/* MT Cool landing */
:root {
  --bg: #0c1117;
  --surface: #151c26;
  --border: #243044;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --accent: #3d9cf0;
  --accent-hover: #5cb0ff;
  --success: #3dd68c;
  --radius: 12px;
  --nav-h: 64px;
  /* Source Sans 3 loaded in index.html (Google Fonts, latin-ext) */
  --font: "Source Sans 3", system-ui, "Segoe UI", Roboto, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-hover);
}

/* Sticky header + horizontal nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 17, 23, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--nav-h);
}

/* Logo image (wide canvas: crop empty area on the right) */
.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 0;
  max-width: min(200px, 42vw);
  overflow: hidden;
}
.logo:hover img {
  opacity: 0.92;
}
.logo img {
  height: 40px;
  width: auto;
  max-width: none;
  display: block;
  object-fit: contain;
  object-position: left center;
}

/* Desktop: menu items in a row */
.nav-toggle {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.25rem;
}

.main-nav a {
  display: block;
  padding: 0.5rem 0.85rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--text);
  background: var(--surface);
  outline: none;
}

/* Tablet: horizontal scroll nav */
@media (max-width: 900px) {
  .main-nav {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    max-width: min(100vw - 8rem, 520px);
  }
  .main-nav ul {
    gap: 0.15rem;
  }
  .main-nav a {
    padding: 0.45rem 0.65rem;
    font-size: 0.82rem;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }
  .main-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--nav-h);
    max-width: none;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    overflow: visible;
    display: none;
  }
  .main-nav.is-open {
    display: block;
  }
  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1rem 1rem;
    gap: 0;
  }
  .main-nav a {
    white-space: normal;
    padding: 0.65rem 0.75rem;
    border-radius: var(--radius);
  }
}

/* Main sections */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

section {
  scroll-margin-top: calc(var(--nav-h) + 12px);
  padding: 2.5rem 0;
}

section:not(:last-of-type) {
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.grid-2 {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.service-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}
.service-list li {
  margin-bottom: 0.5rem;
}

/* Calculator block */
.calc-form label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.calc-form input,
.calc-form select,
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

.calc-form input:focus,
.calc-form select:focus,
.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.calc-row {
  margin-bottom: 1rem;
}

.calc-actions {
  margin-top: 1.25rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.25rem;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #061018;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  font-family: inherit;
}
.btn:hover {
  background: var(--accent-hover);
}

.calc-result {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(61, 156, 240, 0.08);
  display: none;
}
.calc-result.is-visible {
  display: block;
}
.calc-result strong {
  color: var(--success);
  font-size: 1.25rem;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

/* FAQ */
details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.65rem;
  background: var(--surface);
  padding: 0 1rem;
}
details summary {
  cursor: pointer;
  padding: 1rem 0;
  font-weight: 600;
  list-style: none;
}
details summary::-webkit-details-marker {
  display: none;
}
details[open] summary {
  border-bottom: 1px solid var(--border);
}
details .faq-body {
  padding: 0.85rem 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Contact form */
.contact-form .row {
  margin-bottom: 1rem;
}
.contact-form label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}

.form-msg {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  display: none;
}
.form-msg.is-error {
  display: block;
  background: rgba(255, 80, 80, 0.12);
  border: 1px solid rgba(255, 100, 100, 0.35);
  color: #ffb4b4;
}
.form-msg.is-ok {
  display: block;
  background: rgba(61, 214, 140, 0.12);
  border: 1px solid rgba(61, 214, 140, 0.35);
  color: #b8f5d4;
}

.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}