: flex; }
}

/* === Buttons - 更紧凑 === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: var(--accent-color);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-success { background: var(--success-color); color: #fff; }
.btn-success:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }

.btn-danger { background: var(--danger-color); color: #fff; }
.btn-danger:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }

.btn-warning { background: var(--warning-color); color: #fff; }
.btn-warning:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }

.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 12px 20px; font-size: 15px; }
.btn-icon { padding: 6px; min-width: 32px; height: 32px; }
.btn-group { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }

.actions-bar {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 12px;
}

.form-row {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.form-row > * {
    flex: 1;
    min-width: 120px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--link-item-info-color);
}

/* === Form Elements - 更紧凑 === */
.form-group { margin-bottom: 12px; }

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-color);
    font-size: 13px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 8px 12px;
    font-size: 13px;
    border: 1.5px solid var(--input-border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--input-text);
    transition: border-color var(--transition), box-shadow var(--transition);
    font-family: inherit;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-light);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--link-item-info-color); }

.form-textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.5;
}

.form-hint { font-size: 11px; color: var(--link-item-info-color); margin-top: 3px; }
.form-error { color: var(--danger-color); font-size: 12px; }

/* === Cards - 更紧凑 === */
.card {
    background: var(--card-bg-color);
    border-radius: var(--radius-lg);
    padding: 14px;
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition), transform var(--transition);
}

.card-hover:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 15px;
    font-weight: 600;
    margin: 0;
    color: var(--text-color);
}

.card-body { color: var(--card-text-color); }

/* Category 分类卡片 */
.category {
    background: var(--card-bg-color);
    border-radius: var(--radius-lg);
    padding: 14px;
    margin-bottom: 12px;
    box-shadow: var(--shadow);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.category-title {
    margin: 0;
    color: var(--text-color);
    font-size: 14px;
    font-weight: 600;
}

.category-count {
    font-size: 11px;
    color: var(--link-item-info-color);
}

/* Link Item 链接卡片 */
.link-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--link-item-bg-color);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--link-item-text-color);
    transition: all var(--transition);
    margin-bottom: 6px;
}

.link-item:hover {
    background: var(--accent-light);
    transform: translateX(2px);
}

.link-item-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    flex-shrink: 0;
}

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

.link-item-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--link-item-text-color);
    margin: 0;
}

.link-item-desc {
    font-size: 11px;
    color: var(--link-item-info-color);
    margin: 2px 0 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* === UI Components - 紧凑版 === */

/* Toast */
.ui-toast-container {
    position: fixed;
    bottom: 16px;
    right: 16px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 6px;
    pointer-events: none;
}

.ui-toast {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--card-bg-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 13px;
    color: var(--text-color);
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.2s ease;
    pointer-events: auto;
    max-width: 300px;
}

.ui-toast-show { opacity: 1; transform: translateX(0); }
.ui-toast-icon { font-size: 14px; flex-shrink: 0; }
.ui-toast-success { border-left: 3px solid var(--success-color); }
.ui-toast-success .ui-toast-icon { color: var(--success-color); }
.ui-toast-error { border-left: 3px solid var(--danger-color); }
.ui-toast-error .ui-toast-icon { color: var(--danger-color); }
.ui-toast-warning { border-left: 3px solid var(--warning-color); }
.ui-toast-warning .ui-toast-icon { color: var(--warning-color); }
.ui-toast-info { border-left: 3px solid var(--accent-color); }
.ui-toast-info .ui-toast-icon { color: var(--accent-color); }

/* Loading Overlay */
.ui-loading-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(2px);
}

.ui-loading-spinner { display: flex; gap: 5px; }
.ui-loading-dot {
    width: 10px;
    height: 10px;
    background: var(--accent-color);
    border-radius: 50%;
    animation: ui-loading-bounce 1.4s infinite ease-in-out both;
}

.ui-loading-dot:nth-child(1) { animation-delay: -0.32s; }
.ui-loading-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes ui-loading-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.ui-loading-text {
    color: #fff;
    margin-top: 16px;
    font-size: 14px;
}

/* Confirm Dialog */
.ui-confirm-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.2s ease;
    backdrop-filter: blur(2px);
}

.ui-confirm-show { opacity: 1; }

.ui-confirm-dialog {
    background: var(--card-bg-color);
    border-radius: var(--radius-lg);
    min-width: 300px;
    max-width: 90vw;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: transform 0.2s ease;
}

.ui-confirm-show .ui-confirm-dialog { transform: scale(1); }

.ui-confirm-header {
    padding: 16px 20px;
    font-weight: 600;
    font-size: 16px;
    border-bottom: 1px solid var(--border-color);
}

.ui-confirm-body {
    padding: 20px;
    color: var(--text-color);
    line-height: 1.5;
}

.ui-confirm-footer {
    padding: 12px 20px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    border-top: 1px solid var(--border-color);
}

.ui-confirm-btn {
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    transition: all var(--transition);
}

.ui-confirm-cancel {
    background: var(--link-item-bg-color);
    color: var(--text-color);
}

.ui-confirm-cancel:hover { opacity: 0.8; }

.ui-confirm-ok {
    background: var(--accent-color);
    color: #fff;
}

.ui-confirm-ok:hover { background: var(--accent-hover); }

.ui-confirm-danger .ui-confirm-ok {
    background: var(--danger-color);
}

/* Search Input */
.ui-search-container {
    position: relative;
    margin-bottom: 20px;
}

.ui-search-input {
    width: 100%;
    padding: 12px 16px 12px 40px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 15px;
    background: var(--card-bg-color);
    color: var(--text-color);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.ui-search-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.ui-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--link-item-info-color);
    font-size: 16px;
    pointer-events: none;
}

.ui-search-clear {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--link-item-info-color);
    cursor: pointer;
    padding: 4px;
    font-size: 16px;
    display: none;
    transition: color var(--transition);
}

.ui-search-clear:hover { color: var(--text-color); }
.ui-search-input:not(:placeholder-shown) + .ui-search-icon + .ui-search-clear { display: block; }

/* Badge */
.ui-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 6px;
    font-size: 11px;
    font-weight: 600;
    border-radius: 9px;
    background: var(--accent-color);
    color: #fff;
}

.ui-badge-success { background: var(--success-color); }
.ui-badge-danger { background: var(--danger-color); }
.ui-badge-warning { background: var(--warning-color); color: #333; }

/* Empty State */
.ui-empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--link-item-info-color);
}

.ui-empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.ui-empty-state-text {
    font-size: 14px;
}

/* Keyboard Shortcut Hint */
.ui-kbd {
    display: inline-block;
    padding: 2px 6px;
    font-family: monospace;
    font-size: 11px;
    background: var(--link-item-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--link-item-info-color);
    margin-left: 8px;
}

/* Tooltip */
.ui-tooltip {
    position: relative;
}

.ui-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 10px;
    background: var(--text-color);
    color: var(--bg-color);
    font-size: 12px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    margin-bottom: 6px;
    z-index: 1000;
}

.ui-tooltip:hover::after { opacity: 1; }

/* Recent/Favorite Star */
.ui-star {
    cursor: pointer;
    font-size: 18px;
    color: var(--link-item-info-color);
    transition: color 0.2s ease, transform 0.2s ease;
    user-select: none;
}

.ui-star:hover { transform: scale(1.2); }
.ui-star.active { color: #fbbf24; }

/* === Tabs === */
.ui-tabs {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 16px;
    gap: 4px;
    overflow-x: auto;
}

.ui-tab {
    padding: 10px 16px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--link-item-info-color);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition);
    white-space: nowrap;
}

.ui-tab:hover {
    color: var(--text-color);
}

.ui-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

/* === Progress === */
.ui-progress {
    height: 4px;
    background: var(--link-item-bg-color);
    border-radius: 2px;
    overflow: hidden;
}

.ui-progress-bar {
    height: 100%;
    background: var(--accent-color);
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* === Divider === */
.ui-divider {
    height: 1px;
    background: var(--border-color);
    margin: 16px 0;
}

.ui-divider-text {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--link-item-info-color);
    font-size: 12px;
    margin: 16px 0;
}

.ui-divider-text::before,
.ui-divider-text::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

/* === Animations === */
@keyframes ui-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes ui-slide-up {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes ui-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.ui-animate-fade-in {
    animation: ui-fade-in 0.3s ease;
}

.ui-animate-slide-up {
    animation: ui-slide-up 0.3s ease;
}

.ui-animate-pulse {
    animation: ui-pulse 1.5s infinite;
}

/* === Utility Classes === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--link-item-info-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }
.mt-4 { margin-top: 24px; }

.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 24px; }

.p-1 { padding: 4px; }
.p-2 { padding: 8px; }
.p-3 { padding: 16px; }
.p-4 { padding: 24px; }

.d-flex { display: flex; }
.d-grid { display: grid; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 16px; }

.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Responsive */
@media (max-width: 768px) {
    .ui-toast-container {
        left: 20px;
        right: 20px;
        bottom: 20px;
    }
    
    .ui-toast {
        max-width: 100%;
    }
    
    .ui-confirm-dialog {
        min-width: auto;
        width: calc(100% - 40px);
    }
    
    .btn {
        padding: 8px 14px;
        font-size: 13px;
    }
    
    .btn-lg {
        padding: 12px 20px;
        font-size: 15px;
    }
}