.activity-list {
    display: flex;
    flex-direction: column;
    min-height: calc(100dvh - 11rem);
    background:
        radial-gradient(ellipse 80% 50% at 100% 0%, rgba(147, 197, 253, 0.35), transparent 55%),
        radial-gradient(ellipse 70% 45% at 0% 100%, rgba(196, 181, 253, 0.22), transparent 50%),
        linear-gradient(165deg, #eff6ff 0%, #f8fafc 42%, #faf5ff 100%);
}

.activity-list-inner {
    max-width: 1440px;
    margin-left: auto;
    margin-right: auto;
    padding: 2.5rem 1rem 3.5rem;
}

.activity-list-title {
    margin: 0 0 1.75rem;
    font-size: 1.75rem;
    font-weight: 600;
}

.activity-list-item {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    color: inherit;
    text-decoration: none;
    background: #fff;
    border: 1px solid #e8ecf0;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.activity-list-item:hover {
    border-color: #dbe3ec;
    box-shadow: 0 8px 24px rgba(30, 104, 173, 0.08);
}

.activity-list-cover {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.activity-list-cover img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.activity-list-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 1.25rem 1.5rem 1.5rem;
}

.activity-list-item-title {
    margin: 0 0 0.75rem;
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
    transition: color 0.2s ease;
}

.activity-list-item:hover .activity-list-item-title {
    color: #2563eb;
}

.activity-list-intro {
    margin: 0 0 1rem;
    line-height: 1.6;
    color: #64748b;
}

.activity-list-meta {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin: 0 0 0.375rem;
    line-height: 1.5;
    color: #64748b;
}

.activity-list-meta:last-child {
    margin-bottom: 0;
}

.activity-list-meta .bi {
    flex-shrink: 0;
    margin-top: 0.125rem;
}

/**
 * Activity detail
 */
.activity-detail {
    background-color: #f8fafc;
    padding-top: 1.25rem;
}

.activity-detail-inner {
    max-width: 1440px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem 3.5rem;
}

.activity-detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 1.5rem;
    align-items: start;
}

.activity-detail-main {
    min-width: 0;
    overflow: hidden;
    background: #fff;
    border: 1px solid #e8ecf0;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.activity-detail-cover {
    overflow: hidden;
    max-height: 400px;
    background: #e2e8f0;
}

.activity-detail-cover img {
    display: block;
    width: 100%;
    height: 100%;
    max-height: 400px;
    object-fit: cover;
}

.activity-detail-main-body {
    padding: 2rem 2.5rem 2.5rem;
}

.activity-detail-title {
    margin: 0 0 1.5rem;
    font-size: 1.75rem;
    font-weight: 600;
    line-height: 1.35;
}

.activity-detail-intro {
    margin: 0 0 1.5rem;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    line-height: 1.7;
    color: #475569;
    background: #f8fafc;
    border-left: 4px solid #2563eb;
    border-radius: 0 8px 8px 0;
}

.activity-detail-sidebar {
    min-width: 0;
}

.activity-detail-sidebar-card {
    position: sticky;
    top: 1.5rem;
    padding: 1.5rem;
    background: #fff;
    border: 1px solid #e8ecf0;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.activity-detail-sidebar-title {
    margin: 0 0 1.25rem;
    padding-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
    border-bottom: 1px solid #e8ecf0;
}

.activity-detail-sidebar-item {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    padding: 0.875rem 0;
    border-bottom: 1px solid #f1f5f9;
}

.activity-detail-sidebar-item:first-of-type {
    padding-top: 0;
}

.activity-detail-sidebar-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.activity-detail-sidebar-label {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.activity-detail-sidebar-value {
    font-size: 1rem;
    line-height: 1.5;
    color: #0f172a;
    word-break: break-word;
}

.activity-registration-app[hidden] {
    display: none !important;
}

.activity-registration-app {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid #e8ecf0;
}

.activity-register-btn.el-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    height: 3rem;
    padding: 0 1.25rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.activity-register-btn.el-button:hover,
.activity-register-btn.el-button:focus {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    box-shadow: 0 14px 28px rgba(37, 99, 235, 0.34);
    filter: brightness(1.02);
}

.activity-register-btn.el-button:active {
    transform: translateY(1px);
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.24);
}

.activity-register-btn.el-button.is-disabled,
.activity-register-btn.el-button.is-disabled:hover,
.activity-register-btn.el-button.is-disabled:focus,
.activity-register-btn.el-button.is-disabled:active {
    color: #94a3b8;
    background: #e2e8f0;
    box-shadow: none;
    transform: none;
    filter: none;
    cursor: not-allowed;
}

.activity-register-btn .bi {
    font-size: 1.125rem;
}

.activity-registration-desc {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    margin: 0 0 1.5rem;
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: #475569;
    background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
    border: 1px solid #dbeafe;
    border-radius: 10px;
}

.activity-registration-desc .bi {
    flex-shrink: 0;
    margin-top: 0.125rem;
    font-size: 1rem;
    color: #2563eb;
}

.activity-registration-dialog.el-dialog {
    --el-dialog-border-radius: 16px;
    --el-dialog-box-shadow: 0 24px 64px rgba(15, 23, 42, 0.16);
    --el-dialog-padding-primary: 0;
    --el-index-popper: 3100;
    overflow: hidden;
    max-width: calc(100vw - 2rem);
    border: 1px solid #e8ecf0;
}

body > .el-overlay.activity-registration-overlay,
.el-overlay.activity-registration-overlay {
    z-index: 3000 !important;
    background-color: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
}

.activity-registration-popper {
    z-index: 3100 !important;
}

.activity-registration-dialog-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 1.75rem 1.25rem;
    background:
        radial-gradient(ellipse 80% 120% at 100% 0%, rgba(147, 197, 253, 0.35), transparent 60%),
        linear-gradient(135deg, #eff6ff 0%, #f8fafc 55%, #fff 100%);
    border-bottom: 1px solid #e8ecf0;
}

.activity-registration-dialog-header-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    border-radius: 12px;
    color: #fff;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
}

.activity-registration-dialog-header-icon .bi {
    font-size: 1.375rem;
}

.activity-registration-dialog-title {
    margin: 0 0 0.25rem;
    font-size: 1.375rem;
    font-weight: 600;
    line-height: 1.35;
    color: #0f172a;
}

.activity-registration-dialog-subtitle {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: #64748b;
}

.activity-registration-dialog .el-dialog__header {
    margin-right: 0;
    padding: 0;
}

.activity-registration-dialog .el-dialog__headerbtn {
    top: 1.125rem;
    right: 1.125rem;
    width: 2rem;
    height: 2rem;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.activity-registration-dialog .el-dialog__headerbtn:hover {
    background-color: rgba(15, 23, 42, 0.06);
}

.activity-registration-dialog .el-dialog__headerbtn .el-dialog__close {
    font-size: 1.125rem;
    color: #64748b;
}

.activity-registration-dialog-content {
    padding: 0 1.75rem 0.25rem;
}

.activity-registration-dialog .el-dialog__body {
    max-height: min(calc(100vh - 10rem), 680px);
    overflow-x: hidden;
    overflow-y: auto;
    padding: 1.25rem 0 0;
}

.activity-registration-section {
    margin-bottom: 1.25rem;
    padding: 1.25rem 1.25rem 0.25rem;
    background: #f8fafc;
    border: 1px solid #eef2f6;
    border-radius: 12px;
}

.activity-registration-section--last {
    margin-bottom: 0;
}

.activity-registration-section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    padding-bottom: 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #475569;
    border-bottom: 1px solid #e8ecf0;
}

.activity-registration-section-title::before {
    content: "";
    display: block;
    width: 0.25rem;
    height: 1rem;
    border-radius: 999px;
    background: linear-gradient(180deg, #2563eb 0%, #60a5fa 100%);
}

.activity-registration-form .el-row {
    margin-right: 0 !important;
    margin-left: 0 !important;
}

.activity-registration-form .el-row > .el-col {
    padding-right: 10px;
    padding-left: 10px;
}

.activity-registration-dialog .el-dialog__footer {
    padding: 1rem 1.75rem 1.5rem;
    background: #fff;
    border-top: 1px solid #e8ecf0;
}

.activity-registration-dialog-footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.75rem;
}

.activity-registration-dialog-footer .el-button + .el-button {
    margin-left: 0;
}

.activity-registration-btn-cancel.el-button,
.activity-registration-btn-reset.el-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    min-width: 5.5rem;
    height: 2.625rem;
    padding: 0 1.125rem;
    font-weight: 500;
    border-radius: 10px;
}

.activity-registration-btn-reset.el-button {
    color: #475569;
    border-color: #cbd5e1;
}

.activity-registration-btn-reset.el-button:hover {
    color: #2563eb;
    border-color: #93c5fd;
    background-color: #eff6ff;
}

.activity-registration-btn-submit.el-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-width: 11rem;
    height: 2.75rem;
    padding: 0 1.375rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.activity-registration-btn-submit.el-button:hover,
.activity-registration-btn-submit.el-button:focus {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.34);
    filter: brightness(1.02);
}

.activity-registration-btn-submit.el-button:active {
    transform: translateY(1px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.24);
}

.activity-registration-form .el-form-item {
    margin-bottom: 1.125rem;
}

.activity-registration-form .el-form-item__label {
    margin-bottom: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #334155;
    line-height: 1.4;
}

.activity-registration-form .el-input__wrapper,
.activity-registration-form .el-select__wrapper,
.activity-registration-form .el-date-editor .el-input__wrapper {
    min-height: 2.625rem;
    border-radius: 10px;
    box-shadow: 0 0 0 1px #dbe3ec inset;
    transition: box-shadow 0.2s ease, background-color 0.2s ease;
}

.activity-registration-form .el-input-number {
    width: 100%;
    line-height: normal;
}

.activity-registration-form .el-input-number .el-input {
    flex: 1;
    min-width: 0;
}

.activity-registration-form .el-input-number .el-input__wrapper {
    min-height: 2.625rem;
    border-radius: 10px 0 0 10px;
    box-shadow: 0 0 0 1px #dbe3ec inset;
    transition: box-shadow 0.2s ease, background-color 0.2s ease;
}

.activity-registration-form .el-input-number__decrease,
.activity-registration-form .el-input-number__increase {
    width: 2.5rem;
    height: auto;
    color: #64748b;
    background: #f8fafc;
    border-color: #dbe3ec;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.activity-registration-form .el-input-number__decrease:hover,
.activity-registration-form .el-input-number__increase:hover {
    color: #2563eb;
    background: #eff6ff;
}

.activity-registration-form .el-input-number.is-controls-right .el-input-number__increase {
    border-top-right-radius: 10px;
}

.activity-registration-form .el-input-number.is-controls-right .el-input-number__decrease {
    border-bottom-right-radius: 10px;
}

.activity-registration-form .el-input__wrapper:hover,
.activity-registration-form .el-select__wrapper:hover,
.activity-registration-form .el-date-editor .el-input__wrapper:hover,
.activity-registration-form .el-input-number .el-input__wrapper:hover {
    box-shadow: 0 0 0 1px #93c5fd inset;
}

.activity-registration-form .el-input__wrapper.is-focus,
.activity-registration-form .el-select__wrapper.is-focused,
.activity-registration-form .el-date-editor .el-input__wrapper.is-focus,
.activity-registration-form .el-input-number .el-input__wrapper.is-focus {
    box-shadow: 0 0 0 1px #2563eb inset, 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.activity-registration-form .el-input-number.is-focus .el-input-number__decrease,
.activity-registration-form .el-input-number.is-focus .el-input-number__increase {
    border-color: #2563eb;
}

.activity-registration-form .el-input,
.activity-registration-form .el-select,
.activity-registration-form .el-date-editor,
.activity-registration-form .el-input-number {
    width: 100%;
}

.activity-registration-form .el-date-editor {
    --el-date-editor-width: 100%;
}

.activity-registration-number,
.activity-registration-date {
    width: 100%;
    display: block;
}

.activity-registration-form .el-date-editor .el-input__wrapper {
    width: 100%;
}

.activity-registration-form .el-form-item__error {
    padding-top: 0.25rem;
    font-size: 0.8125rem;
}

@media (max-width: 767.98px) {
    .activity-list-inner {
        padding: 2rem 0.75rem 2.5rem;
    }

    .activity-list-title {
        margin-bottom: 1.25rem;
        font-size: 1.375rem;
    }

    .activity-list-body {
        padding: 1rem 1.125rem 1.25rem;
    }

    .activity-list-item-title {
        font-size: 1rem;
    }

    .activity-detail {
        padding-top: 1rem;
    }

    .activity-detail-inner {
        padding: 0 0.75rem 2.5rem;
    }

    .activity-detail-layout {
        grid-template-columns: 1fr;
    }

    .activity-detail-main-body {
        padding: 1.25rem 1.125rem 1.5rem;
    }

    .activity-detail-title {
        font-size: 1.375rem;
    }

    .activity-detail-sidebar-card {
        position: static;
        padding: 1.25rem 1.125rem;
    }

    .activity-detail-cover,
    .activity-detail-cover img {
        max-height: 220px;
    }

    .activity-register-btn.el-button {
        height: 2.875rem;
        font-size: 0.9375rem;
    }

    .activity-registration-dialog-header {
        padding: 1.25rem 1.25rem 1rem;
        gap: 0.875rem;
    }

    .activity-registration-dialog-header-icon {
        width: 2.625rem;
        height: 2.625rem;
        border-radius: 10px;
    }

    .activity-registration-dialog-title {
        font-size: 1.125rem;
    }

    .activity-registration-dialog-subtitle {
        font-size: 0.875rem;
    }

    .activity-registration-dialog-content {
        padding: 0 1.125rem 0.25rem;
    }

    .activity-registration-dialog .el-dialog__footer {
        padding: 1rem 1.125rem 1.25rem;
    }

    .activity-registration-section {
        padding: 1rem 0.875rem 0.125rem;
    }

    .activity-registration-dialog-footer {
        display: grid;
        grid-template-columns: 1fr 1fr;
        width: 100%;
    }

    .activity-registration-btn-cancel.el-button,
    .activity-registration-btn-reset.el-button,
    .activity-registration-btn-submit.el-button {
        width: 100%;
        min-width: 0;
        margin-left: 0;
    }

    .activity-registration-btn-submit.el-button {
        grid-column: 1 / -1;
    }
}