:root {
  --ink: #10231f;
  --ink-soft: #2a403a;
  --mist: #edf3ef;
  --paper: #f6f8f5;
  --line: rgba(16, 35, 31, 0.12);
  --accent: #d96b3c;
  --accent-deep: #b65228;
  --panel: #16332d;
  --panel-2: #1f443c;
  --glow-line: #8fd9b8;
  --font-display: "Instrument Serif", "Songti SC", "Noto Serif SC", serif;
  --font-body: "Sora", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(217, 107, 60, 0.16), transparent 55%),
    radial-gradient(700px 380px at 90% 8%, rgba(143, 217, 184, 0.18), transparent 50%),
    linear-gradient(180deg, #f3f6f2 0%, var(--paper) 38%, #eef2ee 100%);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 6vw;
  backdrop-filter: blur(10px);
  background: rgba(246, 248, 245, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.top.is-stuck {
  border-bottom-color: var(--line);
  background: rgba(246, 248, 245, 0.92);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.7rem;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  gap: 1.4rem;
  align-items: center;
  font-size: 0.92rem;
}

.nav a {
  opacity: 0.78;
}

.nav a:hover {
  opacity: 1;
}

.nav-cta {
  opacity: 1 !important;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
}

.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 2.5rem;
  align-items: center;
  padding: 4.5vh 6vw 8vh;
}

.hero-copy {
  max-width: 34rem;
  animation: rise 0.9s ease both;
}

.brand-mark {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 4.6rem);
  line-height: 1;
  letter-spacing: 0.01em;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  font-weight: 400;
  line-height: 1.18;
}

.lead {
  margin: 0 0 1.8rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 32rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

.btn-ghost {
  border: 1px solid var(--ink);
  background: transparent;
}

.hero-visual {
  position: relative;
  min-height: 420px;
  animation: rise 1.05s 0.12s ease both;
}

.panel {
  height: 100%;
  min-height: 420px;
  border-radius: 18px;
  overflow: hidden;
  background:
    linear-gradient(160deg, rgba(143, 217, 184, 0.12), transparent 40%),
    linear-gradient(180deg, var(--panel), #0d211c 100%);
  color: #e7f2ec;
  border: 1px solid rgba(255, 255, 255, 0.08);
  transform: perspective(1200px) rotateY(-8deg) rotateX(3deg);
  transform-origin: left center;
  transition: transform 0.5s ease;
}

.hero-visual:hover .panel {
  transform: perspective(1200px) rotateY(-3deg) rotateX(1deg);
}

.panel-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1rem;
  background: rgba(0, 0, 0, 0.22);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.panel-bar span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
}

.panel-bar span:nth-child(1) { background: #e07a5f; }
.panel-bar span:nth-child(2) { background: #e9c46a; }
.panel-bar span:nth-child(3) { background: #8fd9b8; }

.panel-bar em {
  margin-left: 0.6rem;
  font-style: normal;
  font-size: 0.82rem;
  opacity: 0.75;
}

.panel-body {
  display: grid;
  grid-template-columns: 118px 1fr;
  min-height: 360px;
}

.side {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1rem 0.8rem;
  background: rgba(0, 0, 0, 0.18);
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.78rem;
}

.side i {
  font-style: normal;
  opacity: 0.55;
  padding: 0.35rem 0.45rem;
  border-radius: 8px;
}

.side i.on {
  opacity: 1;
  background: rgba(143, 217, 184, 0.16);
  color: var(--glow-line);
}

.main-pane {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto 1fr auto;
  gap: 0.85rem;
  padding: 1rem;
}

.kpi {
  padding: 0.85rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}

.kpi b {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  opacity: 0.6;
}

.kpi strong {
  display: block;
  margin-top: 0.35rem;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.chart {
  grid-column: 1 / -1;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(143, 217, 184, 0.08), transparent),
    rgba(0, 0, 0, 0.15);
  padding: 0.6rem;
}

.chart svg {
  width: 100%;
  height: 110px;
  display: block;
}

.chart-line {
  fill: none;
  stroke: var(--glow-line);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 420;
  stroke-dashoffset: 420;
  animation: draw 1.6s 0.4s ease forwards;
}

.feed {
  grid-column: 1 / -1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
  font-size: 0.8rem;
}

.feed li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0.7rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
}

.feed time {
  opacity: 0.45;
  white-space: nowrap;
}

.section {
  padding: 5.5rem 6vw;
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.4rem;
}

.section-head h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: 400;
  line-height: 1.2;
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.fit,
.scenes,
.faq {
  border-top: 1px solid var(--line);
}

.fit-list,
.scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem 2.5rem;
}

.fit-list h3,
.scene-list h3,
.ability-list h3 {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.fit-list p,
.scene-list p,
.ability-list p,
.deliver-flow p,
.faq-list p {
  margin: 0;
  color: var(--ink-soft);
}

.faq-list {
  display: grid;
  gap: 0.75rem;
  max-width: 48rem;
}

.faq-list details {
  border-top: 1px solid var(--line);
  padding: 1rem 0 0.85rem;
}

.faq-list details:first-child {
  border-top: 0;
  padding-top: 0;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1;
}

.faq-list details[open] summary::after {
  content: "–";
}

.faq-list details p {
  margin-top: 0.7rem;
  max-width: 42rem;
}

.faq-list a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ability {
  background:
    linear-gradient(180deg, rgba(16, 35, 31, 0.03), transparent 30%),
    transparent;
}

.ability-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.ability-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.5rem 1.2rem 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.ability-list li:nth-child(odd) {
  padding-right: 2rem;
  border-right: 1px solid var(--line);
}

.ability-list li:nth-child(even) {
  padding-left: 2rem;
}

.num {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
}

.deliver-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.deliver-flow p {
  padding-top: 1rem;
  border-top: 2px solid var(--ink);
}

.deliver-flow strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--ink);
  font-size: 1.05rem;
}

.contact {
  padding-bottom: 4rem;
}

.contact-plane {
  padding: 3.2rem 6vw;
  margin: 0 -6vw;
  width: calc(100% + 12vw);
  background:
    radial-gradient(700px 280px at 20% 0%, rgba(217, 107, 60, 0.22), transparent 60%),
    linear-gradient(135deg, #17362f 0%, #10231f 55%, #1a2e28 100%);
  color: #f3f7f4;
}

.contact-plane h2 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  max-width: 18ch;
  line-height: 1.15;
}

.contact-plane > p {
  margin: 0 0 1.6rem;
  max-width: 36rem;
  color: rgba(243, 247, 244, 0.78);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.contact .btn-primary {
  background: #f2f5f2;
  color: var(--ink);
  border-color: #f2f5f2;
}

.contact .btn-primary:hover {
  background: #fff;
  border-color: #fff;
}

.contact .btn-ghost {
  border-color: rgba(242, 245, 242, 0.55);
  color: #f2f5f2;
}

.contact-note {
  margin: 0;
  font-size: 0.88rem;
  color: rgba(243, 247, 244, 0.5);
}

.foot {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.4rem 6vw 2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.foot strong {
  display: block;
  margin-bottom: 0.25rem;
}

.foot p {
  margin: 0;
  max-width: 28rem;
}

.foot-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  text-align: right;
}

.foot-links a:hover {
  color: var(--accent);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2.5rem;
  }

  .hero-visual {
    min-height: 360px;
  }

  .panel {
    transform: none;
  }

  .hero-visual:hover .panel {
    transform: none;
  }

  .fit-list,
  .scene-list,
  .deliver-flow,
  .ability-list {
    grid-template-columns: 1fr;
  }

  .foot,
  .foot-links {
    text-align: left;
  }

  .foot {
    flex-direction: column;
  }

  .ability-list li,
  .ability-list li:nth-child(odd),
  .ability-list li:nth-child(even) {
    padding: 1.3rem 0;
    border-right: 0;
  }
}

@media (max-width: 640px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .brand-mark {
    font-size: 2.6rem;
  }

  .panel-body {
    grid-template-columns: 1fr;
  }

  .side {
    flex-direction: row;
    flex-wrap: wrap;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .contact-plane {
    margin: 0;
    width: 100%;
    border-radius: 18px;
    padding: 2.4rem 1.4rem;
  }

  .contact {
    padding-left: 6vw;
    padding-right: 6vw;
  }
}