/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-text: #1b1b1b;
  --color-blue: #2c6bed;
  --color-blue-dark: #1851B4;
  --color-hero-bg: #9DBBF8;
  --color-features-bg: #F6F6F6;
  --color-footer-bg: #3C3744;
  --color-footer-text: #E9E9E9;
  --color-border: #ebeaeb;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --radius: 16px;
  --container: 1200px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* ===== Typography ===== */
h1 {
  font-size: 60px;
  font-weight: 800;
  line-height: 1.07;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.15;
}

p {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.4;
}

@media (max-width: 768px) {
  h1 { font-size: 40px; }
  h2 { font-size: 28px; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 24px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 600;
  transition: all 0.15s ease;
  cursor: pointer;
  border: none;
}

.btn-white {
  background: #fff;
  color: var(--color-blue);
}

.btn-white:hover {
  background: #fff;
  color: var(--color-blue-dark);
}

.btn-outline {
  background: transparent;
  color: var(--color-blue);
  border: 2px solid var(--color-blue);
}

.btn-outline:hover {
  border-color: var(--color-blue-dark);
  color: var(--color-blue-dark);
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  height: 72px;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-img {
  height: 36px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text);
  transition: color 0.15s;
}

.nav-link:hover {
  color: var(--color-blue);
}

.nav-link.lang {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

@media (max-width: 1023px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    gap: 16px;
  }
  .nav-menu.is-open { display: flex; }
}

/* ===== Hero ===== */
.hero {
  background: var(--color-hero-bg);
  padding-top: 72px; /* navbar height */
  min-height: 680px;
  overflow: hidden;
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding-top: 80px;
  padding-bottom: 0;
  min-height: 600px;
}

.hero-text {
  flex: 0 0 42%;
  max-width: 480px;
}

.hero-text h1 {
  margin-bottom: 24px;
}

.hero-text .subtitle {
  font-size: 20px;
  line-height: 1.5;
  margin-bottom: 32px;
  color: var(--color-text);
}

.hero-phones {
  flex: 1;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  height: 560px;
}

.phone {
  width: 280px;
  filter: drop-shadow(0 20px 40px rgba(0,0,0,0.18));
  transform: rotate(12deg);
}

.phone-1 {
  position: relative;
  z-index: 2;
  margin-right: -60px;
}

.phone-2 {
  position: relative;
  z-index: 1;
  transform: rotate(18deg);
  margin-top: -20px;
}

@media (max-width: 1023px) {
  .hero-inner {
    flex-direction: column;
    text-align: center;
    padding-top: 48px;
  }
  .hero-text {
    max-width: 100%;
  }
  .hero-phones {
    height: 420px;
  }
  .phone {
    width: 200px;
  }
}

@media (max-width: 600px) {
  .phone {
    width: 160px;
  }
  .hero-phones {
    height: 340px;
  }
}

/* ===== Sections common ===== */
.section {
  padding: 80px 0;
}

.why-signal {
  text-align: center;
  padding-bottom: 40px;
}

.why-signal h2 {
  margin-bottom: 12px;
}

.section-desc {
  font-size: 18px;
  color: #555;
}

/* ===== Information sections ===== */
.info-row {
  display: flex;
  align-items: center;
  gap: 60px;
}

.info-text {
  flex: 1;
}

.info-text h2 {
  margin-bottom: 24px;
}

.info-text p {
  font-size: 18px;
  line-height: 1.55;
  margin-bottom: 28px;
  max-width: 480px;
}

.info-visual {
  flex: 1;
  display: flex;
  justify-content: center;
}

.info-img {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius);
}

/* Lottie placeholder */
.lottie-placeholder {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1 / 1.1;
  background: #a5cad5;
  border-radius: var(--radius);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 40px;
}

.lottie-placeholder .bubble {
  width: 80px;
  height: 40px;
  background: #0d7377;
  border-radius: 24px;
  position: relative;
}

.lottie-placeholder .bubble::before {
  content: '···';
  color: #fff;
  font-size: 28px;
  letter-spacing: 4px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
}

.information.reverse .info-row {
  flex-direction: row-reverse;
}

@media (max-width: 900px) {
  .info-row,
  .information.reverse .info-row {
    flex-direction: column;
    gap: 40px;
  }
  .info-text p {
    max-width: 100%;
  }
}

/* ===== Features Grid ===== */
.features {
  background: var(--color-features-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px 28px 36px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08), 0 0 2px rgba(0,0,0,0.06);
  text-align: center;
  transition: transform 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
}

.feature-card img {
  width: 100%;
  max-width: 320px;
  margin: 0 auto 20px;
  border-radius: 12px;
}

.feature-card h3 {
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 16px;
  line-height: 1.45;
  color: #444;
  max-width: 360px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Footer ===== */
.footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 56px 0 48px;
  font-size: 15px;
  line-height: 1.5;
}

.footer a {
  color: var(--color-footer-text);
  transition: opacity 0.15s;
}

.footer a:hover {
  opacity: 0.75;
  text-decoration: underline;
}

.footer-inner {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-left {
  flex: 1;
  min-width: 260px;
  max-width: 380px;
}

.footer-left p {
  margin-bottom: 12px;
  font-size: 14px;
}

.footer-cols {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 120px;
}

.footer-col strong {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: #fff;
}

@media (max-width: 700px) {
  .footer-inner {
    flex-direction: column;
    gap: 40px;
  }
  .footer-cols {
    gap: 32px;
  }
}