:root {
  --red: #c23c1a;
  --blue: #1c1cb0;
  --black: #0e0e0e;
  --white: #fbf9f5;

  --pad: clamp(1.5rem, 6vw, 5rem);

  --font-display: "Archivo Black", sans-serif;
  --font-body: "Archivo Expanded", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--white);
  background: var(--blue);
  overflow-x: hidden;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

a { text-decoration: none; color: inherit; }
h1 { margin: 0; font-family: var(--font-display); line-height: 0.92; }

.nav {
  position: relative;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding: 1.4rem var(--pad) 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav__link { color: var(--white); opacity: 0.95; transition: opacity 0.15s ease; }
.nav__link:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
.nav__link--current { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }

.bk-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(2rem, 6vw, 4rem) var(--pad);
}

.bk-title {
  font-weight: 800;
  font-size: clamp(2.6rem, 9vw, 6rem);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: transparent;
  -webkit-text-stroke: clamp(1.6px, 0.2vw, 2.8px) var(--white);
  text-stroke: clamp(1.6px, 0.2vw, 2.8px) var(--white);
}

.bk-subtitle {
  margin: clamp(0.75rem, 2vw, 1.25rem) 0 0;
  font-weight: 800;
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--red);
}

.bk-text {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  max-width: 26rem;
  font-weight: 600;
  font-size: clamp(0.82rem, 1.3vw, 0.95rem);
  line-height: 1.6;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: rgba(251, 249, 245, 0.7);
}

.bk-back {
  display: inline-block;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--white);
  text-decoration: underline;
  text-underline-offset: 4px;
}