:root {
  --ink: #06101d;
  --panel: rgba(10, 23, 39, 0.82);
  --panel-strong: rgba(12, 27, 46, 0.94);
  --line: rgba(255, 255, 255, 0.15);
  --text: #f4f8ff;
  --muted: #aebbd0;
  --teal: #28f3d1;
  --gold: #f8c55a;
  --cyan: #42caff;
  --radius: 8px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
}

body {
  min-height: 100svh;
  margin: 0;
  color: var(--text);
  background: #06101d;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  overflow-x: hidden;
}

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

button,
input,
select,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 0 clamp(18px, 4vw, 64px);
  background: rgba(6, 16, 29, 0.76);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 44px;
  height: 44px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 1px;
  white-space: nowrap;
}

.brand small {
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 2px;
}

.site-nav,
.panel-tabs,
.action-row,
.quick-proof,
.chip-row,
.contact-grid {
  display: flex;
  gap: 10px;
}

.site-nav {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link,
.panel-tab,
.text-link {
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-link {
  min-height: 40px;
  padding: 8px 13px;
  border-radius: var(--radius);
  color: #dce7f6;
}

.nav-link:hover,
.nav-link.active {
  color: #06101d;
  background: linear-gradient(135deg, var(--teal), var(--gold));
  font-weight: 800;
}

.single-screen {
  position: relative;
  min-height: 100svh;
  padding: 104px clamp(18px, 5vw, 72px) 54px;
  overflow: hidden;
}

.hero-bg,
.hero-bg::after,
.hero-bg img {
  position: absolute;
  inset: 0;
}

.hero-bg {
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.58;
}

.hero-bg::after {
  content: "";
  background:
    linear-gradient(90deg, rgba(6, 16, 29, 0.96) 0%, rgba(6, 16, 29, 0.8) 45%, rgba(6, 16, 29, 0.62) 100%),
    linear-gradient(180deg, rgba(6, 16, 29, 0.1) 0%, #06101d 100%);
}

.screen-layout {
  position: relative;
  z-index: 1;
  width: min(1240px, 100%);
  min-width: 0;
  min-height: calc(100svh - 158px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 470px);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
}

.pitch {
  min-width: 0;
  max-width: 100%;
}

.eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.eyebrow span,
.chip-row span {
  border: 1px solid rgba(40, 243, 209, 0.32);
  border-radius: 999px;
  padding: 7px 12px;
  color: var(--teal);
  background: rgba(40, 243, 209, 0.09);
  font-size: 13px;
  font-weight: 800;
}

h1 {
  max-width: 780px;
  margin-bottom: 20px;
  font-size: clamp(40px, 5.7vw, 76px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lead {
  max-width: 720px;
  margin-bottom: 26px;
  color: #d9e6f4;
  font-size: clamp(17px, 1.55vw, 22px);
  line-height: 1.75;
}

.action-row {
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

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

.btn.primary {
  color: #06101d;
  background: linear-gradient(135deg, var(--teal), var(--gold));
  font-weight: 900;
}

.btn.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.11);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn.ghost {
  color: var(--text);
  background: rgba(6, 16, 29, 0.44);
  border-color: rgba(40, 243, 209, 0.45);
}

.btn.full {
  width: 100%;
}

.quick-proof {
  flex-wrap: wrap;
  margin: 0;
}

.quick-proof div {
  min-width: 172px;
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px);
}

.quick-proof dt {
  color: var(--gold);
  font-size: 21px;
  font-weight: 900;
}

.quick-proof dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.guide-panel {
  min-height: 590px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 29, 49, 0.92), rgba(8, 19, 34, 0.86));
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.panel-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 18px;
  padding: 5px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.18);
}

.panel-tab {
  min-height: 38px;
  border-radius: 6px;
  color: var(--muted);
}

.panel-tab.active {
  color: #06101d;
  background: var(--teal);
  font-weight: 900;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.kicker {
  margin-bottom: 8px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 2px;
}

.panel h2 {
  margin-bottom: 16px;
  font-size: 30px;
  line-height: 1.18;
}

.choice-list {
  display: grid;
  gap: 11px;
}

.choice-list article,
.software-card,
.founder-mini,
.contact-item,
.lead-form {
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.075);
}

.choice-list article {
  padding: 15px;
}

.choice-list b {
  display: block;
  margin-bottom: 8px;
  color: var(--cyan);
  font-size: 13px;
}

.choice-list h3 {
  margin-bottom: 6px;
  font-size: 18px;
}

.choice-list p,
.software-card p,
.founder-mini p,
.form-note {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.65;
}

.text-link {
  margin-top: 14px;
  padding: 0;
  color: var(--gold);
  font-weight: 900;
}

.software-card {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
  padding: 12px;
}

.software-card img {
  width: 112px;
  height: 156px;
  object-fit: cover;
  object-position: top;
  border-radius: 7px;
}

.chip-row {
  flex-wrap: wrap;
  margin-top: 12px;
}

.chip-row span {
  padding: 5px 9px;
  font-size: 12px;
}

.founder-mini {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 14px;
  align-items: start;
  margin-bottom: 14px;
  padding: 12px;
}

.founder-mini img {
  width: 128px;
  height: 180px;
  object-fit: cover;
  object-position: top;
  border-radius: 7px;
}

.muted {
  margin-top: 10px;
  color: var(--muted);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 12px;
}

.contact-item {
  padding: 14px;
  text-align: left;
  cursor: pointer;
}

.contact-item span,
.contact-item strong {
  display: block;
}

.contact-item span {
  color: var(--muted);
  font-size: 13px;
}

.contact-item strong {
  margin-top: 5px;
  font-size: 17px;
}

.lead-form {
  display: grid;
  gap: 10px;
  padding: 12px;
}

.lead-form input,
.lead-form select,
.lead-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 6px;
  padding: 10px 11px;
  color: var(--text);
  background: rgba(3, 10, 18, 0.72);
  outline: none;
}

.lead-form input:focus,
.lead-form select:focus,
.lead-form textarea:focus {
  border-color: rgba(40, 243, 209, 0.75);
}

.lead-form option {
  color: #06101d;
}

.lead-form textarea {
  resize: vertical;
}

.form-note {
  font-size: 12px;
}

.site-footer {
  position: fixed;
  left: clamp(18px, 5vw, 72px);
  right: clamp(18px, 5vw, 72px);
  bottom: 14px;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: rgba(214, 226, 240, 0.72);
  font-size: 13px;
  pointer-events: none;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 42px;
  z-index: 40;
  transform: translate(-50%, 24px);
  width: min(460px, calc(100vw - 36px));
  padding: 13px 16px;
  border: 1px solid rgba(40, 243, 209, 0.35);
  border-radius: var(--radius);
  color: var(--text);
  background: rgba(6, 16, 29, 0.95);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (min-width: 981px) {
  body {
    overflow: hidden;
  }
}

@media (max-height: 780px) and (min-width: 981px) {
  .single-screen {
    padding-top: 88px;
  }

  .screen-layout {
    min-height: calc(100svh - 128px);
  }

  h1 {
    font-size: clamp(34px, 5vw, 62px);
  }

  .lead {
    margin-bottom: 20px;
    font-size: 17px;
  }

  .guide-panel {
    min-height: 540px;
  }

  .panel h2 {
    font-size: 26px;
  }
}

@media (max-width: 980px) {
  body {
    overflow-y: auto;
  }

  .site-header {
    height: auto;
    min-height: 70px;
    flex-wrap: wrap;
    padding-block: 10px;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .single-screen {
    min-height: auto;
    padding-top: 136px;
    padding-bottom: 70px;
  }

  .screen-layout {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .pitch {
    width: min(100%, 360px);
  }

  h1 {
    max-width: 100%;
    word-break: break-all;
  }

  .lead {
    max-width: 100%;
  }

  .guide-panel {
    min-height: auto;
  }

  .site-footer {
    position: static;
    padding: 0 18px 18px;
    flex-direction: column;
    background: #06101d;
  }
}

@media (max-width: 560px) {
  .brand small {
    display: none;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .single-screen {
    padding-inline: 18px;
    overflow: hidden;
  }

  h1 {
    max-width: calc(100vw - 36px);
    font-size: 31px;
    line-height: 1.12;
    overflow-wrap: anywhere;
    word-break: break-all;
  }

  .lead {
    max-width: calc(100vw - 36px);
    font-size: 16px;
  }

  .action-row .btn,
  .quick-proof div {
    width: 100%;
  }

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

  .software-card,
  .founder-mini {
    grid-template-columns: 1fr;
  }

  .software-card img,
  .founder-mini img {
    width: 100%;
    height: 220px;
  }

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