/* Enhanced UI for Film Grain Effect Generator */

/* Modern color scheme */
:root {
    --primary-color: #6200ea;
    --primary-light: #9d46ff;
    --primary-dark: #0a00b6;
    --secondary-color: #00bfa5;
    --text-color: #263238;
    --background-color: #f5f7fa;
    --card-color: #ffffff;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 0;
    margin: 0;
}

.container {
    max-width: 1000px;
    margin: 1rem auto;
    padding: 1.5rem;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.5px;
}

/* Stylish upload container */
.upload-container {
    background-color: var(--card-color);
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px var(--shadow-color);
}

.upload-container:hover {
    border-color: var(--primary-color);
    background-color: rgba(98, 0, 234, 0.02);
    transform: translateY(-3px);
}

.upload-container.drag-over {
    border-color: var(--secondary-color);
    background-color: rgba(0, 191, 165, 0.05);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-content img {
    width: 48px;
    height: 48px;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.upload-content p {
    font-size: 0.95rem;
    color: #666;
    max-width: 80%;
    margin: 0 auto;
}

/* Enhanced controls */
.controls {
    background-color: var(--card-color);
    padding: 1.25rem 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.25rem;
    box-shadow: 0 4px 16px var(--shadow-color);
}

label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-color);
}

input[type="range"] {
    flex: 1;
    height: 24px;
    -webkit-appearance: none;
    background: transparent;
    cursor: pointer;
    padding: 6px 0;
    min-width: 180px;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    transition: all 0.2s ease;
}

input[type="range"]::-moz-range-track {
    width: 100%;
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: -7px;
    box-shadow: 0 2px 6px rgba(98, 0, 234, 0.3);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    box-shadow: 0 2px 6px rgba(98, 0, 234, 0.3);
}

input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.1);
    box-shadow: 0 2px 12px rgba(98, 0, 234, 0.4);
}

input[type="range"]:hover::-moz-range-thumb {
    transform: scale(1.1);
    box-shadow: 0 2px 12px rgba(98, 0, 234, 0.4);
}

.download-type {
    padding: 0.6rem 0.9rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--card-color);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    min-width: 160px;
}

.download-type:hover {
    border-color: var(--primary-color);
}

.download-type:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(98, 0, 234, 0.2);
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 100px;
    font-weight: 500;
    letter-spacing: 0.3px;
    font-size: 0.9rem;
}

button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(98, 0, 234, 0.3);
}

button:disabled {
    background-color: #bdbdbd;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

button.loading {
    background-color: var(--primary-dark);
    cursor: wait;
}

/* Enhanced canvas container */
.canvas-container {
    position: relative;
    max-width: 100%;
    margin: 0 auto;
    padding: 2rem;
    display: none;
    justify-content: center;
    align-items: center;
}

.canvas-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    background-color: var(--card-color);
    transition: all 0.3s ease;
    display: inline-block;
    margin: 0 auto;
}

canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

#grainCanvas {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
}

/* Enhanced loading spinner */
.loading-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
    margin-left: 8px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive improvements */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

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

    .download-type, button {
        width: 100%;
    }

    h1 {
        font-size: 2rem;
    }
}

/* Modern footer */
.footer {
    text-align: center;
    margin-top: 3rem;
    padding: 1.5rem;
    color: #666;
    font-size: 0.9rem;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

/* Add subtle animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.canvas-wrapper {
    animation: fadeIn 0.4s ease-out;
}