:root {
  --reading-progress: 0;
  --mobile-reading-nav-height: 64px;
}

.reading-rail,
.mobile-reading-nav,
.mobile-outline-backdrop,
.mobile-outline-sheet {
  font-family: ui-sans-serif, system-ui, "PingFang SC", sans-serif;
}

.reading-rail,
.mobile-reading-nav,
.mobile-outline-backdrop,
.mobile-outline-sheet {
  display: none;
}

@media (min-width: 1180px) {
  body {
    padding-right: 216px;
  }

  .reading-rail {
    position: fixed;
    top: 50%;
    right: 16px;
    z-index: 32;
    display: block;
    width: 184px;
    padding: 12px;
    border: 1px solid rgba(156, 64, 56, .18);
    border-radius: 18px;
    background: rgba(255, 253, 248, .92);
    box-shadow: 0 18px 45px rgba(66, 49, 32, .14);
    backdrop-filter: blur(16px);
    transform: translateY(-50%);
  }

  .rail-home {
    display: flex;
    align-items: center;
    min-height: 40px;
    padding: 0 11px;
    border-radius: 11px;
    color: #fffdf8;
    background: #263d42;
    text-decoration: none;
    font-size: 12px;
    font-weight: 800;
  }

  .rail-home:hover {
    color: #fffdf8;
    background: #315c68;
  }

  .rail-heading,
  .rail-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .rail-heading {
    padding: 14px 4px 8px;
    color: #6f675c;
    font-size: 10px;
    letter-spacing: .08em;
  }

  .rail-heading strong {
    color: #9c4038;
    font-size: 13px;
    letter-spacing: 0;
  }

  .rail-track {
    position: relative;
    display: grid;
    gap: 1px;
    padding-left: 18px;
  }

  .rail-track::before,
  .rail-progress-fill {
    position: absolute;
    top: 14px;
    left: 5px;
    width: 2px;
    border-radius: 99px;
    content: "";
  }

  .rail-track::before {
    bottom: 14px;
    background: #d8cbb9;
  }

  .rail-progress-fill {
    z-index: 1;
    height: calc(100% - 28px);
    background: #9c4038;
    transform: scaleY(var(--reading-progress));
    transform-origin: top;
    transition: transform .18s ease-out;
  }

  .rail-link {
    position: relative;
    display: grid;
    grid-template-columns: 32px 1fr;
    gap: 5px;
    align-items: center;
    min-height: 35px;
    padding: 3px 5px;
    border-radius: 9px;
    color: #625b52;
    text-decoration: none;
    font-size: 11px;
    line-height: 1.25;
  }

  .rail-link::before {
    position: absolute;
    left: -17px;
    z-index: 2;
    width: 8px;
    height: 8px;
    border: 2px solid #fffdf8;
    border-radius: 50%;
    background: #cbbdac;
    box-shadow: 0 0 0 1px #cbbdac;
    content: "";
  }

  .rail-link b {
    color: #9a7134;
    font-size: 10px;
    font-variant-numeric: tabular-nums;
  }

  .rail-link:hover,
  .rail-link.is-active {
    color: #23211e;
    background: #f1e5d6;
  }

  .rail-link.is-active {
    font-weight: 800;
  }

  .rail-link.is-active::before {
    width: 10px;
    height: 10px;
    background: #9c4038;
    box-shadow: 0 0 0 2px rgba(156, 64, 56, .16);
  }

  .rail-status {
    margin-top: 8px;
    padding: 8px 5px 2px;
    border-top: 1px solid #e5d9c9;
    color: #786f64;
    font-size: 10px;
  }

  .rail-status strong {
    color: #315c68;
    font-size: 11px;
    font-variant-numeric: tabular-nums;
  }

  .ai-launcher {
    right: 228px;
  }
}

@media (max-width: 1179px) {
  body {
    padding-bottom: calc(var(--mobile-reading-nav-height) + 24px + env(safe-area-inset-bottom));
  }

  .mobile-reading-nav {
    position: fixed;
    right: 12px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    left: 12px;
    z-index: 42;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    align-items: center;
    min-height: var(--mobile-reading-nav-height);
    padding: 7px;
    border: 1px solid rgba(255, 255, 255, .18);
    border-radius: 18px;
    color: #fffdf8;
    background: rgba(38, 61, 66, .96);
    box-shadow: 0 16px 38px rgba(35, 33, 30, .3);
    backdrop-filter: blur(16px);
  }

  .mobile-reading-nav a,
  .mobile-reading-nav button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    border: 0;
    border-radius: 12px;
    color: #fffdf8;
    background: transparent;
    text-decoration: none;
    font: 800 13px/1 ui-sans-serif, system-ui, "PingFang SC", sans-serif;
    cursor: pointer;
  }

  .mobile-reading-nav a::before {
    margin-right: 6px;
    color: #f1c77f;
    content: "←";
  }

  .mobile-reading-nav button {
    background: rgba(255, 255, 255, .1);
  }

  .mobile-reading-status {
    display: grid;
    justify-items: center;
    gap: 3px;
    line-height: 1;
  }

  .mobile-reading-status b {
    color: #f1c77f;
    font-size: 13px;
    font-variant-numeric: tabular-nums;
  }

  .mobile-reading-status small {
    color: #cbdad7;
    font-size: 10px;
    font-variant-numeric: tabular-nums;
  }

  .mobile-outline-backdrop {
    position: fixed;
    inset: 0;
    z-index: 43;
    width: 100%;
    height: 100%;
    border: 0;
    background: rgba(35, 33, 30, .42);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease;
  }

  .mobile-outline-sheet {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 44;
    display: block;
    max-height: min(78vh, 680px);
    overflow-y: auto;
    padding: 8px 18px calc(22px + env(safe-area-inset-bottom));
    border-radius: 24px 24px 0 0;
    background: #fffdf8;
    box-shadow: 0 -20px 60px rgba(35, 33, 30, .24);
    visibility: hidden;
    pointer-events: none;
    transform: translateY(105%);
    transition: transform .22s ease, visibility 0s linear .22s;
  }

  .mobile-outline-backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-outline-sheet.is-open {
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
    transition-delay: 0s;
  }

  .mobile-outline-handle {
    width: 42px;
    height: 4px;
    margin: 2px auto 9px;
    border-radius: 99px;
    background: #d8cbb9;
  }

  .mobile-outline-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 5px 1px 13px;
    border-bottom: 1px solid #eadfce;
  }

  .mobile-outline-header strong,
  .mobile-outline-header small {
    display: block;
  }

  .mobile-outline-header strong {
    color: #23211e;
    font-size: 17px;
  }

  .mobile-outline-header small {
    margin-top: 3px;
    color: #786f64;
    font-size: 11px;
  }

  .mobile-outline-close {
    flex: 0 0 40px;
    width: 40px;
    height: 40px;
    border: 1px solid #d8cbb9;
    border-radius: 50%;
    color: #315c68;
    background: #fff;
    font-size: 23px;
    line-height: 1;
    cursor: pointer;
  }

  .mobile-timeline {
    position: relative;
    display: grid;
    gap: 2px;
    padding: 12px 0 4px 22px;
  }

  .mobile-timeline::before {
    position: absolute;
    top: 32px;
    bottom: 24px;
    left: 10px;
    width: 2px;
    background: #e0d4c3;
    content: "";
  }

  .mobile-timeline-link {
    position: relative;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 8px;
    align-items: center;
    min-height: 49px;
    padding: 5px 10px;
    border-radius: 12px;
    color: #625b52;
    text-decoration: none;
    font-size: 14px;
  }

  .mobile-timeline-link::before {
    position: absolute;
    left: -16px;
    z-index: 1;
    width: 10px;
    height: 10px;
    border: 3px solid #fffdf8;
    border-radius: 50%;
    background: #cbbdac;
    box-shadow: 0 0 0 1px #cbbdac;
    content: "";
  }

  .mobile-timeline-link b {
    color: #9a7134;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
  }

  .mobile-timeline-link.is-active {
    color: #23211e;
    background: #f3e8d9;
    font-weight: 800;
  }

  .mobile-timeline-link.is-active::before {
    background: #9c4038;
    box-shadow: 0 0 0 3px rgba(156, 64, 56, .13);
  }

  .mobile-outline-home {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    margin-top: 8px;
    border-radius: 12px;
    color: #fffdf8;
    background: #263d42;
    text-decoration: none;
    font-size: 13px;
    font-weight: 800;
  }

  .mobile-outline-home:hover {
    color: #fffdf8;
  }

  body.mobile-outline-open {
    overflow: hidden;
  }

  .ai-launcher {
    bottom: calc(var(--mobile-reading-nav-height) + 24px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 420px) {
  .mobile-reading-nav {
    right: 8px;
    left: 8px;
  }

  .mobile-reading-nav a,
  .mobile-reading-nav button {
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rail-progress-fill,
  .mobile-outline-backdrop,
  .mobile-outline-sheet {
    transition: none;
  }
}

@media print {
  .reading-rail,
  .mobile-reading-nav,
  .mobile-outline-backdrop,
  .mobile-outline-sheet {
    display: none !important;
  }

  body {
    padding-right: 0;
    padding-bottom: 0;
  }
}