/* style.css — Skullflusher design tokens + components */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.5rem, 0.5rem + 4.5vw, 5.25rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Color — near-black, bone/ice accent, cold rim-light cyan */
  --color-bg: #060607;
  --color-surface: #0c0c0e;
  --color-surface-2: #101012;
  --color-surface-offset: #151517;
  --color-divider: #232326;
  --color-border: #2c2c30;

  --color-text: #eae7e0;
  --color-text-muted: #9a978f;
  --color-text-faint: #63615c;
  --color-text-inverse: #0a0a0b;

  /* Primary accent — cold rim-light teal/cyan, matched to product photography */
  --color-primary: #8fe3d8;
  --color-primary-hover: #a9ecdf;
  --color-primary-active: #6fc9bd;
  --color-primary-dim: #365a55;

  /* Secondary accent — bone white for skull motif */
  --color-bone: #e6e2d8;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 40px rgba(143, 227, 216, 0.15);

  --content-narrow: 640px;
  --content-default: 900px;
  --content-wide: 1200px;

  --font-display: 'Erode', 'Georgia', serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

/* ---------- Base page treatment ---------- */

body {
  background: var(--color-bg);
  background-image:
    radial-gradient(ellipse 900px 600px at 50% -10%, rgba(143, 227, 216, 0.07), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 40%, rgba(143, 227, 216, 0.04), transparent 60%);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--content-default);
  margin: 0 auto;
  padding-inline: var(--space-6);
}

/* ---------- Noise texture overlay ---------- */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(6, 6, 7, 0.75), transparent);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-bone);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.logo svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.header-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: var(--space-8);
  padding: calc(var(--space-16) + var(--space-6)) var(--space-6) var(--space-16);
  max-width: var(--content-wide);
  margin: 0 auto;
}

.hero-copy {
  position: relative;
  z-index: 3;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-primary-dim);
  border-radius: var(--radius-full);
  background: rgba(143, 227, 216, 0.06);
  margin-bottom: var(--space-6);
}

.eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 8px var(--color-primary);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 500;
  line-height: 1.05;
  color: var(--color-bone);
  margin-bottom: var(--space-5);
}

.hero-title em {
  font-style: normal;
  color: var(--color-primary);
  background: linear-gradient(180deg, var(--color-primary-hover), var(--color-primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-oneliner {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 34ch;
  margin-bottom: var(--space-8);
}

/* ---------- Waitlist form ---------- */
.waitlist-form {
  display: flex;
  gap: var(--space-3);
  max-width: 460px;
  margin-bottom: var(--space-4);
}

.waitlist-form input[type='email'] {
  flex: 1;
  min-width: 0;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--text-sm);
}

.waitlist-form input[type='email']::placeholder {
  color: var(--color-text-faint);
}

.waitlist-form input[type='email']:focus-visible {
  border-color: var(--color-primary);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  min-height: 1.4em;
}

.form-note.success {
  color: var(--color-primary);
}

.form-note.error {
  color: #e8a2a2;
}

/* ---------- Hero visual ---------- */
.hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual-frame {
  position: relative;
  width: 100%;
  max-width: 460px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 30%, rgba(143, 227, 216, 0.12), transparent 65%);
}

.hero-visual-frame img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.7));
}

.hero-visual-caption {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  background: rgba(6, 6, 7, 0.6);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-divider);
}

/* ---------- Section shared ---------- */
section {
  position: relative;
  z-index: 2;
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.section-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-bone);
  margin-bottom: var(--space-6);
  max-width: 20ch;
}

/* ---------- Concept / description section ---------- */
.concept {
  border-top: 1px solid var(--color-divider);
}

.concept-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-16);
  align-items: center;
}

.concept-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
}

.concept-visual img {
  width: 100%;
  height: auto;
  display: block;
}

.concept-copy p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-4);
}

.concept-copy p strong {
  color: var(--color-text);
  font-weight: 600;
}

.spec-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.spec-item {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}

.spec-item span.dot {
  color: var(--color-primary);
  font-family: var(--font-mono);
}

/* ---------- Taglines section ---------- */
.taglines {
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.taglines-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.tagline-card {
  padding: var(--space-8) var(--space-6);
  border-right: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition-interactive);
}

.tagline-card:hover {
  background: var(--color-surface-offset);
}

.tagline-card p {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-bone);
  line-height: 1.3;
}

.tagline-card .num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  letter-spacing: 0.1em;
}

/* ---------- Final CTA ---------- */
.final-cta {
  text-align: center;
}

.final-cta .container {
  max-width: 640px;
}

.final-cta .waitlist-form {
  margin: 0 auto var(--space-4);
}

.final-cta .form-note {
  text-align: center;
}

.final-cta .section-heading {
  margin-inline: auto;
  text-align: center;
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-6);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  max-width: var(--content-wide);
  margin: 0 auto;
}

.footer-inner p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-links {
  display: flex;
  gap: var(--space-5);
}

.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 700ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: calc(var(--space-20) + var(--space-6));
    text-align: left;
    gap: var(--space-12);
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual-frame {
    max-width: 320px;
    margin: 0 auto;
  }

  .concept-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .concept-visual {
    max-width: 320px;
    margin: 0 auto;
  }
}

@media (max-width: 600px) {
  .waitlist-form {
    flex-direction: column;
  }

  .btn-primary {
    width: 100%;
  }

  .tagline-card {
    border-right: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }
}