:root {
  --accent: #3b6ff0;
  --accent-light: #6b97ff;
  --text: #0f172a;
  --text-mid: #475569;
  --text-dim: #94a3b8;
  --border: rgba(15, 23, 42, 0.08);
  --card-bg: rgba(255, 255, 255, 0.72);
  --bg: #ffffff;
}

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

html {
  scroll-behavior: smooth;
  min-height: 100%;
}

body {
  font-family: -apple-system, 'PingFang SC', 'Helvetica Neue', sans-serif;
  background:
    radial-gradient(ellipse 70% 50% at 15% 10%,  #BDE4FC 0%, transparent 70%),
    radial-gradient(ellipse 55% 40% at 90% 25%,  #cdeefa 0%, transparent 65%),
    radial-gradient(ellipse 60% 45% at 60% 65%,  #BDE4FC 0%, transparent 60%),
    radial-gradient(ellipse 40% 35% at 5%  80%,  #d8f1fd 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 90%,  #c5e9fb 0%, transparent 65%),
    #f6fbff;
  color: var(--text);
  overflow-x: hidden;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

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

.nav-avatar {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.nav-logo-img {
  height: 22px;
  width: auto;
  object-fit: contain;
}

.nav-cta {
  background: var(--text);
  border: none;
  color: white;
  padding: 10px 22px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.3px;
  transition: opacity 0.2s, transform 0.2s;
}
.nav-cta:hover { opacity: 0.75; transform: translateY(-1px); }

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
  position: relative;
}

.hero-inner { max-width: 720px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(59, 111, 240, 0.07);
  border: 1px solid rgba(59, 111, 240, 0.18);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 11px;
  letter-spacing: 1.8px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 36px;
}
.hero-badge-dot {
  width: 5px; height: 5px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2.2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.6); }
}

.hero-title {
  font-size: clamp(40px, 6vw, 70px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -2px;
  color: var(--text);
  margin-bottom: 24px;
}
.hero-title .highlight {
  background: linear-gradient(120deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(15px, 2vw, 17px);
  color: var(--text-mid);
  line-height: 1.9;
  margin-bottom: 48px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--text);
  color: white;
  font-size: 15px;
  font-weight: 700;
  padding: 16px 38px;
  border-radius: 100px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.25s;
  letter-spacing: 0.3px;
}
.hero-btn:hover { opacity: 0.8; transform: translateY(-2px); }
.hero-btn svg { width: 18px; height: 18px; }

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px; height: 36px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  animation: scroll-drop 2s ease-in-out infinite;
}
@keyframes scroll-drop {
  0%,100% { opacity: 0.4; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(0.6); }
}

/* ── FEATURES ── */
#features { padding: 140px 0; }

.section-label {
  text-align: center;
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  text-align: center;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 72px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 28px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
  cursor: default;
  transition: transform 0.3s cubic-bezier(.22,.68,0,1.2), box-shadow 0.3s, border-color 0.3s;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(15, 23, 42, 0.08);
  border-color: rgba(59, 111, 240, 0.2);
}

.feature-num {
  font-size: 10px;
  letter-spacing: 2.5px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 20px;
  opacity: 0.8;
}

.feature-icon {
  width: 44px; height: 44px;
  background: rgba(59, 111, 240, 0.07);
  border: 1px solid rgba(59, 111, 240, 0.14);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.feature-icon svg { width: 22px; height: 22px; stroke: var(--accent); }

.feature-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 13.5px;
  color: var(--text-mid);
  line-height: 1.85;
}

.feature-line {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}
.feature-card:hover .feature-line { transform: scaleX(1); }

/* ── DOWNLOAD ── */
#download { padding: 100px 0; }

.download-inner {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 72px 60px;
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}
.download-inner::before {
  content: '';
  position: absolute;
  top: -120px; right: -120px;
  width: 340px; height: 340px;
  background: radial-gradient(circle, rgba(59,111,240,0.06), transparent 70%);
  pointer-events: none;
}
.download-inner::after {
  content: '';
  position: absolute;
  bottom: -80px; left: -80px;
  width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(107,151,255,0.06), transparent 70%);
  pointer-events: none;
}

.download-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 10px;
}

.download-sub {
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 48px;
  letter-spacing: 0.3px;
}

.download-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 28px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
  min-width: 210px;
  box-shadow: 0 2px 8px rgba(15,23,42,0.04);
}
.dl-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(15,23,42,0.1);
  border-color: rgba(59,111,240,0.25);
}
.dl-btn svg { width: 28px; height: 28px; flex-shrink: 0; fill: var(--text); }
.dl-btn-text { text-align: left; }
.dl-btn-label { font-size: 10px; color: var(--text-dim); letter-spacing: 0.5px; margin-bottom: 2px; }
.dl-btn-name { font-size: 16px; font-weight: 700; color: var(--text); }

/* ── FOOTER ── */
footer {
  padding: 80px 0 52px;
  text-align: center;
  position: relative;
}

.footer-slogan {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 600;
  color: var(--text-mid);
  line-height: 1.8;
  max-width: 560px;
  margin: 0 auto 40px;
  letter-spacing: 0.2px;
}
.footer-slogan em {
  font-style: normal;
  color: var(--accent);
}

.footer-divider {
  width: 36px; height: 1px;
  background: var(--border);
  margin: 0 auto 24px;
}

.footer-copy {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* ── REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .features-grid { grid-template-columns: 1fr; }
  .download-inner { padding: 48px 24px; }
  nav { padding: 14px 20px; }
  .container { padding: 0 20px; }
}
@media (max-width: 480px) {
  .download-btns { flex-direction: column; align-items: center; }
  .dl-btn { width: 100%; max-width: 280px; }
}