/* MARGINAL RELIEF CALCULATOR STYLESHEET */

/* --- Core Variables & Base Styles --- */
:root {
    --primary-color: #3498db;
    --secondary-color: #6c757d;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --light-gray: #f8f9fa;
    --border-color: #dee2e6;
    --card-bg-color: #ffffff;
    --text-color: #2c3e50;
    --label-color: #34495e;
    --body-bg-color: #f4f7f6;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--body-bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

/* --- Page Header --- */
.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}
.page-header { text-align: center; margin-bottom: 2.5rem; }
.page-header p { font-size: 1.1rem; color: var(--label-color); max-width: 700px; margin: 0 auto; }
.last-updated { font-size: 0.9rem; color: var(--label-color); margin-top: 0.5rem; font-style: italic; }

/* --- Main Layout --- */
.main-container { display: grid; grid-template-columns: 1fr 1.5fr; gap: 2.5rem; align-items: flex-start;}
.calculator-column { position: sticky; top: 2rem; }
.content-column { min-width: 0; } 

/* --- Calculator Form Styles --- */
.form-group { margin-bottom: 1.5rem; }
.form-label, label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-color); }
.input-wrapper { display: flex; align-items: center; border: 1px solid var(--border-color); border-radius: 8px; overflow: hidden; transition: border-color 0.3s, box-shadow 0.3s; }
.input-wrapper:focus-within { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15); }
.input-wrapper .icon { padding: 0 12px; background-color: var(--light-gray); align-self: stretch; display: flex; align-items: center; border-right: 1px solid var(--border-color); color: var(--label-color); }
.input-wrapper input, .input-wrapper select { flex: 1; border: none; outline: none; padding: 12px; width: 100%; background-color: var(--card-bg-color); color: var(--text-color); font-size: 1rem; }
.input-wrapper input[type="number"]::-webkit-outer-spin-button, .input-wrapper input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input-wrapper input[type="number"] { -moz-appearance: textfield; }

/* --- Buttons --- */
.form-actions { display: flex; gap: 1rem; margin-top: 2rem; }
.btn { padding: 0.75rem 1.5rem; border-radius: 8px; border: 1px solid transparent; font-weight: 600; cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; text-decoration: none; }
.btn-primary { background-color: var(--primary-color); color: #fff; }
.btn-primary:hover { background-color: #2980b9; transform: translateY(-2px); box-shadow: 0 4px 8px rgba(52, 152, 219, 0.2); }
.btn-secondary { background-color: var(--light-gray); color: var(--text-color); border-color: var(--border-color); }
.btn-secondary:hover { background-color: #e2e6ea; border-color: #dae0e5; }
.info-note.error-container { background-color: #ffefef; color: #d90429; margin-top: 1.5rem; padding: 1rem; font-weight: 600; border-radius: 8px;}

/* --- Results Section --- */
.results-card h2, .info-section h2 { font-size: 1.5rem; padding-bottom: 0.75rem; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; }
.info-section h2 .icon, .results-card h2 .icon { color: var(--primary-color); margin-right: 0.75rem; }
.edit-wrapper { display: flex; justify-content: space-between; align-items: center; }
.btn-edit { background: none; border: 1px solid var(--border-color); color: var(--primary-color); padding: 0.3rem 0.8rem; border-radius: 6px; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: background-color 0.3s, border-color 0.3s; white-space: nowrap; }
.btn-edit:hover { background-color: var(--light-gray); border-color: var(--primary-color); }
.btn-edit i { margin-right: 0.4rem; }
.results-tabs { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); margin-bottom: 1.5rem; }
.tab-btn { background: none; border: none; padding: 0.75rem 1.25rem; cursor: pointer; font-size: 1rem; font-weight: 600; color: var(--label-color); border-bottom: 3px solid transparent; margin-bottom: -1px; transition: color 0.3s, border-color 0.3s; }
.tab-btn.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.5s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; }
.result-item { background-color: var(--light-gray); padding: 1.25rem; border-radius: 8px; border-left: 4px solid transparent; }
.result-item.highlight-profit { background-color: #eaf6ec; border-color: var(--success-color); border-width: 1px 1px 1px 4px; border-style: solid; }
.result-item.highlight-profit .value { color: var(--success-color); font-size: 1.7rem; }
.result-item p { margin: 0 0 0.5rem 0; color: var(--label-color); font-weight: 600; }
.result-item .value { font-weight: 700; font-size: 1.5rem; word-break: break-all; color: var(--text-color); }
.result-item .value-block { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; margin-top: 0.25rem; }
.copy-btn { background: none; border: none; color: var(--label-color); cursor: pointer; font-size: 1rem; padding: 0.25rem; border-radius: 4px; transition: color 0.2s, background-color 0.2s; }
.copy-btn:hover { color: var(--primary-color); background-color: #e9ecef; }
.chart-container { width: 100%; min-height: 400px; position: relative; }
#results-chart { width: 100%; height: 100%; }

/* --- Info & FAQ Sections --- */
.faq-item { background-color: transparent; border: 1px solid var(--border-color); border-radius: 12px; margin-bottom: 1rem; transition: background-color 0.3s; overflow: hidden; }
.faq-item[open] { background-color: #fff; }
.faq-item summary { font-weight: 600; padding: 1rem 1.25rem; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; transition: background-color 0.2s ease-out; }
.faq-item summary:hover { background-color: var(--light-gray); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '\f078'; font-family: 'Font Awesome 6 Free'; font-weight: 900; transition: transform 0.3s ease-in-out; color: var(--primary-color); }
.faq-item[open] > summary { border-bottom: 1px solid var(--border-color); }
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-item div { padding: 1.25rem; line-height: 1.8; }

/* --- Language Switchers & Notifications --- */
.section-lang-switcher { display: flex; justify-content: flex-end; margin-bottom: 1rem; }
.section-lang-switcher .lang-btn { background-color: var(--light-gray); border: 1px solid var(--border-color); color: var(--label-color); padding: 0.2rem 0.6rem; font-size: 0.8rem; font-weight: 600; cursor: pointer; transition: all 0.3s; }
.section-lang-switcher .lang-btn:first-child { border-top-left-radius: 6px; border-bottom-left-radius: 6px; }
.section-lang-switcher .lang-btn:last-child { border-top-right-radius: 6px; border-bottom-right-radius: 6px; border-left: none; }
.section-lang-switcher .lang-btn.active, .floating-lang-switcher .lang-btn.active { background-color: var(--primary-color); color: #fff; border-color: var(--primary-color); }
.card > .section-lang-switcher { margin-top: -0.5rem; }

/* --- Full Width Content Section Styles --- */
.full-width-container { grid-column: 1 / -1; margin-top: 1rem;}
.card.info-card-full { width: 100%; }
.table-container { overflow-x: auto; border: 1px solid var(--border-color); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 15px; text-align: left; border-bottom: 1px solid var(--border-color); }
th { background-color: #f7f9fc; font-weight: 600; color: var(--primary-color); }
tr:last-child td { border-bottom: none; }
.scenario-box { background-color: #f0fdf4; border-left: 5px solid var(--success-color); padding: 1.5rem; border-radius: 8px; margin-top: 1rem; }
.scenario-box h3 { color: #155724; margin-top: 0; }
.scenario-box ul { list-style-position: inside; padding-left: 0; }
.tips-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-top: 1rem; }
.tip-card { background-color: #f8f9fa; padding: 1.5rem; border-radius: 12px; }
.tip-card h4 { color: var(--primary-color); margin-top: 0; margin-bottom: 0.5rem; }


/* --- Responsive Design --- */
@media (max-width: 992px) { 
    .main-container { grid-template-columns: 1fr; } 
    .calculator-column { position: static; } 
}
@media (max-width: 768px) { 
    .container { padding-left: 0; padding-right: 0; } 
    .card { border-radius: 0; border-left: none; border-right: none; box-shadow: 0 5px 15px rgba(0,0,0,0.02); padding: 1.5rem 1rem; } 
    .results-card { padding-left: 1rem; padding-right: 1rem; } 
    .result-item .value { font-size: 1.2rem; } 
    .page-header h1 { font-size: 2rem; } 
}