Add tarjouspyynto page with price calculator, update contact info and nav links

- New tarjouspyynto.html with real-time price calculator sidebar
- Updated company info: Web1 Oy, Latokarinkatu 3, 20200 Turku
- Nav links point to dedicated tarjouspyynto page across all pages
- CTA buttons on yhteydet.html link to tarjouspyynto page
- Calculator CSS for responsive two-column layout

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

style.css

@@ -1505,6 +1505,188 @@ a:hover {
     height: 100%;
 }
 
+/* === Calculator Layout === */
+.calculator-layout {
+    display: grid;
+    grid-template-columns: 1fr 360px;
+    gap: 40px;
+    align-items: start;
+}
+
+.calculator-form {
+    min-width: 0;
+}
+
+.calculator-form .form-section-title {
+    border-top: 1px solid var(--color-border);
+    padding-top: 20px;
+    margin-top: 24px;
+    font-weight: 700;
+    font-size: 1rem;
+    color: var(--color-text-heading);
+}
+
+.calculator-form .form-section-title:first-child {
+    border-top: none;
+    margin-top: 0;
+    padding-top: 0;
+}
+
+.calculator-form .form-group {
+    margin-bottom: 16px;
+}
+
+.calculator-form .form-group label {
+    display: block;
+    font-size: 0.88rem;
+    font-weight: 500;
+    margin-bottom: 6px;
+    color: var(--color-text-heading);
+}
+
+.calculator-form .checkbox-group {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 10px;
+    margin-bottom: 16px;
+}
+
+.calculator-sidebar {
+    position: sticky;
+    top: 100px;
+}
+
+.price-calculator {
+    background: var(--color-dark);
+    color: var(--color-white);
+    border-radius: var(--radius-lg);
+    padding: 30px;
+    margin-bottom: 20px;
+}
+
+.price-calculator h3 {
+    font-size: 0.9rem;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    opacity: 0.7;
+    margin-bottom: 10px;
+}
+
+.calculator-total {
+    display: flex;
+    align-items: baseline;
+    gap: 4px;
+    margin-bottom: 6px;
+}
+
+.calculator-amount {
+    font-size: 2.5rem;
+    font-weight: 700;
+    color: var(--color-primary);
+    font-family: 'Space Grotesk', sans-serif;
+}
+
+.calculator-period {
+    font-size: 1.1rem;
+    opacity: 0.6;
+}
+
+.calculator-vat {
+    font-size: 0.8rem;
+    opacity: 0.5;
+    margin-bottom: 20px;
+}
+
+.calculator-breakdown {
+    border-top: 1px solid rgba(255,255,255,0.1);
+    padding-top: 16px;
+}
+
+.calculator-empty {
+    font-size: 0.88rem;
+    opacity: 0.5;
+    font-style: italic;
+}
+
+.calc-line {
+    display: flex;
+    justify-content: space-between;
+    font-size: 0.88rem;
+    padding: 6px 0;
+    border-bottom: 1px solid rgba(255,255,255,0.05);
+}
+
+.calc-line span:first-child {
+    opacity: 0.8;
+}
+
+.calc-line span:last-child {
+    font-weight: 600;
+    color: var(--color-primary);
+}
+
+.calculator-note {
+    display: flex;
+    align-items: flex-start;
+    gap: 8px;
+    margin-top: 16px;
+    padding: 12px;
+    background: rgba(240,112,96,0.1);
+    border-radius: var(--radius);
+    font-size: 0.8rem;
+    line-height: 1.4;
+}
+
+.calculator-note svg {
+    flex-shrink: 0;
+    margin-top: 1px;
+    color: var(--color-primary);
+}
+
+.calculator-contact {
+    background: var(--color-white);
+    border: 1px solid var(--color-border);
+    border-radius: var(--radius-lg);
+    padding: 24px;
+}
+
+.calculator-contact h4 {
+    font-size: 1rem;
+    margin-bottom: 8px;
+    color: var(--color-text-heading);
+}
+
+.calculator-contact p {
+    font-size: 0.88rem;
+    color: var(--color-text-muted);
+    margin-bottom: 12px;
+}
+
+.calculator-email {
+    display: block;
+    color: var(--color-primary);
+    font-weight: 600;
+    margin-bottom: 16px;
+}
+
+.calculator-address {
+    font-size: 0.85rem;
+    color: var(--color-text-muted);
+    line-height: 1.6;
+    padding-top: 12px;
+    border-top: 1px solid var(--color-border);
+}
+
+@media (max-width: 900px) {
+    .calculator-layout {
+        grid-template-columns: 1fr;
+    }
+    .calculator-sidebar {
+        position: static;
+        order: -1;
+    }
+}
+
 /* === Animations === */
 .fade-in {
     opacity: 0;