/* Britti Sans (Alt cut) — the app's typeface. The bundled files are the trial version and cover
   Latin only: Azerbaijani letters (ə, ş, ğ, ı, ç, ö, ü) fall back to Inter until the full licensed
   family is bought. Same trade-off as in the app. */

@font-face {
  font-family: "Britti Sans";
  src: url("/assets/fonts/BrittiSansAlt-Light.otf") format("opentype");
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Britti Sans";
  src: url("/assets/fonts/BrittiSansAlt-Regular.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Britti Sans";
  src: url("/assets/fonts/BrittiSansAlt-Regular-Italic.otf") format("opentype");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: "Britti Sans";
  src: url("/assets/fonts/BrittiSansAlt-Semibold.otf") format("opentype");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Britti Sans";
  src: url("/assets/fonts/BrittiSansAlt-Bold.otf") format("opentype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Britti Sans";
  src: url("/assets/fonts/BrittiSansAlt-Bold-Italic.otf") format("opentype");
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}

/* Lernify — marketing site. The tokens mirror the app's Theme (Client/Lernify/Support/Theme.swift). */

:root {
  --blue: #233dff;
  --blue-soft: #4358ff;
  --lime: #c1ff72;
  --bg: #0d1017;
  --bg-raised: #141925;
  --card: #1e2332;
  --hairline: rgba(255, 255, 255, 0.08);
  --text: #ffffff;
  --text-2: rgba(255, 255, 255, 0.66);
  --text-3: rgba(255, 255, 255, 0.42);
  --on-blue: #ffffff;
  --on-blue-2: rgba(255, 255, 255, 0.72);
  --on-lime: #101010;
  --radius-card: 24px;
  --radius-brand: 32px;
  --radius-pill: 999px;
  --shell: 1120px;
  --font: "Britti Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

.shell {
  width: min(100% - 40px, var(--shell));
  margin-inline: auto;
}

/* Type -------------------------------------------------------------------- */

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.04;
  font-weight: 700;
}

h1 {
  font-size: clamp(42px, 7vw, 76px);
}

h2 {
  font-size: clamp(32px, 4.4vw, 46px);
}

h3 {
  font-size: 21px;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

p {
  margin: 0;
}

.accent {
  color: var(--lime);
  font-style: italic;
  font-weight: 700;
}

.accent-blue {
  color: var(--blue-soft);
  font-style: italic;
}

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-3);
}

.eyebrow--lime {
  color: var(--lime);
}

.lead {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text-2);
  max-width: 54ch;
}

/* Chrome ------------------------------------------------------------------ */

.wordmark {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 14px 0;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.nav--scrolled {
  border-bottom-color: var(--hairline);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav__links {
  display: flex;
  gap: 24px;
  margin-left: auto;
  font-size: 15px;
  color: var(--text-2);
}

.nav__links a:hover {
  color: var(--text);
}

.lang {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  background: var(--bg-raised);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
}

.lang a[aria-current="true"] {
  color: var(--lime);
}

/* Buttons ----------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 28px;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn--blue {
  background: var(--blue);
  color: var(--on-blue);
}

.btn--blue:hover {
  filter: brightness(1.12);
}

.btn--lime {
  background: var(--lime);
  color: var(--on-lime);
}

.btn--lime:hover {
  filter: brightness(1.06);
}

.btn--ghost {
  border-color: var(--hairline);
  color: var(--text-2);
}

.btn--ghost:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

/* App Store badge — no link until the app is published. */
.store {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 22px 12px 18px;
  border-radius: 16px;
  border: 1px solid var(--hairline);
  background: var(--bg-raised);
  cursor: default;
}

.store svg {
  width: 26px;
  height: 26px;
  fill: var(--text);
  flex: none;
}

.store__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.store__top {
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

.store__bottom {
  font-size: 17px;
  font-weight: 600;
}

/* Hero -------------------------------------------------------------------- */

.hero {
  position: relative;
  padding: clamp(60px, 9vw, 120px) 0 clamp(60px, 8vw, 110px);
  overflow: hidden;
}

/* The app's "ecliptic" ring, approximated with slowly drifting blurred blobs. The layer is fixed
   behind the whole page: strongest behind the hero, then it fades as you scroll, so the lower
   sections keep a faint tint of it instead of ending on flat color. */
.page-glow {
  position: fixed;
  inset: -15% -10% -10%;
  z-index: -1;
  pointer-events: none;
  filter: blur(110px);
  opacity: var(--glow, 0.55);
  transition: opacity 0.25s linear;
}

.page-glow span {
  position: absolute;
  display: block;
  border-radius: 50%;
}

.page-glow span:nth-child(1) {
  width: 46vw;
  height: 46vw;
  left: 2%;
  top: 6%;
  background: var(--blue);
  animation: drift 26s ease-in-out infinite alternate;
}

.page-glow span:nth-child(2) {
  width: 38vw;
  height: 38vw;
  right: 6%;
  top: 0%;
  background: var(--lime);
  opacity: 0.55;
  animation: drift 32s ease-in-out infinite alternate-reverse;
}

.page-glow span:nth-child(3) {
  width: 32vw;
  height: 32vw;
  left: 34%;
  bottom: -6%;
  background: var(--blue-soft);
  opacity: 0.5;
  animation: drift 38s ease-in-out infinite alternate;
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(60px, 50px, 0) scale(1.15);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-glow span {
    animation: none;
  }
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.hero__copy > * + * {
  margin-top: 22px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.hero__note {
  font-size: 14px;
  color: var(--text-3);
}

/* Phone ------------------------------------------------------------------- */

/* An iPhone the screenshots sit inside: titanium edge, black bezel, dynamic island. */
.phone {
  position: relative;
  border-radius: 54px;
  padding: 11px;
  background: linear-gradient(150deg, #5b6170 0%, #2a2e38 18%, #14161c 52%, #3b404c 84%, #1a1d24 100%);
  box-shadow:
    0 40px 90px rgba(0, 0, 0, 0.55),
    inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.phone img {
  border-radius: 43px;
  width: 100%;
  background: #000;
}

/* Dynamic island */
.phone::after {
  content: "";
  position: absolute;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: 27%;
  height: 26px;
  border-radius: var(--radius-pill);
  background: #05070b;
  z-index: 2;
}

/* Side buttons */
.phone::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 21%;
  width: 3px;
  height: 9%;
  border-radius: 2px;
  background: linear-gradient(180deg, #5b6170, #2a2e38);
  box-shadow: 0 8% 0 0 transparent;
}

.screens .phone::after {
  top: 15px;
  height: 17px;
}

.phone--tilt {
  transform: rotate(-2.5deg);
}

/* Sections ---------------------------------------------------------------- */

section {
  padding: clamp(64px, 8vw, 110px) 0;
}

.section__head {
  max-width: 60ch;
}

.section__head > * + * {
  margin-top: 14px;
}

.grid {
  display: grid;
  gap: 20px;
  margin-top: 44px;
}

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

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

.card {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: 28px;
}

.card > * + * {
  margin-top: 12px;
}

.card__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--lime);
  font-weight: 700;
  font-size: 15px;
}

.card p {
  color: var(--text-2);
  font-size: 16px;
}

.card--brand {
  background: var(--blue);
  border-color: transparent;
  border-radius: var(--radius-brand);
  padding: clamp(28px, 4vw, 44px);
}

.card--brand h3,
.card--brand h2 {
  color: var(--on-blue);
}

.card--brand p {
  color: var(--on-blue-2);
}

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.feature + .feature {
  margin-top: clamp(48px, 6vw, 90px);
}

.feature--flip .feature__media {
  order: -1;
}

.feature__copy > * + * {
  margin-top: 16px;
}

.ladder {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.rung {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 20px;
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--hairline);
}

.rung__index {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--lime);
}

.rung__title {
  font-weight: 600;
}

.rung__sub {
  font-size: 14px;
  color: var(--text-3);
}

.rung--soon {
  opacity: 0.62;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.chip {
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--hairline);
  font-size: 14px;
  color: var(--text-2);
}

/* Screens strip ----------------------------------------------------------- */

.screens {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 44px;
}

.screens figure {
  margin: 0;
}

.screens figcaption {
  margin-top: 14px;
  font-size: 14px;
  color: var(--text-3);
  text-align: center;
}

.screens .phone {
  border-radius: 38px;
  padding: 7px;
}

.screens .phone img {
  border-radius: 31px;
}

/* FAQ --------------------------------------------------------------------- */

.faq {
  margin-top: 36px;
  border-top: 1px solid var(--hairline);
}

.faq details {
  border-bottom: 1px solid var(--hairline);
}

.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 0;
  font-size: 18px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  color: var(--lime);
  font-weight: 400;
  font-size: 24px;
  line-height: 1;
}

.faq details[open] summary::after {
  content: "–";
}

.faq p {
  color: var(--text-2);
  padding-bottom: 22px;
  max-width: 70ch;
}

/* CTA + footer ------------------------------------------------------------ */

.cta {
  text-align: center;
}

.cta .card--brand > * + * {
  margin-top: 18px;
}

.cta .lead {
  margin-inline: auto;
}

.cta__actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

footer {
  border-top: 1px solid var(--hairline);
  padding: 44px 0 60px;
  color: var(--text-3);
  font-size: 14px;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  align-items: center;
}

.footer__links {
  display: flex;
  gap: 22px;
  margin-left: auto;
  flex-wrap: wrap;
}

.footer__links a:hover {
  color: var(--text);
}

/* Legal pages ------------------------------------------------------------- */

.prose {
  max-width: 72ch;
  padding: clamp(48px, 7vw, 90px) 0;
}

.prose > * + * {
  margin-top: 18px;
}

.prose h2 {
  font-size: 24px;
  margin-top: 40px;
}

.prose p,
.prose li {
  color: var(--text-2);
  font-size: 16px;
}

.prose ul {
  padding-left: 20px;
  margin: 0;
}

.prose li + li {
  margin-top: 8px;
}

.prose a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Responsive -------------------------------------------------------------- */

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

  .feature--flip .feature__media {
    order: 0;
  }

  .hero__media {
    max-width: 340px;
  }

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

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

  .nav__links {
    display: none;
  }
}

/* Phones inside feature rows stay modest, so the page doesn't turn into a mile of screenshots. */
.feature__media .phone,
.hero__media .phone {
  max-width: 330px;
  margin-inline: auto;
}

/* Light mode ---------------------------------------------------------------
   Mirrors the app's light theme: ink on off-white, white cards, blue as the accent (lime stays on
   the blue surfaces, where it is readable).

   The switch in the header writes `data-theme` on <html>, and the script there sets it on load from
   the stored choice or the system setting. The media query below is the no-script fallback. */

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
  --bg: #f6f4f9;
    --bg-raised: #ffffff;
    --card: #ffffff;
    --hairline: rgba(18, 15, 23, 0.1);
    --text: #120f17;
    --text-2: rgba(18, 15, 23, 0.62);
    --text-3: rgba(18, 15, 23, 0.45);
  }
}

:root[data-theme="light"] {
  --bg: #f6f4f9;
  --bg-raised: #ffffff;
  --card: #ffffff;
  --hairline: rgba(18, 15, 23, 0.1);
  --text: #120f17;
  --text-2: rgba(18, 15, 23, 0.62);
  --text-3: rgba(18, 15, 23, 0.45);
}

:root[data-theme="light"] .wordmark,
:root[data-theme="light"] .accent,
:root[data-theme="light"] .card__num,
:root[data-theme="light"] .rung__index,
:root[data-theme="light"] .eyebrow--lime,
:root[data-theme="light"] .prose a,
:root[data-theme="light"] .lang a[aria-current="true"],
:root[data-theme="light"] .faq summary::after {
  color: var(--blue);
}

:root[data-theme="light"] .card--brand .eyebrow--lime {
  color: var(--lime);
}

:root[data-theme="light"] .card__num {
  background: rgba(35, 61, 255, 0.08);
}

:root[data-theme="light"] .card {
  box-shadow: 0 1px 2px rgba(18, 15, 23, 0.04), 0 12px 32px rgba(18, 15, 23, 0.05);
}

:root[data-theme="light"] .rung,
:root[data-theme="light"] .chip,
:root[data-theme="light"] .store {
  background: #ffffff;
}

:root[data-theme="light"] .page-glow {
  filter: blur(130px);
}

:root[data-theme="light"] .phone {
  background: linear-gradient(160deg, rgba(18, 15, 23, 0.14), rgba(18, 15, 23, 0.06));
  box-shadow: 0 30px 70px rgba(18, 15, 23, 0.18);
}

:root[data-theme="light"] .btn--ghost {
  border-color: rgba(18, 15, 23, 0.18);
}

/* Screenshots ----------------------------------------------------------------
   The phones always carry the opposite appearance of the page: a dark page shows the app in light
   mode and the other way round, so the screenshots stand out instead of blending into the section. */

.shot--app-dark {
  display: none;
}

:root[data-theme="light"] .shot--app-dark {
  display: block;
}

:root[data-theme="light"] .shot--app-light {
  display: none;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .shot--app-dark {
    display: block;
  }

  :root:not([data-theme]) .shot--app-light {
    display: none;
  }
}

/* Theme switch ---------------------------------------------------------------- */

.theme {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  background: var(--bg-raised);
  color: var(--text-2);
  cursor: pointer;
  padding: 0;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.theme:hover {
  color: var(--text);
}

.theme svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.theme .theme__moon {
  display: none;
}

:root[data-theme="light"] .theme .theme__moon {
  display: block;
}

:root[data-theme="light"] .theme .theme__sun {
  display: none;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .theme .theme__moon {
    display: block;
  }

  :root:not([data-theme]) .theme .theme__sun {
    display: none;
  }
}

/* Mascot ----------------------------------------------------------------------- */

.mascot {
  width: 84px;
  height: 84px;
  flex: none;
}

.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.cta .mascot {
  width: 120px;
  height: 120px;
  margin: 0 auto;
}

.hero__mascot {
  position: absolute;
  right: -8px;
  bottom: 18px;
  width: 116px;
  height: 116px;
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.45));
  animation: bob 5s ease-in-out infinite alternate;
}

@keyframes bob {
  from {
    transform: translateY(0) rotate(-3deg);
  }
  to {
    transform: translateY(-14px) rotate(3deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero__mascot {
    animation: none;
  }
}

@media (max-width: 900px) {
  .hero__mascot {
    width: 84px;
    height: 84px;
    right: 0;
  }
}

/* Lime closing card — the inverse of the blue one: dark text on lime, blue call to action. */

.card--lime {
  background: var(--lime);
  border-color: transparent;
  border-radius: var(--radius-brand);
  padding: clamp(28px, 4vw, 44px);
}

.card--lime h2,
.card--lime h3 {
  color: var(--on-lime);
}

.card--lime .eyebrow {
  color: rgba(16, 16, 16, 0.55);
}

.card--lime .lead,
.card--lime p {
  color: rgba(16, 16, 16, 0.72);
}

.card--lime .btn--blue {
  background: var(--blue);
  color: #ffffff;
}

.card--lime .btn--ink {
  border-color: rgba(16, 16, 16, 0.3);
  color: var(--on-lime);
}

.card--lime .btn--ink:hover {
  border-color: rgba(16, 16, 16, 0.55);
  color: var(--on-lime);
}