:root {
    --bg-dark: #0b0f19;
    --container-dark: #1e293b;
    --accent-blue: #0047ab;
    --success-green: #16a34a;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    margin-top: 10px;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    background: linear-gradient(135deg, var(--accent-blue), #3b82f6);
    width: 52px;
    height: 52px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(0, 71, 171, 0.5);
}

.logo-v {
    font-size: 32px;
    font-weight: 800;
    color: white;
    line-height: 1;
}

.brand-info h1 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.brand-info p {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 400;
}

/* Upload Zone */
.upload-zone {
    background-color: var(--container-dark);
    border: 2px dashed #334155;
    border-radius: var(--border-radius-lg);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent-blue);
    background-color: rgba(30, 41, 59, 0.9);
    transform: translateY(-2px);
}

.upload-icon {
    color: var(--accent-blue);
    margin-bottom: 8px;
}

.upload-text {
    font-size: 17px;
    font-weight: 500;
}

.upload-hint {
    font-size: 13px;
    color: var(--text-muted);
}

.hidden {
    display: none !important;
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.preview-section h2 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.preview-container {
    background-color: var(--container-dark);
    border-radius: var(--border-radius-lg);
    padding: 16px;
    max-height: 280px;
    overflow-y: auto;
    display: flex;
    justify-content: center;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.3);
}

.preview-container img {
    max-width: 100%;
    max-height: 240px;
    object-fit: contain;
    border-radius: 8px;
}

.preview-container pre {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    white-space: pre-wrap;
    word-break: break-word;
    color: #e2e8f0;
    width: 100%;
    line-height: 1.6;
}

/* Scrollbar for text preview */
.preview-container::-webkit-scrollbar {
    width: 6px;
}
.preview-container::-webkit-scrollbar-track {
    background: transparent;
}
.preview-container::-webkit-scrollbar-thumb {
    background-color: #475569;
    border-radius: 10px;
}

/* Settings */
.config-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.config-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.config-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
}

.config-group select {
    background-color: var(--container-dark);
    color: var(--text-main);
    border: 1px solid #334155;
    padding: 14px;
    border-radius: var(--border-radius-md);
    font-family: 'Outfit', sans-serif;
    font-size: 15px;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 18px;
    transition: all 0.2s;
    cursor: pointer;
}

.config-group select:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 2px rgba(0, 71, 171, 0.2);
}

/* Action Button */
.action-btn {
    background: var(--accent-blue);
    color: white;
    border: none;
    padding: 18px;
    border-radius: var(--border-radius-lg);
    font-family: 'Outfit', sans-serif;
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 71, 171, 0.4);
    margin-top: 10px;
}

.action-btn:hover:not(:disabled) {
    background: #005ce6;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 71, 171, 0.6);
}

.action-btn:active:not(:disabled) {
    transform: translateY(0);
}

.action-btn:disabled {
    background: var(--container-dark);
    color: #475569;
    cursor: not-allowed;
    box-shadow: none;
    opacity: 0.8;
}

.action-btn.success {
    background: var(--success-green);
    box-shadow: 0 4px 15px rgba(22, 163, 74, 0.4);
}