/* =====================================================================
   Snelstal Ammonia Emission Model — Stylesheet
   Visual style inspired by the original emissie.exe GTK interface,
   modernized with clean typography and subtle card-based sections.
   ===================================================================== */

:root {
    --color-bg: #f5f5f0;
    --color-card: #ffffff;
    --color-border: #c8c8c0;
    --color-border-section: #8a9a6e;
    --color-text: #2c2c2c;
    --color-text-muted: #666;
    --color-label: #333;
    --color-accent: #4a6b2a;
    --color-accent-hover: #5d8436;
    --color-header-bg: #e8ede0;
    --color-input-bg: #fff;
    --color-input-border: #b0b0a8;
    --color-input-focus: #6b8f3f;
    --color-result-bg: #f0f4e8;
    --color-result-border: #a8b890;
    --color-footer: #888;
    --font-main: "Segoe UI", system-ui, -apple-system, sans-serif;
    --font-mono: "Consolas", "SF Mono", "Monaco", monospace;
    --max-width: 640px;
    --radius: 6px;
}

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

html {
    font-size: 15px;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

/* Layout */
.app-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
}

.app-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: -0.02em;
}

.app-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.15rem;
}

/* Language toggle */
.lang-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
    color: var(--color-accent);
    cursor: pointer;
    transition: background-color 0.15s;
}

.lang-toggle:hover {
    background: var(--color-header-bg);
}

/* Section cards */
.section {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.section-header {
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.02em;
}

.section-body {
    padding: 0.75rem 1rem;
}

/* Form rows */
.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.3rem 0;
    gap: 0.75rem;
}

.form-row label {
    flex: 1;
    font-size: 0.88rem;
    color: var(--color-label);
    white-space: nowrap;
}

.form-row input[type="number"] {
    width: 120px;
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--color-input-border);
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    text-align: right;
    background: var(--color-input-bg);
    color: var(--color-text);
    transition: border-color 0.15s;
}

.form-row input[type="number"]:focus {
    outline: none;
    border-color: var(--color-input-focus);
    box-shadow: 0 0 0 2px rgba(107, 143, 63, 0.15);
}

/* Pit mode radio buttons */
.pit-mode-row {
    display: flex;
    gap: 1.5rem;
    padding: 0.5rem 0;
    margin-bottom: 0.25rem;
}

.pit-mode-row label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-accent);
    cursor: pointer;
}

.pit-mode-row input[type="radio"] {
    accent-color: var(--color-accent);
}

.pit-specific-fields {
    transition: opacity 0.2s;
}

.pit-specific-fields.disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* Calculate button */
.calculate-row {
    text-align: center;
    margin: 1.25rem 0;
}

.btn-calculate {
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    padding: 0.65rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s;
    letter-spacing: 0.02em;
}

.btn-calculate:hover {
    background: var(--color-accent-hover);
}

.btn-calculate:disabled {
    background: #999;
    cursor: not-allowed;
}

/* Results table */
.results-section {
    background: var(--color-card);
    border: 1px solid var(--color-result-border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
    display: none;
}

.results-section.visible {
    display: block;
}

.results-header {
    background: var(--color-result-bg);
    border-bottom: 1px solid var(--color-result-border);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.results-table th {
    text-align: right;
    padding: 0.5rem 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-result-bg);
}

.results-table th:first-child {
    text-align: left;
    width: 80px;
}

.results-table td {
    text-align: right;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-mono);
    border-bottom: 1px solid #eee;
}

.results-table td:first-child {
    text-align: left;
    font-family: var(--font-main);
    font-weight: 500;
}

.results-table tr:last-child td {
    border-bottom: none;
    font-weight: 700;
}

.results-note {
    padding: 0.5rem 1rem;
    font-size: 0.78rem;
    color: var(--color-text-muted);
    font-style: italic;
    text-align: center;
    border-top: 1px solid #eee;
}

/* Footer */
.app-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.78rem;
    color: var(--color-footer);
    line-height: 1.6;
}

.app-footer em {
    font-style: italic;
}

/* Responsive */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .app-container {
        padding: 1rem 0.75rem 2rem;
    }

    .form-row input[type="number"] {
        width: 100px;
    }
}