:root {
  color-scheme: light;
  --navy: #123657;
  --blue: #176fa6;
  --pale: #eef6fa;
  --ink: #17242e;
  --muted: #60717e;
  --line: #d8e2e8;
  --white: #ffffff;
  --danger: #a33a3a;
  --shadow: 0 22px 60px rgba(18, 54, 87, 0.14);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: radial-gradient(circle at top right, rgba(23, 111, 166, 0.14), transparent 32rem), linear-gradient(145deg, #f7fafc 0%, #edf4f7 100%);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: 0.65; }
.portal-shell { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 48px 0 72px; }
.login-panel {
  width: min(520px, 100%);
  margin: 8vh auto 0;
  padding: 44px;
  border: 1px solid rgba(18, 54, 87, 0.1);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}
.login-mark {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 14px;
  color: var(--white);
  background: linear-gradient(145deg, var(--navy), var(--blue));
  font-family: Georgia, serif;
  font-size: 28px;
}
.eyebrow { margin: 24px 0 4px; color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: 0.18em; }
.login-panel h1 { margin: 0; color: var(--navy); font-family: Georgia, "Microsoft YaHei", serif; font-size: clamp(30px, 6vw, 42px); }
.login-copy { margin: 12px 0 28px; color: var(--muted); }
.unlock-form label { display: block; margin-bottom: 7px; color: var(--navy); font-size: 14px; font-weight: 700; }
.password-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
input {
  width: 100%;
  min-height: 46px;
  border: 1px solid #bfcdd5;
  border-radius: 9px;
  padding: 10px 13px;
  color: var(--ink);
  background: var(--white);
}
input:focus { outline: 3px solid rgba(23, 111, 166, 0.2); border-color: var(--blue); }
.password-row button { min-height: 46px; border: 0; border-radius: 9px; padding: 10px 20px; font-weight: 700; }
.password-row button { color: var(--white); background: var(--navy); }
.status { min-height: 1.7em; margin: 10px 0 0; color: var(--danger); }
.security-note { margin: 22px 0 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.manual-panel { border-radius: 22px; background: rgba(255, 255, 255, 0.95); box-shadow: var(--shadow); }
.manual-layout { display: grid; grid-template-columns: minmax(190px, 230px) minmax(0, 1fr); align-items: start; }
.manual-toc { position: sticky; top: 24px; margin: 20px 0 20px 20px; padding: 20px 16px; border: 1px solid var(--line); border-radius: 14px; background: #f7fafc; }
.toc-eyebrow { margin: 0 0 4px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: 0.16em; }
.manual-toc h2 { margin: 0; color: var(--navy); font-size: 20px; }
.toc-copy { margin: 6px 0 14px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.toc-list { display: grid; gap: 5px; margin: 0; padding: 0; list-style: none; }
.toc-link { display: block; padding: 7px 9px; border-radius: 8px; color: #315b76; font-size: 13px; line-height: 1.45; text-decoration: none; }
.toc-link:hover, .toc-link:focus-visible { color: var(--navy); background: #e7f1f6; outline: none; }
.manual-document { padding: 20px 28px 44px; }
.manual-header { padding: 28px; border-radius: 16px; color: var(--white); background: linear-gradient(130deg, var(--navy), #185f8c); }
.manual-header .eyebrow { margin-top: 0; color: #aedeef; }
.manual-header h1 { margin: 0; font-family: Georgia, "Microsoft YaHei", serif; font-size: clamp(32px, 6vw, 50px); }
.manual-meta { margin: 8px 0 0; color: #d9ebf3; }
.version-note { margin: 18px 0 0; padding: 12px 15px; border-left: 3px solid #70c1e4; background: rgba(255, 255, 255, 0.1); }
.manual-intro, .onboarding-panel { margin: 22px 0; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.manual-intro h2, .onboarding-panel h2 { margin: 0 0 8px; color: var(--navy); font-size: 20px; }
.manual-intro > p:last-child { margin-bottom: 0; }
.onboarding-panel { background: linear-gradient(145deg, #f6fafc, var(--pale)); }
.onboarding-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 18px; margin: 16px 0 0; padding: 0; list-style: none; counter-reset: onboarding; }
.onboarding-list li { position: relative; min-height: 50px; padding: 10px 12px 10px 46px; border: 1px solid rgba(18, 54, 87, 0.1); border-radius: 10px; background: rgba(255, 255, 255, 0.82); counter-increment: onboarding; }
.onboarding-list li::before { content: counter(onboarding); position: absolute; top: 10px; left: 12px; display: grid; width: 24px; height: 24px; place-items: center; border-radius: 50%; color: var(--white); background: var(--blue); font-size: 13px; font-weight: 700; }
.manual-section { margin-top: 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); overflow: hidden; scroll-margin-top: 24px; }
.manual-section summary { padding: 18px 20px; color: var(--navy); background: #f7fafc; font-size: 19px; font-weight: 750; cursor: pointer; }
.manual-section summary:focus-visible { outline: 3px solid rgba(23, 111, 166, 0.25); outline-offset: -3px; }
.section-body { padding: 6px 20px 22px; }
.section-body h3 { margin: 22px 0 7px; color: var(--navy); font-size: 17px; }
.section-body p { margin: 7px 0; }
.section-body ul, .section-body ol { padding-left: 24px; }
.section-body li { margin: 5px 0; }
.section-body a { color: #096ea8; overflow-wrap: anywhere; }
.section-body code { border: 1px solid #d8e5eb; border-radius: 5px; padding: 1px 5px; color: #244b65; background: #f4f8fa; font-family: Consolas, "Courier New", monospace; font-size: 0.92em; overflow-wrap: anywhere; }
.callout { margin: 16px 0; padding: 13px 15px; border-left: 3px solid var(--blue); background: var(--pale); }
.callout-warning { border-left-color: #d18a27; background: #fff7e8; }
.mentor-note { margin: 18px 0; padding: 16px 18px; border: 1px solid #cfe1ea; border-radius: 12px; background: linear-gradient(145deg, #f8fbfc, #eef6fa); }
.mentor-note p { margin: 7px 0 0; }
.note-label { display: inline-block; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: 0.12em; }
.milestone-list { display: grid; gap: 10px; padding-left: 24px; }
.milestone-list li { padding-left: 4px; }
.expectations-grid { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 16px; margin-top: 16px; }
.expectation-card { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: #f8fbfc; }
.expectation-card h3 { margin-top: 0; }
.expectation-card ul { margin-bottom: 0; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--navy); background: #f3f7f9; }
.manual-footer { margin: 24px 0 0; color: var(--muted); text-align: center; font-size: 13px; }

@media (max-width: 760px) {
  .portal-shell { width: min(100% - 20px, 1120px); padding: 18px 0 40px; }
  .login-panel { margin-top: 3vh; padding: 28px 22px; }
  .manual-layout { grid-template-columns: 1fr; }
  .manual-toc { position: static; margin: 12px 14px 0; padding: 15px 14px; }
  .toc-copy { margin-bottom: 10px; }
  .toc-list { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; scroll-snap-type: x proximity; }
  .toc-list li { flex: 0 0 auto; scroll-snap-align: start; }
  .toc-link { max-width: 220px; overflow: hidden; background: #edf5f8; text-overflow: ellipsis; white-space: nowrap; }
  .manual-document { padding: 12px 14px 30px; }
  .manual-header { padding: 22px 18px; }
  .manual-intro, .onboarding-panel { padding: 16px; }
  .onboarding-list, .expectations-grid { grid-template-columns: 1fr; }
  .manual-section summary { padding: 15px 16px; font-size: 17px; }
  .section-body { padding: 4px 16px 18px; }
  .password-row { grid-template-columns: 1fr; }
}