/* Modern CSS for Digitaler Verwendungsnachweis Atemschutz */
:root {
    --primary: #d62828;
    --primary-hover: #b71c1c;
    --primary-light: #ffebeb;
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --border-focus: #d62828;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.12);
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    padding: 16px 12px;
    min-height: 100vh;
}

.app-container {
    max-width: 650px;
    margin: 0 auto;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--card-bg);
    padding: 18px 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    position: relative;
    border-left: 5px solid var(--primary);
}

.header-icon {
    background: var(--primary-light);
    color: var(--primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.app-header h1 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-main);
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.admin-link-btn {
    margin-left: auto;
    background: #f1f5f9;
    color: var(--text-muted);
    padding: 10px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.2s ease;
}

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

/* Form Card */
.form-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 500px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.required {
    color: var(--primary);
}

input[type="text"],
input[type="date"],
textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: #fafafa;
    color: var(--text-main);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    font-family: inherit;
}

input[type="text"]:focus,
input[type="date"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(214, 40, 40, 0.15);
    background-color: #ffffff;
}

/* Checkbox Cards Grid */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 10px;
    margin-top: 4px;
}

.checkbox-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: #fafafa;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.checkbox-card:hover {
    border-color: var(--primary);
    background: #fff;
}

.checkbox-card input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
    background: #fff;
}

.checkbox-card input[type="checkbox"]:checked + .checkbox-custom {
    background-color: var(--primary);
    border-color: var(--primary);
}

.checkbox-card input[type="checkbox"]:checked + .checkbox-custom::after {
    content: "";
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-top: -2px;
}

.checkbox-card input[type="checkbox"]:checked ~ .checkbox-label {
    color: var(--primary);
    font-weight: 600;
}

.warning-card {
    grid-column: 1 / -1;
}

.warning-card input[type="checkbox"]:checked ~ .checkbox-label {
    color: #c2410c;
}

.warning-card input[type="checkbox"]:checked + .checkbox-custom {
    background-color: #ea580c;
    border-color: #ea580c;
}

/* Signature Field */
.signature-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 4px;
}

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

.signature-wrapper {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: #fff;
    height: 150px;
    touch-action: none;
}

.signature-wrapper canvas {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-md);
    cursor: crosshair;
}

.signature-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-muted);
    font-size: 0.85rem;
    pointer-events: none;
    opacity: 0.6;
}

/* Buttons */
.form-actions {
    margin-top: 10px;
}

.btn-primary {
    width: 100%;
    padding: 14px 20px;
    background-color: var(--primary);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 4px 12px rgba(214, 40, 40, 0.3);
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(214, 40, 40, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    padding: 12px 18px;
    background-color: #f1f5f9;
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-backdrop.hidden {
    display: none;
}

.modal-content {
    background: #ffffff;
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    max-width: 440px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modalPop {
    from { transform: scale(0.85); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.success-icon {
    width: 72px;
    height: 72px;
    background: #dcfce7;
    color: #16a34a;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.modal-content h2 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.modal-content p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Footer */
.app-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Print Only Styling - Exact visual replica of paper slip */
.print-only {
    display: none;
}

@media print {
    body * {
        visibility: hidden;
    }
    .print-only, .print-only * {
        visibility: visible;
    }
    .print-only {
        display: block !important;
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        padding: 20px;
        background: #ffffff;
        color: #000000;
        font-family: Arial, sans-serif;
    }
    
    .paper-slip {
        border: 2px solid #000;
        padding: 24px;
        max-width: 600px;
        margin: 0 auto;
        box-sizing: border-box;
    }

    .paper-slip-header {
        display: flex;
        justify-content: space-between;
        align-items: baseline;
        border-bottom: 2px solid #000;
        padding-bottom: 8px;
        margin-bottom: 16px;
    }

    .paper-slip-header h2 {
        font-size: 20pt;
        font-weight: bold;
        text-transform: uppercase;
        margin: 0;
    }

    .paper-line {
        margin-bottom: 12px;
        font-size: 11pt;
        line-height: 1.8;
    }

    .paper-line-flex {
        display: flex;
        justify-content: space-between;
        gap: 20px;
    }

    .underlined-value {
        border-bottom: 1px solid #000;
        display: inline-block;
        min-width: 150px;
        padding-left: 4px;
        font-weight: bold;
    }

    .paper-checkboxes {
        margin: 16px 0;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px 20px;
        font-size: 11pt;
    }

    .paper-checkbox-item {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .box-mark {
        display: inline-block;
        width: 14px;
        height: 14px;
        border: 1.5px solid #000;
        border-radius: 50%;
        text-align: center;
        line-height: 12px;
        font-size: 10pt;
        font-weight: bold;
    }

    .paper-remark-box {
        margin-top: 16px;
    }

    .paper-remark-content {
        border-bottom: 1px solid #000;
        min-height: 40px;
        margin-top: 6px;
        font-style: italic;
    }

    .paper-signature-box {
        margin-top: 30px;
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
    }

    .paper-signature-img {
        max-height: 50px;
        border-bottom: 1px solid #000;
        min-width: 200px;
    }
}