:root {
    --md-sys-color-primary: #006495;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #cbe6ff;
    --md-sys-color-on-primary-container: #001e31;
    --md-sys-color-surface: #fafcff;
    --md-sys-color-surface-container: #edf0f3;
    --md-sys-color-surface-container-low: #f3f6f9;
    --md-sys-color-surface-container-high: #e9ecef;
    --md-sys-color-outline: #72787e;
    --md-sys-color-outline-variant: #c2c7cc;
    --md-sys-color-error: #ba1a1a;
    --md-sys-color-error-container: #ffdad6;
    
    --md-elevation-level-1: 0px 1px 2px 0px rgba(0, 0, 0, 0.3),
                           0px 1px 3px 1px rgba(0, 0, 0, 0.15);
    --md-elevation-level-2: 0px 2px 6px 2px rgba(0, 0, 0, 0.15),
                           0px 1px 2px 0px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Roboto', 'Microsoft YaHei', sans-serif;
    margin: 0;
    padding: 24px;
    background-color: var(--md-sys-color-surface);
    color: #292B2D;
}

.container {
    max-width: 1200px;
    margin: 24px auto;
    padding: 24px;
    background-color: var(--md-sys-color-surface);
    border-radius: 28px;
    box-shadow: var(--md-elevation-level-1);
}

/* Header Styles */
.app-header {
    display: flex;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--md-sys-color-outline);
}

.app-header h1 {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: 0;
    line-height: 32px;
    color: var(--md-sys-color-primary);
    margin: 0;
}

.app-header h1 strong {
    font-weight: 600;
}

/* Navigation Tags */
.format-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.tag {
    height: 32px;
    padding: 0 16px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    background-color: var(--md-sys-color-surface-container-low);
    color: var(--md-sys-color-primary);
    transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    user-select: none;
}

.tag:hover {
    background-color: var(--md-sys-color-secondary-container);
}

.tag.active {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border: none;
}

.tag:active {
    transform: scale(0.98);
    background-image: linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.1));
}

/* Editor Container */
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.editor-box {
    background-color: var(--md-sys-color-surface-container);
    border-radius: 16px;
    padding: 16px;
    border: 1px solid var(--md-sys-color-outline-variant);
    overflow: hidden;
}

/* ... 其他共享样式 ... */