/* =========================================================================
   iyu — AI, explained.  Design system
   Clean-room editorial theme. No external assets required.
   ========================================================================= */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { min-height: 100%; line-height: 1.6; text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* ---- Tokens: light (default) ---- */
:root {
  --bg:        #f4efe6;
  --bg-2:      #ede6d8;
  --surface:   #fbf8f2;
  --surface-2: #fffdf8;
  --ink:       #24211c;
  --ink-soft:  #55504733;
  --muted:     #6d675b;
  --faint:     #9a9282;
  --line:      #d8cfbd;
  --line-soft: #e6ddcc;
  --accent:    #c85a34;   /* terracotta */
  --accent-ink:#a8451f;
  --accent-wash:#f6e6dd;
  --green:     #4f7a52;
  --green-wash:#e2ecdf;
  --dark-panel:#2a201b;   /* hero/dark cards even in light mode */
  --dark-panel-ink:#f4efe6;
  --shadow:    0 1px 2px rgba(40,32,24,.05), 0 8px 30px rgba(40,32,24,.06);
  --shadow-lg: 0 4px 12px rgba(40,32,24,.10), 0 24px 60px rgba(40,32,24,.12);
  --radius:    18px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --maxw:      1180px;
  --font-sans: "Space Grotesk", ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  --font-body: ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
}

/* ---- Tokens: dark ---- */
:root[data-theme="dark"] {
  --bg:        #171310;
  --bg-2:      #1f1a15;
  --surface:   #211b16;
  --surface-2: #29221c;
  --ink:       #f0e9dc;
  --muted:     #b3a893;
  --faint:     #837a68;
  --line:      #3a3128;
  --line-soft: #2c251e;
  --accent:    #e07a4f;
  --accent-ink:#f0966c;
  --accent-wash:#3a251b;
  --green:     #7fae82;
  --green-wash:#25332406;
  --green-wash:#243026;
  --dark-panel:#0f0c0a;
  --dark-panel-ink:#f0e9dc;
  --shadow:    0 1px 2px rgba(0,0,0,.3), 0 8px 30px rgba(0,0,0,.35);
  --shadow-lg: 0 4px 12px rgba(0,0,0,.4), 0 24px 60px rgba(0,0,0,.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:#171310; --bg-2:#1f1a15; --surface:#211b16; --surface-2:#29221c;
    --ink:#f0e9dc; --muted:#b3a893; --faint:#837a68; --line:#3a3128; --line-soft:#2c251e;
    --accent:#e07a4f; --accent-ink:#f0966c; --accent-wash:#3a251b;
    --green:#7fae82; --green-wash:#243026; --dark-panel:#0f0c0a; --dark-panel-ink:#f0e9dc;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 30px rgba(0,0,0,.35);
    --shadow-lg:0 4px 12px rgba(0,0,0,.4),0 24px 60px rgba(0,0,0,.5);
  }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  transition: background .3s ease, color .3s ease;
}

/* ---- Layout ---- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(18px, 4vw, 40px); }
.section { padding-block: clamp(40px, 6vw, 72px); }
.stack > * + * { margin-top: 1rem; }
.hidden { display: none !important; }

/* ---- Type ---- */
h1, h2, h3, h4, .display { font-family: var(--font-sans); font-weight: 600; line-height: 1.08; letter-spacing: -0.02em; }
.eyebrow { font-family: var(--font-sans); font-size: .72rem; font-weight: 600; letter-spacing: .18em;
  text-transform: uppercase; color: var(--accent); display: inline-flex; align-items: center; gap: .5em; }
.eyebrow.muted { color: var(--faint); }
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); display: inline-block; }
.lead { font-size: clamp(1.02rem, 1.4vw, 1.18rem); color: var(--muted); }

/* ---- Header ---- */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--line-soft); }
.nav { display: flex; align-items: center; gap: 1.2rem; height: 68px; }
.brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; margin-right: .5rem; }
.brand__mark { position: relative; width: 40px; height: 40px; display: grid; place-items: center;
  font-family: var(--font-sans); font-weight: 700; font-size: 1.15rem; color: var(--ink); }
.brand__mark::before, .brand__mark::after { content:""; position:absolute; width:12px; height:12px; border:2px solid var(--accent); }
.brand__mark::before { top:0; left:0; border-right:0; border-bottom:0; }
.brand__mark::after { bottom:0; right:0; border-left:0; border-top:0; }
.brand__name { line-height: 1.05; }
.brand__name b { font-family: var(--font-sans); font-weight: 700; letter-spacing: .12em; font-size: .82rem; text-transform: uppercase; }
.brand__name span { display:block; font-size:.62rem; letter-spacing:.16em; text-transform:uppercase; color: var(--faint); }
.nav__links { display: flex; align-items: center; gap: .2rem; margin-inline: auto; }
.nav__links a { text-decoration: none; font-family: var(--font-sans); font-weight: 500; font-size: .92rem;
  color: var(--muted); padding: .5rem .8rem; border-radius: var(--radius-pill); transition: .15s; }
.nav__links a:hover { color: var(--ink); background: var(--bg-2); }
.nav__links a.active { color: var(--ink); background: var(--surface-2); box-shadow: var(--shadow); }
.nav__tools { display: flex; align-items: center; gap: .5rem; }

.langset { display: inline-flex; background: var(--surface-2); border: 1px solid var(--line-soft); border-radius: var(--radius-pill); padding: 3px; }
.langset button { border: 0; background: transparent; color: var(--faint); font-family: var(--font-sans); font-weight: 600;
  font-size: .78rem; padding: .28rem .6rem; border-radius: var(--radius-pill); cursor: pointer; }
.langset button.active { background: var(--accent); color: #fff; }

.iconbtn { width: 40px; height: 40px; display: grid; place-items: center; border-radius: var(--radius-pill);
  border: 1px solid var(--line-soft); background: var(--surface-2); cursor: pointer; color: var(--ink); transition: .15s; }
.iconbtn:hover { border-color: var(--line); transform: translateY(-1px); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5em; cursor: pointer;
  font-family: var(--font-sans); font-weight: 600; font-size: .9rem; text-decoration: none;
  padding: .6rem 1.1rem; border-radius: var(--radius-pill); border: 1px solid transparent; transition: .15s; white-space: nowrap; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-ink); transform: translateY(-1px); }
.btn--ghost { background: var(--surface-2); border-color: var(--line); color: var(--ink); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--block { width: 100%; }
.btn--lg { padding: .85rem 1.5rem; font-size: 1rem; }

.navtoggle { display: none; }

/* ---- Badges & pills ---- */
.badge { display: inline-flex; align-items: center; gap: .4em; font-family: var(--font-sans); font-weight: 600;
  font-size: .72rem; letter-spacing: .02em; padding: .28em .7em; border-radius: var(--radius-pill); }
.badge--free { background: var(--green-wash); color: var(--green); }
.badge--member { background: var(--accent-wash); color: var(--accent-ink); }
.badge--verified { background: transparent; color: var(--green); border: 1px solid color-mix(in srgb, var(--green) 40%, transparent); }
.badge--cat { background: var(--dark-panel); color: var(--dark-panel-ink); }
.badge--num { color: var(--faint); font-family: var(--font-mono); font-size: .74rem; }
.tag { font-family: var(--font-sans); font-size: .78rem; color: var(--accent-ink); }

/* ---- Cards ---- */
.grid { display: grid; gap: clamp(18px, 2.5vw, 28px); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; text-decoration: none; color: inherit;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s; box-shadow: var(--shadow); }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--line); }
.card__cover { position: relative; aspect-ratio: 16/10; display: grid; place-items: center; overflow: hidden; }
.card__cover .ghost { font-family: var(--font-sans); font-weight: 700; font-size: clamp(2rem, 6vw, 3.4rem);
  letter-spacing: .04em; color: rgba(255,255,255,.09); text-transform: uppercase; user-select: none; }
.card__cover .kicker { position: absolute; left: 18px; top: 16px; font-family: var(--font-mono); font-size: .8rem;
  color: rgba(255,255,255,.82); z-index: 2; }
.card__coverimg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.card__cover:has(.card__coverimg)::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.35), transparent 40%); z-index: 1; }
.card__badges { position: absolute; right: 14px; top: 14px; display: flex; gap: .4rem; z-index: 2; }
.card__body { padding: 1.1rem 1.2rem 1.3rem; display: flex; flex-direction: column; gap: .55rem; flex: 1; }
.card__meta { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; font-size: .76rem; color: var(--faint); font-family: var(--font-sans); }
.card__title { font-family: var(--font-sans); font-weight: 600; font-size: 1.12rem; line-height: 1.2; letter-spacing: -0.01em; }
.card:hover .card__title { color: var(--accent); }
.card__dek { font-size: .92rem; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card__foot { margin-top: auto; padding-top: .4rem; font-size: .76rem; color: var(--faint); font-family: var(--font-sans); }

/* Cover gradients by category */
.cov-launch   { background: radial-gradient(120% 120% at 80% 10%, #3a2a20, #171012); }
.cov-tools    { background: radial-gradient(120% 120% at 20% 10%, #1d2b33, #10161c); }
.cov-research { background: radial-gradient(120% 120% at 70% 80%, #2a1f38, #120f1c); }
.cov-deepdive { background: radial-gradient(120% 120% at 30% 20%, #123028, #0b1713); }
.cov-business { background: radial-gradient(120% 120% at 60% 30%, #33291a, #17110a); }

/* ---- Hero / today's pick ---- */
.hero { padding-top: clamp(28px, 5vw, 56px); }
.hero__display { font-size: clamp(2.6rem, 8vw, 5rem); }
.hero__display .accent { color: var(--accent); }
.hero__sub { margin-top: 1rem; color: var(--muted); font-family: var(--font-sans); font-size: .95rem; }

.pick { position: relative; display: block; text-decoration: none; color: var(--dark-panel-ink);
  background: var(--dark-panel); border-radius: var(--radius); overflow: hidden; padding: clamp(1.6rem, 4vw, 2.6rem);
  box-shadow: var(--shadow-lg); transition: transform .2s; }
.pick:hover { transform: translateY(-3px); }
.pick .ghost { position: absolute; right: -.1em; bottom: -.15em; font-family: var(--font-sans); font-weight: 700;
  font-size: clamp(4rem, 16vw, 12rem); color: rgba(255,255,255,.05); letter-spacing: .02em; pointer-events: none; }
.pick__meta { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; position: relative; }
.pick__title { position: relative; font-size: clamp(1.7rem, 4.4vw, 3rem); margin-top: 1rem; max-width: 18ch; }
.pick__dek { position: relative; margin-top: 1rem; color: rgba(244,239,230,.72); max-width: 60ch; font-size: 1.02rem; }
.pick__foot { position: relative; margin-top: 1.4rem; font-family: var(--font-mono); font-size: .82rem; color: rgba(244,239,230,.55); }

/* ---- Section head ---- */
.sec-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 1.4rem; gap: 1rem; }
.sec-head h2 { font-size: clamp(1.1rem, 2vw, 1.35rem); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.sec-head a { text-decoration: none; color: var(--accent); font-family: var(--font-sans); font-weight: 600; font-size: .9rem; }

/* ---- Filters ---- */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.chip { font-family: var(--font-sans); font-weight: 500; font-size: .88rem; padding: .5rem .95rem; border-radius: var(--radius-pill);
  border: 1px solid var(--line); background: var(--surface); color: var(--muted); cursor: pointer; transition: .15s; }
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip--dark.active { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.filter-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; }
.searchbox { display: flex; align-items: center; gap: .5rem; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-pill); padding: .5rem .9rem; min-width: 240px; flex: 1; max-width: 360px; }
.searchbox input { border: 0; background: transparent; outline: none; width: 100%; font-size: .92rem; }
.searchbox svg { flex: none; color: var(--faint); }
.count { font-family: var(--font-sans); font-size: .85rem; color: var(--faint); }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--line-soft); margin-top: 3rem; background: var(--bg-2); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; padding-block: clamp(36px, 5vw, 56px); }
.footer-grid h4 { font-family: var(--font-sans); font-size: .74rem; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin-bottom: .9rem; }
.footer-grid a { display: block; text-decoration: none; color: var(--muted); font-size: .92rem; padding: .22rem 0; }
.footer-grid a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--line-soft); padding-block: 1.2rem; display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: .6rem; font-size: .82rem; color: var(--faint); }

/* =========================================================================
   Article page
   ========================================================================= */
.article { max-width: 760px; margin-inline: auto; }
.breadcrumb { display: flex; align-items: center; gap: .5rem; font-family: var(--font-sans); font-size: .82rem; color: var(--faint); flex-wrap: wrap; }
.breadcrumb a { text-decoration: none; color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }

.article__source { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; margin-top: 1.4rem;
  padding: .8rem 1rem; background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius-sm); }
.article__source .src-label { font-family: var(--font-sans); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); }
.article__source .src-name { font-family: var(--font-sans); font-weight: 600; }
.article__source .spacer { margin-left: auto; }

.article__actions { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; align-items: center; }
.actbtn { display: inline-flex; align-items: center; gap: .45em; font-family: var(--font-sans); font-weight: 500; font-size: .85rem;
  padding: .5rem .85rem; border-radius: var(--radius-pill); border: 1px solid var(--line); background: var(--surface); cursor: pointer; color: var(--ink); transition: .15s; }
.actbtn:hover { border-color: var(--accent); color: var(--accent); }
.actbtn.is-on { background: var(--accent-wash); border-color: var(--accent); color: var(--accent-ink); }

.formats { display: flex; width: fit-content; gap: 3px; background: var(--surface-2); border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill); padding: 4px; margin: 2rem auto 1.2rem; }
.formats button { border: 0; background: transparent; color: var(--muted); cursor: pointer; font-family: var(--font-sans);
  font-weight: 600; font-size: .88rem; padding: .5rem 1rem; border-radius: var(--radius-pill); transition: .15s; }
.formats button.active { background: var(--ink); color: var(--bg); }

.article h1.article__title { font-size: clamp(1.9rem, 4.5vw, 2.9rem); margin-top: 1.4rem; }
.article .dek { font-size: 1.18rem; color: var(--muted); margin-top: 1rem; line-height: 1.5; }

/* Podcast player card */
.podcast { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 1rem 1.1rem; margin: 1.6rem 0 .4rem; box-shadow: var(--shadow); }
.podcast__head { display: flex; align-items: center; gap: .8rem; margin-bottom: .7rem; }
.podcast__ic { width: 42px; height: 42px; flex: none; display: grid; place-items: center; font-size: 1.25rem;
  background: var(--accent-wash); border-radius: 50%; }
.podcast__text { display: flex; flex-direction: column; line-height: 1.25; }
.podcast__text b { font-family: var(--font-sans); font-weight: 600; font-size: .98rem; }
.podcast__text span { font-family: var(--font-sans); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.podcast__audio { width: 100%; height: 40px; }
/* two-tier tracks (free quick listen + member full deep-dive) */
.pod-track { padding-top: .7rem; }
.pod-track + .pod-track { margin-top: .3rem; border-top: 1px dashed var(--line-soft); }
.pod-track__label { display: flex; align-items: center; gap: .5rem; font-family: var(--font-sans);
  font-weight: 600; font-size: .82rem; color: var(--muted); margin-bottom: .35rem; }
.pod-track--locked { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.pod-track--locked .btn { white-space: nowrap; }

/* podcast page episode list */
.pod-list { display: flex; flex-direction: column; gap: 1.1rem; }
.pod-ep { display: grid; grid-template-columns: 140px minmax(0,1fr); gap: 1.1rem; background: var(--surface);
  border: 1px solid var(--line-soft); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.pod-ep__cover { position: relative; display: grid; place-items: center; overflow: hidden; text-decoration: none; min-height: 120px; }
.pod-ep__cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.pod-ep__cover .ghost { font-family: var(--font-sans); font-weight: 700; font-size: 1rem; color: rgba(255,255,255,.16); text-transform: uppercase; }
.pod-ep__body { padding: 1rem 1.2rem 1.2rem; min-width: 0; }
.pod-ep__title { display: block; text-decoration: none; color: inherit; font-family: var(--font-sans);
  font-weight: 600; font-size: 1.1rem; line-height: 1.25; margin-top: .3rem; }
.pod-ep__title:hover { color: var(--accent); }
@media (max-width: 640px) { .pod-ep { grid-template-columns: 1fr; } .pod-ep__cover { aspect-ratio: 16/9; min-height: 0; } }

.prose { font-size: 1.08rem; line-height: 1.75; }
.prose > * + * { margin-top: 1.15rem; }
.prose h2 { font-size: 1.5rem; margin-top: 2.4rem; scroll-margin-top: 90px; }
.prose h3 { font-size: 1.2rem; margin-top: 1.8rem; }
.prose h2 .kicker { display: block; font-size: .74rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); font-weight: 600; margin-bottom: .3rem; }
.prose a { color: var(--accent-ink); text-underline-offset: 3px; }
.prose strong { font-weight: 700; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li + li { margin-top: .4rem; }

.callout { border-radius: var(--radius-sm); padding: 1.1rem 1.2rem; display: flex; gap: .8rem; align-items: flex-start; font-size: .98rem; }
.callout .ic { font-size: 1.3rem; line-height: 1; flex: none; }
.callout--note { background: var(--accent-wash); color: var(--accent-ink); }
.callout--zap { background: var(--bg-2); border: 1px solid var(--line); }
.callout--warn { background: color-mix(in srgb, var(--accent) 12%, var(--surface)); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }

.stat-tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; }
.stat-tile { background: var(--dark-panel); color: var(--dark-panel-ink); border-radius: var(--radius-sm); padding: 1.2rem 1rem; text-align: center; }
.stat-tile b { display: block; font-family: var(--font-sans); font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 700; color: var(--accent); }
.stat-tile span { display: block; font-size: .82rem; color: rgba(244,239,230,.66); margin-top: .4rem; }

.deftable { width: 100%; border-collapse: collapse; font-size: .96rem; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.deftable th, .deftable td { text-align: left; padding: .8rem 1rem; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.deftable tr:last-child th, .deftable tr:last-child td { border-bottom: 0; }
.deftable th { width: 30%; font-family: var(--font-sans); font-weight: 600; color: var(--muted); background: var(--surface); }
.deftable td { color: var(--ink); }

blockquote.pull { border-left: 3px solid var(--accent); padding-left: 1.1rem; font-size: 1.25rem; font-family: var(--font-sans);
  font-weight: 500; color: var(--ink); line-height: 1.4; }

.figure { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius-sm); overflow: hidden; }
.figure .frame { aspect-ratio: 16/9; display: grid; place-items: center; }
.figure__img { width: 100%; height: auto; display: block; background: var(--bg-2); }
.figure figcaption { padding: .7rem 1rem; font-size: .84rem; color: var(--muted); border-top: 1px solid var(--line-soft); }
.figure__credit a { color: var(--accent-ink); }

.divider { border: 0; border-top: 1px solid var(--line); margin-block: 2rem; }

/* Sources + article-end footer */
.artend { margin-top: 2.4rem; }
.sources { background: var(--bg-2); border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  padding: 1rem 1.1rem; font-size: .92rem; color: var(--muted); line-height: 1.7; }
.sources__label { font-family: var(--font-sans); font-weight: 600; color: var(--ink); margin-right: .5rem; }
.sources a { color: var(--accent-ink); text-underline-offset: 3px; }
.sources .sep { margin: 0 .5rem; color: var(--faint); }
.artend__rule { text-align: center; font-family: var(--font-sans); font-size: .78rem; letter-spacing: .1em;
  color: var(--faint); margin: 2rem 0 1.2rem; position: relative; }
.artend__rule::before, .artend__rule::after { content: ""; position: absolute; top: 50%; width: 22%;
  border-top: 1px solid var(--line); }
.artend__rule::before { left: 0; } .artend__rule::after { right: 0; }
.artend__actions { display: flex; gap: .6rem; justify-content: center; flex-wrap: wrap; }
.artend__actions .is-on { background: var(--accent-wash); border-color: var(--accent); color: var(--accent-ink); }

/* Reading progress */
.progress { position: fixed; top: 0; left: 0; height: 3px; background: var(--accent); width: 0; z-index: 60; transition: width .1s linear; }

/* TOC */
.toc { position: sticky; top: 90px; font-family: var(--font-sans); font-size: .86rem; }
.toc h4 { font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin-bottom: .8rem; }
.toc a { display: block; text-decoration: none; color: var(--muted); padding: .3rem 0 .3rem .8rem; border-left: 2px solid var(--line); transition: .15s; }
.toc a:hover, .toc a.active { color: var(--accent); border-color: var(--accent); }
.article-layout { display: grid; grid-template-columns: 200px minmax(0,1fr); gap: 3rem; align-items: start; max-width: 1000px; margin-inline: auto; }

/* Paywall */
.paywall { position: relative; margin-top: -140px; padding-top: 140px;
  background: linear-gradient(to bottom, transparent, var(--bg) 120px); }
.paywall__card { text-align: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.6rem, 4vw, 2.6rem); box-shadow: var(--shadow-lg); }
.paywall__card h3 { font-size: 1.5rem; }
.paywall__meter { height: 8px; background: var(--line-soft); border-radius: 999px; overflow: hidden; margin: 1.2rem auto; max-width: 320px; }
.paywall__meter i { display: block; height: 100%; width: 25%; background: var(--accent); }

/* One-pager */
.onepager { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1.4rem, 3vw, 2.2rem); }
.onepager h3 { font-family: var(--font-sans); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: .6rem; }
.onepager ul { list-style: none; padding: 0; }
.onepager li { padding: .7rem 0; border-bottom: 1px dashed var(--line-soft); display: flex; gap: .8rem; }
.onepager li::before { content: "→"; color: var(--accent); font-weight: 700; }

/* Comic */
.comic { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.1rem; }
.comic__panel { border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--line); background: var(--dark-panel); color: var(--dark-panel-ink); aspect-ratio: 4/3; display: flex; flex-direction: column; position: relative; }
.comic__panel .num { font-family: var(--font-mono); font-size: .78rem; color: var(--accent); padding: .8rem 1rem 0; }
.comic__panel .art { flex: 1; display: grid; place-items: center; font-size: 3rem; }
.comic__panel .cap { padding: .9rem 1rem; font-size: .92rem; background: rgba(0,0,0,.25); }
/* image (manga) panels */
.comic__panel--img { aspect-ratio: auto; background: #fff; color: #17130f; border: 3px solid #17130f; border-radius: 6px; }
.comic__panel--img .num { position: absolute; top: 0; right: 0; background: #17130f; color: #fff; padding: .3rem .6rem;
  border-bottom-left-radius: 6px; z-index: 2; }
.comic__img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; border-bottom: 3px solid #17130f; }
.comic__panel--img .cap { background: #fff; color: #17130f; font-family: var(--font-sans); font-weight: 600; padding: .8rem 1rem; }

/* =========================================================================
   Membership / pricing
   ========================================================================= */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; align-items: stretch; }
.price-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; display: flex; flex-direction: column; gap: 1rem; }
.price-card.featured { border-color: var(--accent); background: var(--surface-2); box-shadow: var(--shadow-lg); position: relative; }
.price-card.featured::before { content: attr(data-flag); position: absolute; top: -12px; left: 1.6rem; background: var(--accent); color: #fff;
  font-family: var(--font-sans); font-weight: 600; font-size: .72rem; letter-spacing: .08em; padding: .25rem .7rem; border-radius: var(--radius-pill); }
.price-card .plan { font-family: var(--font-sans); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.price-card .amount { font-family: var(--font-sans); font-weight: 700; font-size: 2.6rem; line-height: 1; }
.price-card .amount s { font-size: 1.1rem; color: var(--faint); font-weight: 400; margin-left: .4rem; }
.price-card .per { font-size: .9rem; color: var(--faint); }
.price-card .note { font-size: .84rem; color: var(--muted); }
.price-card ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .5rem; font-size: .92rem; }
.price-card ul li::before { content: "✓ "; color: var(--green); font-weight: 700; }

.compare { width: 100%; border-collapse: collapse; font-size: .95rem; }
.compare th, .compare td { padding: .9rem 1rem; text-align: left; border-bottom: 1px solid var(--line-soft); }
.compare thead th { font-family: var(--font-sans); font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.compare td.yes { color: var(--green); font-weight: 600; }
.compare tbody tr:hover { background: var(--surface); }

.faq details { border-bottom: 1px solid var(--line-soft); }
.faq summary { cursor: pointer; padding: 1rem 0; font-family: var(--font-sans); font-weight: 600; font-size: 1.02rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; color: var(--accent); }
.faq details[open] summary::after { content: "－"; }
.faq details p { padding-bottom: 1.1rem; color: var(--muted); }

.seats { display: inline-flex; align-items: center; gap: .8rem; background: var(--dark-panel); color: var(--dark-panel-ink);
  border-radius: var(--radius-pill); padding: .6rem 1.1rem; font-family: var(--font-sans); font-size: .9rem; }
.seats .bar { width: 140px; height: 8px; border-radius: 999px; background: rgba(255,255,255,.15); overflow: hidden; }
.seats .bar i { display: block; height: 100%; background: var(--accent); }

/* channels */
.channels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.channel { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 1.6rem; }
.channel .ic { font-size: 1.8rem; }
.channel h3 { font-family: var(--font-sans); margin: .6rem 0; font-size: 1.15rem; }
.channel p { font-size: .92rem; color: var(--muted); margin-bottom: 1rem; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.2rem; counter-reset: s; }
.step { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 1.6rem; }
.step .n { font-family: var(--font-sans); font-weight: 700; font-size: 1.4rem; color: var(--accent); }
.step h3 { font-family: var(--font-sans); margin: .5rem 0; }
.step p { color: var(--muted); font-size: .94rem; }

/* podcast list */
.ep { display: flex; align-items: center; gap: 1rem; padding: 1rem; border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  background: var(--surface); text-decoration: none; color: inherit; transition: .15s; }
.ep:hover { border-color: var(--accent); }
.ep .play { width: 44px; height: 44px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; flex: none; }
.ep .meta { flex: 1; }
.ep .meta b { font-family: var(--font-sans); }
.ep .meta span { display: block; font-size: .82rem; color: var(--faint); }
.ep .dur { font-family: var(--font-mono); font-size: .82rem; color: var(--faint); }

/* toast */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px); opacity: 0;
  background: var(--ink); color: var(--bg); font-family: var(--font-sans); font-size: .9rem; padding: .7rem 1.2rem;
  border-radius: var(--radius-pill); box-shadow: var(--shadow-lg); z-index: 100; transition: .25s; pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* generic prose blocks for about */
.prose-narrow { max-width: 680px; margin-inline: auto; }

/* modal (auth / account) */
.modal-backdrop { position: fixed; inset: 0; z-index: 200; background: color-mix(in srgb, var(--ink) 45%, transparent);
  backdrop-filter: blur(4px); display: grid; place-items: center; padding: 1rem; animation: fade .15s ease; }
@keyframes fade { from { opacity: 0; } }
.modal { position: relative; width: 100%; max-width: 400px; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(1.4rem, 4vw, 2rem); box-shadow: var(--shadow-lg); }
.modal h3 { font-family: var(--font-sans); font-size: 1.4rem; }
.modal__sub { color: var(--muted); font-size: .92rem; margin: .4rem 0 1.2rem; }
.modal__x { position: absolute; top: .9rem; right: 1rem; border: 0; background: transparent; color: var(--faint);
  font-size: 1rem; cursor: pointer; }
.modal__x:hover { color: var(--ink); }
.modal__switch { margin-top: 1rem; font-size: .9rem; color: var(--muted); text-align: center; }
.modal__switch a { color: var(--accent); }
.field { width: 100%; padding: .75rem 1rem; border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface-2); font-size: .95rem; }
.field:focus { outline: none; border-color: var(--accent); }

/* =========================================================================
   Timeline page — single left-rail chronology of explainers
   ========================================================================= */
.timeline { position: relative; margin-top: 2.4rem; padding-left: 2.2rem; }
/* the spine */
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px;
  width: 2px; background: var(--line); border-radius: 2px; }

.tl-group { position: relative; }
.tl-group + .tl-group { margin-top: 2.4rem; }

/* date header sits on the rail as a larger accent node */
.tl-date { position: relative; display: flex; align-items: baseline; gap: .7rem; margin-bottom: 1.1rem; }
.tl-date::before { content: ""; position: absolute; left: calc(-2.2rem + 1px); top: .35em;
  width: 12px; height: 12px; border-radius: 3px; background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg); transform: rotate(45deg); }
.tl-date__day { font-family: var(--font-mono); font-weight: 600; font-size: 1rem; color: var(--ink); letter-spacing: .01em; }
.tl-date__count { font-family: var(--font-sans); font-size: .78rem; color: var(--faint); }

.tl-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .9rem; }
.tl-item { position: relative; }
/* dot on the rail for each entry */
.tl-item::before { content: ""; position: absolute; left: calc(-2.2rem + 1px); top: 1.35rem;
  width: 11px; height: 11px; border-radius: 50%; background: var(--surface);
  border: 2px solid var(--accent); box-shadow: 0 0 0 3px var(--bg); z-index: 1; }

.tl-card { display: flex; gap: 1.1rem; align-items: stretch; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  padding: 1rem 1.2rem; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s; }
.tl-card:hover { transform: translateX(2px); box-shadow: var(--shadow-lg); border-color: var(--line); }
.tl-card__main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: .5rem; }
.tl-card__meta { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap;
  font-size: .76rem; color: var(--faint); font-family: var(--font-sans); }
.tl-card__title { font-family: var(--font-sans); font-weight: 600; font-size: 1.08rem; line-height: 1.25; letter-spacing: -0.01em; }
.tl-card:hover .tl-card__title { color: var(--accent); }
.tl-card__dek { font-size: .92rem; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tl-card__foot { margin-top: auto; padding-top: .1rem; font-size: .76rem; color: var(--faint);
  font-family: var(--font-sans); display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
.tl-card__tag { color: var(--accent-ink); }
.tl-card__num { font-family: var(--font-mono); }
/* optional cover thumbnail */
.tl-card__thumb { flex: none; width: 96px; align-self: stretch; border-radius: var(--radius-sm);
  overflow: hidden; background: var(--dark-panel); }
.tl-card__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.tl-earlier { display: flex; justify-content: center; margin-top: 2rem; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .pricing, .channels, .steps, .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
}
@media (max-width: 680px) {
  .nav__links { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column;
    background: var(--bg); border-bottom: 1px solid var(--line); padding: 1rem; gap: .3rem; }
  .nav__links.open { display: flex; }
  .nav__links a { padding: .8rem 1rem; }
  .navtoggle { display: grid; }
  .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .pricing, .channels, .steps, .footer-grid, .stat-tiles, .comic { grid-template-columns: 1fr; }
  .brand__name span { display: none; }
  .compare { font-size: .82rem; }
  .compare th, .compare td { padding: .6rem .5rem; }
  .nav__tools .btn--subscribe { display: none; }
  .timeline { padding-left: 1.6rem; }
  .tl-date::before, .tl-item::before { left: calc(-1.6rem + 1px); }
  .tl-card__thumb { display: none; }
}