* {
  box-sizing: border-box;
}

:root {
  --bg: #0f0f0f;
  --fg: #eaeaea;
  --muted: #777;
  --line: #222;
}

html[data-theme="light"] {
  --bg: #f6f6f6;
  --fg: #111;
  --muted: #666;
  --line: #ddd;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

/* HEADER */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 80px;
  background: rgba(15, 15, 15, 0.85);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}

.nav {
  max-width: 1200px;
  height: 100%;
  margin: auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links a {
  margin-left: 32px;
  font-size: 13px;
  color: #aaa;
  text-decoration: none;
}

.nav-links a:hover {
  color: #fff;
}

.theme-toggle {
  margin-left: 32px;
  background: none;
  border: 0;
  font-size: 16px;
  cursor: pointer;
  color: inherit;
  opacity: 0.7;
}

/* HERO */
.hero {
  position: relative;
  height: 100vh;
  padding-top: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      rgba(15, 15, 15, 0.78),
      rgba(15, 15, 15, 0.88)
    ),
    url("bg-bsas-architecture.jpg") center / cover no-repeat;
  opacity: 0.3;
  z-index: -1;
}

.hero h1 {
  font-family: 'Newsreader', serif;
  font-size: clamp(4.5rem, 10vw, 8rem);
  font-weight: 400;
  line-height: 0.95;
  margin: 0;
}

.hero-role {
  margin-top: 24px;
  font-size: 18px;
}

.hero-areas {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

/* SECTIONS */
.section {
  scroll-margin-top: 100px;
}

.block {
  max-width: 900px;
  margin: 160px auto;
  padding: 0 32px;
}

.block h2 {
  font-size: 18px;
  margin-bottom: 32px;
}

.block p,
.block li {
  font-size: 17px;
  line-height: 1.65;
}

.block ul {
  padding-left: 20px;
}

/* PROCESS */
.process .step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.process span {
  color: var(--muted);
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 40px;
  font-size: 12px;
  color: var(--muted);
}