/* 基础样式沿用「哲学真题」站 */
:root {
  --bg: #fdf6ec;
  --bg-deep: #f5ece0;
  --text: #3d2c2e;
  --muted: rgba(61, 44, 46, 0.68);
  --faint: rgba(61, 44, 46, 0.42);
  --line: rgba(61, 44, 46, 0.14);
  --accent: #c2714f;
  --accent-soft: rgba(194, 113, 79, 0.12);
  --done: #9c4d2c;
  --doing: #d8875e;
  --sheet: rgba(255, 255, 255, 0.62);
  --max-width: 720px;
  --body-font: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --display-font: "Iowan Old Style", "Palatino Linotype", "Noto Serif SC",
    "Source Han Serif SC", "Songti SC", serif;
  --radius: 18px;
  --timing: 620ms;
  --ease: cubic-bezier(0.22, 0.8, 0.24, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--body-font);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.35), transparent 24%),
    radial-gradient(circle at top left, rgba(194, 113, 79, 0.08), transparent 34%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-attachment: fixed;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(61, 44, 46, 0.2) 0.7px, transparent 0.8px),
    radial-gradient(circle at 18px 10px, rgba(194, 113, 79, 0.12) 0.6px, transparent 0.7px);
  background-size: 24px 24px, 29px 29px;
  mix-blend-mode: multiply;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 180ms ease;
}

a,
button {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

a:hover,
a:focus-visible,
button:hover,
button:focus-visible {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible,
.card:focus-visible {
  outline: 2px solid rgba(194, 113, 79, 0.45);
  outline-offset: 3px;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
  padding: 0;
}

button:disabled {
  cursor: default;
}

[hidden] {
  display: none !important;
}

.page-shell {
  width: min(100%, calc(var(--max-width) + 3rem));
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  position: relative;
}

.site-header {
  margin-bottom: 1.9rem;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.site-title {
  font-family: var(--display-font);
  font-size: 1.46rem;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  font-size: 1rem;
  color: var(--muted);
}

.site-nav__link {
  font-family: var(--display-font);
  letter-spacing: 0.03em;
}

.site-nav__link.is-active {
  color: var(--text);
}

.site-nav__sep {
  width: 1px;
  height: 0.9em;
  background: var(--line);
}

.page-main {
  max-width: var(--max-width);
  margin: 0 auto;
}

.reveal {
  opacity: 0;
  animation: fade-up var(--timing) ease forwards;
  animation-delay: calc(var(--stagger, 0) * 0.12s);
}

.section-headline {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 0.9rem;
}

.section-headline h2 {
  margin: 0;
  font-family: var(--display-font);
  font-size: 1.08rem;
  font-weight: 600;
}

.picked-copy {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

.text-button {
  color: var(--muted);
  font-size: 0.92rem;
}

/* ---------- 范围（哲学家筛选） ---------- */

.scope {
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.scope__bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.scope__label {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  min-width: 0;
}

.scope__value {
  margin-left: 0.55em;
  color: var(--text);
  font-family: var(--display-font);
  font-size: 1.04rem;
}

.scope__total {
  margin-left: 0.55em;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.scope__toggle {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.9rem;
}

.scope__panel {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition:
    grid-template-rows 460ms var(--ease),
    opacity 320ms ease;
}

.scope.is-open .scope__panel {
  grid-template-rows: 1fr;
  opacity: 1;
}

.scope__panel > div {
  overflow: hidden;
}

.scope__groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem 1.35rem;
  padding-top: 1rem;
}

.option-group {
  display: grid;
  gap: 0.4rem;
  align-content: start;
}

.option-group__label {
  margin: 0;
  color: var(--muted);
  font-family: var(--display-font);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.option-group__cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem 0.4rem;
}

.option-chip {
  border-radius: 999px;
  padding: 0.12rem 0.62rem;
  color: var(--muted);
  border: 1px solid transparent;
  font-size: 0.94rem;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.option-chip:hover {
  transform: translateY(-1px);
}

.option-chip.is-active {
  color: var(--accent);
  border-color: rgba(194, 113, 79, 0.26);
  background: var(--accent-soft);
}

.option-chip__n {
  margin-left: 0.3em;
  font-size: 0.76rem;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.scope__all {
  margin-top: 1rem;
}

/* ---------- 测试首页 ---------- */

.dash {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2.4rem;
}

.dash__col {
  min-width: 0;
}

.dash__num {
  margin: 0;
  font-family: var(--display-font);
  font-size: clamp(3rem, 9vw, 4.2rem);
  line-height: 1;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}

.dash__label {
  margin: 0.7rem 0 1.4rem;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.16em;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  border: 1px solid rgba(194, 113, 79, 0.3);
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--display-font);
  letter-spacing: 0.12em;
  transition:
    background-color 200ms ease,
    color 200ms ease,
    opacity 200ms ease,
    transform 200ms ease;
}

.pill:hover:not(:disabled) {
  background: var(--accent);
  color: #fff9f3;
  transform: translateY(-1px);
}

.pill:disabled {
  opacity: 0.38;
}

.batch {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-top: 0.9rem;
  color: var(--faint);
  font-size: 0.84rem;
}

.batch__opt {
  padding: 0 0.45rem;
  border-radius: 999px;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
  transition:
    color 180ms ease,
    background-color 180ms ease;
}

.batch__opt.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- 测试会话 ---------- */

.session {
  animation: fade-up 480ms ease both;
}

.session__bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  color: var(--muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.session__count {
  margin: 0;
  font-family: var(--display-font);
  letter-spacing: 0.06em;
}

.session__track {
  height: 2px;
  margin: 0.55rem 0 1.8rem;
  border-radius: 2px;
  background: var(--line);
  overflow: hidden;
}

.session__fill {
  width: 0;
  height: 100%;
  background: var(--accent);
  transition: width 560ms var(--ease);
}

.slide {
  animation: slide-in 440ms var(--ease) both;
}

.slide--prev {
  animation-name: slide-in-left;
}

.slide--next {
  animation-name: slide-in-right;
}

.slide.is-leaving {
  animation: slide-out 220ms ease both;
}

.meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.6rem;
  min-height: 2rem;
}

.meta__who {
  margin: 0;
  min-width: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.meta__name {
  font-family: var(--display-font);
  color: var(--text);
  letter-spacing: 0.06em;
}

.meta__src {
  margin-left: 0.6em;
  color: var(--faint);
}

.stars {
  display: inline-flex;
  flex: 0 0 auto;
  margin-right: -0.4rem;
}

.star {
  display: inline-grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  color: rgba(61, 44, 46, 0.18);
  transition:
    color 220ms ease,
    transform 220ms ease;
}

.star svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.star:hover {
  color: rgba(194, 113, 79, 0.5);
}

.star.is-on {
  color: var(--accent);
}

.star.is-pop {
  animation: pop 360ms var(--ease);
}

.sheet {
  background: var(--sheet);
  border: 1px solid rgba(61, 44, 46, 0.08);
  border-radius: var(--radius);
  box-shadow:
    0 1px 2px rgba(61, 44, 46, 0.04),
    0 22px 44px -30px rgba(61, 44, 46, 0.32);
  padding: 2.3rem 2.3rem 2.1rem;
}

.card {
  perspective: 1600px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  border-radius: var(--radius);
}

.card__inner {
  display: grid;
  transform-style: preserve-3d;
  transition: transform 680ms var(--ease);
}

.card.is-flipped .card__inner {
  transform: rotateY(180deg);
}

.card__face {
  grid-area: 1 / 1;
  min-height: 15rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card__face--back {
  transform: rotateY(180deg);
}

.card:active .card__face {
  box-shadow:
    0 1px 2px rgba(61, 44, 46, 0.04),
    0 14px 30px -24px rgba(61, 44, 46, 0.3);
}

.passage {
  margin: 0;
  font-family: var(--display-font);
  font-size: clamp(1.16rem, 1rem + 0.8vw, 1.38rem);
  line-height: 2.05;
  letter-spacing: 0.06em;
  text-align: justify;
  overflow-wrap: anywhere;
}

.blank {
  color: transparent;
  border-radius: 4px;
  background: rgba(194, 113, 79, 0.07);
  text-decoration: underline;
  text-decoration-color: rgba(61, 44, 46, 0.3);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.42em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  transition:
    background-color 360ms ease,
    text-decoration-color 360ms ease;
}

.blank > i {
  font-style: normal;
  color: transparent;
  transition: color 320ms ease;
  transition-delay: calc(min(var(--i), 24) * 16ms);
}

.card.is-shown .blank {
  background: transparent;
  text-decoration-color: rgba(194, 113, 79, 0.45);
}

.card.is-shown .blank > i {
  color: var(--accent);
}

.gloss {
  display: grid;
  gap: 1.1rem;
}

.gloss__row {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.8rem;
  align-items: baseline;
}

.gloss__k {
  color: var(--faint);
  font-family: var(--display-font);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  white-space: nowrap;
}

.gloss__v {
  margin: 0;
  line-height: 1.9;
  overflow-wrap: anywhere;
}

.gloss__v--tr {
  font-family: var(--display-font);
  font-size: 1.04rem;
}

.gloss__v--note,
.gloss__v--point {
  color: var(--muted);
  font-size: 0.94rem;
}

.hint {
  margin: 1rem 0 0;
  min-height: 1.6em;
  text-align: center;
  color: var(--faint);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  transition: opacity 240ms ease;
}

.grade {
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  margin-top: 1.1rem;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition:
    opacity 300ms ease,
    transform 300ms var(--ease);
}

.grade.is-ready {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.grade__btn {
  min-width: 8.4rem;
  padding: 0.62rem 1.3rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
  color: var(--muted);
  font-family: var(--display-font);
  letter-spacing: 0.14em;
  transition:
    background-color 200ms ease,
    border-color 200ms ease,
    color 200ms ease,
    transform 200ms ease;
}

.grade__btn:hover {
  transform: translateY(-1px);
  border-color: rgba(61, 44, 46, 0.24);
  color: var(--text);
}

.grade__btn--ok {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff9f3;
}

.grade__btn--ok:hover,
.grade__btn--ok:focus-visible {
  color: #fff9f3;
  border-color: var(--accent);
  background: #b6643f;
}

.finish {
  padding: 3.5rem 0 2rem;
  text-align: center;
}

.finish__title {
  margin: 0;
  font-family: var(--display-font);
  font-size: 1.7rem;
  letter-spacing: 0.14em;
}

.finish__sub {
  margin: 0.8rem 0 2rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- 背诵 ---------- */

.recite-stage {
  margin-top: 1.6rem;
  min-height: 20rem;
}

.rule {
  width: 2.4rem;
  height: 1px;
  margin: 1.7rem 0 1.4rem;
  background: var(--line);
}

.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.4rem;
}

.pager__btn {
  padding: 0.4rem 0.2rem;
  color: var(--muted);
  font-family: var(--display-font);
  letter-spacing: 0.06em;
  transition:
    color 180ms ease,
    opacity 180ms ease;
}

.pager__btn:disabled {
  opacity: 0.28;
  color: var(--muted);
}

.pager__count {
  margin: 0;
  color: var(--faint);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- 数据 ---------- */

.tiles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.tile__num {
  margin: 0;
  font-family: var(--display-font);
  font-size: clamp(2rem, 5.4vw, 2.7rem);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.tile__label {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
}

.block {
  margin-top: 2.3rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
}

.days {
  position: relative;
}

.days__plot {
  display: grid;
  grid-template-columns: repeat(30, minmax(0, 1fr));
  gap: 2px;
  height: 88px;
}

.day {
  display: flex;
  align-items: flex-end;
  height: 100%;
}

.day__bar {
  width: 100%;
  min-height: 2px;
  border-radius: 4px 4px 0 0;
  background: var(--accent);
  transform-origin: bottom;
  animation: grow 620ms var(--ease) both;
  animation-delay: calc(var(--d) * 14ms + 200ms);
  transition: opacity 160ms ease;
}

.day.is-empty .day__bar {
  height: 2px;
  border-radius: 1px;
  background: var(--line);
}

.days__plot:hover .day:not(:hover) .day__bar {
  opacity: 0.55;
}

.days__axis {
  display: flex;
  justify-content: space-between;
  margin-top: 0.45rem;
  color: var(--faint);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.tip {
  position: absolute;
  bottom: calc(100% - 0.4rem);
  transform: translateX(-50%);
  padding: 0.3rem 0.65rem;
  border-radius: 10px;
  background: rgba(61, 44, 46, 0.92);
  color: #fff9f3;
  font-size: 0.8rem;
  white-space: nowrap;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
  opacity: 0;
  transition: opacity 140ms ease;
}

.tip.is-on {
  opacity: 1;
}

.legend {
  display: flex;
  gap: 0.9rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.swatch {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 3px;
}

.swatch--done,
.seg--done {
  background: var(--done);
}

.swatch--doing,
.seg--doing {
  background: var(--doing);
}

.people {
  display: grid;
  gap: 1.3rem;
}

.people__group {
  display: grid;
  gap: 0.55rem;
}

.prow {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr) 5.4rem;
  gap: 0.9rem;
  align-items: center;
}

.prow__name {
  font-family: var(--display-font);
  font-size: 0.96rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.prow__bar {
  display: flex;
  gap: 2px;
  height: 6px;
  border-radius: 3px;
  background: rgba(61, 44, 46, 0.07);
  overflow: hidden;
}

.seg {
  border-radius: 3px;
  transform-origin: left;
  animation: grow-x 700ms var(--ease) both;
  animation-delay: 240ms;
}

.prow__n {
  color: var(--muted);
  font-size: 0.82rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.5rem;
  margin-bottom: 0.7rem;
}

.tab__n {
  margin-left: 0.3em;
  font-size: 0.78rem;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.plist__item {
  display: block;
  padding: 0.85rem 0 0.9rem;
  border-top: 1px solid var(--line);
  animation: fade-up 360ms ease both;
  animation-delay: calc(min(var(--k), 12) * 30ms);
}

.plist__text {
  margin: 0;
  font-family: var(--display-font);
  font-size: 1.02rem;
  line-height: 1.75;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.plist__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.9rem;
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.plist__stars {
  color: var(--accent);
  letter-spacing: 0.1em;
}

.empty {
  padding: 1.4rem 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.6rem;
  transform: translate(-50%, 12px);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: rgba(61, 44, 46, 0.92);
  color: #fff9f3;
  font-size: 0.88rem;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 240ms ease,
    transform 240ms var(--ease);
  z-index: 5;
}

.toast.is-on {
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
}

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(22px);
  }
}

@keyframes slide-in-left {
  from {
    opacity: 0;
    transform: translateX(-22px);
  }
}

@keyframes slide-out {
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

@keyframes pop {
  40% {
    transform: scale(1.3);
  }
}

@keyframes grow {
  from {
    transform: scaleY(0);
  }
}

@keyframes grow-x {
  from {
    transform: scaleX(0);
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding: 1.4rem 1rem 3rem;
  }

  .site-nav {
    gap: 0.9rem;
  }

  .sheet {
    padding: 1.7rem 1.35rem 1.6rem;
  }

  .card__face {
    min-height: 13rem;
  }

  .tiles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.3rem 1rem;
  }

  .prow {
    grid-template-columns: 5.6rem minmax(0, 1fr) 4.6rem;
    gap: 0.7rem;
  }

  .grade__btn {
    min-width: 0;
    flex: 1 1 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
}