/* ========================================
   QUAQ — quaq.org
   White, minimalist, sharp corners
   ======================================== */

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

:root {
  --white: #ffffff;
  --grey-50: #f5f5f5;
  --grey-100: #eaeaea;
  --grey-200: #d4d4d4;
  --grey-500: #7a7a7a;
  --grey-700: #3a3a3a;
  --black: #000000;
  --font: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ---- CONTAINER ---- */

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.center-text {
  text-align: center;
}

/* ---- NAV ---- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--grey-100);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 4px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--grey-500);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--black);
}

.nav-cta {
  padding: 8px 20px;
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white) !important;
  transition: opacity 0.15s;
}

.nav-cta:hover {
  opacity: 0.8;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--black);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 0 24px 16px;
  gap: 12px;
  border-bottom: 1px solid var(--grey-100);
}

.nav-mobile a {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--grey-500);
}

.nav-mobile.open {
  display: flex;
}

/* ---- HERO ---- */

.hero {
  padding: 160px 0 100px;
  border-bottom: 1px solid var(--grey-100);
}

.hero-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  line-height: 1.7;
  color: var(--grey-500);
  max-width: 560px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---- BUTTONS ---- */

.btn {
  display: inline-block;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 14px 32px;
  border: 1px solid var(--black);
  cursor: pointer;
  transition: opacity 0.15s;
}

.btn:hover {
  opacity: 0.75;
}

.btn-solid {
  background: var(--black);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--black);
}

/* ---- SECTIONS ---- */

.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--grey-50);
}

.section-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-bottom: 12px;
}

.section h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 48px;
}

/* ---- GRID ---- */

.grid {
  display: grid;
  gap: 1px;
  background: var(--grey-100);
  border: 1px solid var(--grey-100);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: var(--white);
  padding: 32px;
}

.section-alt .card {
  background: var(--grey-50);
}

.card-icon {
  margin-bottom: 16px;
  color: var(--black);
}

.card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey-500);
}

/* ---- SPLIT ---- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.split-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey-500);
  margin-bottom: 24px;
}

.check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--grey-700);
  padding-left: 24px;
  position: relative;
}

.check-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--black);
  font-weight: 600;
}

/* ---- DEAD DROP MOCK ---- */

.dead-drop-mock {
  border: 1px solid var(--grey-200);
  background: var(--white);
}

.dd-header {
  padding: 16px 24px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  border-bottom: 1px solid var(--grey-100);
}

.dd-body {
  padding: 32px 24px;
}

.dd-cipher {
  font-family: 'Courier New', monospace;
  font-size: 14px;
  line-height: 2;
  color: var(--grey-500);
  letter-spacing: 2px;
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
}

.dd-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--grey-200);
  text-transform: uppercase;
}

/* ---- STEPS ---- */

.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.step {
  flex: 1;
  text-align: center;
  padding: 0 24px;
}

.step-num {
  width: 48px;
  height: 48px;
  border: 1px solid var(--black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey-500);
}

.step-line {
  width: 1px;
  height: 48px;
  background: var(--grey-200);
  margin-top: 0;
  flex-shrink: 0;
  align-self: center;
  display: none;
}

/* ---- FOOTER ---- */

.footer {
  border-top: 1px solid var(--grey-100);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.footer-copy {
  font-size: 14px;
  color: var(--grey-500);
  line-height: 1.6;
}

.footer-heading {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-bottom: 16px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col a {
  font-size: 13px;
  color: var(--grey-700);
  transition: color 0.15s;
}

.footer-col a:hover {
  color: var(--black);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--grey-100);
}

.footer-bottom p {
  font-size: 12px;
  color: var(--grey-500);
  letter-spacing: 0.5px;
}

/* ---- RESPONSIVE ---- */

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .split {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 120px 0 64px;
  }

  .hero h1 {
    letter-spacing: 0;
  }

  .hero-sub {
    font-size: 16px;
  }

  .section {
    padding: 64px 0;
  }

  .section h2 {
    margin-bottom: 32px;
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .steps {
    flex-direction: column;
    gap: 32px;
  }

  .step-line {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}