/* ========== 公共样式 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    background: #f6f7fb;
    color: #3a3f47;
    line-height: 1.75;
}
a { color: #4d5bdf; text-decoration: none; }
ul { list-style: none; }

/* 导航 */
.nav { background: #ffffff; border-bottom: 1px solid #e8ebf1; }
.nav-inner {
    width: 720px; margin: 0 auto;
    padding: 0 24px; height: 58px;
    display: -webkit-box; display: -ms-flexbox; display: flex;
    -webkit-box-align: center; -ms-flex-align: center; align-items: center;
    -webkit-box-pack: justify; -ms-flex-pack: justify; justify-content: space-between;
}
.brand { font-size: 17px; font-weight: 700; color: #3a3f47; }
.nav-links { display: -webkit-box; display: -ms-flexbox; display: flex; }
.nav-links a { font-size: 14px; color: #868d97; margin-left: 26px; }
.nav-links a:hover, .nav-links a.active { color: #4d5bdf; }

/* 主体容器 */
.main { width: 720px; margin: 0 auto; padding: 64px 24px 96px; }

/* 页面标题 */
.page-head { text-align: center; margin-bottom: 56px; }
.page-head h1 { font-size: 28px; font-weight: 700; margin-bottom: 12px; color: #3a3f47; }
.page-head p { font-size: 15px; color: #868d97; }

/* 区块 */
.block { margin-bottom: 48px; }
.block p { font-size: 15px; color: #555; margin-bottom: 12px; }
.block p:last-child { margin-bottom: 0; }
.block-title {
    font-size: 13px; font-weight: 600;
    color: #4d5bdf;
    margin-bottom: 18px;
    padding-left: 10px;
    border-left: 3px solid #4d5bdf;
}

/* 通用卡片 */
.card { background: #ffffff; border: 1px solid #e8ebf1; }

/* 按钮 */
.btn {
    display: inline-block;
    background: #4d5bdf; color: #fff;
    padding: 12px 32px;
    font-size: 14px; font-weight: 600;
    border: 0;
}
.btn:hover { background: #3d4bc9; color: #fff; }
.btn-outline {
    display: inline-block;
    background: #ecf0fd; color: #4d5bdf;
    padding: 11px 32px;
    font-size: 14px; font-weight: 600;
    border: 1px solid #ecf0fd;
}
.btn-outline:hover { background: #4d5bdf; color: #fff; }

/* 软件条目（首页精选 + 作品列表共用） */
.work-item {
    display: block;
    background: #ffffff;
    border: 1px solid #e8ebf1;
    padding: 22px 24px;
    margin-bottom: 14px;
}
.work-item:hover { border-color: #4d5bdf; }
.work-name { font-size: 17px; font-weight: 700; color: #3a3f47; margin-bottom: 6px; }
.work-desc { font-size: 14px; color: #868d97; margin-bottom: 8px; }
.work-meta { font-size: 13px; color: #b0b6bf; }
.work-badge { font-size: 12px; font-weight: 600; padding: 2px 10px; margin-left: 8px; }
.badge-free { color: #2faa5e; background: #e8f6ee; }
.badge-paid { color: #c97a00; background: #fdf3e0; }

/* 列表行 */
.list-row { padding: 11px 0; border-bottom: 1px solid #e8ebf1; font-size: 15px; }
.list-row:last-child { border-bottom: 0; }
.list-key { display: inline-block; width: 96px; color: #868d97; }

/* 页脚 */
.footer { background: #ffffff; border-top: 1px solid #e8ebf1; }
.footer-inner {
    width: 720px; margin: 0 auto;
    padding: 28px 24px; text-align: center;
    font-size: 13px; color: #868d97;
}
.footer-inner a { color: #4d5bdf; }

/* ========== 首页专属 ========== */
.hero {
    background: #ffffff;
    border: 1px solid #e8ebf1;
    padding: 56px 40px;
    text-align: center;
    margin-bottom: 48px;
}
.hero h1 { font-size: 30px; font-weight: 700; margin-bottom: 14px; color: #3a3f47; }
.hero p { font-size: 16px; color: #868d97; max-width: 440px; margin: 0 auto 28px; }

.contact-card {
    background: #ffffff;
    border: 1px solid #e8ebf1;
    text-align: center;
    padding-bottom: 40px;
}
.contact-head { padding: 40px 36px 28px; text-align: center; }
.contact-head h2 { font-size: 22px; font-weight: 700; margin-bottom: 10px; color: #3a3f47; }
.contact-head p { font-size: 15px; color: #868d97; max-width: 440px; margin: 0 auto; }

.skill-list { padding: 8px 0 4px; overflow: hidden; margin-bottom: 24px; }
.skill-item {
    width: 50%;
    padding: 16px 24px;
    float: left;
    text-align: center;
}
.skill-item h3 { font-size: 15px; font-weight: 700; margin-bottom: 4px; color: #3a3f47; }
.skill-item p { font-size: 13px; color: #868d97; }

/* ========== 详情页专属 ========== */
.detail-card { padding: 36px; margin-bottom: 24px; }
.detail-head { margin-bottom: 32px; }
.detail-head h1 { font-size: 28px; font-weight: 700; color: #3a3f47; }
.detail-card .btn { margin-bottom: 48px; }
.feature-list li {
    padding: 9px 0 9px 18px; position: relative;
    font-size: 15px; border-bottom: 1px solid #e8ebf1;
}
.feature-list li:last-child { border-bottom: 0; }
.feature-list li:before {
    content: ""; position: absolute;
    left: 0; top: 22px; width: 6px; height: 6px;
    background: #4d5bdf;
}

/* ========== 关于页专属 ========== */
.about-card { padding: 36px; margin-bottom: 24px; }
.contact-key { width: 100px; }

/* ========== 手机端适配 ========== */
@media (max-width: 720px) {
    .nav-inner, .main, .footer-inner { width: 100%; }
    .main { padding: 32px 16px 64px; }
    .nav-inner { padding: 0 16px; }
    .footer-inner { padding: 24px 16px; }

    /* 首页 */
    .hero { padding: 36px 20px; margin-bottom: 32px; }
    .hero h1 { font-size: 24px; }
    .hero p { font-size: 15px; }
    .contact-head { padding: 28px 20px 20px; }
    .contact-head h2 { font-size: 19px; }
    .contact-head p { font-size: 14px; }
    .skill-item { width: 100%; padding: 12px 20px; }

    /* 页面标题 */
    .page-head { margin-bottom: 36px; }
    .page-head h1 { font-size: 24px; }

    /* 详情页 */
    .detail-card, .about-card { padding: 20px; }
    .detail-head h1 { font-size: 24px; }

    /* 作品条目 */
    .work-item { padding: 18px 16px; }
    .work-name { font-size: 16px; }

    /* 导航链接间距 */
    .nav-links a { margin-left: 18px; }
}