/* ========== unit-converter.css ========== */

/* 统一颜色变量 */
:root {
    --primary-color: #4a00e0;
    --secondary-color: #8e2de2;
    --accent-color: #00c6ff;
    --dark-bg: #0a0a0a;
    --darker-bg: #050505;
    --text-light: #ffffff;
    --text-gray: #b0b0b0;
    --text-dim: #808080;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-hover: rgba(255, 255, 255, 0.08);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    --success-color: #00ff88;
    --error-color: #ff4757;
    --warning-color: #ffa502;

    /* 玻璃拟态效果 */
    --glass-bg: rgba(30, 30, 40, 0.6);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* 动画 */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 自定义滚动条样式 - 优化重点 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--darker-bg);
    border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* 历史记录区域滚动条特殊样式 */
.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
}

.history-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-gray);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--dark-bg);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 工具页面样式 */
.tool-section {
    min-height: 100vh;
    padding: 120px 0 80px;
}

.tool-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(12px);
    transition: var(--transition-medium);
}

.tool-container:hover {
    border-color: var(--border-hover);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.tool-container h2 {
    text-align: center;
    margin-bottom: 0.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.2rem;
    font-weight: 700;
}

.tool-subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 15px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--darker-bg);
}

.category-tabs::-webkit-scrollbar {
    height: 6px;
}

.category-tabs::-webkit-scrollbar-track {
    background: var(--darker-bg);
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    background: var(--darker-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-gray);
    transition: var(--transition-medium);
    white-space: nowrap;
    min-width: fit-content;
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.tab-btn:hover::before {
    left: 100%;
}

.tab-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(74, 0, 224, 0.3);
    transform: translateY(-2px);
}

.tab-btn.active:hover {
    box-shadow: 0 8px 20px rgba(74, 0, 224, 0.4);
}

/* 转换器主体 */
.converter-body {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.input-section {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* 加载动画 */
.loading {
    position: relative;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 15px;
    width: 16px;
    height: 16px;
    border: 2px solid var(--text-gray);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    transform: translateY(-50%);
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
    min-width: 250px;
    position: relative;
}

.input-group label {
    color: var(--text-gray);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0 5px;
}

.input-group input,
.input-group select {
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition-medium);
    background: var(--dark-bg);
    color: var(--text-light);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(0, 198, 255, 0.2);
    transform: translateY(-1px);
}

.input-group input[readonly] {
    background: var(--darker-bg);
    cursor: not-allowed;
    color: var(--text-gray);
    user-select: none;
}

/* 错误提示 */
.error-shake {
    animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translateX(-3px); }
    20%, 80% { transform: translateX(3px); }
    30%, 50%, 70% { transform: translateX(-5px); }
    40%, 60% { transform: translateX(5px); }
}

.swap-btn {
    padding: 15px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(74, 0, 224, 0.3);
    position: relative;
    z-index: 1;
}

.swap-btn:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 6px 16px rgba(74, 0, 224, 0.4);
}

.swap-btn:active {
    transform: rotate(180deg) scale(0.95);
}

.swap-icon {
    font-size: 1.5rem;
    font-weight: bold;
}

/* 转换历史 - 优化重点 */
.conversion-history {
    background: var(--darker-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 2rem;
    transition: var(--transition-medium);
}

.conversion-history:hover {
    border-color: var(--border-hover);
}

.conversion-history h3 {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.history-count {
    color: var(--text-dim);
    font-size: 0.9rem;
}

.history-list {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 15px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--darker-bg);
    padding-right: 5px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: var(--dark-bg);
    border-radius: 8px;
    margin-bottom: 8px;
    transition: var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.history-item:hover {
    background: var(--card-hover);
    transform: translateX(5px);
    border-color: var(--primary-color);
}

.history-item.reusing {
    animation: pulse 0.6s ease;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 198, 255, 0.4); }
    70% { box-shadow: 0 0 0 8px rgba(0, 198, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 198, 255, 0); }
}

.history-formula {
    font-weight: 500;
    color: var(--text-light);
    font-size: 0.95rem;
}

.history-time {
    font-size: 0.8rem;
    color: var(--text-dim);
    flex-shrink: 0;
    margin-left: 10px;
}

.empty-history {
    text-align: center;
    color: var(--text-gray);
    padding: 40px 20px;
    font-style: italic;
    opacity: 0.7;
}

.clear-history-btn {
    padding: 8px 16px;
    background: var(--darker-bg);
    color: var(--text-gray);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition-medium);
    font-weight: 500;
}

.clear-history-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    border-color: var(--primary-color);
}

.clear-history-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* 常用转换参考 */
.quick-conversions {
    background: var(--darker-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 2rem;
    transition: var(--transition-medium);
}

.quick-conversions:hover {
    border-color: var(--border-hover);
}

.quick-conversions h3 {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.quick-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: var(--dark-bg);
    border-radius: 12px;
    transition: var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.quick-item:hover {
    background: var(--card-hover);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.quick-label {
    font-weight: 600;
    color: var(--text-light);
}

.quick-value {
    color: var(--text-gray);
    font-size: 0.95rem;
    font-weight: 500;
}

/* 页脚 */
.footer {
    text-align: center;
    margin-top: 40px;
}

.back-link {
    color: var(--text-gray);
    text-decoration: none;
    font-weight: 500;
    padding: 10px 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    transition: var(--transition-medium);
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.back-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

/* 通知提示 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
    transform: translateX(400px);
    transition: var(--transition-medium);
    z-index: 1000;
    max-width: 350px;
}

.notification.show {
    transform: translateX(0);
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.notification-icon {
    font-size: 1.2rem;
}

.notification.success {
    border-color: var(--success-color);
}

.notification.error {
    border-color: var(--error-color);
}

.notification.warning {
    border-color: var(--warning-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .tool-section {
        padding: 100px 0 60px;
    }

    .tool-container {
        padding: 2rem 1.5rem;
    }

    .tool-container h2 {
        font-size: 1.8rem;
    }

    .input-section {
        flex-direction: column;
        align-items: stretch;
    }

    .swap-btn {
        align-self: center;
        order: -1;
        margin-bottom: 15px;
        width: 45px;
        height: 45px;
    }

    .category-tabs {
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        min-width: 80px;
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    .quick-grid {
        grid-template-columns: 1fr;
    }

    .notification {
        left: 20px;
        right: 20px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .tool-container {
        padding: 1.5rem 1rem;
        border-radius: 15px;
    }

    .input-group {
        min-width: 100%;
    }

    .quick-item {
        padding: 12px 15px;
    }
}

/* 加载动画 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* WebKit 内核浏览器 (Chrome, Safari, Edge) */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Firefox */
input[type="number"] {
    -moz-appearance: textfield;
}

/* 可选：确保禁用状态下的样式一致性 */
input[type="number"]:disabled {
    -moz-appearance: textfield;
    -webkit-appearance: none;
}