/* ===========================
   启明星官网样式表
   风格：简约清新商务
   主色调：浅蓝 (#E3F2FD) + 白色 (#FFFFFF)
   =========================== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
        sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #FAFAFA;
}

/* ===========================
   导航栏
   =========================== */
.navbar {
    background-color: #ffffff;
    border-bottom: 1px solid #E0E0E0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #1976D2;
    font-size: 24px;
    font-weight: bold;
}

.logo-icon {
    width: 32px;
    height: 32px;
    margin-right: 10px;
    background: linear-gradient(135deg, #2196F3, #64B5F6);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li a {
    text-decoration: none;
    color: #555;
    font-size: 15px;
    padding: 10px 20px;
    transition: color 0.3s;
    border-radius: 5px;
}

.nav-menu li a:hover {
    color: #1976D2;
    background-color: #F5F9FF;
}

/* ===========================
   首屏横幅
   =========================== */
.hero-section {
    background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 100%);
    padding: 80px 20px;
    text-align: center;
}

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

.hero-title {
    font-size: 48px;
    color: #1565C0;
    margin-bottom: 20px;
    font-weight: bold;
}

.hero-subtitle {
    font-size: 24px;
    color: #1976D2;
    margin-bottom: 40px;
}

.hero-slogan {
    font-size: 18px;
    color: #455A64;
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    padding: 14px 40px;
    background-color: #2196F3;
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #1976D2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid #2196F3;
    color: #1976D2;
}

.btn-outline:hover {
    background-color: #2196F3;
    color: white;
}

/* ===========================
   功能介绍
   =========================== */
.features-section {
    padding: 80px 20px;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 36px;
    color: #1565C0;
    margin-bottom: 20px;
    font-weight: bold;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: #78909C;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.feature-card {
    background-color: #FAFAFA;
    border-radius: 12px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s;
    border: 1px solid #ECEFF1;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border-color: #2196F3;
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.feature-title {
    font-size: 22px;
    color: #1976D2;
    margin-bottom: 15px;
    font-weight: 600;
}

.feature-desc {
    font-size: 15px;
    color: #607D8B;
    line-height: 1.8;
}

/* ===========================
   截图展示区
   =========================== */
.screenshots-section {
    padding: 80px 20px;
    background-color: #F5F9FF;
}

.screenshots-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    overflow: hidden;
}

.screenshots-slider {
    display: flex;
    gap: 30px;
    transition: transform 0.5s ease;
}

.screenshot-item {
    min-width: 280px;
    background-color: white;
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    text-align: center;
}

.screenshot-placeholder {
    width: 240px;
    height: 420px;
    background: linear-gradient(145deg, #E3F2FD, #BBDEFB);
    border-radius: 12px;
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64B5F6;
    font-size: 14px;
    position: relative;
    overflow: hidden;
}

.screenshot-placeholder::before {
    content: "";
    position: absolute;
    width: 80%;
    height: 80%;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255, 255, 255, 0.2) 10px,
        rgba(255, 255, 255, 0.2) 20px
    );
}

.screenshot-placeholder span {
    position: relative;
    z-index: 1;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 8px 16px;
    border-radius: 20px;
    color: #1976D2;
    font-weight: 500;
}

.screenshot-title {
    font-size: 16px;
    color: #455A64;
    margin-top: 10px;
}

/* ===========================
   下载区域
   =========================== */
.download-section {
    padding: 80px 20px;
    background: linear-gradient(135deg, #1976D2 0%, #2196F3 100%);
    text-align: center;
    color: white;
}

.download-title {
    font-size: 36px;
    margin-bottom: 20px;
    font-weight: bold;
}

.download-desc {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

.download-btn {
    display: flex;
    align-items: center;
    padding: 16px 40px;
    background-color: white;
    color: #1976D2;
    text-decoration: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.download-btn-icon {
    font-size: 24px;
    margin-right: 12px;
}

.qr-code-area {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.qr-code-placeholder {
    width: 160px;
    height: 160px;
    background-color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.qr-code-inner {
    width: 100%;
    height: 100%;
    background-color: #F5F5F5;
    border: 2px dashed #BDBDBD;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #9E9E9E;
    font-size: 14px;
    text-align: center;
}

/* ===========================
   关于我们
   =========================== */
.about-section {
    padding: 80px 20px;
    background-color: #ffffff;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    font-size: 17px;
    color: #546E7A;
    line-height: 2;
    margin-bottom: 30px;
}

/* ===========================
   页面内容页 (协议页等)
   =========================== */
.content-page {
    padding: 60px 20px;
    background-color: #ffffff;
    min-height: 70vh;
}

.content-container {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.content-container h1 {
    text-align: center;
    font-size: 32px;
    color: #1565C0;
    margin-bottom: 40px;
    font-weight: bold;
}

.content-container h2 {
    font-size: 22px;
    color: #1976D2;
    margin-top: 30px;
    margin-bottom: 15px;
    font-weight: 600;
}

.content-container h3 {
    font-size: 18px;
    color: #2196F3;
    margin-top: 20px;
    margin-bottom: 10px;
    font-weight: 500;
}

.content-container p {
    font-size: 15px;
    color: #455A64;
    margin-bottom: 15px;
    text-indent: 2em;
}

.content-container ul {
    padding-left: 2em;
    margin-bottom: 15px;
}

.content-container ul li {
    font-size: 15px;
    color: #455A64;
    margin-bottom: 8px;
    list-style: disc;
}

.update-date {
    text-align: center;
    color: #90A4AE;
    margin-bottom: 30px;
    font-size: 14px;
}

/* ===========================
   页脚
   =========================== */
.footer {
    background-color: #263238;
    color: #B0BEC5;
    padding: 50px 20px 30px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: #ffffff;
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 500;
}

.footer-section p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 10px;
}

.footer-section a {
    color: #B0BEC5;
    text-decoration: none;
    transition: color 0.3s;
    font-size: 14px;
}

.footer-section a:hover {
    color: #64B5F6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid #37474F;
    padding-top: 25px;
    text-align: center;
    font-size: 13px;
    line-height: 2;
}

.footer-bottom a {
    color: #B0BEC5;
    text-decoration: none;
    margin: 0 10px;
}

.footer-bottom a:hover {
    color: #64B5F6;
}

/* ===========================
   响应式设计
   =========================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}