:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --radius: 12px;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}
.print-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 440px;
    overflow: hidden;
}
.card-header {
    padding: 24px 24px 16px 24px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.card-header h1 {
    margin: 0 0 4px 0;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}
.card-header p {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted);
}
.tabs-nav {
    display: flex;
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
    padding: 6px;
    gap: 4px;
}
.tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: calc(var(--radius) - 4px);
    transition: all 0.2s ease;
}
.tab-btn.active {
    background: var(--card-bg);
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.card-body {
    padding: 24px;
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}
.input-wrapper {
    position: relative;
    margin-bottom: 20px;
}
.input-wrapper label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-muted);
}
textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    resize: none;
    outline: none;
    transition: border-color 0.2s;
    background: #f8fafc;
}
textarea:focus {
    border-color: var(--primary);
    background: var(--card-bg);
}
.counter-badge {
    text-align: right;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}
.hidden-input {
    display: none !important;
}
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    background: #f8fafc;
    transition: all 0.2s;
    margin-bottom: 20px;
}
.upload-zone:hover {
    border-color: var(--primary);
    background: #f0fdf4;
}
.upload-label {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.upload-icon {
    font-size: 28px;
}
.upload-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
}
.upload-hint {
    font-size: 12px;
    color: var(--text-muted);
}
.preview-container {
    text-align: center;
    margin-bottom: 20px;
    overflow-y: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: #000;
    display: none;
}
.preview-container img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}
.main-print-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}
.main-print-btn:hover {
    background: var(--primary-hover);
}
.main-print-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}