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

:root {
    /* 苹果风格颜色系统 */
    --apple-blue: #007aff;
    --apple-blue-dark: #0062cc;
    --apple-green: #34c759;
    --apple-red: #ff3b30;
    --apple-orange: #ff9500;
    --apple-yellow: #ffcc00;
    --apple-purple: #af52de;
    --apple-gray: #8e8e93;
    --apple-gray-light: #aeaeb2;
    --apple-gray-lighter: #f2f2f7;
    --apple-white: #ffffff;
    --apple-black: #1d1d1f;
    --apple-text: #1d1d1f;
    --apple-background: #f5f5f7;
    --apple-card-background: #ffffff;
    --apple-card-shadow: rgba(0, 0, 0, 0.08);
    --apple-border: rgba(0, 0, 0, 0.1);
    --apple-gradient-blue: linear-gradient(145deg, #0090ff, #0062cc);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    color: var(--apple-text);
    background-color: var(--apple-background);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: var(--apple-blue);
    transition: color 0.2s ease;
}

a:hover {
    color: var(--apple-blue-dark);
}

ul {
    list-style: none;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--apple-text);
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 1.25rem;
}

h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
    color: #434344;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: -0.01em;
}

.btn i {
    margin-right: 8px;
}

.primary {
    background-color: var(--apple-blue);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.primary:hover {
    background-color: var(--apple-blue-dark);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.4);
}

.secondary {
    background-color: var(--apple-white);
    color: var(--apple-text);
    border: 1px solid var(--apple-border);
}

.secondary:hover {
    background-color: var(--apple-gray-lighter);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 顶部导航栏 */
header {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    box-shadow: 0 1px 0 var(--apple-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 24px;
}

.logo h1 {
    color: var(--apple-text);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    font-weight: 600;
}

.logo h1 i {
    margin-right: 10px;
    color: var(--apple-blue);
}

nav ul {
    display: flex;
    align-items: center;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: #555;
    font-weight: 500;
    padding: 5px 0;
    position: relative;
    font-size: 0.95rem;
}

nav ul li a:hover {
    color: var(--apple-blue);
}

nav ul li a.active {
    color: var(--apple-blue);
    font-weight: 600;
}

nav ul li a.active:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--apple-blue);
}

.language-switch a {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    background-color: var(--apple-gray-lighter);
    border-radius: 15px;
    font-size: 0.85rem;
}

.language-switch a i {
    margin-right: 5px;
    font-size: 0.8rem;
}

/* 英雄区域 */
.hero {
    padding: 70px 0;
    background-color: var(--apple-white);
    text-align: center;
    margin-bottom: 2rem;
}

.hero h2 {
    font-size: 2.5rem;
    color: var(--apple-text);
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.25rem;
    color: #5f5f61;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.test-action {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* 测试区域 */
.test-area {
    padding: 0 0 3rem;
}

.test-status {
    margin-bottom: 1.5rem;
}

.status-box {
    background-color: var(--apple-card-background);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 4px 20px var(--apple-card-shadow);
    border: 1px solid var(--apple-border);
}

.status-box h3 {
    font-size: 1.1rem;
    color: var(--apple-text);
    margin-bottom: 1rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.dot {
    display: inline-block;
    width: 15px;
    height: 15px;
    border-radius: 50%;
}

.waiting {
    background-color: var(--apple-orange);
    animation: pulse 1.5s infinite;
}

.connected {
    background-color: var(--apple-green);
}

.error {
    background-color: var(--apple-red);
}

@keyframes pulse {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

.status-text {
    font-weight: 500;
}

.test-visualization {
    margin-bottom: 1.5rem;
}

.visual-area {
    background-color: var(--apple-card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 20px var(--apple-card-shadow);
    border: 1px solid var(--apple-border);
}

.visual-area h3 {
    font-size: 1.1rem;
    color: var(--apple-text);
    margin-bottom: 1rem;
    text-align: center;
}

.visualizer-container {
    background-color: var(--apple-black);
    border-radius: 8px;
    overflow: hidden;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.test-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.metric-box {
    background-color: var(--apple-card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 20px var(--apple-card-shadow);
    border: 1px solid var(--apple-border);
}

.metric-box h3 {
    font-size: 1.1rem;
    color: var(--apple-text);
    margin-bottom: 1rem;
    text-align: center;
}

.meter-container {
    padding: 15px 0;
}

.meter {
    height: 30px;
    background-color: var(--apple-gray-lighter);
    border-radius: 15px;
    overflow: hidden;
    position: relative;
}

.meter-fill {
    height: 100%;
    width: 0;
    background: var(--apple-gradient-blue);
    border-radius: 15px;
    transition: width 0.3s ease;
}

.meter-value {
    margin-top: 10px;
    font-weight: 500;
    text-align: center;
}

.test-results {
    background-color: var(--apple-card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 20px var(--apple-card-shadow);
    border: 1px solid var(--apple-border);
}

.test-results h3 {
    font-size: 1.1rem;
    color: var(--apple-text);
    margin-bottom: 1rem;
    text-align: center;
}

.result-container {
    background-color: var(--apple-gray-lighter);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* 推荐区域 */
.recommendations {
    padding: 3rem 0;
    background-color: var(--apple-white);
}

.recommendations h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--apple-text);
    margin-bottom: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.faq-item {
    background-color: var(--apple-card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 20px var(--apple-card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--apple-border);
}

.faq-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.faq-item h3 {
    color: var(--apple-text);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.faq-item h3 i {
    margin-right: 10px;
    color: var(--apple-blue);
}

.cta-box {
    background: var(--apple-gradient-blue);
    color: white;
    text-align: center;
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 122, 255, 0.3);
    overflow: hidden;
    position: relative;
}

.cta-box h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: white;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.cta-box p {
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
}

.cta-box .btn {
    background-color: white;
    color: var(--apple-blue);
    font-weight: 600;
    padding: 0.7rem 1.5rem;
}

.cta-box .btn:hover {
    background-color: rgba(255, 255, 255, 0.9);
}

/* 页脚 */
footer {
    background-color: var(--apple-gray-lighter);
    color: var(--apple-text);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 2.5rem;
}

.footer-logo {
    flex: 1;
    min-width: 250px;
    margin-bottom: 2rem;
}

.footer-logo h2 {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-logo h2 i {
    margin-right: 10px;
    color: var(--apple-blue);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    flex: 2;
    justify-content: space-around;
}

.link-group {
    margin-bottom: 2rem;
    min-width: 150px;
}

.link-group h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--apple-text);
    font-weight: 600;
}

.link-group ul li {
    margin-bottom: 0.8rem;
}

.link-group ul li a {
    color: var(--apple-gray);
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.link-group ul li a:hover {
    color: var(--apple-text);
}

.copyright {
    border-top: 1px solid var(--apple-border);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--apple-gray);
}

/* 响应式设计 */
@media (max-width: 800px) {
    .test-metrics {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-logo {
        margin-bottom: 2rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .cta-box {
        padding: 2rem 1.5rem;
    }
    
    .cta-box h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 600px) {
    header .container {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0.5rem;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .test-action {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

/* 成功信息 */
.success-message {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 1.5rem;
    text-align: center;
}

.success-message i {
    font-size: 3rem;
    color: var(--apple-green);
    margin-bottom: 1rem;
}

.success-message p {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--apple-text);
    margin-bottom: 0;
}