/* pH Indicator Page Styles */

.back-button {
    position: fixed;
    top: 2rem;
    left: 2rem;
    z-index: 999;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent-color);
    color: var(--dark-bg);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
    .back-button {
        top: 1rem;
        left: 1rem;
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
}

.ph-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 2rem;
    padding-top: 5rem;
    text-align: center;
}

.ph-section h1 {
    font-size: clamp(2rem, 6vw, 3rem);
    color: var(--accent-color);
    margin-top: 2rem;
    margin-bottom: 2rem;
    z-index: 1;
    position: relative;
}

.input-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

.input-box {
    width: 80px;
    padding: 12px;
    border: 2px solid var(--accent-color);
    border-radius: 8px;
    font-size: 16px;
    text-align: center;
    background: var(--dark-secondary);
    color: var(--dark-text);
    transition: all 0.3s ease;
}

.input-box:focus {
    outline: none;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    transform: scale(1.05);
}

.button-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    margin: 1.5rem 0;
}

button, .hero-button, .upload-label {
    padding: 12px 24px;
    background: var(--accent-color);
    color: var(--dark-bg);
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-width: 200px;
}

button:hover, .hero-button:hover, .upload-label:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.outline-button {
    background: transparent !important;
    color: var(--accent-color) !important;
    border: 2px solid var(--accent-color) !important;
}

.outline-button:hover {
    background: var(--accent-color) !important;
    color: var(--dark-bg) !important;
}

#result {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
    color: var(--accent-color);
    padding: 1rem;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.1);
    max-width: 90%;
    word-wrap: break-word;
}

/* Hide default file input */
#imageUpload {
    display: none;
}

/* Image preview container */
.image-preview-container {
    margin: 1.5rem 0;
    border: 2px solid var(--accent-color);
    border-radius: 12px;
    padding: 15px;
    background: var(--dark-secondary);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    position: relative;
    max-width: 90vw;
}

.canvas-container {
    position: relative;
    display: inline-block;
}

.image-preview-container canvas {
    max-width: 100%;
    border-radius: 8px;
    cursor: crosshair;
    display: block;
    margin: 0 auto;
}

.color-circle {
    position: absolute;
    width: 30px;
    height: 30px;
    border: 3px solid var(--accent-color);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.1);
    animation: pulse 2s infinite;
    display: none;
}

@keyframes pulse {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.7; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

.mobile-helper {
    display: none;
    background: rgba(0, 0, 0, 0.04);
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-top: 1rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* Mobile Styles */
@media (max-width: 768px) {
    .ph-section {
        padding: 1rem;
        padding-top: 5rem;
    }
    
    .ph-section h1 {
        margin-top: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .input-container {
        gap: 0.8rem;
    }
    
    .input-box {
        width: 90px;
        padding: 14px;
        font-size: 18px;
    }
    
    .button-container {
        width: 100%;
    }
    
    button, .hero-button, .upload-label {
        width: 100%;
        max-width: 300px;
        padding: 15px 24px;
        font-size: 18px;
    }
    
    .mobile-helper {
        display: block;
    }
    
    .image-preview-container {
        margin: 1rem 0;
        padding: 10px;
    }
    
    .color-circle {
        width: 40px;
        height: 40px;
        border-width: 4px;
    }
    
    #result {
        font-size: 16px;
        margin: 1.5rem 0;
    }
}

@media (max-width: 480px) {
    .ph-section h1 {
        font-size: 2rem;
    }
    
    .input-box {
        width: 85px;
        padding: 12px;
        font-size: 16px;
    }
    
    .image-preview-container {
        padding: 8px;
    }
}