:root {
  --primary: #2f6fed;
  --primary-hover: #245fd0;
  --background: #f7f8fb;
  --card: #ffffff;
  --text: #15171a;
  --text-muted: #737b8c;
  --border: #e8eaf0;
  --success: #32b46c;
  --notice: #eef5ff;
  --notice-border: #cfe0ff;
  --shadow-sm: 0 10px 30px rgba(21, 23, 26, 0.06);
  --shadow-md: 0 24px 70px rgba(21, 23, 26, 0.1);
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1200px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 82% 12%, rgba(47, 111, 237, 0.08), transparent 34%),
    linear-gradient(180deg, #ffffff 0%, var(--background) 34%, #ffffff 100%);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  min-width: 320px;
  overflow-x: clip;
}

body.menu-open {
  overflow: hidden;
}

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

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

a:hover {
  color: var(--primary);
}

:focus-visible {
  outline: 3px solid rgba(47, 111, 237, 0.45);
  outline-offset: 3px;
}

.skip-link {
  background: var(--primary);
  border-radius: 0 0 12px 12px;
  color: #ffffff;
  left: 20px;
  padding: 10px 16px;
  position: fixed;
  top: -56px;
  z-index: 200;
}

.skip-link:focus {
  top: 0;
}

.site-header {
  height: var(--header-height);
  left: 0;
  position: sticky;
  right: 0;
  top: 0;
  z-index: 100;
  transition: background 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(21, 23, 26, 0.04);
}

.nav-shell,
.container {
  margin: 0 auto;
  max-width: var(--max-width);
  padding-left: 40px;
  padding-right: 40px;
}

.nav-shell {
  align-items: center;
  display: flex;
  height: var(--header-height);
  justify-content: space-between;
}

.brand {
  align-items: center;
  display: inline-flex;
  font-weight: 800;
  gap: 12px;
  letter-spacing: 0;
}

.brand-logo {
  height: 38px;
  width: 38px;
}

.site-nav {
  align-items: center;
  display: flex;
  gap: 8px;
}

.site-nav a {
  border-radius: 12px;
  color: #424856;
  font-size: 0.95rem;
  font-weight: 650;
  min-height: 44px;
  padding: 10px 13px;
  transition: background 180ms ease, color 180ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: #eef4ff;
  color: var(--primary);
}

.menu-toggle {
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  display: none;
  height: 44px;
  justify-content: center;
  padding: 0;
  width: 44px;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  background: var(--text);
  border-radius: 2px;
  content: "";
  display: block;
  height: 2px;
  position: relative;
  transition: transform 180ms ease, opacity 180ms ease;
  width: 20px;
}

.menu-icon::before {
  position: absolute;
  top: -7px;
}

.menu-icon::after {
  position: absolute;
  top: 7px;
}

.menu-toggle[aria-expanded="true"] .menu-icon {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-icon::before {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-icon::after {
  transform: translateY(-7px) rotate(-45deg);
}

.section {
  padding: 100px 0;
}

.section-compact {
  padding: 72px 0;
}

.hero {
  padding: 78px 0 110px;
}

.hero-grid {
  align-items: center;
  display: grid;
  gap: 70px;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
}

.eyebrow {
  align-items: center;
  color: var(--primary);
  display: inline-flex;
  font-size: 0.83rem;
  font-weight: 800;
  gap: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.eyebrow::before {
  background: var(--success);
  border-radius: 999px;
  content: "";
  height: 8px;
  width: 8px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.8rem, 7vw, 5.6rem);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.98;
  margin-bottom: 24px;
  max-width: 760px;
}

h2 {
  font-size: clamp(2rem, 4.2vw, 3.35rem);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.08;
  margin-bottom: 18px;
}

h3 {
  font-size: 1.15rem;
  font-weight: 780;
  line-height: 1.25;
  margin-bottom: 10px;
}

.lead {
  color: #4b5364;
  font-size: clamp(1.08rem, 2vw, 1.32rem);
  font-weight: 500;
  line-height: 1.55;
  margin-bottom: 16px;
  max-width: 680px;
}

.supporting {
  color: var(--text-muted);
  font-weight: 500;
  max-width: 650px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 32px 0 22px;
}

.btn {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 14px;
  cursor: pointer;
  display: inline-flex;
  font-weight: 750;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 14px 30px rgba(47, 111, 237, 0.18);
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--card);
  border-color: var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: #bed1fb;
  color: var(--primary);
  transform: translateY(-1px);
}

.note-line {
  align-items: flex-start;
  color: #4c5a70;
  display: flex;
  font-size: 0.95rem;
  font-weight: 650;
  gap: 10px;
  max-width: 720px;
}

.note-line::before,
.check-list li::before {
  background: var(--success);
  border-radius: 999px;
  color: #ffffff;
  content: "";
  flex: 0 0 auto;
  height: 10px;
  margin-top: 8px;
  width: 10px;
}

.phone-stage {
  display: grid;
  justify-items: center;
  min-width: 0;
}

.phone {
  background: #15171a;
  border-radius: 40px;
  box-shadow: var(--shadow-md);
  padding: 12px;
  position: relative;
  width: min(100%, 350px);
}

.phone::before {
  background: #252932;
  border-radius: 999px;
  content: "";
  height: 5px;
  left: 50%;
  position: absolute;
  top: 8px;
  transform: translateX(-50%);
  width: 68px;
  z-index: 2;
}

.phone-screen {
  background: #f4f6fa;
  border-radius: 30px;
  min-height: 640px;
  overflow: hidden;
  padding: 28px 18px 20px;
}

.app-top {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin-bottom: 22px;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 800;
}

.app-dot {
  background: #dfe5f2;
  border-radius: 999px;
  height: 32px;
  width: 32px;
}

.app-tabs {
  background: #e9edf5;
  border-radius: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 20px;
  padding: 4px;
}

.app-tabs span {
  border-radius: 11px;
  color: #6b7280;
  font-size: 0.86rem;
  font-weight: 750;
  padding: 8px 10px;
  text-align: center;
}

.app-tabs span:first-child {
  background: #ffffff;
  box-shadow: 0 6px 16px rgba(21, 23, 26, 0.08);
  color: var(--primary);
}

.channel-list,
.category-list {
  display: grid;
  gap: 11px;
}

.channel-row,
.category-row {
  align-items: center;
  background: #ffffff;
  border: 1px solid #edf0f5;
  border-radius: 16px;
  display: flex;
  gap: 12px;
  min-height: 62px;
  padding: 12px;
}

.channel-thumb,
.category-icon {
  align-items: center;
  background: #eef4ff;
  border-radius: 13px;
  color: var(--primary);
  display: flex;
  flex: 0 0 40px;
  font-weight: 800;
  height: 40px;
  justify-content: center;
}

.channel-meta,
.category-meta {
  min-width: 0;
}

.channel-name,
.category-name {
  color: #20242c;
  display: block;
  font-size: 0.93rem;
  font-weight: 780;
  overflow-wrap: anywhere;
}

.channel-type,
.category-count {
  color: var(--text-muted);
  display: block;
  font-size: 0.78rem;
  font-weight: 650;
}

.star {
  color: var(--success);
  font-size: 1rem;
  font-weight: 900;
  margin-left: auto;
}

.section-heading {
  margin: 0 auto 42px;
  max-width: 760px;
  text-align: center;
}

.section-heading p {
  color: var(--text-muted);
  font-size: 1.08rem;
  font-weight: 500;
}

.feature-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, 1fr);
}

.feature-card,
.step-card,
.legal-card,
.contact-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.feature-card {
  min-height: 238px;
  padding: 26px;
  transition: border-color 200ms ease, box-shadow 200ms ease, transform 200ms ease;
}

.feature-card:hover {
  border-color: #c8d8fb;
  box-shadow: 0 18px 48px rgba(47, 111, 237, 0.11);
  transform: translateY(-3px);
}

.icon-box {
  align-items: center;
  background: #eef4ff;
  border-radius: 16px;
  color: var(--primary);
  display: flex;
  height: 52px;
  justify-content: center;
  margin-bottom: 22px;
  width: 52px;
}

.icon-box svg,
.notice-icon svg {
  height: 26px;
  width: 26px;
}

.feature-card p,
.step-card p,
.legal-card p,
.contact-card p {
  color: var(--text-muted);
  margin-bottom: 0;
}

.preview-section {
  background: #ffffff;
}

.preview-grid {
  align-items: start;
  display: grid;
  gap: 44px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  justify-items: center;
}

.preview-phone .phone-screen {
  min-height: 610px;
}

.category-row {
  justify-content: space-between;
}

.category-meta {
  flex: 1;
}

.steps-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 26px;
}

.step-card {
  padding: 28px;
}

.step-number {
  color: var(--primary);
  display: block;
  font-size: 0.88rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  margin-bottom: 22px;
}

.disclaimer-strip {
  background: #f0f7f3;
  border: 1px solid #d8efdf;
  border-radius: var(--radius-lg);
  color: #285c3c;
  font-weight: 650;
  padding: 18px 22px;
}

.privacy-band {
  background: #f3f6fb;
}

.privacy-grid {
  align-items: center;
  display: grid;
  gap: 46px;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
}

.check-list {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.check-list li {
  align-items: flex-start;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 16px;
  color: #3e4655;
  display: flex;
  font-weight: 650;
  gap: 12px;
  padding: 16px 18px;
}

.notice-card {
  align-items: flex-start;
  background: var(--notice);
  border: 1px solid var(--notice-border);
  border-radius: 24px;
  display: grid;
  gap: 22px;
  grid-template-columns: auto minmax(0, 1fr);
  padding: 34px;
}

.notice-icon {
  align-items: center;
  background: #ffffff;
  border-radius: 18px;
  color: var(--primary);
  display: flex;
  height: 58px;
  justify-content: center;
  width: 58px;
}

.notice-card p:last-child {
  margin-bottom: 0;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin: 0 auto;
  max-width: 860px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
}

.faq-question {
  align-items: center;
  background: transparent;
  border: 0;
  color: var(--text);
  cursor: pointer;
  display: flex;
  font: inherit;
  font-weight: 780;
  justify-content: space-between;
  min-height: 62px;
  padding: 18px 22px;
  text-align: left;
  width: 100%;
}

.faq-question::after {
  color: var(--primary);
  content: "+";
  flex: 0 0 auto;
  font-size: 1.45rem;
  line-height: 1;
  margin-left: 18px;
}

.faq-question[aria-expanded="true"]::after {
  content: "-";
}

.faq-answer {
  color: var(--text-muted);
  padding: 0 22px 22px;
}

.developer-card {
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(0, 1fr) auto;
  padding: 36px;
}

.email-link {
  color: var(--primary);
  font-weight: 780;
  overflow-wrap: anywhere;
}

.site-footer {
  background: #10141d;
  color: #ffffff;
  padding: 56px 0 28px;
}

.footer-grid {
  display: grid;
  gap: 34px;
  grid-template-columns: 1.4fr repeat(3, 1fr) 1.35fr;
}

.footer-brand .brand {
  color: #ffffff;
  margin-bottom: 14px;
}

.footer-grid p,
.footer-bottom,
.footer-link-list a {
  color: #b8c0cf;
}

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

.footer-heading {
  color: #ffffff;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  margin-top: 42px;
  padding-top: 22px;
}

.legal-hero {
  padding: 76px 0 36px;
}

.legal-shell {
  margin: 0 auto;
  max-width: 900px;
  padding-left: 40px;
  padding-right: 40px;
}

.legal-doc {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
  padding: 42px;
}

.legal-doc h1 {
  font-size: clamp(2.3rem, 5vw, 3.6rem);
  line-height: 1.05;
}

.legal-doc h2 {
  border-top: 1px solid var(--border);
  font-size: 1.35rem;
  margin: 34px 0 12px;
  padding-top: 28px;
}

.legal-doc p,
.legal-doc li {
  color: #4b5364;
}

.legal-doc ul {
  padding-left: 22px;
}

.document-meta {
  color: var(--text-muted);
  font-weight: 650;
  margin-bottom: 32px;
}

.placeholder-box {
  background: #f8fafc;
  border: 1px dashed #b9c5d8;
  border-radius: 16px;
  color: #475569;
  font-weight: 650;
  padding: 18px;
}

.contact-layout {
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
}

.contact-card {
  padding: 30px;
}

.contact-list {
  display: grid;
  gap: 16px;
  margin: 22px 0;
}

.contact-list div {
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
}

.contact-list dt {
  color: var(--text-muted);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.contact-list dd {
  font-weight: 750;
  margin: 4px 0 0;
}

@media (max-width: 1200px) {
  .hero-grid {
    gap: 52px;
    grid-template-columns: minmax(0, 1fr) minmax(300px, 390px);
  }

  .feature-grid {
    gap: 18px;
  }
}

@media (max-width: 992px) {
  .nav-shell,
  .container {
    padding-left: 28px;
    padding-right: 28px;
  }

  .hero-grid,
  .privacy-grid,
  .developer-card,
  .contact-layout {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  .site-header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border);
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    display: none;
    gap: 4px;
    left: 0;
    padding: 10px 20px 18px;
    position: absolute;
    right: 0;
    top: var(--header-height);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    width: 100%;
  }

  .section {
    padding: 72px 0;
  }

  .hero {
    padding: 56px 0 78px;
  }

  .hero-grid {
    gap: 42px;
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .feature-grid,
  .steps-grid,
  .preview-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .phone {
    max-width: 330px;
  }

  .phone-screen {
    min-height: 590px;
  }

  .notice-card {
    grid-template-columns: 1fr;
    padding: 26px;
  }

  .developer-card {
    padding: 28px;
  }

  .legal-shell {
    padding-left: 24px;
    padding-right: 24px;
  }

  .legal-doc {
    padding: 28px;
  }
}

@media (max-width: 480px) {
  .nav-shell,
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .brand {
    gap: 9px;
  }

  .brand-logo {
    height: 34px;
    width: 34px;
  }

  .phone {
    border-radius: 34px;
    max-width: 100%;
    padding: 10px;
    width: min(100%, 318px);
  }

  .phone-screen {
    border-radius: 25px;
    min-height: 560px;
    padding: 26px 14px 18px;
  }

  .channel-row,
  .category-row {
    min-height: 58px;
    padding: 10px;
  }

  .footer-bottom {
    display: grid;
  }

  .legal-shell {
    padding-left: 18px;
    padding-right: 18px;
  }
}

@media (max-width: 400px) {
  .nav-shell,
  .container,
  .legal-shell {
    padding-left: 16px;
    padding-right: 16px;
  }

  .phone {
    width: min(100%, 300px);
  }

  .channel-name,
  .category-name {
    font-size: 0.86rem;
  }
}

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