/* 说明页（含登录窗口）样式 */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --text: #1f2328;
  --sub: #6b7280;
  --border: #e5e7eb;
  --bg: #ffffff;
  --soft: #f7f8fb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 22px;
}

/* ---------------- 顶栏 ---------------- */
.top {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(180%) blur(10px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.top .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.logo { display: flex; align-items: center; gap: 11px; }

.logo .mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 19px;
  font-weight: 700;
}

.logo .names b { display: block; font-size: 15px; line-height: 1.3; }
.logo .names small { color: var(--sub); font-size: 12px; }

.links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
}

.links > a { color: #374151; }

@media (max-width: 760px) {
  .links > a:not(.btn) { display: none; }
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 9px;
  border: 1px solid transparent;
  font-size: 14px;
  cursor: pointer;
  transition: .16s;
  white-space: nowrap;
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(79, 70, 229, .28);
}

.btn-primary:hover { background: var(--primary-dark); }

.btn-line { border-color: var(--border); color: #374151; background: #fff; }
.btn-line:hover { border-color: #c7cad4; }

.btn-ghost { border-color: var(--border); color: var(--primary); background: #fff; }

.btn-block { width: 100%; }

/* ---------------- Hero ---------------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 40px;
  padding: 56px 22px 40px;
  align-items: start;
}

@media (max-width: 940px) {
  .hero { grid-template-columns: 1fr; }
}

.pill {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  background: #eef2ff;
  color: var(--primary-dark);
  font-size: 12.5px;
  border: 1px solid #dfe3ff;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.25;
  margin: 16px 0 14px;
  letter-spacing: -1px;
}

@media (max-width: 640px) { .hero h1 { font-size: 30px; } }

.lead { color: #4b5563; font-size: 15.5px; max-width: 620px; }

.hero-actions { display: flex; gap: 12px; margin: 22px 0 18px; flex-wrap: wrap; }

.ticks { list-style: none; padding: 0; margin: 0; color: #4b5563; font-size: 14px; }
.ticks li { padding-left: 22px; position: relative; margin-bottom: 6px; }
.ticks li::before { content: "✓"; color: var(--primary); position: absolute; left: 0; font-weight: 700; }

/* ---------------- 登录卡片 ---------------- */
.login-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 22px;
  background: #fff;
  box-shadow: 0 18px 40px rgba(16, 24, 40, .09);
}

.login-card h2 { margin: 0 0 2px; font-size: 19px; }
.login-card .sub { margin: 0 0 18px; color: var(--sub); font-size: 13px; }

.login-card label {
  display: block;
  font-size: 13px;
  color: #374151;
  margin: 10px 0 5px;
  font-weight: 500;
}

.login-card input[type=text],
.login-card input[type=password] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
}

.login-card input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .12);
}

.pwd-box { position: relative; }

.pwd-box .eye {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  border: 0;
  background: none;
  cursor: pointer;
  font-size: 15px;
  opacity: .6;
}

.remember {
  display: flex !important;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--sub);
  margin: 12px 0 0 !important;
  font-weight: 400 !important;
}

.remember input { width: auto !important; }

.err {
  display: none;
  margin-top: 12px;
  padding: 9px 12px;
  border-radius: 8px;
  background: #fdecec;
  color: #dc2626;
  font-size: 13px;
}

.err.show { display: block; }

.login-card .foot {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  color: var(--sub);
  font-size: 12.5px;
  text-align: center;
}

/* ---------------- 内容区块 ---------------- */
.block { padding: 46px 22px; }
.block.alt { background: var(--soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.sec-title { font-size: 26px; margin: 0 0 6px; }
.sec-sub { color: var(--sub); margin: 0 0 24px; font-size: 14.5px; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

@media (max-width: 940px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }

.cards .card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  background: #fff;
  transition: .18s;
}

.cards .card:hover { box-shadow: 0 10px 26px rgba(16, 24, 40, .08); transform: translateY(-2px); }
.cards .card .ico { font-size: 24px; margin-bottom: 8px; }
.cards .card h3 { margin: 0 0 6px; font-size: 15.5px; }
.cards .card p { margin: 0; color: #4b5563; font-size: 13.5px; }

.steps { padding-left: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }

.steps li {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}

.steps li b { display: block; margin-bottom: 6px; font-size: 15px; }
.steps li p { margin: 0; color: #4b5563; font-size: 13.5px; }

code {
  background: #f3f4f6;
  padding: 1px 6px;
  border-radius: 5px;
  font-family: Menlo, Consolas, monospace;
  font-size: 12.5px;
}

.callout {
  margin-top: 20px;
  border-left: 3px solid var(--primary);
  background: #eef2ff;
  padding: 14px 16px;
  border-radius: 8px;
  font-size: 13.5px;
  color: #3730a3;
}

/* 安全说明区：与功能区共用 .cards 样式，本页不再出现任何内网架构信息 */

.foot-bar {
  padding: 26px 0;
  border-top: 1px solid var(--border);
  color: var(--sub);
  font-size: 13px;
  text-align: center;
}

.foot-bar .small { font-size: 12px; opacity: .85; }