/* CampusNotesHub Theme */
:root {
    --primary-color: #4f46e5;
    --secondary-color: #7c3aed;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --dark-bg: #1e293b;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo h2 {
    color: var(--primary-color);
    font-weight: 700;
}

.logo i {
    color: var(--success-color);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
}

/* Cards */
.card {
    border: none;
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    border: none;
}

.card-header h5 {
    font-weight: 600;
}

.card-body {
    padding: 30px;
}

/* Drop Zone */
.drop-zone {
    border: 3px dashed var(--border-color);
    border-radius: 16px;
    padding: 60px 30px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--light-bg);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.05);
    transform: scale(1.02);
}

.drop-zone i {
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.drop-zone:hover i {
    transform: scale(1.1);
}

/* File Info */
.file-info {
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Watermark Options */
.watermark-option {
    border: 3px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--light-bg);
    text-align: center;
}

.watermark-option:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.2);
}

.watermark-option.active {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.3);
}

.watermark-preview {
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 8px;
    margin-bottom: 15px;
    position: relative;
    overflow: hidden;
}

.watermark-text {
    font-size: 18px;
    font-weight: 700;
    color: rgba(0, 0, 0, 0.3);
    transform: rotate(-45deg);
    white-space: nowrap;
}

.watermark-label {
    font-weight: 600;
    color: var(--text-primary);
}

.watermark-option.active .watermark-label i {
    color: var(--success-color);
}

/* Progress Bar */
.progress {
    background: var(--light-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    font-weight: 700;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#progressStatus {
    color: var(--primary-color);
    font-size: 18px;
}

/* Form Controls */
.form-select,
.form-control {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-select:focus,
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-range {
    height: 8px;
}

.form-range::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.form-range::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.form-range::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.form-check-input:checked {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

/* Buttons */
.btn {
    border-radius: 10px;
    font-weight: 600;
    padding: 12px 24px;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.3);
}

.btn-success:disabled {
    background: #94a3b8;
    cursor: not-allowed;
    transform: none;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    margin-top: 50px;
}

.footer a {
    color: var(--primary-color);
    font-weight: 600;
}

.footer a:hover {
    color: var(--secondary-color);
}

/* Badges */
.badge {
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.badge.bg-success i {
    animation: pulse 2s infinite;
}

/* Responsive */
@media (max-width: 768px) {
    .card-body {
        padding: 20px;
    }

    .drop-zone {
        padding: 40px 20px;
    }

    .watermark-option {
        margin-bottom: 15px;
    }

    .btn-lg {
        padding: 12px 30px;
        font-size: 16px;
    }
}

/* Alert Styles */
.alert {
    border-radius: 12px;
    border: none;
}

.alert-info {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
}

/* Loading Animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.spinner {
    animation: spin 1s linear infinite;
}