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

.hidden {
    display: none !important;
}

/* :focus-visible targets keyboard-only focus with a visible ring */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.exposure-info-box {
    margin-top: 10px;
    padding: 8px;
    background: #f9f9f9;
    border-left: 4px solid #3498db;
    font-size: 0.9em;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    padding: 24px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 30px;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-logo {
    height: 5rem;
    width: auto;
    object-fit: contain;
    flex-shrink: 0;
}

.header-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    line-height: 1.2;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.4;
}

/* Main navigation — shared by index, fine-tune and uhpc pages.
   Pill-shaped tab strip with a clean active state; no JS, each page
   marks its own item with class="active". */
.main-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
    width: fit-content;
    max-width: 100%;
    margin: -10px auto 30px;
    padding: 5px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    backdrop-filter: blur(8px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    padding: 8px 18px;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 500;
    line-height: 1.2;
    white-space: nowrap;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.main-nav a:hover {
    color: var(--text-primary);
    background: rgba(37, 99, 235, 0.08);
}

.main-nav a.active {
    background: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 1px 6px rgba(37, 99, 235, 0.25);
}

.main-nav a.active:hover {
    background: var(--primary-dark);
    color: #ffffff;
}

@media (max-width: 520px) {
    .main-nav {
        width: 100%;
        border-radius: 12px;
    }
    .main-nav a {
        flex: 1;
        justify-content: center;
        padding: 8px 12px;
        font-size: 0.85rem;
    }
}

/* Calculator Section */
#calculator {
    background: rgba(255, 255, 255, 0.85);
    border-radius: 20px;
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.14), 0 6px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(14px);
    padding: 28px;
}

.form-section h2, .result-section h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group select,
.form-group input[type="number"],
.form-group input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group select:focus,
.form-group input[type="number"]:focus,
.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Follow-up hint links shown at the bottom of main. */
.followup-hints {
    margin: 24px 0 0;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.followup-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.followup-hint a {
    color: var(--primary-color);
    text-decoration: none;
}

.followup-hint a:hover {
    text-decoration: underline;
}

/* Results Section */
.result-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

/* Recipe Table */
.recipe-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 25px;
}

.recipe-table th,
.recipe-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.recipe-table th {
    background-color: #f1f5f9;
    font-weight: 600;
    color: var(--text-primary);
}

.recipe-table tr:hover {
    background-color: #f8fafc;
}

/* Instructions */
.instructions {
    background: #f8fafc;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.instructions h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.instructions ol {
    padding-left: 25px;
}

.instructions li {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    border-top: 2px solid var(--border-color);
    margin-top: 40px;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 1.4rem;
    }

    .tagline {
        font-size: 0.9rem;
    }

    .header-logo {
        height: 4rem;
    }

    #calculator {
        padding: 20px;
    }

    .form-section h2,
    .result-section h2 {
        font-size: 1.1rem;
    }

    .recipe-table {
        font-size: 0.9rem;
    }

    .recipe-table th,
    .recipe-table td {
        padding: 8px 10px;
    }

    .summary-item {
        padding: 12px 15px;
    }

    .summary-item .value {
        font-size: 1.2rem;
    }
}

/* Print Styles */
@media print {
    .main-nav,
    .btn {
        display: none !important;
    }
    body {
        background: white;
        color: #000 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    .container {
        max-width: 100%;
        padding: 0;
    }
    #calculator,
    header,
    footer {
        box-shadow: none !important;
        border: none !important;
        backdrop-filter: none !important;
        background: transparent !important;
    }
    .form-section {
        page-break-inside: avoid;
    }
    .result-section,
    .recipe-table,
    .instructions {
        page-break-inside: avoid;
    }
    .calc-details {
        all: initial;
        display: block;
        page-break-inside: avoid;
    }
    .calc-details summary {
        display: none;
    }
    /* Show link URLs for print */
    a[href]::after {
        content: " (" attr(href) ")";
        font-size: .8em;
        color: #333;
    }
    /* Ensure all text is visible */
    * {
        color: inherit !important;
        background-color: transparent !important;
        box-shadow: none !important;
    }
}

/* Loading State */
.btn.loading {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Error Message */
.error-message {
    background: #fef2f2;
    border-left: 4px solid var(--danger-color);
    color: var(--danger-color);
    padding: 12px 15px;
    border-radius: 8px;
    margin-top: 15px;
}

/* Success Message */
.success-message {
    background: #f0fdf4;
    border-left: 4px solid var(--success-color);
    color: var(--success-color);
    padding: 12px 15px;
    border-radius: 8px;
    margin-top: 15px;
}

/* Checkbox styling */
.form-group label input[type="checkbox"] {
    cursor: pointer;
}

/* Enhanced Checkbox Grid for Better Alignment */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px 16px;
    margin-top: 10px;
    align-items: start;
}

.checkbox-grid label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    width: 100%;
    padding: 8px 12px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.2s ease;
}

.checkbox-grid label:hover {
    background-color: rgba(255, 255, 255, 0.7);
    transform: translateY(-1px);
}

.checkbox-grid label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Ensure proper horizontal alignment of grid items */
.checkbox-grid > * {
    width: 100%;
    box-sizing: border-box;
}

/* Form hint text below inputs */
.form-hint {
    display: block;
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ── Moisture grid for grain group inputs ────────────────────────────────── */
.moisture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
    margin-top: 8px;
}

.moisture-grid > div label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.moisture-grid > div input {
    width: 100%;
}

/* ── Collapsible calculation steps ───────────────────────────────────────── */
.calc-details {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 20px;
}

.calc-details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
    user-select: none;
}

.calc-details summary:hover { color: var(--primary-dark); }

.calc-steps-table {
    width: 100%;
    margin-top: 12px;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.calc-steps-table td {
    padding: 5px 8px;
    vertical-align: top;
    border-bottom: 1px solid var(--border-color);
}

.calc-steps-table .step-num {
    width: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
}

.calc-steps-table .step-label {
    width: 220px;
    font-weight: 600;
    color: var(--text-primary);
}

.calc-steps-table .step-value { color: var(--text-secondary); }

/* ── Korngruppen table ───────────────────────────────────────────────────── */
#kornGruppenSection { margin-top: 20px; }

.korngruppen-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.korngruppen-table th,
.korngruppen-table td {
    border: 1px solid var(--border-color);
    padding: 7px 10px;
    text-align: right;
}

.korngruppen-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
    text-align: center;
}

.korngruppen-table td:first-child { text-align: left; font-weight: 600; }

.korngruppen-table .total-row td {
    background: #f1f5f9;
    border-top: 2px solid var(--primary-color);
}

.zugabewasser-info {
    background: #eff6ff;
    border-left: 4px solid var(--primary-color);
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-top: 8px;
}

.plausibility-warning {
    background: #fffbeb;
    border-left: 4px solid var(--warning-color);
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 0.9rem;
    color: #92400e;
    line-height: 1.7;
    margin-top: 8px;
    margin-bottom: 16px;
}

/* 4-column recipe table: right-align quantity cols */
.recipe-table {
    table-layout: auto;
}
.recipe-table td {
    word-break: break-word;
    overflow-wrap: anywhere;
}
.recipe-table th:nth-child(2),
.recipe-table td:nth-child(2),
.recipe-table th:nth-child(3),
.recipe-table td:nth-child(3) {
    text-align: right;
}
@media (min-width: 901px) {
    .recipe-table th:nth-child(2),
    .recipe-table td:nth-child(2),
    .recipe-table th:nth-child(3),
    .recipe-table td:nth-child(3) {
        white-space: nowrap;
    }
}

@media (max-width: 900px) {
    .recipe-table th,
    .recipe-table td {
        padding: 8px 6px;
    }
}

@media (max-width: 600px) {
    .calc-steps-table .step-label { width: 120px; }
    .moisture-grid { grid-template-columns: 1fr 1fr; }
    .korngruppen-table { font-size: 0.8rem; }
}

#langSwitcher select {
    font-size: 0.8rem;
    padding: 2px 6px;
    margin-left: 6px;
    border: 1px solid #e2e8f0;
    border-radius: 999px;
    background: rgba(255,255,255,0.7);
    color: var(--text-secondary);
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    line-height: 1.2;
}