/* ============================================================
   Pisper 宣传页设计系统
   粒子场是整页背景,内容以暗色玻璃浮于其上
   ============================================================ */

:root {
  --bg: #0b0c0c;
  --panel: rgba(17, 19, 18, 0.66);
  --panel-strong: rgba(17, 19, 18, 0.85);
  --line: rgba(242, 244, 240, 0.09);
  --ink: #f2f4f0;
  --dim: rgba(242, 244, 240, 0.62);
  --faint: rgba(242, 244, 240, 0.4);
  --lime: #dfff62;
  --lime-dim: rgba(223, 255, 98, 0.16);
  --cyan: #62d1dc;
  --purple: #a855f7;
  --radius: 18px;
  --shell: 1160px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  /* 粒子画布失效时,这层渐变就是兜底背景 */
  background:
    radial-gradient(900px 600px at 85% 10%, rgba(168, 85, 247, 0.1), transparent 65%),
    radial-gradient(800px 560px at 8% 90%, rgba(98, 209, 220, 0.08), transparent 70%),
    radial-gradient(700px 500px at 60% 55%, rgba(223, 255, 98, 0.05), transparent 70%),
    var(--bg);
  color: var(--ink);
  font-family:
    "Avenir Next", "Helvetica Neue", Helvetica, Arial, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  overflow-x: clip;
}

::selection {
  background: var(--lime);
  color: #111312;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

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

a {
  color: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: -4rem;
  left: 1rem;
  z-index: 100;
  background: var(--ink);
  color: #111312;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 1rem;
}

/* ============================================================
   粒子画布与可读性纱罩
   ============================================================ */

#field {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* 顶部与底部轻微压暗,保证导航与页脚可读;中部尽量透明,把舞台留给粒子 */
.veil {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(11, 12, 12, 0.72) 0%,
    rgba(11, 12, 12, 0) 16%,
    rgba(11, 12, 12, 0) 74%,
    rgba(11, 12, 12, 0.82) 100%
  );
}

body.no-field #field {
  display: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--lime), var(--cyan));
  pointer-events: none;
}

/* ============================================================
   布局壳
   ============================================================ */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 24px;
}

main,
.site-footer {
  position: relative;
  z-index: 2;
}

/* ============================================================
   顶部导航
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  transition:
    background 0.35s,
    border-color 0.35s,
    backdrop-filter 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(11, 12, 12, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--line);
}

.nav {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
}

.brand img {
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 26px;
}

.nav-links a {
  color: var(--dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.25s;
}

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

.nav-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid rgba(223, 255, 98, 0.45);
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 600;
  transition:
    background 0.25s,
    color 0.25s,
    border-color 0.25s;
}

.nav-download:hover {
  background: var(--lime);
  border-color: var(--lime);
  color: #111312;
}

/* ============================================================
   Hero:内容居左下,右侧留给粒子字
   ============================================================ */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: 120px;
  padding-bottom: 9vh;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--lime);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.34em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(64px, 10vw, 118px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.hero-statement {
  margin: 18px 0 0;
  font-size: clamp(22px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.gradient-text {
  background: linear-gradient(100deg, var(--lime) 10%, var(--cyan) 60%, var(--purple) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-copy {
  margin: 20px 0 0;
  max-width: 560px;
  color: var(--dim);
  font-size: 16.5px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero-meta {
  margin: 26px 0 0;
  color: var(--faint);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.hero-hint {
  position: absolute;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  color: var(--faint);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  white-space: nowrap;
}

.hero-hint i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--faint);
}

/* ============================================================
   按钮
   ============================================================ */

.button {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  overflow: hidden;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s,
    background 0.25s,
    color 0.25s,
    border-color 0.25s;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--lime);
  color: #111312;
  box-shadow: 0 8px 32px rgba(223, 255, 98, 0.22);
}

.button-primary:hover {
  box-shadow: 0 12px 42px rgba(223, 255, 98, 0.32);
}

.button-secondary {
  border: 1px solid var(--line);
  color: var(--ink);
  background: rgba(17, 19, 18, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.button-secondary:hover {
  border-color: rgba(242, 244, 240, 0.3);
  background: rgba(242, 244, 240, 0.08);
}

/* 光泽扫过:仅在主按钮上,克制一点 */
.shiny::after {
  content: "";
  position: absolute;
  top: 0;
  left: -80%;
  width: 55%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  transform: skewX(-18deg);
  animation: shiny-sweep 4.2s ease-in-out infinite;
}

@keyframes shiny-sweep {
  0%,
  62% {
    left: -80%;
  }
  88%,
  100% {
    left: 130%;
  }
}

.magnetic {
  transition: transform 0.2s var(--ease);
  will-change: transform;
}

/* ============================================================
   通用区块
   ============================================================ */

.section {
  padding-block: clamp(90px, 12vh, 140px);
}

.section-heading {
  max-width: 700px;
  margin-bottom: clamp(36px, 5vh, 56px);
}

.section-heading h2 {
  margin: 0 0 16px;
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.section-heading p:not(.eyebrow) {
  margin: 0;
  color: var(--dim);
  font-size: 16.5px;
  line-height: 1.85;
}

/* 玻璃卡片通用质感 */
.signal-grid > div,
.product-panel,
.capability-list li,
.safety-local,
.safety-list li,
.safety-boundary,
.component-rows > div,
.mobile-points li,
.terminal-figure,
.download-inner,
.terminal-install {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* ============================================================
   产品形态条
   ============================================================ */

.signal-band {
  padding-top: 2vh;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.signal-grid > div {
  padding: 22px 24px;
}

.signal-grid strong {
  display: block;
  font-size: 19px;
  margin-bottom: 6px;
}

.signal-grid span {
  color: var(--dim);
  font-size: 13.5px;
}

/* ============================================================
   界面:标签页 + 截图面板
   ============================================================ */

.product-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.product-tabs [role="tab"] {
  appearance: none;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(17, 19, 18, 0.55);
  color: var(--dim);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  transition:
    background 0.25s,
    color 0.25s,
    border-color 0.25s;
}

.product-tabs [role="tab"]:hover {
  color: var(--ink);
  border-color: rgba(242, 244, 240, 0.28);
}

.product-tabs [role="tab"][aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: #111312;
  font-weight: 700;
}

.product-panel {
  margin: 0;
  padding: 14px;
}

.product-shot-wrap {
  overflow: hidden;
  border-radius: 12px;
  transform: perspective(1200px) rotateX(var(--tilt-x, 0deg)) rotateY(var(--tilt-y, 0deg));
  transition: transform 0.35s var(--ease);
}

.product-shot {
  width: 100%;
  border-radius: 12px;
  transition: opacity 0.3s;
}

.product-shot.is-changing {
  opacity: 0.25;
}

.product-panel figcaption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding: 18px 8px 8px;
}

.product-panel figcaption strong {
  font-size: 19px;
}

.product-panel figcaption span {
  color: var(--dim);
  font-size: 14.5px;
}

/* ============================================================
   能力列表
   ============================================================ */

.capability-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.capability-list li {
  display: flex;
  gap: 20px;
  padding: 26px 28px;
}

.capability-list li > span {
  color: var(--lime);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  padding-top: 3px;
}

.capability-list h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

.capability-list p {
  margin: 0;
  color: var(--dim);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ============================================================
   数据安全
   ============================================================ */

.safety-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
  align-items: start;
}

.safety-local {
  padding: 30px;
  position: sticky;
  top: 96px;
}

.safety-local p {
  margin: 0 0 16px;
  color: var(--faint);
  font-size: 11.5px;
  letter-spacing: 0.28em;
}

.safety-local > code {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--lime-dim);
  border: 1px solid rgba(223, 255, 98, 0.3);
  color: var(--lime);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 16px;
}

.safety-local span {
  display: block;
  margin-top: 16px;
  color: var(--dim);
  font-size: 13.5px;
}

.safety-local span code,
.terminal-copy code {
  color: var(--cyan);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.safety-local small {
  display: block;
  margin-top: 10px;
  color: var(--faint);
  font-size: 12.5px;
  line-height: 1.7;
}

.safety-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.safety-list li {
  display: flex;
  gap: 18px;
  padding: 22px 26px;
}

.safety-list li > span {
  color: var(--cyan);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13.5px;
  padding-top: 2px;
}

.safety-list h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.safety-list p {
  margin: 0;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.75;
}

.safety-boundary {
  margin-top: 18px;
  padding: 22px 26px;
  border-style: dashed;
  border-color: rgba(168, 85, 247, 0.4);
}

.safety-boundary strong {
  color: var(--purple);
  font-size: 14px;
  letter-spacing: 0.1em;
}

.safety-boundary p {
  margin: 10px 0 0;
  color: var(--dim);
  font-size: 13.5px;
  line-height: 1.8;
}

/* ============================================================
   组件更新
   ============================================================ */

.component-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(30px, 5vw, 70px);
  align-items: center;
}

.component-intro h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 3.8vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.component-intro p:not(.eyebrow) {
  margin: 0;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.85;
}

.component-rows {
  display: grid;
  gap: 14px;
}

.component-rows > div {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 22px 26px;
}

.component-rows span {
  color: var(--lime);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

.component-rows strong {
  font-size: 17px;
}

.component-rows p {
  margin: 0;
  color: var(--dim);
  font-size: 14px;
  text-align: right;
}

/* ============================================================
   终端
   ============================================================ */

.terminal-section {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

.terminal-copy h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 3.8vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.terminal-copy p:not(.eyebrow) {
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.85;
}

.terminal-install {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 12px 12px 12px 20px;
  margin: 8px 0 6px;
}

.terminal-install > code {
  color: var(--lime);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 15.5px;
}

.terminal-copy-button {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--dim);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition:
    background 0.25s,
    color 0.25s,
    border-color 0.25s;
}

.terminal-copy-button:hover {
  background: var(--lime);
  border-color: var(--lime);
  color: #111312;
}

.terminal-copy-button.is-copied {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #111312;
}

.text-link {
  display: inline-flex;
  gap: 8px;
  margin-top: 14px;
  color: var(--cyan);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 600;
}

.text-link:hover {
  text-decoration: underline;
}

.terminal-gallery {
  display: grid;
  gap: 18px;
}

.terminal-figure {
  margin: 0;
  padding: 10px;
}

.terminal-figure a {
  display: block;
  overflow: hidden;
  border-radius: 10px;
}

.terminal-figure img {
  width: 100%;
  border-radius: 10px;
  transition: transform 0.5s var(--ease);
}

.terminal-figure a:hover img {
  transform: scale(1.02);
}

.terminal-figure figcaption {
  padding: 12px 6px 4px;
  color: var(--faint);
  font-size: 13px;
}

/* 移动端版块：手机截图限宽居中，配对要点复用编号行风格 */
.mobile-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.mobile-points li {
  display: flex;
  gap: 16px;
  padding: 16px 18px;
}

.mobile-points li > span {
  color: var(--lime);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  padding-top: 2px;
}

.mobile-points h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.mobile-points p {
  margin: 0;
  color: var(--dim);
  font-size: 13px;
  line-height: 1.7;
}

.phone-figure {
  max-width: 300px;
  justify-self: center;
}

.phone-figure img {
  border-radius: 18px;
}

/* ============================================================
   下载
   ============================================================ */

.download-section {
  padding-block: clamp(60px, 8vh, 110px) clamp(90px, 12vh, 140px);
}

.download-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: clamp(36px, 5vw, 60px);
  background: var(--panel-strong);
}

.download-inner h2 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.download-inner p:not(.eyebrow) {
  margin: 0;
  color: var(--dim);
  font-size: 15.5px;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================================
   页脚
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 56px;
  background: rgba(11, 12, 12, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-brand {
  font-size: 15.5px;
}

.footer-inner p {
  margin: 0;
  color: var(--faint);
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 22px;
}

.footer-links a {
  color: var(--dim);
  text-decoration: none;
  font-size: 13.5px;
  transition: color 0.25s;
}

.footer-links a:hover {
  color: var(--ink);
}

/* ============================================================
   入场动效
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.85s var(--ease),
    transform 0.85s var(--ease);
  transition-delay: var(--d, 0ms);
}

.reveal.in-view {
  opacity: 1;
  transform: none;
}

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 960px) {
  .nav-links {
    display: none;
  }

  .signal-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .capability-list,
  .safety-layout,
  .component-layout,
  .terminal-section {
    grid-template-columns: 1fr;
  }

  .safety-local {
    position: static;
  }

  .component-rows p {
    text-align: left;
  }

  .component-rows > div {
    grid-template-columns: auto auto;
  }

  .component-rows p {
    grid-column: 2;
  }
}

@media (max-width: 620px) {
  .hero {
    padding-bottom: 14vh;
  }

  .hero-hint {
    display: none;
  }

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

  .capability-list li,
  .safety-list li {
    padding: 20px;
    gap: 14px;
  }

  .download-inner {
    padding: 30px 24px;
  }

  .button {
    padding: 13px 22px;
    font-size: 14px;
  }
}

/* ============================================================
   减弱动态
   ============================================================ */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}