/* 青龙学术 主题 - 基于 supercustomessay.com 视觉风格 */
:root {
    --sce-primary: #134e4a;
    --sce-primary-dark: #092623;
    --sce-accent: #2dd4bf;
    --sce-bg: #ffffff;
    --sce-sub-bg: #f8f9fa;
    --sce-text: #2c3e50;
    --sce-text2: #4e5969;
    --sce-border: #e5e7eb;
    --sce-gradient1: #ccfbf1;
    --sce-gradient2: #f0fdfa;
    --sce-dark1: #092623;
    --sce-dark2: #134e4a;
    --sce-hero-grad: linear-gradient(135deg, #134e4a, #2dd4bf);
    --sce-about-grad: linear-gradient(135deg, #134e4a, #092623);
    --sce-functions-grad: linear-gradient(to bottom, #f0fdfa, #ccfbf1);
    --sce-security-grad: linear-gradient(135deg, #fdfdfd, #e6ecf3);
    --sce-reviews-grad: linear-gradient(135deg, #134e4a, #092623);
    --sce-app-grad: linear-gradient(135deg, #134e4a, #2dd4bf);
    --sce-footer-grad: linear-gradient(to right, #134e4a, #134e4a);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--sce-text); background: var(--sce-bg); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ============ Header ============ */
.sce-header {
    background: var(--sce-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--sce-border);
}
.sce-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
}
.sce-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--sce-primary);
}
.sce-logo i {
    color: var(--sce-accent);
    font-size: 24px;
}
.sce-nav {
    display: flex;
    gap: 28px;
    align-items: center;
}
.sce-nav a {
    color: var(--sce-text);
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.sce-nav a:hover { color: var(--sce-accent); }
.sce-nav a.sce-cta {
    background: var(--sce-primary);
    color: #fff;
    padding: 8px 18px;
    border-radius: 30px;
    transition: all 0.2s;
}
.sce-nav a.sce-cta:hover {
    background: var(--sce-accent);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* ============ Hero ============ */
.sce-hero {
    background: var(--sce-hero-grad);
    color: #fff;
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}
.sce-hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' viewBox='0 0 40 40'%3E%3Cpath fill='%23ffffff' fill-opacity='0.05' d='M0 0h20v20H0V0zm10 17a7 7 0 1 0 0-14 7 7 0 0 0 0 14zm0-2a5 5 0 1 1 0-10 5 5 0 0 1 0 10zm0-2a3 3 0 1 0 0-6 3 3 0 0 0 0 6z'/%3E%3C/svg%3E");
    pointer-events: none;
}
.sce-hero .container {
    position: relative;
    z-index: 1;
    text-align: center;
}
.sce-hero h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}
.sce-hero h1 .sce-accent { color: #ffe082; }
.sce-hero p {
    font-size: 17px;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}
.sce-hero-ctas {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.sce-btn-hero {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: #fff;
    color: var(--sce-primary);
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.sce-btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
    color: var(--sce-accent);
}
.sce-btn-hero-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s;
}
.sce-btn-hero-outline:hover {
    background: #fff;
    color: var(--sce-primary);
}

/* ============ Section 通用 ============ */
.sce-section {
    padding: 70px 0;
}
.sce-section-alt { background: var(--sce-sub-bg); }
.sce-section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--sce-primary);
    text-align: center;
    margin-bottom: 12px;
}
.sce-section-sub {
    text-align: center;
    color: var(--sce-text2);
    font-size: 16px;
    margin-bottom: 48px;
}

/* ============ About ============ */
.sce-about { background: var(--sce-about-grad); color: #fff; }
.sce-about .sce-section-title { color: #fff; }
.sce-about .sce-section-sub { color: rgba(255,255,255,0.7); }
.sce-about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-top: 24px;
}
.sce-about-card {
    background: rgba(255,255,255,0.06);
    border-radius: 12px;
    padding: 32px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.08);
    transition: transform 0.3s;
}
.sce-about-card:hover { transform: translateY(-4px); }
.sce-about-card h3 {
    color: #fff;
    font-size: 22px;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.sce-about-card h3 i { color: var(--sce-accent); }
.sce-about-card p { color: rgba(255,255,255,0.85); font-size: 15px; line-height: 1.8; }

/* ============ 5 大功能 (Functions) ============ */
.sce-functions { background: var(--sce-functions-grad); }
.sce-functions-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}
.sce-function-item {
    background: #fff;
    border-radius: 12px;
    padding: 28px 20px;
    text-align: center;
    box-shadow: rgba(0, 20, 50, 0.06) 0px 8px 16px 0px;
    transition: all 0.3s;
    border-top: 3px solid var(--sce-accent);
}
.sce-function-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.12);
}
.sce-function-item .sce-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: var(--sce-functions-grad);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sce-primary);
    font-size: 26px;
}
.sce-function-item h3 {
    color: var(--sce-primary);
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: 600;
}
.sce-function-item p {
    color: var(--sce-text2);
    font-size: 14px;
    line-height: 1.6;
}

/* ============ 数据安全 (Security) ============ */
.sce-security { background: var(--sce-security-grad); }
.sce-security-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.sce-security-item {
    background: #fff;
    border-radius: 10px;
    padding: 24px 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: all 0.3s;
}
.sce-security-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}
.sce-security-item i {
    color: var(--sce-accent);
    font-size: 28px;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--sce-functions-grad);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.sce-security-item h4 {
    color: var(--sce-primary);
    font-size: 16px;
    margin-bottom: 6px;
    font-weight: 600;
}
.sce-security-item p {
    color: var(--sce-text2);
    font-size: 13px;
    line-height: 1.5;
}

/* ============ 精选文章 (Articles) ============ */
.sce-news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.sce-news-card {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s;
}
.sce-news-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.sce-news-thumb {
    width: 100%;
    height: 180px;
    background: var(--sce-functions-grad);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sce-primary);
    font-size: 48px;
}
.sce-news-body { padding: 20px; }
.sce-news-body h3 {
    color: var(--sce-primary);
    font-size: 17px;
    margin-bottom: 10px;
    line-height: 1.5;
    font-weight: 600;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.sce-news-body p {
    color: var(--sce-text2);
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.sce-news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #94a3b8;
}
.sce-news-meta a {
    color: var(--sce-accent);
    font-weight: 500;
}
.sce-news-meta a:hover { text-decoration: underline; }

/* ============ 用户评价 (Reviews) ============ */
.sce-reviews { background: var(--sce-reviews-grad); color: #fff; }
.sce-reviews .sce-section-title { color: #fff; }
.sce-reviews .sce-section-sub { color: rgba(255,255,255,0.7); }
.sce-reviews-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
}
.sce-review-card {
    background: rgba(255,255,255,0.06);
    border-radius: 10px;
    padding: 22px 18px;
    border: 1px solid rgba(255,255,255,0.08);
    transition: all 0.3s;
    text-align: center;
}
.sce-review-card:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-4px);
}
.sce-review-avatar {
    width: 50px;
    height: 50px;
    margin: 0 auto 12px;
    background: var(--sce-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    font-weight: 600;
}
.sce-review-stars {
    color: #ffc107;
    font-size: 14px;
    margin-bottom: 10px;
}
.sce-review-card h6 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 8px;
    font-weight: 600;
}
.sce-review-card p {
    color: rgba(255,255,255,0.85);
    font-size: 12px;
    line-height: 1.6;
}

/* ============ 立即下单 CTA ============ */
.sce-app { background: var(--sce-app-grad); color: #fff; }
.sce-app .sce-section-title { color: #fff; }
.sce-app .sce-section-sub { color: rgba(255,255,255,0.8); }
.sce-app-card {
    background: #fff;
    color: var(--sce-text);
    border-radius: 16px;
    padding: 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    max-width: 900px;
    margin: 0 auto;
}
.sce-app-text h3 {
    color: var(--sce-primary);
    font-size: 26px;
    margin-bottom: 16px;
}
.sce-app-text p {
    color: var(--sce-text2);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 22px;
}
.sce-app-ctas {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.sce-btn-app {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    background: var(--sce-primary);
    color: #fff;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
}
.sce-btn-app:hover {
    background: var(--sce-accent);
    transform: translateY(-2px);
    color: #fff;
}
.sce-btn-app-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    background: transparent;
    color: var(--sce-primary);
    border: 2px solid var(--sce-primary);
    border-radius: 30px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
}
.sce-btn-app-outline:hover {
    background: var(--sce-primary);
    color: #fff;
}
.sce-app-qr {
    text-align: center;
    padding: 24px;
    background: var(--sce-sub-bg);
    border-radius: 12px;
}
.sce-app-qr i {
    font-size: 120px;
    color: var(--sce-primary);
}
.sce-app-qr p {
    margin-top: 12px;
    color: var(--sce-text2);
    font-size: 13px;
}

/* ============ Footer ============ */
.sce-footer {
    background: var(--sce-footer-grad);
    color: rgba(255,255,255,0.85);
    padding: 56px 0 0;
}
.sce-footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 36px;
    margin-bottom: 36px;
}
.sce-brand-text {
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 14px;
}
.sce-brand p {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    line-height: 1.7;
}
.sce-footer h5 {
    color: #fff;
    font-size: 15px;
    margin-bottom: 18px;
    font-weight: 600;
    position: relative;
    padding-bottom: 10px;
}
.sce-footer h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--sce-accent);
}
.sce-footer ul {
    list-style: none;
}
.sce-footer ul li {
    margin-bottom: 10px;
}
.sce-footer ul li a {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    transition: color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.sce-footer ul li a:hover { color: #fff; }
.sce-copy {
    text-align: center;
    padding: 22px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
    font-size: 13px;
}

/* ============ 响应式 ============ */
@media (max-width: 992px) {
    .sce-nav { gap: 16px; }
    .sce-nav a:not(.sce-cta) { display: none; }
    .sce-about-grid, .sce-app-card { grid-template-columns: 1fr; }
    .sce-functions-grid { grid-template-columns: repeat(2, 1fr); }
    .sce-security-grid { grid-template-columns: repeat(2, 1fr); }
    .sce-reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .sce-news-grid { grid-template-columns: 1fr; }
    .sce-footer-grid { grid-template-columns: 1fr 1fr; }
    .sce-hero h1 { font-size: 32px; }
}
@media (max-width: 576px) {
    .sce-functions-grid, .sce-security-grid, .sce-news-grid, .sce-reviews-grid, .sce-footer-grid {
        grid-template-columns: 1fr;
    }
    .sce-section { padding: 50px 0; }
    .sce-hero { padding: 60px 0 70px; }
    .sce-section-title { font-size: 26px; }
    .sce-hero h1 { font-size: 26px; }
}