*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #0a0a0a;
  --fg: #f5f5f5;
  --muted: #8a8a8a;
  --accent: #ff8a00;
  --like: #3ddc84;
  --dislike: #ff4d4f;
  --save: #ffd166;
  --card-bg: #141414;
  --card-border: #262626;
  --radius: 18px;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100dvh;
  width: 100vw;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  touch-action: none;
  overscroll-behavior: none;
}

[hidden] { display: none !important; }

body { padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }

header {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.25rem;
  padding-top: calc(env(safe-area-inset-top) + 1rem);
  font-size: 0.78rem; color: var(--muted);
  z-index: 10;
}

header button {
  background: transparent; color: var(--muted); border: 1px solid var(--card-border);
  border-radius: 999px; padding: 0.25rem 0.75rem; font-size: 0.72rem;
  font-family: inherit; cursor: pointer;
}

#cards {
  position: relative;
  height: 100dvh;
  width: 100vw;
}

.card {
  position: absolute;
  top: 5rem; left: 1rem; right: 1rem; bottom: 5rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow: hidden;
  display: flex; flex-direction: column; gap: 0.75rem;
  transition: transform 0.25s ease, opacity 0.25s ease, box-shadow 0.1s;
  will-change: transform;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.card .source {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent); font-weight: 600;
}

.card h2 {
  font-size: 1.35rem; font-weight: 700; line-height: 1.25; margin: 0;
  letter-spacing: -0.01em;
}

.card .summary { font-size: 1rem; line-height: 1.45; color: var(--fg); margin: 0; }

.card .why {
  font-size: 0.95rem; line-height: 1.55; color: #cfcfcf;
  border-left: 3px solid var(--accent);
  padding: 0.5rem 0 0.5rem 0.9rem;
  margin: 0.5rem 0;
  font-style: italic;
}

.card .meta {
  margin-top: auto; display: flex; gap: 0.75rem; align-items: center;
  font-size: 0.75rem; color: var(--muted);
}

.card .meta a { color: var(--muted); text-decoration: underline; }

.card .why { display: none; }
.card.expanded .why { display: block; }

.card.expanded { overflow-y: auto; }

.card .article {
  display: none;
  font-size: 0.88rem;
  line-height: 1.55;
  color: #bfbfbf;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--card-border);
  white-space: pre-wrap;
  word-break: break-word;
}
.card.expanded .article { display: block; }

.card .tap-hint {
  font-size: 0.68rem;
  color: var(--muted);
  text-align: center;
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
  opacity: 0.6;
}
.card.expanded .tap-hint::after { content: "TAP TO COLLAPSE"; }
.card:not(.expanded) .tap-hint::after { content: "TAP FOR DETAILS"; }

.card-indicator {
  position: absolute; top: 1.25rem; font-size: 0.85rem; font-weight: 700;
  border: 2px solid currentColor; padding: 0.25rem 0.6rem; border-radius: 6px;
  opacity: 0; transition: opacity 0.1s;
  letter-spacing: 0.06em;
}
.card-indicator.like    { right: 1.25rem; color: var(--like); transform: rotate(12deg); }
.card-indicator.dislike { left: 1.25rem;  color: var(--dislike); transform: rotate(-12deg); }
.card-indicator.save    { left: 50%; transform: translateX(-50%); color: var(--save); }

#hint {
  position: fixed; bottom: calc(env(safe-area-inset-bottom) + 1rem); left: 0; right: 0;
  text-align: center; font-size: 0.75rem; color: var(--muted);
  z-index: 5;
}

#auth, #empty {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  padding: 2rem;
}

.auth-card, #empty {
  max-width: 360px; text-align: center;
}

.auth-card h1 { margin: 0 0 0.5rem 0; font-weight: 700; letter-spacing: -0.02em; }
.auth-card p { color: var(--muted); font-size: 0.9rem; }
.auth-card input {
  width: 100%; padding: 0.75rem 1rem; margin-top: 0.5rem;
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: 12px; color: var(--fg); font-family: inherit; font-size: 1rem;
}
.auth-card button, #empty button {
  margin-top: 1rem; padding: 0.75rem 1.5rem;
  background: var(--accent); color: #000; border: none;
  border-radius: 999px; font-weight: 600; font-size: 0.95rem;
  font-family: inherit; cursor: pointer;
}