:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #f3f4f6;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --success: #10b981;
    --error: #ef4444;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #f5f7fa; /* Fallback */
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-main);
    padding: 20px;
}

.main-wrapper {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: white;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    padding: 40px;
    transition: transform 0.3s ease;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.logo-area {
    width: 60px;
    height: 60px;
    background: #e0e7ff;
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-main);
}

header p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Upload Area */
.upload-container {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    background: #f9fafb;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.upload-container:hover, .upload-container.drag-active {
    border-color: var(--primary);
    background: #eef2ff;
}

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

.icon-cloud {
    color: #9ca3af;
    margin-bottom: 16px;
    transition: color 0.3s;
}

.upload-container:hover .icon-cloud {
    color: var(--primary);
}

.upload-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-main);
}

.upload-content p {
    font-size: 12px;
    color: var(--text-muted);
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: 40px 0;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e5e7eb;
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Results Section */
.preview-container {
    position: relative;
    margin-bottom: 30px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    background: #000;
}

.image-preview {
    width: 100%;
    display: block;
    max-height: 300px;
    object-fit: contain;
    background: #f3f4f6;
}

.preview-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.6);
    padding: 10px;
    display: flex;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.preview-container:hover .preview-overlay {
    opacity: 1;
}

.btn-reset {
    background: white;
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.section-title {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Data Cards */
.data-card {
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.data-card:hover {
    border-color: #d1d5db;
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.data-info {
    flex: 1;
    margin-right: 15px;
    overflow: hidden;
}

.data-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.data-value {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 15px;
    color: var(--text-main);
    word-break: break-all;
    font-weight: 500;
}

.copy-btn {
    background: white;
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
}

.copy-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.copy-btn.copied {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

/* Skeleton Loading */
.skeleton-loader {
    display: none; /* Controlled by JS */
}
.skeleton-line {
    height: 60px;
    background: #f3f4f6;
    margin-bottom: 12px;
    border-radius: 8px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

/* Accordion */
.accordion {
    margin-top: 20px;
    border-top: 1px solid var(--border);
}

.accordion-header {
    padding: 15px 0;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 14px;
}

.accordion-header:hover {
    color: var(--primary);
}

.raw-text {
    background: #1f2937;
    color: #e5e7eb;
    padding: 15px;
    border-radius: 8px;
    font-size: 12px;
    font-family: monospace;
    white-space: pre-wrap;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #374151;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 20px;
    color: #4b5563;
    font-size: 12px;
}

/* Alerts */
.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert.error {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
    .card {
        padding: 20px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .data-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .copy-btn {
        width: 100%;
        height: 32px;
    }
}