/* =========================================================
   情诗简史 · timeline
   页头 + 左侧吸顶年代目录 + 卷轴时代区块 + 诗人小传
   ========================================================= */

/* ---------------- 页头 ---------------- */
.tl-hero {
  position: relative;
  padding: clamp(36px, 5.6vw, 84px) 0 clamp(20px, 3vw, 40px);
  overflow: hidden;
}
.tl-hero::before {
  content: "";
  position: absolute; inset: -24% -10% auto;
  height: 82%;
  background:
    radial-gradient(56% 78% at 14% 34%, color-mix(in srgb, var(--glow) 52%, transparent), transparent 72%),
    radial-gradient(42% 64% at 90% 4%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 72%);
  pointer-events: none;
}
.tl-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.46fr) minmax(240px, .54fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: end;
}
.tl-hero__eyebrow { margin-bottom: clamp(18px, 3vh, 28px); }
.tl-hero__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(38px, 6.2vw, 88px);
  line-height: 1.14;
  letter-spacing: .09em;
  color: var(--ink);
  text-wrap: balance;
}
.tl-hero__line { display: block; }
.tl-hero__line--accent {
  margin-top: .18em;
  font-size: .56em;
  letter-spacing: .24em;
  color: var(--accent-2);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 24px);
}
.tl-hero__line--accent::after {
  content: ""; flex: 1; max-width: 210px; height: 1px;
  background: linear-gradient(90deg, currentColor, transparent);
  opacity: .5;
}
.tl-hero__lede { margin-top: clamp(20px, 3vh, 32px); max-width: 42em; }
.tl-hero__stats {
  display: flex;
  gap: clamp(22px, 3.4vw, 42px);
  margin-top: clamp(28px, 4vh, 44px);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line);
  max-width: 460px;
  flex-wrap: wrap;
}
.tl-hero__stats > div { display: flex; flex-direction: column-reverse; gap: 2px; }
.tl-hero__stats dt { font-size: var(--fs-xs); letter-spacing: .18em; color: var(--ink-3); }
.tl-hero__stats dd { margin: 0; font-size: clamp(20px, 2vw, 27px); line-height: 1.1; color: var(--ink); }

.tl-hero__aside {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-6);
  padding-bottom: var(--sp-2);
}
.tl-hero__vertical {
  writing-mode: vertical-rl;
  font-size: clamp(20px, 1.8vw, 26px);
  line-height: 2.2;
  letter-spacing: .34em;
  color: var(--ink-3);
  padding-left: var(--sp-4);
  border-left: 1px solid var(--line);
  max-height: 260px;
  opacity: .9;
}
.tl-hero__aside-foot { display: flex; flex-direction: column; gap: var(--sp-4); align-items: flex-start; padding-bottom: var(--sp-4); }
.tl-hero__aside-foot .link { font-size: var(--fs-sm); }
.tl-hero__foot {
  position: relative;
  display: flex; align-items: center; gap: var(--sp-4);
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: var(--sp-4);
}
.tl-hero__foot-line { flex: 1; height: 1px; background: linear-gradient(90deg, transparent, var(--line-2), transparent); }
.tl-hero__foot-en { font-size: var(--fs-xs); letter-spacing: .24em; color: var(--ink-3); white-space: nowrap; }

/* ---------------- 两栏布局（目录 + 卷轴） ---------------- */
.tl-eras-section { padding-top: clamp(24px, 3.4vw, 48px); }
.tl-layout {
  display: grid;
  grid-template-columns: 224px minmax(0, 1fr);
  gap: clamp(36px, 5vw, 84px);
}

/* ---------------- 吸顶年代目录 ---------------- */
.tl-nav {
  position: sticky;
  top: calc(var(--nav-h) + 28px);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  max-height: calc(100vh - var(--nav-h) - 56px);
  overflow-y: auto;
  scrollbar-width: thin;
  padding-bottom: var(--sp-2);
}
.tl-nav__label { padding-bottom: var(--sp-3); border-bottom: 1px solid var(--line-2); }
.tl-nav__list { display: flex; flex-direction: column; }
.tl-nav__item {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: var(--sp-3);
  align-items: baseline;
  padding: 10px 0 10px var(--sp-4);
  border-bottom: 1px solid var(--line);
  transition: background var(--dur-mic) var(--ease), padding var(--dur-mic) var(--ease);
}
.tl-nav__item::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 2px; height: 0;
  background: var(--accent);
  transform: translateY(-50%);
  transition: height var(--dur-mid) var(--ease);
}
.tl-nav__item:hover { background: color-mix(in srgb, var(--surface) 42%, transparent); }
.tl-nav__item:hover::before { height: 46%; }
.tl-nav__item.is-on::before { height: 72%; }
.tl-nav__no {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  transition: color var(--dur-mic) var(--ease);
}
.tl-nav__body { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.tl-nav__name {
  font-family: var(--font-serif);
  font-size: 15.5px;
  letter-spacing: .12em;
  color: var(--ink-2);
  transition: color var(--dur-mic) var(--ease);
}
.tl-nav__years {
  font-size: 10px;
  letter-spacing: .04em;
  color: var(--ink-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: .85;
}
.tl-nav__item:hover .tl-nav__name { color: var(--ink); }
.tl-nav__item.is-on .tl-nav__name { color: var(--accent); }
.tl-nav__item.is-on .tl-nav__no { color: var(--accent-2); }
.tl-nav__poets {
  display: flex; flex-direction: column; gap: 2px;
  padding-top: var(--sp-4);
  margin-top: var(--sp-1);
  border-top: 1px solid var(--line-2);
  color: var(--ink-2);
  transition: color var(--dur-mic) var(--ease);
}
.tl-nav__poets-cn { font-family: var(--font-serif); font-size: 14px; letter-spacing: .1em; }
.tl-nav__poets-en { font-size: 9.5px; letter-spacing: .26em; color: var(--ink-3); }
.tl-nav__poets:hover { color: var(--accent); }

/* ---------------- 卷轴 ---------------- */
.tl-content {
  --spine-x: clamp(24px, 3.6vw, 52px);
  position: relative;
  min-width: 0;
  padding-left: var(--spine-x);
}
.tl-content::before {
  content: "";
  position: absolute;
  left: 0; top: 10px; bottom: 40px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-2), var(--line) 38%, var(--line) 82%, transparent);
}

.tl-era {
  position: relative;
  padding-bottom: clamp(52px, 7vw, 100px);
  scroll-margin-top: calc(var(--nav-h) + 28px);
}
.tl-era:last-child { padding-bottom: 8px; }
.tl-era::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--spine-x) - 4px);
  top: 9px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--bg) 80%, transparent),
              0 0 0 5px color-mix(in srgb, var(--accent-2) 24%, transparent);
}
.tl-era + .tl-era { padding-top: clamp(44px, 6vw, 84px); }
.tl-era + .tl-era::before { top: calc(clamp(44px, 6vw, 84px) + 9px); }

.tl-era__watermark {
  position: absolute;
  top: -8px; right: 0;
  z-index: 0;
  font-family: var(--font-display);
  font-size: clamp(88px, 12.5vw, 190px);
  line-height: 1;
  letter-spacing: -.02em;
  color: transparent;
  -webkit-text-stroke: 1px color-mix(in srgb, var(--ink) 16%, transparent);
  opacity: .6;
  pointer-events: none;
  user-select: none;
}
.tl-era > *:not(.tl-era__watermark) { position: relative; z-index: 1; }

.tl-era__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--line);
}
.tl-era__title-wrap { display: flex; flex-direction: column; gap: 6px; }
.tl-era__index {
  font-family: var(--font-display);
  font-size: 10.5px;
  letter-spacing: .28em;
  color: var(--ink-3);
}
.tl-era__name {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(28px, 3.8vw, 52px);
  line-height: 1.16;
  letter-spacing: .1em;
  color: var(--ink);
}
.tl-era__years {
  font-family: var(--font-display);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  color: var(--ink-3);
  white-space: nowrap;
  margin-top: 1px;
}
.tl-era__summary {
  margin-top: var(--sp-5);
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 2.08;
  letter-spacing: .035em;
  color: var(--ink-2);
  max-width: 54ch;
}

.tl-era__highlights {
  margin: clamp(24px, 3.4vw, 40px) 0;
  padding-left: clamp(16px, 2vw, 26px);
  border-left: 1px solid var(--accent-2);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.tl-era__line {
  font-family: var(--font-serif);
  font-size: clamp(18px, 1.9vw, 25px);
  line-height: 1.95;
  letter-spacing: .1em;
  color: var(--ink);
}
.tl-era__line + .tl-era__line {
  font-size: clamp(15px, 1.5vw, 19px);
  color: var(--ink-2);
  letter-spacing: .08em;
}

.tl-era__poems-head {
  display: flex; align-items: center; gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}
.tl-era__poems-head .rule { flex: 1; }
.tl-era__poems-head .eyebrow { white-space: nowrap; }
.tl-era__poems {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-block: 1px solid var(--line);
}
.tl-poem-card {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  min-width: 0;
  padding: var(--sp-4) var(--sp-4) calc(var(--sp-3) + 4px);
  background: var(--bg);
  transition: background var(--dur-mid) var(--ease), transform var(--dur-mid) var(--ease);
}
.tl-poem-card:hover {
  background: color-mix(in srgb, var(--surface-2) 58%, var(--bg));
  transform: translateY(-2px);
}
.tl-poem-card__no { font-family: var(--font-display); font-size: 10px; letter-spacing: .2em; color: var(--accent-2); }
.tl-poem-card__title {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.35vw, 19px);
  letter-spacing: .05em;
  line-height: 1.5;
  color: var(--ink);
  transition: color var(--dur-mic);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tl-poem-card:hover .tl-poem-card__title { color: var(--accent); }
.tl-poem-card__author { font-size: var(--fs-xs); color: var(--ink-3); letter-spacing: .06em; }
.tl-poem-card__line {
  margin-top: var(--sp-2);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--line);
  font-family: var(--font-serif);
  font-size: 12px;
  line-height: 1.85;
  color: var(--ink-3);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tl-poem-card__foot { margin-top: auto; padding-top: var(--sp-2); display: flex; justify-content: flex-end; }
.tl-poem-card__arrow {
  width: 26px; height: 26px; display: grid; place-items: center;
  border-radius: 50%; border: 1px solid var(--line);
  color: var(--ink-3);
  opacity: 0; transform: translateX(-4px);
  transition: all var(--dur-mic) var(--ease);
}
.tl-poem-card__arrow svg { width: 12px; height: 12px; }
.tl-poem-card:hover .tl-poem-card__arrow,
.tl-poem-card:focus-visible .tl-poem-card__arrow { opacity: 1; transform: none; color: var(--accent); border-color: var(--accent); }
.tl-era__poems-empty {
  padding: var(--sp-5);
  border: 1px dashed var(--line);
  border-radius: var(--r-sm);
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  color: var(--ink-3);
}

/* ---------------- 诗人小传 ---------------- */
.tl-poets { border-top: 1px solid var(--line); }
.tl-poets__count { font-size: var(--fs-xs); letter-spacing: .16em; color: var(--ink-3); }
.tl-poet-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.tl-poet {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  min-height: 172px;
  padding: clamp(16px, 1.8vw, 22px);
  background: var(--bg);
  text-align: left;
  transition: background var(--dur-mid) var(--ease);
}
.tl-poet:hover { background: color-mix(in srgb, var(--surface-2) 55%, var(--bg)); }
.tl-poet--filler { background: var(--bg); pointer-events: none; }
.tl-poet--filler:hover { background: var(--bg); }
.tl-poet__head { display: flex; align-items: center; gap: var(--sp-3); }
.tl-poet__seal {
  width: 44px; height: 44px; flex: none;
  display: grid; place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent-2) 58%, transparent);
  border-radius: 4px;
  color: var(--accent-2);
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1;
  transform: rotate(-3deg);
  transition: transform var(--dur-mid) var(--ease), border-color var(--dur-mid) var(--ease);
}
.tl-poet:hover .tl-poet__seal { transform: rotate(0deg) scale(1.04); border-color: var(--accent-2); }
.tl-poet__id { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.tl-poet__name { font-family: var(--font-serif); font-size: 17px; letter-spacing: .1em; color: var(--ink); }
.tl-poet__life { font-family: var(--font-display); font-size: 10.5px; letter-spacing: .1em; color: var(--ink-3); }
.tl-poet__line {
  font-family: var(--font-serif);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--ink-2);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tl-poet__foot {
  margin-top: auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-2);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--line);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--ink-3);
}
.tl-poet__arrow {
  width: 24px; height: 24px; display: grid; place-items: center;
  border-radius: 50%; border: 1px solid var(--line);
  opacity: 0; transform: translateX(-4px);
  transition: all var(--dur-mic) var(--ease);
}
.tl-poet__arrow svg { width: 12px; height: 12px; }
.tl-poet:hover .tl-poet__arrow, .tl-poet:focus-visible .tl-poet__arrow { opacity: 1; transform: none; color: var(--accent); border-color: var(--accent); }
.tl-poets__note { margin-top: var(--sp-5); }
.tl-poets__empty { margin-top: var(--sp-6); }
.tl-empty { padding-block: clamp(48px, 8vw, 96px); }

/* ---------------- 诗人弹层 ---------------- */
.poet-modal { display: flex; flex-direction: column; gap: var(--sp-5); }
.poet-modal__head { display: flex; align-items: center; gap: var(--sp-4); }
.poet-modal__seal {
  width: 66px; height: 66px; flex: none;
  display: grid; place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent-2) 62%, transparent);
  border-radius: 5px;
  color: var(--accent-2);
  font-family: var(--font-serif);
  font-size: 28px;
  line-height: 1;
  transform: rotate(-3deg);
}
.poet-modal__meta { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.poet-modal__life { font-family: var(--font-display); font-size: 12px; letter-spacing: .18em; color: var(--ink-3); }
.poet-modal__tags { display: flex; flex-wrap: wrap; gap: 5px; }
.poet-modal__oneline {
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.95;
  letter-spacing: .06em;
  color: var(--ink);
  padding-left: var(--sp-4);
  border-left: 1px solid var(--accent-2);
}
.poet-modal__bio { display: flex; flex-direction: column; gap: .85em; }
.poet-modal__bio p { font-family: var(--font-serif); font-size: 13.5px; line-height: 2.02; color: var(--ink-2); letter-spacing: .02em; }
.poet-modal__works { border-top: 1px solid var(--line); padding-top: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-2); }
.poet-modal__works h4 { font-family: var(--font-sans); font-size: var(--fs-xs); letter-spacing: .2em; font-weight: 400; color: var(--ink-3); }
.poet-modal__work {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: var(--sp-3);
  padding: 9px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
  transition: color var(--dur-mic), padding var(--dur-mic);
}
.poet-modal__work:hover { color: var(--accent); padding-left: var(--sp-2); }
.poet-modal__work b { font-family: var(--font-serif); font-weight: 400; font-size: 14.5px; letter-spacing: .05em; color: var(--ink); }
.poet-modal__work span { font-size: var(--fs-xs); color: var(--ink-3); white-space: nowrap; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1180px) {
  .tl-era__poems { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tl-poet-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 980px) {
  .tl-hero__inner { grid-template-columns: 1fr; align-items: start; gap: 32px; }
  .tl-hero__aside { align-items: center; padding-bottom: 0; }
  .tl-hero__vertical { max-height: 180px; }
  .tl-layout { display: block; }
  .tl-nav-col {
    position: sticky;
    top: var(--nav-h);
    z-index: 28;
    margin-bottom: var(--sp-6);
    background: color-mix(in srgb, var(--bg) 86%, transparent);
    backdrop-filter: blur(18px) saturate(140%);
    border-block: 1px solid var(--line);
  }
  .tl-nav {
    position: static;
    display: block;
    max-height: none;
    overflow: visible;
    margin-bottom: 0;
    padding-block: 7px;
    border-block: 0;
    background: none;
    backdrop-filter: none;
  }
  .tl-nav__label, .tl-nav__poets { display: none; }
  .tl-nav__list { flex-direction: row; gap: 4px; overflow-x: auto; scrollbar-width: none; padding-block: 2px; }
  .tl-nav__list::-webkit-scrollbar { display: none; }
  .tl-nav__li { flex: none; }
  .tl-nav__item {
    display: inline-flex;
    align-items: baseline;
    gap: 7px;
    padding: 7px 11px;
    border-bottom: 0;
    border-radius: var(--r-full);
  }
  .tl-nav__item::before { display: none; }
  .tl-nav__item.is-on { background: var(--accent-soft); }
  .tl-nav__body { flex-direction: row; align-items: baseline; gap: 7px; }
  .tl-nav__years { display: none; }
  .tl-nav__no { font-size: 10px; }
  .tl-nav__name { font-size: 13.5px; letter-spacing: .08em; white-space: nowrap; }
  .tl-content { padding-left: clamp(20px, 3.6vw, 40px); }
  .tl-era { scroll-margin-top: calc(var(--nav-h) + 70px); }
  .tl-poet-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .tl-hero__aside { display: none; }
  .tl-hero__foot-line { display: none; }
  .tl-hero__foot-en { display: none; }
  .tl-hero__foot { justify-content: flex-start; }
  .tl-era__poems {
    display: flex;
    gap: var(--sp-3);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    background: transparent;
    border-block: 0;
    padding-bottom: var(--sp-2);
    margin-inline: calc(-1 * var(--pad-x));
    padding-inline: var(--pad-x);
    scrollbar-width: none;
  }
  .tl-era__poems::-webkit-scrollbar { display: none; }
  .tl-poem-card {
    flex: 0 0 min(78vw, 300px);
    scroll-snap-align: start;
    border: 1px solid var(--line);
    border-radius: var(--r-sm);
    padding: var(--sp-4);
  }
  .tl-era__watermark { font-size: clamp(70px, 18vw, 120px); opacity: .38; top: -4px; }
  .tl-era__poems-head .eyebrow { font-size: 10px; letter-spacing: .18em; }
}
@media (max-width: 640px) {
  .tl-hero__title { letter-spacing: .06em; }
  .tl-hero__line--accent { letter-spacing: .16em; }
  .tl-hero__stats { gap: 16px; }
  .tl-poet-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tl-poet { min-height: 158px; padding: 14px; }
  .tl-poet__seal { width: 38px; height: 38px; font-size: 16px; }
  .tl-poet__name { font-size: 15.5px; }
  .tl-era__highlights { padding-left: var(--sp-4); }
  .tl-era + .tl-era { padding-top: 40px; }
  .tl-era + .tl-era::before { top: 49px; }
  .poet-modal__head { align-items: flex-start; }
  .poet-modal__seal { width: 54px; height: 54px; font-size: 23px; }
}