:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: rgba(37, 99, 235, 0.08);
    --primary-ring: rgba(37, 99, 235, 0.2);
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --info: #3b82f6;
    --info-bg: #eff6ff;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.06), 0 4px 6px rgba(0,0,0,0.04);
    --radius: 10px;
    --radius-lg: 14px;
    --radius-pill: 50px;
    --transition: 0.2s ease;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-hover); }

/* ========== NAVBAR ========== */
.app-container { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }

.app-navbar {
    background: var(--card-bg);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}

.brand-icon { font-size: 22px; }

.brand-text {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: all var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-link.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
}

.nav-user {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 0 8px;
    white-space: nowrap;
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 22px;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: background var(--transition);
}

.navbar-toggle:hover { background: var(--border-light); }

.mobile-menu {
    display: none;
    background: var(--card-bg);
    padding: 8px 16px 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.mobile-menu.show { display: flex; flex-direction: column; gap: 2px; }

.mobile-nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    transition: all var(--transition);
}

.mobile-nav-link:hover, .mobile-nav-link:active {
    color: var(--primary);
    background: var(--primary-light);
}

.mobile-user-info {
    color: var(--text-muted);
    font-size: 13px;
    padding: 10px 14px 4px;
    border-top: 1px solid var(--border-light);
    margin-top: 4px;
}

/* ========== MAIN CONTENT ========== */
.app-main {
    flex: 1;
    padding: 24px 20px;
    max-width: 760px;
    margin: 0 auto;
    width: 100%;
}

/* ========== CARD / FORM CONTAINER ========== */
.form-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
}

.form-title {
    font-size: 20px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 28px;
    color: var(--text);
    letter-spacing: -0.02em;
}

/* ========== FORM ELEMENTS ========== */
.form-group { margin-bottom: 22px; }

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text);
}

.required { color: var(--danger); margin-right: 2px; }

.form-control, .form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text);
    background: var(--card-bg);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px var(--primary-ring);
}

.form-control::placeholder { color: var(--text-muted); }

select.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

textarea.form-control { resize: vertical; min-height: 80px; }

.form-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 6px;
}

.form-hint a { color: var(--primary); }

/* ========== RADIO & CHECKBOX GROUPS ========== */
.radio-group, .checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.radio-item, .checkbox-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
}

.radio-item:hover, .checkbox-item:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.radio-item:has(input:checked), .checkbox-item:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}

.radio-item input, .checkbox-item input {
    accent-color: var(--primary);
    margin: 0;
}

/* ========== LOCATION ========== */
.location-selectors {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
}

.location-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
    padding: 6px 0;
    color: var(--primary);
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: opacity var(--transition);
}

.location-btn:hover { opacity: 0.8; }
.location-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.location-msg {
    font-size: 13px;
    margin-top: 4px;
    color: var(--success);
}

/* ========== UPLOAD ========== */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--border-light);
}

.upload-area:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-area-btn {
    display: block;
    width: 100%;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--border-light);
    font: inherit;
    color: inherit;
}

.upload-area-btn:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-hint { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.upload-icon { font-size: 32px; opacity: 0.7; }
.upload-text { font-size: 14px; color: var(--text-secondary); }

.image-preview-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}

.image-preview-item {
    position: relative;
    width: 90px;
    height: 90px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.image-preview-item.large { width: 130px; height: 130px; }

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-btn {
    position: absolute;
    top: 3px;
    right: 3px;
    background: rgba(0,0,0,0.55);
    color: white;
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.remove-btn:hover { background: rgba(0,0,0,0.8); }

/* ========== BUTTONS ========== */
.btn-submit {
    width: 100%;
    padding: 13px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    margin-top: 8px;
    box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.btn-submit:hover { background: var(--primary-hover); box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3); }
.btn-submit:disabled { opacity: 0.55; cursor: not-allowed; box-shadow: none; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--border);
}
.btn-outline:hover { border-color: var(--primary); background: var(--primary-light); }

.btn-danger-outline {
    background: transparent;
    color: var(--danger);
    border-color: var(--border);
}
.btn-danger-outline:hover { border-color: var(--danger); background: var(--danger-bg); }

.btn-success {
    background: var(--success);
    color: white;
    border-color: var(--success);
}
.btn-success:hover { background: #059669; }

.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

/* ========== ALERTS ========== */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-top: 16px;
    border: 1px solid;
}

.alert-success { background: var(--success-bg); color: #065f46; border-color: #a7f3d0; }
.alert-danger { background: var(--danger-bg); color: #991b1b; border-color: #fecaca; }
.alert-info { background: var(--info-bg); color: #1e40af; border-color: #bfdbfe; }

/* ========== LOGIN ========== */
.login-container {
    max-width: 400px;
    margin: 40px auto;
}

.login-brand {
    text-align: center;
    margin-bottom: 24px;
}

.login-brand-icon { font-size: 40px; display: block; margin-bottom: 8px; }
.login-brand-text { font-size: 14px; color: var(--text-muted); }

.login-hint {
    text-align: center;
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

/* ========== TASK LIST ========== */
.task-list { display: flex; flex-direction: column; gap: 10px; }

.task-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    cursor: pointer;
    transition: all var(--transition);
}

.task-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.task-id { font-weight: 700; color: var(--primary); font-size: 15px; }

.task-status {
    display: inline-block;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.status-pending { background: var(--warning-bg); color: #b45309; }
.status-assigned { background: var(--info-bg); color: #1d4ed8; }
.status-completed { background: var(--success-bg); color: #047857; }

.task-body { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
.task-body strong { color: var(--text); font-weight: 600; }

.urgency-紧急 { color: var(--danger); font-weight: 700; }
.urgency-高 { color: #ea580c; font-weight: 600; }
.urgency-中 { color: var(--warning); font-weight: 600; }
.urgency-低 { color: var(--success); font-weight: 500; }

/* ========== DETAIL GRID ========== */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 20px;
}

.detail-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light);
}

.detail-item.full { grid-column: 1 / -1; }

.detail-item label {
    font-size: 12px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-weight: 500;
}

.detail-item span { font-size: 15px; color: var(--text); }

/* ========== TABLE ========== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    text-align: left;
    padding: 10px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
    color: var(--text-secondary);
}

.data-table tbody tr {
    cursor: pointer;
    transition: background var(--transition);
}

.data-table tbody tr:hover { background: var(--border-light); }

.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 0 -4px;
    padding: 0 4px;
}

/* ========== FILTER BAR ========== */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.filter-bar .form-select { max-width: 200px; }

/* ========== SECTION CARD (for assign/complete areas) ========== */
.section-card {
    margin-top: 24px;
    padding: 20px;
    background: var(--border-light);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.section-card h5 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
}

.section-card p { font-size: 14px; color: var(--text-secondary); }

.assign-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.assign-row .form-select { flex: 1; }

/* ========== USER FORM CARD ========== */
.user-form-card {
    padding: 20px;
    background: var(--border-light);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.user-form-card h5 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 14px;
}

.user-form-row {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1.2fr auto;
    gap: 10px;
    align-items: end;
}

/* ========== BADGE ========== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
}

.badge-admin { background: var(--danger-bg); color: #b91c1c; }
.badge-tech { background: var(--info-bg); color: #1d4ed8; }

/* ========== BACK BUTTON ========== */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 20px;
    padding: 6px 0;
    transition: color var(--transition);
}

.back-link:hover { color: var(--primary); }

/* ========== EMPTY STATE ========== */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 15px;
}

/* ========== LOADING ========== */
.loading-state {
    text-align: center;
    padding: 30px;
    color: var(--text-muted);
    font-size: 14px;
}

/* ========== BLAZOR ERROR ========== */
.blazor-error-boundary {
    background: #b32121;
    padding: 1rem;
    color: white;
    border-radius: 8px;
}

/* ========== PHOTO MODAL ========== */
.photo-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.photo-modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 20px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.photo-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.photo-modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.photo-modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 6px;
    transition: background var(--transition);
}

.photo-modal-close:hover { background: var(--border-light); }

.photo-modal-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.photo-modal-grid img {
    max-width: 100%;
    border-radius: 8px;
    border: 1px solid var(--border);
    flex: 1 1 calc(50% - 10px);
    min-width: 200px;
}

.photo-thumbnail {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    object-fit: cover;
    cursor: pointer;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.photo-thumbnail:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .app-navbar { padding: 0 14px; height: 54px; }
    .brand-text { font-size: 14px; }
    .navbar-links { display: none; }
    .navbar-toggle { display: block; }

    .app-main { padding: 16px 12px; }

    .form-container { padding: 20px 16px; border-radius: var(--radius); }
    .form-title { font-size: 18px; margin-bottom: 22px; }

    .location-selectors { grid-template-columns: 1fr; }

    .radio-group, .checkbox-group { gap: 6px; }
    .radio-item, .checkbox-item { padding: 7px 14px; font-size: 13px; }

    .detail-grid { grid-template-columns: 1fr; gap: 0; }

    .image-preview-item { width: 76px; height: 76px; }
    .image-preview-item.large { width: 100px; height: 100px; }

    .login-container { margin: 20px auto; }

    /* Table -> Card list */
    .data-table thead { display: none; }
    .data-table, .data-table tbody, .data-table tr, .data-table td {
        display: block;
        width: 100%;
    }
    .data-table tr {
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: 8px;
        padding: 12px;
        margin-bottom: 10px;
    }
    .data-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 4px 0;
        border-bottom: 1px solid var(--border-light);
        font-size: 14px;
    }
    .data-table td:last-child { border-bottom: none; }
    .data-table td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: 12px;
        color: var(--text-muted);
        text-transform: uppercase;
        flex-shrink: 0;
        margin-right: 12px;
    }
    .data-table td:last-child {
        justify-content: flex-end;
        padding-top: 8px;
    }

    .filter-bar { flex-direction: column; align-items: stretch; }
    .filter-bar .form-select { max-width: 100%; }

    .user-form-row {
        grid-template-columns: 1fr;
    }

    .assign-row { flex-direction: column; align-items: stretch; }

    .task-body { font-size: 13px; }
}

@media (max-width: 480px) {
    .form-container { padding: 16px 14px; }
    .radio-group, .checkbox-group { flex-direction: column; }
    .radio-item, .checkbox-item { justify-content: flex-start; }
}