/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 */
:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --error-color: #FF3B30;
    --background-color: #F2F2F7;
    --surface-color: #FFFFFF;
    --text-primary: #1C1C1E;
    --text-secondary: #8E8E93;
    --border-color: #E5E5EA;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 16px;
    --border-radius-small: 8px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --search-sticky-offset: 0px;
    --search-fixed-top: var(--spacing-sm);
}

body.theme-light {
    --background-color: #F2F2F7;
    --surface-color: #FFFFFF;
    --text-primary: #1C1C1E;
    --text-secondary: #8E8E93;
    --border-color: #E5E5EA;
}

body.theme-dark {
    --background-color: #000000;
    --surface-color: #1C1C1E;
    --text-primary: #FFFFFF;
    --text-secondary: #8E8E93;
    --border-color: #38383A;
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    min-height: 100vh;
}

.dock {
    position: fixed;
    top: 32px;
    bottom: 32px;
    left: 32px;
    transform: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 18px;
    padding: 16px 10px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 18px;
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    z-index: 40;
}

.user-panel {
    position: fixed;
    right: 32px;
    bottom: 32px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    z-index: 40;
}

.user-panel .user-area {
    position: relative;
}

.utility-button {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    background: rgba(0, 122, 255, 0.1);
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.18);
    border: none;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    position: relative;
    padding: 0;
}

.utility-button:focus-visible {
    outline: 3px solid rgba(0, 122, 255, 0.35);
    outline-offset: 4px;
}

.utility-button .utility-icon {
    width: 22px;
    height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.utility-button .utility-icon svg {
    width: 100%;
    height: 100%;
    overflow: visible;
}

.utility-button.back-to-top {
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
}

.utility-button.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.utility-button.theme-toggle {
    overflow: hidden;
}

.utility-button.theme-toggle .icon-sun,
.utility-button.theme-toggle .icon-moon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity 0.2s ease;
}

.utility-button.theme-toggle .icon-moon {
    opacity: 0;
}

.utility-button.theme-toggle[data-theme="dark"] .icon-moon {
    opacity: 1;
}

.utility-button.theme-toggle[data-theme="dark"] .icon-sun {
    opacity: 0;
}

.utility-button.theme-toggle[data-theme="light"] .icon-sun {
    opacity: 1;
}

.utility-button.theme-toggle[data-theme="light"] .icon-moon {
    opacity: 0;
}

.utility-button.feedback {
    background: rgba(255, 149, 0, 0.12);
    color: #FF9500;
    box-shadow: 0 6px 16px rgba(255, 149, 0, 0.18);
}

@media (hover: hover) {
    .utility-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 18px 40px rgba(0, 122, 255, 0.24);
    }

    .utility-button.feedback:hover {
        box-shadow: 0 18px 40px rgba(255, 149, 0, 0.28);
    }
}

.dock-item {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    background: rgba(0, 122, 255, 0.1);
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.18);
    transition: transform 0.22s cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 0.22s ease,
        background 0.22s ease;
    will-change: transform;
    position: relative;
    transform: translateX(0) scale(1);
    transform-origin: center;
}

.dock-item:focus-visible {
    outline: 3px solid rgba(0, 122, 255, 0.35);
    outline-offset: 4px;
}

.dock-item::after {
    content: attr(data-label);
    position: absolute;
    left: 60px;
    top: 50%;
    transform: translateY(-50%) translateX(-8px);
    padding: 4px 8px;
    background: rgba(44, 44, 46, 0.85);
    color: #fff;
    border-radius: 999px;
    font-size: 0.75rem;
    letter-spacing: 0.02em;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.dock-item:hover::after,
.dock-item:focus-visible::after {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.dock-icon svg {
    width: 22px;
    height: 22px;
    display: block;
    transition: transform 0.22s ease;
}

.dock-icon img {
    width: 22px;
    height: 22px;
    display: block;
    transition: transform 0.22s ease;
}

@media (hover: hover) {
    .dock-item:hover {
        background: rgba(0, 122, 255, 0.18);
        box-shadow: 0 18px 40px rgba(0, 122, 255, 0.24);
    }
}

body.theme-dark .dock {
    background: rgba(44, 44, 46, 0.6);
    border: 1px solid rgba(72, 72, 74, 0.6);
}

body.theme-dark .dock-item {
    background: rgba(10, 132, 255, 0.18);
    box-shadow: 0 10px 24px rgba(10, 132, 255, 0.24);
    color: #0A84FF;
}

body.theme-dark .utility-button {
    background: rgba(10, 132, 255, 0.18);
    box-shadow: 0 10px 24px rgba(10, 132, 255, 0.24);
    color: #0A84FF;
}

body.theme-dark .utility-button.feedback {
    background: rgba(255, 159, 10, 0.18);
    color: #FF9F0A;
    box-shadow: 0 10px 24px rgba(255, 159, 10, 0.24);
}

body.theme-dark .brand-badge {
    background: rgba(10, 132, 255, 0.16);
    color: #0A84FF;
}

@media (hover: hover) {
    body.theme-dark .dock-item:hover {
        background: rgba(10, 132, 255, 0.32);
        box-shadow: 0 18px 40px rgba(10, 132, 255, 0.36);
    }

    body.theme-dark .utility-button:hover {
        box-shadow: 0 18px 40px rgba(10, 132, 255, 0.32);
    }

    body.theme-dark .utility-button.feedback:hover {
        box-shadow: 0 18px 40px rgba(255, 159, 10, 0.34);
    }
}

@media (max-width: 1200px) {
    .dock {
        top: 20px;
        bottom: 20px;
        left: 20px;
        gap: 10px;
        padding: 12px 6px;
    }

    .dock-item {
        width: 40px;
        height: 40px;
        border-radius: 14px;
    }

    .dock-icon svg,
    .dock-icon img {
        width: 18px;
        height: 18px;
    }

    .dock-item::after {
        left: 52px;
        font-size: 0.7rem;
        padding: 3px 6px;
    }
}

@media (max-width: 1024px) {
    .dock {
        top: 16px;
        bottom: 16px;
        left: 16px;
        gap: 8px;
        padding: 10px 4px;
    }

    .dock-item {
        width: 36px;
        height: 36px;
        border-radius: 12px;
    }

    .dock-icon svg,
    .dock-icon img {
        width: 16px;
        height: 16px;
    }

    .dock-item::after {
        font-size: 0.65rem;
        padding: 2px 5px;
        left: 48px;
    }
}

@media (max-width: 768px) {
    .dock {
        display: none;
    }

    .user-panel {
        right: 20px;
        bottom: 20px;
        gap: 10px;
    }

    .utility-button {
        width: 44px;
        height: 44px;
        border-radius: 14px;
    }

    .utility-button .utility-icon {
        width: 20px;
        height: 20px;
    }

    .avatar-button {
        width: 44px !important;
        height: 44px !important;
        border-radius: 14px !important;
        padding: 0 !important;
        box-shadow: 0 6px 16px rgba(0, 122, 255, 0.18) !important;
        background: rgba(0, 122, 255, 0.1) !important;
        transform: none !important;
    }

    .avatar-button:hover,
    .avatar-button:focus {
        transform: none !important;
        box-shadow: 0 6px 16px rgba(0, 122, 255, 0.18) !important;
    }

    .avatar-button svg {
        width: 20px !important;
        height: 20px !important;
    }

    /* 深色模式下的样式统一 */
    body.theme-dark .avatar-button {
        box-shadow: 0 10px 24px rgba(10, 132, 255, 0.24) !important;
        background: rgba(10, 132, 255, 0.15) !important;
    }

    .avatar-button:hover,
    .avatar-button:focus {
        transform: none !important;
        box-shadow: 0 6px 16px rgba(0, 122, 255, 0.18) !important;
    }

    body.theme-dark .avatar-button:hover,
    body.theme-dark .avatar-button:focus {
        box-shadow: 0 10px 24px rgba(10, 132, 255, 0.24) !important;
    }
}

/* 专门为触摸设备禁用悬停效果 */
@media (hover: none) and (pointer: coarse) {
    .avatar-button:hover,
    .avatar-button:focus {
        transform: none !important;
        box-shadow: 0 6px 16px rgba(0, 122, 255, 0.18) !important;
    }

    body.theme-dark .avatar-button:hover,
    body.theme-dark .avatar-button:focus {
        box-shadow: 0 10px 24px rgba(10, 132, 255, 0.24) !important;
    }
}

@media (min-width: 1025px) {
    .container {
        padding-left: calc(var(--spacing-sm) + 80px);
        padding-right: calc(var(--spacing-sm) + 160px);
    }
}

@media (prefers-reduced-motion: reduce) {
    .dock-item,
    .dock-item::after {
        transition: none;
    }

    .dock-item {
        transform: none;
    }
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-sm);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: calc(var(--spacing-xl) + var(--spacing-sm));
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.header,
.main {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
}

.brand-area {
    display: flex;
    align-items: center;
}

.brand-logo {
    width: 120px;
    height: auto;
    display: block;
    object-fit: contain;
    flex-shrink: 0;
}

.brand-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.brand-name-english {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 2.2rem;
    font-weight: 700;
    font-style: italic;
    color: var(--primary-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.5px;
    line-height: 1;
}

.brand-name-chinese {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1;
}

.user-area {
    position: relative;
    display: flex;
    align-items: center;
}

.avatar-button {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    border: none;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 122, 255, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.avatar-button:hover,
.avatar-button:focus {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0, 122, 255, 0.25);
}

.avatar-button:focus {
    outline: 2px solid rgba(0, 122, 255, 0.4);
    outline-offset: 2px;
}

.avatar-button svg {
    width: 24px;
    height: 24px;
}

.avatar-initial {
    display: none;
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.02em;
}

.avatar-button.has-initial .avatar-icon {
    display: none;
}

.avatar-button.has-initial .avatar-initial {
    display: inline;
}

.user-menu {
    position: absolute;
    bottom: calc(100% + 16px);
    right: 0;
    width: 240px;
    background: var(--surface-color);
    border-radius: 16px;
    box-shadow: var(--shadow-medium);
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    z-index: 20;
}

.user-menu::before {
    content: '';
    position: absolute;
    bottom: -8px;
    right: 18px;
    width: 16px;
    height: 16px;
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transform: rotate(45deg);
}

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

.user-menu-header {
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-sm);
}

.user-greeting {
    font-weight: 600;
    color: var(--text-primary);
}

.user-tip {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.user-menu-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.menu-button {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid transparent;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.menu-button.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    box-shadow: 0 8px 16px rgba(0, 122, 255, 0.25);
}

.menu-button.primary:hover {
    box-shadow: 0 10px 20px rgba(0, 122, 255, 0.35);
}

.menu-button.secondary {
    background: rgba(0, 122, 255, 0.08);
    color: var(--primary-color);
}

.menu-button.secondary:hover {
    background: rgba(0, 122, 255, 0.12);
}

.menu-button.ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.menu-button.ghost:hover {
    color: var(--error-color);
    border-color: rgba(255, 59, 48, 0.2);
}

.menu-button[data-action="logout"] {
    display: none;
}

/* 搜索区域平滑固定样式优化 */

/* 基础搜索区域样式 */
.search-area {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    position: sticky;
    top: var(--search-sticky-offset);
    top: calc(var(--search-sticky-offset) + env(safe-area-inset-top));
    z-index: 30;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.search-area::before {
    display: none !important;
}

/* 确保工具网格在搜索框下方正常滚动 */
.tools-grid {
    position: relative;
    z-index: 1;
}

@media (max-width: 600px) {
    .search-area::before {
        inset: -12px -12px;
        border-radius: 24px;
    }
}

.search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--surface-color);
    border-radius: 999px;
    padding: 12px 18px;
    box-shadow: var(--shadow-light);
    border: 1px solid transparent;
    transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.search-box:focus-within {
    border-color: rgba(0, 122, 255, 0.3);
    box-shadow: 0 12px 30px rgba(0, 122, 255, 0.15);
    transform: translateY(-2px);
}

.search-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.search-icon svg {
    width: 24px;
    height: 24px;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1.1rem;
    color: var(--text-primary);
    outline: none;
    min-width: 0;
}

.search-input::-webkit-search-cancel-button,
.search-input::-webkit-search-decoration,
.search-input::-webkit-search-results-button,
.search-input::-webkit-search-results-decoration {
    display: none;
}

.search-input::-ms-clear,
.search-input::-ms-reveal {
    display: none;
    width: 0;
    height: 0;
}

.search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.8;
}

.search-clear {
    border: none;
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
    border-radius: 999px;
    padding: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.search-clear:hover {
    background: rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
}

.search-clear svg {
    width: 18px;
    height: 18px;
}

.search-empty-state {
    color: var(--text-secondary);
    font-size: 1rem;
    text-align: center;
    margin-top: calc(-1 * var(--spacing-md));
}

/* 主内容区域 */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 工具网格布局 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    width: 100%;
    max-width: 900px;
    margin-bottom: var(--spacing-xl);
}

/* 工具卡片样式 */
.tool-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    padding-bottom: 50px; /* 为底部图标留出空间 */
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
}

.tool-card:hover::before {
    opacity: 0.05;
}

.tool-card:active {
    transform: translateY(-4px);
}

.tool-card > * {
    position: relative;
    z-index: 1;
}

.tool-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: transform 0.3s ease;
}

.tool-card:hover .tool-icon {
    transform: scale(1.1);
}

.tool-icon svg {
    width: 40px;
    height: 40px;
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.tool-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-xs);
}

/* 工具卡片底部 */
.tool-footer {
    position: absolute;
    bottom: 12px;
    left: 12px;
    right: 12px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    font-size: 0.85rem;
    color: #666;
}

/* 工具访问次数 */
.tool-visit-count {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 14px;
    background: rgba(var(--primary-rgb, 0, 122, 255), 0.08);
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.tool-visit-count:hover {
    background: rgba(var(--primary-rgb, 0, 122, 255), 0.12);
}

.tool-visit-count .visit-icon {
    width: 14px;
    height: 14px;
    color: var(--primary-color);
    opacity: 0.7;
}

.tool-visit-count .visit-number {
    font-weight: 500;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

/* 访问次数和点赞统计样式 */
.tool-stats {
    position: absolute;
    bottom: 12px;
    left: 12px;
    right: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: #666;
}

.visit-count,
.like-count {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255, 255, 255, 0.9);
    padding: 4px 8px;
    border-radius: 12px;
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.visit-count {
    position: absolute;
    bottom: 0;
    left: 0;
}

.like-count {
    position: absolute;
    bottom: 0;
    right: 0;
}

.visit-count .count,
.like-count .count {
    font-weight: 500;
    color: #333;
}

/* 图标样式 */
.visit-icon, .like-icon-small {
    width: 14px;
    height: 14px;
    color: #666;
}

.like-icon-small {
    color: #e74c3c;
}

/* 工具页面头部样式已移除，使用默认居中样式 */

/* 点赞和收藏按钮样式已移除 */

/* 按钮动画和图标样式已移除 */

/* 占位卡片样式 */
.tool-card.placeholder {
    opacity: 0.6;
    cursor: default;
}

.tool-card.placeholder:hover {
    transform: none;
    box-shadow: var(--shadow-light);
}

.tool-card.placeholder::before {
    display: none;
}

.tool-card.placeholder .tool-icon {
    background: var(--text-secondary);
}

.tool-card.placeholder:hover .tool-icon {
    transform: none;
}

/* 页脚样式 */
.footer {
    text-align: center;
    padding: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

/* 模态框与表单样式 */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.modal-dialog {
    background: var(--surface-color);
    border-radius: 20px;
    padding: var(--spacing-lg);
    width: min(90vw, 400px);
    box-shadow: var(--shadow-medium);
    position: relative;
    transform: translateY(24px);
    transition: transform 0.3s ease;
}

.modal.is-visible .modal-dialog {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 18px;
    right: 18px;
    border: none;
    background: transparent;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.modal-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.auth-form input {
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 12px 14px;
    background: rgba(142, 142, 147, 0.05);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.auth-form input:focus {
    outline: none;
    border-color: rgba(0, 122, 255, 0.6);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.captcha-group .captcha-wrapper {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
    align-items: center;
}

.captcha-wrapper canvas {
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: rgba(142, 142, 147, 0.08);
}

.link-button {
    border: none;
    background: transparent;
    color: var(--primary-color);
    cursor: pointer;
    font-weight: 500;
    padding: 0;
}

.link-button:hover {
    text-decoration: underline;
}

.form-message {
    min-height: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-message.error {
    color: var(--error-color);
}

.form-message.success {
    color: var(--success-color);
}

.primary-action {
    border: none;
    border-radius: 14px;
    padding: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 12px 24px rgba(0, 122, 255, 0.3);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-action:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(0, 122, 255, 0.35);
}

.form-switch {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .brand-badge {
        font-size: 0.85rem;
    }

    .user-menu {
        right: -12px;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }

    .search-box {
        border-radius: var(--border-radius);
        padding: 12px 16px;
    }

    .search-input {
        font-size: 1rem;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .search-box {
        padding: 10px 14px;
    }

    .search-icon svg {
        width: 20px;
        height: 20px;
    }

    .search-input {
        font-size: 0.95rem;
    }

    .tool-icon {
        width: 56px;
        height: 56px;
    }
    
    .tool-icon svg {
        width: 28px;
        height: 28px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card {
    animation: fadeInUp 0.6s ease forwards;
}

.tool-card:nth-child(1) { animation-delay: 0.1s; }
.tool-card:nth-child(2) { animation-delay: 0.2s; }
.tool-card:nth-child(3) { animation-delay: 0.3s; }
.tool-card:nth-child(4) { animation-delay: 0.4s; }
.tool-card:nth-child(5) { animation-delay: 0.5s; }
.tool-card:nth-child(6) { animation-delay: 0.6s; }

/* 焦点样式 */
.tool-card:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}