/* Custom properties for colors */
:root {
    --brave-pink: #F784C5;
    --hero-green: #1B602F;
    --dark-bg: #121212;
    --darker-bg: #0A0A0A;
    --light-text: #F0F0F0;
    --secondary-text: #A0A0A0;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 960px;
    margin: auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    background: rgba(18, 18, 18, 0.8);
    position: fixed;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: background 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--brave-pink);
    text-shadow: 0 0 10px var(--brave-pink);
}

nav ul {
    list-style: none;
    display: flex;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

nav ul li a:hover {
    color: var(--brave-pink);
    text-shadow: 0 0 5px var(--brave-pink);
}

/* Hero/Banner Slider */
.hero-slider {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background-color: var(--darker-bg);
}

.slider-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.slider-item.active {
    opacity: 1;
}

.slider-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: sepia(100%) hue-rotate(320deg) saturate(200%);
    opacity: 0.8;
}

/* Sections */
section {
    padding: 4rem 0;
}

.filter-section, .about-section {
    text-align: center;
    padding-top: 6rem;
}

.filter-section h2, .about-section h2 {
    font-size: 2.5rem;
    color: var(--brave-pink);
    margin-bottom: 0.5rem;
}

.filter-section p {
    font-size: 1.1rem;
    color: var(--secondary-text);
    margin-bottom: 2rem;
}

/* File Upload and Buttons */
.filter-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

#imageInput {
    display: none;
}

.custom-file-upload {
    background-color: var(--hero-green);
    color: var(--light-text);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
    border: 2px solid var(--hero-green);
}

.custom-file-upload:hover {
    background-color: #1a552e;
    transform: translateY(-2px);
}

.primary-btn {
    background-color: var(--brave-pink);
    color: var(--dark-bg);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.primary-btn:hover:not(:disabled) {
    background-color: #e675b6;
    transform: translateY(-2px);
}

.primary-btn:disabled {
    background-color: #333;
    color: #888;
    cursor: not-allowed;
}

/* Image Preview */
.image-preview-container {
    position: relative;
    width: 100%;
    max-width: 700px;
    height: 450px;
    margin: auto;
    background-color: var(--darker-bg);
    border: 2px dashed var(--secondary-text);
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    margin-bottom: 2rem;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    display: none;
}

/* Loading Animation */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(18, 18, 18, 0.9);
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--light-text);
    text-align: center;
    z-index: 50;
    transition: opacity 0.5s ease-in-out;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--brave-pink);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Download Button */
.download-container {
    text-align: center;
    margin-bottom: 2rem;
}

/* Footer */
footer {
    background: var(--darker-bg);
    color: var(--secondary-text);
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid #333;
}