:root {
  --primary: #266ef2;
  --primary-light: #dfe9ff;
  --primary-dark: #1749b8;
  --bg-primary: #f2f2f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f8f9fd;
  --text-primary: rgba(0, 0, 0, 0.9);
  --text-secondary: rgba(0, 0, 0, 0.62);
  --text-tertiary: rgba(0, 0, 0, 0.42);
  --border-color: rgba(60, 60, 67, 0.12);
  --shadow-sm: 0 2px 8px rgba(20, 31, 56, 0.08);
  --shadow-md: 0 8px 24px rgba(20, 31, 56, 0.1);
  --shadow-lg: 0 18px 60px rgba(20, 31, 56, 0.16);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #000000;
    --bg-secondary: #1c1c1e;
    --bg-tertiary: #2c2c2e;
    --text-primary: rgba(255, 255, 255, 0.94);
    --text-secondary: rgba(255, 255, 255, 0.66);
    --text-tertiary: rgba(255, 255, 255, 0.45);
    --border-color: rgba(84, 84, 88, 0.62);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.28);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.36);
    --shadow-lg: 0 18px 60px rgba(0, 0, 0, 0.46);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-width: 320px;
  color: var(--text-primary);
  background: var(--bg-primary);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.navbar {
  position: fixed;
  z-index: 1000;
  top: 0;
  right: 0;
  left: 0;
  border-bottom: 1px solid var(--border-color);
  background: color-mix(in srgb, var(--bg-secondary) 88%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: var(--spacing-md);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.08rem;
}

.nav-logo img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-links a {
  position: relative;
  padding: 8px 0;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
}

.nav-links a::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  content: "";
  transition: width 180ms ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  background: transparent;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: var(--text-primary);
}

.language-selector {
  position: relative;
}

.language-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: none;
  min-width: 220px;
  max-height: 360px;
  overflow: auto;
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-lg);
}

.language-selector.active .lang-dropdown {
  display: block;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  background: transparent;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.lang-option:hover,
.lang-option.active {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.hero {
  padding: 128px 0 76px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  align-items: center;
  gap: var(--spacing-3xl);
}

.eyebrow {
  display: inline-flex;
  margin-bottom: var(--spacing-md);
  padding: 6px 12px;
  border: 1px solid color-mix(in srgb, var(--primary) 24%, transparent);
  border-radius: 999px;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 11%, transparent);
  font-weight: 700;
  font-size: 0.82rem;
}

h1,
h2,
h3,
h4 {
  color: var(--text-primary);
  line-height: 1.16;
}

h1 {
  max-width: 760px;
  font-size: clamp(1.85rem, 3.8vw, 3rem);
  letter-spacing: 0;
}

h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
}

h3 {
  font-size: 1.08rem;
}

.hero-subtitle {
  max-width: 650px;
  margin: var(--spacing-lg) 0 var(--spacing-xl);
  color: var(--text-secondary);
  font-size: clamp(0.96rem, 1.25vw, 1.06rem);
}

.hero-buttons,
.download .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
}

.hero-buttons {
  justify-content: flex-start;
}

.btn,
.store-badge,
.contact-email {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.btn:hover,
.store-badge:hover,
.contact-email:hover {
  transform: translateY(-1px);
}

.btn-primary,
.store-badge,
.contact-email {
  color: #ffffff;
  background: var(--primary);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.apple-mark {
  font-size: 1.35em;
  line-height: 1;
}

.device-stage {
  display: flex;
  justify-content: center;
}

.device-frame {
  width: min(100%, 400px);
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 38px;
  background: linear-gradient(145deg, #fefefe, #dfe4f4);
  box-shadow: var(--shadow-lg);
}

@media (prefers-color-scheme: dark) {
  .device-frame {
    background: linear-gradient(145deg, #323238, #111114);
  }
}

.device-screen {
  min-height: 680px;
  padding: 22px;
  border-radius: 28px;
  background: var(--bg-secondary);
  overflow: hidden;
}

.mock-header,
.doc-row {
  display: flex;
  align-items: center;
}

.mock-header {
  justify-content: space-between;
  margin-bottom: 18px;
}

.mock-kicker,
.doc-row small,
.mini-preview span,
.legal-header p {
  color: var(--text-secondary);
}

.mock-add {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: white;
  background: var(--primary);
  font-size: 1.18rem;
}

.mock-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 18px;
  padding: 4px;
  border-radius: 12px;
  background: var(--bg-primary);
}

.mock-tabs span {
  min-width: 0;
  padding: 8px 6px;
  border-radius: 9px;
  font-size: 0.76rem;
  font-weight: 700;
  text-align: center;
}

.mock-tabs span:first-child {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
}

.mock-list {
  display: grid;
  gap: 10px;
}

.doc-row {
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: var(--bg-tertiary);
}

.doc-row > span {
  width: 38px;
  height: 38px;
  border-radius: 12px;
}

.doc-row.blue > span { background: #dfe9ff; }
.doc-row.green > span { background: #dff7ec; }
.doc-row.purple > span { background: #efe5ff; }

.doc-row div {
  display: grid;
  min-width: 0;
}

.canvas-card {
  position: relative;
  height: 260px;
  margin-top: 18px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background:
    linear-gradient(var(--border-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-color) 1px, transparent 1px),
    var(--bg-tertiary);
  background-size: 26px 26px;
}

.stroke {
  position: absolute;
  height: 5px;
  border-radius: 999px;
  background: var(--primary);
  opacity: 0.75;
  transform: rotate(-10deg);
}

.stroke-one {
  top: 58px;
  left: 32px;
  width: 160px;
}

.stroke-two {
  top: 82px;
  left: 48px;
  width: 110px;
  background: #2aa56f;
}

.mind-node {
  position: absolute;
  display: grid;
  place-items: center;
  min-width: 70px;
  min-height: 38px;
  padding: 8px;
  border-radius: 12px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  font-size: 0.82rem;
  font-weight: 700;
}

.node-a { right: 118px; bottom: 92px; }
.node-b { right: 36px; bottom: 42px; }
.node-c { left: 44px; bottom: 36px; }

.section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  max-width: 720px;
  margin: 0 auto var(--spacing-2xl);
  text-align: center;
}

.section-header p,
.showcase p {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--spacing-lg);
}

.card,
.mini-preview,
.legal-container,
.contact-box {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
}

.card {
  padding: var(--spacing-lg);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: var(--spacing-md);
  border-radius: 14px;
  color: white;
  font-weight: 900;
}

.card p {
  margin-top: 10px;
  color: var(--text-secondary);
}

.card-icon.blue { background: var(--primary); }
.card-icon.green { background: #2aa56f; }
.card-icon.purple { background: #7d57c7; }
.card-icon.orange { background: #f19a2a; }
.card-icon.red { background: #df514f; }
.card-icon.teal { background: #129b9b; }

.showcase {
  background: var(--bg-secondary);
}

.showcase-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: var(--spacing-2xl);
}

.mini-previews {
  display: grid;
  gap: var(--spacing-md);
}

.mini-preview {
  display: grid;
  gap: 6px;
  padding: var(--spacing-lg);
}

.download {
  text-align: center;
}

.legal-page {
  padding: 112px 0 64px;
}

.legal-container {
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(24px, 5vw, 48px);
}

.legal-header {
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.legal-content h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

.legal-content p,
.legal-content li {
  color: var(--text-secondary);
}

.legal-content ul {
  display: grid;
  gap: 10px;
  margin-left: 20px;
}

.legal-content li {
  padding-left: 4px;
}

.highlight-box {
  margin-top: var(--spacing-md);
  padding: var(--spacing-lg);
  border: 1px solid color-mix(in srgb, var(--primary) 22%, transparent);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--primary) 9%, transparent);
}

.contact-box {
  display: grid;
  justify-items: center;
  gap: 12px;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-xl);
  text-align: center;
}

.contact-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  color: white;
  background: var(--primary);
  font-weight: 900;
  font-size: 1.25rem;
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0;
  color: var(--text-primary);
  font-weight: 700;
  cursor: pointer;
}

.faq-question::after {
  content: "⌄";
  color: var(--text-tertiary);
  transition: transform 180ms ease;
}

.faq-item.active .faq-question::after {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding-bottom: 18px;
}

.faq-item.active .faq-answer {
  display: block;
}

.footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.footer-content {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--spacing-xl);
  padding: var(--spacing-2xl) var(--spacing-md);
}

.footer-content div {
  display: grid;
  align-content: start;
  gap: 8px;
}

.footer p,
.footer a {
  color: var(--text-secondary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-lg);
}

.fade-in {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms ease, transform 560ms ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 90ms; }
.fade-in-delay-2 { transition-delay: 160ms; }

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  .nav-links,
  .navbar-right {
    position: absolute;
    right: 16px;
    left: 16px;
    display: none;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-lg);
  }

  .nav-links {
    top: 72px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  .nav-links a {
    padding: 12px;
  }

  .navbar-right {
    top: 240px;
    padding: 10px;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
  }

  .nav-links.active,
  .navbar-right.active {
    display: flex;
  }

  .language-selector,
  .language-btn {
    width: 100%;
  }

  .language-btn {
    justify-content: space-between;
  }

  .lang-dropdown {
    position: static;
    margin-top: 8px;
    min-width: 0;
    width: 100%;
    box-shadow: none;
  }

  .hero-grid,
  .showcase-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .features-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-content {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .hero {
    padding-top: 104px;
  }

  .hero-buttons,
  .btn,
  .store-badge,
  .contact-email {
    width: 100%;
  }

  .features-grid,
  .footer-content {
    grid-template-columns: 1fr;
  }

  .device-screen {
    min-height: 590px;
    padding: 16px;
  }

  .mock-tabs {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}