/* ==========================================================================
   等号 · P = NP? 的一个可玩模型
   页面级样式；基础 token / 字体 / .wrap / .eyebrow / .btn 来自 css/style.css。
   实验台里始终是暗色的：那是一个搜索空间，不是页面本身。
   ========================================================================== */

:root {
  --pnp-teal: #5fd3a3;
  --pnp-teal-dim: rgba(95, 211, 163, 0.18);
  --pnp-gold: var(--accent);
  --pnp-panel: #0a0d0e;
}

/* ------------------------------------------------------------------ 顶栏 */
.pnp-header {
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg);
}

.pnp-header__inner {
  display: flex;
  align-items: center;
  gap: 22px;
  height: 64px;
}

.pnp-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg-dim);
  font-size: 13px;
  transition: color 0.2s var(--ease);
}
.pnp-back:hover { color: var(--fg); }
.pnp-back span:first-child { font-family: var(--font-mono); }

.pnp-crumb {
  padding-left: 22px;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.pnp-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--accent);
}
.pnp-badge i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

/* ------------------------------------------------------------------ 首屏 */
.pnp-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  padding-block: clamp(52px, 8vw, 94px) clamp(24px, 4vw, 46px);
}

.pnp-hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(82px, 14vw, 166px);
  line-height: 0.9;
  letter-spacing: 0.05em;
  text-indent: -0.04em;
}

.pnp-hero__sub {
  margin: 16px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 27px);
  letter-spacing: 0.12em;
  color: var(--fg-dim);
}

.pnp-hero__lede {
  max-width: 620px;
  margin: 24px 0 0;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.95;
  color: var(--fg-dim);
}
.pnp-hero__lede em {
  font-style: normal;
  color: var(--fg);
  border-bottom: 1px solid var(--accent);
}

.pnp-hero__note {
  max-width: 58ch;
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent-soft);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--muted);
}

.pnp-formula {
  position: relative;
  justify-self: end;
  display: flex;
  align-items: baseline;
  gap: 0.06em;
  font-family: var(--font-serif);
  font-size: clamp(58px, 9vw, 118px);
  line-height: 0.95;
  color: var(--fg);
  user-select: none;
}
.pnp-formula__eq { color: var(--accent); padding-inline: 0.04em; }
.pnp-formula__q {
  display: inline-block;
  margin-left: 0.08em;
  font-size: 0.58em;
  color: var(--muted);
  transform: translateY(-0.55em) rotate(7deg);
  animation: pnp-q-pulse 3.4s var(--ease) infinite;
}
.pnp-formula small {
  position: absolute;
  left: 2px;
  bottom: -22px;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.2em;
  color: var(--muted);
  white-space: nowrap;
}
@keyframes pnp-q-pulse {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}

/* ------------------------------------------------------------------ 定义 */
.pnp-defs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}
.pnp-def {
  background: var(--bg);
  padding: clamp(18px, 2.6vw, 28px);
}
.pnp-def__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
}
.pnp-def h2 {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 500;
}
.pnp-def p {
  margin: 0;
  color: var(--fg-dim);
  font-size: 13px;
  line-height: 1.85;
}
.pnp-def--open { background: var(--bg-soft); }

/* --------------------------------------------------------------- 小标题组 */
.pnp-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: clamp(22px, 3.6vw, 38px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}
.pnp-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.65rem, 3.4vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
}
.pnp-head__note {
  max-width: 46ch;
  margin: 0;
  color: var(--fg-dim);
  font-size: 13.5px;
  line-height: 1.85;
}

/* ------------------------------------------------------------- 子集和实验 */
.pnp-lab { margin-top: clamp(56px, 9vw, 100px); }

.pnp-lab__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: clamp(14px, 2.2vw, 24px);
  align-items: stretch;
}

.pnp-find,
.pnp-searchbox {
  display: flex;
  flex-direction: column;
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.pnp-find { background: var(--bg-soft); }

.pnp-target {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line-soft);
}
.pnp-target > span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.pnp-target b {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 500;
  line-height: 1;
  color: var(--accent);
}
.pnp-target em {
  margin-left: auto;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

.pnp-tiles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 7px;
  margin: 15px 0 12px;
}

.pnp-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1.28;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  transition: border-color 0.16s var(--ease), background 0.16s var(--ease), transform 0.16s var(--ease);
}
.pnp-tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.pnp-tile[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.pnp-tile b {
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.5vw, 18px);
  font-weight: 500;
  line-height: 1;
}
.pnp-tile small {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 7.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.pnp-tile[aria-pressed="true"] small { color: var(--accent); }

.pnp-sum {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 13px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
}
.pnp-sum b {
  font-size: 21px;
  font-weight: 500;
  color: var(--fg);
}
.pnp-delta {
  margin-left: auto;
  font-size: 9.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
}
.pnp-delta.is-over { color: #c98b6d; }
.pnp-delta.is-ok { color: var(--accent); }

.pnp-verify {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 72px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--bg);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.pnp-verify__icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 33px;
  height: 33px;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}
.pnp-verify__body { min-width: 0; }
.pnp-verify__body b {
  display: block;
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.4;
}
.pnp-verify__body p {
  margin: 2px 0 0;
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
}
.pnp-verify__time {
  margin-left: auto;
  align-self: flex-start;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--muted);
  white-space: nowrap;
}
.pnp-verify.is-ok { border-color: rgba(95, 211, 163, 0.55); background: rgba(95, 211, 163, 0.06); }
.pnp-verify.is-ok .pnp-verify__icon { color: var(--pnp-teal); border-color: rgba(95, 211, 163, 0.55); }
.pnp-verify.is-ok .pnp-verify__body b { color: var(--fg); }
.pnp-verify.is-over { border-color: rgba(201, 139, 109, 0.5); }
.pnp-verify.is-over .pnp-verify__icon { color: #c98b6d; border-color: rgba(201, 139, 109, 0.5); }

.pnp-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 13px;
}
.pnp-actions .btn {
  height: 33px;
  padding: 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.02em;
}
.pnp-actions .btn:disabled { opacity: 0.45; cursor: wait; transform: none; }
.pnp-hypo-btn {
  border-style: dashed;
  color: var(--accent);
}
.pnp-hypo-btn:hover { color: var(--accent); border-color: var(--accent); }

.pnp-hypo-note {
  margin: 11px 0 0;
  padding: 9px 11px;
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
  font-size: 11px;
  line-height: 1.7;
  color: var(--fg-dim);
}

/* ---------------------------------------------------------------- 搜索空间 */
.pnp-searchbox {
  border-color: rgba(255, 255, 255, 0.1);
  background: var(--pnp-panel);
  color: #ecedf1;
}
.pnp-searchbox__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.14em;
  color: rgba(236, 237, 241, 0.48);
}
.pnp-searchbox__head b {
  font-weight: 500;
  font-size: 10px;
  letter-spacing: 0.06em;
  color: rgba(236, 237, 241, 0.82);
}

.pnp-matrix {
  position: relative;
  flex: 1;
  min-height: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  background: #050807;
  overflow: hidden;
}
#pnp-matrix {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  image-rendering: pixelated;
}
.pnp-matrix__idle {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  pointer-events: none;
}
.pnp-matrix__idle b {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(236, 237, 241, 0.8);
}
.pnp-matrix__idle span {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.12em;
  color: rgba(236, 237, 241, 0.4);
}
.pnp-matrix__idle[hidden] { display: none; }

.pnp-matrix__status {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 8px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: rgba(236, 237, 241, 0.58);
  text-shadow: 0 1px 5px #000;
  pointer-events: none;
}
.pnp-matrix__status.is-found { color: var(--accent); }
.pnp-matrix__status.is-hypo { color: var(--accent); }

.pnp-progress {
  height: 3px;
  margin-top: 11px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.pnp-progress i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--pnp-teal);
  transition: width 0.1s linear;
}
.pnp-searchbox__foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: rgba(236, 237, 241, 0.46);
}
.pnp-searchbox__foot b { font-weight: 500; color: rgba(236, 237, 241, 0.9); }

/* ------------------------------------------------------------------ 指数墙 */
.pnp-scale { margin-top: clamp(58px, 9vw, 104px); }

.pnp-scale__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
}

.pnp-range { display: block; }
.pnp-range > span {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.pnp-range b { font-size: 24px; font-weight: 500; color: var(--accent); }
.pnp-range input {
  width: 100%;
  margin-top: 14px;
  accent-color: var(--accent);
  cursor: pointer;
}

.pnp-scale__rows {
  margin: 20px 0 0;
  border-top: 1px solid var(--line-soft);
}
.pnp-scale__rows > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
}
.pnp-scale__rows dt {
  font-size: 11.5px;
  color: var(--muted);
}
.pnp-scale__rows dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg);
  text-align: right;
}

.pnp-scale__visual { padding-block: 6px; }
.pnp-scale__bar {
  position: relative;
  height: 14px;
  background: var(--line-soft);
}
.pnp-scale__bar i {
  display: block;
  width: 44%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-soft), var(--accent));
  transition: width 0.15s linear;
}
.pnp-scale__mark {
  position: absolute;
  top: -6px;
  bottom: -6px;
  left: 98.33%;
  width: 1px;
  background: var(--muted);
}
.pnp-scale__mark span {
  position: absolute;
  top: -17px;
  right: 3px;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.05em;
  color: var(--muted);
  white-space: nowrap;
}
.pnp-scale__axis {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  color: var(--muted);
}
.pnp-scale__caption {
  max-width: 38ch;
  margin: 18px 0 0;
  font-size: 11.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* -------------------------------------------------------------- 如果等号成立 */
.pnp-world { margin-top: clamp(58px, 9vw, 104px); }

.pnp-world__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}
.pnp-world__card {
  background: var(--bg);
  padding: clamp(20px, 3vw, 32px);
}
.pnp-world__card--open { border-top: 2px solid var(--accent); }
.pnp-world__card h3 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.pnp-world__card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.pnp-world__card li {
  position: relative;
  padding: 9px 0 9px 17px;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--fg-dim);
}
.pnp-world__card li:last-child { border-bottom: 0; }
.pnp-world__card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}
.pnp-world__card li b { color: var(--fg); font-weight: 500; }
.pnp-world__note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ------------------------------------------------------------------ 边界 */
.pnp-caveats { margin-top: clamp(56px, 8vw, 92px); }
.pnp-caveats ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(24px, 4vw, 56px);
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}
.pnp-caveats li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--fg-dim);
}
.pnp-caveats li b { color: var(--fg); font-weight: 500; }

/* ------------------------------------------------------------------ 方法 */
.pnp-method { margin-top: clamp(48px, 7vw, 78px); }
.pnp-method details {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.pnp-method summary {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
}
.pnp-method summary::-webkit-details-marker { display: none; }
.pnp-method summary::before { content: "+"; display: inline-block; width: 16px; color: var(--accent); }
.pnp-method details[open] summary::before { content: "−"; }
.pnp-method summary:hover { color: var(--fg); }
.pnp-method__body {
  max-width: 880px;
  padding: 16px 0 6px 16px;
}
.pnp-method__body p {
  margin: 0 0 11px;
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--fg-dim);
}
.pnp-method__body code {
  padding: 1px 5px;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  background: var(--bg-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg);
}
.pnp-method__body sup { font-size: 0.72em; }

/* ------------------------------------------------------------------ 页脚 */
.pnp-footer {
  margin-top: clamp(56px, 9vw, 100px);
  border-top: 1px solid var(--line-soft);
}
.pnp-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 24px;
  padding-block: 24px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.pnp-footer__inner a:last-child { margin-left: auto; }
.pnp-footer__inner a:hover { color: var(--fg); }

/* ------------------------------------------------------------------ 响应式 */
@media (max-width: 980px) {
  .pnp-lab__grid { grid-template-columns: 1fr; }
  .pnp-searchbox { min-height: 0; }
  .pnp-scale__grid { grid-template-columns: 1fr; }
  .pnp-world__grid { grid-template-columns: 1fr; }
  .pnp-world__card--open { border-top-width: 2px; }
}

@media (max-width: 820px) {
  .pnp-hero { grid-template-columns: 1fr; gap: 30px; }
  .pnp-formula {
    justify-self: start;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    font-size: clamp(54px, 16vw, 84px);
  }
  .pnp-formula small { left: 2px; bottom: -20px; }
  .pnp-defs { grid-template-columns: 1fr; }
  .pnp-caveats ul { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .pnp-crumb { display: none; }
  .pnp-badge { margin-left: auto; }
  .pnp-hero h1 { font-size: clamp(72px, 22vw, 104px); }
  .pnp-hero__sub { font-size: 18px; letter-spacing: 0.08em; }
  .pnp-target b { font-size: 27px; }
  .pnp-target em { display: none; }
  .pnp-tile { aspect-ratio: 1.35; }
  .pnp-actions .btn { flex: 1 1 auto; }
  .pnp-scale__bar { height: 12px; }
  .pnp-scale__mark span { display: none; }
  .pnp-method__body { padding-left: 6px; }
  .pnp-footer__inner { flex-direction: column; gap: 6px; }
  .pnp-footer__inner a:last-child { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .pnp-formula__q { animation: none; opacity: 0.8; }
  .pnp-tile, .pnp-progress i, .pnp-scale__bar i { transition: none; }
}