* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    width: 100%;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    color: #111;
}

.hero {
    width: 100vw;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ffffff 0%, #f0f4f8 100%);
    padding: 20px;
}
.hero-inner {
    width: 100%;
    max-width: 960px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 22px;
}
.app-logo img {
    width: 160px;
    height: 160px;
    border-radius: 32px;
    object-fit: cover;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}
.app-name {
    font-size: 48px;
    font-weight: 700;
    color: #111;
}
.version {
    font-size: 16px;
    color: #666;
}
.desc {
    font-size: 18px;
    line-height: 1.7;
    color: #333;
    max-width: 600px;
    padding: 0 20px;
}
.download {
    display: inline-block;
    margin-top: 10px;
    padding: 18px 60px;
    font-size: 18px;
    font-weight: 500;
    color: #fff;
    background: #007aff;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 10px 25px rgba(0, 122, 255, 0.25);
    transition: all 0.3s ease;
}
.download:hover {
    background: #0066cc;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .hero { padding: 10px; }
    .app-logo img { width: 140px; height: 140px; border-radius: 28px; }
    .app-name { font-size: 38px; }
    .desc { font-size: 17px; }
    .download { padding: 16px 50px; font-size: 17px; width: 85%; max-width: 380px; }
}
@media (max-width: 380px) {
    .app-name { font-size: 34px; }
    .app-logo img { width: 120px; height: 120px; }
}

.login-box {
    max-width: 360px;
    margin: 100px auto;
    padding: 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
}
.login-box h2 {
    margin-bottom: 24px;
    color: #333;
}
.login-box input {
    width: 100%;
    padding: 12px;
    margin-bottom: 16px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}
.login-box button {
    width: 100%;
    padding: 12px;
    background: #409eff;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.admin-container {
    max-width: 700px;
    margin: 40px auto;
    padding: 0 20px;
}
.admin-container h2 {
    text-align: center;
    margin-bottom: 24px;
}
.success {
    background: #e6ffed;
    color: #00b42a;
    padding: 12px;
    border-radius: 6px;
    text-align: center;
    margin-bottom: 20px;
}
.admin-form {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.admin-form h3 {
    margin: 24px 0 16px;
    color: #444;
    border-left: 4px solid #409eff;
    padding-left: 10px;
}
.form-item {
    margin-bottom: 18px;
}
.form-item label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}
.form-item input,
.form-item textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}
.form-item textarea {
    min-height: 80px;
    resize: vertical;
}
.save-btn {
    width: 100%;
    padding: 14px;
    background: #00b42a;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 20px;
}
.save-btn:hover {
    background: #009a25;
}