/* 基础样式 */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --border-color: #e2e8f0;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}



/* 图标样式 */
.bi {
    display: inline-block;
    vertical-align: -0.125em;
    margin-right: 0.25rem;
}

/* 区块标题 */
.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.section-title > :first-child {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.section-title .bi {
    color: var(--primary-color);
    font-size: 1rem;
}

/* 容器布局 */
.app-container {
    min-height: 100vh;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.converter-wrapper {
    width: 100%;
    max-width: 600px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* 头部样式 */
.app-header {
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    text-align: center;
border-top-left-radius: 10px; /* 设置左上角的圆角 */
  border-top-right-radius: 10px; /* 设置右上角的圆角 */
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-header p {
    margin-bottom: 0rem;
}

.app-header .bi {
    font-size: 1.25rem;
}

.header-desc {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    opacity: 0.9;
}

/* 主体内容 */
.main-content {
    padding: 1.25rem;
}

/* 输入区域 */
.input-section {
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin-bottom: 1rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: nowrap;
}

.sign-select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    width: 4rem;
}

.number-input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    width: 100%;
}

.number-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.unit {
    color: var(--text-secondary);
    font-size: 1rem;
    user-select: none;
}

.convert-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: var(--radius-md);
    background: var(--primary-color);
    color: white;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.convert-btn:hover {
    background: var(--primary-hover);
}

.convert-btn .bi {
    font-size: 1rem;
}

/* 说明区域 */
.info-section {
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 1rem;
}

.info-content {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.info-content ul {
    list-style-position: inside;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.info-content li {
    margin-bottom: 0.5rem;
}

.info-content li:last-child {
    margin-bottom: 0;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .app-container {
        padding: 0;
    }

    .converter-wrapper {
        border-radius: 0;
        border: none;
    }

    .input-group {
        flex-wrap: wrap;
    }

    .sign-select {
        width: 100%;
    }
}