:root {
  --bg: #eaf1ff;
  --text: #111827;
  --muted: #5b6580;
  --brand: #1e5eff;
  --brand-2: #40b9ff;
  --deep: #0d1a74;
  --card: #ffffff;
  --radius: 20px;
  --shadow: 0 16px 44px rgba(18, 40, 123, 0.14);
  --nav-h: 82px;
}

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

html,
body {
  height: 100%;
  scroll-behavior: smooth;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

.container {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.site-header {
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  transition: all 0.35s ease;
  padding: 0;
}
.site-header .container {
  width: 100%;
  max-width: none;
  margin: 0;
  background: transparent;
  border-bottom: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 0;
  height: 60px;
  padding: 0 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.35s ease;
  position: relative;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.site-header.scrolled {
}

.site-header.scrolled .container {
  background: rgba(255,255,255,.5);
  backdrop-filter: blur(20px) saturate(190%);
  -webkit-backdrop-filter: blur(20px) saturate(190%);
  width:100%;
  height: 60px;
  padding: 0 72px;
  border-bottom: 1px solid rgba(189, 212, 255, 0.82);
  box-shadow: 0 10px 28px rgba(20, 56, 130, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.62);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #ffffff;
  font-weight: 600;
  font-size: 20px;
}

.brand img {
  width: 58px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 3px 7px rgba(0, 0, 0, 0.2));
}

.site-header.scrolled .brand {
  color: #0f2f8f;
}

.site-header.scrolled .brand img {
  filter: brightness(0) saturate(100%) invert(14%) sepia(69%) saturate(2018%) hue-rotate(216deg) brightness(88%) contrast(101%);
}

.main-nav {
  display: flex;
  gap: 62px;
  align-items: center;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.main-nav a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.2px;
  transition: color 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.nav-trigger {
  /* only override trigger color/typography for index page */
  color: rgba(255, 255, 255, 0.95);
  font-size: 16px;
  font-weight: 500;
}

.main-nav a .iconfont {
  display: none;
}

.site-header.scrolled .main-nav a {
  color: #1b2b67;
}

.site-header.scrolled .nav-trigger {
  color: #1b2b67;
}

.nav-arrow {
  width: 8px;
  height: 8px;
  border-right: 1.8px solid currentColor;
  border-bottom: 1.8px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0.95;
}

.main-nav a:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

.nav-trigger:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

.site-header.scrolled .main-nav a:hover {
  color: var(--brand);
  text-shadow: none;
}

.site-header.scrolled .nav-trigger:hover {
  color: var(--brand);
  text-shadow: none;
}

.login-btn {
  border: 0;
  height: 38px;
  padding: 0 20px;
  border-radius: 999px;
  background: #121f67;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 8px;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(13, 26, 116, 0.35);
}

.hero {
  height: 100vh;
  min-height: 760px;
  position: relative;
  overflow: hidden;
  padding-top: 0;
  background: url("img/headerbg.jpg") center top / cover no-repeat;
  isolation: isolate;
}

.hero::before {
  /*content: "";*/
  /*position: absolute;*/
  /*inset: 0;*/
  /*background: radial-gradient(circle at 50% 26%, rgba(255, 255, 255, 0.36), rgba(11, 102, 255, 0.15) 34%, rgba(5, 59, 188, 0.4) 100%);*/
  /*z-index: 1;*/
}

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

.hero-content {
  max-width: 980px;
  margin: 72px auto 0;
  text-align: center;
  color: #fff;
  position: relative;
  z-index: 3;
}

.hero h1 {
  font-size: clamp(52px, 6.2vw, 72px);
  line-height: 1.3;
  letter-spacing: 1px;
  text-shadow: 0 8px 20px rgba(10, 42, 135, 0.3);
  margin-bottom: 24px;
}

.hero p {
  font-size: clamp(20px, 1.35vw, 20px);
  line-height: 1.8;
  opacity: 0.95;
  margin: 0 auto 36px;
  max-width: 980px;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  min-width: 196px;
  margin-top: 40px;
  height: 64px;
  padding: 0 34px;
  border-radius: 999px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
  border: 1px solid transparent;
  background:
    linear-gradient(90deg, #2f74f5 0%, #5f96ff 100%) padding-box,
    linear-gradient(90deg, rgba(212, 229, 255, 0.95) 0%, rgba(122, 172, 255, 0.95) 45%, rgba(210, 227, 255, 0.92) 100%) border-box;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45), 0 8px 20px rgba(40, 98, 228, 0.2);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
}

.hero-btn::before,
.hero-btn::after {
  content: "✦";
  color: rgba(255, 255, 255, 0.95);
  font-size: 14px;
  line-height: 1;
}

.hero-btn::before {
  margin-right: 10px;
}

.hero-btn::after {
  margin-left: 10px;
}

.hero-btn:hover {
  transform: translateY(-1px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), 0 10px 24px rgba(40, 98, 228, 0.28);
}

.floating {
  position: absolute;
  z-index: 2;
  filter: drop-shadow(0 14px 24px rgba(6, 41, 138, 0.25));
  transform-style: preserve-3d;
  will-change: transform;
  transition: opacity 0.35s ease;
}

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

.h1 { width: 266px; left: -1%; top: 170px; }
.h2 { width: 357px; left: 2%; top: 410px; }
.h3 { width: 280px; right: -2%; top: 162px; }
.h4 { width: 200px; right: 4%; top: 465px; }

section {
  position: relative;
  z-index: 2;
}

.snap-section {
  position: relative;
  width: 100%;
}

.section-ai {
  background:#fff;
  padding: 84px 0 96px;
}

.section-ai .container {
  position: relative;
  display: block;
  padding: 12px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 16px;
}

.section-title h2 {
  font-size: clamp(34px, 3vw, 48px);
  letter-spacing: 0;
  color: #0f1f45;
}

.section-title p {
  margin-top: 6px;
  color: #0f1f45;
  font-size: clamp(34px, 3vw, 42px);
  font-weight: 700;
  line-height: 1.15;
}

.section-subline {
  margin: 10px auto 0;
  max-width: 860px;
  font-size: 15px;
  line-height: 1.6;
  color: #6b7694;
}

.tab-bar {
  width: fit-content;
  margin: 0 auto 16px;
  background: #F0F5FA;
  border-radius: 14px;
  padding: 10px 14px;
  display: flex;
  position: sticky;
  top: calc(var(--header-height, 60px) + 8px);
  z-index: 30;
  justify-content: center;
  gap: 8px;
}

.tab-btn {
  border: 0;
  border-radius: 8px;
  padding: 0;
  width: 110px;
  min-width: 110px;
  height: 40px;
  background: transparent;
  color: #697890;
  font-size: 16px;
  cursor: pointer;
  transition: color 0.28s ease;
  white-space: nowrap;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  position: relative;
  z-index: 2;
  text-align: center;
  line-height: 1;
  text-decoration: none;
}

.tab-btn.active {
  color: #fff;
  transform: none;
  background: linear-gradient(135deg, #1f4dff, #2f67ff);
  box-shadow: 0 8px 16px rgba(34, 78, 226, 0.24);
}

.tab-bar.has-glider .tab-btn.active {
  background: transparent;
  box-shadow: none;
}

.tab-btn .iconfont {
  font-size: 20px;
  width: 14px;
  flex: 0 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1;
}

.tab-glider {
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: 152px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1f4dff, #2f67ff);
  box-shadow: 0 8px 16px rgba(34, 78, 226, 0.24);
  transition: transform 0.38s cubic-bezier(0.2, 0.8, 0.2, 1), width 0.24s ease;
  will-change: transform, width;
  z-index: 1;
}

.tab-btn.switch-burst::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  transform: translate(-50%, -50%);
  animation: tabBurst 0.5s ease-out;
}

.tab-btn.switch-burst .iconfont {
  animation: tabIconPop 0.42s cubic-bezier(0.2, 0.9, 0.2, 1);
}

@keyframes tabIconPop {
  0% { transform: scale(0.78) rotate(-8deg); opacity: 0.65; }
  58% { transform: scale(1.18) rotate(6deg); opacity: 1; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes tabBurst {
  from {
    opacity: 0.8;
    transform: translate(-50%, -50%) scale(0.55);
  }
  to {
    opacity: 0;
    transform: translate(-50%, -50%) scale(3.2);
  }
}

.feature-stack {
  position: relative;
  width: 100%;
  max-width: 1120px;
  min-height: 0;
  height: auto;
  margin: 0 auto;
  display: grid;
  gap: 100px;
}

.feature-item {
  min-height: 0;
  height: auto;
  border-radius: 22px;
  background: #fff;
  box-shadow: none;
  display: grid;
  grid-template-columns: 0.95fr 1.25fr;
  gap: 46px;
  padding: 12px 10px 18px;
  align-items: center;
  scroll-margin-top: 140px;
  transition: transform 0.25s ease;
  position: relative;
  inset: auto;
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.feature-stack .feature-item.active,
.feature-stack .feature-item.is-focused {
  transform: none;
}

.feature-text h3 {
  font-size: clamp(32px, 2.4vw, 36px);
  margin-bottom: 16px;
  color: #1f263a;
  font-weight: 200;
}

.feature-text h3 span {
  color: #1f5eff;
  font-weight: 700;
  margin-left: 2px;
}

.feature-text ul {
  list-style: none;
  margin-bottom: 20px;
  color: #596483;
  display: grid;
  gap: 16px;
  position: relative;
  padding-left: 0;
}

.feature-text ul::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 30px;
  bottom: 34px;
  width: 2px;
  background: linear-gradient(180deg, rgba(38, 97, 255, 0.7), rgba(38, 97, 255, 0.1));
}

.feature-text li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.feature-text li .iconfont {
  color: #2360ff;
  font-size: 25px;
  line-height: 1.3;
  margin-top: 2px;
  background: #fff;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.feature-text li span {
  font-size: 17px;
  line-height: 1.58;
}

.feature-text li strong {
  display: inline-block;
  color: #0f1f45;
  font-size: 21px;
  margin-bottom: 5px;
}

.feature-action {
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: 999px;
  padding: 14px 48px;
  color: #fff;
  background: linear-gradient(90deg, #1f5dff, #48beff);
  font-weight: 700;
  font-size: 22px;
  cursor: pointer;
  box-shadow: 0 14px 24px rgba(31, 93, 255, 0.26);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-action:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 30px rgba(31, 93, 255, 0.3);
}

.feature-visual {
  border-radius: 30px;
  border: none;
  overflow: hidden;
  min-height: 0;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-visual img {
  border-radius: 18px;
  border: none;
  outline: none;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.feature-visual video {
  border-radius: 18px;
  border: none;
  outline: none;
  display: block;
  overflow: hidden;
  clip-path: inset(0 round 18px);
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.platform {
  background: linear-gradient(180deg, #060f52 0%, #0a1f75 100%);
  padding: 90px 0;
  color: #fff;
  overflow: hidden;
}

.platform .title {
  text-align: center;
  max-width: 930px;
  margin: 0 auto 26px;
}

.platform .title h2 {
  font-size: clamp(32px, 3vw, 50px);
  margin-bottom: 12px;
}

.platform .title p {
  line-height: 1.8;
  font-size: 17px;
  color: rgba(255, 255, 255, 0.8);
}

.platform .scene {
  margin-top: 14px;
  border-radius: 26px;
  overflow: hidden;
}
.platform .scene span{
  font-size: 16px;
  display: block;
  color:rgba(255,255,255,.4);
  text-align: center;
}
.platform .scene img {
  width: 100%;
  height: auto;
}

.assist {
  padding: 84px 0 96px;
  background: url("img/bg.jpg") center center / cover no-repeat;
}

.assist-box {
  border-radius: 34px;
  padding: 26px 16px 10px;
  color: #fff;
  background: transparent;
  box-shadow: none;
}

.assist-head {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.assist-head img {
  width: auto;
  height: 56px;
  margin-top: 10px;
}

.assist-slogan {
  font-size: clamp(40px, 3.8vw, 42px);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(90deg, #2957ff 0%, #7d4dff 45%, #ff4f9a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.assist-desc {
  text-align: center;
  max-width: 1080px;
  margin: 0 auto 28px;
  font-size: 16px;
  line-height: 1.68;
  color: rgba(219, 234, 255, 0.92);
}

.assist-box h3 {
  text-align: center;
  font-size: clamp(30px, 3.9vw, 32px);
  font-weight: 700;
  margin-bottom: 30px;
}

.assist-input {
  background: #ffffff;
  border-radius: 20px;
  min-height: 206px;
  border: 3px solid #1a8ddd;
  position: relative;
  padding: 24px 28px;
  color: #bfc8d7;
  box-shadow: 0 10px 26px rgba(26, 94, 231, 0.14);
  transition: border-color 0.28s ease, box-shadow 0.28s ease, transform 0.28s ease;
}

.assist-placeholder {
  font-size: 19px;
  color: #c0c8d8;
  font-weight: 500;
}

.assist-textarea {
  width: 100%;
  min-height: 120px;
  border: 0;
  outline: none;
  resize: vertical;
  background: transparent;
  color: #44516b;
  font-size: 18px;
  line-height: 1.6;
  font-family: inherit;
  padding-right: 64px;
  transition: color 0.2s ease;
}

.assist-textarea::placeholder {
  color: #c0c8d8;
  transition: color 0.2s ease;
}

.assist-model-chip {
  position: absolute;
  left: 24px;
  bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 14px;
  color: #65748d;
  border: 1px solid #d4dbe9;
  background: #f7f9ff;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}

.assist-send {
  position: absolute;
  right: 18px;
  bottom: 16px;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  background: linear-gradient(145deg, #2450ef, #2f62ff);
  color: #fff;
  font-size: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.assist-input:focus-within {
  border-color: #1f61ff;
  box-shadow: 0 16px 36px rgba(26, 98, 230, 0.24), 0 0 0 4px rgba(55, 131, 255, 0.14);
  transform: translateY(-2px);
}

.assist-input:focus-within .assist-textarea {
  color: #2c3b59;
}

.assist-input:focus-within .assist-textarea::placeholder {
  color: #95a5bf;
}

.assist-input:focus-within .assist-model-chip {
  border-color: #aac7ff;
  color: #2f5fe3;
  background: #eef4ff;
}

.assist-input:focus-within .assist-send {
  transform: translateY(-1px) scale(1.03);
  background: linear-gradient(145deg, #1f4df2, #3b75ff);
  box-shadow: 0 8px 18px rgba(38, 93, 240, 0.34);
}

.assist-tags {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.assist-tags span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 2px solid;
  border-radius: 12px;
  padding: 10px 16px;
  min-height: 52px;
  font-size: 16px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.85);
}

.assist-tags .iconfont {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
}

.assist-tags .tag-violet {
  border-color: #6d63ff;
  color: #6354ee;
}

.assist-tags .tag-violet .iconfont {
  background: #6d63ff;
  color: #fff;
  font-weight: normal;
}

.assist-tags .tag-orange {
  border-color: #ff7a2f;
  color: #ff7a2f;
}

.assist-tags .tag-orange .iconfont {
  background: #ff7a2f;
  color: #fff;
}

.assist-tags .tag-cyan {
  border-color: #17b2ee;
  color: #1598d1;
}

.assist-tags .tag-cyan .iconfont {
  background: #17b2ee;
  color: #fff;
}

.assist-tags .tag-gold {
  border-color: #f4ad2e;
  color: #e89a19;
}

.assist-tags .tag-gold .iconfont {
  background: #f4ad2e;
  color: #fff;
}

.quick-icons {
  display: none;
}

.assist-note {
  margin-top: 34px;
  text-align: center;
  color: rgba(107, 122, 145, 0.62);
  line-height: 1.75;
  font-size: 13px;
}

.advantages {
  background: #edf2f9;
  padding: 108px 0 120px;
}

.advantages h2 {
  text-align: center;
  font-size: 40px;
  color: #0b1538;
  margin-bottom: 44px;
  letter-spacing: -0.4px;
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.adv-card {
  min-height: 390px;
  border-radius: 28px;
  overflow: hidden;
  color: #fff;
  position: relative;
  padding: 34px 34px 28px;
  box-shadow: 0 12px 38px rgba(11, 40, 124, 0.21);
  isolation: isolate;
  border: 1px solid rgba(255, 255, 255, 0.36);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.adv-grid .adv-card:nth-child(1) {
  grid-column: span 7;
  min-height: 402px;
}

.adv-grid .adv-card:nth-child(2) {
  grid-column: span 5;
  min-height: 402px;
}

.adv-grid .adv-card:nth-child(3) {
  grid-column: span 5;
  min-height: 374px;
}

.adv-grid .adv-card:nth-child(4) {
  grid-column: span 7;
  min-height: 374px;
}

.adv-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, #452CEE 0%, #7082FF 100%);
}

.adv-card.pink::before {
  background: linear-gradient(90deg, #F56C56 0%, #E8357C 100%);
}

.adv-card.deep::before {
  background: linear-gradient(90deg, #140940 0%, #281E73 100%);
}

.adv-card h3 {
  font-size: 32px;
  margin-bottom: 14px;
  line-height: 1.3;
  max-width: 420px;
  font-weight: 700;
}

.adv-sub {
  max-width: 460px;
  line-height: 1.55;
  opacity: 0.62;
  font-size: 16px;
}

.adv-bottom {
  max-width: 470px;
  line-height: 1.65;
  opacity: 0.98;
  font-size: 17px;
  margin-top: auto;
  padding-top: 14px;
}

.adv-card > :not(.adv-art) {
  position: relative;
  z-index: 3;
}

.adv-art {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  z-index: 1;
  pointer-events: none;
  transition: transform 0.4s ease, filter 0.4s ease;
}

.adv-grid .adv-card:nth-child(2) .adv-art {
  width: 80%;
  left: 50%;
  right: auto;
  transform: translateX(-50%);
}

.adv-grid .adv-card:nth-child(3) .adv-art {
  height: 90%;
  width: auto;
  left: 50%;
  right: auto;
  transform: translateX(-50%);
}

.adv-card:hover .adv-art {
  transform: scale(1.08);
  filter: saturate(1.08);
}

.adv-grid .adv-card:nth-child(2):hover .adv-art {
  transform: translateX(-50%) scale(1.08);
}

.adv-grid .adv-card:nth-child(3):hover .adv-art {
  transform: translateX(-50%) scale(1.08);
}
.adv-card:last-child:before{
  background: linear-gradient(90deg, #0064FF 0%, #2CBCFF 58.05%);
}
.cta {
  background: #0f1d88;
  padding: 10px 0 0;
  position: relative;
  overflow: hidden;
  color: #fff;
  border-radius: 28px 28px 0 0;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("img/footerbg.jpg") center / cover no-repeat;
  opacity: 1;
  z-index: 0;
}

.cta-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 68px 24px 64px;
  border-radius: 22px 22px 0 0;
  /*background: radial-gradient(circle at 50% 38%, rgba(93, 145, 255, 0.34), rgba(8, 34, 144, 0.16) 60%, rgba(8, 34, 144, 0) 82%);*/
  border: 0;
}

.cta-inner::before,
.cta-inner::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  border: 1px solid rgba(126, 166, 255, 0.22);
  border-radius: 50%;
  pointer-events: none;
}

.cta-inner::before {
  width: 560px;
  height: 560px;
  bottom: -392px;
}

.cta-inner::after {
  width: 760px;
  height: 760px;
  bottom: -548px;
  border-color: rgba(126, 166, 255, 0.16);
}

.cta-inner h2 {
  font-size: clamp(56px, 4.4vw, 68px);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
  font-size: 40px;
}

.cta-inner p {
  font-size: 16px;
  opacity: 0.88;
  margin-bottom: 28px;
}

.cta button {
  border: 1px solid rgba(214, 228, 255, 0.42);
  border-radius: 999px;
  padding: 14px 38px;
  color: #fff;
  font-size: 16px;
  margin-top: 40px;
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(180deg, rgba(125, 160, 255, 0.24), rgba(79, 109, 204, 0.2));
  backdrop-filter: blur(4px);
}

.footer-float {
  position: absolute;
  width: 186px;
  opacity: 0.94;
  z-index: 1;
  --rot: 0deg;
  animation: floatBob 5.4s ease-in-out infinite;
}

.f1 { left: 0; top: 52px; animation-delay: 0s; --rot: -12deg; }
.f2 { left: 0; top: 174px; animation-delay: 0.8s; --rot: 8deg; width: 212px; }
.f3 { right: 5.4%; top: 88px; animation-delay: 0.4s; --rot: -10deg; width: 228px; }
.f4 { right: -1.8%; top: 70px; animation-delay: 1.2s; --rot: 8deg; }
.f5 { right: -1.6%; top: 204px; animation-delay: 0.95s; --rot: -6deg; width: 176px; }

@keyframes floatBob {
  0%, 100% { transform: translate3d(0, 0, 0) rotate(var(--rot)); }
  50% { transform: translate3d(0, -10px, 0) rotate(var(--rot)); }
}

.site-footer {
  position: relative;
  z-index: 2;
  margin-top: -18px;
  padding-top: 14px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
}

.site-footer .logo {
  font-size: 62px;
  font-weight: 600;
  letter-spacing: 2px;
}

.site-footer .logo img {
  width: 82px;
  height: auto;
  display: block;
}

.footer-top {
  display: grid;
  grid-template-columns: 120px 1fr;
  align-items: end;
  gap: 40px;
  background: transparent;
  position: relative;
  z-index: 3;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  background: transparent;
}

.footer-col h4 {
  font-size: 14px;
  margin-bottom: 6px;
  color: rgba(221, 236, 255, 0.96);
}

.footer-col p {
  font-size: 14px;
  line-height: 1.55;
  color: rgba(200, 220, 255, 0.84);
  background: transparent;
}

.footer-col p a {
  color: inherit;
  text-decoration: none;
  transition: color 0.22s ease;
}

.footer-col p a:hover {
  color: #9fd4ff;
}

.cta .footer-col h4 a:hover {
  color: #ffffff;
}

.footer-bottom {
  margin-top: 12px;
  padding: 12px 72px 10px;
  border-top: 1px solid rgba(166, 192, 255, 0.18);
  gap: 16px;
  font-size: 12px;
  color: rgba(186, 204, 246, 0.86);
  background: rgba(4, 22, 116, 0.92);
  position: relative;
  left: 50%;
  right: 50%;
  width: 100vw;
  margin-left: -50vw;
  margin-right: -50vw;
}
.footer-bottom .container{
  display: flex;
  justify-content: space-between;
}

@media (max-width: 1080px) {


  .hero {
    min-height: 690px;
  }

  .hero-content {
    margin-top: 74px;
  }

  .h1,
  .h2,
  .h3,
  .h4 {
    width: 140px;
  }

  .section-ai {
    height: auto;
    min-height: 100vh;
    overflow: visible;
    position: static;
    top: auto;
    padding: 72px 0 84px;
  }

  .section-ai .container {
    position: static;
    top: auto;
    height: auto;
    display: block;
  }

  .feature-stack {
    min-height: 640px;
    height: auto;
  }

  .feature-item {
    grid-template-columns: 1fr;
    min-height: 620px;
    padding: 16px 8px;
  }

  .feature-text h3 {
    font-size: 30px;
  }

  .section-subline {
    font-size: 15px;
    max-width: 720px;
  }

  .adv-card h3 {
    font-size: 26px;
  }

  .adv-sub {
    font-size: 14px;
  }

  .adv-bottom {
    font-size: 15px;
  }

  .adv-card {
    min-height: 340px;
  }

  .cta-inner h2 {
    font-size: 40px;
  }

  .footer-float {
    width: 150px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .site-footer .logo {
    font-size: 44px;
  }

  .site-footer .logo img {
    width: 90px;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .footer-bottom {
    display: grid;
    gap: 6px;
    padding: 10px 14px 8px;
    width: 100vw;
  }

  .adv-art {
    width: 46%;
  }

  .footer-float {
    width: 120px;
  }
}

@media (max-width: 768px) {
  html,
  body {
    scroll-snap-type: none;
  }

  .container {
    width: min(1200px, calc(100% - 26px));
  }

  .site-header {
    padding: 0;
  }

  .site-header .container {
    padding: 0 14px!important;
    height: 60px;
    justify-content: flex-start;
    gap: 8px;
  }

  .site-header .brand {
    margin-right: auto;
  }

  .site-header.mobile-open {
    z-index: 1201;
  }

  .brand img {
    width: 64px;
  }

  .site-header .login-btn {
    display: inline-flex !important;
    padding: 9px 16px;
    font-size: 13px;
    order: 2;
  }

  .site-header .mobile-menu-btn {
    order: 3;
  }

  .hero {
    height: auto;
    min-height: 560px;
  }

  .hero-content {
    margin-top: 152px;
  }

  .hero h1 {
    font-size: 30px;
  }

  .hero p {
    font-size: 14px;
    line-height: 1.65;
  }

  .h1,
  .h2,
  .h3,
  .h4 {
    display: none;
  }

  .section-ai,
  .platform,
  .assist,
  .advantages {
    padding-top: 52px;
  }

  .section-ai {
    height: auto;
    min-height: 0;
    overflow: visible;
    position: static;
    top: auto;
    padding: 52px 0 64px;
  }

  .section-ai .container {
    position: static;
    top: auto;
    height: auto;
    display: block;
  }

  .section-title p {
    font-size: 20px;
    line-height: 1.35;
  }

  .section-subline {
    font-size: 13px;
    line-height: 1.6;
    margin-top: 8px;
  }

  .tab-bar {
    position: static;
    top: auto;
    width: 100%;
    overflow-x: auto;
    justify-content: flex-start;
    padding: 6px 4px;
  }

  .tab-btn {
    flex: 0 0 auto;
    font-size: 16px;
    width: auto;
    min-width: auto;
    height: 44px;
    padding: 0 16px;
    border-radius: 12px;
    gap: 6px;
  }

  .tab-btn .iconfont {
    font-size: 16px;
    width: 16px;
  }

  .tab-glider {
    display: none;
  }

  .tab-bar.has-glider .tab-btn.active {
    background: linear-gradient(135deg, #1f4dff, #2f67ff);
    box-shadow: 0 8px 16px rgba(34, 78, 226, 0.24);
  }

  .feature-stack {
    min-height: auto;
  }

  .feature-item {
    position: static;
    inset: auto;
    display: grid;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    padding: 16px;
    border-radius: 18px;
    min-height: auto;
  }

  .feature-stack .feature-item.active,
  .feature-stack .feature-item.is-focused {
    display: grid;
  }

  .feature-text h3 {
    font-size: 22px;
  }

  .feature-text li strong {
    font-size: 15px;
  }

  .feature-visual {
    min-height: 170px;
  }

  .assist-box {
    padding: 10px 4px 0;
  }

  .assist-head img {
    width: 180px;
  }

  .assist-slogan {
    font-size: 22px;
  }

  .assist-desc {
    font-size: 13px;
    line-height: 1.55;
    margin-bottom: 14px;
  }

  .assist-box h3 {
    font-size: 24px;
    margin-bottom: 16px;
  }

  .assist-input {
    min-height: 156px;
    border-width: 2px;
    border-radius: 16px;
    padding: 16px;
  }

  .assist-placeholder {
    font-size: 15px;
  }

  .assist-textarea {
    min-height: 88px;
    font-size: 15px;
    padding-right: 52px;
  }

  .assist-model-chip {
    left: 14px;
    bottom: 12px;
    padding: 6px 10px;
    font-size: 12px;
  }

  .assist-send {
    right: 12px;
    bottom: 10px;
    width: 40px;
    height: 40px;
    font-size: 18px;
  }

  .assist-tags {
    margin-top: 14px;
    gap: 10px;
  }

  .assist-tags span {
    width: calc(50% - 5px);
    justify-content: flex-start;
    font-size: 13px;
    padding: 8px 10px;
    border-radius: 10px;
  }

  .assist-tags .iconfont {
    width: 22px;
    height: 22px;
    font-size: 14px;
    border-radius: 6px;
    font-weight: normal;
  }

  .assist-note {
    margin-top: 16px;
    font-size: 11px;
    line-height: 1.6;
  }

  .advantages h2 {
    font-size: 26px;
  }

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

  .adv-card {
    min-height: 244px;
  }

  .adv-grid .adv-card:nth-child(1),
  .adv-grid .adv-card:nth-child(2),
  .adv-grid .adv-card:nth-child(3),
  .adv-grid .adv-card:nth-child(4) {
    grid-column: auto;
    min-height: 244px;
  }

  .adv-card h3 {
    font-size: 20px;
  }

  .adv-sub {
    font-size: 13px;
  }

  .adv-bottom {
    font-size: 14px;
    line-height: 1.6;
  }

  .adv-art {
    width: 48%;
  }

  .footer-float {
    display: none;
  }

  .site-footer {
    margin-top: 8px;
    text-align: center;
  }

  .site-footer .logo {
    font-size: 36px;
  }

  .site-footer .logo img {
    width: 76px;
  }

  .footer-col h4 {
    font-size: 18px;
    margin-bottom: 6px;
  }

  .footer-col p {
    font-size: 13px;
    line-height: 1.55;
  }

  .footer-bottom {
    font-size: 12px;
    padding: 10px 12px 8px;
  }
}