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

:root {
    --primary: #06b6d4;
    --secondary: #3b82f6;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --dark: #1a1a2e;
    --darker: #0f0f1e;
    --text: #eee;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--darker);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    padding: 60px 20px 40px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.logo h1 {
    font-size: 4rem;
    font-weight: 900;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1.2rem;
    color: var(--text);
    max-width: 700px;
    margin: 0 auto;
}

.upload-box {
    background: rgba(255,255,255,0.05);
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 40px;
    margin: 40px 0;
}

.upload-box h3, .upload-box h4 {
    color: #fff;
    margin-bottom: 25px;
}

.dropzone {
    border: 3px dashed rgba(255,255,255,0.2);
    border-radius: 15px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: rgba(255,255,255,0.05);
}

.dropzone:hover {
    border-color: var(--primary);
    background: rgba(6, 182, 212, 0.1);
}

.dropzone svg {
    color: var(--primary);
    margin-bottom: 20px;
}

.dropzone p {
    color: var(--text);
    font-size: 1.1rem;
    margin: 10px 0;
}

.format-hint {
    font-size: 0.9rem !important;
    color: rgba(255,255,255,0.5) !important;
}

#preview {
    margin-top: 30px;
}

#previewImages {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.preview-item {
    text-align: center;
}

.preview-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 10px;
    border: 2px solid rgba(255,255,255,0.2);
}

.preview-item p {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text);
    word-break: break-all;
}

.watermark-options {
    margin-top: 40px;
    padding-top: 40px;
    border-top: 2px solid rgba(255,255,255,0.1);
}

.option-group {
    margin-bottom: 25px;
}

.option-group label {
    display: block;
    margin-bottom: 10px;
    color: #fff;
    font-weight: 600;
}

.radio-group {
    display: flex;
    gap: 30px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    cursor: pointer;
}

.radio-label input {
    width: auto;
    cursor: pointer;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: #fff;
    font-weight: 600;
}

input[type="text"],
input[type="file"],
select {
    width: 100%;
    padding: 15px;
    background: rgba(0,0,0,0.5);
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    color: #fff;
    font-size: 1rem;
}

input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

input[type="range"] {
    width: calc(100% - 60px);
    margin-right: 10px;
}

input[type="color"] {
    width: 80px;
    height: 50px;
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    cursor: pointer;
}

.btn-process {
    width: 100%;
    padding: 20px;
    background: var(--gradient);
    border: none;
    border-radius: 15px;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
    transition: all 0.3s;
}

.btn-process:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.5);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 60px 0;
}

.feature {
    text-align: center;
    padding: 30px;
    background: rgba(255,255,255,0.03);
    border-radius: 15px;
    border: 1px solid rgba(255,255,255,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #fff;
}

.feature p {
    color: var(--text);
}

.footer {
    margin-top: 80px;
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.result-box {
    background: rgba(0,255,136,0.1);
    border: 2px solid rgba(0,255,136,0.3);
    border-radius: 15px;
    padding: 30px;
    margin: 30px 0;
}

.result-box h3 {
    color: #00ff88;
    margin-bottom: 20px;
}

.result-images {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.result-item {
    text-align: center;
    background: rgba(0,0,0,0.3);
    padding: 15px;
    border-radius: 10px;
}

.result-item img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 15px;
}

.btn-download {
    display: inline-block;
    padding: 10px 20px;
    background: #00ff88;
    color: #000;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,255,136,0.5);
}

@media (max-width: 768px) {
    .logo h1 {
        font-size: 2.5rem;
    }
    
    .dropzone {
        padding: 40px 20px;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 15px;
    }
}