/* AI Lingua landing — bilingual (FA + EN). Tokens mirror the in-app Compose theme.
   Source-of-truth: app/src/main/java/ir/ailingua/app/presentation/theme/{Color,Spacing,Typography,LinguaShape}.kt */

/* ---------- Fonts ---------- */
@font-face {
  font-family: "Vazirmatn";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/Vazirmatn-Regular.woff2") format("woff2");
}
@font-face {
  font-family: "Vazirmatn";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("assets/fonts/Vazirmatn-Medium.woff2") format("woff2");
}
@font-face {
  font-family: "Vazirmatn";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("assets/fonts/Vazirmatn-SemiBold.woff2") format("woff2");
}
@font-face {
  font-family: "Vazirmatn";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("assets/fonts/Vazirmatn-Bold.woff2") format("woff2");
}
@font-face {
  font-family: "Vazirmatn";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url("assets/fonts/Vazirmatn-ExtraBold.woff2") format("woff2");
}

/* ---------- Tokens (mirror in-app theme) ---------- */
:root {
  --color-primary: #399675;        /* LinguaGreen */
  --color-primary-on: #ffffff;
  --color-tertiary: #F2954E;       /* LinguaOrange */
  --color-tertiary-end: #FAD162;   /* LinguaYellow */
  --color-bg: #F4F4F4;
  --color-card: #FBFBFB;
  --color-text: #35383B;
  --color-muted: #707376;
  --color-border: #E5E5E5;

  --radius-button: 16px;
  --radius-card: 24px;
  --radius-xlarge: 30px;
  --radius-pill: 9999px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --page-h: 25px;
  --button-h: 60px;

  --font-body: "Vazirmatn", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --gradient-cover: linear-gradient(180deg, var(--color-tertiary) 0%, var(--color-tertiary-end) 100%);

  --shadow-card: 0 8px 24px rgba(37, 39, 38, 0.08);
  --shadow-button: 0 6px 16px rgba(57, 150, 117, 0.28);
}

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

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

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  /* Latin numerals stay Latin even inside RTL Persian content (mirrors in-app behavior). */
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Latin numerals everywhere, even in fa-IR (mirrors XP "100" in app). */
[lang="fa"] { unicode-bidi: plaintext; }

/* ---------- Layout helpers ---------- */
.container {
  width: min(1120px, 100% - calc(var(--page-h) * 2));
  margin-inline: auto;
}

section {
  padding-block: clamp(var(--space-xxl), 6vw, 80px);
}

/* ---------- Top nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 244, 244, 0.85);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.topnav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding-block: var(--space-md);
}
.topnav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  color: var(--color-text);
  font-size: 18px;
}
.topnav__brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}
.topnav__links {
  display: inline-flex;
  align-items: center;
  gap: var(--space-lg);
  font-size: 14px;
  font-weight: 600;
}
.topnav__links a { color: var(--color-muted); }
.topnav__links a:hover { color: var(--color-text); text-decoration: none; }
@media (max-width: 720px) {
  .topnav__links a:not(.lang-toggle) { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(40px, 8vw, 96px);
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(var(--space-xl), 5vw, 56px);
  align-items: center;
}
.hero__title {
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.18;
  margin: 0 0 var(--space-lg);
}
.hero__title .accent { color: var(--color-primary); }
.hero__lede {
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.6;
  color: var(--color-muted);
  margin: 0 0 var(--space-xl);
  max-width: 56ch;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* ---------- Buttons (in-app radius 16, height 60) ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  height: var(--button-h);
  padding-inline: var(--space-xl);
  border-radius: var(--radius-button);
  font-family: inherit;
  font-weight: 600;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; }

.btn--primary {
  background: var(--color-tertiary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(242, 149, 78, 0.28);
}
.btn--primary:hover { background: #e3854a; }

.btn--outline {
  background: #fff;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--outline:hover { border-color: var(--color-text); background: #fff; }

.btn--green {
  background: var(--color-primary);
  color: var(--color-primary-on);
  box-shadow: var(--shadow-button);
}
.btn--green:hover { background: #2f8466; }

.btn__sub {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: start;
  line-height: 1.1;
}
.btn__sub .small { font-size: 11px; font-weight: 500; opacity: 0.85; }
[dir="rtl"] .btn__sub { align-items: flex-start; text-align: start; }

/* ---------- Phone frame ---------- */
.phone {
  position: relative;
  width: min(320px, 80%);
  margin-inline: auto;
  aspect-ratio: 9 / 19;
  background: #1a1d20;
  border-radius: 36px;
  padding: 12px;
  box-shadow:
    0 24px 60px rgba(37, 39, 38, 0.18),
    0 4px 14px rgba(37, 39, 38, 0.08);
}
.phone::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: 92px;
  height: 22px;
  background: #1a1d20;
  border-radius: 999px;
  z-index: 2;
}
.phone__screen {
  width: 100%;
  height: 100%;
  border-radius: 26px;
  overflow: hidden;
  background: #fff;
}
.phone__screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- Section heading ---------- */
.section__head {
  text-align: center;
  margin-bottom: var(--space-xxl);
}
.section__eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-sm);
}
.section__title {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  margin: 0 0 var(--space-sm);
  line-height: 1.25;
}
.section__lede {
  color: var(--color-muted);
  margin: 0 auto;
  max-width: 64ch;
}

/* ---------- Why grid ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-lg);
}
.feature {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
}
.feature__icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--gradient-cover);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
}
.feature__icon svg { width: 28px; height: 28px; }
.feature__title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 var(--space-xs);
}
.feature__body {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.55;
}

@media (max-width: 980px) { .features { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .features { grid-template-columns: 1fr; } }

/* ---------- How it works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-xl);
  position: relative;
}
.steps::before {
  content: "";
  position: absolute;
  top: 30px;
  inset-inline-start: 12%;
  inset-inline-end: 12%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-tertiary), var(--color-primary));
  opacity: 0.35;
  border-radius: 2px;
  z-index: 0;
}
.step {
  position: relative;
  z-index: 1;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  text-align: center;
}
.step__num {
  width: 60px;
  height: 60px;
  border-radius: 999px;
  background: #fff;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: var(--space-md);
  box-shadow: 0 4px 12px rgba(57, 150, 117, 0.18);
}
.step__title { margin: 0 0 var(--space-xs); font-size: 17px; font-weight: 700; }
.step__body  { margin: 0; color: var(--color-muted); font-size: 14px; line-height: 1.55; }

@media (max-width: 760px) {
  .steps { grid-template-columns: 1fr; }
  .steps::before { display: none; }
}

/* ---------- Daily missions CTA pill ---------- */
.mission-cta {
  background: linear-gradient(135deg, #FFF7EE 0%, #F4F4F4 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xlarge);
  padding: clamp(var(--space-xl), 5vw, 56px);
  text-align: center;
}
.mission-cta__pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  height: var(--button-h);
  padding-inline: var(--space-xxl);
  border-radius: var(--radius-button);
  background: var(--color-primary);
  color: var(--color-primary-on);
  font-weight: 600;
  font-size: 16px;
  box-shadow: var(--shadow-button);
  margin-bottom: var(--space-xl);
}
.mission-cta__pill .dot {
  width: 8px; height: 8px;
  background: #fff; border-radius: 50%;
  opacity: 0.9;
}
.mission-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-lg);
  text-align: start;
}
.mission-list li {
  background: #fff;
  border-radius: var(--radius-card);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text);
}
.mission-list strong { color: var(--color-primary); display: block; margin-bottom: var(--space-xs); font-weight: 700; }

@media (max-width: 760px) { .mission-list { grid-template-columns: 1fr; } }

/* ---------- Screenshots strip ---------- */
.shots {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-xl);
  align-items: end;
}
.shots .phone { width: 100%; max-width: 280px; }
@media (max-width: 880px) {
  .shots {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: var(--space-lg);
    padding-bottom: var(--space-md);
    -webkit-overflow-scrolling: touch;
  }
  .shots .phone {
    flex: 0 0 64%;
    scroll-snap-align: center;
  }
}

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin-inline: auto; }
.faq details {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-md);
  transition: box-shadow 120ms ease;
}
.faq details[open] { box-shadow: var(--shadow-card); }
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  gap: var(--space-md);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-weight: 700;
  font-size: 22px;
  color: var(--color-primary);
  transition: transform 180ms ease;
  line-height: 1;
}
.faq details[open] summary::after { content: "−"; }
.faq p {
  margin: var(--space-md) 0 0;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
  background: #fff;
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-xxl);
  margin-top: var(--space-xxl);
}
.footer__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}
.footer__links {
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  font-size: 14px;
  color: var(--color-muted);
}
.footer__links a { color: var(--color-muted); }
.footer__links a:hover { color: var(--color-text); }
.footer__attrib {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: var(--space-md);
  text-align: center;
  width: 100%;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text);
  font-weight: 600;
  font-size: 13px;
}
.lang-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); text-decoration: none; }

/* ---------- Hero responsive collapse ---------- */
@media (max-width: 880px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__media { order: 2; }
  .hero__copy  { order: 1; text-align: center; }
  .hero__lede  { margin-inline: auto; }
  .hero__cta   { justify-content: center; }
}

/* ---------- Privacy / terms stubs ---------- */
.legal {
  max-width: 720px;
  margin-inline: auto;
  padding-block: clamp(var(--space-xxl), 8vw, 96px);
}
.legal h1 { font-size: 28px; font-weight: 800; margin: 0 0 var(--space-md); }
.legal p { color: var(--color-muted); line-height: 1.7; }