.user-body {
    --u-brand: #2563eb;
    --u-brand-light: #3b82f6;
    --u-text: #1e293b;
    --u-text-secondary: #64748b;
    --u-text-light: #94a3b8;
    --u-border: #e2e8f0;
    --u-border-light: #f1f5f9;
    --u-page: #f8fafc;
    --u-card: #ffffff;
    margin: 0;
    min-height: 100vh;
    padding: 24px 16px 40px;
    color: var(--u-text);
    background: var(--u-page);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.65;
}

.user-app-shell {
    width: min(700px, 100%);
    margin: 0 auto;
}

.user-main {
    width: 100%;
    min-height: 0;
    margin: 0;
    padding: 0;
}

.user-profile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    padding-bottom: 24px;
}

.user-profile {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-profile > img,
.user-profile > .avatar-fallback {
    width: 40px;
    height: 40px;
    flex: 0 0 auto;
    border: 1px solid var(--u-border);
    border-radius: 50%;
    object-fit: cover;
}

.user-profile > span:last-child {
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.user-profile strong {
    max-width: 230px;
    overflow: hidden;
    color: var(--u-text);
    font-size: 12px;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-profile small {
    color: var(--u-text-secondary);
    font-size: 10px;
}

.user-mini-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.user-mini-nav a {
    padding: 5px 9px;
    color: var(--u-text-secondary);
    border-radius: 6px;
    font-size: 12px;
}

.user-mini-nav a:hover,
.user-mini-nav a.active {
    color: var(--u-brand);
    background: #eff6ff;
}

.user-exit-link {
    padding: 6px 12px;
    color: var(--u-text-secondary);
    background: var(--u-card);
    border: 1px solid var(--u-border);
    border-radius: 6px;
    font-size: 12px;
}

.user-exit-link:hover {
    color: var(--u-brand);
    background: var(--u-border-light);
}

.user-body .alert {
    margin-bottom: 16px;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 14px;
}

.user-section-card {
    display: block;
    margin-bottom: 20px;
    overflow: hidden;
    background: var(--u-card);
    border: 1px solid var(--u-border);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
}

.user-action-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    transition: background .2s ease, border-color .2s ease;
}

.user-action-card:hover {
    background: var(--u-page);
    border-color: #bfdbfe;
}

.user-card-header {
    min-height: 56px;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid var(--u-border);
}

.home-collapse-header {
    width: 100%;
    margin: 0;
    color: inherit;
    background: var(--u-card);
    border: 0;
    border-bottom: 1px solid transparent;
    border-radius: 0;
    text-align: left;
    cursor: pointer;
    user-select: none;
}

.home-collapse-header:hover {
    background: var(--u-page);
}

.home-collapse-header .user-card-arrow {
    transition: transform .2s ease;
}

.home-collapse-header .user-card-arrow.open {
    transform: rotate(180deg);
}

.home-collapse-body {
    max-height: 0;
    padding: 0 20px;
    overflow: hidden;
    transition: max-height .3s ease, padding .3s ease;
}

.home-collapse-body.open {
    max-height: 3000px;
    padding: 20px;
    border-top: 1px solid var(--u-border);
}

.user-card-title {
    display: inline-flex;
    align-items: center;
    color: var(--u-text);
    font-size: 16px;
    font-weight: 500;
}

.user-card-title img {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    object-fit: contain;
}

.user-card-arrow {
    color: var(--u-text-light);
    font-size: 13px;
    line-height: 1;
}

.ticket-total {
    color: var(--u-text-light);
    font-size: 12px;
}

.user-card-body {
    padding: 20px;
}

.user-body .filter-tabs {
    margin: 0 0 18px;
    padding-bottom: 2px;
    gap: 7px;
}

.user-body .filter-tabs a {
    padding: 6px 10px;
    color: var(--u-text-secondary);
    background: #fff;
    border: 1px solid var(--u-border);
    border-radius: 6px;
    font-size: 12px;
}

.user-body .filter-tabs a.active {
    color: var(--u-brand);
    background: #eff6ff;
    border-color: #93c5fd;
}

.reference-ticket-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.reference-ticket-item {
    padding: 16px;
    border: 1px solid var(--u-border);
    border-radius: 6px;
}

.reference-ticket-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.reference-ticket-top strong {
    min-width: 0;
    overflow: hidden;
    color: var(--u-text);
    font-size: 15px;
    font-weight: 500;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reference-ticket-no {
    margin-bottom: 10px;
    color: var(--u-text-light);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 11px;
}

.reference-ticket-summary {
    margin: 0 0 12px;
    color: var(--u-text-secondary);
    font-size: 13px;
}

.reference-ticket-meta {
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--u-text-secondary);
    font-size: 13px;
}

.reference-ticket-meta span {
    display: flex;
    align-items: center;
}

.reference-ticket-meta img {
    width: 15px;
    height: 15px;
    margin-right: 5px;
    object-fit: contain;
}

.reference-ticket-link {
    display: inline-block;
    padding: 6px 14px;
    color: var(--u-brand);
    border: 1px solid var(--u-brand);
    border-radius: 6px;
    font-size: 13px;
    transition: color .2s ease, background .2s ease;
}

.reference-ticket-link:hover {
    color: #fff;
    background: var(--u-brand);
}

.user-body .status {
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
}

.user-body .status-pending {
    color: #b45309;
    background: #fef3c7;
}

.user-body .status-processing {
    color: #b91c1c;
    background: #fee2e2;
}

.user-body .status-resolved {
    color: #065f46;
    background: #d1fae5;
}

.user-body .status-closed {
    color: #475569;
    background: #e2e8f0;
}

.user-empty {
    margin: 0 12px;
    padding: 60px 20px;
    text-align: center;
    color: var(--u-text-light);
    background: #fff;
    border-radius: 20px;
}

.user-empty img {
    width: 120px;
    height: 120px;
    margin-bottom: 10px;
    object-fit: contain;
}

.user-empty p {
    margin-bottom: 0;
    font-size: 14px;
}

.user-empty a {
    color: var(--u-brand);
    font-size: 13px;
}

.user-reply-modal {
    position: fixed;
    inset: 0;
    z-index: 999;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, .4);
}

.user-reply-modal[hidden] { display: none; }

.user-reply-modal-box {
    width: min(320px, 100%);
    padding: 24px 20px;
    text-align: center;
    background: #fff;
    border: 1px solid var(--u-border);
    border-radius: 8px;
}

.user-reply-modal-box h2 {
    margin-bottom: 8px;
    color: var(--u-text);
    font-size: 18px;
    font-weight: 500;
}

.user-reply-modal-box p {
    margin-bottom: 18px;
    color: var(--u-text-secondary);
    font-size: 14px;
}

.user-reply-modal-box button {
    min-height: 40px;
    padding: 9px 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
}

.user-reply-modal-box button {
    padding-inline: 30px;
    color: #fff;
    background: var(--u-brand);
    border: 0;
}

.reference-page-nav {
    padding-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.reference-page-nav a {
    padding: 6px 12px;
    color: var(--u-text-secondary);
    background: #fff;
    border: 1px solid var(--u-border);
    border-radius: 6px;
    font-size: 13px;
}

.reference-page-nav a:hover {
    color: var(--u-brand);
    background: var(--u-border-light);
}

.reference-page-nav span {
    color: var(--u-text);
    font-size: 17px;
    font-weight: 600;
}

.form-intro {
    margin-bottom: 20px;
    color: var(--u-text-secondary);
    font-size: 13px;
}

.reference-form-group {
    margin-bottom: 18px;
}

.reference-form-group label,
.user-body fieldset legend {
    display: block;
    margin-bottom: 6px;
    color: var(--u-text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.reference-form-group label span {
    color: #ef4444;
}

.reference-form-group label small {
    color: var(--u-text-light);
    font-size: 11px;
    font-weight: 400;
}

.reference-form-group input,
.reference-form-group textarea,
.reference-form-group select {
    width: 100%;
    margin: 0;
    padding: 11px 14px;
    color: var(--u-text);
    background: #fff;
    border: 1px solid var(--u-border);
    border-radius: 6px;
    font-size: 15px;
    box-shadow: none;
}

.reference-form-group input:focus,
.reference-form-group textarea:focus,
.reference-form-group select:focus {
    border-color: var(--u-brand);
    box-shadow: none;
}

.reference-form-group textarea {
    min-height: 90px;
}

.reference-form-group select {
    appearance: none;
    padding-right: 40px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='%2364748b'%3E%3Cpath d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}

.user-body fieldset {
    margin: 0 0 20px;
}

.user-body .radio-row {
    gap: 8px;
}

.user-body .radio-card span {
    padding: 9px;
    color: var(--u-text-secondary);
    border-color: var(--u-border);
    border-radius: 6px;
}

.user-body .radio-card input:checked + span {
    color: var(--u-brand);
    background: #eff6ff;
    border-color: var(--u-brand);
}

.user-body .char-count {
    margin-top: 4px;
    color: var(--u-text-light);
    font-size: 11px;
}

.reference-submit {
    width: 100%;
    min-height: 44px;
    padding: 11px 16px;
    color: #fff;
    background: var(--u-brand);
    border: 0;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background .2s ease;
}

.reference-submit:hover {
    background: var(--u-brand-light);
}

.reference-submit:disabled {
    opacity: .7;
    cursor: not-allowed;
}

.detail-body {
    padding-block: 12px;
}

.reference-detail-row {
    padding: 8px 0;
    display: flex;
    gap: 12px;
    border-bottom: 1px solid var(--u-border-light);
    font-size: 13px;
}

.reference-detail-row:last-child {
    border-bottom: 0;
}

.reference-detail-row span {
    width: 82px;
    flex: 0 0 auto;
    color: var(--u-text-secondary);
}

.reference-detail-row strong {
    min-width: 0;
    color: var(--u-text);
    font-weight: 500;
    word-break: break-all;
}

.reference-message-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.reference-message {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 14px;
    word-break: break-word;
}

.reference-message.msg-user {
    align-self: flex-end;
    color: #fff;
    background: var(--u-brand);
    border-bottom-right-radius: 4px;
}

.reference-message.msg-admin {
    align-self: flex-start;
    color: var(--u-text);
    background: var(--u-border-light);
    border: 1px solid var(--u-border);
    border-bottom-left-radius: 4px;
}

.reference-message-meta {
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
    gap: 14px;
    font-size: 11px;
    opacity: .78;
}

.reference-message-meta strong {
    font-weight: 500;
}

.reference-message-meta time {
    white-space: nowrap;
}

.user-body .reference-message.msg-user .image-upload,
.user-body .reference-message.msg-admin .image-upload { color: var(--u-text); }

.user-body .attachment-thumb {
    width: 112px;
    height: 112px;
    border-color: rgba(255,255,255,.35);
    border-radius: 6px;
}

.user-body .reference-message.msg-admin .attachment-thumb {
    border-color: var(--u-border);
}

.user-body .image-upload { margin-top: 0; }

.user-body .reference-form .image-upload {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.user-body .reference-form .image-upload > p {
    width: 100%;
    flex: 0 0 100%;
}

.user-body .reference-form .image-upload-preview {
    margin: 0;
    padding: 0;
    gap: 10px;
    background: transparent;
    border: 0;
}

.user-body .reference-form .image-upload-preview img {
    width: auto;
    max-width: 100px;
    height: 56px;
    border: 1px solid var(--u-border);
    border-radius: 4px;
}

.user-body .reference-form .image-upload-preview span {
    display: none;
}

.user-body .reference-form .image-upload-preview button {
    width: 26px;
    height: 26px;
}

.user-body .image-upload-button {
    color: var(--u-text-secondary);
    background: var(--u-page);
    border-color: var(--u-border);
    border-radius: 6px;
    transition: opacity .2s ease, color .2s ease, border-color .2s ease;
}

.user-body .image-upload-button:hover {
    color: var(--u-brand);
    border-color: var(--u-brand);
}

.user-body .image-upload-button.hidden {
    width: 0;
    min-height: 0;
    padding: 0;
    margin: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    border: 0;
}

.user-body .closed-note {
    margin-top: 0;
    color: var(--u-text-secondary);
    background: #e2e8f0;
    border-radius: 6px;
    font-size: 13px;
}

.user-footer {
    margin-top: 30px;
    padding-top: 16px;
    color: var(--u-text-light);
    border-top: 1px solid var(--u-border);
    text-align: center;
    font-size: 12px;
}

.back-top {
    position: fixed;
    right: 16px;
    bottom: 28px;
    z-index: 40;
    width: 44px;
    height: 44px;
    padding: 0;
    display: grid;
    place-items: center;
    visibility: hidden;
    opacity: 0;
    background: transparent;
    border: 0;
    border-radius: 50%;
    cursor: pointer;
    transition: opacity .25s ease;
}

.back-top.show {
    visibility: visible;
    opacity: 1;
}

.back-top img {
    width: 42px;
    height: 42px;
    object-fit: contain;
}

.user-login-main {
    min-height: calc(100vh - 120px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.user-login-main > .alert { width: min(420px, 100%); }

.user-body .user-login-card {
    width: min(420px, 100%);
    margin: 0;
    padding: 36px 30px;
    border: 1px solid var(--u-border);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .08);
}

.user-body .user-login-card .login-symbol {
    background: var(--u-brand);
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(37, 99, 235, .2);
}

.user-body .user-login-card .eyebrow {
    color: var(--u-brand);
}

.user-body .user-login-card .button { border-radius: 6px; }

.user-body .user-login-card h1 {
    color: var(--u-text);
    font-size: 26px;
}

@media (max-width: 480px) {
    .user-body {
        padding: 16px 12px 30px;
    }

    .user-profile-header {
        padding-bottom: 18px;
    }

    .user-profile strong {
        max-width: 130px;
    }

    .user-action-card,
    .user-card-header {
        padding: 14px 16px;
    }

    .user-card-body {
        padding: 14px;
    }

    .home-collapse-header {
        padding: 14px 16px;
    }

    .home-collapse-body.open {
        padding: 16px;
    }

    .user-section-card {
        margin-bottom: 20px;
        border-radius: 8px;
    }

    .reference-ticket-item {
        padding: 14px;
    }

    .reference-ticket-top {
        align-items: flex-start;
    }

    .reference-message {
        max-width: 92%;
        padding: 11px 13px;
    }

    .reference-message-meta {
        flex-wrap: wrap;
        gap: 2px 10px;
    }

    .reference-form-group input,
    .reference-form-group textarea,
    .reference-form-group select {
        min-height: 46px;
        font-size: 16px;
    }

    .reference-submit {
        min-height: 48px;
        font-size: 16px;
    }

    .user-body .radio-card span {
        min-height: 44px;
        display: grid;
        place-items: center;
    }

    .user-body .image-upload-button {
        min-height: 44px;
        padding-inline: 18px;
    }

    .user-body .image-upload-preview {
        padding: 8px;
    }

    .user-body .reference-form .image-upload-preview {
        padding: 0;
    }

    .user-body .attachment-thumb {
        width: min(132px, 36vw);
        height: min(132px, 36vw);
    }

    .image-viewer {
        padding: 60px 10px 20px;
    }

    .reference-page-nav {
        padding: 0 2px 14px;
    }

    .back-top {
        right: 12px;
        bottom: 24px;
        width: 40px;
        height: 40px;
    }

    .back-top img {
        width: 40px;
        height: 40px;
    }

    .user-footer {
        margin-top: 20px;
        padding-bottom: 5px;
    }

    .user-login-main {
        min-height: calc(100vh - 80px);
    }

    .user-body .user-login-card {
        padding: 30px 22px;
    }
}