:root {
    --primary-color: #4285f4;
    --primary-dark: #3367d6;
    --secondary-color: #f4b400;
    --background-color: #f8f9fa;
    --text-color: #202124;
    --light-text: #5f6368;
    --border-color: #dadce0;
    --success-color: #0f9d58;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); 
    --item-background: white;
    --button-hover-bg: #e8f0fe; 
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #4285f4;
        --primary-dark: #5c9aff;
        --secondary-color: #f4b400;
        --background-color: #1a1a1a; 
        --text-color: #e0e0e0;
        --light-text: #a7a7a7;
        --border-color: #3c4043;
        --success-color: #0f9d58;
        --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); 
        --item-background: #2a2a2a; 
        --button-hover-bg: #2d456e; 
    }
}

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

body {
    font-family: 'Roboto', sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, 
                 Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue'; 
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

main {
    flex: 1;
    padding: 1.5rem 1rem; 
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

h1 {
    font-size: 1.75rem; 
    font-weight: 500;
}

h2 {
    font-size: 1.3rem; 
    margin-bottom: 1.5rem; 
    font-weight: 500;
    color: var(--light-text);
    text-align: center; 
}

footer {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem;
    text-align: center;
    font-size: 0.85rem; 
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.home-logo-container {
    text-align: center;
    margin-bottom: 2rem;
}

.app-logo {
    width: 100px; 
    height: 100px;
    object-fit: contain;
}

.suppliers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); 
    gap: 1rem;
    margin-bottom: 2rem;
}

.supplier-button {
    background-color: var(--item-background);
    border: 1px solid var(--border-color);
    border-radius: 12px; 
    padding: 1.2rem 0.5rem; 
    text-align: center;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--card-shadow);
    height: 110px; 
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    font-size: 1.1rem; 
}

.supplier-button:hover, .supplier-button:focus {
    background-color: var(--button-hover-bg); 
    border-color: var(--primary-color);
    color: var(--primary-color); 
    outline: none;
    transform: translateY(-2px); 
}

.supplier-button:active {
    transform: scale(0.98) translateY(0);
}

.order-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem; 
}

#back-button {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.6rem; 
    margin-right: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
}

#back-button:hover {
    background-color: rgba(66, 133, 244, 0.1);
}

#back-button svg {
    color: var(--text-color); 
}

@media (prefers-color-scheme: dark) {
    #back-button svg {
        color: var(--text-color); 
    }
}

.order-items {
    margin-bottom: 2rem;
}

.item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.85rem 1rem; 
    border-bottom: 1px solid var(--border-color);
    background-color: var(--item-background);
    margin-bottom: 0.75rem; 
    border-radius: 8px; 
    box-shadow: var(--card-shadow);
}

.item-name {
    flex: 1;
    font-weight: 400;
    font-size: 1.05rem;
}

.item-counter {
    display: flex;
    align-items: center;
    gap: 0.25rem; 
}

.counter-button {
    width: 40px; 
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--item-background);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem; 
    font-weight: bold;
    color: var(--primary-color);
    transition: all 0.2s ease;
}

.counter-button:hover {
    background-color: var(--primary-color);
    color: white;
}

.counter-button:active {
    transform: scale(0.95);
}

.counter-button:disabled {
    color: var(--light-text);
    background-color: #e9ecef; 
    border-color: #e0e0e0;
    cursor: not-allowed;
    box-shadow: none;
}

@media (prefers-color-scheme: dark) {
    .counter-button:disabled {
        background-color: #3a3a3a;
        border-color: #4a4a4a;
    }
}

.counter-input {
    width: 3.5rem; 
    text-align: center;
    border: 1px solid var(--border-color);
    background-color: var(--item-background);
    color: var(--text-color);
    border-radius: 6px; 
    padding: 0.5rem 0.25rem; 
    font-size: 1.1rem; 
    font-weight: 500;
    -moz-appearance: textfield; 
}

/* Hide arrows for Chrome, Safari, Edge */
.counter-input::-webkit-outer-spin-button,
.counter-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.actions {
    position: sticky;
    bottom: 0; 
    left: 0;
    right: 0;
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem; 
    gap: 1rem; 
    border-top: 1px solid var(--border-color); 
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05); 
    z-index: 10; 
}

@media (prefers-color-scheme: dark) {
    .actions {
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
    }
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 0.6rem; 
    font-size: 1rem; 
    color: var(--light-text);
}

.checkbox-container input[type="checkbox"] {
    width: 20px; 
    height: 20px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-container label {
    cursor: pointer;
}

.primary-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px; 
    padding: 0.9rem 1.8rem; 
    font-weight: 500;
    font-size: 1.1rem; 
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); 
    width: 100%;
    max-width: 320px; 
}

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

.primary-button:active {
    transform: scale(0.98);
}

.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--success-color);
    color: white;
    padding: 0.9rem 1.8rem; 
    border-radius: 8px; 
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2); 
    transition: bottom 0.3s ease-in-out;
    z-index: 1000;
    font-size: 1rem;
    text-align: center;
    min-width: 200px;
}

.toast.show {
    bottom: 20px;
}

/* For offline notification */
.offline-indicator {
    position: sticky; 
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--secondary-color);
    color: black;
    text-align: center;
    padding: 0.5rem;
    font-weight: 500;
    z-index: 1000;
    display: none;
}

.offline-indicator.show {
    display: block;
}

/* Warning message for file:// protocol */
.protocol-warning-message {
    display: none; /* Hidden by default, shown by JS if protocol is file:// */
    background-color: #ffeb3b; /* Amber warning color */
    color: #333;
    padding: 1rem;
    text-align: center;
    font-size: 0.95rem;
    border-bottom: 1px solid #fbc02d;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 1rem; /* Add some space below it */
}

.protocol-warning-message p {
    margin-bottom: 0.5rem;
}

.protocol-warning-message p:last-child {
    margin-bottom: 0;
    font-size: 0.85rem;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .suppliers-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); 
    }
    
    .supplier-button {
        height: 90px;
        font-size: 1rem;
    }

    .item {
        padding: 0.75rem;
    }

    .counter-button {
        width: 36px;
        height: 36px;
        font-size: 1.2rem;
    }

    .counter-input {
        width: 3rem;
        font-size: 1rem;
    }

    .primary-button {
        padding: 0.8rem 1.2rem;
        font-size: 1rem;
    }
}