/* Meditative Humanities · unified session sidenav (apps.zenedinstitute.org) */

#sidenav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 160px;
  display: none;
  flex-direction: column;
  justify-content: flex-start;
  padding: 4.75rem 0 1.5rem 1rem;
  z-index: 200;
  pointer-events: none;
}

body.app-active #sidenav {
  display: flex;
}

#sidenav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

#sidenav li button {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.32rem 0.45rem;
  border-radius: 4px;
  text-align: left;
  pointer-events: all;
  transition: background 0.2s, color 0.2s;
  width: 100%;
}

#sidenav li button:hover {
  background: rgba(74, 158, 143, 0.08);
}

#sidenav li button .sn-zh {
  font-family: var(--font-zh, "Noto Serif TC", Georgia, serif);
  font-size: var(--t-sm);
  color: var(--sidenav-dim, #4a6878);
  letter-spacing: 0.06em;
  line-height: 1.45;
  transition: color 0.2s;
}

#sidenav li button .sn-num {
  font-family: var(--font-en, "EB Garamond", Georgia, serif);
  font-size: var(--t-xs);
  color: var(--sidenav-dim, #4a6878);
  opacity: 0.55;
  flex-shrink: 0;
  transition: color 0.2s, opacity 0.2s;
}

#sidenav li.active button .sn-zh {
  color: var(--sidenav-accent, #4a9e8f);
}

#sidenav li.active button .sn-num {
  color: var(--sidenav-accent, #4a9e8f);
  opacity: 0.85;
}

#sidenav li.active button {
  background: rgba(74, 158, 143, 0.06);
}

/* Screen-based sessions (s0–sn) */
body.app-active .screen {
  padding-left: 168px !important;
}

/* Module-wrap sessions (mod1–modn) */
body.app-active #module-wrap {
  padding-left: 168px !important;
}

body.app-active #module-label {
  left: 180px;
}

body.app-active #back-btn {
  left: 180px;
}

body.app-active #app-layout {
  grid-template-columns: 1fr !important;
}

body.app-active #sidebar {
  display: none !important;
}

@media (max-width: 720px) {
  #sidenav {
    width: 132px;
    padding-left: 0.65rem;
  }

  #sidenav li button .sn-zh {
    font-size: var(--t-xs);
    letter-spacing: 0.04em;
  }

  #sidenav li button .sn-num {
    font-size: var(--t-2xs);
  }

  body.app-active .screen,
  body.app-active #module-wrap {
    padding-left: 140px !important;
  }
}

@media (max-width: 480px) {
  #sidenav {
    width: 112px;
    padding-top: 4.25rem;
  }

  body.app-active .screen,
  body.app-active #module-wrap {
    padding-left: 118px !important;
  }
}

@media (max-width: 560px) {
  body.has-apps-nav #sidenav,
  #sidenav {
    top: auto;
    right: 0;
    bottom: 0;
    width: auto;
    max-width: 100vw;
    max-height: 4.75rem;
    padding: 0.35rem 0.45rem calc(0.35rem + env(safe-area-inset-bottom));
    overflow-x: auto;
    overflow-y: hidden;
    background: rgba(13, 27, 33, 0.96);
    border-top: 1px solid rgba(74, 158, 143, 0.18);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  #sidenav ul {
    flex-direction: row;
    gap: 0.35rem;
    min-width: max-content;
  }

  #sidenav li button {
    min-height: 44px;
    min-width: 54px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.1rem;
    padding: 0.3rem 0.45rem;
    text-align: center;
  }

  #sidenav li button .sn-zh {
    max-width: 4.8rem;
    font-size: var(--t-2xs, 0.6875rem);
    line-height: 1.25;
    letter-spacing: 0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  #sidenav li button .sn-num {
    font-size: var(--t-2xs, 0.6875rem);
  }

  body.app-active .screen,
  body.app-active #module-wrap,
  body.app-active .main,
  body.app-active .main-content,
  body.has-apps-nav.app-active .screen {
    padding-left: 0 !important;
    padding-bottom: calc(5.25rem + env(safe-area-inset-bottom)) !important;
  }

  body.app-active #module-label,
  body.app-active #back-btn {
    left: 1rem;
  }
}