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

:root {
    --red: #DC2626;
    --red-dark: #B91C1C;
    --red-light: #FEE2E2;
    --red-border: #FECACA;
    --dark: #111827;
    --gray-700: #374151;
    --gray-500: #6B7280;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --white: #FFFFFF;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

body { font-family: var(--font); color: var(--gray-700); background: var(--white); line-height: 1.6; }

/* ── NAV ── */
nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--gray-200);
    background: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo { font-size: 1.4rem; font-weight: 700; text-decoration: none; letter-spacing: -0.02em; }
.logo .clinic { color: var(--dark); }
.logo .fixed { color: var(--red); }

.nav-links { display: flex; gap: 1.5rem; list-style: none; align-items: center; }
.nav-links a { color: var(--gray-500); text-decoration: none; font-size: 0.875rem; font-weight: 500; transition: color 0.15s; }
.nav-links a:hover { color: var(--red); }

/* ── CURRENCY TOGGLE ── */
.currency-bar {
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    padding: 0.5rem 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--gray-500);
}

.toggle-wrap { display: flex; border: 1.5px solid var(--gray-300); border-radius: 6px; overflow: hidden; }

.toggle-btn {
    padding: 0.3rem 0.75rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    font-family: var(--font);
    font-weight: 500;
    color: var(--gray-500);
    transition: background 0.15s, color 0.15s;
}

.toggle-btn.active { background: var(--dark); color: var(--white); }

/* ── HERO ── */
.hero {
    padding: 3rem 2rem 2rem;
    max-width: 660px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.25;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.hero p { font-size: 1.05rem; color: var(--gray-500); }

/* ── CALC CARD ── */
.calc-card {
    background: var(--white);
    border: 1.5px solid var(--gray-200);
    border-radius: 12px;
    padding: 2rem;
    max-width: 620px;
    margin: 1.5rem auto;
    box-shadow: var(--shadow-md);
}

/* ── FORM ── */
.field { margin-bottom: 1.5rem; }

.field label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.25rem;
}

.field .hint {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 0.4rem;
}

.input-wrap { position: relative; }

.input-prefix {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-500);
    font-weight: 500;
    pointer-events: none;
}

input[type="number"] {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font);
    color: var(--dark);
    transition: border-color 0.15s;
    appearance: textfield;
    -moz-appearance: textfield;
}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }
input[type="number"].no-prefix { padding-left: 1rem; }
input[type="number"]:focus { outline: none; border-color: var(--red); }

.divider { border: none; border-top: 1px solid var(--gray-200); margin: 0.5rem 0 1.5rem; }

.btn-calc {
    width: 100%;
    padding: 0.9rem;
    background: var(--red);
    color: var(--white);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
    font-family: var(--font);
    letter-spacing: 0.01em;
}
.btn-calc:hover { background: var(--red-dark); }

/* ── RESULTS ── */
.results {
    display: none;
    background: var(--red-light);
    border: 1.5px solid var(--red-border);
    border-radius: 12px;
    padding: 2rem;
    max-width: 620px;
    margin: 0 auto 1.5rem;
}
.results.show { display: block; }

.results-heading {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-500);
    margin-bottom: 1.25rem;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--red-border);
}
.result-row:last-of-type { border-bottom: none; }

.result-label { font-size: 0.9rem; color: var(--gray-700); }

.result-value { font-size: 1.15rem; font-weight: 700; color: var(--red); }
.result-value.big { font-size: 1.65rem; }

.result-message {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--red-border);
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.6;
}

/* ── CTA ── */
.cta-box {
    max-width: 620px;
    margin: 0 auto 2rem;
    padding: 2rem;
    background: var(--gray-100);
    border-radius: 12px;
    text-align: center;
    display: none;
}
.cta-box.show { display: block; }

.cta-box h3 { font-size: 1.15rem; font-weight: 700; color: var(--dark); margin-bottom: 0.4rem; }
.cta-box p { color: var(--gray-500); font-size: 0.9rem; margin-bottom: 1.25rem; }

.btn-cta {
    display: inline-block;
    padding: 0.9rem 2rem;
    background: var(--red);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    transition: background 0.15s;
}
.btn-cta:hover { background: var(--red-dark); }

/* ── OTHER CALCULATORS ── */
.other-calcs {
    max-width: 620px;
    margin: 0 auto 4rem;
    padding: 0 2rem;
}

.other-calcs h4 {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-500);
    margin-bottom: 0.75rem;
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
}

.calc-link {
    display: block;
    padding: 0.85rem 1rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--dark);
    font-size: 0.85rem;
    font-weight: 500;
    transition: border-color 0.15s, color 0.15s;
}
.calc-link:hover { border-color: var(--red); color: var(--red); }
.calc-link span { display: block; font-size: 0.75rem; color: var(--gray-500); font-weight: 400; margin-top: 0.1rem; }

/* ── HOMEPAGE GRID ── */
.page-wrap { max-width: 900px; margin: 0 auto; padding: 0 2rem; }

.section-heading {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
}

.card {
    border: 1.5px solid var(--gray-200);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--dark);
    transition: border-color 0.15s, box-shadow 0.15s;
    display: block;
}
.card:hover { border-color: var(--red); box-shadow: var(--shadow-md); }

.card-icon { font-size: 1.5rem; margin-bottom: 0.75rem; }
.card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.4rem; }
.card p { font-size: 0.85rem; color: var(--gray-500); line-height: 1.5; }
.card .card-cta { font-size: 0.8rem; color: var(--red); font-weight: 600; margin-top: 0.75rem; }

/* ── FOOTER ── */
footer {
    border-top: 1px solid var(--gray-200);
    padding: 2rem;
    text-align: center;
    color: var(--gray-500);
    font-size: 0.8rem;
}
footer a { color: var(--red); text-decoration: none; }

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
    nav { padding: 1rem; }
    .nav-links { display: none; }
    .currency-bar { padding: 0.5rem 1rem; }
    .hero { padding: 2rem 1rem 1rem; }
    .hero h1 { font-size: 1.5rem; }
    .calc-card, .results, .cta-box { padding: 1.25rem; margin-left: 1rem; margin-right: 1rem; }
    .other-calcs { padding: 0 1rem; }
    .calc-grid { grid-template-columns: 1fr; }
    .result-value.big { font-size: 1.35rem; }
    .page-wrap { padding: 0 1rem; }
    .cards { grid-template-columns: 1fr; }
}