:root{
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: rgba(10,10,10,.65);
  --line: rgba(10,10,10,.14);

  --pad: clamp(16px, 3vw, 34px);
  --radius: 18px;
  --shadow: 0 10px 30px rgba(0,0,0,.08);

  --cardW: clamp(240px, 32vw, 420px);
  --cardH: 440px; /* doubled from 220px */
}

*{ box-sizing: border-box; }
html,body{ height: 100%; }
body{
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

/* Top header */
.top{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.top__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 16px;
  padding: 12px var(--pad);
}
.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: .2px;
}
.brand__mark{
  display:inline-grid;
  place-items:center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.nav{
  display:flex;
  gap: 14px;
  align-items:center;
}
.nav a{
  text-decoration:none;
  color: var(--fg);
  font-weight: 600;
  font-size: 14px;
  opacity: .8;
}
.nav a:hover{ opacity: 1; text-decoration: underline; }
.top__right{ display:flex; gap: 10px; }

/* Buttons */
.btn{
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg);
  padding: 10px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}
.btn:hover{ transform: translateY(-1px); }
.btn:active{ transform: translateY(0px); }
.btn--ghost{
  background: rgba(255,255,255,.6);
}

/* Feed + segments */
.feed{
  min-height: 100vh;
}

.segment{
  padding: calc(var(--pad) + 18px) var(--pad);
  border-bottom: 1px solid var(--line);
  position: relative;
}

.segment--dark{
  background: #0a0a0a;
  color: #ffffff;
  border-bottom-color: rgba(255,255,255,.12);
}
.segment--dark .muted{ color: rgba(255,255,255,.7); }
.segment--dark .btn{
  border-color: rgba(255,255,255,.18);
  color: #ffffff;
  background: rgba(255,255,255,.06);
}
.segment--dark .btn--ghost{ background: rgba(255,255,255,.08); }

.segment__head{
  display:flex;
  align-items:flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}
.segment__title{
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.segment__sub{
  margin: 8px 0 0 0;
  max-width: 70ch;
}
.muted{ color: var(--muted); font-size: 14px; }

/* Horizontal scroller */
.hscroll{
  display:flex;
  gap: 14px;
  overflow-x: auto;
  padding: 12px 2px 18px 2px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.hscroll::-webkit-scrollbar{ height: 10px; }
.hscroll::-webkit-scrollbar-thumb{
  background: rgba(0,0,0,.25);
  border-radius: 999px;
}
.segment--dark .hscroll::-webkit-scrollbar-thumb{
  background: rgba(255,255,255,.25);
}

.card{
  flex: 0 0 auto;
  width: var(--cardW);
  height: var(--cardH);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.7);
  box-shadow: var(--shadow);
  padding: 18px;
  scroll-snap-align: start;
  position: relative;
  overflow: hidden;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
}

.segment--dark .card{
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.14);
  box-shadow: none;
}

.card__kicker{
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  opacity: .8;
}
.card__title{
  margin: 10px 0 8px 0;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.card__body{
  margin: 0;
  font-size: 14px;
  line-height: 1.45;
  opacity: .9;
}
.card__actions{
  display:flex;
  gap: 10px;
  margin-top: 14px;
}
.pill{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  font-weight: 600;
  font-size: 12px;
  opacity: .9;
}
.segment--dark .pill{
  border-color: rgba(255,255,255,.18);
}

/* Big corner label */
.segment__index{
  position:absolute;
  right: var(--pad);
  top: 16px;
  font-weight: 700;
  letter-spacing: .08em;
  opacity: .35;
  font-size: 12px;
}

/* Footer */
.footer{
  border-top: 1px solid var(--line);
  padding: 18px var(--pad);
}
.footer__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
}

/* Mobile tweaks */
@media (max-width: 760px){
  .nav{ display:none; }
  .card{ height: 480px; }
}