/* --- Core Variables & Base Styles --- */
:root {
    --primary-color: #007bff;
    --primary-color-dark: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --light-gray: #f8f9fa;
    --border-color: #dee2e6;
    --card-bg-color: #ffffff;
    --text-color: #212529;
    --label-color: #495057;
    --body-bg-color: #f4f7f6;
    --slider-track-bg: #e9ecef;
}

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: 16px; /* Increased rounding */
    padding: 2rem;
    box-shadow: 0 8px 16px rgba(0,0,0,0.05); /* Softer shadow */
    margin-bottom: 2rem;
}

/* --- Header --- */
.page-header { text-align: center; margin-bottom: 2.5rem; }
.page-header h1 { font-size: 2.5rem; font-weight: 700; color: var(--primary-color); margin-bottom: 0.5rem; }
.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; }

/* --- Layout --- */
.main-container { display: flex; flex-wrap: wrap; gap: 2.5rem; }
.calculator-column, .content-column { flex: 1; min-width: 320px; }

/* --- Form Styles --- */
.form-group { margin-bottom: 1.75rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-color); }

/* Customer Type Selector */
.customer-type-selector { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; }
.type-btn {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px; /* Increased rounding */
    padding: 0.75rem;
    font-weight: 600;
    color: var(--label-color);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.type-btn:hover { border-color: var(--primary-color); color: var(--primary-color); box-shadow: 0 4px 12px rgba(0,123,255,0.1); }
.type-btn.active { background-color: var(--primary-color); color: #fff; border-color: var(--primary-color); box-shadow: 0 6px 15px rgba(0,123,255,0.25); transform: translateY(-2px); }
.type-btn .icon-general { color: var(--primary-color); }
.type-btn .icon-senior { color: var(--success-color); }
.type-btn .icon-super-senior { color: var(--danger-color); }
.type-btn.active i { color: #fff; }

/* Input with Stepper */
.label-row { display: flex; justify-content: space-between; align-items: baseline; }
.amount-in-words { font-size: 0.9rem; font-weight: 600; color: var(--primary-color); }
.input-stepper { display: flex; align-items: center; border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; }
.input-stepper:focus-within { border-color: var(--primary-color); box-shadow: 0 0 0 4px rgba(0, 123, 255, 0.1); }
.input-stepper input { flex-grow: 1; border: none; outline: none; padding: 12px; text-align: center; font-size: 1.1rem; font-weight: 600; width: 100%; -moz-appearance: textfield; }
.input-stepper input::-webkit-outer-spin-button, .input-stepper input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input-stepper .icon { padding: 0 10px; font-weight: 600; color: var(--label-color); }
.stepper-btn { background-color: var(--light-gray); border: none; color: var(--text-color); font-size: 1.5rem; padding: 0 15px; cursor: pointer; align-self: stretch; }
.stepper-btn:hover { background-color: #e2e6ea; }

/* Slider */
.slider { -webkit-appearance: none; width: 100%; height: 8px; background: var(--slider-track-bg); border-radius: 5px; outline: none; margin-top: 1rem; transition: opacity .2s; }
.slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 22px; height: 22px; background: var(--primary-color); cursor: pointer; border-radius: 50%; box-shadow: 0 0 5px rgba(0,0,0,0.2); }
.slider::-moz-range-thumb { width: 22px; height: 22px; background: var(--primary-color); cursor: pointer; border-radius: 50%; border: none; box-shadow: 0 0 5px rgba(0,0,0,0.2); }
.slider:disabled { opacity: 0.5; }
.slider:disabled::-webkit-slider-thumb { background: var(--secondary-color); }

/* Other form elements */
.static-value { background-color: var(--light-gray); padding: 0.75rem 1rem; border-radius: 12px; font-weight: 600; }
.form-control { width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: 12px; font-size: 1rem; }
.custom-rate-group { display: flex; align-items: center; gap: 0.5rem; background-color: var(--light-gray); padding: 0.5rem 1rem; border-radius: 12px; margin-top: -1rem; }
.custom-rate-group label { margin-bottom: 0; }

/* Buttons */
.form-actions { display: flex; gap: 1rem; margin-top: 2rem; }
.btn { padding: 0.85rem 1.75rem; border-radius: 12px; border: 1px solid transparent; font-weight: 600; cursor: pointer; transition: all 0.3s; }
.btn-primary { background-color: var(--primary-color); color: #fff; }
.btn-primary:hover { background-color: var(--primary-color-dark); box-shadow: 0 6px 15px rgba(0,123,255,0.25); transform: translateY(-2px); }
.btn-secondary { background-color: #e2e6ea; color: var(--text-color); }
.btn-secondary:hover { background-color: #d2d6da; }

/* --- Results, Info & FAQ Sections --- */
.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: 8px; cursor: pointer; }
.btn-edit:hover { background-color: var(--light-gray); }
.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: 12px; }
.result-item.highlight-profit { background-color: #eaf6ec; border: 1px solid var(--success-color); }
.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); }

.formula-box { margin-top: 1rem; padding: 1.5rem; background-color: var(--light-gray); border-left: 5px solid var(--primary-color); border-radius: 12px; font-family: monospace; }
.faq-item { background-color: transparent; border: 1px solid var(--border-color); border-radius: 16px; margin-bottom: 1rem; transition: background-color 0.3s; overflow: hidden; }
.faq-item[open] { background-color: #fff; box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
.faq-item summary { font-weight: 600; padding: 1rem 1.25rem; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    font-family: "Font Awesome 6 Free";
    content: "\f078";
    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 --- */
.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: 8px; border-bottom-left-radius: 8px; }
.section-lang-switcher .lang-btn:last-child { border-top-right-radius: 8px; border-bottom-right-radius: 8px; border-left: none; }
.card > .section-lang-switcher { margin-top: -1rem; }
.floating-lang-switcher { position: fixed; bottom: 20px; right: 20px; z-index: 1000; display: flex; box-shadow: 0 4px 15px rgba(0,0,0,0.15); border-radius: 12px; overflow: hidden; }
.floating-lang-switcher .lang-btn { background-color: var(--card-bg-color); border: 1px solid var(--border-color); color: var(--label-color); padding: 0.5rem 1rem; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: all 0.3s; }
.floating-lang-switcher .lang-btn:last-child { 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); }

/* --- Result Tabs & Chart --- */
.results-tabs { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); margin-bottom: 1.5rem; flex-wrap: wrap; }
.tab-btn { background: none; border: none; padding: 0.75rem 1rem; 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; } }
.chart-container { max-width: 350px; min-height: 350px; margin: 1rem auto; position: relative; }

/* --- Responsive --- */
@media (min-width: 992px) { .calculator-column { position: sticky; top: 2rem; align-self: flex-start; } }
@media (max-width: 768px) { .container { padding: 0; } .card { border-radius: 0; border-left: none; border-right: none; } .page-header h1 { font-size: 2rem; } }