/* app.css — HN reader. Editorial paper-and-ink with one hot accent. */

/* ---------- Fonts ---------- */
@font-face {
  font-family: 'Figtree';
  font-style: normal;
  font-weight: 300 900;
  font-display: swap;
  src: url('../fonts/Figtree-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Figtree';
  font-style: italic;
  font-weight: 300 900;
  font-display: swap;
  src: url('../fonts/Figtree-italic.woff2') format('woff2');
}

/* ---------- Tokens ---------- */
:root {
  --sans: 'Figtree', -apple-system, 'Segoe UI', 'Helvetica Neue', sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --paper: #f6f1e8;
  --paper-2: #fbf8f2;
  --paper-3: #ede6da;
  --ink: #1c1917;
  --ink-2: #57524b;
  --ink-3: #8d857a;
  --line: rgba(28, 25, 23, 0.11);
  --line-strong: rgba(28, 25, 23, 0.22);
  --accent: #ff6600;
  --accent-ink: #c24d00;
  --accent-soft: rgba(255, 102, 0, 0.11);
  --shadow: 0 10px 30px rgba(28, 25, 23, 0.14), 0 2px 6px rgba(28, 25, 23, 0.08);
  --code-bg: #efe9df;
  --sel: rgba(255, 102, 0, 0.09);
  --grain: 0.06;

  --reader-scale: 1;
  --sidebar: 400px;
  --head-h: 54px;
  --tabbar-h: 50px;
  --sat: env(safe-area-inset-top, 0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left, 0px);
  --sar: env(safe-area-inset-right, 0px);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #131110;
    --paper-2: #1b1816;
    --paper-3: #232019;
    --ink: #ebe4d8;
    --ink-2: #b4aa9b;
    --ink-3: #7f766b;
    --line: rgba(235, 228, 216, 0.10);
    --line-strong: rgba(235, 228, 216, 0.22);
    --accent: #ff7a1f;
    --accent-ink: #ff8f45;
    --accent-soft: rgba(255, 122, 31, 0.14);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 2px 6px rgba(0, 0, 0, 0.35);
    --code-bg: #221e1a;
    --sel: rgba(255, 122, 31, 0.12);
    --grain: 0.05;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #131110;
  --paper-2: #1b1816;
  --paper-3: #232019;
  --ink: #ebe4d8;
  --ink-2: #b4aa9b;
  --ink-3: #7f766b;
  --line: rgba(235, 228, 216, 0.10);
  --line-strong: rgba(235, 228, 216, 0.22);
  --accent: #ff7a1f;
  --accent-ink: #ff8f45;
  --accent-soft: rgba(255, 122, 31, 0.14);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 2px 6px rgba(0, 0, 0, 0.35);
  --code-bg: #221e1a;
  --sel: rgba(255, 122, 31, 0.12);
  --grain: 0.05;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { height: 100%; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}
/* paper grain */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: var(--grain);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}
:root[data-theme="dark"] body::before { mix-blend-mode: screen; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) body::before { mix-blend-mode: screen; } }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
button:disabled { cursor: default; opacity: 0.5; }
img { max-width: 100%; }
svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--accent-soft); }
kbd {
  font-family: var(--mono); font-size: 0.72em; padding: 1px 5px; border: 1px solid var(--line-strong);
  border-bottom-width: 2px; border-radius: 4px; margin: 0 1px; color: var(--ink-2);
}
.muted { color: var(--ink-3); }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.nojs { max-width: 60ch; margin: 24px auto; padding: 0 20px; font-size: 16px; line-height: 1.5; }
.nojs a { color: var(--accent-ink); text-decoration: underline; }
.story-meta, .story-rank, .kicker, .article-meta, .thread-meta, .c-head, .tab, .tabbar-btn span,
.seg-btn, .chip, .btn, .feed-status, .feed-offline, .toast, .thread-tools, .thread-end, .thread-count,
.story-domain, .feed-empty .hint, .detail-empty .hint, .tldr summary, .article-notice, .thread-notice {
  font-family: var(--sans);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.005em;
}

/* scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent; }
*::-webkit-scrollbar { width: 6px; height: 6px; }
*::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

/* ---------- Shell ---------- */
.app {
  position: relative;
  z-index: 1;
  height: 100%;
  display: grid;
  grid-template-rows: minmax(0, 1fr);
  grid-template-columns: minmax(0, 1fr);
}

/* ---------- Feed pane ---------- */
.feed {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--paper);
}
.feed-head {
  display: flex;
  align-items: center;
  gap: 8px;
  height: calc(var(--head-h) + var(--sat));
  padding: var(--sat) 8px 0 14px;
  padding-left: calc(14px + var(--sal));
  border-bottom: 1px solid var(--line);
  flex: none;
}
.brand { display: flex; align-items: baseline; gap: 7px; flex: 1; min-width: 0; }
.brand-mark { width: 24px; height: 24px; border-radius: 6px; align-self: center; }
.brand-word { font-family: var(--sans); font-weight: 800; font-size: 21px; letter-spacing: -0.02em; line-height: 1; }
.brand-tag { font-family: var(--sans); font-size: 11px; font-weight: 600; color: var(--ink-3); letter-spacing: 0.08em; text-transform: uppercase; }
.head-actions { display: flex; gap: 2px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 10px; color: var(--ink-2);
  transition: background 0.15s, color 0.15s, transform 0.15s;
  font-family: var(--sans); font-size: 13px; font-weight: 700;
}
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn.small { width: 32px; height: 32px; }
.icon-btn.small svg { width: 17px; height: 17px; }
.icon-btn sup { font-size: 0.6em; margin-left: 1px; }
@media (hover: hover) { .icon-btn:hover { background: var(--paper-3); color: var(--ink); } }
.icon-btn:active { transform: scale(0.92); }
.icon-btn.on { color: var(--accent-ink); }
.icon-btn.on svg { fill: var(--accent); stroke: var(--accent); }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}
#btn-refresh.spinning svg { animation: spin 0.6s linear; }
@keyframes spin { to { transform: rotate(360deg); } }

/* feed tabs (desktop) */
.feed-tabs {
  display: none;
  gap: 2px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  flex: none;
}
.tab {
  font-size: 12px; font-weight: 500; letter-spacing: 0.02em;
  padding: 6px 10px; border-radius: 999px; color: var(--ink-2);
  white-space: nowrap; transition: background 0.15s, color 0.15s;
}
.tab:hover { background: var(--paper-3); color: var(--ink); }
.tab.active { background: var(--ink); color: var(--paper); }
.tab[data-feed="saved"] { margin-left: auto; }

/* search */
.feed-search {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px 8px 14px; border-bottom: 1px solid var(--line); flex: none;
  background: var(--paper-2);
}
.feed-search svg { width: 18px; height: 18px; color: var(--ink-3); flex: none; }
.feed-search input {
  flex: 1; min-width: 0; font: 500 16px var(--sans); /* 16px: stops iOS zooming in on focus */ color: var(--ink);
  background: transparent; border: 0; outline: 0; padding: 6px 0;
}
.feed-search input::placeholder { color: var(--ink-3); }
.feed-search input::-webkit-search-cancel-button { display: none; }

/* scroll area */
.feed-scroll {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  -webkit-overflow-scrolling: touch;
  padding-bottom: calc(var(--tabbar-h) + var(--sab));
}
.feed-status {
  padding: 10px 14px 4px; font-size: 12px; color: var(--ink-3);
}
.feed-status b { color: var(--ink); font-weight: 600; }
.feed-offline {
  margin: 10px 14px 0; padding: 8px 12px; font-size: 12px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-ink);
}
.stories { list-style: none; margin: 0; padding: 0; transition: transform 0.3s var(--ease); }
.feed-foot { padding: 14px; transition: transform 0.3s var(--ease); }
.feed-empty { padding: 48px 20px; text-align: center; color: var(--ink-2); font-size: 16px; }
.feed-empty .hint { font-size: 12px; color: var(--ink-3); margin-top: 6px; }

/* story row */
.story {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 0 10px;
  padding: 12px 12px 12px 10px;
  padding-left: calc(10px + var(--sal));
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.12s;
}
.story:active { background: var(--paper-3); }
@media (hover: hover) { .story:hover { background: var(--paper-2); } }
.story.selected { background: var(--sel); box-shadow: inset 3px 0 0 var(--accent); }
.story-rank {
  font-size: 11px; color: var(--ink-3); text-align: right; padding-top: 5px;
  font-variant-numeric: tabular-nums;
}
.story-main { min-width: 0; }
.story-title { margin: 0; font-size: 16px; font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
.story-link { color: var(--ink); }
.story-link:hover { color: var(--accent-ink); }
.is-read .story-link { color: var(--ink-3); font-weight: 500; }
.story-domain {
  font-size: 11.5px; color: var(--ink-3); margin-left: 6px; letter-spacing: 0.01em;
  font-weight: 400; white-space: nowrap;
}
.story-domain:hover { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 2px; }
.story-blurb {
  margin: 4px 0 0; font-size: 13px; line-height: 1.4; color: var(--ink-2);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.is-read .story-blurb { color: var(--ink-3); }
.story-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-top: 6px; font-size: 12px; color: var(--ink-3); font-variant-numeric: tabular-nums;
}
.story-pts { display: inline-flex; align-items: center; gap: 3px; color: var(--ink-2); font-weight: 500; }
.story-pts svg { width: 10px; height: 10px; fill: var(--accent); stroke: none; }
.story-comments {
  display: inline-flex; align-items: center; gap: 4px; padding: 2px 6px; margin: -2px -6px;
  border-radius: 6px; color: var(--ink-2); font-weight: 500;
}
.story-comments svg { width: 12px; height: 12px; stroke-width: 2; }
.story-comments:hover { background: var(--accent-soft); color: var(--accent-ink); }
.story-job { color: var(--accent-ink); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; font-size: 10px; }
.story-thumb {
  width: 60px; height: 60px; border-radius: 10px; overflow: hidden; align-self: center;
  background: var(--paper-3); display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); flex: none;
}
.thumb-ico { width: 24px; height: 24px; opacity: 0.85; border-radius: 4px; }
.thumb-glyph { font-family: var(--sans); font-size: 24px; color: var(--ink-3); }
.thumb-img { width: 100%; height: 100%; object-fit: cover; animation: fade 0.35s ease; }
.is-read .story-thumb { opacity: 0.7; }
@keyframes fade { from { opacity: 0; } }

/* entrance */
.story-in { animation: rise 0.42s var(--ease) both; animation-delay: calc(var(--i, 0) * 28ms); }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }
@media (prefers-reduced-motion: reduce) { .story-in { animation: none; } }

/* skeleton */
.skel { background: var(--paper-3); border-radius: 4px; animation: pulse 1.4s ease-in-out infinite; }
.skel-line { height: 13px; margin: 6px 0; }
.skel-line.thin { height: 9px; }
.skel-gap { height: 14px; }
.skel-block { padding: 8px 0; }
.story-skel .story-rank { width: 16px; height: 10px; margin-top: 6px; }
@keyframes pulse { 0%, 100% { opacity: 0.55; } 50% { opacity: 1; } }

/* pull to refresh */
.ptr {
  position: absolute; left: 0; right: 0; top: 0; height: 0; z-index: 3;
  display: flex; justify-content: center; pointer-events: none;
  --pull: 0px; --p: 0;
}
.ptr-glow {
  position: absolute; top: calc(var(--pull) - 70px); width: 160px; height: 80px; border-radius: 50%;
  background: radial-gradient(ellipse at center, color-mix(in srgb, var(--accent) 38%, transparent), transparent 68%);
  filter: blur(12px); opacity: calc(var(--p) * 0.9);
}
.ptr-disc {
  position: absolute; top: calc(var(--pull) - 48px);
  width: 40px; height: 40px; border-radius: 50%; background: var(--paper-2);
  box-shadow: var(--shadow), inset 0 0 0 1px var(--line);
  display: grid; place-items: center;
  opacity: min(1, calc(var(--p) * 1.8));
  transform: scale(calc(0.72 + var(--p) * 0.28));
}
.ptr-ring, .ptr-mark { grid-area: 1 / 1; }
.ptr-ring { width: 40px; height: 40px; transform: rotate(-90deg); }
.ptr-ring circle {
  fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round;
  stroke-dasharray: 100.5; stroke-dashoffset: calc(100.5 * (1 - var(--p)));
  opacity: 0.95;
}
.ptr-track { stroke: var(--line-strong) !important; stroke-dasharray: none !important; stroke-dashoffset: 0 !important; opacity: 0.5 !important; }
.ptr-mark {
  width: 14px; height: 14px; fill: var(--accent); stroke: none;
  transform: scale(calc(0.55 + var(--p) * 0.45)) translateY(-0.5px);
  transition: filter 0.2s;
}
.ptr.armed .ptr-mark { filter: drop-shadow(0 0 5px color-mix(in srgb, var(--accent) 80%, transparent)); }
.ptr.armed .ptr-disc { transform: scale(1.04); transition: transform 0.18s var(--ease); }
.ptr.refreshing .ptr-disc, .ptr.done .ptr-disc { opacity: 1; transform: scale(1); }
.ptr.refreshing .ptr-ring { animation: ptr-spin 0.9s linear infinite; }
.ptr.refreshing .ptr-ring circle:not(.ptr-track) { stroke-dashoffset: 72; transition: stroke-dashoffset 0.25s; }
.ptr.refreshing .ptr-mark { animation: ptr-kindle 0.9s ease-in-out infinite; }
.ptr.refreshing .ptr-glow { opacity: 0.9; animation: ptr-pulse 1.2s ease-in-out infinite; }
.ptr.done .ptr-ring { transform: rotate(-90deg); }
.ptr.done .ptr-ring circle:not(.ptr-track) { stroke-dashoffset: 0; transition: stroke-dashoffset 0.3s var(--ease); }
.ptr.done .ptr-mark { transform: scale(1.15); filter: drop-shadow(0 0 7px var(--accent)); transition: transform 0.25s var(--ease), filter 0.25s; }
.ptr.done .ptr-glow { opacity: 0; transition: opacity 0.35s; }
.ptr.settle .ptr-disc { opacity: 0; transform: scale(0.6); transition: opacity 0.22s, transform 0.28s var(--ease); }
.ptr.settle .ptr-glow { opacity: 0; transition: opacity 0.22s; }
@keyframes ptr-spin { to { transform: rotate(270deg); } }
@keyframes ptr-kindle { 0%, 100% { transform: scale(0.9); opacity: 0.75; } 50% { transform: scale(1.1); opacity: 1; } }
@keyframes ptr-pulse { 0%, 100% { opacity: 0.55; } 50% { opacity: 1; } }

/* ---------- Mobile tab bar ---------- */
.tabbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 15;
  display: flex;
  height: calc(var(--tabbar-h) + var(--sab));
  padding: 0 var(--sar) var(--sab) var(--sal);
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
}
.tabbar-btn {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; padding-top: 2px; color: var(--ink-3); font-size: 10px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  transition: color 0.15s;
}
.tabbar-btn svg { width: 22px; height: 22px; stroke-width: 1.6; }
.tabbar-btn.active { color: var(--accent-ink); }
.tabbar-btn.active svg { stroke: var(--accent); }
.tabbar-btn.active[data-feed="top"] svg { fill: var(--accent); }
.tabbar-btn:active { transform: scale(0.94); }

/* ---------- Detail (mobile overlay) ---------- */
.detail {
  position: fixed;
  inset: 0;
  z-index: 20;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  transform: translateX(100%);
  visibility: hidden;
  transition: transform 0.3s var(--ease), visibility 0s linear 0.3s;
  will-change: transform;
  box-shadow: -12px 0 40px rgba(0, 0, 0, 0.18);
}
.detail.open { transform: translateX(0); visibility: visible; transition: transform 0.3s var(--ease); }
.detail.dragging { transition: none; }
.detail-head {
  display: flex; align-items: center; gap: 6px;
  height: calc(var(--head-h) + var(--sat));
  padding: var(--sat) 6px 0 calc(6px + var(--sal));
  border-bottom: 1px solid var(--line); flex: none; position: relative;
  background: var(--paper);
}
.seg {
  display: flex; flex: 1; justify-content: center; gap: 2px; padding: 3px;
  background: var(--paper-3); border-radius: 10px; max-width: 280px; margin: 0 auto;
}
.seg-btn {
  flex: 1; padding: 6px 10px; border-radius: 8px; font-size: 12px; font-weight: 500;
  color: var(--ink-2); white-space: nowrap; transition: background 0.15s, color 0.15s, box-shadow 0.15s;
}
.seg-btn.active { background: var(--paper-2); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,0.12); }
.seg-count { color: var(--ink-3); font-weight: 400; }
.seg-btn.active .seg-count { color: var(--accent-ink); }
.detail-actions { display: flex; align-items: center; gap: 0; }
.font-ctl { display: none; }
.detail[data-pane="article"] .font-ctl { display: flex; }

.detail-body { position: relative; flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); }
.col-resizer { display: none; }
#btn-swap { display: none; }
.pane { position: relative; min-height: 0; min-width: 0; overflow: hidden; display: none; }
.detail[data-pane="article"] .pane-article { display: block; }
.detail[data-pane="comments"] .pane-comments { display: block; }
.pane-scroll {
  height: 100%; overflow-y: auto; overscroll-behavior: contain; -webkit-overflow-scrolling: touch;
  padding-bottom: calc(24px + var(--sab));
}
.detail-empty { display: none; }

/* reading progress */
.read-progress {
  position: absolute; left: 0; top: 0; height: 2px; width: 100%; z-index: 2;
  background: var(--accent); transform-origin: left; transform: scaleX(0); pointer-events: none;
}

/* ---------- Article ---------- */
.article {
  max-width: 68ch;
  margin: 0 auto;
  padding: 18px 20px 40px;
  padding-left: calc(20px + var(--sal));
  padding-right: calc(20px + var(--sar));
}
.article-head { margin-bottom: 14px; }
.kicker {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3);
}
.kicker .dot { color: var(--line-strong); }
.kick-domain { color: var(--accent-ink); }
.kick-domain:hover { text-decoration: underline; text-underline-offset: 3px; }
.article-title {
  margin: 8px 0 10px; font-size: calc(26px * var(--reader-scale)); font-weight: 800;
  line-height: 1.15; letter-spacing: -0.025em; text-wrap: balance;
}
.article-meta { display: flex; flex-wrap: wrap; gap: 12px; font-size: 11.5px; color: var(--ink-3); }
.meta-comments { color: var(--ink-2); text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
.meta-comments:hover { color: var(--accent-ink); }
.article-alt-title { margin: -2px 0 14px; font-size: 14px; color: var(--ink-2); }
.article-alt-title.byline, .byline { font-style: normal; color: var(--ink-3); }

.tldr {
  margin: 4px 0 20px; padding: 12px 14px 12px 16px; border-left: 3px solid var(--accent);
  background: var(--paper-2); border-radius: 0 10px 10px 0;
}
.tldr summary {
  cursor: pointer; font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-ink);
  font-weight: 600; list-style: none; display: flex; align-items: center; gap: 8px;
}
.tldr summary::-webkit-details-marker { display: none; }
.tldr summary::after { content: '−'; margin-left: auto; color: var(--ink-3); font-weight: 400; }
.tldr:not([open]) summary::after { content: '+'; }
.tldr p { margin: 8px 0 0; font-size: calc(15px * var(--reader-scale)); line-height: 1.55; color: var(--ink-2); }

.prose {
  font-size: calc(17px * var(--reader-scale));
  line-height: 1.62;
  color: var(--ink);
  overflow-wrap: break-word;
}
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 1.15em; }
.prose h1, .prose h2, .prose h3, .prose h4 { line-height: 1.22; letter-spacing: -0.01em; margin: 1.6em 0 0.5em; font-weight: 700; }
.prose h1 { font-size: 1.45em; }
.prose h2 { font-size: 1.25em; }
.prose h3 { font-size: 1.08em; }
.prose h4 { font-size: 0.82em; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-2); }
.prose a { color: var(--accent-ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--accent-ink) 45%, transparent); }
.prose a:hover { text-decoration-color: var(--accent-ink); }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.15em; }
.prose li { margin-bottom: 0.35em; }
.prose li p { margin-bottom: 0.5em; }
.prose blockquote {
  margin: 1.2em 0; padding: 0.2em 0 0.2em 1.1em; border-left: 3px solid var(--line-strong);
  color: var(--ink-2);
}
.prose img, .prose video { display: block; max-width: 100%; height: auto; border-radius: 8px; margin: 1.2em auto; }
.prose figure { margin: 1.4em 0; }
.prose figure.hero { margin-top: 0; }
.prose figcaption { font-size: 0.75em; color: var(--ink-3); text-align: center; margin-top: -0.6em; }
.prose pre {
  font-family: var(--mono); font-size: 0.74em; line-height: 1.55; background: var(--code-bg);
  padding: 14px 16px; border-radius: 10px; overflow-x: auto; margin: 1.2em 0; tab-size: 2;
  border: 1px solid var(--line);
}
.prose code, .prose kbd, .prose tt { font-family: var(--mono); font-size: 0.82em; background: var(--code-bg); padding: 0.12em 0.4em; border-radius: 5px; }
.prose pre code { font-size: inherit; background: none; padding: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line-strong); margin: 2em auto; width: 40%; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.82em; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 0.45em 0.7em; text-align: left; vertical-align: top; }
.prose th { background: var(--paper-2); font-weight: 600; }
.prose sup { font-size: 0.65em; }
.prose-text { font-size: calc(16px * var(--reader-scale)); }

.article-notice, .thread-notice {
  margin: 18px 0; padding: 18px; border: 1px dashed var(--line-strong); border-radius: 12px;
  font-size: 13px; color: var(--ink-2); text-align: center;
}
.article-notice p, .thread-notice p { margin: 0 0 10px; }
.article-foot {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line);
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 14px; border-radius: 10px; font-size: 12.5px; font-weight: 500;
  background: var(--ink); color: var(--paper); transition: transform 0.12s, background 0.15s; white-space: nowrap;
}
.btn:hover { background: var(--accent-ink); color: #fff; }
.btn:active { transform: scale(0.97); }
.btn.ghost { background: var(--paper-3); color: var(--ink-2); }
.btn.ghost:hover { background: var(--accent-soft); color: var(--accent-ink); }
#btn-more { width: 100%; }
.chip {
  font-size: 11px; padding: 5px 10px; border-radius: 999px; background: var(--paper-3); color: var(--ink-2);
  transition: background 0.15s, color 0.15s;
}
.chip:hover { background: var(--accent-soft); color: var(--accent-ink); }

/* ---------- Thread ---------- */
.thread-head {
  padding: 16px 16px 12px; padding-left: calc(16px + var(--sal)); border-bottom: 1px solid var(--line);
}
.thread-title { display: block; font-size: 17px; font-weight: 700; line-height: 1.25; letter-spacing: -0.005em; }
.thread-title:hover { color: var(--accent-ink); }
.thread-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; font-size: 11.5px; color: var(--ink-3); }
.thread-tools { display: flex; gap: 6px; margin-top: 12px; }
.comments, .c-kids { list-style: none; margin: 0; padding: 0; }
.comments { padding: 4px 0 0; }

.c {
  --indent: 14px;
  position: relative;
  padding: 10px 14px 6px 20px;
  padding-left: calc(20px + var(--sal));
}
.c .c { padding-left: 20px; padding-right: 0; padding-bottom: 0; }
.c-kids { margin-left: calc(var(--indent) * -1 + 8px); }
.c-deep > .c-kids { margin-left: -12px; }
.c[data-depth="0"] { border-bottom: 1px solid var(--line); padding-bottom: 12px; }
.c-rail {
  position: absolute; left: 6px; top: 8px; bottom: 6px; width: 14px; cursor: pointer;
  padding: 0; border-radius: 4px;
}
.c-rail::before {
  content: ''; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px; border-radius: 1px;
  background: var(--line-strong); transition: background 0.15s, width 0.15s;
}
.c[data-depth="0"] > .c-rail::before { background: var(--accent); opacity: 0.55; }
.c[data-depth="1"] > .c-rail::before { opacity: 0.9; }
@media (hover: hover) { .c-rail:hover::before { background: var(--accent); opacity: 1; width: 3px; } }
.c[data-depth="0"] > .c-rail { left: calc(6px + var(--sal)); }
.c-head {
  display: flex; align-items: baseline; gap: 8px; font-size: 11.5px; color: var(--ink-3);
  cursor: pointer; user-select: none; -webkit-user-select: none; padding: 2px 0 4px; min-height: 22px;
}
.c-by { font-weight: 600; color: var(--ink-2); }
.c-by.is-op { color: var(--accent-ink); }
.op {
  font-size: 9px; padding: 1px 4px; margin-left: 5px; border-radius: 4px; vertical-align: 1px;
  background: var(--accent); color: #fff; letter-spacing: 0.06em;
}
.c-count { margin-left: auto; font-size: 10px; color: var(--ink-3); opacity: 0.8; }
.c-more { display: none; margin-left: auto; color: var(--accent-ink); font-weight: 500; }
.c-body { font-size: 15px; line-height: 1.5; color: var(--ink); overflow-wrap: break-word; }
@media (pointer: coarse) { .c-body { cursor: pointer; -webkit-touch-callout: none; } }
.c-body p { margin: 0 0 0.7em; }
.c-body p:last-child { margin-bottom: 0; }
.c-body a { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 2px; text-decoration-color: color-mix(in srgb, var(--accent-ink) 40%, transparent); word-break: break-word; }
.c-body pre { font-family: var(--mono); font-size: 12px; line-height: 1.5; background: var(--code-bg); border: 1px solid var(--line); padding: 10px 12px; border-radius: 8px; overflow-x: auto; margin: 0.5em 0; }
.c-body code { font-family: var(--mono); font-size: 0.85em; background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
.c-body pre code { background: none; padding: 0; }
.c-body i { color: var(--ink-2); }

.c.collapsed > .c-body, .c.collapsed > .c-kids { display: none; }
.c.collapsed > .c-head { color: var(--ink-3); }
.c.collapsed > .c-head .c-count { display: none; }
.c.collapsed > .c-head .c-more { display: inline; }
.c.collapsed > .c-rail::before { background: var(--accent); opacity: 1; }
.c.collapsed { padding-bottom: 8px; }
.c.collapsed > .c-head::after { content: ''; }

.c-skel { padding-left: calc(20px + var(--d) * 16px); }

.thread-end {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 22px 16px 30px; font-size: 11.5px; color: var(--ink-3);
}
.fab {
  position: absolute; right: 16px; bottom: calc(18px + var(--sab));
  width: 46px; height: 46px; border-radius: 50%; background: var(--ink); color: var(--paper);
  box-shadow: var(--shadow); display: flex; align-items: center; justify-content: center; z-index: 5;
  transition: transform 0.15s, opacity 0.2s;
}
.fab svg { width: 20px; height: 20px; stroke-width: 2.2; }
.fab:active { transform: scale(0.92); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + var(--sab) + 14px); z-index: 60;
  transform: translate(-50%, 16px); opacity: 0; transition: transform 0.25s var(--ease), opacity 0.2s;
  display: flex; align-items: center; gap: 14px; padding: 10px 16px; border-radius: 12px;
  background: var(--ink); color: var(--paper); font-size: 12.5px; box-shadow: var(--shadow);
  max-width: min(92vw, 420px);
}
.toast.show { transform: translate(-50%, 0); opacity: 1; }
.toast-btn { color: var(--accent); font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; font-size: 11px; }
body.detail-open .toast { bottom: calc(var(--sab) + 18px); }

/* ============================================================
   Two-pane (tablet / small desktop)
   ============================================================ */
@media (min-width: 768px) {
  .app { grid-template-columns: var(--sidebar) 7px minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); }
  .tabbar { display: none; }
  .feed-scroll { padding-bottom: 0; }
  .col-resizer[data-resize="sidebar"] { display: block; }
  .col-resizer {
    position: relative; cursor: col-resize; z-index: 5; touch-action: none;
    background: var(--paper);
  }
  .col-resizer::before {
    content: ''; position: absolute; top: 0; bottom: 0; left: 3px; width: 1px; background: var(--line);
    transition: background 0.15s, width 0.15s, left 0.15s;
  }
  .col-resizer::after {
    content: ''; position: absolute; top: 50%; left: 1px; width: 5px; height: 36px; margin-top: -18px; border-radius: 3px;
    background: var(--line-strong); opacity: 0; transition: opacity 0.15s;
  }
  .col-resizer:hover::before, .col-resizer.active::before { background: var(--accent); width: 3px; left: 2px; }
  .col-resizer:hover::after, .col-resizer.active::after { opacity: 1; }
  body.resizing { cursor: col-resize; user-select: none; -webkit-user-select: none; }
  body.resizing .pane-scroll, body.resizing .feed-scroll { pointer-events: none; }
  .feed-tabs { display: flex; }
  .feed-head { padding-left: 16px; }
  .brand-mark { width: 26px; height: 26px; }
  .story { padding: 12px 12px 12px 10px; }
  .story-title { font-size: 15px; }
  .story-thumb { width: 52px; height: 52px; border-radius: 8px; }

  .detail {
    position: relative; inset: auto; transform: none; visibility: visible; transition: none;
    box-shadow: none; z-index: auto; background: var(--paper-2);
  }
  .detail-head { background: var(--paper-2); padding-left: 10px; }
  #btn-back { display: none; }
  .detail:not([data-id]) .detail-head { visibility: hidden; }
  .detail:not([data-id]) .pane { display: none !important; }
  .detail:not([data-id]) .detail-empty {
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
    position: absolute; inset: 0; color: var(--ink-3); font-size: 17px;
  }
  .detail-empty img { opacity: 0.9; border-radius: 14px; filter: saturate(0.8); }
  .detail-empty p { margin: 0; }
  .detail-empty .hint { font-size: 11px; font-style: normal; display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
  .article { padding: 30px 40px 60px; }
  .c { padding-left: 24px; }
  .c .c { padding-left: 22px; }
  .thread-head { padding: 18px 22px 14px; }
  .c[data-depth="0"] > .c-rail { left: 8px; }
  .toast { bottom: 24px; }
  body.detail-open .toast { bottom: 24px; }
}

/* ============================================================
   Three-pane (article | comments) on wide screens
   ============================================================ */
@media (min-width: 1180px) {
  :root { --sidebar: 380px; }
  .seg { display: none; }
  .detail-head { justify-content: flex-end; }
  .detail-body { grid-template-columns: min(var(--split, 53%), calc(100% - 327px)) 7px minmax(0, 1fr); }
  .detail .pane { display: block !important; }
  .col-resizer[data-resize="split"] { display: block; background: var(--paper-2); }
  .pane-article { order: 1; } .col-resizer[data-resize="split"] { order: 2; } .pane-comments { order: 3; }
  .detail-body.swapped .pane-comments { order: 1; } .detail-body.swapped .pane-article { order: 3; }
  .pane-comments { background: var(--paper); }
  #btn-swap { display: inline-flex; }
  #btn-swap.on svg { stroke: var(--accent); }
  .detail:not([data-id]) .pane { display: none !important; }
  .font-ctl { display: flex; }
  .fab { display: none; }
  .article { padding: 30px 44px 60px; max-width: 72ch; }
}
@media (min-width: 1500px) {
  :root { --sidebar: 420px; }
}