* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 浅色主题（默认跟随系统） */
:root {
    --bg-page: #f5f7fa;
    --bg-header: #ffffff;
    --border-light: #e2e8f0;
    --text-primary: #1e2a3a;
    --text-secondary: #4a5b6e;
    --card-bg: #ffffff;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.05);
    --select-border: #cbd5e1;
    --accent: #2c5f8a;
    --accent-hover: #1f4a6e;
    --code-bg: #f1f5f9;
}

/* 深色主题（跟随系统） */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-page: #0f1217;
        --bg-header: #1a1e26;
        --border-light: #2a2f3a;
        --text-primary: #eef2f8;
        --text-secondary: #9aa9bb;
        --card-bg: #1a1e26;
        --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
        --select-border: #374151;
        --accent: #6da5d0;
        --accent-hover: #8bb9dd;
        --code-bg: #222631;
    }
}

/* 手动选择浅色主题 */
body.light {
    --bg-page: #f5f7fa;
    --bg-header: #ffffff;
    --border-light: #e2e8f0;
    --text-primary: #1e2a3a;
    --text-secondary: #4a5b6e;
    --card-bg: #ffffff;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.05);
    --select-border: #cbd5e1;
    --accent: #2c5f8a;
    --accent-hover: #1f4a6e;
    --code-bg: #f1f5f9;
}

/* 手动选择深色主题 */
body.dark {
    --bg-page: #0f1217;
    --bg-header: #1a1e26;
    --border-light: #2a2f3a;
    --text-primary: #eef2f8;
    --text-secondary: #9aa9bb;
    --card-bg: #1a1e26;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
    --select-border: #374151;
    --accent: #6da5d0;
    --accent-hover: #8bb9dd;
    --code-bg: #222631;
}

body {
    background-color: var(--bg-page);
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    color: var(--text-primary);
    transition: background 0.2s, color 0.2s;
    line-height: 1.5;
}

.top-bar {
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 10;
    width: 100%;
}

.top-bar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 20px;
    row-gap: 12px;
}

/* PC端布局 */
.controls-toggle, .mobile-controls, .mobile-only {
    display: none !important;
}

.desktop-only {
    display: flex !important;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

select {
    background: var(--card-bg);
    border: 1px solid var(--select-border);
    border-radius: 4px;
    padding: 8px 28px 8px 12px;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 400;
    cursor: pointer;
    outline: none;
    transition: 0.2s;
    min-width: 130px;
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
}

select:hover {
    border-color: var(--accent);
}

.right-controls {
    margin-left: auto;
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.theme-switch {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.theme-btn {
    background: transparent;
    border: 1px solid var(--select-border);
    border-radius: 4px;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-secondary);
    transition: 0.2s;
    line-height: normal;
}

.theme-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.home-btn {
    background: transparent;
    border: 1px solid var(--select-border);
    border-radius: 4px;
    padding: 8px 14px;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: 0.2s;
    text-decoration: none;
    line-height: normal;
    display: flex;
    align-items: center;
    justify-content: center;
}

.home-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.main-content {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    margin: 32px 0;
}

.report-header {
    padding: 20px 28px;
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-header);
}

.report-title {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.report-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.report-body {
    padding: 28px 32px;
    line-height: 1.65;
    font-size: 1rem;
    color: var(--text-primary);
}

.report-body h2 {
    font-size: 1.5rem;
    margin: 2em 0 0.8em;
    font-weight: 600;
    border-left: 4px solid var(--accent);
    padding-left: 16px;
    color: var(--text-primary);
}

.report-body h3 {
    font-size: 1.25rem;
    margin: 1.6em 0 0.5em;
    font-weight: 500;
    color: var(--text-primary);
}

.report-body h4 {
    font-size: 1.1rem;
    margin: 1.4em 0 0.4em;
    font-weight: 500;
    color: var(--text-primary);
}

.report-body p {
    margin-bottom: 1rem;
    text-align: left;
}

.report-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.2rem 0;
    font-size: 0.9rem;
}

.report-body th, .report-body td {
    border: 1px solid var(--border-light);
    padding: 8px 12px;
    text-align: left;
}

.report-body th {
    background: var(--code-bg);
    font-weight: 600;
}

.report-body ul, .report-body ol {
    margin: 0.5rem 0 1rem 1.5rem;
}

.placeholder {
    padding: 48px 20px;
    text-align: center;
    color: var(--text-secondary);
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 48px;
}

.loading span {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    display: inline-block;
    animation: pulse 1.2s infinite;
}

.loading .loading-text {
    width: auto;
    height: auto;
    background: none;
    border-radius: 0;
    font-size: 1rem;
    color: var(--text-secondary);
    animation: none;
    white-space: nowrap;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(0.8);}
    50% { opacity: 1; transform: scale(1.2);}
}

footer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding: 24px 0 40px;
    border-top: 1px solid var(--border-light);
    margin-top: 16px;
}

@media (max-width: 700px) {
    .app { padding: 0 16px; }
    
    /* 移动端：隐藏PC端的选择器 */
    .desktop-only {
        display: none !important;
    }
    
    /* 移动端：显示移动端特有的元素 */
    .mobile-only,
    .controls-toggle {
        display: flex !important;
    }
    
    .top-bar-inner { 
        flex-direction: row; 
        align-items: center; 
        justify-content: space-between;
        padding: 10px 16px; 
        gap: 12px;
    }
    .controls-toggle {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 8px 12px;
        background: var(--card-bg);
        border: 1px solid var(--select-border);
        border-radius: 4px;
        cursor: pointer;
        font-size: 0.9rem;
        color: var(--text-primary);
        transition: 0.2s;
    }
    .controls-toggle:hover {
        border-color: var(--accent);
    }
    .controls-toggle-icon {
        font-size: 0.9rem;
        transition: transform 0.2s;
        color: var(--text-secondary);
    }
    .controls-toggle.active .controls-toggle-icon {
        transform: rotate(180deg);
    }
    .mobile-controls {
        display: none !important;
        width: 100%;
        padding: 10px 16px 16px;
        border-top: 1px solid var(--border-light);
        margin-top: 10px;
        box-sizing: border-box;
    }
    .mobile-controls.active {
        display: flex !important;
        flex-direction: column;
        gap: 12px;
    }
    .mobile-controls .control-group {
        display: flex !important;
        width: 100%;
    }
    .mobile-controls .control-group label {
        font-size: 0.7rem;
    }
    .mobile-controls select {
        width: 100%;
        padding: 8px 24px 8px 10px;
        font-size: 0.9rem;
    }
    .right-controls.mobile-only { 
        display: flex !important;
        margin-left: 0;
        justify-content: flex-end;
        gap: 6px;
        align-items: center;
    }
    
    .theme-switch { 
        margin-left: 0;
        gap: 6px;
        align-items: center;
    }
    
    .home-btn {
        font-size: 0.9rem;
        padding: 8px 12px;
    }
    .theme-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    .report-header { padding: 16px 20px; }
    .report-body { padding: 20px; }
    .report-title { font-size: 1.4rem; }
}