@charset "utf-8";

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

:root {
  --primary: #3498ff;
  --primary-dark: #2980db;
  --primary-light: #5dade2;
  --bg-start: #e8f4fd;
  --bg-mid: #d6eaf8;
  --bg-end: #c5dff5;
  --white: #ffffff;
  --text: #2c3e50;
  --text-light: #5a6d7e;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 20px rgba(52, 152, 255, 0.12);
  --shadow-hover: 0 8px 32px rgba(52, 152, 255, 0.2);
  --max-width: 1200px;
  --nav-height: 68px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--bg-start);
  -webkit-tap-highlight-color: transparent;
}

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

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.bg-animated {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.bg-animated::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(52, 152, 255, 0.15) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 60%, rgba(93, 173, 226, 0.12) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 80%, rgba(52, 152, 255, 0.08) 0%, transparent 50%);
  animation: bgFlow 12s ease-in-out infinite;
}

.bg-animated::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(52, 152, 255, 0.06) 0%, transparent 40%, rgba(93, 173, 226, 0.05) 70%, transparent 100%);
  animation: bgShimmer 8s ease-in-out infinite alternate;
}

@keyframes bgFlow {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2%, -1%) rotate(1deg); }
  50% { transform: translate(-1%, 2%) rotate(-1deg); }
  75% { transform: translate(1%, -2%) rotate(0.5deg); }
}

@keyframes bgShimmer {
  0% { opacity: 0.5; }
  100% { opacity: 1; }
}
.aiarticle-comment-rating-icon{
    display:inline-block !important;
    width:auto !important;
    height:auto !important;
    margin-right:2px;
    color:#ffb400 !important;
    font-style:normal !important;
    font-weight:normal !important;
    line-height:1 !important;
    vertical-align:middle;
    text-decoration:none !important;
}

.aiarticle-comment-rating-icon:before{
    font-family:Arial,"Segoe UI Symbol","Noto Sans Symbols","Microsoft YaHei",sans-serif !important;
    font-style:normal !important;
    font-weight:normal !important;
    line-height:1 !important;
}

.aiarticle-comment-rating-icon.fa-star:before{
    content:"\2605" !important;
}

.aiarticle-comment-rating-icon.fa-star-o:before{
    content:"\2606" !important;
}

.aiarticle-comment-rating-icon:last-child{
    margin-right:0;
}
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(52, 152, 255, 0.1);
  will-change: transform;
  transform: translateZ(0);
}

.header.scrolled {
  box-shadow: 0 2px 20px rgba(52, 152, 255, 0.15);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
}

.logo-link img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

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

.nav-menu li a {
  display: block;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.95rem;
  color: var(--text);
  transition: all 0.25s;
}

.nav-menu li a:hover {
  color: var(--primary);
  background: rgba(52, 152, 255, 0.08);
}

.nav-download-btn {
  display: none;
  padding: 6px 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  width: 28px;
  height: 20px;
  justify-content: center;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + 30px);
  position: relative;
  overflow: hidden;
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-content {
  flex: 1;
  max-width: 520px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(52, 152, 255, 0.1);
  border: 1px solid rgba(52, 152, 255, 0.2);
  border-radius: 20px;
  color: var(--primary);
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  box-shadow: 0 4px 16px rgba(52, 152, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(52, 152, 255, 0.45);
}

.btn-outline {
  background: var(--white);
  color: var(--primary);
  border: 2px solid rgba(52, 152, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(52, 152, 255, 0.04);
  transform: translateY(-2px);
}

.btn .icon-android,
.btn .icon-ios {
  width: 22px;
  height: 22px;
  display: inline-block;
}

.btn-primary .icon-android {
  filter: brightness(0) invert(1);
}

.btn-primary .icon-ios {
  filter: brightness(0) invert(1);
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  animation: float 5s ease-in-out infinite;
}

.phone-frame {
  width: 280px;
  height: 560px;
  background: var(--white);
  border-radius: 36px;
  border: 3px solid #e0e0e0;
  box-shadow: 0 12px 40px rgba(52, 152, 255, 0.18), inset 0 0 0 2px #f5f5f5;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.phone-notch {
  width: 100px;
  height: 24px;
  background: #e8e8e8;
  border-radius: 0 0 18px 18px;
  margin: 0 auto;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.phone-screen {
  flex: 1;
  padding: 28px 20px 16px;
  background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.phone-app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.phone-app-dots {
  color: #aaa;
  letter-spacing: 2px;
}

.phone-logo-area {
  text-align: center;
  margin-bottom: 22px;
}

.phone-logo-circle {
  width: 66px;
  height: 66px;
  border-radius: 18px;
  overflow: hidden;
  margin: 0 auto 10px;
  box-shadow: 0 4px 16px rgba(52, 152, 255, 0.2);
}

.phone-logo-circle img {
  width: 66px;
  height: 66px;
  object-fit: cover;
  animation: none;
  filter: none;
}

.phone-app-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.phone-app-slogan {
  font-size: 0.72rem;
  color: var(--text-light);
}

.phone-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.phone-input {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: #f2f6fc;
  border-radius: 12px;
  font-size: 0.78rem;
  color: #b0b0b0;
  position: relative;
}

.phone-code-btn {
  position: absolute;
  right: 14px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.74rem;
  white-space: nowrap;
}

.phone-login-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  text-align: center;
  padding: 13px;
  border-radius: 26px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(52, 152, 255, 0.3);
}

.phone-agreement {
  text-align: center;
  font-size: 0.65rem;
  color: #bbb;
  margin-top: 14px;
  line-height: 1.5;
}

.phone-home-bar {
  width: 80px;
  height: 5px;
  background: #ccc;
  border-radius: 3px;
  margin: 8px auto;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.hero-stats {
  display: flex;
  gap: 30px;
  margin-top: 28px;
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-light);
}

.hero-update {
  margin-top: 16px;
  font-size: 0.82rem;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-update::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #2ecc71;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  padding: 4px 16px;
  background: rgba(52, 152, 255, 0.1);
  border-radius: 20px;
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-light);
}

.screenshots-section {
  background: rgba(255, 255, 255, 0.3);
}

.screenshots-wrapper {
  position: relative;
  overflow: hidden;
}

.screenshots-track {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  cursor: grab;
  padding: 10px 0 20px;
  scrollbar-width: none;
}

.screenshots-track::-webkit-scrollbar {
  display: none;
}

.screenshots-track:active {
  cursor: grabbing;
}

.screenshot-card {
  flex: 0 0 260px;
  scroll-snap-align: start;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  background: var(--white);
}

.screenshot-card img {
  width: 260px;
  height: 460px;
  object-fit: cover;
  display: block;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 22px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.35s;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transition: transform 0.35s;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, rgba(52, 152, 255, 0.1), rgba(93, 173, 226, 0.1));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon i {
  display: block;
  width: 28px;
  height: 28px;
}

.icon-book { background: url('../images/icon-book.svg') center/contain no-repeat; }
.icon-palette { background: url('../images/icon-palette.svg') center/contain no-repeat; }
.icon-lightning { background: url('../images/icon-lightning.svg') center/contain no-repeat; }
.icon-moon { background: url('../images/icon-moon.svg') center/contain no-repeat; }
.icon-download { background: url('../images/icon-download.svg') center/contain no-repeat; }
.icon-bell { background: url('../images/icon-bell.svg') center/contain no-repeat; }
.icon-tag { background: url('../images/icon-tag.svg') center/contain no-repeat; }
.icon-chat { background: url('../images/icon-chat.svg') center/contain no-repeat; }

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.7;
}

.about-section {
  background: var(--white);
}

.about-content {
  display: flex;
  align-items: center;
  gap: 60px;
}

.about-text {
  flex: 1;
}

.about-text h2 {
  font-size: 1.8rem;
  margin-bottom: 18px;
  color: var(--text);
}

.about-text p {
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 12px;
  font-size: 0.98rem;
}

.about-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.about-image img {
  max-width: 280px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.about-highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(52, 152, 255, 0.04);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--text);
}

.about-highlight-item .hl-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}

.special-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.special-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  border: 1px solid transparent;
}

.special-card:hover {
  border-color: rgba(52, 152, 255, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.special-card .special-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(52, 152, 255, 0.12), rgba(93, 173, 226, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.special-card .special-icon i {
  display: block;
  width: 24px;
  height: 24px;
}

.icon-scroll { background: url('../images/icon-scroll.svg') center/contain no-repeat; }
.icon-target { background: url('../images/icon-target.svg') center/contain no-repeat; }
.icon-note { background: url('../images/icon-note.svg') center/contain no-repeat; }
.icon-users { background: url('../images/icon-users.svg') center/contain no-repeat; }
.icon-chart { background: url('../images/icon-chart.svg') center/contain no-repeat; }
.icon-sync { background: url('../images/icon-sync.svg') center/contain no-repeat; }
.icon-back-arrow { background: url('../images/icon-back-arrow.svg') center/contain no-repeat; width: 18px; height: 18px; display: block; }
.icon-phone-user { background: url('../images/icon-phone-user.svg') center/contain no-repeat; width: 18px; height: 18px; display: block; flex-shrink: 0; }
.icon-phone-lock { background: url('../images/icon-phone-lock.svg') center/contain no-repeat; width: 18px; height: 18px; display: block; flex-shrink: 0; }

.special-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.special-card p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.7;
}

.reviews-section {
  background: rgba(255, 255, 255, 0.4);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.review-stars {
  color: #ffb800;
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.review-text {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 14px;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 0.8rem;
  font-weight: 700;
}

.review-name {
  font-size: 0.88rem;
  font-weight: 600;
}

.review-date {
  font-size: 0.75rem;
  color: var(--text-light);
}

.updates-section {
  background: var(--white);
}

.updates-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.update-item {
  display: flex;
  gap: 20px;
  padding: 18px 24px;
  background: rgba(52, 152, 255, 0.03);
  border-radius: var(--radius);
  transition: all 0.3s;
  border: 1px solid transparent;
}

.update-item:hover {
  border-color: rgba(52, 152, 255, 0.15);
  background: rgba(52, 152, 255, 0.05);
}

.update-version {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 0.9rem;
}

.update-info h3 {
  font-size: 1rem;
  margin-bottom: 2px;
}

.update-date {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-bottom: 8px;
}

.update-details {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.7;
  padding-left: 0;
}

.update-details li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 4px;
}

.update-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all 0.3s;
}

.faq-question {
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.98rem;
  user-select: none;
}

.faq-arrow {
  width: 20px;
  height: 20px;
  transition: transform 0.3s;
  flex-shrink: 0;
  position: relative;
}

.faq-arrow::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: translate(-50%, -75%) rotate(45deg);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding: 0 24px 18px;
}

.download-section {
  background: linear-gradient(180deg, rgba(52, 152, 255, 0.04), rgba(255, 255, 255, 0));
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  max-width: 760px;
  margin: 0 auto;
}

.download-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  border: 1px solid transparent;
  position: relative;
}

.download-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(52, 152, 255, 0.2);
}

.download-card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, rgba(52, 152, 255, 0.1), rgba(93, 173, 226, 0.1));
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card-icon i {
  width: 32px;
  height: 32px;
  display: block;
}

.download-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text);
}

.download-card-desc {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 14px;
}

.download-card-info {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
  font-size: 0.8rem;
  color: var(--text-light);
}

.download-btn {
  width: 100%;
  justify-content: center;
}

.download-card-note {
  margin-top: 10px;
  font-size: 0.75rem;
  color: #f39c12;
}

.footer {
  background: linear-gradient(180deg, #1a2a3a, #152535);
  color: rgba(255, 255, 255, 0.7);
  padding: 50px 0 30px;
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.footer-brand span {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
}

.footer-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer h4 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links li a {
  font-size: 0.85rem;
  transition: color 0.2s;
}

.footer-links li 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: center;
  align-items: center;
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s;
}

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

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  box-shadow: 0 4px 16px rgba(52, 152, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.35s;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(52, 152, 255, 0.5);
}

.icon-top {
  width: 20px;
  height: 20px;
  display: block;
  background: url('../images/top.svg') center/contain no-repeat;
}

.icon-android {
  width: 22px;
  height: 22px;
  display: inline-block;
  background: url('../images/android.svg') center/contain no-repeat;
}

.icon-ios {
  width: 22px;
  height: 22px;
  display: inline-block;
  background: url('../images/ios.svg') center/contain no-repeat;
}

@media (max-width: 1024px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-title {
    font-size: 2.4rem;
  }

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

  .hero-stats {
    justify-content: center;
  }

  .hero-update {
    justify-content: center;
  }

  .hero-visual {
    margin-top: 30px;
  }

  .about-content {
    flex-direction: column;
    text-align: center;
  }

  .about-highlights {
    text-align: left;
  }

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

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

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

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

@media (max-width: 768px) {
  .nav-download-btn {
    display: block;
  }

  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 75%;
    max-width: 320px;
    height: 100vh;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 90px 30px 30px;
    gap: 6px;
    transition: right 0.35s ease;
    box-shadow: -4px 0 30px rgba(0, 0, 0, 0.08);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu li a {
    font-size: 1rem;
    padding: 12px 16px;
    border-radius: 12px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-visual {
    margin-top: 30px;
  }

  .phone-frame {
    width: 240px;
    height: 480px;
  }

  .phone-screen {
    padding: 24px 16px 12px;
  }

  .phone-input {
    padding: 10px 12px;
    font-size: 0.72rem;
  }

  .phone-login-btn {
    padding: 11px;
    font-size: 0.82rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .features-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .special-grid {
    grid-template-columns: 1fr;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .footer-grid > div:first-child {
    grid-column: 1 / -1;
  }

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

  .about-highlights {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.7rem;
  }

  .hero-desc {
    font-size: 0.9rem;
  }

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

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    gap: 14px;
  }

  .hero-stat .num {
    font-size: 1.2rem;
  }

  .phone-frame {
    width: 220px;
    height: 460px;
  }

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

  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .back-to-top {
    right: 16px;
    bottom: 20px;
    width: 40px;
    height: 40px;
  }

  .update-item {
    flex-direction: column;
    gap: 12px;
  }

  .faq-question {
    font-size: 0.9rem;
    padding: 15px 18px;
  }

  .faq-answer {
    padding: 0 18px;
  }

  .faq-item.active .faq-answer {
    padding: 0 18px 15px;
  }
}