@charset "UTF-8";

:root {
  --primary: #FF4D6D;
  --primary-dark: #E83A5A;
  --primary-light: #FF8FA3;
  --primary-bg: #FFF0F3;
  --secondary: #FF6B8A;
  --accent: #FFB3C6;
  --text: #2D2D3A;
  --text-light: #6B6B7B;
  --text-muted: #9B9BAC;
  --bg: #FFFFFF;
  --bg-alt: #FFF5F7;
  --bg-card: #FFFFFF;
  --border: #F0E6EA;
  --shadow-sm: 0 2px 8px rgba(255, 77, 109, 0.08);
  --shadow-md: 0 4px 20px rgba(255, 77, 109, 0.12);
  --shadow-lg: 0 8px 40px rgba(255, 77, 109, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --max-width: 1200px;
  --nav-height: 72px;
}

[class^="icon-"],
[class*=" icon-"] {
  display: inline-block;
  width: 20px;
  height: 20px;
  position: relative;
  flex-shrink: 0;
  vertical-align: middle;
  font-style: normal;
  line-height: 1;
}

.icon-svg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  flex-shrink: 0;
  color: inherit;
}

.icon-svg svg {
  width: 100%;
  height: 100%;
  display: block;
}

.icon-img {
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

.icon-sm  { width: 14px; height: 14px; }
.icon-md  { width: 20px; height: 20px; }
.icon-lg  { width: 28px; height: 28px; }
.icon-xl  { width: 48px; height: 48px; }
.icon-24  { width: 24px; height: 24px; }
.icon-36  { width: 36px; height: 36px; }
.icon-16  { width: 16px; height: 16px; }
.icon-18  { width: 18px; height: 18px; }

.icon-heart   { color: #FF4D6D; }
.icon-star    { color: #FFB800; }
.icon-chat    { color: #7C5CFC; }
.icon-check-circle { color: #10B981; }
.icon-down  { color: #9B9BAC; }
.icon-left  { color: #9B9BAC; }
.icon-right { color: #9B9BAC; }
.icon-download { color: #FF4D6D; }
.icon-user   { color: #6B6B7B; }
.icon-quote  { color: #D8D8E0; }
.icon-info   { color: #3B82F6; }
.icon-check  { color: #fff; }
.icon-menu   { color: #2D2D3A; }
.icon-close  { color: #2D2D3A; }

.tag .icon-heart,
.tag .icon-star,
.tag .icon-chat {
  color: var(--text);
  opacity: 0.6;
  transition: opacity var(--transition);
}

.tag:hover .icon-heart,
.tag:hover .icon-star,
.tag:hover .icon-chat {
  opacity: 1;
  color: var(--primary);
}

.tag.active .icon-heart,
.tag.active .icon-star,
.tag.active .icon-chat {
  opacity: 1;
  color: #fff;
}

.review-stars .icon-star {
  color: #FFB800;
  width: 16px;
  height: 16px;
}

.review-quote .icon-quote {
  color: var(--text);
  opacity: 0.2;
}

.chat-demo-features .icon-check-circle {
  color: var(--primary);
}

.reviews-arrow .icon-left,
.reviews-arrow .icon-right {
  color: var(--text-light);
  transition: color var(--transition);
}

.reviews-arrow:hover .icon-left,
.reviews-arrow:hover .icon-right {
  color: #fff;
}

.step-arrow.icon-down {
  color: var(--text-muted);
  width: 20px;
  height: 20px;
  transition: transform var(--transition);
}

.tutorial-step.open .step-arrow.icon-down {
  transform: rotate(180deg);
}

.step-illustration .icon-download,
.step-illustration .icon-user,
.step-illustration .icon-heart {
  color: var(--primary);
}

.step-tip .icon-info {
  color: var(--primary);
}

.banner-float-card .icon-heart {
  color: var(--primary);
}
.banner-float-card .icon-star {
  color: #FFB800;
}

.nav-toggle .icon-menu,
.nav-toggle .icon-close {
  color: var(--text);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  text-decoration: none;
  color: inherit;
}

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

button {
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

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

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-label {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-bg);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-header p {
  font-size: clamp(14px, 2vw, 16px);
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 4px 15px rgba(255, 77, 109, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  padding: 8px 16px;
}

.btn-ghost:hover {
  color: var(--primary);
  background: var(--primary-bg);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  will-change: transform;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

.nav-logo .logo-img {
  display: block;
  border-radius: 8px;
}

.nav-logo span {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu ul {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--transition);
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  align-items: center;
  justify-content: center;
}

@media (max-width: 768px) {

  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
  }

  .nav-overlay.active {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(180deg, #FFF5F7 0%, #FFFFFF 100%);
    padding: 20px 0;
    transform: translateX(100%);
    opacity: 0;
    transition: transform 0.38s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.3s ease;
    box-shadow: -4px 0 30px rgba(0, 0, 0, 0.06);
    z-index: 999;
    display: flex;
    flex-direction: column;
    border-left: 1px solid rgba(255, 77, 109, 0.08);
  }

  .nav-menu.active {
    transform: translateX(0);
    opacity: 1;
  }

  .nav-menu ul {
    flex-direction: column;
    gap: 4px;
    padding: 10px 16px;
    flex: 1;
    list-style: none;
    margin: 0;
  }

  .nav-menu li {
    opacity: 0;
    transform: translateX(12px);
    transition: opacity 0.35s ease, transform 0.35s ease;
  }

  .nav-menu.active li {
    opacity: 1;
    transform: translateX(0);
  }

  .nav-menu.active li:nth-child(1) { transition-delay: 0.05s; }
  .nav-menu.active li:nth-child(2) { transition-delay: 0.09s; }
  .nav-menu.active li:nth-child(3) { transition-delay: 0.13s; }
  .nav-menu.active li:nth-child(4) { transition-delay: 0.17s; }
  .nav-menu.active li:nth-child(5) { transition-delay: 0.21s; }
  .nav-menu.active li:nth-child(6) { transition-delay: 0.25s; }
  .nav-menu.active li:nth-child(7) { transition-delay: 0.29s; }

  .nav-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    font-weight: 500;
    padding: 11px 14px;
    color: #4A4A5C;
    border-radius: 10px;
    transition: all 0.2s ease;
    text-decoration: none;
    position: relative;
  }

  .nav-menu a::before {
    content: "";
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #D8D8E0;
    flex-shrink: 0;
    transition: all 0.25s ease;
  }

  .nav-menu a::after {
    display: none;
  }

  .nav-menu a:active,
  .nav-menu a.active {
    background: linear-gradient(135deg, rgba(255, 77, 109, 0.08), rgba(255, 107, 139, 0.04));
    color: var(--primary);
    font-weight: 600;
  }

  .nav-menu a.active::before {
    background: var(--primary);
    transform: scale(1.6);
    box-shadow: 0 0 8px rgba(255, 77, 109, 0.4);
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease;
  }

  .nav-toggle:active {
    background: rgba(255, 77, 109, 0.06);
  }

  .nav-actions .btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #FF4D6D 0%, #FF6B8A 100%);
    border-radius: 10px;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(255, 77, 109, 0.3);
    transition: transform 0.15s ease;
  }
}

@media (min-width: 769px) {
  .btn-mobile-cta {
    display: none !important;
  }
}

.banner {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--nav-height);
  background: linear-gradient(180deg, #FFF5F7 0%, #FFEBEF 40%, #FFFFFF 100%);
}

.banner::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 77, 109, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.banner::after {
  content: "";
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 107, 138, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.banner .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.banner-content {
  animation: fadeInUp 0.8s ease-out;
}

.banner-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 77, 109, 0.1);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 50px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.banner-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.banner-content h1 {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 12px;
  color: var(--primary);
  letter-spacing: -1px;
}

.banner-subtitle {
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--text);
}

.banner-subtitle .highlight {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.banner-content p {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-light);
  margin-bottom: 15px;
  max-width: 480px;
  line-height: 1.7;
}

.banner-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.banner-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeInRight 0.8s ease-out 0.2s both;
  position: relative;
}

.banner-phone-mockup {
  width: 280px;
  height: 560px;
  background: #fff;
  border-radius: 36px;
  box-shadow: var(--shadow-lg), 0 20px 60px rgba(255, 77, 109, 0.1);
  border: 4px solid #F8E8EC;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.banner-phone-mockup::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 6px;
  background: #E8D5DA;
  border-radius: 3px;
  z-index: 2;
}

.mockup-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 28px 20px 20px;
  color: #fff;
  text-align: center;
}

.mockup-header .mockup-avatar {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  margin: 0 auto 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.mockup-header .mockup-name {
  font-size: 14px;
  font-weight: 600;
}

.mockup-header .mockup-status {
  font-size: 11px;
  opacity: 0.8;
}

.mockup-chat {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #FFF8FA;
  overflow: hidden;
}

.mockup-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 12px;
  line-height: 1.5;
  animation: msgIn 0.4s ease-out;
}

.mockup-msg.received {
  align-self: flex-start;
  background: #fff;
  color: var(--text);
  border-bottom-left-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.mockup-msg.sent {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-bottom-right-radius: 6px;
}

.mockup-typing {
  align-self: flex-start;
  display: flex;
  gap: 4px;
  padding: 12px 16px;
  background: #fff;
  border-radius: 18px;
  border-bottom-left-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.mockup-typing span {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
}

.mockup-typing span:nth-child(2) {
  animation-delay: 0.2s;
}

.mockup-typing span:nth-child(3) {
  animation-delay: 0.4s;
}

.banner-float-card {
  position: absolute;
  background: #fff;
  border-radius: 16px;
  padding: 12px 16px;
  box-shadow: var(--shadow-md);
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: floatCard 3s ease-in-out infinite;
}

.banner-float-card.top {
  top: 10%;
  right: -20px;
  animation-delay: 0s;
}

.banner-float-card.bottom {
  bottom: 15%;
  left: -30px;
  animation-delay: 1.5s;
}

.tags-section {
  padding: 80px 0;
  background: var(--bg);
}

.tags-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-alt);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
}

.tag:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.tag.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(255, 77, 109, 0.3);
}

.tags-info {
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
}

.tags-info strong {
  color: var(--primary);
}

.features-section {
  padding: 80px 0;
  background: var(--bg-alt);
}

.screenshot-gallery {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) transparent;
  padding-bottom: 12px;
}

.screenshot-gallery::-webkit-scrollbar {
  height: 6px;
}

.screenshot-gallery::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 3px;
}

.screenshot-gallery::-webkit-scrollbar-thumb {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
}

.screenshot-track {
  display: flex;
  gap: 20px;
  padding: 0 var(--container-padding, 24px);
  width: max-content;
}

.screenshot-item {
  flex-shrink: 0;
  width: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.screenshot-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.screenshot-item img {
  display: block;
  width: 100%;
  height: 520px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.chat-demo-section {
  padding: 80px 0;
  background: var(--bg);
}

.chat-demo-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.chat-demo-info h2 {
  font-size: clamp(24px, 3.5vw, 34px);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.chat-demo-info p {
  color: var(--text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

.chat-demo-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-demo-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
}

.chat-window {
  background: #fff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  max-width: 380px;
  margin: 0 auto;
}

.chat-window-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}

.chat-window-header .cw-avatar {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.chat-window-header .cw-info .cw-name {
  font-size: 14px;
  font-weight: 600;
}

.chat-window-header .cw-info .cw-status {
  font-size: 11px;
  opacity: 0.85;
}

.chat-window-body {
  height: 360px;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #FFF8FA;
}

.chat-window-body::-webkit-scrollbar {
  width: 4px;
}

.chat-window-body::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 2px;
}

.cw-msg {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 13px;
  line-height: 1.5;
  animation: msgIn 0.35s ease-out;
}

.cw-msg.ai {
  align-self: flex-start;
  background: #fff;
  color: var(--text);
  border-bottom-left-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.cw-msg.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-bottom-right-radius: 6px;
}

.chat-quick-replies {
  padding: 12px 16px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  background: #fff;
}

.chat-quick-reply {
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 12px;
  background: var(--primary-bg);
  color: var(--primary);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.chat-quick-reply:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
}

.tutorial-section {
  padding: 80px 0;
  background: var(--bg-alt);
}

.download-area {
  max-width: 900px;
  margin: 0 auto;
}

.download-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 40px;
}

.download-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 40px 32px 32px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.download-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.card-android::before {
  background: linear-gradient(90deg, #3DDC84, #00C853);
}

.card-ios::before {
  background: linear-gradient(90deg, #555, #888);
}

.download-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
  border-color: transparent;
}

.card-android:hover {
  box-shadow: 0 16px 48px rgba(61, 220, 132, 0.15);
}

.card-ios:hover {
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

.card-platform-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
}

.card-android .card-platform-icon {
  background: linear-gradient(135deg, rgba(61, 220, 132, 0.12), rgba(0, 200, 83, 0.08));
  color: #3DDC84;
}

.card-ios .card-platform-icon {
  background: linear-gradient(135deg, rgba(100, 100, 100, 0.1), rgba(150, 150, 150, 0.06));
  color: #666;
}

.card-platform-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.card-platform-desc {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.card-platform-tags {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.card-platform-tags span {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 500;
  white-space: nowrap;
}

.card-android .card-platform-tags span {
  background: rgba(61, 220, 132, 0.1);
  color: #2E7D32;
}

.card-ios .card-platform-tags span {
  background: rgba(100, 100, 100, 0.1);
  color: #555;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 40px;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
  min-width: 200px;
}

.btn-android {
  background: linear-gradient(135deg, #3DDC84, #00C853);
  color: #fff;
  box-shadow: 0 4px 14px rgba(61, 220, 132, 0.3);
}

.btn-ios {
  background: linear-gradient(135deg, #444, #222);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.step-warning {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  background: linear-gradient(135deg, #FFF8E1, #FFF3CD);
  border: 1px solid #FFE082;
  border-left: 4px solid #FFA000;
  border-radius: var(--radius-md);
  max-width: 740px;
  margin: 0 auto;
  text-align: left;
  box-shadow: 0 2px 8px rgba(255, 160, 0, 0.08);
}

.warning-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 160, 0, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFA000;
}

.warning-content {
  flex: 1;
  min-width: 0;
}

.warning-content strong {
  display: block;
  font-size: 14px;
  color: #E65100;
  margin-bottom: 8px;
  font-weight: 700;
}

.warning-content p {
  font-size: 13px;
  color: #6D4C00;
  line-height: 1.8;
  margin: 0 !important;
}

.highlight-warn {
  color: #D84315;
  font-weight: 700;
  background: rgba(255, 160, 0, 0.18);
  padding: 2px 6px;
  border-radius: 3px;
  white-space: nowrap;
}

.reviews-section {
  padding: 80px 0;
  background: var(--bg);
  overflow: hidden;
}

.reviews-carousel {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.reviews-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.review-card {
  flex: 0 0 calc(50% - 12px);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.review-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.review-card .review-quote {
  margin-bottom: 16px;
}

.review-card .review-quote img {
  width: 24px;
  height: 24px;
  opacity: 0.2;
}

.review-card .review-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.review-card .review-stars {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
}

.review-card .review-stars img {
  width: 16px;
  height: 16px;
  color: #FFB800;
}

.review-card .review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-card .review-author .ra-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
}

.review-card .review-author .ra-info .ra-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.review-card .review-author .ra-date {
  margin-left: auto;
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-bg);
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  white-space: nowrap;
}

.reviews-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.reviews-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
}

.reviews-arrow:hover {
  background: var(--primary);
  border-color: var(--primary);
}

.reviews-arrow:hover img {
  filter: brightness(0) invert(1);
}

.reviews-arrow img {
  width: 18px;
  height: 18px;
}

.reviews-dots {
  display: flex;
  gap: 8px;
}

.reviews-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: all var(--transition);
}

.reviews-dot.active {
  background: var(--primary);
  width: 24px;
  border-radius: 4px;
}

.footer {
  background: #2D2D3A;
  color: #B0B0C0;
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand .nav-logo {
  margin-bottom: 12px;
  color: #fff;
}

.footer-brand .nav-logo span {
  -webkit-text-fill-color: var(--primary-light);
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  color: #9090A0;
}

.footer-links h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 13px;
  color: #9090A0;
  margin-bottom: 10px;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-8px);
  }
}

@keyframes msgIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes floatCard {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.fade-in-delay-1 {
  transition-delay: 0.1s;
}
.fade-in-delay-2 {
  transition-delay: 0.2s;
}
.fade-in-delay-3 {
  transition-delay: 0.3s;
}
.fade-in-delay-4 {
  transition-delay: 0.4s;
}
.fade-in-delay-5 {
  transition-delay: 0.5s;
}

@media (max-width: 1024px) {
  .screenshot-item {
    width: 260px;
  }

  .screenshot-item img {
    height: 470px;
  }

  .chat-demo-wrapper {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .chat-demo-info {
    text-align: center;
  }

  .chat-demo-features {
    align-items: center;
  }

  .banner .container {
    gap: 32px;
  }

  .banner-float-card.top {
    right: 0;
  }

  .banner-float-card.bottom {
    left: 0;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .container {
    padding: 0 16px;
  }

  .banner {
    min-height: auto;
    padding: calc(var(--nav-height) + 40px) 0 60px;
  }

  .banner .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .banner-content p {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .banner-buttons {
    justify-content: center;
  }

  .banner-phone-mockup {
    width: 220px;
    height: 440px;
  }

  .banner-float-card {
    display: none;
  }

  .screenshot-item {
    width: 240px;
  }

  .screenshot-item img {
    height: 420px;
  }

  .chat-window {
    max-width: 100%;
  }

  .chat-window-body {
    height: 280px;
  }

  .review-card {
    flex: 0 0 calc(100% - 0px);
  }

  .reviews-track {
    gap: 16px;
  }

  .footer {
    padding: 36px 0 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 28px;
  }

  .footer-brand {
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .footer-brand .nav-logo {
    justify-content: center;
    margin-bottom: 10px;
  }

  .footer-brand p {
    font-size: 13px;
    line-height: 1.6;
    color: #888899;
    max-width: 280px;
    margin: 0 auto;
  }

  .footer-links {
    text-align: center;
    padding: 16px 0;
  }

  .footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 14px;
    position: relative;
    display: inline-block;
  }

  .footer-links h4::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
  }

  .footer-links a {
    display: inline-block;
    font-size: 13px;
    color: #888899;
    margin: 6px 12px;
    padding: 4px 10px;
    border-radius: 8px;
    transition: all 0.2s ease;
  }

  .footer-links a:hover {
    color: var(--primary-light);
    background: rgba(255, 77, 109, 0.1);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }

  .footer-bottom span {
    font-size: 12px;
    color: #707080;
  }

  .download-cards {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 28px;
  }

  .download-card {
    padding: 32px 24px 28px;
  }

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

  .card-platform-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
  }

  .card-platform-name {
    font-size: 19px;
  }

  .btn-download {
    min-width: 180px;
    padding: 12px 32px;
    font-size: 15px;
  }

  .step-warning {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 18px;
    gap: 12px;
  }

  .warning-icon {
    width: 36px;
    height: 36px;
  }

  .section-header {
    margin-bottom: 32px;
  }

  .tags-section,
  .features-section,
  .chat-demo-section,
  .tutorial-section,
  .reviews-section {
    padding: 60px 0;
  }
}

@media (max-width: 480px) {
  .banner-phone-mockup {
    width: 180px;
    height: 360px;
  }

  .banner-buttons {
    flex-direction: column;
    align-items: center;
  }

  .tag {
    font-size: 12px;
    padding: 8px 14px;
  }

  .chat-quick-replies {
    justify-content: center;
  }
}

.feedback-btn {
  position: fixed;
  right: 24px;
  bottom: 100px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 30px;
  box-shadow: 0 6px 24px rgba(255, 77, 109, 0.4);
  cursor: pointer;
  z-index: 900;
}

.feedback-btn .icon-svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: #fff;
}

.feedback-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.feedback-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.feedback-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.feedback-content {
  position: relative;
  max-width: 420px;
  width: 90%;
  max-height: 90vh;
  margin: 10% auto;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  transform: scale(0.95) translateY(20px);
  transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
}

.feedback-modal.active .feedback-content {
  transform: scale(1) translateY(0);
}

.feedback-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--primary-bg), #fff);
  border-bottom: 1px solid var(--border);
}

.feedback-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.feedback-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.feedback-close:hover {
  background: var(--primary-bg);
}

.feedback-close i {
  font-size: 18px;
  color: var(--text-secondary);
}

.feedback-form {
  padding: 24px;
}

.feedback-form .form-group {
  margin-bottom: 18px;
}

.feedback-form label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 8px;
}

.feedback-form input,
.feedback-form select,
.feedback-form textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  box-sizing: border-box;
}

.feedback-form input:focus,
.feedback-form select:focus,
.feedback-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 77, 109, 0.1);
}

.feedback-form textarea {
  resize: vertical;
  min-height: 100px;
}

.feedback-form ::placeholder {
  color: #B0B0C0;
}

.feedback-form .btn-full {
  width: 100%;
  margin-top: 8px;
}

.feedback-success {
  display: none;
  flex-direction: column;
  align-items: center;
  padding: 40px 32px;
  text-align: center;
}

.feedback-success.active {
  display: flex;
}

.success-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #10B981, #34D399);
  border-radius: 50%;
  margin-bottom: 20px;
  animation: successPulse 0.6s ease;
}

@keyframes successPulse {
  0% { transform: scale(0); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.success-icon i {
  font-size: 40px;
  color: #fff;
}

.feedback-success h4 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}

.feedback-success p {
  margin: 0 0 24px;
  font-size: 14px;
  color: var(--text-secondary);
}

.feedback-success .btn-secondary {
  background: var(--text-secondary);
}

.feedback-success .btn-secondary:hover {
  background: var(--text);
}

@media (max-width: 768px) {
  .feedback-btn {
    right: 16px;
    bottom: 80px;
    padding: 10px 16px;
    font-size: 13px;
  }

  .feedback-content {
    width: 85%;
    margin: 15% auto;
    border-radius: 16px;
  }

  .feedback-header {
    padding: 16px 20px;
  }

  .feedback-header h3 {
    font-size: 16px;
  }

  .feedback-form {
    padding: 20px;
  }

  .feedback-success {
    padding: 32px 24px;
  }

  .success-icon {
    width: 64px;
    height: 64px;
  }

  .success-icon i {
    font-size: 32px;
  }
}