/* CSS变量定义 - 统一色调 */
:root {
    /* 主色调 - 罗马红系 */
    --primary-color: #dc2626;      /* 主红色 */
    --primary-dark: #b91c1c;      /* 深红色 */
    --primary-light: #ef4444;     /* 浅红色 */
    --primary-lighter: #fca5a5;   /* 更浅红色 */
    
    /* 辅助色 - 红色系渐变 */
    --secondary-color: #991b1b;   /* 辅助红色 */
    --accent-color: #7f1d1d;      /* 强调红色 */
    
    /* 中性色 - 围绕罗马红的暖色调 */
    --text-primary: #7f1d1d;      /* 主文本色 - 深罗马红 */
    --text-secondary: #991b1b;    /* 次要文本色 - 中罗马红 */
    --text-muted: #b91c1c;        /* 静音文本色 - 浅罗马红 */
    
    /* 背景色 - 围绕罗马红的暖色调 */
    --bg-primary: #fef7f7;        /* 主背景色 - 极浅罗马红 */
    --bg-secondary: #fef2f2;      /* 次背景色 - 浅罗马红 */
    --bg-card: #ffffff;           /* 卡片背景色 - 纯白 */
    
    /* 边框色 - 围绕罗马红的暖色调 */
    --border-color: #fecaca;      /* 边框色 - 浅罗马红 */
    --border-hover: #fca5a5;      /* 悬停边框色 - 更浅罗马红 */
    
    /* 状态色 - 罗马红系 */
    --success-color: #dc2626;     /* 成功色（罗马红） */
    --success-bg: #fef2f2;        /* 成功背景色 */
    --error-color: #991b1b;       /* 错误色（深罗马红） */
    --error-bg: #fef2f2;          /* 错误背景色 */
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

/* 强制重置所有输入框的默认焦点样式 */
input, textarea, select {
    outline: none !important;
}

input:focus, input:focus-visible, input:focus-within,
textarea:focus, textarea:focus-visible, textarea:focus-within,
select:focus, select:focus-visible, select:focus-within {
    outline: none !important;
}

body {
    font-family: 'Segoe UI', 'Segoe UI Symbol', 'Cambria', 'Times New Roman', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1;
}

/* 主容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    animation: fadeIn 0.8s ease-out;
}

/* 页面加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 页面头部 */
.page-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    animation: slideInDown 1s ease-out;
}

/* 头部装饰元素 */
.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.main-title {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1;
    animation: titleGlow 2s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    from {
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }
    to {
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2), 0 0 20px rgba(255, 255, 255, 0.3);
    }
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.subtitle-hint {
    font-size: 0.95rem;
    opacity: 0.9;
    font-style: italic;
    margin-top: 8px;
    color: white;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 18px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    display: inline-block;
    max-width: 600px;
    text-align: center;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* 转换器区域 */
.converter-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
    animation: slideInUp 1.2s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.converter-box {
    background: var(--bg-card);
    padding: 35px;
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.converter-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--primary-color));
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.converter-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(220, 38, 38, 0.1), 0 10px 10px -5px rgba(220, 38, 38, 0.04);
    border-color: var(--primary-light);
}

.converter-box:hover::before {
    transform: translateX(0);
}

.converter-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

/* 输入输出组 */
.input-group, .output-group {
    margin-bottom: 20px;
}

.output-container {
    display: flex;
    gap: 10px;
    align-items: center;
}

.output-container .result-input {
    flex: 1;
}

/* 罗马数字显示优化 */
.roman-numeral {
    font-family: 'Segoe UI', 'Segoe UI Symbol', 'Cambria', 'Times New Roman', monospace;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1;
    font-variant-ligatures: common-ligatures;
    -webkit-font-feature-settings: 'liga' 1;
    -moz-font-feature-settings: 'liga' 1;
    -ms-font-feature-settings: 'liga' 1;
}

/* 输入提示 */
.input-tip {
    margin-top: 8px;
    padding: 10px 14px;
    background-color: var(--primary-lighter);
    border: 1px solid var(--primary-light);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    box-shadow: 0 1px 3px rgba(220, 38, 38, 0.1);
}

.empty-tip {
    margin-top: 8px;
    padding: 8px 12px;
    height: 36px; /* 与 input-tip 保持一致的高度 */
    box-sizing: border-box;
}

.tip-icon {
    font-size: 1rem;
}

.tip-text code {
    background-color: var(--bg-primary);
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
    font-weight: 600;
}

.input-label, .output-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.number-input, .text-input, .result-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    font-family: 'Segoe UI', 'Segoe UI Symbol', 'Cambria', 'Times New Roman', monospace;
    transition: all 0.3s ease;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1;
    background: var(--bg-card);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.number-input:focus, .text-input:focus {
    outline: none !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1), inset 0 1px 3px rgba(0, 0, 0, 0.05) !important;
    transform: translateY(-1px);
}

/* 强制覆盖所有可能的焦点样式 */
input:focus, input:focus-visible, input:focus-within {
    outline: none !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1) !important;
}

.result-input {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

/* 按钮样式 */
.convert-button, .copy-button {
    padding: 14px 24px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 10px;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.convert-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    width: 100%;
    box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
}

.convert-button::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 0.5s;
}

.convert-button:hover::before {
    left: 100%;
}

.convert-button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.4);
}

.convert-button:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
}

.copy-button {
    background: var(--success-color);
    color: white;
    margin-left: 10px;
    padding: 10px 18px;
    font-size: 0.9rem;
    box-shadow: 0 3px 10px rgba(220, 38, 38, 0.25);
}

.copy-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 38, 38, 0.35);
}

.copy-button:active {
    transform: translateY(0);
    box-shadow: 0 3px 10px rgba(220, 38, 38, 0.25);
}

/* 符号参考表 */
.symbol-reference {
    background: var(--bg-card);
    padding: 35px;
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
    animation: slideInUp 1.4s ease-out;
    position: relative;
    overflow: hidden;
}

.symbol-reference::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--primary-color));
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 25px;
    color: var(--text-primary);
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

.symbol-tables {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.symbol-table {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.table-title {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    text-align: center;
}

.symbol-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
}

.symbol-item {
    background: var(--bg-card);
    padding: 12px 16px;
    border-radius: 10px;
    text-align: center;
    font-family: 'Segoe UI', 'Segoe UI Symbol', 'Cambria', 'Times New Roman', monospace;
    font-weight: 600;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.symbol-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.15);
    background: linear-gradient(135deg, var(--bg-card), rgba(252, 165, 165, 0.1));
}

/* 示例区域 */
.examples-section {
    background: var(--bg-card);
    padding: 35px;
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
    animation: slideInUp 1.6s ease-out;
    position: relative;
    overflow: hidden;
}

.examples-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--primary-color));
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
}

.example-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.example-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.1);
    border-left-width: 6px;
}

.example-title {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    text-align: center;
}

.example-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.example-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: white;
    padding: 10px 15px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.arabic-example, .roman-example {
    font-family: 'Segoe UI', 'Segoe UI Symbol', 'Cambria', 'Times New Roman', monospace;
    font-weight: 600;
    color: var(--text-primary);
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1;
}

.arrow {
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.1rem;
}

/* 消息提示 */
.error-message, .success-message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 18px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    z-index: 1000;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    animation: slideInFromRight 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

.error-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 动画 */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .converter-section {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .converter-box {
        padding: 20px;
    }
    
    .symbol-tables {
        grid-template-columns: 1fr;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .error-message, .success-message {
        position: relative;
        top: auto;
        right: auto;
        margin: 10px 0;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .converter-title, .section-title {
        font-size: 1.4rem;
    }
    
    .symbol-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* 额外的微动画和交互效果 */
.symbol-item, .example-item {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.symbol-item:active, .example-item:active {
    transform: scale(0.98);
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* 选择文本样式 */
::selection {
    background: var(--primary-lighter);
    color: var(--primary-dark);
}

::-moz-selection {
    background: var(--primary-lighter);
    color: var(--primary-dark);
}

/* 焦点可见性增强 */
.convert-button:focus, .copy-button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #dc2626;
        --primary-dark: #b91c1c;
        --border-color: #dc2626;
        --text-primary: #000000;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}