:root {
    --oily-green: #2d5016;
    --oily-golden: #b8860b;
    --dark-text: #1a1a1a;
    --light-bg: #f8f9fa;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: var(--dark-text);
    min-height: 100vh;
    padding: 2rem 0;
}

h1, h2, h3, h4, h5, h6, .brand-text {
    font-family: 'Poppins', sans-serif;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Section */
.header-section {
    text-align: center;
    margin-bottom: 3rem;
    background: white;
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

.logo-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 1.5rem;
}

.site-logo {
    height: 55px;
    width: auto;
    object-fit: contain;
}

.brand-text {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.1;
}

.brand-text .p1 {
    color: var(--oily-green);
}

.brand-text .p2 {
    color: var(--oily-golden);
}

.main-title {
    font-size: 3rem;
    font-weight: 900;
    color: var(--oily-green);
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
    font-weight: 500;
}

/* Upload Section */
.upload-section {
    margin-bottom: 3rem;
}

.upload-card {
    background: white;
    padding: 3rem 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    text-align: center;
    border: 3px solid rgba(184, 134, 11, 0.1);
}

.upload-icon {
    font-size: 4rem;
    color: var(--oily-golden);
    margin-bottom: 1.5rem;
}

.upload-card h3 {
    font-size: 1.8rem;
    color: var(--oily-green);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

/* File Input */
.file-input-wrapper {
    margin: 2rem 0;
}

.file-input-wrapper input[type="file"] {
    display: none;
}

.file-label {
    display: inline-block;
    padding: 1.2rem 2.5rem;
    background: var(--light-bg);
    border: 3px dashed var(--oily-golden);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: var(--oily-green);
    font-size: 1.1rem;
}

.file-label:hover {
    background: rgba(184, 134, 11, 0.1);
    border-color: var(--oily-green);
    transform: translateY(-2px);
}

.file-label i {
    margin-right: 10px;
    font-size: 1.3rem;
}

.file-name {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--oily-green);
    font-size: 1rem;
}

/* Watermark Preview */
.watermark-preview {
    background: rgba(184, 134, 11, 0.1);
    padding: 1rem 1.5rem;
    border-radius: 10px;
    margin: 1.5rem 0;
    border-left: 5px solid var(--oily-golden);
    display: inline-block;
}

.watermark-preview i {
    color: var(--oily-golden);
    margin-right: 10px;
}

.watermark-preview strong {
    color: var(--oily-green);
    font-size: 1.1rem;
}

/* Buttons */
.btn-process {
    background: linear-gradient(135deg, var(--oily-green) 0%, #1a300d 100%);
    color: white;
    border: none;
    padding: 1.2rem 3rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(45, 80, 22, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-top: 1rem;
}

.btn-process:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(45, 80, 22, 0.4);
}

.btn-process:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Progress Section */
.progress-section {
    margin-top: 2rem;
}

.progress-bar-container {
    width: 100%;
    height: 30px;
    background: var(--light-bg);
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 1rem;
    border: 2px solid rgba(184, 134, 11, 0.2);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--oily-golden) 0%, var(--oily-green) 100%);
    width: 0%;
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
}

.progress-text {
    color: var(--oily-green);
    font-weight: 600;
    font-size: 1.1rem;
}

/* Download Section */
.download-section {
    margin-top: 2rem;
}

.success-icon {
    font-size: 4rem;
    color: #28a745;
    margin-bottom: 1rem;
}

.download-section h4 {
    color: var(--oily-green);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--oily-golden);
    color: white;
    padding: 1.2rem 3rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(184, 134, 11, 0.3);
    margin-bottom: 1rem;
}

.btn-download:hover {
    background: #9a6f09;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(184, 134, 11, 0.4);
    color: white;
}

.btn-reset {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: white;
    color: var(--oily-green);
    border: 2px solid var(--oily-green);
    padding: 0.8rem 2rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.btn-reset:hover {
    background: var(--oily-green);
    color: white;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.06);
    text-align: center;
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.info-card i {
    font-size: 2.5rem;
    color: var(--oily-golden);
    margin-bottom: 1rem;
}

.info-card h5 {
    color: var(--oily-green);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.info-card p {
    color: #666;
    font-size: 0.9rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: #666;
}

.footer-line {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--oily-golden) 50%, transparent 100%);
    margin: 1rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    .main-title {
        font-size: 2rem;
    }
    
    .brand-text {
        font-size: 1.8rem;
    }
    
    .upload-card {
        padding: 2rem 1.5rem;
    }
    
    .btn-process, .btn-download {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}


/* Opacity Control Slider */
.opacity-control {
    margin: 25px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid var(--oily-golden);
}

.opacity-control label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--oily-green);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.opacity-control label i {
    color: var(--oily-golden);
}

.opacity-control #opacityValue {
    color: var(--oily-golden);
    font-size: 1.1rem;
}

.opacity-control input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: linear-gradient(to right, #e9ecef 0%, var(--oily-golden) 50%, #2d5016 100%);
    outline: none;
    -webkit-appearance: none;
    margin: 10px 0;
}

.opacity-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--oily-golden);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(184, 134, 11, 0.4);
    transition: all 0.3s ease;
}

.opacity-control input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(184, 134, 11, 0.6);
}

.opacity-control input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--oily-golden);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(184, 134, 11, 0.4);
    transition: all 0.3s ease;
}

.opacity-control input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(184, 134, 11, 0.6);
}

.opacity-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: #666;
    margin-top: 5px;
}