* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 28px;
    color: rgb(26, 35, 50);
    background: rgb(250, 251, 253);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Banner ===== */
.banner {
    background: linear-gradient(135deg, rgb(30, 58, 95), rgb(37, 99, 235), rgb(14, 165, 233));
    color: #fff;
    text-align: center;
    padding: 64px 24px 56px;
}

.banner h1 {
    font-family: "Noto Serif SC", serif;
    font-size: 32px;
    font-weight: 700;
    line-height: 56px;
    margin-bottom: 12px;
}

.banner .desc {
    font-size: 16px;
    line-height: 28px;
    opacity: 0.88;
    max-width: 720px;
    margin: 0 auto;
}

.banner .meta {
    font-size: 13.12px;
    opacity: 0.7;
    margin-top: 20px;
}

/* ===== Main Content ===== */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 40px 24px 64px;
}

/* ===== Section Title ===== */
.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 23.2px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 3px solid rgb(37, 99, 235);
}

.section-title .badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgb(37, 99, 235);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
}

.section-desc {
    font-size: 14.4px;
    line-height: 25.2px;
    color: rgb(26, 35, 50);
    margin-bottom: 24px;
}

/* ===== Sub Title ===== */
.sub-title {
    font-size: 18.4px;
    font-weight: 600;
    margin: 32px 0 16px;
}

.sub-title-sm {
    font-size: 17.6px;
    font-weight: 600;
    color: rgb(37, 99, 235);
    margin-bottom: 12px;
}

/* ===== Divider ===== */
hr {
    border: none;
    margin: 40px 0;
}

/* ===== Table ===== */
.table-wrap {
    background: #fff;
    border-radius: 8px;
    overflow-x: auto;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    margin-bottom: 24px;
}

.table-wrap table {
    width: 100%;
    min-width: 680px;
    border-collapse: collapse;
    font-size: 14.72px;
}

.table-wrap thead th {
    background: linear-gradient(135deg, rgb(30, 58, 95), rgb(37, 99, 235));
    color: #fff;
    font-weight: 600;
    text-align: left;
    padding: 13.6px 16px;
    white-space: nowrap;
}

.table-wrap tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid rgb(216, 222, 233);
}

.table-wrap tbody tr:nth-child(even) {
    background: rgb(247, 249, 252);
}

.table-wrap tbody tr:hover {
    background: rgb(235, 240, 255);
}

.tag-solution {
    display: inline-block;
    background: rgb(254, 243, 199);
    color: rgb(217, 119, 6);
    font-size: 13.12px;
    font-weight: 600;
    padding: 1.6px 8px;
    border-radius: 3px;
}

.tag-status {
    display: inline-block;
    padding: 2.4px 7.2px;
    border-radius: 3px;
    font-size: 11.52px;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
}

.tag-status.green {
    background: rgb(22, 163, 74);
}

.tag-status.red {
    background: rgb(220, 38, 38);
}

.tag-status.orange {
    background: rgb(217, 119, 6);
}

/* ===== Error Code Card ===== */
.error-card {
    background: #fff;
    border-radius: 8px;
    border: 1px solid rgb(216, 222, 233);
    padding: 24px;
    margin-bottom: 20px;
    transition: box-shadow 0.2s;
}

.error-card:hover {
    box-shadow: rgba(37, 99, 235, 0.1) 0px 4px 12px;
}

.error-card.card-green {
    border-left: 4px solid rgb(22, 163, 74);
}

.error-card.card-orange {
    border-left: 4px solid rgb(217, 119, 6);
}

.error-card.card-red {
    border-left: 4px solid rgb(220, 38, 38);
}

.error-card .card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.error-card .code-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    border-radius: 8px;
    background: rgb(37, 99, 235);
    color: #fff;
    font-size: 14.08px;
    font-weight: 600;
    padding: 0 8px;
    flex-shrink: 0;
}

.error-card .card-header h4 {
    font-size: 17.6px;
    font-weight: 600;
    color: rgb(37, 99, 235);
    margin: 0;
}

.error-card .card-body {
    padding-left: 0;
}

.error-card .card-body p {
    font-size: 14.4px;
    line-height: 25.2px;
    margin-bottom: 12px;
    color: rgb(107, 122, 141);
}

.error-card .step-list {
    list-style: none;
    padding: 0;
}

.error-card .step-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    font-size: 14.4px;
    line-height: 25.2px;
}

.error-card .step-list li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: rgb(37, 99, 235);
}

/* ===== Channel Cards ===== */
.channel-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.channel-card {
    background: rgb(240, 243, 248);
    border: 1px solid rgb(216, 222, 233);
    border-radius: 8px;
    padding: 20.8px;
    transition: box-shadow 0.2s;
}

.channel-card:hover {
    box-shadow: rgba(37, 99, 235, 0.12) 0px 4px 12px;
}

.channel-card .channel-icon {
    font-size: 24px;
    margin-bottom: 8px;
}

.channel-card h5 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: rgb(37, 99, 235);
}

.channel-card p {
    font-size: 14.4px;
    line-height: 25.2px;
    color: rgb(80, 90, 107);
}

.channel-card .contact-link {
    display: inline-block;
    margin-top: 8px;
    color: rgb(37, 99, 235);
    font-size: 14.4px;
    font-weight: 600;
    text-decoration: none;
}

.channel-card .contact-link:hover {
    text-decoration: underline;
}

.channel-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.channel-list li {
    font-size: 14.4px;
    line-height: 25.2px;
    color: rgb(107, 122, 141);
    margin-bottom: 8px;
    padding-left: 0;
    font-weight: 600;
}

.channel-list li:last-child {
    margin-bottom: 0;
}

.channel-list li strong {
    color: rgb(26, 35, 50);
}

/* ===== Info List ===== */
.info-list {
    list-style: none;
    padding: 0;
    margin-bottom: 24px;
}

.info-list li {
    position: relative;
    padding-left: 20px;
    font-size: 14.4px;
    line-height: 25.2px;
    margin-bottom: 4px;
}

.info-list li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: rgb(37, 99, 235);
}

/* ===== Tip Box ===== */
.tip-box {
    background: rgb(240, 243, 248);
    border-left: 4px solid rgb(37, 99, 235);
    border-radius: 0 8px 8px 0;
    padding: 16px 20px;
    margin-bottom: 24px;
    font-size: 14.4px;
    line-height: 25.2px;
}

.tip-box strong {
    color: rgb(37, 99, 235);
}

/* ===== Prepare List ===== */
.prepare-list {
    background: #fff;
    border: 1px solid rgb(216, 222, 233);
    border-left: 4px solid rgb(37, 99, 235);
    border-radius: 8px;
    padding: 20px 24px;
    margin-bottom: 24px;
}

.prepare-list h4 {
    font-size: 17.6px;
    font-weight: 600;
    color: rgb(37, 99, 235);
    margin-bottom: 12px;
}

.prepare-list ul {
    list-style: none;
    padding: 0;
}

.prepare-list ul li {
    position: relative;
    padding-left: 20px;
    font-size: 14.4px;
    line-height: 25.2px;
    margin-bottom: 4px;
}

.prepare-list ul li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: rgb(37, 99, 235);
}

/* ===== Ending ===== */
.ending {
    text-align: center;
    font-size: 16px;
    color: rgb(26, 35, 50);
    padding: 40px 24px;
    border-radius: 8px;
    background: linear-gradient(135deg, rgb(235, 240, 255), rgb(240, 243, 248));
    margin-top: 40px;
}

.ending p {
    margin-bottom: 8px;
}

.ending p:first-child strong {
    color: rgb(37, 99, 235);
}

p.channel-desc {
    color: rgb(26, 35, 50);
    font-size: 14px;
    line-height: 1.6;
    margin-top: 8px;
    font-weight: 600;
}

.qr-grid {
    display: flex;
    gap: 16px;
    margin-top: 12px;
}

.qr-item {
    flex: 1;
    text-align: center;
}

.qr-placeholder {
    width: 100%;
    aspect-ratio: 1;
    max-width: 130px;
    margin: 0 auto;
    background: rgb(240, 243, 248);
    border: 2px dashed rgb(203, 213, 225);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-placeholder span {
    font-size: 11px;
    color: rgb(107, 122, 141);
    text-align: center;
    padding: 8px;
    font-weight: 600;
}

.qr-label {
    font-size: 12px;
    color: rgb(107, 122, 141);
    text-align: center;
    margin-top: 8px;
    font-weight: 600;
}

.qr-img {
    width: 130px;
    height: 130px;
    display: block;
    margin: 0 auto;
    border-radius: 8px;
}

/* ===== Error Code Filter ===== */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
.filter-bar label {
    font-size: 14px;
    color: rgb(26, 35, 50);
    font-weight: 600;
    white-space: nowrap;
}
.filter-bar select {
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid rgb(210, 218, 230);
    border-radius: 6px;
    background: #fff;
    color: rgb(26, 35, 50);
    outline: none;
    cursor: pointer;
    max-width: 180px;
}
.filter-bar select:focus {
    border-color: rgb(37, 99, 235);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

/* ===== Video Tutorial Buttons ===== */
.video-section {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgb(216, 222, 233);
}

.video-section-title {
    font-size: 14.4px;
    font-weight: 600;
    color: rgb(37, 99, 235);
    margin-bottom: 12px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
}

.video-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    background: rgb(240, 243, 248);
    border: 1px solid rgb(216, 222, 233);
    border-radius: 6px;
    text-decoration: none;
    font-size: 13.12px;
    font-weight: 600;
    color: rgb(26, 35, 50);
    transition: all 0.2s;
    cursor: pointer;
}

.video-btn:hover {
    background: rgb(37, 99, 235);
    color: #fff;
    border-color: rgb(37, 99, 235);
    box-shadow: rgba(37, 99, 235, 0.2) 0px 2px 8px;
}

.video-btn .play-icon {
    font-size: 12px;
    line-height: 1;
}

.video-btn:hover .play-icon {
    color: #fff;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .banner h1 {
        font-size: 24px;
        line-height: 40px;
    }

    .banner {
        padding: 48px 16px 40px;
    }

    .container {
        padding: 24px 16px 48px;
    }

    .section-title {
        font-size: 19px;
    }

    .channel-grid {
        grid-template-columns: 1fr;
    }

    .table-wrap table {
        font-size: 13px;
        min-width: 600px;
    }

    .error-card .card-header {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .banner h1 {
        font-size: 20px;
        line-height: 32px;
    }

    .banner .desc {
        font-size: 14px;
    }

    .section-title {
        font-size: 17px;
    }

    .error-card {
        padding: 16px;
    }
}