@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700;900&display=swap");

:root {
  --paper: #f6f6f1;
  --ink: #171711;
  --ink-soft: #525246;
  --muted: #deded4;
  --line: #c7c7bc;
  --green: #2fbf71;
  --green-dark: #0a7c43;
  --red: #e6482e;
  --blue: #2563eb;
  --yellow: #f7c948;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(23, 23, 17, 0.14);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(23, 23, 17, 0.04) 1px, transparent 1px),
    linear-gradient(rgba(23, 23, 17, 0.04) 1px, transparent 1px),
    var(--paper);
  background-size: 36px 36px;
  font-family: "IBM Plex Sans", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.container {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--ink);
  background: rgba(246, 246, 241, 0.92);
  backdrop-filter: blur(14px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  text-decoration: none;
}

.brand-logo {
  width: 38px;
  height: 38px;
  filter: drop-shadow(2px 2px 0 rgba(23, 23, 17, 0.18));
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav a,
.header-action {
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover,
.header-action:hover {
  color: var(--ink);
}

.header-action {
  padding: 8px 12px;
  border: 1px solid var(--ink);
  background: var(--yellow);
  color: var(--ink);
}

.section-band {
  border-bottom: 1px solid var(--line);
}

.hero {
  padding: 74px 0 0;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  gap: 48px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green-dark);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0;
}

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

h1 {
  max-width: 760px;
  font-size: 4.6rem;
  line-height: 0.98;
  font-weight: 900;
}

h2 {
  font-size: 3rem;
  line-height: 1.08;
  font-weight: 900;
}

h3 {
  font-size: 1.2rem;
  line-height: 1.25;
}

.hero-lead,
.section-heading p,
.plain-panel p,
.workspace-preview p,
.loop-list p,
.scenario-grid p,
.roadmap p,
.form-note {
  color: var(--ink-soft);
}

.hero-lead {
  margin-top: 24px;
  max-width: 680px;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

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

.button:disabled {
  cursor: wait;
  opacity: 0.68;
  transform: none;
  box-shadow: 4px 4px 0 var(--ink);
}

.button-secondary {
  background: var(--white);
}

.hero-asset {
  margin: 0;
  border: 1px solid var(--ink);
  border-radius: 8px;
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow);
}

.signal-strip {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.signal-strip article {
  min-height: 156px;
  padding: 20px;
  border-right: 1px solid var(--ink);
  background: var(--paper);
}

.signal-index {
  display: inline-block;
  margin-bottom: 22px;
  color: var(--red);
  font-weight: 900;
}

.signal-strip strong {
  display: block;
  font-size: 1.1rem;
}

.signal-strip p {
  margin-top: 8px;
  color: var(--ink-soft);
}

.section-heading {
  padding: 88px 0 30px;
  max-width: 840px;
}

.section-heading.compact {
  padding-bottom: 8px;
}

.section-heading p {
  margin-top: 16px;
  font-size: 1.05rem;
}

.problem-grid,
.scenario-grid,
.roadmap {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding-bottom: 88px;
}

.plain-panel,
.scenario-grid article,
.roadmap article {
  min-height: 230px;
  padding: 22px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
}

.plain-panel span,
.roadmap span {
  display: inline-block;
  margin-bottom: 34px;
  color: var(--blue);
  font-weight: 900;
}

.plain-panel p,
.scenario-grid p,
.roadmap p {
  margin-top: 12px;
}

.surface-section {
  background: #10100d;
  color: var(--paper);
}

.surface-section .eyebrow,
.surface-section .section-heading p {
  color: #87e7ae;
}

.product-layout {
  padding-bottom: 92px;
}

.mode-switch {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.mode-button {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid #5f5f54;
  border-radius: 4px;
  color: var(--paper);
  background: transparent;
  cursor: pointer;
}

.mode-button.active {
  color: var(--ink);
  background: var(--green);
  border-color: var(--green);
  font-weight: 900;
}

.workspace-preview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
}

.workspace-main,
.workspace-aside {
  border: 1px solid #5f5f54;
  border-radius: 8px;
  background: #181813;
}

.workspace-main {
  min-height: 500px;
  padding: 28px;
}

.workspace-kicker {
  color: #87e7ae;
  font-weight: 900;
}

.workspace-main h3 {
  margin-top: 12px;
  max-width: 620px;
  font-size: 2rem;
}

.workspace-main > p:not(.workspace-kicker) {
  max-width: 680px;
  margin-top: 12px;
  color: #c9c9bd;
}

.task-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 32px;
}

.task-card {
  min-height: 178px;
  padding: 16px;
  border: 1px solid #5f5f54;
  border-radius: 6px;
  background: #22221b;
}

.task-card span {
  color: var(--green);
  font-weight: 900;
}

.task-card h4 {
  margin: 18px 0 8px;
  font-size: 1rem;
}

.task-card p {
  color: #b5b5aa;
}

.workspace-aside {
  padding: 16px;
}

.approval-panel,
.audit-item {
  padding: 16px;
  border: 1px solid #5f5f54;
  border-radius: 6px;
  background: #22221b;
}

.approval-panel strong {
  display: block;
  margin-top: 8px;
}

.approval-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.icon-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--green);
  border-radius: 4px;
  color: var(--ink);
  background: var(--green);
  font-weight: 900;
  cursor: pointer;
}

.icon-button.muted {
  border-color: #5f5f54;
  color: var(--paper);
  background: transparent;
}

.audit-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.audit-item span {
  display: block;
  color: var(--yellow);
  font-size: 0.84rem;
  font-weight: 900;
}

.audit-item p {
  margin-top: 6px;
  color: #c9c9bd;
}

.loop-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(420px, 1fr);
  gap: 54px;
  align-items: start;
  padding-bottom: 88px;
}

.loop-layout .section-heading {
  padding-bottom: 0;
}

.loop-list {
  display: grid;
  gap: 12px;
  padding-top: 92px;
}

.loop-list article {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
}

.loop-list span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 4px;
  color: var(--paper);
  background: var(--ink);
  font-weight: 900;
}

.loop-list p {
  grid-column: 2;
}

.scenario-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.scenario-grid article {
  min-height: 220px;
}

.scenario-grid h3::before {
  content: "";
  display: block;
  width: 38px;
  height: 8px;
  margin-bottom: 28px;
  background: var(--red);
}

.roadmap-section {
  background: var(--yellow);
}

.roadmap article:nth-child(2) {
  transform: translateY(22px);
}

.roadmap article:nth-child(3) {
  background: var(--ink);
  color: var(--paper);
}

.roadmap article:nth-child(3) p {
  color: #d8d8cf;
}

.access-section {
  background: var(--ink);
  color: var(--paper);
}

.access-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 430px;
  gap: 48px;
  align-items: center;
  padding: 88px 0;
}

.access-layout .eyebrow {
  color: #87e7ae;
}

.access-form {
  padding: 22px;
  border: 1px solid #5f5f54;
  border-radius: 8px;
  background: #22221b;
}

.access-form label {
  display: block;
  margin-bottom: 12px;
  font-weight: 900;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input {
  min-height: 48px;
  width: 100%;
  padding: 0 14px;
  border: 1px solid #5f5f54;
  border-radius: 4px;
  color: var(--paper);
  background: #10100d;
}

.form-note {
  margin-top: 12px;
  color: #c9c9bd;
}

.form-note[data-state="success"] {
  color: #87e7ae;
}

.form-note[data-state="error"] {
  color: #ff9a8a;
}

.site-footer {
  color: var(--paper);
  background: var(--ink);
}

.footer-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid #5f5f54;
}

@media (max-width: 1080px) {
  h1 {
    font-size: 3.6rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  .hero-layout,
  .loop-layout,
  .access-layout {
    grid-template-columns: 1fr;
  }

  .hero-asset {
    max-width: 780px;
  }

  .loop-list {
    padding-top: 0;
  }

  .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .site-nav {
    display: none;
  }

  .container {
    width: min(var(--max), calc(100% - 28px));
  }

  .hero {
    padding-top: 54px;
  }

  h1 {
    font-size: 2.7rem;
  }

  h2 {
    font-size: 2rem;
  }

  .signal-strip,
  .problem-grid,
  .scenario-grid,
  .roadmap,
  .workspace-preview,
  .task-board {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .roadmap article:nth-child(2) {
    transform: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }
}