.site-nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 50;
  transition: background-color 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
  backdrop-filter: saturate(120%) blur(2px);
}

.site-nav.scrolled {
  background: rgba(237, 224, 207, 0.94);
  border-color: var(--border);
}

.nav-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.15rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.58rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.11em;
}

.brand img {
  width: 30px;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.7rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(26, 26, 24, 0.86);
}

.menu-btn {
  border: 1px solid var(--border);
  background: transparent;
  padding: 0.42rem 0.62rem;
  font-size: 11px;
  letter-spacing: 0.08em;
}

.mobile-menu {
  display: none;
  padding-bottom: 1rem;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.mobile-menu.open {
  display: grid;
  gap: 0.6rem;
}

.btn,
button,
input {
  font: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 12px 28px;
  border-radius: 2px;
  border: 1.5px solid transparent;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.btn:focus-visible,
input:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-outline {
  border-color: var(--text-primary);
}

.btn-outline:hover {
  transform: translateY(-2px);
}

.email-row {
  display: grid;
  gap: 0.68rem;
  margin-top: 1rem;
}

.email-input {
  width: 100%;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 2px;
  min-height: 46px;
  padding: 0.7rem 0.95rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.02em;
}

.email-input:focus {
  border-color: var(--accent);
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 25px 28px;
}

.selectable {
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.selectable.active {
  border: 2px solid var(--accent);
  background: #f2e6d7;
}

.note-card {
  background: #f3e7d7;
  border: 1px solid rgba(26, 26, 24, 0.15);
}

.note-card:nth-child(2) {
  transform: rotate(-1deg);
}

.note-card:nth-child(3) {
  transform: rotate(0.9deg);
}

.dark-section p {
  color: rgba(253, 250, 246, 0.72);
}

.dark-section .email-input {
  background: #f5ede2;
}

.success-message {
  display: none;
  margin-top: 0.8rem;
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
}

.success-message.show {
  display: block;
}

.phone-mockup {
  width: min(300px, 100%);
  background: #201f1c;
  border-radius: 28px;
  padding: 16px;
  border: 3px solid #2f2d29;
}

.phone-screen {
  border-radius: 20px;
  background: #f1e4d3;
  min-height: 460px;
  padding: 1rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
}

.phone-task {
  border: 1px solid var(--border);
  padding: 0.6rem;
  margin-top: 0.7rem;
}

@media (min-width: 768px) {
  .nav-links {
    display: inline-flex;
  }
  .menu-btn {
    display: none;
  }
  .email-row {
    grid-template-columns: 1fr auto;
    align-items: stretch;
  }

  .nav-links .btn {
    padding-inline: 20px;
  }
}