:root {
    --primary-color: #4a90e2;
    --primary-dark: #2563a7;
    --secondary-color: #f5f5f5;
    --text-color: #333;
    --border-color: #e0e0e0;
    --hover-color: #e8f0fe;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --background-color: #ffffff;
    --card-background: #ffffff;
}

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

html {
    font-size: 16px;
}

/* 移动端基础字体大小调整 */
@media (max-width: 768px) {
    html {
        font-size: 15px;  /* 稍微调大一点移动端的基础字体大小 */
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
    overflow-x: hidden;
}

header {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, #6e8efb, #4a90e2);
    color: white;
    box-shadow: 0 2px 4px var(--shadow-color);
    grid-row: 1;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 移动端头部适配 */
@media (max-width: 768px) {
    header {
        padding: 1rem 0.5rem;
    }

    header h1 {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }

    header p {
        font-size: 0.9rem;
    }
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: calc(100vh - 200px);
    grid-row: 2;
    width: 100%;
}

/* 移动端主内容区域适配 */
@media (max-width: 768px) {
    main {
        padding: 1rem 0.5rem;
    }
}

.search-container {
    margin-bottom: 2rem;
    position: relative;
    padding: 0 1rem;
}

#searchEmoji {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
    background-color: var(--card-background);
    color: var(--text-color);
}

/* 移动端搜索框适配 */
@media (max-width: 768px) {
    .search-container {
        padding: 0.5rem;
    }

    .search-container input {
        font-size: 1rem;
        padding: 0.5rem 1rem;
    }
}

#searchEmoji:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.categories {
    display: flex;
    gap: 0.5rem;
    padding: 1rem;
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

/* 移动端分类按钮适配 */
@media (max-width: 768px) {
    .categories {
        padding: 0.5rem;
        gap: 0.5rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
        flex-wrap: nowrap;
        justify-content: flex-start;
        width: 100%;
        max-width: 100vw;
        margin: 0;
        white-space: nowrap;
    }

    .categories::-webkit-scrollbar {
        display: none;
    }

    .category-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
        white-space: nowrap;
        flex: 0 0 auto;
        min-width: max-content;
    }
}

.category-btn {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    flex: 0 0 auto;
}

.category-btn:hover {
    background-color: var(--hover-color);
}

.category-btn.active {
    background-color: var(--primary-dark);
    color: white;
    border-color: var(--primary-dark);
    font-weight: 500;
}

/* 小屏幕手机适配 */
@media (max-width: 320px) {
    .categories {
        padding: 0.4rem;
        gap: 0.4rem;
    }

    .category-btn {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
}

/* Emoji网格布局 */
#emoji-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 12px;
    padding: 1rem;
}

/* 移动端布局优化 */
@media (max-width: 768px) {
    #emoji-container {
        grid-template-columns: repeat(4, 1fr);  /* 固定4列布局 */
        gap: 10px;
        padding: 0.8rem;
    }
}

/* 小屏幕手机适配 */
@media (max-width: 320px) {
    #emoji-container {
        grid-template-columns: repeat(3, 1fr);  /* 更小屏幕使用3列 */
        gap: 8px;
        padding: 0.6rem;
    }
}

.emoji-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    text-align: center;
    animation: fadeIn 0.3s ease forwards;
}

.emoji-char {
    font-size: 2rem;
    margin-bottom: 5px;
}

.emoji-keyword {
    font-size: 0.9rem;  /* 增加到 0.9rem */
    color: var(--text-color);
    opacity: 0.9;  /* 增加不透明度以提高可读性 */
    word-break: break-word;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
}

.emoji-item:hover {
    transform: scale(1.05);
    background-color: var(--hover-color);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.emoji-item:active {
    transform: scale(0.95);
}

/* 触摸设备优化 */
@media (hover: none) {
    .emoji-item {
        -webkit-tap-highlight-color: transparent;
    }

    .emoji-item:active {
        transform: scale(0.95);
        background-color: var(--hover-color);
    }

    .category-btn:active {
        background-color: var(--primary-color);
        color: white;
    }
}

/* 移动端表情符号样式调整 */
@media (max-width: 768px) {
    .emoji-item {
        padding: 8px;
    }

    .emoji-char {
        font-size: 1.8rem;
        margin-bottom: 4px;
    }

    .emoji-keyword {
        font-size: 0.95rem;
        -webkit-line-clamp: 1;
    }
}

/* 小屏幕手机适配 */
@media (max-width: 320px) {
    .emoji-item {
        padding: 6px;
    }

    .emoji-char {
        font-size: 1.6rem;
        margin-bottom: 3px;
    }

    .emoji-keyword {
        font-size: 0.9rem;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #5c9ce6;
        --primary-dark: #2563a7;
        --secondary-color: #2a2a2a;
        --text-color: #e0e0e0;
        --border-color: #404040;
        --hover-color: #3a3a3a;
        --shadow-color: rgba(0, 0, 0, 0.2);
        --background-color: #1a1a1a;
        --card-background: #2d2d2d;
    }

    .search-container input {
        background-color: var(--card-background);
        color: var(--text-color);
    }

    .category-btn {
        background-color: var(--card-background);
        color: var(--text-color);
    }

    .category-btn.active {
        background-color: var(--primary-dark);
        color: white;
    }

    #copy-notification {
        background-color: var(--card-background);
        color: var(--text-color);
    }
}

/* 加载提示样式 */
#loading-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    color: var(--text-color);
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

#loading-indicator.hidden {
    display: none;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    border: 2px solid var(--primary-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 移动端加载提示适配 */
@media (max-width: 768px) {
    #loading-indicator {
        padding: 0.8rem;
        font-size: 0.9rem;
    }

    .loading-spinner {
        width: 16px;
        height: 16px;
        margin-right: 6px;
        border-width: 1.5px;
    }
}

/* 安全区域适配 */
@supports (padding: env(safe-area-inset-bottom)) {
    body {
        padding-bottom: env(safe-area-inset-bottom);
    }

    #copy-notification {
        bottom: calc(1rem + env(safe-area-inset-bottom));
    }
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #357abd;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: #f8fafc;
    border-top: 1px solid #e2e8f0;
    color: #1e293b;
}

footer a {
    color: #2563eb;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
    color: #1e40af;
}

#copy-notification {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 20px;
    z-index: 1000;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

#copy-notification.hidden {
    opacity: 0;
    visibility: hidden;
}

#copy-notification.show {
    opacity: 1;
    visibility: visible;
}

.result-count {
    position: absolute;
    right: 0;
    top: -1.5rem;
    font-size: 0.9rem;
    color: #666;
}