/* Base, app shell, navigation, shared controls and motion. Sleek, light only. */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  overscroll-behavior-y: none;
  -webkit-text-size-adjust: 100%;
  scrollbar-color: var(--line-strong) transparent;
}
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 var(--font);
  font-feature-settings: "ss01" 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior-y: none;
  -webkit-tap-highlight-color: transparent;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }
a { color: inherit; }
img { max-width: 100%; }
ul { list-style: none; }

::selection { background: var(--accent); color: var(--on-accent); }
.prose ::selection, .crs-prose ::selection { background: var(--select-read); color: var(--ink); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
:focus:not(:focus-visible) { outline: none; }

::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 99px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--line-stronger); }

.num { font-variant-numeric: tabular-nums; }
svg.i {
  width: 20px; height: 20px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ===== Shell: hub rail + content column ===== */
.app { display: grid; grid-template-columns: var(--rail) minmax(0, 1fr); min-height: 100vh; }
.main { min-width: 0; display: flex; flex-direction: column; }

/* The rail itself (.rail, .brand, .glabel, .nav) lives in /css/rail.css, shared with the hub. */

/* ===== Library section bar (desktop tabs, phone brand bar) ===== */
.lib-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 16px clamp(16px, 2.6vw, 36px) 0;
}
.lib-brand { display: none; }
.lib-tabs-inner {
  display: flex; gap: 4px; padding: 4px; border-radius: var(--r-pill);
  background: var(--surface); border: 1px solid var(--line);
}
.lib-tabs-inner .lib-tab {
  display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 16px 0 13px;
  border-radius: var(--r-pill); font-size: 13.5px; font-weight: 600; color: var(--ink2); text-decoration: none; white-space: nowrap;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.lib-tabs-inner .lib-tab svg.i { width: 18px; height: 18px; }
.lib-tabs-inner .lib-tab:hover { color: var(--ink); }
.lib-tabs-inner .lib-tab.active { background: var(--ink); color: #fff; }
.bar-lock { margin-left: auto; display: none; }

.icon-btn {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: var(--r-sm);
  color: var(--ink2); transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), transform var(--t-fast) var(--spring);
}
.icon-btn:hover { background: var(--hover); color: var(--ink); }
.icon-btn:active { transform: scale(.94); }
.icon-btn:disabled { opacity: .35; pointer-events: none; }

/* ===== Phone tab bar (floating, dark) ===== */
.tabbar { display: none; }

/* ===== Reader bar ===== */
.reader-bar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 14px;
  padding: 6px clamp(10px, 2.6vw, 36px);
  padding-top: calc(6px + env(safe-area-inset-top, 0px));
  background: var(--bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-base) var(--ease);
}
.reader-bar.scrolled { border-bottom-color: var(--line); }
.rbar-back {
  display: inline-flex; align-items: center; gap: 4px; min-height: 44px; padding: 0 10px 0 4px;
  border-radius: var(--r-sm); color: var(--ink2); font-weight: 700; font-size: 14px; text-decoration: none; flex: none;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.rbar-back:hover { color: var(--ink); background: var(--hover); }
.rbar-track { flex: 1; height: 6px; border-radius: var(--r-pill); background: var(--accent-soft); overflow: hidden; max-width: 520px; margin-inline: auto; }
.progress-bar { height: 100%; width: 0%; border-radius: inherit; background: var(--accent); transition: width 120ms linear; }
.type-ctrl { display: flex; align-items: center; gap: 2px; flex: none; }
.font-toggle {
  min-height: 36px; min-width: 64px; padding: 0 12px; margin-left: 4px; border-radius: var(--r-pill);
  border: 1px solid var(--line); background: var(--surface); font-size: 13px; font-weight: 700; color: var(--ink);
  position: relative; transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--spring);
}
.font-toggle::after { content: ""; position: absolute; inset: -4px 0; }
.font-toggle:hover { border-color: var(--line-strong); }
.font-toggle:active { transform: scale(.95); }
[data-font="source-serif"] .font-toggle { font-family: var(--font-serif); }

/* ===== Content containers ===== */
#app { min-height: 60vh; padding-left: env(safe-area-inset-left, 0px); padding-right: env(safe-area-inset-right, 0px); }
.container { width: 100%; max-width: var(--measure); margin: 0 auto; padding: 22px clamp(16px, 2.6vw, 36px) 64px; }
.container.wide { max-width: 1240px; }

/* Page header: small line, then the title (mockup .top) */
.top { display: flex; align-items: flex-end; gap: 14px; margin-bottom: 20px; flex-wrap: wrap; }
.top .date { font-size: 13.5px; font-weight: 500; color: var(--ink2); }
.top h1 { font: 700 30px/1.1 var(--font); letter-spacing: -.02em; margin-top: 2px; }
.top .sp { flex: 1; }

/* ===== Cards (widgets) ===== */
.w {
  position: relative; min-width: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: var(--pad);
}
.w > header { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.w > header h2 { font: 700 15.5px/1.2 var(--font); }
.w > header .meta { margin-left: auto; font-size: 13px; font-weight: 600; color: var(--ink2); }
.slabel { font-size: 11.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--ink2); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 16px; border-radius: var(--r-sm);
  background: var(--surface); border: 1px solid var(--line); color: var(--ink);
  font-weight: 700; font-size: 14px; text-decoration: none; white-space: nowrap;
  transition: transform var(--t-fast) var(--spring), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.btn svg.i { width: 18px; height: 18px; }
.btn:hover { border-color: var(--line-strong); }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--ink-hover); border-color: var(--ink-hover); }

/* ===== Segmented switch (status tabs, sort) ===== */
.switch {
  display: inline-flex; gap: 4px; padding: 4px; border-radius: var(--r-pill);
  background: var(--surface); border: 1px solid var(--line);
}
.switch > button {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-height: 40px; padding: 0 15px; border-radius: var(--r-pill);
  font-weight: 600; font-size: 13.5px; color: var(--ink2); white-space: nowrap;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.switch > button:hover { color: var(--ink); }
.switch > button.active { background: var(--ink); color: #fff; }

/* ===== Search field ===== */
.search { position: relative; display: flex; align-items: center; flex: 1; min-width: 200px; }
.search > svg.i { position: absolute; left: 14px; width: 18px; height: 18px; color: var(--ink2); pointer-events: none; }
.search input {
  width: 100%; min-height: 48px; padding: 0 16px 0 42px;
  border-radius: var(--r-pill); border: 1px solid var(--line); background: var(--surface);
  font-size: 16px; color: var(--ink); outline: none; caret-color: var(--accent);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.search input::placeholder { color: var(--ink2); opacity: 1; }
.search input:focus { border-color: var(--accent); box-shadow: var(--focus); }
.search input::-webkit-search-cancel-button { -webkit-appearance: none; }

/* ===== Progress meter ===== */
.meter { height: 6px; border-radius: var(--r-pill); background: var(--accent-soft); overflow: hidden; }
.meter > i {
  display: block; height: 100%; border-radius: inherit; background: var(--accent);
  transform-origin: left; transform: scaleX(var(--p, 0));
  transition: transform .9s var(--ease);
  animation: grow .9s var(--ease) .15s backwards;
}
.meter.is-done > i { background: var(--good); }
@keyframes grow { from { transform: scaleX(0); } }

/* ===== Tags ===== */
.tag {
  display: inline-flex; align-items: center; gap: 5px; white-space: nowrap;
  font-size: 12px; font-weight: 700; line-height: 1; padding: 5px 9px; border-radius: var(--r-pill);
  background: var(--accent-soft); color: var(--accent-ink);
}
.tag.good { background: var(--good-soft); color: var(--good-ink); }
.tag.warn { background: var(--warn-soft); color: var(--warn-ink); }
.tag.muted { background: var(--hover); color: var(--ink2); }
.tag svg.i { width: 14px; height: 14px; }

/* ===== Empty and loading states ===== */
.empty-state {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  padding: 40px 24px; text-align: center; grid-column: 1 / -1;
}
.empty-state b { display: block; font: 700 20px/1.2 var(--font); margin-bottom: 6px; color: var(--ink); }
.empty-state p { color: var(--ink2); max-width: 44ch; margin: 0 auto; }
.empty-state .btn { margin-top: 16px; }

.loading {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  padding: 72px 16px; color: var(--ink2); font-size: 14px; font-weight: 600;
}
.loading::before {
  content: ""; width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--accent-soft); border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Skeletons (list cold load): flat blocks that breathe, no shimmer gradient */
.skel { background: var(--line-soft); border-radius: 6px; animation: breathe 1.4s ease-in-out infinite; }
@keyframes breathe { 50% { opacity: .55; } }
.skeleton-card { pointer-events: none; }
.skeleton-card .skel-line { height: 12px; margin-top: 10px; }
.skeleton-card .skel-line:first-child { margin-top: 0; }

/* ===== Motion system ===== */
/* Arrival: rise 14px and fade, staggered 45ms, once per screen load. `backwards`
   fill so no transform lingers after the entrance (popovers position by page
   coordinates and must never inherit a transformed ancestor). */
.rise { animation: rise var(--t-slow) var(--ease) backwards; animation-delay: calc(min(var(--i, 0), 12) * 45ms); }
@keyframes rise { from { opacity: 0; transform: translateY(14px) scale(.985); } }
#app.view-enter { animation: fadeIn var(--t-base) var(--ease) backwards; }
@keyframes fadeIn { from { opacity: 0; } }

@media (hover: hover) {
  .lift { transition: transform var(--t-base) var(--ease), border-color var(--t-fast) var(--ease); }
  .lift:hover { transform: translateY(-2px); border-color: var(--line-strong); }
}

/* Completion burst: small dots, 600ms */
.burst {
  position: fixed; z-index: 3000; pointer-events: none;
  width: 6px; height: 6px; margin: -3px 0 0 -3px; border-radius: 50%; background: var(--accent);
  animation: burst .6s var(--ease) forwards;
}
.burst:nth-child(3n) { background: var(--good); }
@keyframes burst { to { transform: translate(var(--dx), var(--dy)) scale(0); opacity: 0; } }

/* View Transitions: cross-fade between screens, the card grows into the reader */
/* Kept short: Chrome ignores taps while a transition runs, so it must be over quickly */
::view-transition-old(root), ::view-transition-new(root) { animation-duration: .26s; animation-timing-function: var(--ease); }
::view-transition-group(lib-card) { animation-duration: .36s; animation-timing-function: var(--ease); }
::view-transition-old(lib-card), ::view-transition-new(lib-card) { animation-duration: .24s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
html.still { scroll-behavior: auto; }
html.still *, html.still *::before, html.still *::after { animation: none !important; transition: none !important; }

/* ===== Responsive ===== */
/* No mid-width rail override: the rail is the hub's, 236px at every desktop width. */
@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .lib-bar { padding: calc(10px + env(safe-area-inset-top, 0px)) 16px 0; }
  .lib-brand {
    display: flex; align-items: center; gap: 9px; min-height: 44px;
    font: 700 17px/1 var(--font); color: var(--ink); text-decoration: none; letter-spacing: -.01em;
  }
  .lib-brand svg { width: 30px; height: 30px; }
  .lib-tabs-inner { display: none; }
  .bar-lock { display: inline-grid; }
  .container, .container.wide { padding: 14px 16px calc(112px + env(safe-area-inset-bottom, 0px)); }
  .top { margin-bottom: 16px; }
  .top h1 { font-size: 26px; }
  .w { padding: 16px; }

  .tabbar {
    position: fixed; z-index: 50; left: 10px; right: 10px; bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 2px; padding: 6px;
    background: var(--hero); border-radius: calc(var(--r) + 4px);
    box-shadow: 0 14px 30px -12px rgba(0,0,0,.45);
  }
  .tabbar .lib-tab {
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
    min-height: 52px; border-radius: var(--r); color: var(--hero-sub); text-decoration: none;
    font-size: 11.5px; font-weight: 700; letter-spacing: .01em;
    transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
  }
  .tabbar .lib-tab.active { background: var(--hero-track); color: #fff; }
  .tabbar .lib-tab:active svg.i { transform: scale(.9); }
  .tabbar .lib-tab svg.i { transition: transform var(--t-fast) var(--spring); }

  body.is-reading .tabbar { display: none; }
  .reader-bar { gap: 6px; }
  .rbar-back span { display: none; }
  .rbar-back { padding: 0 6px; }
}
@media (max-width: 380px) {
  .tabbar .lib-tab { font-size: 11px; }
  .font-toggle { min-width: 56px; padding: 0 9px; }
}