:root {
  --color-primary: #536ad0;
  --color-cream: #fff8f0;
  --color-dark: #1f2024;

  --font-main: "Instrument Sans", sans-serif;
  --layout-padding: clamp(20px, 5vw, 80px);
}

/* Reset */

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

body {
  font-family: var(--font-main);
  background: var(--color-cream);
  color: var(--color-dark);
  overflow-x: hidden;
}

/* ================= NAV ================= */

.navbar {
  position: fixed;
  width: 100%;
  z-index: 2000; /* 👈 higher than overlay */
  background: rgba(255, 248, 240, 0.85);
  backdrop-filter: blur(6px);
}

.nav-container {
  padding: 1.4rem var(--layout-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo img {
  height: 30px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 1.6rem;
  list-style: none;
}

.nav-links a:not(.btn) {
  font-weight: 500;
  transition: 0.2s ease;
}

.nav-links a:not(.btn):hover {
  color: var(--color-primary);
}

.nav-links a:not(.btn) {
  text-decoration: none;
  color: var(--color-dark);
}

/* Buttons */

.btn {
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 500;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--color-dark);
  color: var(--color-cream);
}

.btn-primary:hover {
  background: var(--color-primary);
  color: var(--color-cream);
}

.btn-secondary {
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  background: transparent;
  display: inline-block;
  margin-top: 1.5rem;
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-cream);
}

/* ================= HERO ================= */

.hero {
  position: relative;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

/* Hero text bottom-left */

.hero-content {
  position: absolute;
  left: var(--layout-padding);
  bottom: clamp(80px, 12vh, 140px);
  max-width: 620px;
  z-index: 2;
}

/* Typography */

h1 {
  font-size: clamp(2.4rem, 4vw, 3rem);
  font-weight: 500;
}

.tagline {
  margin-top: 0.8rem;
  opacity: 0.7;
}

.small {
  font-size: 0.8rem;
}

.flock-container {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  z-index: 1;
}

#flock {
  width: 100%;
  height: 100%;
  display: block;
}

/* Footer */

footer {
  padding: 2rem var(--layout-padding);
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

/* ================= Mobile Nav ================= */

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  z-index: 2100;
}

.hamburger .icon {
  width: 28px;
  height: 28px;
  display: none;
}

.hamburger .icon-hamburger {
  display: block;
}

.hamburger.active .icon-hamburger {
  display: none;
}

.hamburger.active .icon-close {
  display: block;
}

/* Lock scroll when mobile menu is open */
body.menu-open {
  overflow: hidden;
}

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

@media (max-width: 768px) {
  .hero {
    display: flex;
    flex-direction: column;
    justify-content: space-between; /* pushes content to bottom */
    min-height: 100vh;
  }

  .flock-container {
    position: relative;
    width: 100%;
    flex: 1; /* takes remaining available space */
    height: auto;
    top: auto;
    right: auto;
  }

  .hero-content {
    position: relative;
    bottom: auto;
    left: auto;
    padding: 2rem var(--layout-padding);
  }

  h1 {
    font-size: 2rem;
  }

  /* Mobile nav menu */

  nav {
    position: relative;
    z-index: 1000;
  }

  /* Show hamburger */
  .hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1100;
  }

  /* Overlay base state */
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100dvh;
    background: var(--color-dark);

    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;

    transform: translateY(-100%);
    transition: transform 0.4s ease;

    z-index: 900; /* below navbar */
  }

  /* Slide in */
  .nav-links.open {
    transform: translateY(0);
    gap: 3.5rem;
  }

  /* Overlay text styles */
  .nav-links a:not(.btn) {
    color: var(--color-cream);
    font-size: 1.6rem;
  }

  .nav-links .btn-primary {
    background: var(--color-cream);
    color: var(--color-dark);
    font-size: 1.6rem;
    padding: 1rem 2rem;
  }
}