/* GuessWho marketing site.
 *
 * Hand-written CSS, no framework (mirrors the Mantra Moment site). One page.
 * Light and dark palettes via CSS variables + prefers-color-scheme.
 * Fluid type with clamp(); single mobile breakpoint at 42rem.
 */

/* ---- Palette -------------------------------------------------------------
 * Light is the default; the dark block below overrides the variables. */
:root {
  color-scheme: light dark;

  --bg:        #eef2fb;
  --bg2:       #e3e9f7;
  --surface:   #ffffff;
  --card:      #ffffff;
  --ink:       #17213a;
  --muted:     #55617c;
  --line:      rgba(23, 33, 58, 0.12);
  --accent:    #e0592f;   /* warm coral — "human / memory" */
  --accent-2:  #2d63c7;   /* cool indigo — links & accents  */
  --on-accent: #ffffff;
  --shadow:    0 24px 60px -28px rgba(23, 33, 58, 0.45);
  --shadow-sm: 0 10px 30px -18px rgba(23, 33, 58, 0.5);

  --bezel:     #0c1730;

  --wrap: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0b1b34;
    --bg2:       #0a1220;
    --surface:   rgba(255, 255, 255, 0.05);
    --card:      #12233f;
    --ink:       #f2f6ff;
    --muted:     #a7b4d0;
    --line:      rgba(255, 255, 255, 0.12);
    --accent:    #ff835b;
    --accent-2:  #8fb4ff;
    --on-accent: #201007;
    --shadow:    0 30px 70px -30px rgba(0, 0, 0, 0.75);
    --shadow-sm: 0 12px 34px -20px rgba(0, 0, 0, 0.7);
    --bezel:     #05080f;
  }
}

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

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(60rem 60rem at 85% -10%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%),
    radial-gradient(50rem 50rem at -10% 10%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  background-attachment: fixed;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3 { line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 0.4em; }

a { color: var(--accent-2); }

p { margin: 0 0 1rem; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.section-lead {
  color: var(--muted);
  font-size: clamp(1.05rem, 0.9rem + 0.7vw, 1.3rem);
  max-width: 46rem;
}

.ico {
  font-size: 1.6rem;
  line-height: 1;
  margin-bottom: 0.6rem;
}
.ico-lg { font-size: 2.6rem; }

/* ---- Skip link ----------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--on-accent);
  padding: 0.6rem 1rem;
  border-radius: 0 0 0.6rem 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 650;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.7rem 1.4rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
  font: inherit;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-lg { padding: 0.95rem 2rem; font-size: 1.1rem; }
.btn:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent-2) 72%, transparent);
  outline-offset: 3px;
}

.cta-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.4rem;
}
.cta-center { justify-content: center; }

/* ---- Header -------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.4) blur(12px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.7rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 750;
  font-size: 1.15rem;
}
.brand-icon { border-radius: 9px; box-shadow: var(--shadow-sm); }

/* ---- Hero ---------------------------------------------------------------- */
.hero { padding-block: clamp(2.5rem, 6vw, 5rem); }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 1.4rem + 4.4vw, 4.4rem);
  font-weight: 800;
}
.hero h1 em { color: var(--accent); font-style: normal; }
.lead {
  font-size: clamp(1.1rem, 0.95rem + 0.8vw, 1.4rem);
  color: var(--muted);
  max-width: 34rem;
}

/* Rotating "how you met" card */
.memory-card {
  margin: 2rem 0 0;
  padding: 1.1rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  max-width: 34rem;
}
.memory-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.memory-stack {
  display: grid;         /* all cards share one cell → sizes to the tallest */
}
.memory {
  grid-area: 1 / 1;
  margin: 0;
  font-size: 1.05rem;
  color: var(--ink);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.memory.is-active { opacity: 1; transform: none; }
.memory strong { color: var(--accent); font-weight: 700; }

/* ---- Device frame (pure CSS) -------------------------------------------- */
.hero-device { display: flex; justify-content: center; }
.phone {
  width: min(20rem, 78vw);
  aspect-ratio: 1206 / 2622;
  background: var(--bezel);
  border-radius: 2.4rem;
  padding: 0.55rem;
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  position: relative;
}
.phone::before { /* notch / camera bar */
  content: "";
  position: absolute;
  top: 0.9rem;
  left: 50%;
  transform: translateX(-50%);
  width: 32%;
  height: 0.42rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  z-index: 2;
}
.phone-sm { width: min(17rem, 70vw); }
.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 1.95rem;
  overflow: hidden;
  background: linear-gradient(160deg, var(--bg2), var(--bg));
}
.phone-screen picture { display: block; width: 100%; height: 100%; }
.phone-screen img { width: 100%; height: 100%; object-fit: cover; }
.hero-slideshow { display: grid; }
.hero-shot {
  grid-area: 1 / 1;
  opacity: 0;
  transition: opacity 0.6s ease;
}
.hero-shot.is-active { opacity: 1; }

/* Clearly-marked placeholder until real screenshots land */
.shot-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-align: center;
  padding: 1.2rem;
  color: var(--muted);
  background:
    repeating-linear-gradient(
      45deg,
      color-mix(in srgb, var(--accent) 8%, transparent) 0,
      color-mix(in srgb, var(--accent) 8%, transparent) 12px,
      transparent 12px,
      transparent 24px);
}
.shot-tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--accent);
}
.shot-name { font-weight: 650; color: var(--ink); }
.shot-size { font-size: 0.8rem; opacity: 0.7; }

/* ---- Story --------------------------------------------------------------- */
.story { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.story h2 { font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.8rem); }
.story-cards {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.story-cell {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
}
.story-cell h3 { font-size: 1.2rem; }
.story-cell p { color: var(--muted); margin: 0; }

/* ---- Feature split (LinkedIn) ------------------------------------------- */
.feature-split { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.split-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.split-grid h2 { font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.8rem); }
.split-media { display: flex; justify-content: center; }
/* Reversed rhythm: phone/media on the left, copy on the right (desktop). */
.split-grid.reverse .split-media { order: -1; }
.check-list {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}
.check-list li {
  position: relative;
  padding-left: 1.9rem;
  color: var(--ink);
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15rem;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 999px;
  background: var(--accent);
  /* checkmark */
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center / 70% no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center / 70% no-repeat;
}

/* ---- Feature grid -------------------------------------------------------- */
.features { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.features h2 { font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.8rem); }
.feature-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.3rem;
  box-shadow: var(--shadow-sm);
}
.feature h3 { font-size: 1.15rem; margin-bottom: 0.3rem; }
.feature p { color: var(--muted); margin: 0; font-size: 0.98rem; }

/* ---- Gallery ------------------------------------------------------------- */
.gallery-section { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.gallery-section h2 {
  font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.8rem);
  text-align: center;
}
.gallery {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
  justify-items: center;
}
.gallery figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}
.gallery figcaption { color: var(--muted); text-align: center; font-size: 0.98rem; }

/* ---- Mac screenshots ---------------------------------------------------- */
.mac-showcase { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.mac-showcase h2 { font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.8rem); }
.mac-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.2rem, 3vw, 2rem);
  margin-top: 2rem;
}
.mac-gallery figure { margin: 0; min-width: 0; }
.mac-gallery figcaption {
  color: var(--muted);
  text-align: center;
  margin-top: 0.8rem;
  font-size: 0.98rem;
}
/* Screenshots already carry their own macOS window chrome + shadow, so the
   container just holds the transparent PNG at its natural aspect ratio. */
.mac-shot { min-width: 0; }
.mac-shot picture { display: block; }
.mac-shot img {
  display: block;
  width: 100%;
  height: auto;
}
.mac-placeholder {
  border: 1px solid var(--line);
  border-radius: 1rem;
  min-height: clamp(14rem, 28vw, 21rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent-2) 11%, transparent), transparent 55%),
    repeating-linear-gradient(
      45deg,
      color-mix(in srgb, var(--accent) 6%, transparent) 0,
      color-mix(in srgb, var(--accent) 6%, transparent) 12px,
      transparent 12px,
      transparent 24px),
    var(--bg2);
}
.mac-placeholder strong { color: var(--ink); font-size: 1.2rem; }
.mac-placeholder span:last-child { font-size: 0.82rem; }

/* ---- Privacy ------------------------------------------------------------- */
.privacy { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.privacy-inner {
  text-align: center;
  max-width: 46rem;
  margin-inline: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  padding: clamp(1.8rem, 4vw, 3rem);
  box-shadow: var(--shadow);
}
.privacy h2 { font-size: clamp(1.7rem, 1.2rem + 2vw, 2.6rem); }
.privacy .section-lead { margin-inline: auto; }

/* ---- Closing ------------------------------------------------------------- */
.closing { padding-block: clamp(3rem, 7vw, 5rem); }
.closing-inner { text-align: center; }
.closing h2 {
  font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3rem);
  max-width: 32rem;
  margin-inline: auto;
}
.closing .section-lead { margin-inline: auto; }
.signup-form {
  width: min(100%, 35rem);
  margin: 1.75rem 0 0;
  scroll-margin-top: 5rem;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.form-trap { display: none; }
.signup-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}
.signup-controls input {
  flex: 1 1 13rem;
  min-width: 0;
  min-height: 3.25rem;
  border: 1px solid var(--line);
  border-radius: 0.875rem;
  padding: 0.75rem 1.15rem;
  background: var(--card);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}
.signup-controls .btn {
  flex: 0 0 auto;
  min-height: 3.25rem;
  border-radius: 0.875rem;
}
.signup-controls input::placeholder { color: var(--muted); opacity: 0.85; }
.form-note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

/* ---- Thank-you page ----------------------------------------------------- */
.thanks-page {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}
.thanks-main {
  display: grid;
  place-items: center;
  padding-block: clamp(4rem, 12vw, 8rem);
}
.thanks-card {
  width: min(36rem, 100%);
  text-align: center;
  padding: clamp(1.8rem, 5vw, 3rem);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  box-shadow: var(--shadow);
}
.thanks-card h1 { font-size: clamp(2rem, 1.3rem + 3vw, 3.2rem); }
.thanks-card .section-lead { margin-inline: auto; }
.thanks-icon {
  width: 5rem;
  height: 5rem;
  margin: 0 auto 1.3rem;
  border-radius: 1.2rem;
  box-shadow: var(--shadow-sm);
}

/* ---- Footer -------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
  color: var(--muted);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-inner p { margin: 0; }
.footer-note { font-size: 0.9rem; }
.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.github-link:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-2) 8%, transparent);
}
.github-link svg {
  width: 1.125rem;
  height: 1.125rem;
}

/* ---- Responsive ---------------------------------------------------------- */
@media (max-width: 42rem) {
  .hero-grid,
  .split-grid { grid-template-columns: 1fr; }
  .hero-device { order: -1; }
  .story-cards,
  .feature-grid,
  .gallery,
  .mac-gallery { grid-template-columns: 1fr; }
  .signup-controls { flex-direction: column; }
  .signup-controls input { flex-basis: auto; }
  .signup-controls .btn { width: 100%; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 42.01rem) and (max-width: 60rem) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---- Reduced motion ------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .memory { transition: none; transform: none; }
  .hero-shot { transition: none; }
  .btn { transition: none; }
}