:root {
    --primary-dark: #0B3C33;
    --primary-light: #4DC1A1;
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-color: #333333;
    --font-family: 'Courier New', Courier, monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.6;
}

.container {
    max-width: 850px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background-color: var(--primary-dark);
    color: #ffffff;
    text-align: center;
    padding: 25px 20px;
    border-bottom: 4px solid var(--primary-light);
}

.header .logo {
    font-size: 2.2rem;
    letter-spacing: 1px;
}

.header .logo span {
    color: var(--primary-light);
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: 10px;
    margin: 20px 0 10px 0;
    border-bottom: 2px solid var(--primary-dark);
}

.tab-btn {
    background: #e0e0e0;
    border: none;
    padding: 12px 24px;
    font-family: inherit;
    font-weight: bold;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    color: var(--primary-dark);
    transition: all 0.2s ease;
}

.tab-btn.active {
    background: var(--primary-dark);
    color: #ffffff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.card {
    background: var(--card-bg);
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.04);
}

.card h2 {
    color: var(--primary-dark);
    margin-bottom: 10px;
    border-bottom: 2px solid var(--primary-light);
    display: inline-block;
}

.upload-zone {
    margin: 15px 0;
    padding: 25px;
    border: 2px dashed var(--primary-light);
    text-align: center;
    background: #f9fffb;
    border-radius: 6px;
    position: relative;
    cursor: pointer;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin: 15px 0;
}

input[type="number"], select {
    padding: 8px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
}

.btn {
    background-color: var(--primary-dark);
    color: #ffffff;
    border: none;
    padding: 10px 18px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
    border-radius: 4px;
    text-decoration: none;
    display: inline-block;
    transition: background 0.2s ease;
}

.btn:hover {
    background-color: var(--primary-light);
    color: var(--primary-dark);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.download-btn {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    margin-top: 10px;
}

.result-area {
    margin-top: 15px;
    padding: 15px;
    background: #eef9f5;
    border-left: 4px solid var(--primary-dark);
}

/* PDF Viewer Specific Styles */
.viewer-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    background: var(--primary-dark);
    color: #ffffff;
    padding: 10px 15px;
    border-radius: 6px 6px 0 0;
    gap: 10px;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.pdf-viewer-box {
    border: 2px solid var(--primary-dark);
    background: #e0e0e0;
    padding: 15px;
    text-align: center;
    max-height: 600px;
    overflow: auto;
    border-radius: 0 0 6px 6px;
}

.pdf-viewer-box.dark-mode {
    background: #1e1e1e;
    filter: invert(0.9) hue-rotate(180deg);
}

#pdfCanvas {
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    max-width: 100%;
}

.crop-box {
    max-width: 100%;
    margin: 15px 0;
    background: #333;
}

.crop-box img {
    max-width: 100%;
    display: block;
}

.hidden {
    display: none !important;
}

.promo-banner {
    background: var(--primary-dark);
    color: #ffffff;
    padding: 25px;
    text-align: center;
    border-radius: 8px;
    margin-top: 20px;
}

.promo-banner h3 {
    color: var(--primary-light);
    margin-bottom: 10px;
}

.btn-whatsapp {
    background-color: #25D366;
    color: white;
    margin-top: 15px;
}

.footer {
    text-align: center;
    padding: 20px;
    font-size: 0.85rem;
    color: #666;
}