/* AI-WPS overview — Apple-style product page
   Motion: critically damped; interruptible; reduced-motion / transparency / contrast. */

:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --bg-elevated: #ffffff;
  --bg-wash: #fbfbfd;
  --ink: #1d1d1f;
  --secondary: #6e6e73;
  --tertiary: #86868b;
  --fill: rgba(0, 0, 0, 0.04);
  --fill-strong: rgba(0, 0, 0, 0.08);
  --hairline: rgba(0, 0, 0, 0.08);
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --blue-press: #006edb;
  --green: #248a3d;
  --nav-bg: rgba(251, 251, 253, 0.72);
  --nav-h: 52px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.1);
  --radius-l: 22px;
  --radius-m: 14px;
  --radius-s: 10px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei",
    system-ui, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, "Cascadia Code", Consolas, monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --content: 1080px;
  --section-y: clamp(4.5rem, 8vw, 7.5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1d1d1f;
    --bg-wash: #161617;
    --ink: #f5f5f7;
    --secondary: #a1a1a6;
    --tertiary: #86868b;
    --fill: rgba(255, 255, 255, 0.06);
    --fill-strong: rgba(255, 255, 255, 0.1);
    --hairline: rgba(255, 255, 255, 0.12);
    --nav-bg: rgba(22, 22, 23, 0.72);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.55);
    --blue: #2997ff;
    --blue-hover: #40a3ff;
    --blue-press: #1480eb;
    --green: #32d74b;
  }
}

@media (prefers-contrast: more) {
  :root {
    --nav-bg: var(--bg-elevated);
    --hairline: currentColor;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font: 17px/1.47 var(--font);
  font-optical-sizing: auto;
  letter-spacing: -0.011em;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

[lang="zh-CN"] body,
html[lang="zh-CN"] {
  line-height: 1.55;
  letter-spacing: 0;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 80;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--bg);
  border-radius: 8px;
  text-decoration: none;
}
.skip:focus {
  top: 12px;
}

a {
  color: var(--blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

code,
kbd {
  font-family: var(--mono);
  font-size: 0.86em;
  letter-spacing: 0;
}

/* ——— Nav: translucent material, content scrolls under ——— */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 0 22px;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}

.nav::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -12px;
  height: 12px;
  pointer-events: none;
  background: linear-gradient(to bottom, var(--bg), transparent);
  opacity: 0.55;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.03em;
  text-decoration: none;
  flex-shrink: 0;
}
.wordmark:hover {
  text-decoration: none;
  opacity: 0.72;
}
.wordmark .mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(180deg, #3a3a3c 0%, #1d1d1f 100%);
  color: #f5f5f7;
  display: grid;
  place-items: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: -0.04em;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}
@media (prefers-color-scheme: dark) {
  .wordmark .mark {
    background: linear-gradient(180deg, #5a5a5e 0%, #2c2c2e 100%);
  }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.nav-links::-webkit-scrollbar {
  display: none;
}
.nav-links a {
  color: var(--ink);
  font-size: 12px;
  line-height: 1.33;
  letter-spacing: -0.01em;
  opacity: 0.8;
  white-space: nowrap;
  padding: 10px 0;
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a.is-active {
  opacity: 1;
  text-decoration: none;
}

.nav-end {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-left: auto;
}

.lang {
  display: flex;
  padding: 2px;
  border-radius: 999px;
  background: var(--fill-strong);
}
.lang a {
  min-width: 44px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--secondary);
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  padding: 0 10px;
}
.lang a.is-active {
  background: var(--bg-elevated);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}
.lang a:hover {
  text-decoration: none;
}
.lang a:active {
  transform: scale(0.97);
  transition: transform 100ms ease-out;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 18px;
  border-radius: 980px;
  background: var(--blue);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  transition: transform 100ms ease-out, background 120ms ease-out;
}
.btn:hover {
  background: var(--blue-hover);
  text-decoration: none;
}
.btn:active {
  background: var(--blue-press);
  transform: scale(0.97);
}
.btn-ghost {
  background: var(--fill-strong);
  color: var(--ink);
}
.btn-ghost:hover {
  background: var(--fill);
}
.btn-small {
  height: 28px;
  padding: 0 12px;
  font-size: 12px;
}

main {
  overflow: hidden;
}

.wrap {
  width: min(var(--content), calc(100% - 40px));
  margin: 0 auto;
}

/* ——— Hero ——— */
.hero {
  padding: clamp(3.2rem, 7vw, 6.2rem) 0 3.2rem;
  text-align: center;
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% 10% auto;
  height: 420px;
  background: radial-gradient(
    ellipse at 50% 0%,
    rgba(0, 113, 227, 0.1),
    transparent 62%
  );
  pointer-events: none;
}
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--secondary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.kicker .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(36, 138, 61, 0.18);
}
@media (prefers-color-scheme: dark) {
  .kicker .dot {
    box-shadow: 0 0 0 4px rgba(50, 215, 75, 0.22);
  }
}

.hero h1 {
  margin: 0 auto;
  max-width: 16ch;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.028em;
  font-weight: 600;
  font-optical-sizing: auto;
}
html[lang="zh-CN"] .hero h1 {
  max-width: 12em;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.lede {
  margin: 18px auto 0;
  max-width: 38em;
  color: var(--secondary);
  font-size: clamp(1.05rem, 1.6vw, 1.32rem);
  line-height: 1.45;
  letter-spacing: 0.004em;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.pills {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}
.pill {
  height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--fill);
  color: var(--secondary);
  font-size: 12px;
  line-height: 28px;
  letter-spacing: -0.01em;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 56px;
  background: var(--hairline);
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.stat {
  background: var(--bg-elevated);
  padding: 22px 18px 20px;
  text-align: left;
}
.stat b {
  display: block;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  font-weight: 600;
  line-height: 1.15;
}
.stat span {
  display: block;
  margin-top: 4px;
  color: var(--secondary);
  font-size: 12px;
  line-height: 1.35;
}

/* ——— Sections ——— */
section.block {
  padding: var(--section-y) 0 0;
}
section.block:last-of-type {
  padding-bottom: var(--section-y);
}

.section-head {
  max-width: 22em;
  margin-bottom: 36px;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 600;
}
html[lang="zh-CN"] .section-head h2 {
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.section-head p {
  margin: 10px 0 0;
  color: var(--secondary);
  font-size: 17px;
}

/* ——— Feature hosts ——— */
.hosts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.host {
  background: var(--bg-elevated);
  border-radius: var(--radius-l);
  padding: 26px 24px 10px;
  box-shadow: var(--shadow);
  min-width: 0;
}
.host header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}
.host h3 {
  margin: 0;
  font-size: 21px;
  letter-spacing: -0.02em;
  font-weight: 600;
}
.host .count {
  color: var(--tertiary);
  font-size: 12px;
}
.feature {
  padding: 16px 0;
  border-top: 1px solid var(--hairline);
}
.feature:first-of-type {
  border-top: 0;
}
.feature h4 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.feature p {
  margin: 0;
  color: var(--secondary);
  font-size: 13.5px;
  line-height: 1.45;
}
.tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  color: var(--tertiary);
  letter-spacing: 0.01em;
}

.note {
  margin-top: 18px;
  color: var(--secondary);
  font-size: 14px;
  line-height: 1.5;
}

/* ——— Architecture pipeline ——— */
.pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  position: relative;
}
.pipe {
  background: var(--bg-elevated);
  border-radius: var(--radius-m);
  padding: 20px 18px 18px;
  box-shadow: var(--shadow);
  position: relative;
}
.pipe:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -9px;
  top: 42px;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--tertiary);
  border-top: 1.5px solid var(--tertiary);
  transform: rotate(45deg);
  pointer-events: none;
}
.pipe .n {
  display: block;
  font-size: 12px;
  color: var(--blue);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.pipe strong {
  display: block;
  font-size: 16px;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.pipe p {
  margin: 0;
  color: var(--secondary);
  font-size: 13px;
  line-height: 1.4;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 16px;
}
.principle {
  padding: 20px 22px;
  border-radius: var(--radius-m);
  background: var(--fill);
}
.principle strong {
  display: block;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}
.principle p {
  margin: 0;
  color: var(--secondary);
  font-size: 14px;
}

/* ——— Releases ——— */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.release {
  display: grid;
  grid-template-columns: 168px 1fr;
  gap: 24px;
  padding: 22px 24px;
  background: var(--bg-elevated);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow);
}
.release.current {
  box-shadow: var(--shadow), 0 0 0 1px var(--blue);
}
.release .meta .ver {
  display: block;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-size: 17px;
}
.release .meta time,
.release .meta .status {
  display: block;
  color: var(--secondary);
  font-size: 12px;
  margin-top: 4px;
}
.release ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.release li {
  position: relative;
  padding-left: 14px;
  color: var(--secondary);
  font-size: 14.5px;
  line-height: 1.5;
  margin: 0 0 4px;
}
.release li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
}

.identity {
  margin-top: 14px;
  font-size: 13px;
  color: var(--tertiary);
}
.identity a {
  color: var(--secondary);
}

/* ——— Install ——— */
.tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  width: fit-content;
  background: var(--fill-strong);
  border-radius: 12px;
  margin-bottom: 18px;
}
.tabs button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--secondary);
  height: 34px;
  padding: 0 14px;
  border-radius: 9px;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}
.tabs button[aria-selected="true"] {
  background: var(--bg-elevated);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}
.tabs button:active {
  transform: scale(0.97);
  transition: transform 100ms ease-out;
}

.panel[hidden] {
  display: none;
}

.steps {
  display: grid;
  gap: 12px;
}
.step {
  background: var(--bg-elevated);
  border-radius: var(--radius-l);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}
.step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -0.02em;
}
.step p {
  margin: 0 0 12px;
  color: var(--secondary);
  font-size: 14.5px;
}
.step .n {
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 6px;
}

pre {
  margin: 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: #1d1d1f;
  color: #f5f5f7;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  letter-spacing: 0;
  -webkit-overflow-scrolling: touch;
}
@media (prefers-color-scheme: light) {
  pre {
    background: #1d1d1f;
  }
}

.cmd-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 12px;
}
.cmd-table th,
.cmd-table td {
  text-align: left;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
.cmd-table th {
  color: var(--tertiary);
  font-weight: 500;
  font-size: 12px;
}
.cmd-table td:first-child {
  width: 52%;
  padding-right: 16px;
}

/* ——— Develop ——— */
.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
}
.card {
  background: var(--bg-elevated);
  border-radius: var(--radius-l);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 14px;
  font-size: 17px;
  letter-spacing: -0.02em;
}
.map {
  list-style: none;
  margin: 0;
  padding: 0;
}
.map li {
  display: grid;
  grid-template-columns: 168px 1fr;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--hairline);
  font-size: 14px;
}
.map li:first-child {
  border-top: 0;
}
.map code {
  color: var(--ink);
}
.map span {
  color: var(--secondary);
}

.docs {
  display: grid;
  gap: 8px;
}
.docs a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--hairline);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
}
.docs a:first-child {
  border-top: 0;
}
.docs a:hover {
  color: var(--blue);
}
.docs a small {
  color: var(--tertiary);
  font-size: 12px;
}

/* ——— Footer ——— */
footer {
  margin-top: var(--section-y);
  padding: 28px 0 48px;
  color: var(--tertiary);
  font-size: 12px;
  line-height: 1.5;
}
footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 22px;
  border-top: 1px solid var(--hairline);
}
footer a {
  color: var(--secondary);
}

/* ——— Reveal (non-gesture; critically damped settle) ——— */
.reveal {
  animation: rise 0.7s var(--ease-out) both;
}
.d1 {
  animation-delay: 60ms;
}
.d2 {
  animation-delay: 140ms;
}
.d3 {
  animation-delay: 220ms;
}
.d4 {
  animation-delay: 300ms;
}
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .btn,
  .lang a,
  .tabs button {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
  .reveal {
    opacity: 1;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .nav {
    background: var(--bg-elevated);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .nav::after {
    display: none;
  }
}

@media (max-width: 980px) {
  .stats,
  .hosts,
  .pipeline,
  .principles,
  .split {
    grid-template-columns: 1fr;
  }
  .release {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .map li {
    grid-template-columns: 1fr;
    gap: 2px;
  }
  .nav {
    height: auto;
    min-height: var(--nav-h);
    flex-wrap: wrap;
    gap: 8px 14px;
    padding: 8px 14px 6px;
  }
  .nav-links {
    order: 3;
    flex-basis: 100%;
    padding-bottom: 4px;
  }
  .hero h1 {
    max-width: none;
  }
  .pipe:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .stats {
    grid-template-columns: 1fr 1fr;
  }
  .cmd-table td:first-child {
    width: auto;
  }
}