/* --- 变量定义：Lecon 暖色系 --- */
:root {
    --bg-color: #FDFBF7;        /* 暖米白背景 */
    --text-primary: #5D534A;    /* 深灰褐字体 */
    --text-secondary: #8C857B;  /* 浅灰褐副标 */
    --accent-warm: #E09F7D;     /* 柔和陶土色 */
    --accent-hover: #D08B66;    /* 按钮悬停 */
    --accent-green: #A3B18A;    /* 鼠尾草绿 */
    --card-bg: #FFFFFF;         /* 纯白 */
    --shadow-soft: 0 15px 35px rgba(93, 83, 74, 0.08);
    --border-radius-lg: 30px;
    --border-radius-sm: 12px;
}

/* --- 基础设置 --- */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Nunito', 'Helvetica Neue', sans-serif; /* 英文优先字体 */
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: opacity 0.3s ease;
}

/* 中文模式下的字体微调 */
body[data-lang="zh"] {
    font-family: 'Noto Sans SC', sans-serif;
}

h1, h2, h3, h4 {
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img, svg { max-width: 100%; display: block; }

/* --- 布局容器 --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* --- 按钮组件 --- */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--accent-warm);
    color: white;
    box-shadow: 0 4px 15px rgba(224, 159, 125, 0.3);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--accent-warm);
    color: var(--accent-warm);
    margin-left: 1rem;
}

.btn-secondary:hover { background-color: rgba(224, 159, 125, 0.1); }

/* --- 导航栏 --- */
header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    background-color: rgba(253, 251, 247, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: 0 2px 20px rgba(0,0,0,0.02);
}

nav { display: flex; justify-content: space-between; align-items: center; }

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}
.logo-circle { width: 12px; height: 12px; background: var(--accent-warm); border-radius: 50%; }

.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { font-weight: 600; font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent-warm); }

/* 语言切换开关 */
.lang-switch {
    display: flex;
    border: 1px solid var(--text-secondary);
    border-radius: 20px;
    overflow: hidden;
    cursor: pointer;
    font-size: 0.85rem;
    margin-left: 1rem;
}

.lang-switch span {
    padding: 4px 12px;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
}

.lang-switch span.active {
    background: var(--text-secondary);
    color: white;
}

/* --- 双语控制 (已修复) --- */

/* 关键修复：只隐藏 body 内部的元素，不隐藏 html 标签本身 */
body [lang="en"], body [lang="zh"] {
    display: none;
}

/* 默认英文模式 */
body[data-lang="en"] [lang="en"] { display: block; }
body[data-lang="en"] span[lang="en"] { display: inline; } /* 强制内联元素保持内联 */

/* 中文模式 */
body[data-lang="zh"] [lang="zh"] { display: block; }
body[data-lang="zh"] span[lang="zh"] { display: inline; }


/* --- Hero Section --- */
.hero { padding: 6rem 0 4rem; display: flex; align-items: center; gap: 4rem; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 3.5rem; line-height: 1.2; margin-bottom: 1.5rem; }
.hero-text span.highlight { color: var(--accent-warm); position: relative; }
.hero-text p { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 2.5rem; max-width: 90%; }
.hero-visual { flex: 1; display: flex; justify-content: center; position: relative; }

/* SVG Container */
.abstract-device-container {
    width: 100%;
    max-width: 450px;
    filter: drop-shadow(0 25px 50px rgba(224, 159, 125, 0.25));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* --- Features Section --- */
.features { padding: 4rem 0; background: white; border-radius: var(--border-radius-lg); margin: 2rem 0; box-shadow: var(--shadow-soft); }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 3rem; text-align: center; }
.feature-item i { font-size: 2.2rem; color: var(--accent-green); margin-bottom: 1.2rem; }
.feature-item h3 { margin-bottom: 0.8rem; font-size: 1.2rem; }
.feature-item p { font-size: 0.95rem; color: var(--text-secondary); }

/* --- How it Works (New) --- */
.how-it-works { padding: 6rem 0; }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-top: 3rem; }
.step-card { position: relative; padding: 2rem; border-left: 3px solid #eee; transition: 0.3s; }
.step-card:hover { border-left-color: var(--accent-warm); }
.step-number { font-size: 3rem; font-weight: 800; color: rgba(224, 159, 125, 0.15); position: absolute; top: 10px; right: 20px; line-height: 1; }
.step-card h3 { margin-bottom: 1rem; font-size: 1.3rem; }

/* --- Audience Cards --- */
.audience { padding: 4rem 0 6rem; }
.section-header { text-align: center; margin-bottom: 4rem; max-width: 700px; margin-left: auto; margin-right: auto; }
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }

.card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s;
    border: 1px solid rgba(0,0,0,0.02);
}
.card:hover { transform: translateY(-5px); border-color: var(--accent-warm); }
.card-icon {
    width: 60px; height: 60px; background: var(--bg-color); color: var(--accent-warm);
    border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 1.5rem;
}
.role-tag { color: var(--accent-green); font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; display: block; margin-bottom: 0.5rem; }

/* --- Testimonial (New) --- */
.testimonial { background-color: white; padding: 6rem 0; text-align: center; }
.quote-box { max-width: 800px; margin: 0 auto; }
.quote-text { font-size: 1.4rem; font-style: italic; color: var(--text-primary); margin-bottom: 2rem; line-height: 1.6; }
.quote-author { font-weight: 700; color: var(--accent-warm); }
.quote-role { color: var(--text-secondary); font-size: 0.9rem; margin-top: 0.5rem; }

/* --- FAQ (New) --- */
.faq { padding: 6rem 0; }
.faq-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 3rem; margin-top: 3rem; }
.faq-item h4 { font-size: 1.2rem; margin-bottom: 1rem; color: var(--text-primary); }
.faq-item p { color: var(--text-secondary); font-size: 0.95rem; }

/* --- Footer --- */
footer { padding: 4rem 0 2rem; border-top: 1px solid #eee; background: white; }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 2rem; }
.footer-links a { color: var(--text-secondary); font-size: 0.9rem; margin-right: 2rem; }
.footer-links a:hover { color: var(--accent-warm); }
.copyright { text-align: center; margin-top: 3rem; color: var(--text-secondary); font-size: 0.85rem; }

/* --- Mobile --- */
@media (max-width: 768px) {
    .hero { flex-direction: column; text-align: center; padding: 3rem 0; }
    .hero h1 { font-size: 2.5rem; }
    .features-grid { grid-template-columns: 1fr; }
    .abstract-device-container { max-width: 300px; margin-top: 2rem; }
}

/* --- Contact Page Specific Styles (New) --- */

/* 1. 布局容器：双栏设计 */
.contact-wrapper {
    display: flex;
    align-items: flex-start; /* 顶部对齐 */
    gap: 4rem;
    padding: 4rem 0;
    position: relative;
    min-height: 80vh; /* 保证页面即使内容少也有高度 */
}

/* 2. 左侧：信息与视觉 */
.contact-info-side {
    flex: 1;
    padding-top: 2rem;
    position: relative;
}

.contact-info-side h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.contact-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 90%;
}

/* 联系方式列表 */
.contact-methods {
    margin-bottom: 3rem;
}

.method-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1.2rem;
    background: rgba(255,255,255,0.6);
    border-radius: 20px;
    transition: 0.3s;
}

.method-item:hover {
    background: white;
    transform: translateX(10px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
}

.method-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-color);
    border: 1px solid rgba(224, 159, 125, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-warm);
    font-size: 1.2rem;
}

.method-text h5 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
}

.method-text p {
    font-weight: 600;
    color: var(--text-primary);
}

/* 装饰性背景 Blob */
.decoration-blob {
    position: absolute;
    top: -50px;
    left: -50px;
    width: 500px;
    height: 500px;
    z-index: -1;
    opacity: 0.6;
    pointer-events: none;
}

/* 3. 右侧：悬浮表单卡片 */
.contact-form-side {
    flex: 1;
    width: 100%; /* 确保在手机端占满 */
}

.form-card {
    background: white;
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft); /* 使用与首页一致的柔和阴影 */
    border: 1px solid rgba(255,255,255,0.8);
    position: relative;
    overflow: hidden;
}

/* 表单顶部装饰条 */
.form-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--accent-warm), #FDFBF7);
}

/* 输入框美化 */
.form-group label {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    display: block;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    background-color: #FAFAFA;
    border: 1px solid #EEE;
    border-radius: 12px; /* 圆角增加 */
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    background-color: white;
    border-color: var(--accent-warm);
    box-shadow: 0 0 0 4px rgba(224, 159, 125, 0.1);
    outline: none;
}

/* 响应式适配 */
@media (max-width: 900px) {
    .contact-wrapper {
        flex-direction: column;
        padding-top: 1rem;
        gap: 3rem;
    }

    .contact-info-side h1 {
        font-size: 2.2rem;
    }

    .decoration-blob {
        width: 300px;
        height: 300px;
        top: 0;
    }

    .form-card {
        padding: 2rem;
    }
}

/* --- Privacy Pledge Section (For Index Page) --- */
.privacy-pledge {
    background-color: #F0F2EB; /* 极淡的鼠尾草绿背景，代表安全/许可 */
    padding: 6rem 0;
    text-align: center;
    border-radius: var(--border-radius-lg);
    margin: 2rem 0;
}

.pledge-content {
    max-width: 800px;
    margin: 0 auto;
}

.pledge-icon {
    font-size: 2.5rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
}

.pledge-subtitle {
    font-family: 'Noto Sans SC', sans-serif; /* 此时用正文字体显得更真诚 */
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

.pledge-grid {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.pledge-item {
    flex: 1;
    min-width: 200px;
}

.pledge-item i {
    font-size: 1.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    background: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.pledge-item h4 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.pledge-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.btn-link {
    color: var(--accent-warm);
    font-weight: 700;
    border-bottom: 2px solid transparent;
    padding-bottom: 2px;
}

.btn-link:hover {
    border-bottom-color: var(--accent-warm);
}

/* --- Full Privacy Page Styles (For privacy.html) --- */
.legal-page {
    padding: 4rem 0;
    max-width: 900px; /* 限制宽度以提高阅读体验 */
}

.legal-header {
    text-align: center;
    margin-bottom: 4rem;
}

.legal-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.last-updated {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2rem;
}

.intro-text {
    font-size: 1.2rem;
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto;
}

.legal-content section {
    margin-bottom: 4rem;
}

.legal-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.legal-content p, .legal-content li {
    font-size: 1.05rem;
    color: #666; /* 稍微深一点的灰色用于正文 */
    line-height: 1.8;
    margin-bottom: 1rem;
}

.legal-content ul {
    list-style: disc;
    padding-left: 1.5rem;
}

/* Privacy Comparison Grid */
.policy-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.policy-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid #eee;
}

.policy-card.check { border-top: 4px solid var(--accent-green); }
.policy-card.cross { border-top: 4px solid #E07D7D; }

.policy-card h4 { margin-bottom: 1rem; display: flex; align-items: center; gap: 10px; }
.policy-card.check i { color: var(--accent-green); }
.policy-card.cross i { color: #E07D7D; }

.policy-card ul { list-style: none; padding: 0; }
.policy-card li {
    font-size: 0.95rem;
    border-bottom: 1px solid #f9f9f9;
    padding: 10px 0;
    margin: 0;
}
.policy-card li:last-child { border: none; }

/* Mobile Adaption */
@media (max-width: 768px) {
    .policy-grid { grid-template-columns: 1fr; }
    .pledge-grid { flex-direction: column; gap: 2rem; }
}