/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #263548;
    --bg-input: #0f172a;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --border: #334155;
    --success: #10b981;
    --warning: #f59e0b;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
    --radius: 12px;
    --radius-sm: 8px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

a { color: var(--primary-light); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* === Navbar === */
.navbar {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: .5rem; text-decoration: none; color: var(--text); }
.logo-icon { font-size: 1.5rem; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo-text { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.5px; }
.logo-accent { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo-sub { font-size: .75rem; color: var(--text-muted); font-weight: 400; border-left: 1px solid var(--border); padding-left: .5rem; margin-left: .25rem; }

.nav-links { display: flex; list-style: none; gap: .25rem; align-items: center; }
.nav-links a {
    color: var(--text-muted);
    padding: .5rem .75rem;
    border-radius: var(--radius-sm);
    font-size: .875rem;
    font-weight: 500;
    transition: all .2s;
}
.nav-links a:hover { color: var(--text); background: var(--bg-card); }

.btn { display: inline-flex; align-items: center; justify-content: center; font-weight: 600; border: none; cursor: pointer; transition: all .2s; text-decoration: none; }
.btn-nav {
    background: var(--gradient);
    color: #fff !important;
    padding: .5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: .8rem;
}
.btn-nav:hover { opacity: .9; transform: translateY(-1px); }

.btn-primary {
    background: var(--gradient);
    color: #fff;
    padding: .875rem 2rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
}
.btn-primary:hover { opacity: .9; transform: translateY(-1px); box-shadow: 0 4px 20px rgba(37,99,235,.4); }
.btn-lg { padding: 1rem 2rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* === Hero === */
.hero {
    padding: 4rem 0 3rem;
    text-align: center;
    background: radial-gradient(ellipse at 50% 0%, rgba(37,99,235,.15) 0%, transparent 60%);
}
.hero-sm { padding: 3rem 0 2rem; }
.hero h1 { font-size: 2.5rem; font-weight: 800; letter-spacing: -1px; margin-bottom: .75rem; }
.hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.section-tag {
    display: inline-block;
    background: rgba(37,99,235,.15);
    color: var(--primary-light);
    padding: .25rem .75rem;
    border-radius: 20px;
    font-size: .8rem;
    font-weight: 600;
    margin-bottom: .75rem;
    letter-spacing: .5px;
    text-transform: uppercase;
}

/* === Calculator Grid (Homepage) === */
.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    padding: 2rem 0 3rem;
}

.calc-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all .3s;
    position: relative;
    overflow: hidden;
}
.calc-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient);
    transform: scaleX(0);
    transition: transform .3s;
}
.calc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.calc-card:hover::before { transform: scaleX(1); }

.calc-icon { font-size: 2.5rem; margin-bottom: 1rem; display: block; }
.calc-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: .5rem; }
.calc-card p { color: var(--text-muted); font-size: .9rem; margin-bottom: 1.25rem; line-height: 1.5; }

.btn-card {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    color: var(--primary-light);
    font-weight: 600;
    font-size: .9rem;
    transition: all .2s;
}
.btn-card:hover { color: var(--accent); gap: .6rem; }

/* === Section === */
.section { padding: 2.5rem 0; }
.info-section { padding: 2rem 0 3rem; }

/* === Calculator Layout === */
.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.calculator-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    position: sticky;
    top: 5rem;
}
.calculator-form h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 1.5rem; }

.calculator-results h2 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .5px;
    font-size: .85rem;
}
.mt-2 { margin-top: 2rem; }

/* === Form === */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-size: .85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: .4rem;
}
.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: .75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color .2s, box-shadow .2s;
    -moz-appearance: textfield;
}
.form-group input[type="number"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.2);
}
.form-group input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

.form-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    margin-right: .5rem;
    vertical-align: middle;
}
.form-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text);
    font-size: .9rem;
}

/* === Range Slider === */
.slider-wrap { margin-top: .4rem; }

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    outline: none;
    transition: background .2s;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--gradient);
    border: 2px solid var(--bg);
    box-shadow: 0 2px 8px rgba(37,99,235,.4);
    cursor: pointer;
    transition: transform .15s, box-shadow .15s;
}
input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 12px rgba(37,99,235,.6);
}
input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid var(--bg);
    box-shadow: 0 2px 8px rgba(37,99,235,.4);
    cursor: pointer;
}
input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
    background: var(--border);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: .7rem;
    color: var(--text-dim);
    margin-top: .2rem;
}

/* === Results === */
.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .875rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: .5rem;
    transition: background .2s;
}
.result-card:hover { background: var(--bg-card-hover); }

.result-label { font-size: .875rem; color: var(--text-muted); }
.result-value { font-size: 1rem; font-weight: 700; font-variant-numeric: tabular-nums; }

.result-highlight {
    background: linear-gradient(135deg, rgba(37,99,235,.12) 0%, rgba(6,182,212,.08) 100%);
    border-color: var(--primary);
}
.result-highlight .result-value {
    font-size: 1.3rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.result-employer {
    background: linear-gradient(135deg, rgba(245,158,11,.08) 0%, rgba(239,68,68,.06) 100%);
    border-color: var(--warning);
}
.result-employer .result-value { color: var(--warning); font-size: 1.15rem; }

/* === Info cards === */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.info-intro { color: var(--text-muted); max-width: 800px; margin-bottom: 1.5rem; line-height: 1.7; }

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}
.info-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .75rem; color: var(--primary-light); }
.info-card ul { list-style: none; }
.info-card li {
    padding: .3rem 0;
    font-size: .9rem;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(51,65,85,.5);
}
.info-card li:last-child { border-bottom: none; }
.info-card li strong { color: var(--text); }
.info-card p { font-size: .9rem; color: var(--text-muted); }
.info-card p strong { color: var(--text); }

/* === Rates Table === */
.rates-table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
.rates-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
}
.rates-table th {
    background: var(--bg-card);
    color: var(--text-muted);
    font-weight: 600;
    text-align: left;
    padding: .875rem 1rem;
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    border-bottom: 1px solid var(--border);
}
.rates-table td {
    padding: .75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}
.rates-table tr:last-child td { border-bottom: none; }
.rates-table tr:hover td { background: var(--bg-card-hover); }
.rates-table td strong { color: var(--primary-light); }

/* === Homepage wide card === */
.calc-card-wide { grid-column: 1 / -1; }

/* === Compare Layout === */
.compare-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 2rem;
    align-items: start;
}

.compare-results h2 {
    font-size: .85rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .5px;
    margin-bottom: 1rem;
}

.compare-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all .3s;
}
.compare-card:hover { border-color: var(--text-dim); }

.compare-best {
    border-color: var(--success) !important;
    box-shadow: 0 0 20px rgba(16,185,129,.15);
}
.compare-best .compare-net-value {
    background: linear-gradient(135deg, var(--success), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.compare-uop {
    border-color: var(--text-dim);
    background: linear-gradient(135deg, rgba(100,116,139,.08) 0%, rgba(100,116,139,.03) 100%);
}

.compare-header {
    display: flex;
    align-items: center;
    gap: .75rem;
    margin-bottom: 1rem;
}
.compare-icon { font-size: 1.5rem; }
.compare-header h3 { font-size: 1rem; font-weight: 700; margin: 0; }

.compare-net {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: .5rem;
}
.compare-net-label { font-size: .9rem; color: var(--text-muted); }
.compare-net-value {
    font-size: 1.5rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.compare-diff {
    font-size: .85rem;
    font-weight: 600;
    text-align: right;
    margin-bottom: .75rem;
    padding: .35rem .75rem;
    border-radius: 20px;
    display: inline-block;
    float: right;
}
.diff-positive { background: rgba(16,185,129,.15); color: var(--success); }
.diff-negative { background: rgba(239,68,68,.15); color: #ef4444; }
.diff-neutral { background: rgba(100,116,139,.15); color: var(--text-muted); }

.compare-details {
    clear: both;
    border-top: 1px solid var(--border);
    padding-top: .75rem;
}

.compare-row {
    display: flex;
    justify-content: space-between;
    padding: .3rem 0;
    font-size: .85rem;
    color: var(--text-muted);
}
.compare-row span:last-child { font-weight: 600; color: var(--text); font-variant-numeric: tabular-nums; }
.compare-row-total { border-top: 1px solid var(--border); padding-top: .5rem; margin-top: .25rem; }
.compare-row-total span { color: var(--warning) !important; font-weight: 700 !important; }

@media (max-width: 768px) {
    .compare-layout { grid-template-columns: 1fr; }
    .compare-card { padding: 1.25rem; }
    .compare-net-value { font-size: 1.25rem; }
}

/* === CTA === */
.cta-box {
    background: linear-gradient(135deg, rgba(37,99,235,.15) 0%, rgba(6,182,212,.1) 100%);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
}
.cta-box h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: .75rem; }
.cta-box p { color: var(--text-muted); max-width: 600px; margin: 0 auto 1.5rem; }
.btn-white {
    display: inline-flex;
    align-items: center;
    background: #fff;
    color: var(--bg) !important;
    padding: .875rem 2rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1rem;
    transition: all .2s;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(255,255,255,.2); }

/* === Footer === */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 1.5rem 0;
    text-align: center;
    margin-top: 2rem;
}
.footer p { font-size: .8rem; color: var(--text-dim); }
.footer a { color: var(--primary-light); }

/* === Responsive === */
@media (max-width: 768px) {
    .nav-links { display: none; }

    .hero h1 { font-size: 1.75rem; }
    .hero p { font-size: .95rem; }

    .calculator-layout { grid-template-columns: 1fr; }

    .calculator-form { position: static; }

    .calc-grid { grid-template-columns: 1fr; }

    .info-grid { grid-template-columns: 1fr; }

    .result-card { flex-direction: column; align-items: flex-start; gap: .25rem; }
    .result-value { align-self: flex-end; }
}

@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .calculator-form { padding: 1.25rem; }
    .hero { padding: 2rem 0 1.5rem; }
    .hero h1 { font-size: 1.5rem; }
}