/* APP 下载页 — 暗色星空 + 流动按钮边框 */
.app-download-page {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    box-sizing: border-box;
    padding:
        calc(28px + env(safe-area-inset-top, 0px))
        18px
        calc(32px + env(safe-area-inset-bottom, 0px));
    background: #060812;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* 星空背景层 */
.app-download-page .app-download-sky {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.app-download-page .app-download-nebula {
    position: absolute;
    inset: -20%;
    background:
        radial-gradient(ellipse 55% 45% at 20% 15%, rgba(88, 120, 220, 0.22) 0%, transparent 55%),
        radial-gradient(ellipse 50% 40% at 85% 75%, rgba(180, 100, 200, 0.14) 0%, transparent 50%),
        radial-gradient(ellipse 70% 50% at 50% 100%, rgba(30, 50, 120, 0.35) 0%, transparent 60%),
        linear-gradient(180deg, #0a0f1f 0%, #060812 45%, #03050c 100%);
    animation: app-download-nebula-drift 18s ease-in-out infinite alternate;
}

.app-download-page .app-download-stars {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(1.2px 1.2px at 8% 12%, rgba(255, 255, 255, 0.95) 50%, transparent 100%),
        radial-gradient(1px 1px at 22% 38%, rgba(255, 255, 255, 0.75) 50%, transparent 100%),
        radial-gradient(1.5px 1.5px at 35% 8%, rgba(255, 248, 220, 0.9) 50%, transparent 100%),
        radial-gradient(1px 1px at 48% 55%, rgba(255, 255, 255, 0.6) 50%, transparent 100%),
        radial-gradient(1.2px 1.2px at 62% 22%, rgba(255, 255, 255, 0.85) 50%, transparent 100%),
        radial-gradient(1px 1px at 75% 68%, rgba(255, 255, 255, 0.7) 50%, transparent 100%),
        radial-gradient(1.3px 1.3px at 88% 15%, rgba(255, 255, 255, 0.8) 50%, transparent 100%),
        radial-gradient(1px 1px at 15% 72%, rgba(255, 255, 255, 0.65) 50%, transparent 100%),
        radial-gradient(1.2px 1.2px at 42% 82%, rgba(255, 255, 255, 0.55) 50%, transparent 100%),
        radial-gradient(1px 1px at 58% 42%, rgba(255, 255, 255, 0.7) 50%, transparent 100%),
        radial-gradient(1.4px 1.4px at 92% 48%, rgba(255, 248, 200, 0.85) 50%, transparent 100%),
        radial-gradient(1px 1px at 5% 48%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
        radial-gradient(1px 1px at 28% 58%, rgba(255, 255, 255, 0.6) 50%, transparent 100%),
        radial-gradient(1.2px 1.2px at 68% 88%, rgba(255, 255, 255, 0.75) 50%, transparent 100%),
        radial-gradient(1px 1px at 82% 32%, rgba(255, 255, 255, 0.55) 50%, transparent 100%);
    background-size: 100% 100%;
    animation: app-download-stars-twinkle 4s ease-in-out infinite alternate;
}

.app-download-page .app-download-stars--far {
    background-image:
        radial-gradient(2px 2px at 12% 25%, rgba(255, 255, 255, 0.35) 50%, transparent 100%),
        radial-gradient(1.5px 1.5px at 55% 18%, rgba(200, 220, 255, 0.4) 50%, transparent 100%),
        radial-gradient(2px 2px at 78% 55%, rgba(255, 255, 255, 0.3) 50%, transparent 100%),
        radial-gradient(1.5px 1.5px at 32% 70%, rgba(255, 255, 255, 0.25) 50%, transparent 100%),
        radial-gradient(2px 2px at 90% 82%, rgba(255, 248, 220, 0.35) 50%, transparent 100%);
    opacity: 0.7;
    animation:
        app-download-stars-drift 28s linear infinite,
        app-download-stars-twinkle 6s ease-in-out infinite alternate-reverse;
}

.app-download-page .app-download-shooting {
    position: absolute;
    top: 18%;
    left: -10%;
    width: 120px;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.9) 40%, transparent);
    border-radius: 2px;
    transform: rotate(-25deg);
    opacity: 0;
    animation: app-download-shooting 7s ease-in infinite;
}

.app-download-page .app-download-shooting::after {
    content: "";
    position: absolute;
    top: 55%;
    right: -8%;
    width: 90px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(235, 180, 99, 0.75) 50%, transparent);
    transform: rotate(-18deg);
    animation: app-download-shooting 9s ease-in 3.5s infinite;
}

@keyframes app-download-nebula-drift {
    0% {
        transform: scale(1) translate(0, 0);
    }
    100% {
        transform: scale(1.05) translate(2%, -1%);
    }
}

@keyframes app-download-stars-twinkle {
    0% {
        opacity: 0.55;
    }
    100% {
        opacity: 1;
    }
}

@keyframes app-download-stars-drift {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(-30px);
    }
}

@keyframes app-download-shooting {
    0% {
        opacity: 0;
        transform: translateX(0) rotate(-25deg);
    }
    6% {
        opacity: 1;
    }
    14% {
        opacity: 0;
        transform: translateX(120vw) rotate(-25deg);
    }
    100% {
        opacity: 0;
        transform: translateX(120vw) rotate(-25deg);
    }
}

/* 内容区 */
.app-download-page .app-download-inner {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.app-download-page .app-download-qrcode-wrap {
    display: inline-block;
    line-height: 0;
    padding: 5px;
    background: #fff;
    border: 1px solid rgba(217, 160, 80, 0.85);
    border-radius: 8px;
    box-shadow:
        0 0 24px rgba(235, 180, 99, 0.25),
        0 4px 20px rgba(0, 0, 0, 0.45);
}

.app-download-page .app-download-qrcode {
    display: block;
    width: 140px;
    max-width: 58vw;
    height: auto;
}

/* 顺时针流动边框 */
.app-download-page .app-download-btn-wrap {
    position: relative;
    margin-top: 24px;
    padding: 2px;
    border-radius: 999px;
    overflow: hidden;
    display: inline-block;
    box-shadow: 0 4px 24px rgba(235, 180, 99, 0.2);
}

.app-download-page .app-download-btn-wrap::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 200%;
    height: 200%;
    margin-left: -100%;
    margin-top: -100%;
    background: conic-gradient(
        from 0deg,
        transparent 0deg,
        transparent 50deg,
        #ebb463 90deg,
        #fff8e7 140deg,
        #d9a050 190deg,
        rgba(235, 180, 99, 0.4) 240deg,
        transparent 300deg,
        transparent 360deg
    );
    animation: app-download-border-spin 2.8s linear infinite;
}

@keyframes app-download-border-spin {
    to {
        transform: rotate(360deg);
    }
}

.app-download-page .app-download-btn {
    position: relative;
    z-index: 1;
    display: block;
    min-width: 148px;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
    color: #fff;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    background: linear-gradient(135deg, #c99545 0%, #a87a38 100%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
    transition: transform 0.15s ease;
}

.app-download-page .app-download-btn:active {
    transform: scale(0.97);
}