:root {
  --bg: #06070d;
  --text: #eaf0f8;
  --muted: #9aa5bf;
  --dim: #565d70;
  --cyan: #43e0c9;
  --violet: #7a86ff;
  --amber: #ffb45c;
  --glass: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.1);
  --radius: 20px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

::selection { background: rgba(122,134,255,.4); color: #fff; }

/* ---------- 背景层 ---------- */
#bg { position: fixed; inset: 0; z-index: 0; display: block; }

.glow {
  position: fixed; z-index: 1; border-radius: 50%;
  pointer-events: none; filter: blur(90px); opacity: .5;
}
.glow-1 {
  width: 55vw; height: 55vw; top: -18vw; left: -12vw;
  background: radial-gradient(circle, rgba(122,134,255,.5), transparent 70%);
  animation: float1 16s ease-in-out infinite;
}
.glow-2 {
  width: 45vw; height: 45vw; bottom: -15vw; right: -10vw;
  background: radial-gradient(circle, rgba(67,224,201,.35), transparent 70%);
  animation: float2 20s ease-in-out infinite;
}
.glow-3 {
  width: 40vw; height: 40vw; top: 40%; left: 55%;
  background: radial-gradient(circle, rgba(255,180,92,.20), transparent 70%);
  animation: float3 24s ease-in-out infinite;
}
@keyframes float1 { 50% { transform: translate(6vw, 4vw) scale(1.1); } }
@keyframes float2 { 50% { transform: translate(-5vw, -3vw) scale(1.15); } }
@keyframes float3 { 50% { transform: translate(-4vw, 5vw) scale(1.05); } }

.vignette {
  position: fixed; inset: 0; z-index: 2; pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(5,5,10,.85) 100%);
}

/* ---------- 内容层 ---------- */
.wrap { position: relative; z-index: 10; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 5vw;
  transition: background .4s, backdrop-filter .4s, border-color .4s, padding .4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(6,7,13,.6);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  padding: 12px 5vw;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 20px; letter-spacing: .04em;
  color: var(--text); text-decoration: none;
}
.logo .dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  box-shadow: 0 0 18px var(--violet);
}
.logo .grad {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav-links { display: flex; gap: 34px; align-items: center; }
.nav-links a {
  color: var(--muted); text-decoration: none; font-size: 15px;
  transition: color .3s;
}
.nav-links a:hover { color: #fff; }
.nav-links a.active { color: #fff; }
.nav .btn { font-size: 14px; padding: 9px 20px; }

/* ---------- 通用 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 15px 30px; border-radius: 999px;
  font-weight: 600; font-size: 16px; letter-spacing: .02em;
  cursor: pointer; text-decoration: none;
  transition: transform .3s cubic-bezier(.22,1,.36,1), box-shadow .3s, background .3s;
  border: none; font-family: inherit;
}
.btn-primary {
  color: #04040a;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  background-size: 200% 100%;
  box-shadow: 0 10px 40px -8px rgba(67,224,201,.55);
}
.btn-primary:hover {
  transform: translateY(-3px);
  background-position: 100% 0;
  box-shadow: 0 18px 55px -8px rgba(67,224,201,.7);
}
.btn-ghost {
  color: var(--text);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
}
.btn-ghost:hover {
  transform: translateY(-3px);
  border-color: rgba(255,255,255,.25);
  background: rgba(255,255,255,.09);
}

.text-gradient {
  background: linear-gradient(90deg, var(--cyan), var(--violet), var(--amber), var(--cyan));
  background-size: 300% 100%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: gradShift 7s linear infinite;
}
@keyframes gradShift { to { background-position: 300% 0; } }

.section { padding: 120px 5vw; position: relative; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: .3em; text-transform: uppercase;
  color: var(--cyan); margin-bottom: 18px;
}
.eyebrow::before { content: ''; width: 30px; height: 1px; background: var(--cyan); }

h2.section-title {
  font-size: clamp(30px, 4.5vw, 52px);
  font-weight: 700; letter-spacing: -.01em; line-height: 1.15;
}
.section-sub { color: var(--muted); font-size: 17px; max-width: 620px; margin-top: 16px; }

/* 半透明玻璃底框（用于压在背景上的文字） */
.glass-panel {
  background: rgba(8, 10, 18, 0.72);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(16px);
  border-radius: var(--radius);
  padding: 32px 36px;
}

/* 滚动揭示初始态（由 JS 移除） */
[data-reveal] { opacity: 0; }

/* ---------- Hero（首页） ---------- */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 0 5vw;
}
.hero .badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 18px; border-radius: 999px;
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(16px); font-size: 13px; color: var(--text); letter-spacing: .08em;
}
.hero .badge .pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 0 0 rgba(67,224,201,.7);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(67,224,201,.7); }
  70% { box-shadow: 0 0 0 10px rgba(67,224,201,0); }
  100% { box-shadow: 0 0 0 0 rgba(67,224,201,0); }
}
.hero h1 {
  margin-top: 30px; font-size: clamp(44px, 9vw, 108px);
  font-weight: 900; letter-spacing: -.02em; line-height: 1.04;
}
.hero h1 .line { display: block; }
.hero .sub {
  margin-top: 28px; max-width: 640px;
  font-size: clamp(16px, 2vw, 19px); color: #d7dfef; font-weight: 400;
}
.hero .btns { margin-top: 40px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }

.scroll-hint {
  position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  color: var(--dim); font-size: 12px; letter-spacing: .3em;
}
.scroll-hint .mouse {
  width: 24px; height: 38px; border: 1.5px solid rgba(255,255,255,.3);
  border-radius: 14px; position: relative;
}
.scroll-hint .mouse::after {
  content: ''; position: absolute; top: 7px; left: 50%;
  width: 4px; height: 8px; margin-left: -2px; border-radius: 2px;
  background: var(--cyan); animation: wheel 1.6s ease-in-out infinite;
}
@keyframes wheel { 0%{opacity:0; transform: translateY(0);} 30%{opacity:1;} 100%{opacity:0; transform: translateY(12px);} }

/* ---------- 子页面 Hero ---------- */
.page-hero {
  min-height: 62vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 160px 5vw 80px;
}
.page-hero h1 {
  font-size: clamp(38px, 6.5vw, 72px);
  font-weight: 900; letter-spacing: -.02em; line-height: 1.08;
}
.page-hero .sub {
  margin-top: 22px; max-width: 640px;
  font-size: clamp(16px, 2vw, 19px); color: var(--muted); font-weight: 300;
}

/* ---------- 跑马灯 ---------- */
.marquee {
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  padding: 22px 0; overflow: hidden; position: relative;
}
.marquee-track { display: flex; gap: 60px; white-space: nowrap; width: max-content; animation: marquee 30s linear infinite; }
.marquee-track span { font-size: 15px; letter-spacing: .25em; color: var(--dim); text-transform: uppercase; }
.marquee-track .sep { color: var(--violet); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 数据统计 ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 20px; }
.stat {
  padding: 38px 28px; border-radius: var(--radius);
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(16px); text-align: center;
}
.stat .num {
  font-size: clamp(32px, 4vw, 48px); font-weight: 700; letter-spacing: -.02em;
  background: linear-gradient(90deg, #fff, #b9c4ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat .label { margin-top: 8px; color: var(--muted); font-size: 14px; letter-spacing: .06em; }

/* ---------- 卡片 ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 56px; }
.card {
  position: relative; padding: 38px 32px; border-radius: var(--radius);
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(16px); overflow: hidden;
  transition: translate .45s cubic-bezier(.22,1,.36,1), border-color .45s, box-shadow .45s;
}
.card::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: radial-gradient(280px circle at var(--mx, 50%) var(--my, 50%), rgba(67,224,201,.16), transparent 60%);
  opacity: 0; transition: opacity .45s; pointer-events: none;
}
.card:hover {
  translate: 0 -8px;
  border-color: rgba(255,255,255,.22);
  box-shadow: 0 30px 60px -30px rgba(0,0,0,.8), 0 0 40px -20px rgba(67,224,201,.5);
}
.card:hover::before { opacity: 1; }
.card .icon {
  width: 52px; height: 52px; display: flex; align-items: center; justify-content: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(67,224,201,.15), rgba(122,134,255,.15));
  border: 1px solid var(--glass-border); color: var(--cyan); margin-bottom: 22px;
}
.card .icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.card p { color: var(--muted); font-size: 15px; font-weight: 300; }

.scenarios-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 56px; }
.scenarios-grid .card { padding: 32px 26px; }
.scenarios-grid .card .icon { margin-bottom: 18px; }

/* ---------- 场景详情页 ---------- */
.scene-block {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center;
  padding: 80px 0; max-width: 1080px; margin: 0 auto;
}
.scene-block + .scene-block { border-top: 1px solid var(--glass-border); }
.scene-block .tag {
  display: inline-block; font-size: 12px; letter-spacing: .2em; color: var(--cyan);
  margin-bottom: 14px;
}
.scene-block h3 { font-size: clamp(26px, 3.5vw, 40px); font-weight: 700; letter-spacing: -.01em; margin-bottom: 16px; }
.scene-block > div > p { color: var(--muted); font-size: 16px; margin-bottom: 22px; }
.scene-block ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.scene-block ul li { display: flex; gap: 12px; align-items: flex-start; color: var(--muted); font-size: 15px; }
.scene-block ul li b { color: var(--cyan); font-weight: 600; }
.scene-visual { display: flex; flex-direction: column; gap: 18px; }
.scene-visual .scene-img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block;
  border-radius: var(--radius); border: 1px solid var(--glass-border);
  box-shadow: 0 30px 80px -40px rgba(0,0,0,.9), 0 0 50px -20px rgba(67,224,201,.35);
}
.scene-visual .chips { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-start; }
.scene-visual .chip {
  padding: 8px 16px; border-radius: 999px; font-size: 13px; color: var(--muted);
  background: var(--glass); border: 1px solid var(--glass-border);
  cursor: pointer; font-family: inherit;
  transition: color .25s, border-color .25s, background .25s;
}
.scene-visual .chip:hover { color: #fff; border-color: rgba(255,255,255,.3); }
.scene-visual .chip.active {
  color: #04040a; background: linear-gradient(90deg, var(--cyan), var(--violet));
  border-color: transparent; font-weight: 600;
}
.scene-visual .chip-desc {
  font-size: 14px; color: var(--muted); line-height: 1.7;
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px; padding: 14px 16px; backdrop-filter: blur(14px);
}

/* ---------- Showcase / 终端 ---------- */
.showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.showcase .features-list { list-style: none; margin-top: 32px; display: flex; flex-direction: column; gap: 20px; }
.showcase .features-list li { display: flex; gap: 14px; align-items: flex-start; color: var(--muted); font-size: 16px; }
.showcase .features-list .check {
  flex: none; width: 24px; height: 24px; margin-top: 2px; border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  color: #04040a; font-size: 14px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

.terminal {
  border-radius: var(--radius);
  background: rgba(10,10,18,.75); border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  box-shadow: 0 40px 90px -40px rgba(0,0,0,.9), 0 0 60px -30px rgba(67,224,201,.35);
  overflow: hidden;
}
.terminal .bar {
  display: flex; align-items: center; gap: 8px; padding: 14px 18px;
  border-bottom: 1px solid var(--glass-border); background: rgba(255,255,255,.03);
}
.terminal .bar i { width: 12px; height: 12px; border-radius: 50%; }
.terminal .bar i:nth-child(1){ background:#ff5f57; }
.terminal .bar i:nth-child(2){ background:#febc2e; }
.terminal .bar i:nth-child(3){ background:#28c840; }
.terminal .bar .tt { margin-left: 12px; font-size: 12px; color: var(--dim); letter-spacing: .1em; }
.terminal .body {
  padding: 26px 24px;
  font-family: Consolas, "SFMono-Regular", "Courier New", monospace;
  font-size: 14px; line-height: 1.9;
}
.terminal .ln { white-space: pre-wrap; }
.terminal .c-dir { color: #7a86ff; }
.terminal .c-cmd { color: #eaf0f8; }
.terminal .c-key { color: #43e0c9; }
.terminal .c-str { color: #9fe8d8; }
.terminal .c-com { color: #565d70; }
.terminal .cursor {
  display: inline-block; width: 8px; height: 16px;
  background: var(--cyan); vertical-align: -2px; margin-left: 3px;
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- 演示页 ---------- */
.demo-form { display: flex; gap: 12px; margin: 40px auto 0; max-width: 620px; }
.demo-form input {
  flex: 1; padding: 16px 22px; border-radius: 999px;
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.12);
  color: var(--text); font-size: 16px; outline: none; font-family: inherit;
  transition: border-color .3s;
}
.demo-form input::placeholder { color: var(--muted); }
.demo-form input:focus { border-color: rgba(67,224,201,.6); }
.demo-presets { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 18px; }
.demo-presets button {
  padding: 8px 16px; border-radius: 999px; font-size: 13px; color: var(--text);
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.12); cursor: pointer;
  font-family: inherit; transition: color .3s, border-color .3s, background .3s;
}
.demo-presets button:hover { color: #fff; border-color: rgba(255,255,255,.35); background: rgba(255,255,255,.08); }
.demo-output { max-width: 760px; margin: 48px auto 0; text-align: left; }
.demo-output .terminal { display: none; }
.demo-output .terminal.show { display: block; }
.demo-summary { margin-top: 24px; }
.summary-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.summary-item {
  padding: 22px 16px; border-radius: 16px;
  background: var(--glass); border: 1px solid var(--glass-border); text-align: center;
}
.summary-item .v { font-size: 22px; font-weight: 700; color: var(--cyan); }
.summary-item .k { font-size: 12px; color: var(--dim); margin-top: 4px; letter-spacing: .04em; }

/* ---------- 开始页步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 56px; }
.step {
  padding: 32px 26px; border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--glass-border); text-align: center;
}
.step .n {
  width: 44px; height: 44px; margin: 0 auto 16px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 18px; color: #04040a;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
}
.step h3 { font-size: 18px; margin-bottom: 10px; }
.step p { color: var(--muted); font-size: 14px; }

/* ---------- CTA / 表单 ---------- */
.cta { text-align: center; position: relative; padding: 160px 5vw; }
.cta .ring {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 70vw; height: 70vw; border-radius: 50%;
  background: radial-gradient(circle, rgba(122,134,255,.18), transparent 60%);
  filter: blur(40px); pointer-events: none;
}
.cta h2 { font-size: clamp(34px, 6vw, 64px); font-weight: 800; letter-spacing: -.01em; line-height: 1.1; }
.cta p { color: var(--muted); margin: 22px auto 40px; max-width: 560px; font-size: 17px; }
.cta .btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.signup { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin: 0 auto; max-width: 560px; }
.signup input {
  flex: 1 1 260px; padding: 15px 22px; border-radius: 999px;
  background: rgba(8, 10, 18, 0.72); border: 1px solid rgba(255,255,255,0.12);
  color: var(--text); font-size: 16px; outline: none; font-family: inherit;
  transition: border-color .3s;
}
.signup input::placeholder { color: var(--muted); }
.signup input:focus { border-color: rgba(67,224,201,.6); }
.signup-msg { margin-top: 18px; font-size: 15px; color: var(--cyan); min-height: 24px; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--glass-border);
  padding: 50px 5vw;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 20px;
  color: var(--dim); font-size: 13px; letter-spacing: .04em;
}
footer .socials { display: flex; gap: 18px; }
footer .socials a { color: var(--dim); text-decoration: none; transition: color .3s; }
footer .socials a:hover { color: #fff; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase { grid-template-columns: 1fr; gap: 40px; }
  .scene-block { grid-template-columns: 1fr; gap: 32px; }
  .scene-block:nth-child(even) .scene-visual { order: 0; }
  .steps { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .stat { padding: 26px 16px; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
}