:root {
    /* Color Palette from shopping_list */
    --primary-color: #316745;
    --primary-hover: #397750;
    --secondary-color: #64748b;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding: var(--spacing-lg) var(--spacing-md);
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

.d-none {
    display: none !important;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: #007b43;
    font-family: 'Playfair Display', serif;
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    font-size: 0.875rem;
    text-decoration: none;
}

.btn-submit {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-submit:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--background-color);
}

.btn-logout {
    background-color: var(--background-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: var(--danger-hover);
}

.btn-cancel {
    background-color: var(--background-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

/* Auth Cards */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
}

.auth-card {
    background-color: var(--card-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 420px;
    text-align: center;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
}

.tabs {
    display: flex;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.input-group {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.input-group input[type="email"],
.input-group input[type="password"],
.input-group input[type="text"] {
    width: 100%;
    padding: 0.75rem var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.input-group input:focus {
    border-color: var(--primary-color);
}

.divider {
    display: flex;
    align-items: center;
    margin: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.divider::before,
.divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.divider span {
    padding: 0 var(--spacing-sm);
}

.btn-google {
    width: 100%;
    background-color: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-weight: 500;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-google img {
    height: 18px;
    width: 18px;
}

.btn-google:hover {
    background-color: var(--background-color);
}

.error-message {
    color: var(--danger-color);
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-top: var(--spacing-md);
}

/* List Management Bar */
.list-management-card {
    background-color: var(--card-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.list-select-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.list-select-wrapper label {
    font-weight: 600;
    font-size: 0.95rem;
}

.custom-select {
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    background-color: white;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    min-width: 180px;
}

.list-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Collapsible Input Form */
.input-card {
    background-color: var(--card-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    max-height: 400px;
    transition: max-height 0.3s ease, padding 0.3s ease, margin 0.3s ease, opacity 0.3s ease;
}

.input-card.collapsed {
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-bottom: 0;
    border: none;
    opacity: 0;
}

.input-card textarea {
    width: 100%;
    padding: 0.75rem var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    resize: none;
    margin-bottom: var(--spacing-md);
    transition: border-color 0.2s;
}

.input-card textarea:focus {
    border-color: var(--primary-color);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
}

.form-actions input[type="submit"] {
    padding: 0.625rem 1.5rem;
    font-size: 0.95rem;
    cursor: pointer;
    font-family: inherit;
    border-radius: var(--radius-md);
    border: none;
}

.loading-message {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Toggle Control */
.toggle-control {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    cursor: pointer;
}

.toggle-state {
    display: flex;
    justify-content: center;
    width: 100%;
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--card-background);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all 0.2s;
}

.toggle-label:hover {
    color: var(--primary-color);
    transform: translateY(1px);
    box-shadow: none;
}

/* Category Grid & Cards */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.category-card {
    background-color: var(--card-background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    height: fit-content;
}

.category-header {
    background-color: #f8fafc;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    cursor: grab;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.category-header:active {
    cursor: grabbing;
}

.category-header p {
    font-size: 1rem;
    color: var(--text-primary);
}

/* Sortable styling */
.sortable-ghost {
    opacity: 0.4;
    border: 2px dashed var(--primary-color);
}

.sortable-fallback {
    opacity: 0.9;
}

/* Items List */
.item-list {
    min-height: 50px;
    padding: var(--spacing-sm);
}

.item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    background-color: #fafbfc;
    border: 1px solid transparent;
    transition: all 0.2s;
}

.item:hover {
    background-color: #f1f5f9;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
    cursor: pointer;
}

.checkbox-wrapper input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-color);
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-wrapper label {
    font-size: 0.95rem;
    cursor: pointer;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.checkbox-wrapper input[type="checkbox"]:checked + label {
    text-decoration: line-through;
    color: var(--text-secondary);
}

/* Item quantity badge */
.item-quantity {
    background-color: #e2e8f0;
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.15rem 0.4rem;
    border-radius: 9999px;
    margin-left: var(--spacing-sm);
    font-weight: 500;
}

/* Delete item form / button */
.delete-form {
    display: flex;
    align-items: center;
}

.btn-delete {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-delete:hover {
    color: var(--danger-color);
    background-color: #fee2e2;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--card-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 500px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* Share modal details */
.share-input-row {
    display: flex;
    gap: var(--spacing-sm);
}

.share-input-row input {
    flex: 1;
}

.shared-users-container {
    margin-top: var(--spacing-lg);
}

.shared-users-container h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

#shared-users-list {
    list-style: none;
}

#shared-users-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.btn-remove-share {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-weight: bold;
    font-size: 1.1rem;
    padding: 0 var(--spacing-sm);
}

/* Footer Actions */
.footer-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* Classifying badge / spinner */
.classifying-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    color: #4b5563;
    background-color: #f3f4f6;
    padding: 0.15rem 0.4rem;
    border-radius: var(--radius-sm);
    margin-left: var(--spacing-sm);
}

.spinner {
    width: 10px;
    height: 10px;
    border: 2px solid #9ca3af;
    border-top: 2px solid #4b5563;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 600px) {
    .list-management-card {
        flex-direction: column;
        align-items: stretch;
    }
    
    .list-actions {
        justify-content: space-between;
    }
}