/* ============================================================
   全局重置
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background: linear-gradient(180deg, #050b1f, #071b3d, #031020);
    color: #fff;
}

/* ============================================================
   页面容器
   ============================================================ */
.page {
    max-width: 750px;
    margin: auto;
    min-height: 100vh;
    overflow: hidden;
    position: relative;
}

/* 背景光晕 */
.bg-light {
    position: absolute;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(0, 174, 255, .35), transparent 70%);
    top: -120px;
    right: -120px;
}

/* ============================================================
   头部
   ============================================================ */
.header {
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 2;
}

.logo-box {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-box img {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    box-shadow: 0 0 18px rgba(255, 215, 0, .7);
}

.logo-text h3 {
    font-size: 18px;
    color: #ffd86b;
}

.logo-text p {
    font-size: 13px;
    color: #8fdcff;
}

.top-btn {
    background: linear-gradient(90deg, #ffcc33, #ff7b00);
    color: #401800;
    padding: 10px 18px;
    border-radius: 30px;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
}

/* ============================================================
   Banner 区域
   ============================================================ */
.banner {
    text-align: center;
    padding: 35px 18px 20px;
    position: relative;
    z-index: 2;
}

.app-logo {
    width: 125px;
    height: 125px;
    border-radius: 28px;
    box-shadow: 0 0 35px rgba(255, 215, 0, .8);
}

.title {
    margin-top: 25px;
    font-size: 34px;
    font-weight: 900;
    background: linear-gradient(180deg, #fff6b0, #ffbf00, #ff7b00);
    -webkit-background-clip: text;
    color: transparent;
    text-shadow: 0 4px 20px rgba(255, 174, 0, .25);
}

.subtitle {
    margin-top: 12px;
    font-size: 17px;
    color: #c7eaff;
}

.notice {
    margin: 22px auto;
    width: 90%;
    padding: 12px;
    border: 1px solid rgba(255, 215, 0, .45);
    border-radius: 16px;
    background: rgba(255, 215, 0, .08);
    color: #ffe08a;
    font-size: 15px;
}

/* ============================================================
   主下载按钮
   ============================================================ */
.download-main {
    margin: 22px auto;
    width: 86%;
}

.download-btn {
    display: block;
    width: 100%;
    padding: 18px 0;
    border-radius: 50px;
    background: linear-gradient(90deg, #ffe278, #ff9d00);
    color: #3b1600;
    font-size: 22px;
    font-weight: bold;
    box-shadow: 0 8px 25px rgba(255, 157, 0, .45);
    animation: pulse 1.8s infinite;
    text-decoration: none;
    cursor: pointer;
}

@keyframes pulse {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.035); }
    100% { transform: scale(1); }
}

/* ============================================================
   多线路按钮
   ============================================================ */
.line-box {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    padding: 0 18px;
    margin-top: 20px;
}

.line-box a {
    padding: 12px 0;
    text-align: center;
    border-radius: 30px;
    color: #fff;
    background: linear-gradient(180deg, #0bc7ff, #006dff);
    box-shadow: 0 5px 18px rgba(0, 153, 255, .35);
    font-size: 15px;
    text-decoration: none;
    cursor: pointer;
}

/* ============================================================
   卡片
   ============================================================ */
.card {
    margin: 28px 16px;
    padding: 20px;
    border-radius: 24px;
    background: rgba(255, 255, 255, .08);
    border: 1px solid rgba(255, 255, 255, .12);
    backdrop-filter: blur(8px);
}

.card h3 {
    text-align: center;
    color: #ffd86b;
    margin-bottom: 16px;
    font-size: 22px;
}

/* ============================================================
   平台优势
   ============================================================ */
.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.feature {
    padding: 14px;
    border-radius: 16px;
    background: rgba(0, 0, 0, .22);
    text-align: center;
    color: #cceeff;
    font-size: 14px;
}

/* ============================================================
   安装教程
   ============================================================ */
.guide {
    margin-top: 20px;
}

.step {
    display: flex;
    gap: 12px;
    margin-bottom: 15px;
    align-items: flex-start;
}

.num {
    width: 28px;
    height: 28px;
    background: #ffb300;
    color: #3b1600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step p {
    color: #d9f2ff;
    font-size: 15px;
    line-height: 1.6;
}

/* ============================================================
   底部
   ============================================================ */
.footer {
    text-align: center;
    color: #6f91b8;
    padding: 25px;
    font-size: 13px;
}

/* ============================================================
   悬浮下载栏
   ============================================================ */
.float-download {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    max-width: 750px;
    margin: auto;
    background: rgba(3, 10, 25, .94);
    padding: 12px 16px;
    z-index: 99;
    border-top: 1px solid rgba(255, 215, 0, .25);
}

.float-download a {
    display: block;
    text-align: center;
    padding: 14px;
    border-radius: 40px;
    background: linear-gradient(90deg, #ffdd55, #ff8c00);
    color: #3b1600;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
}

/* ============================================================
   微信遮罩
   ============================================================ */
.mask {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .75);
    z-index: 999;
    padding: 40px 20px;
    color: #fff;
    text-align: center;
}

.mask-box {
    max-width: 420px;
    margin: 80px auto;
    background: #081a35;
    border-radius: 20px;
    padding: 25px;
    border: 1px solid #ffcc33;
}

.mask-box h2 {
    color: #ffcc33;
    margin-bottom: 15px;
}

.mask-box p {
    line-height: 1.8;
    color: #d9f2ff;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 500px) {
    .title {
        font-size: 30px;
    }

    .line-box {
        grid-template-columns: 1fr;
    }
}