/* ===========================
   Substratic — style.css
   =========================== */

:root {
  --bg: #F5F4F0;
  --text: #1A1A1A;
  --text-secondary: #666666;
  --accent: #4A90C4;
  --border: #E0DED8;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max-width: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===========================
   Background watermark
   =========================== */

.bg-mark {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(900px, 92vw);
  aspect-ratio: 7 / 6;
  background: url('/assets/logo-watermark.jpg') center / contain no-repeat;
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}

/* ===========================
   Layout
   =========================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

/* ===========================
   Header
   =========================== */

.site-header {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.header-inner {
  display: flex;
  align-items: center;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.wordmark:hover {
  color: var(--accent);
}

.logo {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  object-fit: cover;
}

/* ===========================
   Two-column main grid
   =========================== */

.main-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 4rem;
  padding-top: 4rem;
  padding-bottom: 1rem;
  align-items: start;
}

.col-main {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.col-side {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 0.5rem;
}

/* ===========================
   Hero
   =========================== */

.hero h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.1rem;
  color: var(--text);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin-bottom: 1.75rem;
  line-height: 1.7;
}

/* ===========================
   Button
   =========================== */

.btn {
  display: inline-block;
  background-color: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.65rem 1.5rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
  font-family: var(--font);
}

.btn:hover {
  background-color: #3a7db0;
}

/* ===========================
   Value Props
   =========================== */

.value-props {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.card-icon {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===========================
   About
   =========================== */

.about h2 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.about p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===========================
   Use Cases
   =========================== */

.use-cases {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.use-cases h2 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.use-cases-grid p {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.use-cases-grid ul {
  list-style: none;
  padding: 0;
}

.use-cases-grid li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===========================
   Contact
   =========================== */

.contact {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 3rem 0 4.5rem;
  position: relative;
  z-index: 1;
}

.contact-inner {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 4rem;
  align-items: start;
}

.contact-copy h2 {
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.contact-copy p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-row label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text);
}

.form-row input,
.form-row textarea {
  font-family: var(--font);
  font-size: 0.925rem;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.55rem 0.75rem;
  width: 100%;
  transition: border-color 0.15s ease;
  -webkit-appearance: none;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-row textarea {
  resize: vertical;
  min-height: 110px;
}

/* ===========================
   Footer
   =========================== */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  position: relative;
  z-index: 1;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer span {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.site-footer a {
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.site-footer a:hover {
  color: var(--accent);
}

.icon-linkedin {
  width: 18px;
  height: 18px;
  display: block;
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 800px) {
  .main-grid {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 2.5rem;
  }

  .col-main {
    gap: 2.5rem;
  }

  .col-side {
    border-top: 1px solid var(--border);
    margin-top: 2.5rem;
    padding-top: 2.5rem;
    gap: 1.75rem;
  }

  .cards {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .contact-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero h1 {
    font-size: 1.65rem;
  }
}