@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@400;500;600&display=swap');

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; cursor: pointer; }

/* ---------- Tokens ---------- */
:root {
  --blue:        #4A90D9;
  --blue-light:  #EAF4FF;
  --blue-mid:    #BDD9F5;
  --blue-dark:   #2266A8;
  --green:       #34C759;
  --amber:       #FFB800;
  --red:         #FF4444;
  --navy:        #0F1E2E;
  --gray:        #6B7A8D;
  --gray-light:  #F0F4F8;
  --white:       #FFFFFF;
  --bg:          #FAFCFF;
  --border:      #DDE8F5;

  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(15, 30, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 30, 46, 0.10);
  --shadow-lg: 0 16px 48px rgba(15, 30, 46, 0.14);
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--navy);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  margin: 0 0 0.5em;
}

p { margin: 0 0 1em; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Accessibility ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--navy);
  color: var(--white);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 16px;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Language system ---------- */
[data-lang] { display: none; }
li[data-lang].active { display: list-item; }
span[data-lang].active,
a[data-lang].active,
label[data-lang].active,
cite[data-lang].active,
strong[data-lang].active { display: inline; }
div[data-lang].active,
p[data-lang].active,
h1[data-lang].active,
h2[data-lang].active,
h3[data-lang].active,
h4[data-lang].active,
blockquote[data-lang].active { display: block; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 252, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1120px;
  margin: 0 auto;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--navy);
}

.nav__logo-icon { font-size: 1.4rem; }

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--gray);
  transition: color 0.15s ease;
}

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

.nav__actions { display: flex; align-items: center; gap: 16px; }

@media (max-width: 900px) {
  .nav__links { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--blue);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover {
  background: var(--blue-dark);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}
.btn--outline:hover {
  background: var(--blue-light);
}

.btn--ghost {
  background: transparent;
  color: var(--navy);
  border-color: var(--border);
}
.btn--ghost:hover {
  background: var(--gray-light);
}

.btn--sm { padding: 9px 18px; font-size: 0.85rem; }
.btn--block { width: 100%; }

/* ---------- Section label ---------- */
.label {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue-dark);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

/* ---------- Sections ---------- */
section { padding: 96px 0; }
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}
.section-head h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
.section-head p { color: var(--gray); font-size: 1.05rem; }

@media (max-width: 640px) {
  section { padding: 64px 0; }
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, #EAF4FF 0%, #FAFCFF 60%);
  padding: 72px 0 64px;
}

.hero__content {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.hero__content h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero__content h1 .accent { color: var(--blue); }

.hero__content p.hero__subtext {
  font-size: 1.15rem;
  color: var(--gray);
  max-width: 620px;
  margin: 0 auto 32px;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.appstore-badge img { height: 52px; }

.hero__meta {
  font-size: 0.85rem;
  color: var(--gray);
}

/* ---------- Mascot showcase ---------- */
.mascot-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 760px;
  margin: 56px auto 0;
  padding: 40px 32px 32px;
}

.mascot-row {
  display: flex;
  align-items: center;
  justify-content: center;
}

.mascot-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.mascot-drop {
  width: 56px;
  height: 64px;
  border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  cursor: pointer;
  transition: transform 0.2s ease;
}
.mascot-drop:hover { transform: scale(1.12) translateY(-4px); }

.mascot-1 { background: linear-gradient(160deg, #b6bcc2, #7c8690); }
.mascot-2 { background: linear-gradient(160deg, #9eafc0, #6a8099); }
.mascot-3 { background: linear-gradient(160deg, #79acd4, #4a7eaa); }
.mascot-4 { background: linear-gradient(160deg, #5aaae0, #2d7dc4); }
.mascot-5 {
  background: linear-gradient(160deg, #4ac9ff, #2a90e8);
  box-shadow: 0 0 24px rgba(74, 201, 255, 0.6);
}

.mascot-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gray);
  text-align: center;
}

.mascot-line {
  height: 2px;
  flex: 1;
  min-width: 16px;
  margin: 0 4px 30px;
}
.mascot-line-1 { background: linear-gradient(90deg, #FF4444, #FFB800); }
.mascot-line-2 { background: linear-gradient(90deg, #FFB800, #4A90D9); }
.mascot-line-3 { background: linear-gradient(90deg, #4A90D9, #34C759); }
.mascot-line-4 { background: linear-gradient(90deg, #34C759, #30D158); }

#mascot-status {
  text-align: center;
  margin: 24px 0 0;
  font-weight: 600;
  color: var(--navy);
}

@media (max-width: 640px) {
  .mascot-drop { width: 40px; height: 46px; font-size: 1.1rem; }
  .mascot-card { padding: 28px 16px 24px; }
}

/* ---------- Screenshots ---------- */
.screens {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 56px;
}
.screens img {
  width: 220px;
  border-radius: 28px;
  box-shadow: var(--shadow-lg);
  border: 6px solid var(--navy);
}

/* ---------- Stats ---------- */
.stats { background: var(--gray-light); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  text-align: center;
}
.stat__number {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--blue);
}
.stat__desc { color: var(--gray); margin: 8px 0 4px; }
.stat__source { font-size: 0.8rem; color: var(--gray); opacity: 0.8; }

@media (max-width: 640px) {
  .stats-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* ---------- Grids ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; gap: 48px; }
}
@media (max-width: 640px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
}

/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.card__icon { font-size: 2rem; margin-bottom: 14px; }
.card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.card p { color: var(--gray); font-size: 0.95rem; margin: 0; }

/* ---------- Science ---------- */
.science { background: var(--blue-light); }
.science-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 28px;
  border-left: 4px solid var(--blue);
  box-shadow: var(--shadow-sm);
}
.science-card--green { border-left-color: var(--green); }
.science-card--amber { border-left-color: var(--amber); }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--blue-light);
  color: var(--blue-dark);
  margin-bottom: 12px;
}
.tag--green { background: #E4F9E9; color: #1F8A3D; }
.tag--amber { background: #FFF4D9; color: #966B00; }

.science-card blockquote {
  margin: 0 0 12px;
  font-size: 1rem;
  font-style: italic;
  color: var(--navy);
}
.science-card cite {
  font-size: 0.8rem;
  color: var(--gray);
  font-style: normal;
}

/* ---------- Problem / Solution ---------- */
.problem-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: #FFF1F1;
  margin-bottom: 10px;
  font-weight: 600;
}
.problem-row .emoji { font-size: 1.3rem; }

.solution-divider {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 20px 0;
}

.solution-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: #EAFBEF;
  font-weight: 700;
  color: #1F8A3D;
}
.solution-row .emoji { font-size: 1.3rem; }

/* ---------- Pricing ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.price-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
}

.price-card--highlight {
  border: 2px solid var(--blue);
  box-shadow: var(--shadow-md);
}

.price-card__ribbon {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--blue);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 5px 12px;
  border-radius: 999px;
}

.price-card h3 {
  font-size: 1.1rem;
  color: var(--gray);
  margin-bottom: 16px;
}

.price-card__amount {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
}
.price-card__period {
  color: var(--gray);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.price-card__list {
  list-style: none;
  padding: 0;
  margin: 20px 0;
  text-align: left;
  font-size: 0.9rem;
  color: var(--navy);
}
.price-card__list li { margin-bottom: 10px; }

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

/* ---------- Download CTA ---------- */
.cta-dark {
  background: var(--navy);
  color: var(--white);
  text-align: center;
}
.cta-dark .icon { font-size: 2.5rem; margin-bottom: 16px; }
.cta-dark h2 { color: var(--white); }
.cta-dark p { color: rgba(255,255,255,0.7); margin-bottom: 28px; }

/* ---------- Footer ---------- */
.footer {
  background: var(--navy);
  color: rgba(255,255,255,0.75);
  padding: 64px 0 32px;
}
.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer__brand .nav__logo { color: var(--white); }
.footer__brand p { margin-top: 12px; font-size: 0.9rem; }
.footer h4 {
  color: var(--white);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 10px; }
.footer a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.92rem;
}
.footer a:hover { color: var(--white); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 28px;
  font-size: 0.85rem;
}
.footer__legal { display: flex; gap: 20px; }

.lang-toggle {
  display: inline-flex;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 999px;
  overflow: hidden;
}
.lang-btn {
  background: transparent;
  border: none;
  color: rgba(255,255,255,0.75);
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
}
.lang-btn.is-active {
  background: var(--blue);
  color: var(--white);
}

@media (max-width: 900px) {
  .footer__top { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- FAQ ---------- */
.faq__item {
  border-bottom: 1px solid var(--border);
}
.faq__question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy);
}
.faq__question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--blue);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 12px;
}
.faq__question[aria-expanded="true"]::after {
  transform: rotate(45deg);
}
.faq__answer {
  display: none;
  padding: 0 4px 20px;
  color: var(--gray);
}
.faq__answer.is-open { display: block; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}
.form-hint {
  font-size: 0.8rem;
  color: var(--gray);
  margin-top: 4px;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--white);
  color: var(--navy);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-control:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.18);
}
textarea.form-control { resize: vertical; min-height: 140px; }

.form-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 36px;
}

/* ---------- Alerts ---------- */
.alert {
  display: none;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-align: center;
}
.alert.is-visible { display: block; }
.alert--success { background: #E4F9E9; color: #1F8A3D; }
.alert--error { background: #FFEAEA; color: #C22; }

/* ---------- Legal pages ---------- */
.legal {
  max-width: 760px;
  margin: 0 auto;
  padding: 72px 24px 96px;
}
.legal h1 { margin-bottom: 8px; }
.legal .updated { color: var(--gray); font-size: 0.9rem; margin-bottom: 32px; }
.legal h2 { font-size: 1.25rem; margin-top: 40px; }
.legal p, .legal li { color: var(--navy); font-size: 0.97rem; }
.legal ul { padding-left: 20px; }
.info-box {
  background: var(--blue-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 32px;
  font-weight: 600;
}

/* ---------- Simple hero (support/legal) ---------- */
.hero--simple {
  background: linear-gradient(160deg, #EAF4FF 0%, #FAFCFF 70%);
  text-align: center;
  padding: 72px 0 56px;
}
.hero--simple h1 { font-size: clamp(2rem, 4.5vw, 3rem); }

/* ---------- Feedback / support page utility ---------- */
.center-icon { font-size: 2.5rem; text-align: center; margin-bottom: 16px; }
.center-block { max-width: 520px; margin: 0 auto; text-align: center; }
.center-block .form-card { text-align: left; margin-top: 32px; }