/* ============================================================
   DispMini — product site
   Art-directed dark theme. Single committed look (no OS theme
   switch): this is a product about a glowing screen, and the
   dark ground is what makes the hardware render read.
   ============================================================ */

:root {
  --bg: #08080b;
  --bg-2: #0d0d12;
  --surface: rgba(255, 255, 255, 0.028);
  --surface-2: rgba(255, 255, 255, 0.045);
  --line: rgba(255, 255, 255, 0.075);
  --line-2: rgba(255, 255, 255, 0.13);

  --text: #f4f2ee;
  --text-2: #a8a49c;
  --text-3: #6f6b64;

  --amber: #e9a765;
  --amber-hot: #ffbe7a;
  --blue: #6fb6e6;
  --blue-hot: #9ad2f7;

  --r-lg: 22px;
  --r-md: 16px;
  --r-sm: 10px;

  --maxw: 1140px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  /* 系统字体，不再加载 Google Fonts 的 Inter（2026-10-26）：访客基本都是 Mac，
     SF Pro 跟 Inter 观感几乎一样；省掉两个阻塞渲染的第三方请求，也不把访客 IP
     交给 Google——跟页面上"不经过任何服务器"的隐私口径一致。 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* language switching -------------------------------------- */
html.lang-zh .en { display: none; }
html.lang-en .zh { display: none; }
html:not(.lang-en) .en { display: none; }

/* ambient background -------------------------------------- */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}
.orb-a {
  width: 780px; height: 780px;
  top: -320px; left: 50%;
  margin-left: -520px;
  background: radial-gradient(circle, rgba(233, 167, 101, 0.22), transparent 68%);
}
.orb-b {
  width: 720px; height: 720px;
  top: -180px; left: 50%;
  margin-left: -40px;
  background: radial-gradient(circle, rgba(90, 150, 210, 0.2), transparent 68%);
}
.orb-c {
  width: 900px; height: 620px;
  top: 1500px; left: 50%;
  margin-left: -450px;
  background: radial-gradient(circle, rgba(233, 167, 101, 0.09), transparent 70%);
}
.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.16;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

.page { position: relative; z-index: 2; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* nav ------------------------------------------------------ */
.nav {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: 14px 0;
  background: linear-gradient(to bottom, rgba(8, 8, 11, 0.9), rgba(8, 8, 11, 0));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 650;
  font-size: 16.5px;
  letter-spacing: -0.015em;
}
.brand .mark {
  width: 30px; height: 30px;
  border-radius: 9px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.03);
}
.nav-links a {
  padding: 7px 15px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, 0.06); }

.lang-toggle {
  font-family: inherit;
  cursor: pointer;
  padding: 7px 15px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.02em;
  color: var(--text);
  background: rgba(255, 255, 255, 0.09);
  border: none;
  transition: background 0.2s var(--ease);
}
.lang-toggle:hover { background: rgba(255, 255, 255, 0.16); }

@media (max-width: 860px) {
  .nav-links a:not(.keep) { display: none; }
  .nav-links { border: none; background: none; padding: 0; }
}

/* buttons -------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 26px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 620;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  color: #17130d;
  background: linear-gradient(180deg, var(--amber-hot), var(--amber));
  box-shadow: 0 8px 30px rgba(233, 167, 101, 0.24);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(233, 167, 101, 0.34);
}
.btn-ghost {
  color: var(--text);
  border-color: var(--line-2);
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.28); background: rgba(255, 255, 255, 0.07); }

/* hero ----------------------------------------------------- */
.hero { padding: 76px 0 40px; text-align: center; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 12px;
  border-radius: 100px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
  font-size: 13px;
  font-weight: 520;
  color: var(--text-2);
  margin-bottom: 30px;
}
.badge .pip {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(233, 167, 101, 0.18);
}

h1 {
  margin: 0 0 24px;
  font-size: clamp(38px, 6.6vw, 74px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 680;
  text-wrap: balance;
}
h1 .grad {
  background: linear-gradient(100deg, var(--amber-hot) 8%, var(--blue-hot) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
html.lang-zh h1 { letter-spacing: -0.02em; font-weight: 700; }

.hero-sub {
  max-width: 610px;
  margin: 0 auto 38px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-2);
}

.cta-row {
  display: flex;
  justify-content: center;
  gap: 13px;
  flex-wrap: wrap;
}

/* hero hardware scene -------------------------------------- */
.scene-wrap {
  position: relative;
  max-width: 940px;
  margin: 54px auto 0;
}
.scene { width: 100%; height: auto; overflow: visible; }

.scene-label {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border-radius: 100px;
  border: 1px solid var(--line);
  background: rgba(14, 14, 18, 0.82);
  backdrop-filter: blur(8px);
  font-size: 12.5px;
  font-weight: 560;
  color: var(--text-2);
  white-space: nowrap;
}
.scene-label .pip { width: 6px; height: 6px; border-radius: 50%; }
.scene-label.sender { left: 6%; top: 90%; }
.scene-label.sender .pip { background: var(--amber); }
.scene-label.receiver { left: 55%; top: 90%; }
.scene-label.receiver .pip { background: var(--blue); }
.scene-label b { color: var(--text); font-weight: 620; }

@media (max-width: 700px) { .scene-label { display: none; } }

/* flowing beam animation */
.beam-dash {
  stroke-dasharray: 5 11;
  animation: flow 1.4s linear infinite;
}
@keyframes flow { to { stroke-dashoffset: -32; } }

.beam-dot { animation: travel 3.1s var(--ease) infinite; }
.beam-dot.d2 { animation-delay: 1.03s; }
.beam-dot.d3 { animation-delay: 2.06s; }
@keyframes travel {
  0%   { transform: translateX(0);   opacity: 0; }
  12%  { opacity: 1; }
  80%  { opacity: 1; }
  100% { transform: translateX(268px); opacity: 0; }
}

.screen-pulse { animation: pulse 4.4s ease-in-out infinite; transform-origin: center; }
@keyframes pulse { 0%, 100% { opacity: 0.72; } 50% { opacity: 1; } }

/* sections ------------------------------------------------- */
section { padding: 108px 0; position: relative; }

.head { max-width: 660px; margin: 0 auto 62px; text-align: center; }
.kicker {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 640;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 16px;
}
h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.028em;
  font-weight: 660;
  text-wrap: balance;
}
html.lang-zh h2 { letter-spacing: -0.015em; }
.head p { margin: 0; color: var(--text-2); font-size: 17px; }

/* problem -------------------------------------------------- */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
@media (max-width: 760px) { .problem-grid { grid-template-columns: 1fr; } }

.panel {
  position: relative;
  padding: 38px 34px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--surface-2), rgba(255, 255, 255, 0.012));
  overflow: hidden;
}
.panel::after {
  content: "";
  position: absolute;
  width: 260px; height: 260px;
  border-radius: 50%;
  filter: blur(70px);
  top: -130px; right: -110px;
  opacity: 0.5;
}
.panel.p-amber::after { background: rgba(233, 167, 101, 0.4); }
.panel.p-blue::after { background: rgba(111, 182, 230, 0.34); }
.panel .glyph { margin-bottom: 22px; }
.panel h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 640;
  letter-spacing: -0.015em;
}
.panel p { margin: 0; color: var(--text-2); font-size: 15px; }

.verdict {
  max-width: 900px;
  margin: 24px auto 0;
  padding: 26px 32px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(233, 167, 101, 0.22);
  background: linear-gradient(100deg, rgba(233, 167, 101, 0.11), rgba(111, 182, 230, 0.07));
  text-align: center;
  font-size: 17px;
  font-weight: 580;
  letter-spacing: -0.01em;
}

/* steps ---------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  max-width: 960px;
  margin: 0 auto;
}
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }
.step {
  padding: 32px 28px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--surface);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.step:hover { border-color: var(--line-2); transform: translateY(-3px); }
.step .n {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 11px;
  margin-bottom: 20px;
  font-size: 14px;
  font-weight: 680;
  color: var(--amber-hot);
  background: rgba(233, 167, 101, 0.12);
  border: 1px solid rgba(233, 167, 101, 0.2);
}
.step h3 { margin: 0 0 9px; font-size: 17px; font-weight: 620; letter-spacing: -0.015em; }
.step p { margin: 0; color: var(--text-2); font-size: 14.5px; }

/* bento features ------------------------------------------- */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 900px) { .bento { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .bento { grid-template-columns: 1fr; } }

.cell {
  position: relative;
  padding: 30px 28px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.cell:hover { border-color: var(--line-2); background: var(--surface-2); }
.cell.wide { grid-column: span 2; }
@media (max-width: 620px) { .cell.wide { grid-column: span 1; } }

.cell .ico {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 12px;
  margin-bottom: 20px;
  color: var(--amber-hot);
  background: rgba(233, 167, 101, 0.1);
  border: 1px solid rgba(233, 167, 101, 0.16);
}
.cell.blue .ico {
  color: var(--blue-hot);
  background: rgba(111, 182, 230, 0.1);
  border-color: rgba(111, 182, 230, 0.18);
}
.cell .ico svg { width: 19px; height: 19px; }
.cell h3 { margin: 0 0 9px; font-size: 17px; font-weight: 620; letter-spacing: -0.015em; }
.cell p { margin: 0; color: var(--text-2); font-size: 14.5px; max-width: 44ch; }

.cell-art { margin-top: 26px; }

/* requirements --------------------------------------------- */
.req {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
@media (max-width: 760px) { .req { grid-template-columns: 1fr; } }
.spec {
  padding: 34px 32px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--surface-2), rgba(255, 255, 255, 0.012));
}
.spec .tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 13px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 640;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.spec.s-amber .tag { color: var(--amber-hot); background: rgba(233, 167, 101, 0.12); }
.spec.s-blue .tag { color: var(--blue-hot); background: rgba(111, 182, 230, 0.12); }
.spec h3 { margin: 0 0 20px; font-size: 20px; font-weight: 640; letter-spacing: -0.02em; }
.spec ul { margin: 0; padding: 0; list-style: none; }
.spec li {
  display: flex;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  color: var(--text-2);
  font-size: 14.5px;
}
.spec li:first-child { border-top: none; }
.spec li svg { flex: 0 0 auto; width: 17px; height: 17px; margin-top: 4px; color: var(--text-3); }
.spec b { color: var(--text); font-weight: 620; }
.req-note {
  max-width: 900px;
  margin: 22px auto 0;
  text-align: center;
  font-size: 13.5px;
  color: var(--text-3);
}

/* faq ------------------------------------------------------ */
.faq { max-width: 780px; margin: 0 auto; }
.qa {
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--surface);
  margin-bottom: 12px;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.qa[open] { border-color: var(--line-2); background: var(--surface-2); }
.qa summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 26px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.012em;
}
.qa summary::-webkit-details-marker { display: none; }
.qa .chev {
  flex: 0 0 auto;
  width: 18px; height: 18px;
  color: var(--text-3);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease);
}
.qa[open] .chev { transform: rotate(180deg); color: var(--amber); }
.qa p {
  margin: 0;
  padding: 0 26px 24px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.72;
}

/* cta band ------------------------------------------------- */
.band {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 74px 40px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(233, 167, 101, 0.13), rgba(111, 182, 230, 0.09) 60%, rgba(255, 255, 255, 0.02));
  text-align: center;
  overflow: hidden;
}
.band h2 { margin-bottom: 14px; }
.band p { max-width: 500px; margin: 0 auto 32px; color: var(--text-2); font-size: 16.5px; }

/* footer --------------------------------------------------- */
footer { padding: 72px 0 56px; border-top: 1px solid var(--line); }
.foot-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}
.foot-brand { display: flex; align-items: center; gap: 11px; font-weight: 650; margin-bottom: 14px; }
.foot-brand .mark { width: 26px; height: 26px; border-radius: 8px; overflow: hidden; }
.foot-note { max-width: 420px; color: var(--text-3); font-size: 13.5px; line-height: 1.7; }
.foot-links { display: flex; gap: 32px; flex-wrap: wrap; }
.foot-links a { color: var(--text-2); font-size: 14.5px; font-weight: 520; transition: color 0.2s var(--ease); }
.foot-note a, .qa p a { text-decoration: underline; }
.foot-links a:hover { color: var(--text); }
.foot-base {
  padding-top: 26px;
  border-top: 1px solid var(--line);
  color: var(--text-3);
  font-size: 13px;
}

/* scroll reveal -------------------------------------------- */
/* 只在 JS 可用时（<head> 里给 html 加上 .js）才先把内容藏起来——没有 JS 的访客、
   不执行 JS 的爬虫/链接预览看到的是完整内容，而不是一整页透明的空白。 */
.js .rv {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
  transition-delay: var(--d, 0ms);
}
.js .rv.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .rv { opacity: 1; transform: none; transition: none; }
  .beam-dash, .beam-dot, .screen-pulse { animation: none; }
  .btn:hover, .step:hover { transform: none; }
}