/* Base */
:root {
  --bg: #0f0f0f;
  --bg-muted: #141414;
  --text: #f5f5f5;
  --text-dim: #cfcfcf;
  --tiktok-pink: #fe2c55; /* TikTok pink */
  --tiktok-cyan: #25f4ee; /* TikTok cyan */
  --card: #1a1a1a;
  --border: #2a2a2a;
  --max-w: 1120px;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji';
  color: var(--text);
  background: linear-gradient(180deg, #0b0b0b 0%, #0f0f0f 30%, #0b0b0b 100%);
}

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

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10,10,10,0.6);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.3px;
  font-size: 20px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand::before {
  content: '';
  width: 10px; height: 10px; border-radius: 2px;
  background: linear-gradient(135deg, var(--tiktok-pink), var(--tiktok-cyan));
  box-shadow: 0 0 16px rgba(254,44,85,0.8), 0 0 24px rgba(37,244,238,0.7) inset;
}

.nav a { text-decoration: none; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  color: var(--text);
  border: 1px solid var(--border);
  background: #161616;
  border-radius: 12px;
  transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-cta {
  border: none;
  background: linear-gradient(135deg, var(--tiktok-pink), var(--tiktok-cyan));
  color: #0b0b0b;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(254,44,85,0.35), 0 8px 24px rgba(37,244,238,0.25);
}
.btn-lg {
  padding: 14px 22px;
  font-size: 16px;
  border-radius: 14px;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: url('./images/cover.jpg') center/cover no-repeat;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: rgba(0, 0, 0, 0.3); /* 30% dark overlay */
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 820px;
  width: 100%;
}
.hero h1 {
  font-size: clamp(28px, 4.5vw, 48px);
  line-height: 1.05;
  margin: 0 0 16px;
}
.hero p {
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1.6;
  margin: 0 auto 28px;
}

/* Sections */
.section { padding: 84px 0; }
.section-muted { background: var(--bg-muted); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: clamp(24px, 3vw, 32px); margin: 0 0 24px; }
.section p { color: var(--text-dim); }

/* Two column */
.two-col {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
}
.two-col .content { padding: 10px 0; }

.device-frame {
  width: min(420px, 90%);
  margin: 0 auto;
  border-radius: 32px;
  background: #0c0c0c;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 16px;
}
.device-img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  background: #222;
}

.steps {
  margin: 0; padding-left: 20px;
  display: grid; gap: 18px;
}
.steps h3 { margin: 0 0 6px; font-size: 18px; }
.steps p { margin: 0; }

/* Cards */
.cards { display: grid; gap: 18px; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.cards.four { grid-template-columns: repeat(4, 1fr); }

.card, .feature, .testimonial {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 6px 14px rgba(0,0,0,0.25);
}

.card-img {
  width: 100%;
  height: 200px;
  border-radius: 18px;
  object-fit: cover;
  margin-bottom: 12px;
}

.img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(37,244,238,0.18), rgba(254,44,85,0.18));
  border: 1px dashed rgba(255,255,255,0.2);
  margin-bottom: 12px;
}

/* Features */
.feature .icon {
  font-size: 26px;
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(37,244,238,0.15), rgba(254,44,85,0.15));
  margin-bottom: 10px;
}
.feature h3 { margin: 8px 0 8px; font-size: 18px; }
.feature p { margin: 0; }

/* Testimonials */
.testimonials-grid { grid-template-columns: repeat(4, 1fr); }
.testimonial { display: grid; gap: 10px; align-content: start; }
.avatar {
  width: 56px; height: 56px; border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}
.quote { color: var(--text); }
.name { color: var(--text-dim); font-weight: 600; font-size: 13px; letter-spacing: .4px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: #0c0c0c; }
.footer-inner { padding: 28px 0; text-align: center; color: var(--text-dim); }

/* Responsive */
@media (max-width: 1024px) {
  .cards.four { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; }
  .hero { padding: 80px 0 100px; }
  .shot { width: 38vw; }
}
@media (max-width: 560px) {
  .cards.three { grid-template-columns: 1fr; }
  .cards.four { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .btn-lg { width: 100%; }
  .hero {
    background-position: right center;
  }
}