:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --background: #ffffff;
    --surface: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --want-color: #3b82f6;
    --need-color: #dc2626;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    /* Prevent mobile touch issues */
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Allow text selection for inputs and content */
input, textarea, [contenteditable] {
    -webkit-user-select: text;
    -khtml-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
}

.login-box {
    background: var(--background);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    border-radius: 1rem;
}

.login-box h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.tagline {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    text-align: left;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="url"],
select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    /* Prevent mobile double-tap and zoom */
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Disabled button state for form submissions */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

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

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.error-message {
    background-color: #fee;
    color: var(--danger-color);
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.app-header h1 {
    font-size: 1.5rem;
}

.app-main {
    flex: 1;
    padding: 1rem;
    padding-bottom: 80px;
    overflow-y: auto;
}

.add-item-container {
    margin-bottom: 1.5rem;
}

.plus-icon {
    font-size: 1.25rem;
    font-weight: bold;
}

.items-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.item-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.item-card:active {
    transform: scale(0.98);
}

.item-number {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--text-secondary);
    min-width: 30px;
    text-align: center;
}

.item-content {
    flex: 1;
}

.item-name {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.item-details {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.item-cost {
    font-weight: 600;
    color: var(--success-color);
}

.item-type {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.item-type.want {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--want-color);
}

.item-type.need {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--need-color);
}

.item-added-by {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
}

.item-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.875rem;
}

.item-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 0.5rem;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
}

.btn-icon:hover:not(:disabled) {
    background-color: var(--surface);
}

.btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon.btn-edit {
    color: var(--primary-color);
}

.btn-icon.btn-complete {
    color: var(--success-color);
}

.btn-icon.btn-delete {
    color: var(--danger-color);
}

.btn-icon.btn-restore {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-icon.btn-restore:hover:not(:disabled) {
    background-color: rgba(37, 99, 235, 0.1);
}

.app-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    justify-content: space-around;
    gap: 0.5rem;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    padding: 1rem;
    overflow-y: auto;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content h2 {
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    justify-content: flex-end;
}

.archive-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 60vh;
    overflow-y: auto;
}

.archive-item {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
}

.archive-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.archive-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.archive-item h4 {
    font-size: 1rem;
}

.archive-reason {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.archive-reason.completed {
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--success-color);
}

.archive-reason.deleted {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.archive-item-details {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.archive-date {
    margin-left: auto;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 3rem 1rem;
}

.empty-state h3 {
    font-size: 1.25rem;
    margin: 1rem 0 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 1rem;
    margin: 0;
}

.empty-icon, .error-icon {
    width: 80px;
    height: 80px;
    opacity: 0.6;
    margin-bottom: 1rem;
}

.loading {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

.connection-status {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: white;
    font-weight: 500;
    z-index: 9999;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.connection-status.success {
    background-color: var(--success-color);
}

.connection-status.warning {
    background-color: #f59e0b;
}

.connection-status.error {
    background-color: var(--danger-color);
}

.error-message {
    text-align: center;
    color: var(--danger-color);
    padding: 2rem;
    background-color: rgba(239, 68, 68, 0.1);
    border-radius: 0.5rem;
    margin: 1rem;
}

.error-message h3 {
    font-size: 1.25rem;
    margin: 1rem 0 0.5rem;
    color: var(--danger-color);
}

.error-message p {
    font-size: 1rem;
    margin: 0.5rem 0 1rem;
    color: var(--text-secondary);
}

.error-message .btn {
    margin-top: 0.5rem;
}

@media (max-width: 640px) {
    .app-footer {
        flex-wrap: wrap;
    }
    
    .btn-small {
        flex: 1;
        min-width: calc(50% - 0.25rem);
    }
    
    .item-actions {
        flex-direction: column;
    }
    
    .btn-icon {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}