/* =====================================================================
   Marlow — waitlist landing page
   Minimalist typography · constrained palette · mobile-first
   ===================================================================== */

/* ---- Design tokens -------------------------------------------------- */
:root {
  /* Constrained palette: warm paper, deep ink, one burnt-amber accent */
  --color-bg: #f7f4ee;
  --color-surface: #ffffff;
  --color-ink: #17150f;
  --color-text: #35322a;
  --color-muted: #857f72;
  --color-line: #e3ddd1;
  --color-accent: #c7521a;
  --color-accent-strong: #a53f11;
  --color-inverse: #1c1a14;
  --color-inverse-text: #efe9dc;
  --color-success: #3f8f57;
  --color-error: #c0392b;

  /* Typography scale */
  --text-xs: 0.78rem;
  --text-sm: 0.9rem;
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: clamp(1.75rem, 1.3rem + 1.6vw, 2.25rem);
  --text-3xl: clamp(2rem, 1.4rem + 3vw, 3rem);
  --text-4xl: clamp(2.5rem, 1.6rem + 4.4vw, 4rem);

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;
  --space-11: 6.5rem;
  --space-12: 8rem;

  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1080px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ---- Reset ---------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family:
    "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
figure,
blockquote {
  margin: 0;
}

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

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

/* ---- Utilities ------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -3rem;
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-ink);
  color: var(--color-inverse-text);
  border-radius: var(--radius);
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: var(--space-4);
}

.eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
}

.section-title {
  font-size: var(--text-3xl);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--color-ink);
}

/* ---- Header --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(120%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}

.site-header--scrolled {
  border-bottom-color: var(--color-line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

.logo__mark {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: inset 0 0 0 3px var(--color-bg), 0 0 0 1px var(--color-accent);
}

.logo__word {
  font-size: var(--text-lg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
}

.site-nav a {
  color: var(--color-muted);
  transition: color 0.15s var(--ease);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-ink);
}

.site-nav__cta {
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  border: 1px solid var(--color-line);
  color: var(--color-ink) !important;
}

.site-nav__cta:hover,
.site-nav__cta:focus-visible {
  border-color: var(--color-ink);
}

/* Hide secondary nav links on the smallest screens, keep the CTA */
.site-nav a:not(.site-nav__cta) {
  display: none;
}

/* ---- Hero ----------------------------------------------------------- */
.hero {
  padding-block: var(--space-9) var(--space-10);
}

.hero__inner {
  max-width: 760px;
}

.hero__title {
  margin-top: var(--space-4);
  font-size: var(--text-4xl);
  line-height: 1.02;
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--color-ink);
}

.hero__title-accent {
  color: var(--color-accent);
}

.hero__lede {
  margin-top: var(--space-5);
  max-width: 44ch;
  font-size: var(--text-lg);
  color: var(--color-muted);
}

.hero__count {
  margin-top: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.hero__count strong {
  color: var(--color-ink);
}

/* ---- Email capture form -------------------------------------------- */
.capture {
  margin-top: var(--space-7);
  max-width: 30rem;
}

.capture__row {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.capture__input {
  flex: 1;
  min-width: 0;
  padding: var(--space-4) var(--space-5);
  font: inherit;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition:
    border-color 0.15s var(--ease),
    box-shadow 0.15s var(--ease);
}

.capture__input::placeholder {
  color: var(--color-muted);
}

.capture__input:hover {
  border-color: color-mix(in srgb, var(--color-ink) 30%, var(--color-line));
}

.capture__input:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 25%, transparent);
}

.capture__input[aria-invalid="true"] {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-error) 20%, transparent);
}

.capture__note {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-muted);
  min-height: 1.2em;
  transition: color 0.2s var(--ease);
}

.capture__note--error {
  color: var(--color-error);
  font-weight: 600;
}

.capture__note--success {
  color: var(--color-success);
  font-weight: 600;
}

/* Dark variant used inside the final CTA */
.capture--dark {
  margin-inline: auto;
}

.capture--dark .capture__input {
  background: color-mix(in srgb, var(--color-inverse) 82%, #000);
  border-color: color-mix(in srgb, var(--color-inverse-text) 22%, transparent);
  color: var(--color-inverse-text);
}

.capture--dark .capture__input::placeholder {
  color: color-mix(in srgb, var(--color-inverse-text) 55%, transparent);
}

.capture--dark .capture__note {
  color: color-mix(in srgb, var(--color-inverse-text) 70%, transparent);
}

/* ---- Morphing button ----------------------------------------------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  overflow: hidden;
  white-space: nowrap;
  transition:
    background-color 0.25s var(--ease),
    transform 0.1s var(--ease),
    box-shadow 0.2s var(--ease);
}

.btn:hover {
  background: var(--color-accent-strong);
  box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--color-accent) 70%, transparent);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0) scale(0.99);
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 45%, transparent);
}

/* Each state-label is stacked; only the active one is shown */
.btn__label,
.btn__spinner,
.btn__done,
.btn__retry {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.btn__spinner,
.btn__done,
.btn__retry {
  display: none;
}

.btn__spinner {
  width: 1.15rem;
  height: 1.15rem;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: btn-spin 0.7s linear infinite;
}

.btn__check {
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: #fff;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
}

/* State: loading */
.btn[data-state="loading"] {
  background: var(--color-accent);
  cursor: progress;
  pointer-events: none;
}

.btn[data-state="loading"] .btn__label {
  display: none;
}

.btn[data-state="loading"] .btn__spinner {
  display: inline-flex;
}

/* State: success */
.btn[data-state="success"] {
  background: var(--color-success);
  pointer-events: none;
}

.btn[data-state="success"] .btn__label {
  display: none;
}

.btn[data-state="success"] .btn__done {
  display: inline-flex;
}

.btn[data-state="success"] .btn__check {
  animation: btn-check 0.4s var(--ease) forwards;
}

/* State: error */
.btn[data-state="error"] {
  background: var(--color-error);
  animation: btn-shake 0.4s var(--ease);
}

.btn[data-state="error"] .btn__label {
  display: none;
}

.btn[data-state="error"] .btn__retry {
  display: inline-flex;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes btn-check {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes btn-shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(6px);
  }
  60% {
    transform: translateX(-4px);
  }
  80% {
    transform: translateX(4px);
  }
}

/* ---- Benefits ------------------------------------------------------- */
.benefits {
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-line);
}

.benefits__grid {
  margin-top: var(--space-8);
  display: grid;
  gap: var(--space-7);
  grid-template-columns: 1fr;
}

.benefit__num {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: color-mix(in srgb, var(--color-accent) 35%, var(--color-line));
  letter-spacing: -0.02em;
}

.benefit__title {
  margin-top: var(--space-3);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

.benefit__body {
  margin-top: var(--space-3);
  color: var(--color-muted);
  max-width: 42ch;
}

/* ---- Social proof --------------------------------------------------- */
.proof {
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-line);
}

.proof__stats {
  margin-top: var(--space-8);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding: var(--space-7);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  text-align: center;
}

.stat__value {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.stat__label {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.proof__grid {
  margin-top: var(--space-7);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.quote {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition:
    transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.quote:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px -24px rgba(23, 21, 15, 0.35);
}

.quote blockquote {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink);
}

.quote__by {
  margin-top: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.quote__by strong {
  display: block;
  color: var(--color-ink);
}

.quote__role {
  color: var(--color-muted);
}

.quote__avatar {
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-accent-strong);
  background: color-mix(in srgb, var(--color-accent) 14%, var(--color-bg));
}

/* ---- Final CTA ------------------------------------------------------ */
.final-cta {
  padding-block: var(--space-11);
  background: var(--color-inverse);
  color: var(--color-inverse-text);
}

.final-cta__inner {
  max-width: 620px;
  text-align: center;
}

.final-cta__title {
  font-size: var(--text-3xl);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: #fff;
}

.final-cta__lede {
  margin-top: var(--space-4);
  color: color-mix(in srgb, var(--color-inverse-text) 78%, transparent);
  font-size: var(--text-lg);
}

/* ---- Footer --------------------------------------------------------- */
.site-footer {
  padding-block: var(--space-7);
  background: var(--color-bg);
  border-top: 1px solid var(--color-line);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  text-align: center;
}

.site-footer__copy {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-5);
  font-size: var(--text-sm);
}

.site-footer__nav a {
  color: var(--color-muted);
  transition: color 0.15s var(--ease);
}

.site-footer__nav a:hover,
.site-footer__nav a:focus-visible {
  color: var(--color-ink);
}

/* ---- Scroll reveal -------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s var(--ease),
    transform 0.6s var(--ease);
  will-change: opacity, transform;
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Responsive ----------------------------------------------------- */
@media (min-width: 640px) {
  .container {
    padding-inline: var(--space-6);
  }

  .capture__row {
    flex-direction: row;
    align-items: stretch;
  }

  .btn {
    min-width: 11rem;
  }

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

@media (min-width: 768px) {
  .site-nav a:not(.site-nav__cta) {
    display: inline;
  }

  .hero {
    padding-block: var(--space-11) var(--space-12);
  }

  .benefits__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8) var(--space-9);
  }

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

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-8);
  }

  .benefits,
  .proof {
    padding-block: var(--space-12);
  }
}

/* ---- Reduced motion ------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .btn__spinner {
    animation: btn-spin 0.7s linear infinite;
  }
}