/* ========== 基础样式变量 ========== */
:root {
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --glass-bg: rgba(0, 0, 0, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.28);
    --glass-shadow-hover: 0 12px 38px rgba(0, 0, 0, 0.35);
    --glass-blur: blur(15px) saturate(1.1);
    --hover-bg: rgba(255, 255, 255, 0.12);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 16px;
    --radius-sm: 10px;
    --default-dark-gradient: linear-gradient(0deg, #232323 0%, #555555 50%, #878787 100%);
    --default-light-gradient: linear-gradient(180deg, #fafafa 0%, #c8c8c8 50%, #969696 100%);
    --before-opacity: 1;
    --default-gradient: var(--default-dark-gradient);
    --selected-bg: rgba(255, 255, 255, 0.85);
    --selected-text-color: #000000;
    --fallback-char-color: #ffffff;
    --modal-overlay-bg: rgba(0, 0, 0, 0.6);
    --modal-bg: rgba(70, 70, 70, 0.6);
    --modal-border: rgba(255, 255, 255, 0.2);
    --modal-btn-bg: rgba(255, 255, 255, 0.12);
    --modal-btn-hover-bg: rgba(255, 255, 255, 0.22);
    --delete-zone-bg: rgba(255, 0, 0, 0.3);
    --delete-zone-border: rgba(255, 0, 0, 0.6);
    --menu-shadow-strong: 0 20px 60px rgba(0, 0, 0, 0.5);
    --flow-duration: 9s;
}

/* 浅色主题变量覆盖 */
body.theme-light {
    --text-primary: #1a1a1a;
    --text-secondary: rgba(0, 0, 0, 0.8);
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    --glass-shadow-hover: 0 12px 38px rgba(0, 0, 0, 0.22);
    --hover-bg: rgba(0, 0, 0, 0.06);
    --default-gradient: var(--default-light-gradient);
    --selected-bg: rgba(0, 0, 0, 0.8);
    --selected-text-color: #ffffff;
    --fallback-char-color: #000000;
    --modal-overlay-bg: rgba(0, 0, 0, 0.5);
    --modal-bg: rgba(255, 255, 255, 0.6);
    --modal-border: rgba(0, 0, 0, 0.15);
    --modal-btn-bg: rgba(0, 0, 0, 0.06);
    --modal-btn-hover-bg: rgba(0, 0, 0, 0.12);
    --delete-zone-bg: rgba(255, 0, 0, 0.25);
    --delete-zone-border: rgba(255, 0, 0, 0.5);
}

/* ========== 基础 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}

body {
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
        'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    position: relative;
    user-select: none;
    transition: background-image 0.8s ease, color 0.3s ease;
    touch-action: none;
    overscroll-behavior: none;
    isolation: isolate;
}

body.keyboard-open {
    overflow: hidden !important;
    position: fixed !important;
    width: 100% !important;
    height: 100% !important;
    top: 0 !important;
    left: 0 !important;
    bottom: auto !important;
    right: auto !important;
    background-attachment: fixed !important;
}
body.keyboard-open .settings-panel {
    max-height: calc(100vh - 120px);
}

/* ===== 背景伪元素（动态渐变 + 无缝双向流动动画） ===== */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -2;
    background-size: 100% 200%;
    background-position: 0% 0%;
    animation: flowBg var(--flow-duration, 9s) ease-in-out infinite alternate;
    opacity: var(--before-opacity, 1);
    transition: background-image 0.8s ease, opacity 0.6s ease;
    will-change: background-position;
}

body.has-custom-bg::before {
    background-image: none !important;
    background-size: auto;
    animation: none;
    opacity: 0.3;
}

@keyframes flowBg {
    0% { background-position: 0% 0%; }
    100% { background-position: 0% 100%; }
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 0.8s ease;
    pointer-events: none;
}

body.has-custom-bg::after {
    opacity: 1;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

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

/* ========== 主布局 ========== */
.main-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.2rem;
    width: 100%;
    max-width: 748px;
    padding: 2rem;
    z-index: 1;
    animation: fadeInUp 1s ease both;
    margin-top: -10vh;
    transition: margin-top 0.3s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(35px); }
    to { opacity: 1; transform: translateY(0); }
}
.main-center.animation-done {
    animation: none !important;
    transform: none !important;
}

/* ========== 时钟 ========== */
.clock-section {
    text-align: center;
    color: var(--text-primary);
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.clock-section.hidden {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
    height: 0;
    margin: 0;
    overflow: hidden;
}
.time {
    font-size: 4.2rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    line-height: 1;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}
.date {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    letter-spacing: 0.12em;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
}

/* ========== 搜索包装器 ========== */
.search-wrapper {
    width: 100%;
    position: relative;
    z-index: 10;
}

.search-box-container {
    position: relative;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    z-index: 20;
    transition: opacity 0.3s ease, transform 0.3s ease, max-height 0.3s ease;
}
.search-box-container.hidden {
    opacity: 0;
    transform: scale(0.95);
    max-height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    pointer-events: none;
}

/* ==========搜索框========== */
.search-box {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    /* 移除 backdrop-filter，仅在聚焦时应用 */
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
    transition: var(--transition);
    position: relative;
    overflow: visible;
    z-index: 1;
    padding: 0.5rem 0.7rem;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style;
}
.search-box:focus-within {
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--glass-shadow-hover);
}
.search-box:hover {
    box-shadow: var(--glass-shadow-hover);
}

.engine-toggle {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.7rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    background: transparent;
    border: none;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
    position: relative;
    touch-action: manipulation;
}
.engine-toggle:hover {
    background: var(--hover-bg);
    transform: scale(1.03);
}
.engine-toggle:active {
    transform: scale(0.96);
}

.engine-logo-badge {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
    background: transparent;
    overflow: hidden;
}
.engine-logo-badge img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
    display: block;
    pointer-events: none;
}
.engine-logo-badge .fallback-text {
    display: none;
    font-size: 1rem;
    font-weight: 700;
    color: var(--fallback-char-color);
}

.engine-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: 0.03em;
    white-space: nowrap;
    transition: var(--transition);
    display: none !important;
}
.engine-caret {
    width: 15px;
    height: 15px;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}
.engine-toggle.menu-open .engine-caret {
    transform: rotate(180deg);
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    padding: 0.75rem 0.4rem;
    letter-spacing: 0.02em;
    font-weight: 400;
    min-width: 0;
}
.search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
    font-weight: 300;
    letter-spacing: 0.04em;
    transition: var(--transition);
}
.search-input:focus::placeholder {
    opacity: 0.4;
    transform: translateX(5px);
}

.search-submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
    margin-left: 0.25rem;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.search-submit-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    transform: scale(1.05);
}
.search-submit-btn:active {
    transform: scale(0.95);
}
.search-submit-btn svg {
    width: 20px;
    height: 20px;
}

/* ==========搜索引擎菜单========== */
.engine-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 220px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
    transition: background 0.6s ease, opacity 0.25s ease, visibility 0.25s ease;
    z-index: 99999;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    touch-action: pan-y;
    will-change: opacity, visibility, transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    contain: layout style;
}
.engine-menu.show {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
}

.engine-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.9rem;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.92rem;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    position: relative;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}
.engine-menu-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    transform: translateX(4px);
}
.engine-menu-item.active {
    background: var(--selected-bg);
    color: var(--selected-text-color);
    font-weight: 500;
}
.engine-menu-item .mini-logo {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: transparent;
    overflow: hidden;
}
.engine-menu-item .mini-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 6px;
    display: block;
    pointer-events: none;
}
.engine-menu-item .mini-logo .fallback-text {
    display: none;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--fallback-char-color);
}
.engine-menu-item .check-mark {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid currentColor;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
    opacity: 0;
    transition: var(--transition);
    flex-shrink: 0;
    margin-left: auto;
}
.engine-menu-item.active .check-mark {
    opacity: 1;
    background: currentColor;
    border-color: currentColor;
}

/* ==========设置面板和语言菜单========== */
.settings-panel,
.language-menu {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
    transition: background 0.6s ease, opacity 0.25s ease, transform 0.25s ease;
    z-index: 9999;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    touch-action: pan-y;
    will-change: transform, opacity;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style;
}

.settings-panel {
    position: fixed;
    top: 5.2rem;
    right: 1.5rem;
    min-width: 240px;
    max-height: 70vh;
    overflow-y: auto;
    padding: 0.6rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px) scale(0.98);
}
.settings-panel.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.language-menu {
    position: fixed;
    top: 5.2rem;
    right: 1.5rem;
    min-width: 160px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px) scale(0.98);
}
.language-menu.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.language-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.9rem;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.92rem;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    position: relative;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}
.language-menu-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    transform: translateX(4px);
}
.language-menu-item.active {
    background: var(--selected-bg);
    color: var(--selected-text-color);
    font-weight: 500;
}

/* ==========右上角按钮========== */
.top-right-controls {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 200;
}

.language-btn,
.settings-btn {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: none;
    box-shadow: var(--glass-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    outline: none;
    -webkit-tap-highlight-color: transparent;
    transform: translateZ(0);
    backface-visibility: hidden;
    will-change: transform;
    contain: layout style;
    touch-action: manipulation;
}
.language-btn:hover,
.settings-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    box-shadow: var(--glass-shadow-hover);
    transform: scale(1.05);
}
.language-btn:active,
.settings-btn:active {
    transform: scale(0.95);
}
.language-btn {
    font-size: 1.1rem;
    font-weight: 600;
}
.settings-btn svg {
    width: 22px;
    height: 22px;
}

/* ========== 设置面板内部 ========== */
.settings-panel-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 0.9rem;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    letter-spacing: 0.02em;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
    touch-action: manipulation;
    min-height: 44px;
}
.settings-panel-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    transform: translateX(4px);
}
.settings-panel-item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}
.settings-submenu {
    padding-left: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, opacity 0.3s ease;
    opacity: 0;
}
.settings-submenu.open {
    max-height: 400px;
    opacity: 1;
}

.settings-submenu-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.8rem;
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.82rem;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    min-height: 40px;
    transition: var(--transition);
    cursor: pointer;
}
.settings-submenu-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    transform: translateX(4px);
}

.settings-submenu-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

#iconListContainer .settings-submenu-item {
    cursor: default;
}
#iconListContainer .settings-submenu-item:hover {
    background: transparent;
    color: var(--text-secondary);
    transform: none;
}

.settings-submenu-item .sort-btn,
.settings-submenu-item .delete-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    font-size: 0.9rem;
    line-height: 1;
    border-radius: 4px;
    transition: var(--transition);
    color: var(--text-secondary);
    touch-action: manipulation;
    min-width: 28px;
    text-align: center;
}
.settings-submenu-item .sort-btn:hover:not(:disabled) {
    background: var(--hover-bg);
    color: var(--text-primary);
}
.settings-submenu-item .sort-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}
.settings-submenu-item .delete-btn {
    color: #ff4444;
    font-weight: 700;
}
.settings-submenu-item .delete-btn:hover {
    background: rgba(255, 68, 68, 0.15);
    color: #ff2222;
}

.settings-divider {
    height: 1px;
    background: var(--modal-border);
    margin: 0.3rem 0;
    flex-shrink: 0;
    opacity: 0.4;
}

.quick-link-form {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.5rem 0.3rem;
}
.quick-link-form input {
    background: rgba(255, 255, 255, 0.08);
    border: none;
    border-radius: 6px;
    padding: 0.5rem 0.7rem;
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
    letter-spacing: 0.02em;
}
.quick-link-form input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}
.quick-link-form input:focus {
    background: rgba(255, 255, 255, 0.15);
}
.quick-link-form button {
    background: rgba(255, 255, 255, 0.08);
    border: none;
    border-radius: 6px;
    padding: 0.5rem;
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    letter-spacing: 0.03em;
    touch-action: manipulation;
}
.quick-link-form button:hover {
    background: rgba(255, 255, 255, 0.16);
    transform: translateY(-1px);
}

#iconListContainer {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    max-height: 200px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    touch-action: pan-y;
}

/* ==========快捷图标样式========== */
.quick-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    justify-content: center;
    margin-top: 0.8rem;
    min-height: 0;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
    contain: layout;
}
.quick-links:empty {
    display: none;
}

.quick-link-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: none;
    border-radius: 14px;
    padding: 0.7rem 0.4rem;
    width: 72px;
    flex: 0 0 auto;
    transition: var(--transition), transform 0.25s cubic-bezier(0.2, 0, 0, 1);
    box-shadow: var(--glass-shadow);
    position: relative;
    text-decoration: none;
    color: var(--text-primary);
    z-index: 1;
    -webkit-user-drag: element;
    user-select: none;
    transform: translateZ(0);
    backface-visibility: hidden;
    will-change: transform;
    contain: layout style;
}
.quick-link-item:hover {
    background: var(--hover-bg);
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--glass-shadow-hover);
}
.quick-link-item:active {
    transform: translateY(0) scale(0.95);
}
.quick-link-item.dragging {
    opacity: 0.4;
    transform: scale(0.95);
}
.quick-link-item.drag-over {
    outline: 2px solid var(--selected-bg);
    outline-offset: -2px;
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.quick-link-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    overflow: hidden;
    background: transparent;
    flex-shrink: 0;
    position: relative;
    pointer-events: none;
}
.quick-link-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 10px;
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    display: block;
}
.quick-link-icon .fallback-char {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 0;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--fallback-char-color);
    pointer-events: none;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    display: none;
}
.quick-link-icon.fallback .fallback-char {
    display: block;
}
.quick-link-icon.fallback {
    background: rgba(0, 0, 0, 0.25);
}
.quick-link-name {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    max-width: 64px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    pointer-events: none;
    line-height: 1.2;
}

.drop-placeholder {
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.15);
    transition: all 0.2s ease;
    flex-shrink: 0;
    width: 72px;
    height: 90px;
}

/* ========== 提示框 ========== */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    letter-spacing: 0.03em;
    box-shadow: var(--glass-shadow);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s ease;
    opacity: 0;
    z-index: 500;
    pointer-events: none;
    white-space: nowrap;
    transform: translateX(-50%) translateY(100px);
    will-change: transform, opacity;
    contain: layout style;
}
.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ==========关于模态框========== */
.about-modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.about-modal-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.about-modal {
    background: var(--modal-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--modal-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow-hover);
    padding: 2rem 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
    max-width: 400px;
    width: 90%;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    will-change: transform;
    contain: layout style;
}
.about-modal-overlay.show .about-modal {
    transform: translateY(0);
}
.about-modal img.favicon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    object-fit: contain;
}
.about-modal-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}
.about-modal-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}
.about-modal-link,
.about-modal-close-btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    background: var(--modal-btn-bg);
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    touch-action: manipulation;
}
.about-modal-link:hover,
.about-modal-close-btn:hover {
    background: var(--modal-btn-hover-bg);
    transform: translateY(-2px);
}

/* ========== 删除区 ========== */
#deleteZone {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 60px;
    background: var(--delete-zone-bg);
    backdrop-filter: blur(10px) saturate(1.1);
    -webkit-backdrop-filter: blur(10px) saturate(1.1);
    border: 2px dashed var(--delete-zone-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    will-change: opacity;
    contain: layout style;
}
#deleteZone.show {
    opacity: 1;
    pointer-events: auto;
}
#deleteZone.drag-over {
    background: rgba(255, 0, 0, 0.6);
}

/* ========== 滚动条 ========== */
.settings-panel::-webkit-scrollbar,
.settings-submenu::-webkit-scrollbar,
#iconListContainer::-webkit-scrollbar,
.engine-menu::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
.settings-panel::-webkit-scrollbar-track,
.settings-submenu::-webkit-scrollbar-track,
#iconListContainer::-webkit-scrollbar-track,
.engine-menu::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    margin: 4px 0;
}
.settings-panel::-webkit-scrollbar-thumb,
.settings-submenu::-webkit-scrollbar-thumb,
#iconListContainer::-webkit-scrollbar-thumb,
.engine-menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    transition: background 0.2s;
}
.settings-panel::-webkit-scrollbar-thumb:hover,
.settings-submenu::-webkit-scrollbar-thumb:hover,
#iconListContainer::-webkit-scrollbar-thumb:hover,
.engine-menu::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.35);
}
.settings-panel,
.settings-submenu,
#iconListContainer,
.engine-menu {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) rgba(255, 255, 255, 0.05);
}

/* ========== 移动端适配 ========== */
@media (max-width: 600px) {
    .main-center {
        padding: 1.2rem;
        gap: 1.5rem;
        margin-top: -5vh;
        transition: margin-top 0.25s ease;
    }
    .main-center.search-focused {
        margin-top: -25vh;
    }
    .time {
        font-size: 2.8rem;
    }
    .date {
        font-size: 0.9rem;
    }
    .search-input {
        font-size: 0.95rem;
        padding: 0.6rem 0.3rem;
    }
    .engine-toggle {
        padding: 0.3rem 0.5rem;
        gap: 0.4rem;
    }
    .engine-logo-badge {
        width: 26px;
        height: 26px;
    }
    .engine-label {
        font-size: 0.8rem;
    }
    .engine-caret {
        width: 11px;
        height: 11px;
    }
    .top-right-controls {
        top: 1rem;
        right: 1rem;
        gap: 0.5rem;
    }
    .settings-btn,
    .language-btn {
        width: 40px;
        height: 40px;
    }
    .settings-btn svg {
        width: 18px;
        height: 18px;
    }
    .language-btn {
        font-size: 0.95rem;
    }
    .search-submit-btn {
        width: 36px;
        height: 36px;
    }
    .search-submit-btn svg {
        width: 18px;
        height: 18px;
    }
    .settings-panel {
        top: 4.5rem;
        right: 1rem;
        min-width: 170px;
        max-height: calc(100vh - 100px);
        padding: 0.5rem;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
        touch-action: pan-y;
    }
    .settings-panel-item {
        padding: 0.5rem 0.7rem;
        font-size: 0.8rem;
        min-height: 38px;
    }
    .settings-panel-item svg {
        width: 16px;
        height: 16px;
    }
    .settings-submenu-item {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
        min-height: 34px;
    }
    .language-menu {
        top: 4.5rem;
        right: 1rem;
        min-width: 140px;
    }
    .quick-link-item {
        width: 64px;
        padding: 0.5rem 0.2rem;
    }
    .quick-link-icon {
        width: 32px;
        height: 32px;
        font-size: 1.1rem;
    }
    .quick-link-name {
        font-size: 0.6rem;
        max-width: 56px;
    }
    .drop-placeholder {
        width: 64px;
        height: 80px;
    }
    .toast {
        font-size: 0.8rem;
        padding: 0.6rem 1.1rem;
        bottom: 1.2rem;
    }
    .engine-menu {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%) scale(0.98);
        min-width: 200px;
        max-width: 90vw;
        max-height: 70vh;
        overflow-y: auto;
        z-index: 99999;
        border-radius: var(--radius);
        box-shadow: var(--menu-shadow-strong);
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
        touch-action: pan-y;
        margin-top: 0;
        top: 50%;
        left: 50%;
        bottom: auto;
        padding: 0.6rem;
    }
    .engine-menu.show {
        transform: translate(-50%, -50%) scale(1);
    }
    .engine-menu-item {
        padding: 0.7rem 0.9rem;
        font-size: 0.9rem;
        min-height: 46px;
        gap: 0.8rem;
        border-radius: 10px;
    }
    .about-modal {
        padding: 1.5rem 1.8rem;
        gap: 1rem;
    }
    .about-modal img.favicon {
        width: 50px;
        height: 50px;
    }
}

@media (max-width: 380px) {
    .time {
        font-size: 2.2rem;
    }
    .engine-label {
        font-size: 0.7rem;
    }
    .engine-logo-badge {
        width: 22px;
        height: 22px;
    }
    .search-box {
        border-radius: 14px;
        padding: 0.2rem 0.4rem;
    }
    .search-submit-btn {
        width: 32px;
        height: 32px;
    }
    .search-submit-btn svg {
        width: 16px;
        height: 16px;
    }
    .settings-panel {
        max-height: calc(100vh - 80px);
        min-width: 150px;
    }
    .quick-link-item {
        width: 58px;
        padding: 0.4rem 0.1rem;
    }
    .quick-link-name {
        font-size: 0.55rem;
        max-width: 50px;
    }
    .drop-placeholder {
        width: 58px;
        height: 72px;
    }
    .engine-menu-item {
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
        min-height: 42px;
    }
}