* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Microsoft YaHei', 'PingFang SC', Arial, sans-serif;
    background: linear-gradient(135deg, #eef5ff 0%, #dbeafe 100%);
    min-height: 100vh;
    padding: 24px 16px 40px;
}
.wrap {
    max-width: 520px;
    margin: 0 auto;
}
h1 {
    text-align: center;
    color: #1e3a8a;
    font-size: 22px;
    margin-bottom: 8px;
    text-shadow: none;
}
.sub {
    text-align: center;
    color: #1e40af;
    font-size: 14px;
    margin-bottom: 22px;
}
.card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 16px 48px rgba(0,0,0,0.2);
    padding: 22px 18px 28px;
}
.closed-box {
    text-align: center;
    padding: 28px 16px;
    color: #555;
    font-size: 16px;
    line-height: 1.6;
}
.closed-box strong { color: #333; display: block; margin-bottom: 8px; font-size: 18px; }
.tutorial-submit-notice {
    background: #eff6ff;
    color: #1e40af;
    border: 1px solid #93c5fd;
    border-radius: 10px;
    padding: 12px 14px;
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.55;
    text-align: center;
    white-space: pre-line;
}
.tutorial-submit-notice strong { display: inline; font-size: inherit; color: #1e3a8a; }
.step {
    margin-bottom: 28px;
}
.step:last-child { margin-bottom: 0; }
.step-num {
    display: inline-block;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
    margin-bottom: 10px;
}
.step h2 {
    font-size: 17px;
    color: #1a1a1a;
    margin-bottom: 10px;
    line-height: 1.4;
}
.step p {
    font-size: 14px;
    color: #555;
    line-height: 1.65;
    margin-bottom: 14px;
}
.step p.step-text-with-link {
    font-size: 15px;
}
.step a.step-submit-link {
    color: #1d4ed8;
    font-weight: 700;
    font-size: 1.2em;
    text-decoration: underline;
}
.step a.step-submit-link:active {
    color: #1e40af;
}
.tutorial-copy-box {
    margin-bottom: 14px;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid #bfdbfe;
    background: #f8fafc;
}
.tutorial-copy-text {
    display: block;
    margin: 0 0 10px;
    padding: 0;
    font-family: inherit;
    font-size: 13px;
    line-height: 1.55;
    color: #1e293b;
    white-space: pre-wrap;
    word-break: break-all;
    background: transparent;
    border: none;
}
.btn-copy-code {
    display: block;
    width: 100%;
    padding: 11px 14px;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    cursor: pointer;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}
.btn-copy-code:active {
    transform: scale(0.98);
}
.step-open-wrap {
    margin-bottom: 14px;
    text-align: center;
}
.btn-open-app {
    display: inline-block;
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 4px 12px rgba(4, 120, 87, 0.25);
}
.btn-open-app:active {
    opacity: 0.92;
}
.step figure {
    margin: 0;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e8eaf2;
    background: #f8f9fc;
}
.step figure + figure {
    margin-top: 12px;
}
.step img {
    display: block;
    width: 100%;
    height: auto;
    vertical-align: middle;
}
.back {
    text-align: center;
    margin-top: 20px;
}
.back a {
    color: #1d4ed8;
    font-size: 14px;
    text-decoration: underline;
}
.back a:hover { color: #1e40af; }