:root {
  --bg-color: #f2f4f6;
  --surface-color: #ffffff;
  --primary-color: #2d3436;
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --accent-color: #50c878;
  --accent-glow: rgba(80, 200, 120, 0.3);
  --danger-color: #ff7675;
  --warning-color: #fdcb6e;
  --nav-bg: rgba(255, 255, 255, 0.9);
  --nav-border: #dfe6e9;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.08);
  --font-main: "Coolvetica", "Poppins", sans-serif;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --surface-color: #1e1e1e;
  --primary-color: #ffffff;
  --text-primary: #f5f6fa;
  --text-secondary: #b2bec3;
  --accent-color: #50c878;
  --accent-glow: rgba(80, 200, 120, 0.15);
  --nav-bg: rgba(30, 30, 30, 0.9);
  --nav-border: #333;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.4);
}

@font-face {
  font-family: "Coolvetica";
  src: url("font/coolvetica/coolvetica_Rg.otf") format("opentype");
  font-weight: normal;
  font-style: normal;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  background: var(--bg-color);
  color: var(--text-primary);
  overflow-x: hidden;
  transition: background 0.5s ease, color 0.5s ease;
}
a {
  text-decoration: none;
  color: inherit;
}

#navbar-container {
  position: relative;
  z-index: 9999;
}
.nav-sticky {
  position: fixed;
  top: 25px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  padding: 10px 20px;
  border-radius: 50px;
  border: 1px solid var(--nav-border);
  gap: 15px;
  z-index: 10000;
  box-shadow: var(--shadow-soft);
  max-width: 90%;
  transition: background 0.5s ease, border-color 0.5s ease;
}

.scroll-link,
.theme-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  color: var(--text-secondary);
  border-radius: 50%;
  transition: var(--transition);
  cursor: pointer;
  background: transparent;
  border: none;
  font-size: 1.1rem;
  position: relative;
  overflow: hidden;
}
.scroll-link:hover,
.scroll-link.active {
  background: var(--accent-color);
  color: #fff;
}
.nav-divider {
  width: 1px;
  height: 24px;
  background: var(--nav-border);
  margin: 0 5px;
}

.theme-btn i {
  position: absolute;
  transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.27, 1.55),
    opacity 0.4s ease;
}
.icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
.icon-sun {
  opacity: 0;
  transform: rotate(180deg) scale(0.5);
}
[data-theme="dark"] .icon-moon {
  opacity: 0;
  transform: rotate(-180deg) scale(0.5);
}
[data-theme="dark"] .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 10%;
  position: relative;
}
.hero-content {
  flex: 1;
  z-index: 2;
  max-width: 600px;
}
.logo-display {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 25px;
  color: var(--accent-color);
}
.logo-display h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -1px;
}
.hero-tagline {
  font-size: clamp(3rem, 5vw, 5rem);
  line-height: 1.1;
  margin-bottom: 25px;
  background: linear-gradient(
    45deg,
    var(--text-primary),
    var(--text-secondary)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 45px;
}
.hero-actions {
  display: flex;
  gap: 20px;
}
.btn {
  padding: 16px 36px;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.primary-btn {
  background: var(--accent-color);
  color: white;
  box-shadow: 0 5px 15px var(--accent-glow);
}
.primary-btn:hover {
  transform: translateY(-3px);
}
.secondary-btn {
  border: 2px solid var(--text-primary);
  color: var(--text-primary);
  background: transparent;
}
.secondary-btn:hover {
  background: var(--text-primary);
  color: var(--bg-color);
}
.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  height: 400px;
}
.sound-wave {
  display: flex;
  gap: 12px;
  align-items: center;
  height: 100%;
}
.bar {
  width: 20px;
  background: var(--accent-color);
  border-radius: 10px;
  animation: equalize 1.5s infinite;
}
.bar:nth-child(1) {
  height: 60px;
  animation-delay: 0.1s;
}
.bar:nth-child(2) {
  height: 120px;
  animation-delay: 0.3s;
}
.bar:nth-child(3) {
  height: 180px;
}
.bar:nth-child(4) {
  height: 100px;
  animation-delay: 0.4s;
}
.bar:nth-child(5) {
  height: 50px;
  animation-delay: 0.2s;
}
@keyframes equalize {
  0%,
  100% {
    transform: scaleY(1);
    opacity: 0.8;
  }
  50% {
    transform: scaleY(1.5);
    opacity: 1;
  }
}

.info-section {
  padding: 120px 20px;
  background: var(--surface-color);
  transition: background 0.5s ease;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: 70px;
}
.badge {
  background: var(--accent-glow);
  color: var(--accent-color);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
}
.section-header h2 {
  margin-top: 20px;
  font-size: 2.5rem;
}
.grid-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}
.feature-card {
  background: var(--bg-color);
  padding: 45px;
  border-radius: 28px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.5s ease;
}
.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-soft);
}
.icon-box {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 25px;
}
.danger-theme .icon-box {
  background: rgba(255, 118, 117, 0.1);
  color: var(--danger-color);
}
.warning-theme .icon-box {
  background: rgba(253, 203, 110, 0.1);
  color: var(--warning-color);
}
.success-theme .icon-box {
  background: rgba(80, 200, 120, 0.1);
  color: var(--accent-color);
}

.scroll-showcase {
  position: relative;
  width: 100%;
  padding-bottom: 100px;
}

.sticky-wrapper {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
}

.phone-stage {
  position: sticky;
  top: 15vh;
  height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  grid-column: 2;
  z-index: 10;
  transition: transform 0.8s cubic-bezier(0.45, 0, 0.55, 1);
}

.phone-frame {
  width: 320px;
  height: 640px;
  background: var(--primary-color);
  border-radius: 50px;
  padding: 12px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.2);
  position: relative;
  transform-style: preserve-3d;
  transition: transform 1s cubic-bezier(0.68, -0.55, 0.27, 1.55),
    background 0.5s ease;
}

.screen-content {
  position: absolute;
  top: 12px;
  left: 12px;
  bottom: 12px;
  right: 12px;
  border-radius: 40px;
  overflow: hidden;
  background: #121212;
  backface-visibility: hidden;
}

.front-screen {
  transform: rotateY(0deg);
}
.back-screen {
  transform: rotateY(180deg);
}

.phone-stage.move-left {
  transform: translateX(-100%);
}

.phone-frame.rotate-active {
  transform: rotateY(180deg);
}

.text-content {
  grid-column: 1 / span 2;
  position: relative;
  z-index: 5;
}

.text-block {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px;
  max-width: 450px;
}

.block-1 {
  grid-column: 1;
}

.block-2 {
  margin-left: auto;
  text-align: left;
}

.text-block h2 {
  font-size: 2.8rem;
  margin-bottom: 25px;
}
.text-block p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  margin-bottom: 30px;
}
.check-list li {
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  font-size: 1.1rem;
}
.check-list i {
  color: var(--accent-color);
}

.alert-mock {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--danger-color);
  color: white;
  animation: pulse 1s infinite;
}
.alert-mock i {
  font-size: 5rem;
  margin-bottom: 20px;
}
.settings-mock {
  padding: 30px 20px;
  color: #fff;
}
.mock-header {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 20px;
}
.mock-item {
  background: #333;
  padding: 15px;
  border-radius: 12px;
  margin-bottom: 15px;
}
.mock-slider {
  height: 6px;
  background: #555;
  border-radius: 3px;
  margin-top: 10px;
}
.mock-slider .fill {
  width: 60%;
  height: 100%;
  background: var(--accent-color);
}
.mock-list .mock-row {
  display: flex;
  gap: 10px;
  padding: 15px;
  border-bottom: 1px solid #333;
}
.mock-row span {
  margin-left: auto;
  color: #888;
}
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

.download-section {
  padding: 120px 20px;
  text-align: center;
  background: var(--surface-color);
  transition: background 0.5s ease;
}
.download-grid {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 50px;
}
.download-card {
  background: var(--bg-color);
  padding: 50px 30px;
  border-radius: 30px;
  width: 320px;
  transition: var(--transition);
  border: 2px solid transparent;
}
.download-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-8px);
}
.download-card i {
  font-size: 3.5rem;
  margin-bottom: 25px;
  color: var(--primary-color);
}
.download-btn {
  width: 100%;
  padding: 14px;
  margin-top: 10px;
  background: var(--primary-color);
  color: var(--bg-color);
  border: none;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
}
.download-btn.outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}
.download-btn.outline:hover {
  background: var(--primary-color);
  color: var(--bg-color);
}

footer {
  padding: 80px 20px;
  background: var(--bg-color);
  text-align: center;
  transition: background 0.5s ease;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 20px 0;
}
.footer-links a:hover {
  color: var(--accent-color);
}

.i18n-fade {
  opacity: 0;
  transform: translateY(5px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

@media (max-width: 968px) {
  .hero-section {
    flex-direction: column;
    text-align: center;
    padding-top: 140px;
  }
  .hero-visual {
    width: 100%;
    height: 300px;
    margin-top: 40px;
  }
  .hero-actions {
    justify-content: center;
  }

  .sticky-wrapper {
    grid-template-columns: 1fr;
  }

  .phone-stage {
    position: sticky;
    top: 100px;
    height: 600px;
    grid-column: 1;
    margin: 20px 0;
    justify-content: center;
    pointer-events: none;
    z-index: 1;
    opacity: 0.9;
  }

  .phone-frame {
    width: 260px;
    height: 520px;
    margin: 0 auto;
  }

  .text-content {
    grid-column: 1;
    z-index: 5;
  }

  .text-block {
    min-height: 50vh;
    margin: 20px auto !important;
    text-align: center !important;
    padding: 20px;
    background: rgba(var(--bg-color), 0.8);
    backdrop-filter: blur(5px);
    border-radius: 20px;
  }

  .block-1 {
    margin-bottom: 400px;
  }

  .block-2 {
    order: 2;
  }

  .phone-stage.move-left {
    transform: none;
  }
  .text-content {
    visibility: hidden;
  }

  .scroll-link,
  .theme-btn {
    width: 44px;
    height: 28px;
  }
}

.footer-logo {
  font-size: 2rem;
}

.title-icon {
  color: var(--accent-color);
  margin-right: 10px;
}
.lang-switch {
  display: flex;
  gap: 5px;
  font-weight: 600;
}
.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
}
.lang-btn.active {
  color: var(--text-primary);
  text-decoration: underline var(--accent-color);
}