:root {
  --bg: #050815;
  --bg-alt: #080b1f;
  --bg-elevated: #111827;
  --border-subtle: rgba(148, 163, 184, 0.25);
  --text: #e5e7eb;
  --text-soft: #b4b9c2;
  --accent: #7c3aed;
  --accent-soft: rgba(124, 58, 237, 0.2);
  --accent-secondary: #22d3ee;
  --danger: #f97373;
  --pill-bg: rgba(15, 23, 42, 0.9);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-pill: 999px;
  --shadow-soft: 0 32px 80px rgba(15, 23, 42, 0.8);
  --shadow-subtle: 0 18px 40px rgba(15, 23, 42, 0.6);
  --shadow-pill: 0 18px 40px rgba(15, 23, 42, 0.7);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #1f2937 0, #020617 55%, #000 100%);
  -webkit-font-smoothing: antialiased;
}

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

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

main {
  display: block;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(20px);
  background: linear-gradient(
    to bottom,
    rgba(2, 6, 23, 0.95),
    rgba(2, 6, 23, 0.7),
    transparent
  );
  border-bottom: 1px solid rgba(31, 41, 55, 0.7);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 40%;
  display: block;
  object-fit: contain;
  box-shadow: var(--shadow-pill);
}

.brand-text {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  font-size: 0.95rem;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-soft);
}

.main-nav a {
  position: relative;
  padding-bottom: 0.1rem;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.1rem;
  width: 0;
  height: 2px;
  background: linear-gradient(to right, #22d3ee, #7c3aed);
  border-radius: 999px;
  transition: width 0.18s ease-out;
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  width: 100%;
}

.header-cta {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-end;
  gap: 0.8rem;
}

.header-countdown {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
  font-family: "Space Grotesk", system-ui, sans-serif;
  color: #e5e7eb;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.55);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.6rem;
  opacity: 0.75;
  transform: scale(0.92);
}

.header-countdown-title {
  font-size: 0.5rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.header-countdown-value {
  font-size: 1.0rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.3rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.15s ease-out, box-shadow 0.15s ease-out,
    background 0.15s ease-out, border-color 0.15s ease-out, color 0.15s ease-out;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #22d3ee, #6366f1, #7c3aed);
  color: #020617;
  box-shadow: var(--shadow-subtle);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 26px 55px rgba(15, 23, 42, 0.9);
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(148, 163, 184, 0.4);
  color: var(--text-soft);
}

.btn-secondary:hover {
  border-color: rgba(209, 213, 219, 0.7);
  color: #e5e7eb;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(148, 163, 184, 0.5);
  color: var(--text-soft);
}

.btn-ghost:hover {
  border-color: #c4b5fd;
  color: #e5e7eb;
}

.hero {
  padding: 5rem 0 4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.1fr);
  gap: 3.5rem;
  align-items: center;
}

.hero-text h1 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: clamp(2.8rem, 5vw, 3.6rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  letter-spacing: -0.04em;
}

.hero-copy {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-soft);
  max-width: 32rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
  color: #a5b4fc;
  margin: 0 0 0.85rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.8rem 0 0.75rem;
}

.cta-note {
  font-size: 0.8rem;
  color: var(--text-soft);
  margin: 0;
}

.hero-meta {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pill {
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-pill);
  background: var(--pill-bg);
  color: var(--text-soft);
  font-size: 0.6rem;
  border: 1px solid rgba(148, 163, 184, 0.22);
}

.hero-copy .pill {
  margin-left: 0.5rem;
  vertical-align: middle;
}

.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}

.ear-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-bottom: 0.5rem;
  position: relative;
}

.ear-streams {
  transition: opacity 0.15s ease-out, transform 0.3s ease-out;
}

.ear-streams.is-fading {
  opacity: 0;
}

/* Option C: slide animation */
.ear-streams.slide-left-out {
  transform: translateX(100%);
}

.ear-streams.slide-right-out {
  transform: translateX(-100%);
}

.ear-streams.slide-from-left {
  transform: translateX(-100%);
}

.ear-streams.slide-from-right {
  transform: translateX(100%);
}

.ear-swap-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-soft);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: color 0.15s ease-out, background 0.15s ease-out, transform 0.15s ease-out;
}

.ear-swap-btn:hover {
  color: #e5e7eb;
  background: rgba(30, 41, 59, 0.9);
}

.ear-swap-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Inline icon next to text (e.g. in hero-copy) */
.ear-swap-btn-container {
  display: inline-flex;
  align-items: center;
  vertical-align: middle;
  margin: 0 0.15em;
}

.ear-swap-btn-container .ear-swap-btn {
  position: static;
  transform: none;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
}

.ear-swap-btn-container .ear-swap-icon {
  width: 0.9rem;
  height: 0.9rem;
}

.ear-swap-icon {
  width: 1.25rem;
  height: 1.25rem;
  display: block;
  flex-shrink: 0;
  pointer-events: none;
}

.ear {
  position: relative;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: radial-gradient(circle at top left, #0b1120, #020617 60%);
  overflow: hidden;
}

.ear {
  animation: earPulse 4s ease-in-out infinite;
}

@keyframes earPulse {
  0% {
    box-shadow: 0 0 0px rgba(255, 255, 255, 0.0);
    transform: scale(1);
  }

  40% {
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.25);
  }

  60% {
    box-shadow: 0 0 16px rgba(255, 255, 255, 0.35);
    transform: scale(1.0); /* subtle expansion */
  }

  100% {
    box-shadow: 0 0 0px rgba(255, 255, 255, 0.0);
    transform: scale(1);
  }
}

.ear-left {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.3), #020617 55%);
}

.ear-right {
  background: radial-gradient(circle at top right, rgba(167, 139, 250, 0.3), #020617 55%);
}

.ear-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
  margin-bottom: 0.3rem;
}

.ear-stream {
  font-size: 0.9rem;
  font-weight: 500;
}

.swap-button {
  width: auto;
  margin: -1.75rem auto 0.8rem;
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius-pill);
  border: none;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  background: radial-gradient(
    circle at left,
    rgba(56, 189, 248, 0.7),
    rgba(129, 140, 248, 0.9),
    rgba(147, 51, 234, 0.95)
  );
  color: #020617;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.9);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.swap-button:hover {
  transform: translateY(-1px);
}

.section {
  padding: 4.5rem 0;
}

.section-alt {
  background: radial-gradient(circle at top, #020617 0, #020617 55%, #000 100%);
}

.section-header {
  text-align: left;
  max-width: 40rem;
  margin-bottom: 2rem;
}

.section-header h2 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: 1.8rem;
  margin: 0 0 0.7rem;
  letter-spacing: -0.03em;
}

.section-lead {
  margin: 0;
  font-size: 0.98rem;
  color: var(--text-soft);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.step-card {
  padding: 1.4rem 1.35rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: radial-gradient(circle at top left, #020617, #020617 60%);
  box-shadow: var(--shadow-subtle);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.16);
  font-size: 0.8rem;
  margin-bottom: 0.8rem;
}

.step-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
}

.step-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.benefits-grid,
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.3rem;
}

.benefit-card,
.usecase-card {
  background: rgba(15, 23, 42, 0.9);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.4rem 1.5rem;
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.benefit-card h3,
.usecase-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.benefit-card p,
.usecase-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.screenshots-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.3rem;
  margin-top: 1.8rem;
}

.screenshot-frame {
  border-radius: 30px;
  padding: 0.75rem;
  background: radial-gradient(circle at top, #111827, #020617 70%);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: var(--shadow-subtle);
}

.screenshot-frame img {
  border-radius: 20px;
  border: 1px solid rgba(15, 23, 42, 0.7);
}

.screenshot-frame figcaption {
  margin-top: 0.6rem;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.screenshots-note {
  margin-top: 1.2rem;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.tutorials-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4rem;
}

.tutorial-card {
  background: rgba(15, 23, 42, 0.93);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.4);
  padding: 1.3rem 1.3rem 1.6rem;
}

.video-placeholder {
  border-radius: 18px;
  padding: 2.6rem 1.2rem;
  border: 1px dashed rgba(148, 163, 184, 0.5);
  background: radial-gradient(circle at top left, rgba(124, 58, 237, 0.2), #020617);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: #e5e7eb;
  text-align: center;
  margin-bottom: 1rem;
}

.video-placeholder:is(video) {
  width: 100%;
  height: auto;
  padding: 0;
  display: block;
  border-style: solid;
}

.tutorial-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.tutorial-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.science-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.1fr);
  gap: 1.8rem;
  font-size: 0.95rem;
  color: var(--text-soft);
}

.legal-main {
  min-height: 100vh;
  padding: 4rem 0 3rem;
  display: flex;
}

.legal-container {
  max-width: 720px;
}

.legal-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-soft);
  margin-bottom: 1.5rem;
}

.legal-back-link:hover {
  color: #e5e7eb;
}

.legal-header {
  margin-bottom: 2rem;
}

.legal-header h1 {
  margin: 0 0 0.3rem;
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: 1.8rem;
  letter-spacing: -0.03em;
}

.legal-meta {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-soft);
}

.legal-section {
  margin-bottom: 1.6rem;
}

.legal-section h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.legal-section p,
.legal-section ul {
  font-size: 0.94rem;
  color: var(--text-soft);
}

.back-story {
  margin-bottom: 1.6rem;
}

.back-story h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.back-story p,
.back-story ul {
  font-size: 1.2rem;
  color: var(--text-soft);
}

.mailing-page .legal-header .eyebrow {
  margin-bottom: 0.75rem;
}

.mailing-form {
  max-width: 28rem;
  padding: 1.75rem 1.5rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.75);
  box-shadow: var(--shadow-subtle);
}

.form-field {
  margin-bottom: 1.25rem;
}

.form-field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 0.45rem;
}

.form-optional {
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
  color: rgba(148, 163, 184, 0.85);
}

.mailing-form input[type="email"],
.mailing-form textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: rgba(2, 6, 23, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease-out, box-shadow 0.15s ease-out;
}

.mailing-form input[type="email"]::placeholder,
.mailing-form textarea::placeholder {
  color: rgba(148, 163, 184, 0.55);
}

.mailing-form input[type="email"]:focus,
.mailing-form textarea:focus {
  outline: none;
  border-color: rgba(167, 139, 250, 0.65);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.mailing-form textarea {
  resize: vertical;
  min-height: 6rem;
  line-height: 1.5;
}

.mailing-form-submit {
  width: 100%;
  margin-top: 0.25rem;
}

.mailing-form-note {
  margin: 1rem 0 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--text-soft);
}

.footer-cta {
  padding: 3.5rem 0;
  text-align: center;
  background: radial-gradient(circle at center, rgba(15, 23, 42, 0.6) 0%, transparent 70%);
  border-top: 1px solid rgba(31, 41, 55, 0.6);
}

.footer-cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.footer-cta-logo {
  width: 56px;
  height: 56px;
  object-fit: contain;
  display: block;
}

.footer-cta-heading {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-soft);
  letter-spacing: 0.02em;
}

.footer-cta-buttons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.site-footer {
  padding: 2.5rem 0 2.7rem;
  border-top: 1px solid rgba(31, 41, 55, 0.9);
  background: radial-gradient(circle at top, #020617, #000 60%);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links {
  display: flex;
  gap: 1.4rem;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.footer-links a:hover {
  color: #e5e7eb;
}

.footer-meta {
  width: 100%;
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-soft);
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-visual {
    order: -1;
  }

  .phone-mock,
  .ear-caption {
    margin-left: 0;
  }

  .header-inner {
    gap: 0.8rem;
  }

  .main-nav {
    display: none;
  }

  .steps-grid,
  .benefits-grid,
  .usecases-grid,
  .screenshots-row,
  .tutorials-grid,
  .science-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .section {
    padding: 3.5rem 0;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 1.2rem;
  }

  .hero {
    padding: 6rem 0 5rem;
    }

  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-cta-buttons {
    flex-direction: column;
  }

  .footer-inner {
    align-items: flex-start;
  }

  .footer-links {
    flex-wrap: wrap;
  }
}