/* ============================================================================
   AI INTELLIGENCE — design system
   Space Grotesk (display/UI) · Space Mono (metadata) · Newsreader (long-read)
   ========================================================================== */

:root {
  /* palette — light */
  --canvas: #f6f5f1;
  --canvas-2: #efede7;
  --card: #ffffff;
  --border: #e6e4dd;
  --border-strong: #d8d5cc;
  --ink: #13141a;
  --ink-2: #3a3b44;
  --body: #54555f;
  --muted: #8a8780;
  --accent: #5b4af5;
  --accent-deep: #4636d6;
  --accent-tint: #efecff;
  --accent-glow: rgba(91, 74, 245, 0.14);
  --green: #0fa968;
  --amber: #e0901b;
  --cyan: #0b9fc4;

  --shadow-sm: 0 1px 2px rgba(19, 20, 26, 0.04);
  --shadow: 0 4px 20px rgba(19, 20, 26, 0.06);
  --shadow-lg: 0 18px 48px rgba(19, 20, 26, 0.12);

  --sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'Space Mono', 'SF Mono', 'JetBrains Mono', Menlo, monospace;
  --serif: 'Newsreader', Georgia, 'Times New Roman', serif;

  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #0b0c10;
    --canvas-2: #0f1015;
    --card: #15161c;
    --border: #24262f;
    --border-strong: #2e313c;
    --ink: #f3f1ea;
    --ink-2: #cfcdc6;
    --body: #a6a59e;
    --muted: #6d6c66;
    --accent: #7b6bff;
    --accent-deep: #6453ff;
    --accent-tint: #1a1730;
    --accent-glow: rgba(123, 107, 255, 0.20);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  }
}

/* ── reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--canvas);
  color: var(--ink);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { max-width: 100%; display: block; }
::selection { background: var(--accent); color: #fff; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ============================================================================
   MASTHEAD
   ========================================================================== */
.masthead {
  position: sticky;
  top: 0;
  z-index: 90;
  background: color-mix(in srgb, var(--canvas) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
}
.masthead-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.4px;
  color: var(--ink);
}
.wordmark .mark {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  display: grid;
  place-items: center;
  color: #fff;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 2px 10px var(--accent-glow);
}
.wordmark .sub {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}
.nav-actions { display: flex; align-items: center; gap: 8px; }
.btn {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 13.5px;
  border-radius: 999px;
  padding: 9px 20px;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease, color .12s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-1px); box-shadow: 0 6px 18px var(--accent-glow); }
.btn-ghost { color: var(--ink-2); border: 1px solid var(--border-strong); }
.btn-ghost:hover { border-color: var(--ink-2); color: var(--ink); }

/* ============================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: "";
  position: absolute;
  top: -40%; left: 50%;
  width: 720px; height: 520px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, var(--accent-glow), transparent 68%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px 28px 52px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero-eyebrow .pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 var(--accent-glow); }
  70% { box-shadow: 0 0 0 9px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.hero h1 {
  font-size: clamp(38px, 6vw, 66px);
  line-height: 1.02;
  letter-spacing: -2px;
  font-weight: 700;
  color: var(--ink);
  max-width: 14ch;
}
.hero h1 .accent {
  background: linear-gradient(120deg, var(--accent), var(--accent-deep) 60%, var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-tagline {
  font-family: var(--serif);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.5;
  color: var(--body);
  max-width: 56ch;
  margin-top: 22px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 30px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .3px;
}
.hero-meta b { color: var(--ink-2); font-weight: 700; }

/* ============================================================================
   TOPIC FILTER BAR
   ========================================================================== */
.topic-bar {
  position: sticky;
  top: 64px;
  z-index: 80;
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topic-bar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.topic-bar-inner::-webkit-scrollbar { display: none; }
.pill {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .3px;
  font-weight: 400;
  color: var(--body);
  background: var(--card);
  border: 1px solid var(--border-strong);
  padding: 8px 16px;
  border-radius: 999px;
  transition: all .14s ease;
  white-space: nowrap;
}
.pill:hover { border-color: var(--accent); color: var(--accent); }
.pill.active { background: var(--ink); border-color: var(--ink); color: var(--canvas); }
.pill .n {
  font-size: 10.5px;
  opacity: .65;
  font-weight: 700;
}
.pill.active .n { opacity: .8; }

/* ============================================================================
   FEED
   ========================================================================== */
.feed { padding: 44px 0 80px; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 8px 0 22px;
}
.section-head .label {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}
.section-head .rule {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── featured lead ── */
.featured {
  position: relative;
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s;
}
.featured:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--border-strong); }
.featured-body { padding: 38px 40px; display: flex; flex-direction: column; }
.featured-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.featured h2 {
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.08;
  letter-spacing: -1px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
}
.featured p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.62;
  color: var(--body);
  margin-bottom: 24px;
}
.featured-foot { margin-top: auto; display: flex; align-items: center; gap: 14px; }
.featured-side {
  position: relative;
  background:
    radial-gradient(120% 120% at 80% 10%, var(--accent-tint), transparent 60%),
    linear-gradient(160deg, var(--canvas-2), var(--card));
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 34px 32px;
}
.score-orb {
  align-self: flex-end;
  font-family: var(--mono);
  font-weight: 700;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}
.score-orb .num {
  font-size: 60px;
  line-height: 1;
  letter-spacing: -3px;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.score-orb .of { font-size: 12px; color: var(--muted); letter-spacing: 1px; }
.featured-tags { display: flex; flex-wrap: wrap; gap: 6px; }

/* ── grid cards ── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 24px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s;
  opacity: 0;
  animation: rise .5s ease forwards;
}
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--border-strong); }
.card::before {
  content: "";
  position: absolute; left: 0; top: 22px; bottom: 22px;
  width: 3px; border-radius: 0 3px 3px 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity .15s;
}
.card:hover::before { opacity: 1; }
.card-top { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.src {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .6px;
  text-transform: uppercase;
  color: var(--ink-2);
}
.dot { width: 3px; height: 3px; border-radius: 50%; background: var(--muted); }
.time { font-family: var(--mono); font-size: 10.5px; color: var(--muted); }
.badge {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-tint);
  border-radius: 999px;
  padding: 2px 9px;
}
.card h3 {
  font-size: 18px;
  line-height: 1.25;
  letter-spacing: -.4px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}
.card .excerpt {
  font-size: 14px;
  line-height: 1.55;
  color: var(--body);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 16px;
}
.card .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.chip {
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .5px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-tint);
  border-radius: 5px;
  padding: 3px 8px;
}
.chip.muted { color: var(--muted); background: var(--canvas-2); }

/* ── skeleton ── */
.sk {
  background: linear-gradient(90deg, var(--canvas-2) 25%, var(--border) 37%, var(--canvas-2) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: 6px;
  height: 14px;
}
@keyframes shimmer { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* ── empty ── */
.empty { text-align: center; padding: 80px 20px; color: var(--muted); }
.empty .ico { font-size: 40px; margin-bottom: 12px; }

/* ============================================================================
   ARTICLE (item detail)
   ========================================================================== */
.article { max-width: 720px; margin: 0 auto; padding: 40px 28px 90px; }
.back {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .5px;
  color: var(--muted); margin-bottom: 30px; transition: color .14s, gap .14s;
}
.back:hover { color: var(--ink); gap: 11px; }
.article-eyebrow {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 18px;
}
.article-src {
  font-family: var(--mono); font-size: 11px; font-weight: 700;
  letter-spacing: .6px; text-transform: uppercase;
  background: var(--ink); color: var(--canvas);
  padding: 4px 12px; border-radius: 999px;
}
.article-date { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.article-score {
  font-family: var(--mono); font-size: 12px; font-weight: 700;
  color: var(--accent); background: var(--accent-tint);
  padding: 3px 12px; border-radius: 999px; margin-left: auto;
}
.article h1 {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.08; letter-spacing: -1.4px; font-weight: 700;
  color: var(--ink); margin-bottom: 20px;
}
.article-chips { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 34px; }
.eyebrow-label {
  font-family: var(--mono); font-size: 10.5px; font-weight: 700;
  letter-spacing: 1.6px; text-transform: uppercase; color: var(--muted);
  margin-bottom: 12px; display: flex; align-items: center; gap: 9px;
}
.eyebrow-label::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.prose {
  font-family: var(--serif);
  font-size: 18.5px; line-height: 1.72; color: var(--ink-2);
  margin-bottom: 38px;
}
.prose.lead::first-letter {
  /* drop cap on first block */
  initial-letter: 2;
  font-weight: 700; color: var(--accent);
  margin-right: 8px;
}
.callout {
  position: relative;
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: var(--radius);
  padding: 26px 28px 26px 30px;
  margin-bottom: 38px;
  overflow: hidden;
}
.callout::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(var(--accent), var(--accent-deep));
}
.callout .eyebrow-label { color: var(--accent); }
.callout .eyebrow-label::after { background: color-mix(in srgb, var(--accent) 25%, transparent); }
.callout p {
  font-family: var(--serif); font-style: italic;
  font-size: 18px; line-height: 1.62; color: var(--ink);
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 44px; }
.btn-lg { padding: 13px 26px; font-size: 14.5px; border-radius: 12px; }
.btn-lg.btn-primary { box-shadow: 0 6px 22px var(--accent-glow); }
.btn-outline { border: 1px solid var(--border-strong); color: var(--ink-2); font-weight: 600; }
.btn-outline:hover { border-color: var(--ink); color: var(--ink); transform: translateY(-1px); }
.btn-lg.btn-outline, .btn-lg.btn-primary { transition: transform .12s, box-shadow .12s, background .12s, border-color .12s; }

/* commentary */
.commentary {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 32px;
  margin-bottom: 44px;
  box-shadow: var(--shadow-sm);
}
.commentary .eyebrow-label { color: var(--green); }
.commentary .eyebrow-label .gdot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.commentary-text {
  font-family: var(--serif);
  font-size: 17.5px; line-height: 1.74; color: var(--ink-2);
  white-space: pre-wrap;
}
.gen-line { display: flex; align-items: center; gap: 12px; color: var(--muted); font-family: var(--mono); font-size: 13px; }
.gen-line .spin {
  width: 15px; height: 15px; border-radius: 50%;
  border: 2px solid var(--border-strong); border-top-color: var(--accent);
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── subscribe block ── */
.sub-block {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink), color-mix(in srgb, var(--ink) 80%, var(--accent-deep)));
  border-radius: var(--radius);
  padding: 38px 36px;
  color: #fff;
}
.sub-block::before {
  content: ""; position: absolute; right: -60px; top: -60px;
  width: 240px; height: 240px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
}
.sub-block h3 {
  position: relative;
  font-size: 24px; letter-spacing: -.6px; font-weight: 700; margin-bottom: 8px;
}
.sub-block p { position: relative; color: rgba(255,255,255,.66); font-size: 15px; margin-bottom: 22px; max-width: 46ch; }
.sub-form { position: relative; display: flex; gap: 8px; flex-wrap: wrap; }
.sub-form input {
  flex: 1; min-width: 220px;
  font-family: var(--sans); font-size: 14.5px;
  padding: 13px 18px; border-radius: 12px;
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.16);
  color: #fff; outline: none; transition: border-color .14s, background .14s;
}
.sub-form input::placeholder { color: rgba(255,255,255,.4); }
.sub-form input:focus { border-color: var(--accent); background: rgba(255,255,255,.1); }
.sub-form .btn { padding: 13px 26px; border-radius: 12px; }
.form-msg { position: relative; font-family: var(--mono); font-size: 12.5px; margin-top: 14px; min-height: 18px; }
.form-msg.ok { color: #51e0a3; }
.form-msg.err { color: #ff8d8d; }

/* ============================================================================
   FOOTER
   ========================================================================== */
.site-foot {
  border-top: 1px solid var(--border);
  background: var(--canvas-2);
}
.foot-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 40px 28px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.foot-inner .left { display: flex; align-items: center; gap: 12px; }
.foot-tag { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: .4px; }

/* ============================================================================
   CONFIRMED PAGE
   ========================================================================== */
.confirmed {
  min-height: 72vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center; padding: 40px 24px;
}
.confirmed .seal {
  width: 76px; height: 76px; border-radius: 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  display: grid; place-items: center; color: #fff; font-size: 36px;
  box-shadow: 0 14px 40px var(--accent-glow); margin-bottom: 28px;
}
.confirmed h1 { font-size: clamp(30px, 5vw, 44px); letter-spacing: -1.2px; margin-bottom: 14px; }
.confirmed p { font-family: var(--serif); font-size: 18px; color: var(--body); max-width: 44ch; line-height: 1.6; }
.confirmed a.btn { margin-top: 32px; }

/* ============================================================================
   MODAL
   ========================================================================== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: color-mix(in srgb, var(--ink) 55%, transparent);
  backdrop-filter: blur(6px);
  display: grid; place-items: center; padding: 20px;
  animation: fade .18s ease;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.modal-overlay.hidden { display: none; }
.modal {
  position: relative; width: 100%; max-width: 460px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 22px; padding: 38px 36px;
  box-shadow: var(--shadow-lg);
  animation: pop .2s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes pop { from { opacity: 0; transform: translateY(12px) scale(.97); } to { opacity: 1; transform: none; } }
.modal .x { position: absolute; top: 18px; right: 22px; font-size: 22px; color: var(--muted); line-height: 1; }
.modal .x:hover { color: var(--ink); }
.modal .mark { width: 34px; height: 34px; border-radius: 9px; background: linear-gradient(135deg,var(--accent),var(--accent-deep)); display:grid; place-items:center; color:#fff; font-family:var(--mono); font-weight:700; margin-bottom: 18px; }
.modal h2 { font-size: 23px; letter-spacing: -.6px; margin-bottom: 8px; }
.modal p { color: var(--body); font-size: 14.5px; line-height: 1.55; margin-bottom: 22px; }
.modal .sub-form input {
  background: var(--canvas-2); border: 1px solid var(--border-strong); color: var(--ink);
}
.modal .sub-form input::placeholder { color: var(--muted); }
.modal .sub-form input:focus { border-color: var(--accent); }

/* ============================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 820px) {
  .featured { grid-template-columns: 1fr; }
  .featured-side { border-left: none; border-top: 1px solid var(--border); flex-direction: row; align-items: center; }
  .score-orb { align-self: center; flex-direction: row; align-items: baseline; gap: 6px; }
  .score-orb .num { font-size: 40px; }
}
@media (max-width: 560px) {
  .wrap, .masthead-inner, .topic-bar-inner, .hero-inner, .foot-inner { padding-left: 18px; padding-right: 18px; }
  .article { padding-left: 18px; padding-right: 18px; }
  .hero-inner { padding-top: 44px; padding-bottom: 38px; }
  .featured-body { padding: 28px 24px; }
  .wordmark .sub { display: none; }
  .actions .btn-lg { width: 100%; text-align: center; }
}