/* plein.ikuyu.com 落地页。页面本身做成一张 Plein 画布：点阵底、节点卡片、连线 */

:root {
  --paper: #f3f4f1;
  --dot: #d3d6cf;
  --node: #ffffff;
  --line: #e1e3dd;
  --ink: #1b1e24;
  --mute: #646b76;
  --wire-text: #ec7a67;
  --wire-media: #3cb48a;
  --wire-audio: #5b5de0;
  --mascot: #f5c94a;
  --radius-node: 12px;
  --radius-inner: 7px;
  --gutter: clamp(16px, 4vw, 48px);
  --font:
    -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16181c;
    --dot: #2c3037;
    --node: #1f2228;
    --line: #30343c;
    --ink: #eceef1;
    --mute: #9aa1ac;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--paper);
  background-image: radial-gradient(circle, var(--dot) 1px, transparent 1.3px);
  background-size: 22px 22px;
  color: var(--ink);
  font: 16px/1.7 var(--font);
  -webkit-font-smoothing: antialiased;
}

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--wire-audio);
  outline-offset: 3px;
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* 顶栏 */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

.top nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 28px);
  font-size: 15px;
}

.top nav a {
  text-decoration: none;
  color: var(--mute);
}

.top nav a:hover {
  color: var(--ink);
}

/* 首屏 */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  align-items: center;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(24px, 6vw, 72px) clamp(48px, 8vw, 104px);
}

.hero h1 {
  margin: 0;
  font-size: clamp(38px, 5.6vw, 76px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero h1:lang(en) {
  font-size: clamp(36px, 4.6vw, 64px);
}

.hero h1 span {
  display: block;
  white-space: nowrap;
}

.lead {
  max-width: 30em;
  margin: 28px 0 0;
  font-size: clamp(17px, 1.5vw, 19px);
  color: var(--mute);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 10px;
  border: 1.5px solid var(--ink);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--ink) 86%, var(--paper));
}

.btn-ghost {
  background: var(--node);
}

.btn-ghost:hover {
  background: var(--paper);
}

.note {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--mute);
}

/* 首屏画布：坐标系 640 × 650，节点和连线都按同一比例缩放 */

.board {
  position: relative;
  margin: 0;
  aspect-ratio: 640 / 650;
  container-type: inline-size;
}

.board .wires {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.wires path {
  fill: none;
  stroke-width: 2.4;
  stroke-linecap: round;
}

.node {
  position: absolute;
  background: var(--node);
  border: 1px solid var(--line);
  border-radius: var(--radius-node);
  box-shadow:
    0 1px 0 var(--line),
    0 14px 30px -18px rgb(20 24 32 / 35%);
  font-size: clamp(10px, 2.05cqw, 13.5px);
  line-height: 1.6;
}

.node-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.7em 0.9em 0.5em;
  font-size: 0.92em;
  font-weight: 600;
  color: var(--mute);
}

.node-head i {
  width: 0.62em;
  height: 0.62em;
  border-radius: 2px;
  background: currentColor;
}

.node-body {
  padding: 0 0.9em 0.9em;
}

.node .port {
  position: absolute;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -5.5px;
  border-radius: 50%;
  background: var(--node);
  border: 2.4px solid currentColor;
}

.port.out {
  right: -6px;
}

.port.in {
  left: -6px;
}

.t-text {
  color: var(--wire-text);
}

.t-media {
  color: var(--wire-media);
}

.t-audio {
  color: var(--wire-audio);
}

.node-body p {
  margin: 0;
  color: var(--ink);
}

.node-body img {
  width: 100%;
  border-radius: var(--radius-inner);
}

.n-script {
  left: 0;
  top: 0;
  width: 39%;
}

.n-script p + p {
  margin-top: 0.4em;
}

.n-character {
  left: 3%;
  top: 26.5%;
  width: 40.5%;
}

.n-shots {
  left: 0;
  top: 57%;
  width: 41%;
}

.shots3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45em;
}

.n-voice {
  left: 6%;
  top: 88.5%;
  width: 35%;
}

.n-voice svg {
  display: block;
  width: 100%;
  height: 2.6em;
  color: var(--wire-audio);
}

.n-final {
  right: 0;
  top: 7%;
  width: 41%;
}

.n-final .player {
  position: relative;
}

.n-final video {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  border-radius: var(--radius-inner);
  background: #000;
}

.sound {
  position: absolute;
  right: 0.7em;
  bottom: 0.7em;
  padding: 0.35em 0.8em;
  border: 0;
  border-radius: 99px;
  background: rgb(0 0 0 / 55%);
  color: #fff;
  font: inherit;
  font-size: 0.95em;
  cursor: pointer;
  backdrop-filter: blur(6px);
}

.sound:hover {
  background: rgb(0 0 0 / 75%);
}

/* 首屏唯一的动效：连线依次画出来 */

@media (prefers-reduced-motion: no-preference) {
  .wires path {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    animation: draw 0.9s cubic-bezier(0.6, 0, 0.2, 1) forwards;
  }

  .wires path:nth-child(2) {
    animation-delay: 0.15s;
  }

  .wires path:nth-child(3) {
    animation-delay: 0.3s;
  }

  .wires path:nth-child(4) {
    animation-delay: 0.45s;
  }

  @keyframes draw {
    to {
      stroke-dashoffset: 0;
    }
  }
}

/* 通用小节 */

section {
  padding-block: clamp(56px, 8vw, 112px);
}

h2 {
  margin: 0;
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.sub {
  max-width: 36em;
  margin: 16px 0 0;
  color: var(--mute);
  font-size: 17px;
}

/* 样片流程：一条可以横向拖动的节点链 */

.chain {
  display: flex;
  margin-bottom: 0;
  list-style: none;
  align-items: flex-start;
  gap: 44px;
  margin-top: 48px;
  /* 首个节点与上方正文左对齐，滚动时可以一直拖到屏幕边缘 */
  --edge: max(var(--gutter), (100% - 1200px) / 2 + var(--gutter));
  padding: 8px var(--edge) 28px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scroll-padding-inline: var(--edge);
  scrollbar-width: thin;
}

.step {
  position: relative;
  flex: none;
  scroll-snap-align: start;
  background: var(--node);
  border: 1px solid var(--line);
  border-radius: var(--radius-node);
  box-shadow: 0 1px 0 var(--line);
  font-size: 14.5px;
  line-height: 1.65;
}

/* 节点之间的连线 */
.step + .step::before {
  content: "";
  position: absolute;
  top: 34px;
  left: -45px;
  width: 44px;
  border-top: 2.4px solid var(--wire, var(--wire-media));
}

.step header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--line);
}

.step header b {
  font-size: 16px;
}

.step header span {
  font-size: 13px;
  color: var(--mute);
}

.step .body {
  padding: 14px 16px 16px;
}

.step .body p {
  margin: 0;
}

.step .body img {
  border-radius: var(--radius-inner);
}

.step-idea,
.step-script {
  width: 250px;
  --wire: var(--wire-text);
}

.step-script .body p + p {
  margin-top: 8px;
}

.step-script em {
  font-style: normal;
  font-weight: 700;
}

.step-cards {
  width: 400px;
  --wire: var(--wire-text);
}

.cards2 {
  display: grid;
  grid-template-columns: 1fr 0.42fr;
  gap: 10px;
  align-items: start;
}

.step-board {
  width: 290px;
  --wire: var(--wire-text);
}

.step-board table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.step-board th,
.step-board td {
  padding: 6px 4px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.step-board th {
  font-weight: 600;
  color: var(--mute);
}

.step-board td:last-child {
  white-space: nowrap;
  color: var(--mute);
}

.step-shots {
  width: 470px;
  --wire: var(--wire-media);
}

.shots6 {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
}

.step-voice {
  width: 260px;
  --wire: var(--wire-media);
}

.step-voice svg {
  display: block;
  width: 100%;
  height: 44px;
  color: var(--wire-audio);
}

.step-voice .line {
  margin-top: 10px;
}

.step-final {
  width: 200px;
  --wire: var(--wire-audio);
}

.chain-note {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--mute);
}

/* 理由：两栏的定义列表 */

.reasons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px clamp(32px, 5vw, 80px);
  margin: 48px 0 0;
}

.reasons div {
  padding-left: 18px;
  border-left: 2.4px solid var(--wire);
}

.reasons dt {
  font-size: 19px;
  font-weight: 700;
}

.reasons dd {
  margin: 8px 0 0;
  color: var(--mute);
  max-width: 32em;
}

.platforms {
  margin: 48px 0 0;
  font-size: 15px;
  color: var(--mute);
}

.platforms strong {
  color: var(--ink);
  font-weight: 600;
}

/* 下载 */

.get {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.get > div {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 24px;
  background: var(--node);
  border: 1px solid var(--line);
  border-radius: var(--radius-node);
}

.get h3 {
  margin: 0;
  font-size: 19px;
}

.get p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
}

.get .btn {
  margin-top: auto;
}

.cmd {
  display: flex;
  align-items: stretch;
  width: 100%;
  margin-top: auto;
  border: 1px solid var(--line);
  border-radius: 9px;
  overflow: hidden;
}

.cmd pre {
  flex: 1;
  margin: 0;
  min-width: 0;
  padding: 10px 12px;
  overflow-x: auto;
  font: 13px/1.6 var(--mono);
  white-space: pre;
  background: var(--paper);
}

.cmd button {
  flex: none;
  padding: 0 14px;
  border: 0;
  border-left: 1px solid var(--line);
  background: var(--node);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.cmd button:hover {
  background: var(--paper);
}

footer {
  padding-block: 40px 56px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--mute);
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
}

footer p {
  margin: 0;
}

footer a + a {
  margin-left: 16px;
}

/* 窄屏 */

@media (max-width: 960px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .board {
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
  }

  .get {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  /* 节点太小读不清，只留成片 */
  .board {
    aspect-ratio: auto;
    max-width: 300px;
  }

  .board .wires,
  .n-script,
  .n-character,
  .n-shots,
  .n-voice {
    display: none;
  }

  .n-final {
    position: relative;
    top: auto;
    width: 100%;
    font-size: 14px;
  }

  .n-final .port {
    display: none;
  }

  .reasons {
    grid-template-columns: 1fr;
  }

  .top nav .hide-sm {
    display: none;
  }
}