@charset "UTF-8";

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

:root {
  --c-orange-1: #FFDAC1;
  --c-orange-2: #FFB5A7;
  --c-orange-3: #FFB199;
  --c-orange-4: #FF8A65;
  --c-orange-5: #FF6B4A;
  --c-pink-1: #FFCAD4;
  --c-pink-2: #F8BED0;
  --c-pink-3: #FF6B9D;
  --c-pink-4: #C2185B;
  --c-dark-1: #3c1810;
  --c-dark-2: #5a2a1c;
  --c-dark-3: #6d3b2a;
  --c-bg-light: #FFF3EE;
  --c-white-strong: rgba(255, 255, 255, 0.65);
  --c-white-mid: rgba(255, 255, 255, 0.5);
  --c-white-soft: rgba(255, 255, 255, 0.38);
  --c-white-border: rgba(255, 255, 255, 0.7);
  --c-dark-soft-border: rgba(90, 42, 28, 0.12);
  --shadow-soft: 0 16px 40px rgba(255, 120, 90, 0.18);
  --shadow-card: 0 22px 50px rgba(255, 120, 90, 0.20);
  --shadow-deep: 0 30px 70px rgba(255, 120, 90, 0.28);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --max-width: 1200px;
  --header-h: 80px;
  --ease: all 0.32s cubic-bezier(.25,.8,.25,1);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-dark-2);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

body * {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

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

a,
button {
  -webkit-tap-highlight-color: transparent;
  background: transparent;
}

ul {
  list-style: none;
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

i.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

i.icon-home {
  background-image: url("../icons/home.svg");
  width: 18px;
  height: 18px;
}

i.icon-product {
  background-image: url("../icons/product.svg");
  width: 18px;
  height: 18px;
}

i.icon-version {
  background-image: url("../icons/version.svg");
  width: 18px;
  height: 18px;
}

i.icon-device {
  background-image: url("../icons/device.svg");
  width: 18px;
  height: 18px;
}

i.icon-faq {
  background-image: url("../icons/faq.svg");
  width: 18px;
  height: 18px;
}

i.icon-star {
  background-image: url("../icons/star.svg");
  width: 14px;
  height: 14px;
}

i.icon-menu {
  background-image: url("../icons/menu.svg");
  width: 22px;
  height: 22px;
}

i.icon-close {
  background-image: url("../icons/close.svg");
  width: 22px;
  height: 22px;
}

i.icon-download {
  background-image: url("../icons/download.svg");
  width: 18px;
  height: 18px;
}

i.icon-arrow-right {
  background-image: url("../icons/arrow-right.svg");
  width: 14px;
  height: 14px;
}

i.icon-arrow-left {
  background-image: url("../icons/arrow-left.svg");
  width: 14px;
  height: 14px;
}

i.icon-arrow-up {
  background-image: url("../icons/arrow-up.svg");
  width: 22px;
  height: 22px;
}

i.icon-user {
  background-image: url("../icons/user.svg");
  width: 18px;
  height: 18px;
}

i.icon-message {
  background-image: url("../icons/message.svg");
  width: 18px;
  height: 18px;
}

i.icon-phone {
  background-image: url("../icons/phone.svg");
  width: 18px;
  height: 18px;
}

i.icon-email {
  background-image: url("../icons/email.svg");
  width: 18px;
  height: 18px;
}

i.icon-settings {
  background-image: url("../icons/settings.svg");
  width: 22px;
  height: 22px;
}

i.icon-file {
  background-image: url("../icons/file.svg");
  width: 22px;
  height: 22px;
}

i.icon-check {
  background-image: url("../icons/check.svg");
  width: 18px;
  height: 18px;
}

i.icon-circle {
  background-image: url("../icons/circle.svg");
  width: 18px;
  height: 18px;
}

i.icon-shield {
  background-image: url("../icons/shield.svg");
  width: 22px;
  height: 22px;
}

i.icon-lightning {
  background-image: url("../icons/lightning.svg");
  width: 22px;
  height: 22px;
}

i.icon-palette {
  background-image: url("../icons/palette.svg");
  width: 22px;
  height: 22px;
}

i.icon-layers {
  background-image: url("../icons/layers.svg");
  width: 22px;
  height: 22px;
}

i.icon-zap {
  background-image: url("../icons/zap.svg");
  width: 22px;
  height: 22px;
}

i.icon-sliders {
  background-image: url("../icons/sliders.svg");
  width: 22px;
  height: 22px;
}

i.icon-clock {
  background-image: url("../icons/clock.svg");
  width: 18px;
  height: 18px;
}

i.icon-chevron-up {
  background-image: url("../icons/chevron-up.svg");
  width: 16px;
  height: 16px;
}

i.icon-chevron-down {
  background-image: url("../icons/chevron-down.svg");
  width: 16px;
  height: 16px;
}

.site-wrap {
  position: relative;
  min-height: 100vh;
  background:
    radial-gradient(1200px 700px at 85% -10%, var(--c-orange-3) 0%, transparent 62%),
    radial-gradient(1000px 620px at -10% 32%, var(--c-pink-1) 0%, transparent 58%),
    radial-gradient(900px 800px at 50% 120%, var(--c-orange-1) 0%, transparent 62%),
    linear-gradient(135deg, var(--c-orange-1) 0%, var(--c-orange-2) 40%, var(--c-pink-2) 100%);
}

.site-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(60px);
  -webkit-backdrop-filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.site-wrap > * {
  position: relative;
  z-index: 1;
}

.site-wrap .page-body {
  position: relative;
  z-index: 2;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  transition: var(--ease);
}

.header .header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.header.scrolled {
  background: rgba(255, 218, 193, 0.55);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--c-white-soft);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-dark-2);
  cursor: pointer;
}

.logo .logo-img-box {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--c-white-strong);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 6px 22px rgba(255, 120, 90, 0.18);
  border: 1px solid var(--c-white-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.logo .logo-img-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 10px;
}

.logo .brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--c-dark-1);
}

.logo .brand em {
  font-style: normal;
  background: linear-gradient(135deg, var(--c-orange-5) 0%, var(--c-pink-4) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu > li > a {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-dark-2);
  transition: var(--ease);
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
  background: var(--c-white-mid);
  color: var(--c-dark-1);
  box-shadow: 0 6px 18px rgba(255, 120, 90, 0.14);
}

.nav-menu > li > a.active {
  background: rgba(255, 255, 255, 0.7);
}

.nav-cta {
  padding: 12px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--c-orange-5), var(--c-orange-4));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(255, 107, 74, 0.35);
  transition: var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(255, 107, 74, 0.42);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--c-white-mid);
  border: 1px solid var(--c-white-border);
  color: var(--c-dark-1);
}

.hero {
  padding-top: calc(var(--header-h) + 50px);
  padding-bottom: 80px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero .tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--c-white-mid);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--c-white-border);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-pink-4);
  margin-bottom: 22px;
}

.hero .tag .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-orange-5);
}

.hero h1 {
  font-size: 60px;
  font-weight: 800;
  line-height: 1.12;
  color: var(--c-dark-1);
  letter-spacing: -1px;
  margin-bottom: 22px;
}

.hero h1 .grad {
  background: linear-gradient(135deg, #FF5722 0%, #FF6B9D 60%, var(--c-pink-4) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .desc {
  font-size: 17px;
  line-height: 1.9;
  color: var(--c-dark-3);
  margin-bottom: 36px;
  max-width: 540px;
}

.download-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 15px 26px;
  border-radius: 18px;
  background: var(--c-white-strong);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--c-white-border);
  box-shadow: var(--shadow-soft);
  color: var(--c-dark-1);
  min-width: 210px;
  transition: var(--ease);
  text-decoration: none;
}

.dl-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.dl-btn.primary {
  background: linear-gradient(135deg, var(--c-dark-1), var(--c-dark-2));
  color: #FFE8DE;
  border-color: rgba(255, 255, 255, 0.15);
}

.dl-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 6px;
}

.dl-btn .dl-icon {
  background: linear-gradient(135deg, #6D3B2A, #3C1810);
}

.dl-btn .dl-icon.icon-android {
  background: linear-gradient(135deg, #4CAF50, #2E7D32);
}

.dl-btn .dl-icon.icon-ios {
  background: linear-gradient(135deg, #4A4A4A, #1A1A1A);
}

.dl-btn.primary .dl-icon {
  background: linear-gradient(135deg, #FFDAC1, #FFB5A7);
}

.dl-btn.primary .dl-icon.icon-android {
  background: linear-gradient(135deg, #66BB6A, #2E7D32);
}

.dl-btn.primary .dl-icon.icon-ios {
  background: linear-gradient(135deg, #FFE8DE, #F8BED0);
}

.dl-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.dl-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.dl-text small {
  font-size: 11px;
  opacity: 0.75;
  font-weight: 400;
}

.dl-text b {
  font-size: 15px;
  font-weight: 700;
}

.stats {
  display: flex;
  gap: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--c-dark-soft-border);
}

.stat strong {
  display: block;
  font-size: 30px;
  font-weight: 800;
  color: var(--c-pink-4);
  letter-spacing: -1px;
}

.stat span {
  font-size: 13px;
  color: var(--c-dark-3);
  opacity: 0.85;
}

.hero-right {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 30px 0;
}

.float-card {
  position: absolute;
  background: var(--c-white-strong);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--c-white-border);
  border-radius: 18px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-soft);
  animation: bob 3.5s ease-in-out infinite;
  z-index: 2;
}

.float-card.c1 {
  top: 50px;
  left: 20px;
  animation-delay: 0s;
}

.float-card.c2 {
  bottom: 100px;
  right: 0;
  animation-delay: 1.2s;
}

.float-card .fc-icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--c-orange-4), var(--c-pink-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
}

.float-card .fc-txt b {
  display: block;
  font-size: 14px;
  color: var(--c-dark-1);
}

.float-card .fc-txt span {
  font-size: 12px;
  color: var(--c-dark-3);
  opacity: 0.8;
}

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

.phone {
  width: 280px;
  height: 560px;
  border-radius: 46px;
  background: linear-gradient(160deg, var(--c-dark-1), var(--c-dark-2) 60%, var(--c-dark-1));
  padding: 18px;
  box-shadow: 0 35px 70px rgba(60, 24, 16, 0.45), inset 0 0 0 2px rgba(255, 255, 255, 0.08);
  position: relative;
}

.phone::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 28px;
  background: var(--c-dark-1);
  border-radius: 0 0 20px 20px;
  z-index: 3;
}

.screen {
  width: 100%;
  height: 100%;
  border-radius: 34px;
  overflow: hidden;
  position: relative;
  background: linear-gradient(180deg, var(--c-orange-1), var(--c-orange-2) 40%, var(--c-pink-2));
}

.screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 34px;
}

.screen .app {
  padding: 52px 16px 16px;
  color: var(--c-dark-1);
}

.screen .app h4 {
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.screen .app h4::after {
  content: "";
  width: 22px;
  height: 22px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--c-orange-5), var(--c-pink-4));
  box-shadow: 0 4px 10px rgba(255, 107, 74, 0.3);
}

.s-search {
  margin-top: 0;
  background: var(--c-white-mid);
  border-radius: 14px;
  padding: 10px 14px;
  font-size: 12px;
  color: var(--c-dark-3);
  opacity: 0.85;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.s-cats {
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;
  overflow: hidden;
  margin-bottom: 12px;
}

.s-cats span {
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--c-white-mid);
  font-size: 11px;
  color: var(--c-dark-1);
  font-weight: 600;
  white-space: nowrap;
}

.s-cats span.a {
  background: linear-gradient(135deg, var(--c-orange-5), var(--c-pink-4));
  color: #fff;
}

.s-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.s-card {
  background: rgba(255, 255, 255, 0.85);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(60, 24, 16, 0.12);
}

.s-card .cover {
  height: 100px;
  background: linear-gradient(135deg, var(--c-orange-3), var(--c-pink-2));
  position: relative;
}

.s-card .cover.b { background: linear-gradient(135deg, var(--c-pink-2), var(--c-pink-1)); }
.s-card .cover.c { background: linear-gradient(135deg, var(--c-orange-1), var(--c-orange-3)); }
.s-card .cover.d { background: linear-gradient(135deg, var(--c-pink-3), var(--c-orange-3)); }

.s-card .cover::after {
  content: "";
  position: absolute;
  bottom: 8px;
  left: 8px;
  right: 8px;
  height: 8px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 4px;
}

.s-card .meta {
  padding: 8px 10px;
}

.s-card .t {
  font-size: 11px;
  font-weight: 700;
  color: var(--c-dark-1);
  height: 14px;
  background: rgba(60, 24, 16, 0.1);
  border-radius: 3px;
  margin-bottom: 5px;
}

.s-card .s {
  font-size: 10px;
  color: var(--c-dark-3);
  opacity: 0.8;
  height: 10px;
  width: 60%;
  background: rgba(60, 24, 16, 0.08);
  border-radius: 2px;
}

.section {
  padding: 90px 0;
}

.sec-head {
  text-align: center;
  margin-bottom: 56px;
}

.sec-head .st {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-pink-4);
  letter-spacing: 3px;
  margin-bottom: 10px;
}

.sec-head h2 {
  font-size: 40px;
  font-weight: 800;
  color: var(--c-dark-1);
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.sec-head p {
  font-size: 16px;
  color: var(--c-dark-3);
}

.feat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px;
}

.feat {
  background: var(--c-white-soft);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--c-white-border);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-card);
  transition: var(--ease);
  position: relative;
  overflow: hidden;
}

.feat::before {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255, 107, 74, 0.18), rgba(248, 190, 208, 0.28));
}

.feat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-deep);
}

.feat .ic {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  margin-bottom: 22px;
  position: relative;
  background: linear-gradient(135deg, var(--c-orange-4), var(--c-pink-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 10px 28px rgba(255, 107, 74, 0.28);
}

.feat:nth-child(2) .ic { background: linear-gradient(135deg, var(--c-orange-3), var(--c-pink-3)); }
.feat:nth-child(3) .ic { background: linear-gradient(135deg, var(--c-orange-1), var(--c-orange-4)); }
.feat:nth-child(4) .ic { background: linear-gradient(135deg, var(--c-pink-2), var(--c-pink-4)); }

.feat h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--c-dark-1);
  margin-bottom: 10px;
  position: relative;
}

.feat p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-dark-3);
  position: relative;
}

.downloads-section {
  padding-top: 40px;
  padding-bottom: 120px;
}

.dl-box {
  background: var(--c-white-mid);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--c-white-border);
  border-radius: 32px;
  padding: 60px 60px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 40px;
  align-items: center;
  box-shadow: var(--shadow-deep);
  position: relative;
  overflow: hidden;
}

.dl-box::after {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 74, 0.35), transparent 70%);
  top: -160px;
  right: -160px;
}

.dl-box h2 {
  font-size: 38px;
  font-weight: 800;
  color: var(--c-dark-1);
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  position: relative;
  line-height: 1.25;
}

.dl-box h2 em {
  font-style: normal;
  background: linear-gradient(135deg, #FF5722, var(--c-pink-4));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dl-box p {
  font-size: 16px;
  color: var(--c-dark-3);
  line-height: 1.85;
  position: relative;
  margin-bottom: 28px;
  max-width: 520px;
}

.big-dl {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
}

.big-dl .dl-btn {
  padding: 20px 30px;
  min-width: 240px;
  border-radius: 22px;
}

.phone-side {
  position: relative;
  display: flex;
  justify-content: center;
  height: 360px;
}

.phone-side .phone {
  width: 220px;
  height: 440px;
  transform: rotate(-6deg) translateY(-40px);
}

.foot {
  padding: 40px 0 50px;
  border-top: 1px solid var(--c-dark-soft-border);
}

.foot .foot-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.f-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-dark-2);
  font-weight: 700;
}

.f-logo .logo-mini {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--c-white-strong);
  border: 1px solid var(--c-white-border);
  padding: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.f-logo .logo-mini img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.f-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.f-links a {
  font-size: 14px;
  color: var(--c-dark-3);
  text-decoration: none;
  transition: var(--ease);
}

.f-links a:hover {
  color: var(--c-pink-4);
}

.copy {
  font-size: 13px;
  color: var(--c-dark-3);
  opacity: 0.75;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-orange-5), var(--c-pink-4));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(255, 107, 74, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: var(--ease);
  z-index: 190;
}

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

.back-to-top:hover {
  transform: translateY(-3px);
}

@media (max-width: 1100px) {
  :root { --header-h: 72px; }
  .container { padding: 0 28px; }
  .header .header-inner { padding: 14px 28px; }
  .hero { padding-top: calc(var(--header-h) + 40px); padding-bottom: 60px; }
  .hero .container { grid-template-columns: 1fr 1fr; gap: 40px; }
  .hero h1 { font-size: 48px; }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .phone { width: 240px; height: 480px; }
  .float-card.c1 { left: 0; }
  .float-card.c2 { right: 0; }
  .dl-box { padding: 48px 44px; }
  .dl-box h2 { font-size: 32px; }
  .foot .foot-inner { padding: 0 28px; }
}

@media (max-width: 820px) {
  :root { --header-h: 66px; }
  .container { padding: 0 22px; }
  .header .header-inner { padding: 12px 22px; }
  .hero { padding-top: calc(var(--header-h) + 36px); padding-bottom: 50px; }
  .hero .container { grid-template-columns: 1fr; gap: 50px; text-align: center; }
  .hero h1 { font-size: 42px; }
  .hero .desc { margin-left: auto; margin-right: auto; }
  .download-row { justify-content: center; }
  .stats { justify-content: center; gap: 30px; flex-wrap: wrap; }
  .hero-right { order: -1; }
  .section { padding: 70px 0; }
  .sec-head h2 { font-size: 32px; }
  .feat-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .feat { padding: 26px 22px; }
  .downloads-section { padding-bottom: 90px; }
  .dl-box { grid-template-columns: 1fr; gap: 30px; padding: 40px 34px; text-align: center; }
  .dl-box p { margin-left: auto; margin-right: auto; }
  .big-dl { justify-content: center; }
  .phone-side { height: 320px; }
  .phone-side .phone { transform: rotate(-4deg) translateY(-20px); }
  .foot .foot-inner { padding: 0 22px; flex-direction: column; text-align: center; }
}

@media (max-width: 640px) {
  :root { --header-h: 60px; }
  body { font-size: 15px; }
  .container { padding: 0 18px; }
  .header .header-inner { padding: 10px 18px; }

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

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 16px;
    background: rgba(255, 230, 220, 0.95);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    padding: 20px 18px 24px;
    border-bottom: 1px solid var(--c-white-soft);
    transform: translateY(-16px);
    opacity: 0;
    visibility: hidden;
    transition: var(--ease);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    align-items: stretch;
  }
  .nav.open { transform: translateY(0); opacity: 1; visibility: visible; }

  .nav-menu {
    flex-direction: column;
    gap: 4px;
    align-items: stretch;
  }
  .nav-menu > li > a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }
  .nav-cta { justify-content: center; width: 100%; }

  .hero { padding-top: calc(var(--header-h) + 28px); padding-bottom: 40px; }
  .hero h1 { font-size: 32px; }
  .hero .desc { font-size: 15px; }
  .download-row { flex-direction: column; align-items: stretch; }
  .download-row .dl-btn { min-width: 0; width: 100%; justify-content: center; }
  .stats { gap: 24px; }
  .stat strong { font-size: 24px; }

  .phone { width: 220px; height: 440px; border-radius: 40px; }
  .float-card { padding: 10px 14px; }
  .float-card .fc-icon { width: 36px; height: 36px; border-radius: 12px; font-size: 16px; }
  .float-card.c1 { left: -6px; top: 30px; }
  .float-card.c2 { right: -6px; bottom: 80px; }

  .section { padding: 56px 0; }
  .sec-head { margin-bottom: 38px; }
  .sec-head h2 { font-size: 26px; }

  .feat-grid { display: flex; flex-wrap: nowrap; grid-template-columns: none; gap: 14px; overflow-x: auto; padding: 4px 4px 18px; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; }
  .feat-grid::-webkit-scrollbar { display: none; }
  .feat-grid > .feat { flex: 0 0 calc((100% - 14px * 3) / 4); min-width: calc((100% - 14px * 3) / 4); padding: 22px 16px; border-radius: var(--radius-md); scroll-snap-align: start; }
  .feat .ic { width: 48px; height: 48px; border-radius: 14px; margin-bottom: 16px; }
  .feat .ic i { width: 18px; height: 18px; }
  .feat h3 { font-size: 16px; margin-bottom: 8px; }
  .feat p { font-size: 12px; line-height: 1.75; }

  .dl-box { padding: 34px 22px 60px; border-radius: var(--radius-md); overflow: visible; }
  .dl-box h2 { font-size: 26px; }
  .big-dl { flex-direction: column; align-items: stretch; }
  .big-dl .dl-btn { min-width: 0; width: 100%; justify-content: center; }

  .phone-side { height: auto; overflow: visible; padding-top: 10px; }
  .phone-side .phone {
    width: 100%;
    max-width: 240px;
    height: 480px;
    transform: none;
    margin: 0 auto;
  }
  .phone-side .phone .screen img { object-fit: contain; background: #fff; }

  .back-to-top { bottom: 20px; right: 20px; width: 46px; height: 46px; }
}