/* tanso.news — editorial masonry, ethereal-blue palette, sharp angles, morph transitions */

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

:root {
  --sky: #d8e4f0;
  --sky-light: #e4ecf4;
  --sky-deep: #4a7aaa;
  --coral: #d47a60;
  --cloud: #f4f8fc;
  --ink: #1a2a3a;
  --steel: #6a7a8a;
  --accent-light: #e8f0f8;
  --hover: #e8f0f8;
}

html, body {
  background: var(--sky-light);
  color: var(--ink);
  font-family: 'Source Sans 3', system-ui, sans-serif;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body { opacity: 0; animation: pageIn 0.7s ease forwards; }
@keyframes pageIn { to { opacity: 1; } }

.mono {
  font-family: 'IBM Plex Mono', 'Share Tech Mono', monospace;
  letter-spacing: 0.01em;
}

a { color: var(--sky-deep); text-decoration: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 1.6rem 2rem;
  overflow: hidden;
}

.sky-grad {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 25% 15%, rgba(255,255,255,0.7), transparent 55%),
    radial-gradient(ellipse at 75% 80%, rgba(212,122,96,0.18), transparent 55%),
    linear-gradient(180deg, #d8e4f0 0%, #e4ecf4 60%, #f4f8fc 100%);
  z-index: -1;
}

.sky-grad::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 12% 28%, rgba(255,255,255,0.55) 0, transparent 8%),
    radial-gradient(circle at 32% 18%, rgba(255,255,255,0.4) 0, transparent 6%),
    radial-gradient(circle at 78% 38%, rgba(255,255,255,0.45) 0, transparent 7%),
    radial-gradient(circle at 88% 12%, rgba(255,255,255,0.3) 0, transparent 5%);
  filter: blur(8px);
  opacity: 0.9;
}

.hero-inner {
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.ribbon {
  display: inline-flex;
  gap: 0.6rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
  padding: 0.4rem 0.8rem;
  background: rgba(255,255,255,0.55);
  border: 1px solid rgba(74,122,170,0.18);
  border-radius: 2px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  margin-bottom: 1.6rem;
  opacity: 0;
  animation: rise 0.8s ease 0.2s forwards;
}

.ribbon .dot { color: var(--coral); }

.brand {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(40px, 9vw, 120px);
  line-height: 0.95;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.5rem;
}

.b-tanso { color: var(--ink); opacity: 0; animation: rise 0.9s ease 0.4s forwards; }
.b-news  { color: var(--sky-deep); opacity: 0; animation: rise 0.9s ease 0.6s forwards; }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.lede {
  font-size: clamp(17px, 1.8vw, 21px);
  color: var(--ink);
  max-width: 60ch;
  margin-bottom: 2.6rem;
  opacity: 0;
  animation: rise 0.9s ease 0.8s forwards;
}

/* ---------- Category nav ---------- */
.cat-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.cat-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  background: var(--cloud);
  border: 1px solid rgba(74,122,170,0.22);
  border-radius: 2px;
  color: var(--ink);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
  opacity: 0;
  animation: catRise 0.6s ease forwards;
}

.cat-btn svg { color: var(--sky-deep); transition: color 0.3s ease; }

.cat-btn:nth-child(1) { animation-delay: 1.0s; }
.cat-btn:nth-child(2) { animation-delay: 1.1s; }
.cat-btn:nth-child(3) { animation-delay: 1.2s; }
.cat-btn:nth-child(4) { animation-delay: 1.3s; }
.cat-btn:nth-child(5) { animation-delay: 1.4s; }
.cat-btn:nth-child(6) { animation-delay: 1.5s; }

@keyframes catRise {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.cat-btn:hover {
  background: var(--accent-light);
  border-color: var(--sky-deep);
}

.cat-btn.is-active {
  background: var(--ink);
  color: var(--cloud);
  border-color: var(--ink);
}

.cat-btn.is-active svg { color: var(--coral); }

/* ---------- Sharp-angle divider ---------- */
.angle-divider {
  height: 60px;
  background: var(--sky-light);
  clip-path: polygon(0 0, 100% 40%, 100% 100%, 0 100%);
  margin-top: -1px;
}

/* ---------- Feed ---------- */
main { background: var(--sky-light); }

.feed {
  max-width: 1180px;
  margin: 0 auto;
  padding: 4rem 1.6rem 6rem;
}

.feed-head {
  margin-bottom: 2.4rem;
}

.kicker {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 0.6rem;
}

.feed-head h2 {
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ---------- Masonry ---------- */
.masonry {
  columns: 3;
  column-gap: 1.4rem;
}

.card {
  break-inside: avoid;
  margin-bottom: 1.4rem;
  background: var(--cloud);
  border: 1px solid rgba(74,122,170,0.14);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition:
    transform 400ms ease,
    box-shadow 400ms ease,
    opacity 400ms ease;
  display: block;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(26,42,58,0.08);
}

.card.is-hidden {
  opacity: 0;
  transform: scale(0.92);
  pointer-events: none;
  height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.card-img {
  width: 100%;
  height: 200px;
  background-size: cover;
  background-position: center;
  position: relative;
}

.card-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(26,42,58,0.18));
}

.card-img.tall { height: 280px; }

.card-body {
  padding: 1.2rem 1.3rem 1.4rem;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.cat-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.18rem 0.5rem 0.18rem 0.4rem;
  border-radius: 2px;
  background: var(--accent-light);
  color: var(--sky-deep);
}

.cat-chip svg { color: inherit; }

.cat-chip.atmosphere { color: #4a7aaa; background: #e0ecf6; }
.cat-chip.industry   { color: #6a5a4a; background: #efe5d8; }
.cat-chip.policy     { color: #4a6a8a; background: #dfe8f0; }
.cat-chip.research   { color: #4a7a6a; background: #d8ead8; }
.cat-chip.markets    { color: #d47a60; background: #f4dcd0; }

.card-meta time {
  font-size: 0.72rem;
  color: var(--steel);
}

.card h3 {
  font-family: 'Share Tech Mono', monospace;
  font-weight: 400;
  font-size: clamp(15px, 1.4vw, 20px);
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: 0.6rem;
  letter-spacing: -0.005em;
}

.card.lg h3 { font-size: clamp(18px, 1.6vw, 24px); }

.card p {
  font-size: 0.92rem;
  color: var(--ink);
  opacity: 0.86;
  margin-bottom: 0.6rem;
}

.card .byline {
  font-size: 0.74rem;
  color: var(--steel);
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card .read {
  color: var(--coral);
  font-weight: 500;
}

.hl {
  background: rgba(212,122,96,0.18);
  padding: 0 0.25rem;
  color: var(--coral);
  font-weight: 500;
}

/* ---------- Card sharp angle accent ---------- */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  background: var(--coral);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  z-index: 2;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.card:hover::before { opacity: 0.85; }

/* ---------- Empty state ---------- */
.feed-empty {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--steel);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */
.site-foot {
  background: var(--ink);
  color: var(--cloud);
  padding: 4rem 1.6rem;
  position: relative;
  clip-path: polygon(0 28px, 100% 0, 100% 100%, 0 100%);
}

.foot-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.foot-mark {
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.6rem;
  display: flex;
  gap: 0.4rem;
  letter-spacing: 0.04em;
  color: var(--cloud);
}

.foot-mark .d-coral { color: var(--coral); }

.foot-blurb {
  max-width: 60ch;
  color: rgba(244,248,252,0.78);
}

.foot-meta {
  font-size: 0.78rem;
  color: rgba(244,248,252,0.6);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  letter-spacing: 0.06em;
}

.foot-meta .d-coral { color: var(--coral); }

.foot-meta a { color: rgba(244,248,252,0.78); }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .masonry { columns: 2; }
}

@media (max-width: 600px) {
  .masonry { columns: 1; }
  .brand { font-size: clamp(36px, 14vw, 80px); }
  .cat-btn span { font-size: 0.78rem; }
  .card-img { height: 160px; }
  .card-img.tall { height: 220px; }
}