/*
 * Educe 占位落地页 · www.educe.com.cn
 * 颜色取自产品设计令牌（IBM Carbon 灰阶 + 交互蓝），浅色 / 深色两套随系统设置切换。
 * 不加载任何外部字体与脚本。
 */

:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --layer: #f4f4f4;
  --border: #e0e0e0;
  --border-strong: #8d8d8d;
  --text: #161616;
  --text-2: #525252;
  --text-3: #6f6f6f;
  --link: #0f62fe;
  --link-hover: #0043ce;
  --focus: #0f62fe;

  --blue: #0f62fe;
  --blue-hover: #0050e6;
  --blue-active: #002d9c;
  --on-blue: #ffffff;
  --ins: #a6c8ff;
  --del: #da1e28;

  --shell: #161616;
  --shell-text: #ffffff;
  --shell-text-2: #c6c6c6;
  --shell-border: #393939;

  --font: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --layer: #262626;
    --border: #393939;
    --border-strong: #6f6f6f;
    --text: #f4f4f4;
    --text-2: #c6c6c6;
    --text-3: #a8a8a8;
    --link: #78a9ff;
    --link-hover: #a6c8ff;
    --focus: #ffffff;
    --ins: #0043ce;
    --del: #ff8389;
    --shell: #0b0b0b;
    --shell-border: #262626;
  }
}

/* ---------- 基础 ---------- */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  padding: 0;
  list-style: none;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.wrap {
  max-width: 1312px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- 按钮（Carbon：字靠左、图标靠右） ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-height: 48px;
  min-width: 200px;
  padding: 0 16px;
  border-radius: 2px;
  background: var(--blue);
  color: var(--on-blue);
  font-size: 14px;
  line-height: 1;
  transition: background-color 110ms cubic-bezier(0.2, 0, 0.38, 0.9);
}

.btn:hover {
  background: var(--blue-hover);
  color: var(--on-blue);
  text-decoration: none;
}

.btn:active {
  background: var(--blue-active);
}

.btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.btn svg {
  flex: none;
}

/* ---------- 顶栏 ---------- */

.shell {
  background: var(--shell);
  color: var(--shell-text);
  border-bottom: 1px solid var(--shell-border);
}

.shell .wrap {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  height: 48px;
  padding-right: 0;
}

.brand {
  display: flex;
  align-items: center;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.wordmark:hover {
  color: inherit;
  text-decoration: none;
}

.wordmark:focus-visible,
.shell .btn:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: -2px;
}

.badge {
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--shell-border);
  color: var(--shell-text-2);
  font-size: 12px;
}

.shell .btn {
  min-height: 48px;
  min-width: 160px;
  border-radius: 0;
}

/* ---------- 首屏 ---------- */

.hero-logo {
  display: block;
  width: auto;
  height: clamp(72px, 7.6vw, 110px);
  margin-bottom: 32px;
}

/* 原色 #1f4d59 在深色底上看不清，深色模式下整块显示成白色 */
@media (prefers-color-scheme: dark) {
  .hero-logo {
    filter: brightness(0) invert(1);
  }
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 96px 0;
}

h1 {
  font-size: clamp(32px, 4.2vw, 48px);
  font-weight: 300;
  line-height: 1.22;
}

h1 b {
  font-weight: 600;
}

.lead {
  margin-top: 20px;
  max-width: 32em;
  color: var(--text-2);
  font-size: 16px;
}

.cta {
  margin-top: 40px;
}

.illu {
  display: block;
  justify-self: end;
  width: 100%;
  max-width: 520px;
  height: auto;
}

/* ---------- 能力 ---------- */

.section-label {
  margin-bottom: 16px;
  color: var(--text-3);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.04em;
}

.caps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.caps li {
  min-height: 196px;
  padding: 20px 24px 32px;
  background: var(--layer);
}

.caps svg {
  display: block;
  margin-bottom: 28px;
  color: var(--text);
}

.caps h3 {
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.caps p {
  color: var(--text-2);
  font-size: 14px;
}

/* ---------- 内测提示 ---------- */

.note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  margin: 64px 0 96px;
  padding: 16px 20px;
  border-left: 3px solid var(--blue);
  background: var(--layer);
  font-size: 14px;
}

.note strong {
  font-weight: 600;
}

/* ---------- 页脚 ---------- */

footer {
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: 12px;
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 20px;
  padding-bottom: 28px;
}

.filings {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

footer a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-3);
}

footer a:hover {
  color: var(--text);
}

footer img {
  width: 18px;
  height: 20px;
}

/* ---------- 窄屏 ---------- */

@media (max-width: 1056px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 64px 0;
  }

  .illu {
    justify-self: start;
    max-width: 440px;
  }

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

@media (max-width: 600px) {
  .wrap {
    padding: 0 16px;
  }

  .badge {
    display: none;
  }

  .shell .btn {
    min-width: 0;
    gap: 16px;
  }

  .hero {
    gap: 40px;
    padding: 48px 0;
  }

  .cta .btn {
    width: 100%;
  }

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

  .caps li {
    display: grid;
    grid-template-columns: 20px 1fr;
    column-gap: 16px;
    min-height: 0;
    padding: 20px 16px;
  }

  .caps svg {
    grid-row: span 2;
    margin: 2px 0 0;
  }

  .caps h3 {
    margin-bottom: 4px;
  }

  .note {
    margin: 40px 0 56px;
  }

  footer .wrap {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}