/* Lumen — feed di schede verticali. Bianco, tipografia editoriale, movimento morbido. */

:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f5f5f3;
  --ink: #111111;
  --ink-2: #3d3d3a;
  --muted: #76766f;
  --line: rgba(17, 17, 17, 0.08);
  --line-strong: rgba(17, 17, 17, 0.14);
  --shadow: 0 1px 2px rgba(17, 17, 17, 0.04), 0 12px 32px -8px rgba(17, 17, 17, 0.14), 0 32px 64px -24px rgba(17, 17, 17, 0.12);
  --orange: #d9480f;
  --chip-active-bg: #111111;
  --chip-active-fg: #ffffff;

  --t-scienza: #5b5bd6;
  --t-spazio: #2f4fd8;
  --t-salute: #d6336c;
  --t-storia: #b26b1f;
  --t-tecnologia: #0c8f8a;
  --t-natura: #2f9e44;

  --serif: "Instrument Serif", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --radius: 28px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --peek: 88px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0b0b0c;
  --surface: #161618;
  --surface-2: #1e1e21;
  --ink: #f4f4f1;
  --ink-2: #d2d2cc;
  --muted: #9a9a93;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -12px rgba(0, 0, 0, 0.7);
  --orange: #ff8a4c;
  --chip-active-bg: #f4f4f1;
  --chip-active-fg: #0b0b0c;
  --t-scienza: #9a9cff;
  --t-spazio: #7d95ff;
  --t-salute: #ff7aa3;
  --t-storia: #e3a35b;
  --t-tecnologia: #46c9c2;
  --t-natura: #6ccf7f;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; touch-action: manipulation; }
button:focus-visible, a:focus-visible, .card:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
a { color: inherit; }

.app { height: 100%; display: flex; flex-direction: column; max-width: 560px; margin: 0 auto; }

/* ---------- Testata ---------- */
.top {
  position: relative;
  z-index: 5;
  padding: calc(var(--safe-top) + 14px) 0 6px;
  background: var(--bg);
  transition: background-color 0.4s var(--ease);
}
.top-row { display: flex; align-items: center; justify-content: space-between; padding: 0 20px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 11px; flex: none;
  background:
    radial-gradient(circle at 30% 28%, #ffd8a8 0 18%, transparent 19%),
    conic-gradient(from 210deg, #ff922b, #f76707, #d9480f, #ff922b);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06), 0 6px 14px -6px rgba(217, 72, 15, 0.6);
}
.brand-name { font-family: var(--serif); font-weight: 400; font-size: 30px; line-height: 1; margin: 0; letter-spacing: -0.01em; }
.brand-date { margin: 3px 0 0; font-size: 12.5px; color: var(--muted); letter-spacing: 0.01em; }
.top-actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--surface-2);
  transition: transform 0.25s var(--spring), background-color 0.3s;
}
.icon-btn:active { transform: scale(0.9); }
.icon-btn svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn .i-sun { display: none; }
:root[data-theme="dark"] .icon-btn .i-sun { display: block; }
:root[data-theme="dark"] .icon-btn .i-moon { display: none; }

.streak {
  font-size: 12.5px; font-weight: 600; padding: 7px 11px; border-radius: 999px;
  background: var(--surface-2); color: var(--ink-2); font-variant-numeric: tabular-nums;
}

/* Banner nuovi contenuti: piccolo, arancione, solo testo */
.update-banner {
  display: flex; align-items: center; gap: 8px;
  margin: 10px auto 0; padding: 4px 10px;
  font-size: 13.5px; color: var(--orange); letter-spacing: 0.005em;
  animation: banner-in 0.6s var(--ease) both;
}
.update-banner strong { font-weight: 650; }
.pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); position: relative; }
.pulse::after {
  content: ""; position: absolute; inset: -4px; border-radius: 50%;
  border: 1.5px solid var(--orange); opacity: 0; animation: pulse 1.8s var(--ease) infinite;
}
@keyframes banner-in { from { opacity: 0; transform: translateY(-8px); } }
@keyframes pulse { 0% { transform: scale(0.4); opacity: 0.9; } 100% { transform: scale(1.6); opacity: 0; } }

/* Sezioni: controllo segmentato con indicatore che scorre */
.sections {
  position: relative; display: grid; grid-template-columns: 1fr 1fr;
  margin: 14px 20px 0; padding: 4px; border-radius: 14px; background: var(--surface-2);
}
.section-tab {
  position: relative; z-index: 1; height: 36px; border-radius: 10px;
  font-size: 14.5px; font-weight: 550; color: var(--muted);
  transition: color 0.3s var(--ease);
}
.section-tab[aria-selected="true"] { color: var(--ink); }
.section-thumb {
  position: absolute; top: 4px; bottom: 4px; left: 4px; width: calc(50% - 4px);
  border-radius: 10px; background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 4px 12px -4px rgba(0, 0, 0, 0.12);
  transition: transform 0.45s var(--ease), background-color 0.4s;
}
:root[data-theme="dark"] .section-thumb { background: #2b2b2f; }
.sections[data-active="losapevi"] .section-thumb { transform: translateX(100%); }

/* Filtri per argomento */
.chips {
  display: flex; gap: 8px; overflow-x: auto; padding: 12px 20px 8px;
  scrollbar-width: none; -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 16px, #000 calc(100% - 24px), transparent);
          mask-image: linear-gradient(90deg, transparent 0, #000 16px, #000 calc(100% - 24px), transparent);
}
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none; display: inline-flex; align-items: center; gap: 7px;
  height: 34px; padding: 0 14px; border-radius: 999px;
  font-size: 13.5px; font-weight: 550; color: var(--ink-2);
  box-shadow: inset 0 0 0 1px var(--line-strong);
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease), box-shadow 0.3s, transform 0.25s var(--spring);
}
.chip:active { transform: scale(0.94); }
.chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c, var(--ink)); }
.chip[aria-pressed="true"] { background: var(--chip-active-bg); color: var(--chip-active-fg); box-shadow: none; }

/* ---------- Feed ---------- */
.feed {
  position: relative;
  flex: 1; min-height: 0;
  overflow-y: auto; overscroll-behavior: contain;
  scroll-snap-type: y mandatory;
  scroll-padding-top: 10px;
  padding: 10px 16px calc(var(--peek) + var(--safe-bottom));
  scrollbar-width: none;
}
.feed::-webkit-scrollbar { display: none; }
.feed.is-refreshing .card { animation: refresh-in 0.7s var(--ease) backwards; animation-delay: calc(var(--i, 0) * 70ms); }
@keyframes refresh-in { from { opacity: 0; transform: translateY(40px) scale(0.97); } }

.card {
  --c: var(--ink);
  position: relative;
  display: flex; flex-direction: column;
  height: calc(var(--feed-h, 70vh) - var(--peek));
  min-height: 420px;
  margin-bottom: 14px;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  cursor: pointer;
  transform-origin: 50% 0;
  will-change: transform, filter;
  transition: box-shadow 0.4s var(--ease);
  animation: card-in 0.8s var(--ease) backwards;
  animation-delay: calc(var(--i, 0) * 70ms);
}
/* bordo sottile sopra l'illustrazione, così il contorno resta continuo */
.card::after { content: ""; position: absolute; inset: 0; z-index: 2; border-radius: inherit; box-shadow: inset 0 0 0 1px var(--line); pointer-events: none; }
@keyframes card-in { from { opacity: 0; transform: translateY(28px); } }
.card:active .card-art-inner { transform: scale(1.03); }

.card[data-topic="scienza"], .detail[data-topic="scienza"] { --c: var(--t-scienza); }
.card[data-topic="spazio"], .detail[data-topic="spazio"] { --c: var(--t-spazio); }
.card[data-topic="salute"], .detail[data-topic="salute"] { --c: var(--t-salute); }
.card[data-topic="storia"], .detail[data-topic="storia"] { --c: var(--t-storia); }
.card[data-topic="tecnologia"], .detail[data-topic="tecnologia"] { --c: var(--t-tecnologia); }
.card[data-topic="natura"], .detail[data-topic="natura"] { --c: var(--t-natura); }

/* Arte generativa per argomento: gradiente + motivo SVG */
.card-art { position: relative; flex: 0 0 38%; overflow: hidden; }
.card-art-inner, .detail-art {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 85% 0%, color-mix(in oklab, var(--c) 38%, transparent), transparent 60%),
    radial-gradient(90% 80% at 0% 100%, color-mix(in oklab, var(--c) 26%, transparent), transparent 65%),
    linear-gradient(160deg, color-mix(in oklab, var(--c) 10%, var(--surface)), color-mix(in oklab, var(--c) 22%, var(--surface)));
  transition: transform 0.6s var(--ease);
}
.card-art svg, .detail-art svg { position: absolute; inset: 0; width: 100%; height: 100%; color: var(--c); }
.card-art::after {
  content: ""; position: absolute; inset: auto 0 0; height: 40%;
  background: linear-gradient(to top, var(--surface), transparent);
}
.card-tags { position: absolute; z-index: 1; top: 16px; left: 16px; right: 16px; display: flex; justify-content: space-between; align-items: center; }
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  height: 28px; padding: 0 11px; border-radius: 999px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.02em;
  background: color-mix(in oklab, var(--surface) 78%, transparent);
  -webkit-backdrop-filter: blur(12px) saturate(1.4); backdrop-filter: blur(12px) saturate(1.4);
  color: var(--ink);
}
.tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c); }
.tag-new { color: var(--orange); }

.card-content { position: relative; flex: 1; min-height: 0; display: flex; flex-direction: column; padding: 4px 22px 20px; }
.eyebrow { font-size: 12.5px; color: var(--muted); letter-spacing: 0.01em; margin: 0 0 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(27px, 7.6vw, 34px); line-height: 1.06; letter-spacing: -0.012em;
  margin: 0 0 12px; text-wrap: balance;
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden;
}
.card-summary {
  margin: 0; color: var(--ink-2); font-size: 15.5px; line-height: 1.55; text-wrap: pretty;
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden;
}
.card-foot { margin-top: auto; padding-top: 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.read-more {
  display: inline-flex; align-items: center; gap: 6px; flex: none;
  height: 36px; padding: 0 14px 0 16px; border-radius: 999px;
  background: var(--ink); color: var(--bg); font-size: 13.5px; font-weight: 600;
}
.read-more svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.read-check { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 4px; }

/* Indicatore di solidità */
.solidity { display: inline-flex; align-items: center; gap: 8px; min-width: 0; font-size: 12.5px; font-weight: 550; color: var(--ink-2); }
.solidity-bars { display: inline-flex; gap: 3px; flex: none; }
.solidity-bars i { width: 5px; height: 14px; border-radius: 3px; background: var(--line-strong); }
.solidity[data-level="consolidato"] .solidity-bars i { background: #2f9e44; }
.solidity[data-level="solido"] .solidity-bars i:nth-child(-n+2) { background: #1c7ed6; }
.solidity[data-level="preliminare"] .solidity-bars i:first-child { background: #e8590c; }
:root[data-theme="dark"] .solidity[data-level="consolidato"] .solidity-bars i { background: #69db7c; }
:root[data-theme="dark"] .solidity[data-level="solido"] .solidity-bars i:nth-child(-n+2) { background: #74c0fc; }
:root[data-theme="dark"] .solidity[data-level="preliminare"] .solidity-bars i:first-child { background: #ff922b; }
.solidity span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Fine del feed / vuoto */
.feed-end, .empty { text-align: center; color: var(--muted); padding: 28px 24px 8px; font-size: 14px; }
.feed-end .serif, .empty .serif { display: block; font-family: var(--serif); font-size: 26px; color: var(--ink); margin-bottom: 4px; }
.empty { padding-top: 22vh; }
.skeleton { height: calc(var(--feed-h, 70vh) - var(--peek)); border-radius: var(--radius); background: linear-gradient(100deg, var(--surface-2) 40%, color-mix(in oklab, var(--surface-2) 60%, var(--bg)) 50%, var(--surface-2) 60%) 0 0 / 200% 100%; animation: shimmer 1.4s linear infinite; margin-bottom: 14px; }
@keyframes shimmer { to { background-position: -200% 0; } }

/* ---------- Dettaglio ---------- */
.detail {
  --c: var(--ink);
  position: fixed; inset: 0; z-index: 50;
  background: var(--bg);
  overflow: hidden;
}
.detail-scroll { position: absolute; inset: 0; overflow-y: auto; overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }
.detail-hero { position: relative; height: calc(34vh + var(--safe-top)); min-height: 230px; max-height: 360px; overflow: hidden; }
.detail-hero::after { content: ""; position: absolute; inset: auto 0 0; height: 55%; background: linear-gradient(to top, var(--bg), transparent); }
.detail-close {
  position: fixed; z-index: 3; top: calc(var(--safe-top) + 14px); right: max(16px, calc(50vw - 264px));
  background: color-mix(in oklab, var(--surface) 75%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.4); backdrop-filter: blur(14px) saturate(1.4);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}
.detail-body { position: relative; z-index: 1; max-width: 640px; margin: -72px auto 0; padding: 0 22px calc(56px + var(--safe-bottom)); }
.detail-body > * { animation: rise 0.7s var(--ease) both; }
.detail-body > *:nth-child(2) { animation-delay: 0.05s; }
.detail-body > *:nth-child(3) { animation-delay: 0.1s; }
.detail-body > *:nth-child(4) { animation-delay: 0.15s; }
.detail-body > *:nth-child(n+5) { animation-delay: 0.2s; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } }

.detail-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 14px; }
.detail-meta .tag { background: var(--surface-2); -webkit-backdrop-filter: none; backdrop-filter: none; }
.detail-date { font-size: 13px; color: var(--muted); }
.detail-title { font-family: var(--serif); font-weight: 400; font-size: clamp(34px, 9vw, 46px); line-height: 1.04; letter-spacing: -0.015em; margin: 0 0 16px; text-wrap: balance; }
.detail-lead { font-size: 19px; line-height: 1.5; color: var(--ink-2); margin: 0 0 24px; text-wrap: pretty; }

.solidity-panel {
  display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; align-items: center;
  padding: 16px 18px; border-radius: 18px; background: var(--surface-2); margin-bottom: 30px;
}
.solidity-panel .solidity { grid-row: span 2; }
.solidity-panel .solidity-bars i { width: 6px; height: 26px; }
.solidity-panel strong { font-size: 15px; font-weight: 650; }
.solidity-panel p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.45; }

.detail-text p { font-size: 17.5px; line-height: 1.7; margin: 0 0 18px; color: var(--ink); text-wrap: pretty; }

.quote { position: relative; margin: 28px 0; padding: 4px 0 4px 22px; border-left: 2px solid var(--c); }
.quote p { margin: 0; font-family: var(--serif); font-size: 23px; line-height: 1.3; font-style: italic; }
.quote .translation { margin-top: 8px; font-family: var(--sans); font-style: normal; font-size: 14.5px; line-height: 1.5; color: var(--muted); }
.quote cite { display: block; margin-top: 8px; font-size: 12.5px; font-style: normal; color: var(--muted); letter-spacing: 0.02em; }

.section-label { font-size: 12px; font-weight: 650; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 36px 0 12px; }
.sources { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.sources li { border-bottom: 1px solid var(--line); }
.sources a { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 15px 2px; text-decoration: none; }
.sources a:active { opacity: 0.6; }
.src-name { display: block; font-weight: 600; font-size: 15px; }
.src-host { display: block; font-size: 13px; color: var(--muted); word-break: break-all; }
.sources svg { width: 18px; height: 18px; flex: none; fill: none; stroke: var(--muted); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.disclaimer { margin-top: 28px; font-size: 12.5px; color: var(--muted); line-height: 1.5; display: flex; gap: 10px; }
.disclaimer svg { width: 16px; height: 16px; flex: none; margin-top: 1px; fill: none; stroke: currentColor; stroke-width: 1.8; }

@media (min-width: 700px) {
  .card-title { font-size: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; transition-duration: 0.01ms !important; }
}