:root {
    --purple:       #7B6FA0;
    --purple-dark:  #5C5278;
    --purple-deep:  #3D3654;
    --purple-light: #B8B0D0;
    --purple-pale:  #EDEAF4;
    --purple-faint: #F5F3FA;
    --cream:        #F9F7F4;
    --cream-dark:   #EDE9E2;
    --ink:          #1A1A1A;
    --ink-mid:      #4A4560;
    --ink-soft:     #6B6880;
    --ink-muted:    #9A97AC;
    --white:        #FFFFFF;
    --radius-sm:    10px;
    --radius-md:    16px;
    --radius-lg:    24px;
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: 'DM Sans',"DM Sans Fallback", sans-serif;
    background: var(--cream);
    color: var(--ink);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 48px 24px;
  }
  .card {
    width: 100%;
    max-width: 860px;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(60,52,90,0.06), 0 12px 40px rgba(60,52,90,0.10);
  }
  .header {
    background: var(--purple-deep);
    padding: 28px 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .library-name { font-size: 12px; font-weight: 300; letter-spacing: 0.14em; text-transform: uppercase; color: var(--purple-light); }
  .experience-badge { font-size: 12px; font-weight: 400; letter-spacing: 0.08em; color: var(--purple-light); border: 1px solid rgba(184,176,208,0.35); padding: 5px 16px; border-radius: 40px; }
  .hero { padding: 52px 48px 40px; border-bottom: 1px solid var(--cream-dark); }
  .use-when-tag { display: inline-flex; align-items: center; gap: 8px; background: var(--purple-pale); color: var(--purple-dark); font-size: 12px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; padding: 7px 16px; border-radius: 40px; margin-bottom: 22px; }
  .use-when-tag::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--purple); flex-shrink: 0; }
  .hero-title { font-family: 'dm serif display',"dm serif display Fallback", serif; font-size: 46px; font-weight: 400; line-height: 1.1; color: var(--ink); margin-bottom: 18px; }
  .hero-title em { font-style: italic; color: var(--purple); }
  .hero-subtitle { font-size: 16px; font-weight: 300; line-height: 1.7; color: var(--ink-soft); max-width: 600px; }
  .journey { padding: 44px 48px 40px; border-bottom: 1px solid var(--cream-dark); }
  .section-label { font-size: 11px; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 28px; }
  .stages { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: start; gap: 0; }
  .connector { display: flex; align-items: center; justify-content: center; padding-top: 44px; width: 52px; }
  .stage { display: flex; flex-direction: column; }
  .stage-num { width: 30px; height: 30px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-family: 'dm serif display',"dm serif display Fallback", serif; font-size: 15px; margin-bottom: 14px; flex-shrink: 0; }
  .stage-body { border-radius: var(--radius-md); padding: 26px 24px; flex: 1; }
  .stage-name { font-family: 'dm serif display',"dm serif display Fallback", serif; font-size: 24px; font-weight: 400; line-height: 1.1; margin-bottom: 9px; }
  .stage-desc { font-size: 13.5px; font-weight: 300; line-height: 1.6; margin-bottom: 16px; }
  .stage-divider { height: 1px; margin-bottom: 14px; }
  .stage-detail { font-size: 12.5px; font-weight: 400; line-height: 1.7; }
  .s1 .stage-num  { background: var(--purple-deep); color: var(--purple-light); }
  .s1 .stage-body { background: var(--purple-deep); }
  .s1 .stage-name { color: #EAE7F2; }
  .s1 .stage-desc { color: var(--purple-light); }
  .s1 .stage-divider { background: rgba(255,255,255,0.12); }
  .s1 .stage-detail { color: #9A96B8; }
  .s2 .stage-num  { background: var(--purple); color: var(--white); }
  .s2 .stage-body { background: var(--white); border: 1px solid var(--cream-dark); }
  .s2 .stage-name { color: var(--ink); }
  .s2 .stage-desc { color: var(--ink-soft); }
  .s2 .stage-divider { background: var(--cream-dark); }
  .s2 .stage-detail { color: var(--ink-muted); }
  .s3 .stage-num  { background: var(--purple-light); color: var(--purple-deep); }
  .s3 .stage-body { background: var(--purple-faint); border: 1px solid var(--purple-pale); }
  .s3 .stage-name { color: var(--purple-deep); }
  .s3 .stage-desc { color: var(--ink-mid); }
  .s3 .stage-divider { background: var(--purple-pale); }
  .s3 .stage-detail { color: var(--ink-soft); }
  .metaphor { background: var(--purple-faint); border: 1px solid var(--purple-pale); border-radius: var(--radius-sm); padding: 12px 14px; display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
  .metaphor-text { font-size: 12px; font-weight: 400; color: var(--purple-dark); line-height: 1.55; font-style: italic; }
  .bottom { padding: 40px 48px 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: stretch; }
  .insight-card { background: var(--purple-deep); border-radius: var(--radius-md); padding: 30px 28px; }
  .card-label { font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 12px; }
  .insight-card .card-label { color: var(--purple-light); }
  .insight-text { font-size: 14.5px; font-weight: 300; line-height: 1.75; color: rgba(255,255,255,0.82); }
  .practice-card { background: var(--purple-faint); border: 1px solid var(--purple-pale); border-radius: var(--radius-md); padding: 30px 28px; display: flex; flex-direction: column; }
  .practice-card .card-label { color: var(--purple); }
  .practice-steps { list-style: none; flex: 1; }
  .practice-steps li { display: flex; align-items: flex-start; gap: 12px; font-size: 14px; font-weight: 300; line-height: 1.6; color: var(--ink-mid); padding: 9px 0; border-bottom: 1px solid var(--purple-pale); }
  .practice-steps li:last-child { border-bottom: none; }
  .step-num { width: 22px; height: 22px; border-radius: 50%; background: var(--purple); color: white; font-size: 11px; font-weight: 500; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px; }
  .return-note { margin-top: 16px; font-size: 12px; font-weight: 400; color: var(--ink-muted); font-style: italic; }

body { padding: 0; display: block; background: var(--cream); }
.library-shell { display: flex; min-height: 100vh; }
.sidebar { width: 300px; flex-shrink: 0; background: var(--purple-deep); display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.sidebar-header { padding: 36px 28px 24px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.sidebar-eyebrow { font-size: 10px; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--purple-light); margin-bottom: 10px; }
.sidebar-title { font-family: 'dm serif display',"dm serif display Fallback", serif; font-size: 20px; font-weight: 400; color: #EAE7F2; line-height: 1.2; }
.sidebar-title em { font-style: italic; color: var(--purple-light); }
.sidebar-prompt { padding: 18px 28px 10px; font-size: 11px; font-weight: 400; letter-spacing: 0.06em; color: rgba(255,255,255,0.35); text-transform: uppercase; }
.menu-item { display: flex; align-items: flex-start; gap: 12px; padding: 14px 28px; background: none; border: none; border-left: 2px solid transparent; text-align: left; cursor: pointer; width: 100%; transition: background 0.12s, border-color 0.12s; }
.menu-item:hover { background: rgba(255,255,255,0.06); }
.menu-item.active { background: rgba(123,111,160,0.22); border-left-color: var(--purple-light); }
.menu-num { font-size: 10px; font-weight: 500; color: var(--purple-light); opacity: 0.6; flex-shrink: 0; margin-top: 2px; letter-spacing: 0.06em; }
.menu-title { font-size: 13px; font-weight: 300; color: rgba(255,255,255,0.75); line-height: 1.4; flex: 1; }
.menu-item.active .menu-title { color: #EAE7F2; font-weight: 400; }
.menu-arrow { font-size: 13px; color: var(--purple-light); opacity: 0; flex-shrink: 0; margin-top: 1px; transition: opacity 0.12s; }
.menu-item.active .menu-arrow, .menu-item:hover .menu-arrow { opacity: 1; }
.main { flex: 1; padding: 48px 40px; min-width: 0; overflow-y: auto; }
.home-view { max-width: 680px; }
.home-title { font-family: 'dm serif display',"dm serif display Fallback", serif; font-size: 38px; font-weight: 400; color: var(--ink); line-height: 1.1; margin-bottom: 18px; }
.home-title em { font-style: italic; color: var(--purple); }
.home-desc { font-size: 16px; font-weight: 300; line-height: 1.75; color: var(--ink-soft); margin-bottom: 36px; }
.home-prompt { display: inline-flex; align-items: center; gap: 8px; background: var(--purple-pale); color: var(--purple-dark); font-size: 13px; font-weight: 400; padding: 10px 20px; border-radius: 40px; }
.exp-section .card { max-width: 760px; }
.exp-section .nav-footer { max-width: 760px; margin-top: 24px; display: flex; justify-content: space-between; align-items: center; }
.nav-btn { font-family: 'DM Sans',"DM Sans Fallback", sans-serif; font-size: 13px; font-weight: 400; color: var(--purple-dark); padding: 10px 20px; border: 1px solid var(--purple-pale); border-radius: 40px; background: var(--white); cursor: pointer; }
.nav-btn:hover { background: var(--purple-faint); }
.nav-btn.disabled { opacity: 0.3; pointer-events: none; cursor: default; }
.nav-home { font-family: 'DM Sans',"DM Sans Fallback", sans-serif; font-size: 12px; font-weight: 400; color: var(--ink-muted); background: none; border: none; cursor: pointer; letter-spacing: 0.06em; }
.nav-home:hover { color: var(--purple); }