/* === common.css - viewing.cc shared styles ===
 * Design Philosophy: 紧凑实用、手工配色、小圆角/直角、轻阴影
 * See design-philosophy.md for full rationale.
 */

/* ===== CSS Variables ===== */
:root {
    /* 页面底色 - 带微弱暖相，绝不纯白 */
    --bg-color: #f3f2ef;
    --text-color: #333;
    --text-secondary: #666;

    /* 卡片/面板 - 与底色有清晰差 */
    --card-bg-color: #fafaf9;
    --card-text-color: #3a3a3a;

    /* 列表项底色 - 微妙暖灰 */
    --link-item-bg-color: #e9e8e5;
    --link-item-text-color: #333;
    --link-item-info-color: #595959;

    /* 强调色 - 低饱和蓝绿调 */
    --accent-color: #5a829a;
    --accent-hover: #4a728a;
    --accent-active: #3d6278;
    --accent-light: rgba(90, 130, 154, 0.12);

    /* 辅助强调色 - 偏绿青 */
    --accent2-color: #5a9a8a;
    --accent2-hover: #4a8a7a;

    /* 边框 - 柔和但清晰 */
    --border-color: #d5d3cf;
    --border-subtle: #e2e0dc;

    /* 输入框 */
    --input-bg: #fcfcfb;
    --input-text: #333;
    --input-border: #c5c3bf;

    /* 状态色 */
    --success-color: #5a8a6a;
    --danger-color: #a05050;
    --warning-color: #8a7a4a;
    --info-color: #5a829a;

    /* 表头底色 */
    --th-bg: #5a829a;

    /* Bit 状态色 */
    --bit-0-bg: #888;
    --bit-1-bg: #6a8cb0;

    /* 阴影 - 轻量，用于表意层次 */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.10);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);

    /* Header 工具按钮 */
    --waffle-btn-bg: #e9e8e5;
    --waffle-btn-border: #c5c3bf;

    /* 圆角 - 0~3px */
    --radius-sm: 2px;
    --radius: 3px;
    --radius-lg: 3px;

    /* 间距 - 4px 基准 */
    --sp-1: 4px;
    --sp-2: 6px;
    --sp-3: 10px;
    --sp-4: 14px;
    --sp-5: 18px;
    --sp-6: 22px;

    /* 过渡 */
    --transition-fast: 0.12s ease;
    --transition: 0.18s ease;

    /* 层级 */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-toast: 500;
    --z-tooltip: 600;
    --z-waffle: 700;
}

/* ===== Dark Mode ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1e1e1e;
        --text-color: #d0d0d0;
        --text-secondary: #999;
        --card-bg-color: #252526;
        --card-text-color: #d0d0d0;
        --link-item-bg-color: #2d2d30;
        --link-item-text-color: #c8c8c8;
        --link-item-info-color: #999;
        --accent-color: #6a9ab5;
        --accent-hover: #7aaaC5;
        --accent-active: #8ab8d0;
        --accent-light: rgba(106, 154, 181, 0.15);
        --accent2-color: #5a9a8a;
        --accent2-hover: #6aaa9a;
        --border-color: #3e3e42;
        --border-subtle: #333336;
        --input-bg: #333337;
        --input-text: #d0d0d0;
        --input-border: #454548;
        --success-color: #6a9a7a;
        --danger-color: #b06060;
        --warning-color: #9a8a5a;
        --info-color: #6a9ab5;
        --th-bg: #5a8a9a;
        --bit-0-bg: #666;
        --bit-1-bg: #5a8aa0;
        --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
        --shadow: 0 1px 3px rgba(0,0,0,0.2);
        --shadow-md: 0 2px 8px rgba(0,0,0,0.25);
        --shadow-lg: 0 4px 16px rgba(0,0,0,0.3);
        --waffle-btn-bg: #3a3a3e;
        --waffle-btn-border: #555;
    }
}

/* Override system dark mode when user explicitly chooses light mode */
html[data-theme="light"] {
    --bg-color: #f3f2ef;
    --text-color: #333;
    --text-secondary: #666;
    --card-bg-color: #fafaf9;
    --card-text-color: #3a3a3a;
    --link-item-bg-color: #e9e8e5;
    --link-item-text-color: #333;
    --link-item-info-color: #595959;
    --accent-color: #5a829a;
    --accent-hover: #4a728a;
    --accent-active: #3d6278;
    --accent-light: rgba(90, 130, 154, 0.12);
    --accent2-color: #5a9a8a;
    --accent2-hover: #4a8a7a;
    --border-color: #d5d3cf;
    --border-subtle: #e2e0dc;
    --input-bg: #fcfcfb;
    --input-text: #333;
    --input-border: #c5c3bf;
    --success-color: #5a8a6a;
    --danger-color: #a05050;
    --warning-color: #8a7a4a;
    --info-color: #5a829a;
    --th-bg: #5a829a;
    --bit-0-bg: #888;
    --bit-1-bg: #6a8cb0;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.10);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
    --waffle-btn-bg: #e9e8e5;
    --waffle-btn-border: #c5c3bf;
}

body.dark-mode {
    --bg-color: #1e1e1e;
    --text-color: #d0d0d0;
    --text-secondary: #999;
    --card-bg-color: #252526;
    --card-text-color: #d0d0d0;
    --link-item-bg-color: #2d2d30;
    --link-item-text-color: #c8c8c8;
    --link-item-info-color: #999;
    --accent-color: #6a9ab5;
    --accent-hover: #7aaaC5;
    --accent-active: #8ab8d0;
    --accent-light: rgba(106, 154, 181, 0.15);
    --accent2-color: #5a9a8a;
    --accent2-hover: #6aaa9a;
    --border-color: #3e3e42;
    --border-subtle: #333336;
    --input-bg: #333337;
    --input-text: #d0d0d0;
    --input-border: #454548;
    --success-color: #6a9a7a;
    --danger-color: #b06060;
    --warning-color: #9a8a5a;
    --info-color: #6a9ab5;
    --th-bg: #5a8a9a;
    --bit-0-bg: #666;
    --bit-1-bg: #5a8aa0;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
    --shadow: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.25);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.3);
    --waffle-btn-bg: #3a3a3e;
    --waffle-btn-border: #555;
}

/* ===== Reset ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'Microsoft YaHei', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
    padding: 10px 16px;
    background-color: var(--bg-color);
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition), color var(--transition);
}

.container {
    max-width: 100%;
    margin: 0 auto;
}

/* Viewport width override - applies when user selects a width mode */

/* Remove body horizontal padding so containers can expand to full viewport width.
   Each container already has its own padding for internal spacing. */
html[data-viewport-width] body {
    padding-left: 0 !important;
    padding-right: 0 !important;
}

/* Containers that have no built-in horizontal padding need side spacing
   now that body padding is removed. Use a low-specificity !important
   so page-level responsive rules can still override. */
html[data-viewport-width] .container,
html[data-viewport-width] .main,
html[data-viewport-width] .sudoku-container,
html[data-viewport-width] .editor-container,
html[data-viewport-width] .controls-container,
html[data-viewport-width] .table-container,
html[data-viewport-width] .player-container,
html[data-viewport-width] .top-nav-content {
    padding-left: 16px !important;
    padding-right: 16px !important;
}

html[data-viewport-width] .container,
html[data-viewport-width] .page-container,
html[data-viewport-width] .game-container,
html[data-viewport-width] .ascii-container,
html[data-viewport-width] .outer-container,
html[data-viewport-width] .main-container,
html[data-viewport-width] .main,
html[data-viewport-width] .pdf-counter-container,
html[data-viewport-width] .sudoku-container,
html[data-viewport-width] .editor-container,
html[data-viewport-width] .comparison-container,
html[data-viewport-width] .controls-container,
html[data-viewport-width] .chart-container,
html[data-viewport-width] .table-container,
html[data-viewport-width] .player-container,
html[data-viewport-width] .category-nav-container,
html[data-viewport-width] .top-nav-content,
html[data-viewport-width] .card,
html[data-viewport-width] footer,
html[data-viewport-width] .parser-footer,
html[data-viewport-width] .footer-info {
    max-width: var(--viewport-max-width, 100%) !important;
    margin-left: auto !important;
    margin-right: auto !important;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 5px 12px;
    font-size: 13px;
    font-weight: 500;
    line-height: 1.3;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    -webkit-user-select: none;
    background: var(--card-bg-color);
    color: var(--text-color);
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition-fast);
}

.btn:hover:not(:disabled) {
    transform: scale(1.04);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
    box-shadow: none;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

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

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

.btn-primary:active:not(:disabled) {
    background: var(--accent-active);
}

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

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

.btn-success { background: var(--success-color); color: #fff; border-color: var(--success-color); }
.btn-success:hover:not(:disabled) { filter: brightness(1.08); }

.btn-danger { background: var(--danger-color); color: #fff; border-color: var(--danger-color); }
.btn-danger:hover:not(:disabled) { filter: brightness(1.08); }

.btn-warning { background: var(--warning-color); color: #fff; border-color: var(--warning-color); }
.btn-warning:hover:not(:disabled) { filter: brightness(1.08); }

.btn-sm { padding: 3px 8px; font-size: 12px; }
.btn-lg { padding: 8px 16px; font-size: 15px; }
.btn-icon { padding: 4px; min-width: 28px; height: 28px; }
.btn-group { display: flex; gap: var(--sp-2); flex-wrap: wrap; align-items: center; }

/* ===== Form Elements ===== */
.form-group { margin-bottom: var(--sp-3); }

.form-label {
    display: block;
    margin-bottom: 4px;
    font-weight: 500;
    color: var(--text-color);
    font-size: 13px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 5px 8px;
    font-size: 14px;
    border: 1px 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;
    line-height: 1.5;
}

.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);
    opacity: 1;
}

.form-textarea { resize: vertical; min-height: 80px; }
.form-hint { font-size: 12px; color: var(--link-item-info-color); margin-top: 3px; }
.form-error { color: var(--danger-color); font-size: 12px; margin-top: 3px; }

/* ===== Cards ===== */
.card {
    background: var(--card-bg-color);
    border-radius: var(--radius);
    padding: var(--sp-3);
    box-shadow: var(--shadow-xs);
    border: 1px solid var(--border-subtle);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--sp-3);
    padding-bottom: var(--sp-2);
    border-bottom: 1px solid var(--border-color);
}

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

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

/* ===== Toast ===== */
.ui-toast-container {
    position: fixed;
    bottom: 12px;
    right: 12px;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: 6px;
    pointer-events: none;
}

.ui-toast {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--card-bg-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    font-size: 13px;
    color: var(--text-color);
    opacity: 0;
    transform: translateX(100%) translateY(0);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: auto;
    max-width: 320px;
    border: 1px solid var(--border-subtle);
}

.ui-toast-show { opacity: 1; transform: translateX(0) translateY(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, 0.35);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

.ui-loading-spinner { display: flex; gap: 5px; }
.ui-loading-dot {
    width: 8px;
    height: 8px;
    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: #eee; margin-top: 12px; font-size: 14px; }

/* ===== Confirm Dialog ===== */
.ui-confirm-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity 0.2s ease;
}

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

.ui-confirm-dialog {
    background: var(--card-bg-color);
    border-radius: var(--radius);
    min-width: 280px;
    max-width: 90vw;
    box-shadow: var(--shadow-md);
    transform: scale(0.95);
    transition: transform 0.2s ease;
    border: 1px solid var(--border-subtle);
    overflow: hidden;
}

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

.ui-confirm-header {
    padding: 12px 16px;
    font-weight: 600;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
}

.ui-confirm-body {
    padding: 12px 16px;
    color: var(--text-color);
    line-height: 1.6;
    font-size: 14px;
}

.ui-confirm-footer {
    padding: 8px 16px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-color);
}

.ui-confirm-btn {
    padding: 5px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background-color var(--transition), transform var(--transition-fast);
}

.ui-confirm-cancel { background: var(--link-item-bg-color); color: var(--text-color); }
.ui-confirm-cancel:hover { transform: scale(1.04); }
.ui-confirm-ok { background: var(--accent-color); color: #fff; border-color: var(--accent-color); }
.ui-confirm-ok:hover { background: var(--accent-hover); transform: scale(1.04); }
.ui-confirm-danger .ui-confirm-ok { background: var(--danger-color); border-color: var(--danger-color); }

/* ===== Search ===== */
.ui-search-container { position: relative; margin-bottom: 16px; }

.ui-search-input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    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 2px var(--accent-light);
}

.ui-search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--link-item-info-color);
    font-size: 14px;
    pointer-events: none;
}

.ui-search-clear {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--link-item-info-color);
    cursor: pointer;
    padding: 4px;
    font-size: 14px;
    display: none;
}

.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: 16px;
    height: 16px;
    padding: 0 5px;
    font-size: 10px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    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: 30px 16px;
    color: var(--link-item-info-color);
}

.ui-empty-state-icon { font-size: 40px; margin-bottom: 12px; opacity: 0.5; }
.ui-empty-state-text { font-size: 14px; }

/* ===== KBD ===== */
.ui-kbd {
    display: inline-block;
    padding: 1px 5px;
    font-family: monospace;
    font-size: 11px;
    background: var(--link-item-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--link-item-info-color);
    margin-left: 6px;
}

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

.ui-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    background: var(--text-color);
    color: var(--bg-color);
    font-size: 12px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    margin-bottom: 4px;
    z-index: var(--z-tooltip);
}

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

/* ===== Tabs ===== */
.ui-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
    gap: 2px;
}

.ui-tab {
    padding: 6px 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 13px;
    color: var(--link-item-info-color);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    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: 3px;
    background: var(--link-item-bg-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

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

/* ===== Divider ===== */
.ui-divider { height: 1px; background: var(--border-color); margin: 12px 0; }

.ui-divider-text {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--link-item-info-color);
    font-size: 12px;
    margin: 12px 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(8px); }
    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 0.2s ease; }
.ui-animate-slide-up { animation: ui-slide-up 0.2s 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: var(--sp-1); }
.mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); }
.mt-4 { margin-top: var(--sp-5); }

.mb-1 { margin-bottom: var(--sp-1); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-3 { margin-bottom: var(--sp-3); }
.mb-4 { margin-bottom: var(--sp-5); }

.p-1 { padding: var(--sp-1); }
.p-2 { padding: var(--sp-2); }
.p-3 { padding: var(--sp-3); }
.p-4 { padding: var(--sp-5); }

.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: var(--sp-1); }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== Focus Visible ===== */
.btn:focus-visible,
.ui-confirm-btn:focus-visible,
.ui-tab:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

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

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .ui-loading-dot { animation: none; opacity: 0.5; }
    .ui-loading-dot:nth-child(1) { opacity: 1; }
    .ui-loading-dot:nth-child(2) { opacity: 0.7; }
    .ui-loading-dot:nth-child(3) { opacity: 0.4; }
}

/* ================================================================
   Waffle Navigation - Google-style app launcher
   ================================================================ */

/* Waffle button - tiny, floating, adapts to page */
.waffle-btn {
    display: inline-flex;
    width: 28px;
    height: 28px;
    border: 1px solid var(--waffle-btn-border, var(--border-color));
    background: var(--waffle-btn-bg, var(--card-bg-color));
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 4px;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    transition: background-color var(--transition), box-shadow var(--transition), transform var(--transition-fast);
    flex-shrink: 0;
}

.waffle-btn:hover {
    background: var(--link-item-bg-color);
    box-shadow: var(--shadow-xs);
    transform: scale(1.08);
}

.waffle-btn:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.waffle-btn svg { display: block; }

/* Waffle container - holds the button, can be positioned anywhere */
.waffle-container {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.waffle-container--tr { position: fixed; top: 6px; right: 10px; z-index: var(--z-sticky); pointer-events: auto; }
.waffle-container--tl { position: fixed; top: 6px; left: 10px; z-index: var(--z-sticky); pointer-events: auto; }
.waffle-container--inline { display: inline-flex; }

/* Theme selector dropdown */
.ui-theme-wrapper {
    position: relative;
    display: inline-flex;
}

.ui-theme-menu {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 150px;
    padding: 4px;
    background: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: var(--z-dropdown);
}

.ui-theme-menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ui-theme-menu-item {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    padding: 6px 10px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
    text-align: left;
    white-space: nowrap;
    margin: 0;
}

.ui-theme-menu-item:hover {
    background: var(--link-item-bg-color);
}

.ui-theme-menu-item[data-active],
.ui-theme-menu-item.active,
.ui-theme-menu-item[data-theme][data-active="true"] {
    background: var(--accent-light);
    color: var(--accent-color);
}

.ui-theme-menu-item svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    opacity: 0.7;
}

.ui-theme-menu-item[data-active] svg,
.ui-theme-menu-item[data-theme][data-active="true"] svg {
    opacity: 1;
}

.ui-theme-hint {
    font-size: 11px;
    color: var(--text-secondary);
    margin-left: auto;
    padding-left: 8px;
}

.ui-theme-menu-item:hover .ui-theme-hint,
.ui-theme-menu-item[data-active] .ui-theme-hint {
    color: inherit;
}

/* Width selector dropdown */
.ui-width-wrapper {
    position: relative;
    display: inline-flex;
}

.ui-width-menu {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 130px;
    padding: 4px;
    background: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: var(--z-dropdown);
}

.ui-width-menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ui-width-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 6px 10px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
    text-align: left;
    white-space: nowrap;
    margin: 0;
}

.ui-width-menu-item:hover {
    background: var(--link-item-bg-color);
}

.ui-width-menu-item[data-width][data-active="true"] {
    background: var(--accent-light);
    color: var(--accent-color);
}

.ui-width-hint {
    font-size: 11px;
    color: var(--text-secondary);
    margin-left: 8px;
}

.ui-width-menu-item:hover .ui-width-hint,
.ui-width-menu-item[data-width][data-active="true"] .ui-width-hint {
    color: inherit;
}

/* Waffle overlay */
.waffle-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.25);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
    z-index: var(--z-waffle);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 60px;
}

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

/* Waffle panel */
.waffle-panel {
    background: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 480px;
    max-width: 92vw;
    max-height: 75vh;
    overflow-y: auto;
    padding: 10px;
    transform: translateY(-8px);
    transition: transform 0.2s ease;
}

.waffle-overlay.show .waffle-panel {
    transform: translateY(0);
}

/* Waffle search */
.waffle-search {
    padding: 4px 12px 6px;
    position: sticky;
    top: 0;
    background: var(--card-bg-color);
    z-index: 1;
}

.waffle-search-input {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: var(--input-bg);
    color: var(--input-text);
    outline: none;
}

.waffle-search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-light);
}

/* Waffle category */
.waffle-category {
    padding: 6px 4px 4px;
    font-size: 11px;
    font-weight: 600;
    color: var(--link-item-info-color);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Waffle grid section */
.waffle-grid-section {
    margin-bottom: 8px;
}

.waffle-grid-section.hidden {
    display: none !important;
}

/* Waffle grid */
.waffle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 4px;
}

/* Waffle grid item */
.waffle-grid-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 4px 8px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 11px;
    border-radius: var(--radius);
    transition: background-color var(--transition);
    text-align: center;
}

.waffle-grid-item:hover {
    background: var(--link-item-bg-color);
}

.waffle-grid-item.active {
    background: var(--accent-light);
    color: var(--accent-color);
    font-weight: 500;
}

.waffle-grid-item--home .waffle-grid-icon {
    background: var(--accent-color);
    color: #fff;
}

.waffle-grid-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    background: var(--link-item-bg-color);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    transition: background-color var(--transition);
}

.waffle-grid-icon svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.waffle-grid-item:hover .waffle-grid-icon {
    background: var(--accent-light);
    color: var(--accent-color);
}

.waffle-grid-label {
    display: block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: normal;
    line-height: 1.2;
}

.waffle-grid-item.hidden {
    display: none !important;
}

.waffle-divider {
    display: none;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    body { padding: 8px 10px; }

    .ui-toast-container {
        left: 8px;
        right: 8px;
        bottom: 8px;
    }

    .ui-toast { max-width: 100%; }

    .ui-confirm-dialog {
        min-width: auto;
        width: calc(100% - 24px);
    }

    .btn-lg {
        padding: 8px 14px;
        font-size: 14px;
    }

    .waffle-panel {
        width: 100%;
        max-width: 100%;
        max-height: 85vh;
        padding: 8px;
    }

    .waffle-overlay {
        align-items: flex-start;
        padding-top: 30px;
    }

    .waffle-grid {
        grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
    }
}