/* ── Student Chat Widget (alice blue/blue theme) ── */
#stChatFab {
  position:fixed;bottom:20px;right:20px;width:48px;height:48px;border-radius:50%;
  background:aliceblue;border:2px solid #3b82f6;cursor:pointer;
  display:flex;align-items:center;justify-content:center;z-index:500;
  box-shadow:0 4px 16px rgba(30,64,175,.25);transition:transform .2s,box-shadow .2s;
}
#stChatFab:hover{transform:scale(1.08);box-shadow:0 6px 24px rgba(30,64,175,.35);}
#stChatFab i{width:20px;height:20px;color:#1e40af;}
.st-chat-dot{
  position:absolute;top:-2px;right:-2px;width:16px;height:16px;border-radius:50%;
  background:#dc2626;color:#fff;font-size:.55rem;font-weight:800;
  display:none;align-items:center;justify-content:center;
  border:2px solid var(--pure-white,#fff);box-shadow:0 2px 6px rgba(220,38,38,.4);
}
#stChatPanel{
  position:fixed;bottom:80px;right:20px;width:340px;max-width:calc(100vw - 32px);
  height:460px;max-height:calc(100vh - 140px);
  background:var(--pure-white,#fff);border:var(--border-luxe,1px solid rgba(170,119,28,.15));
  border-radius:var(--radius-luxe,22px);display:none;flex-direction:column;
  z-index:500;overflow:hidden;box-shadow:0 8px 40px rgba(0,0,0,.12);
}
#stChatPanel.open{display:flex;}
.st-chat-head{
  display:flex;justify-content:space-between;align-items:center;
  padding:12px 16px;border-bottom:var(--border-luxe);
  background:linear-gradient(135deg,#dbeafe,#bfdbfe);
  color:#1e40af;font-family:'Cinzel',serif;font-size:.82rem;font-weight:700;
}
.st-chat-close{background:none;border:none;color:#1e40af;cursor:pointer;padding:2px;}
.st-chat-close i{width:16px;height:16px;}
.st-chat-close:hover{color:#1e3a5f;}
#stChatBody{flex:1;display:flex;flex-direction:column;overflow:hidden;}
#stChatMsgs{flex:1;overflow-y:auto;padding:12px 14px;display:flex;flex-direction:column;gap:8px;}
.st-chat-msg{max-width:85%;padding:8px 12px;border-radius:12px;font-size:.8rem;line-height:1.45;word-wrap:break-word;}
.st-chat-msg.admin{background:#f5f0e8;color:var(--obsidian,#1a1a1a);align-self:flex-start;border-bottom-left-radius:4px;}
.st-chat-msg.student{background:aliceblue;color:#1e40af;align-self:flex-end;border-bottom-right-radius:4px;}
.st-chat-msg .meta{font-size:.6rem;color:rgba(0,0,0,.35);margin-top:3px;}
.st-chat-msg.student .meta{color:rgba(30,64,175,.45);}
.st-chat-input-wrap{
  display:flex;gap:8px;padding:10px 12px;border-top:var(--border-luxe);
  background:var(--ivory-deep,#f5f2ec);
}
.st-chat-input-wrap input{
  flex:1;padding:9px 14px;border-radius:20px;border:var(--border-luxe);
  background:var(--pure-white,#fff);color:var(--obsidian,#1a1a1a);
  font-size:.8rem;outline:none;font-family:'Plus Jakarta Sans',sans-serif;
}
.st-chat-input-wrap input:focus{border-color:#3b82f6;}
.st-chat-input-wrap input::placeholder{color:var(--text-muted,#64748b);}
.st-chat-send{
  width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#1e40af,#3b82f6);
  border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.st-chat-send i{width:15px;height:15px;color:#fff;}
.st-chat-send:hover{box-shadow:0 2px 8px rgba(30,64,175,.35);}
.st-chat-empty{padding:24px;text-align:center;color:var(--text-muted,#64748b);font-size:.78rem;}

/* ── Dark Mode ── */
body.dark-mode #stChatPanel,
html.dark-mode #stChatPanel {
  background:#1c1c26;border-color:rgba(255,255,255,.08);
}
body.dark-mode .st-chat-msg.admin,
html.dark-mode .st-chat-msg.admin {
  background:#2a2a35;color:#e0e0e0;
}
body.dark-mode .st-chat-msg.student,
html.dark-mode .st-chat-msg.student {
  background:#1a2744;color:#bfdbfe;
}
body.dark-mode .st-chat-msg.student .meta,
html.dark-mode .st-chat-msg.student .meta {
  color:rgba(191,219,254,.45);
}
body.dark-mode .st-chat-msg .meta,
html.dark-mode .st-chat-msg .meta {
  color:rgba(255,255,255,.25);
}
body.dark-mode .st-chat-input-wrap,
html.dark-mode .st-chat-input-wrap {
  background:#15151d;border-top-color:rgba(255,255,255,.06);
}
body.dark-mode .st-chat-input-wrap input,
html.dark-mode .st-chat-input-wrap input {
  background:#1c1c26;border-color:rgba(255,255,255,.1);color:#e0e0e0;
}
body.dark-mode .st-chat-input-wrap input::placeholder,
html.dark-mode .st-chat-input-wrap input::placeholder {
  color:#5a677a;
}
body.dark-mode .st-chat-head,
html.dark-mode .st-chat-head {
  background:linear-gradient(135deg,#1a2744,#1e3a5f);color:#bfdbfe;
  border-bottom-color:rgba(255,255,255,.08);
}
body.dark-mode .st-chat-close,
html.dark-mode .st-chat-close {
  color:#bfdbfe;
}
body.dark-mode .st-chat-close:hover,
html.dark-mode .st-chat-close:hover {
  color:#fff;
}
body.dark-mode #stChatFab,
html.dark-mode #stChatFab {
  background:#1a2744;border-color:#3b82f6;
}
body.dark-mode #stChatFab i,
html.dark-mode #stChatFab i {
  color:#bfdbfe;
}
body.dark-mode .st-chat-empty,
html.dark-mode .st-chat-empty {
  color:#5a677a;
}
/* Same navy / amber treatment as ride support */
#stChatPanel{--sc-bg:#102139;--sc-soft:#172c46;--sc-ink:#f4f7fc;--sc-muted:#adbed3;--sc-line:#2b405b;width:420px;height:min(650px,calc(100dvh - 115px));max-height:calc(100dvh - 115px);background:var(--sc-bg);color:var(--sc-ink);border:1px solid var(--sc-line);border-radius:24px;box-shadow:0 24px 90px #0005;z-index:1500}[data-theme=light] #stChatPanel{--sc-bg:#fff;--sc-soft:#f3f6fa;--sc-ink:#14243d;--sc-muted:#64758a;--sc-line:#dde5ee}#stChatFab{width:54px;height:54px;border:0;border-radius:16px;background:#ffa052;color:#102139;z-index:1100}#stChatFab svg{color:#102139}.st-chat-head{padding:20px;background:var(--sc-soft)!important;color:var(--sc-ink)!important;border-bottom:1px solid var(--sc-line);font:700 17px 'DM Sans',Arial,sans-serif}.st-chat-close{width:36px;height:36px;border:1px solid var(--sc-line);border-radius:10px;color:var(--sc-ink)}#stChatMsgs{padding:20px;gap:12px}.st-chat-msg{padding:12px 15px;font-size:14px;line-height:1.6;border-radius:16px 16px 16px 4px}.st-chat-msg.admin{background:var(--sc-soft)!important;color:var(--sc-ink)!important}.st-chat-msg.student{background:#ffa052!important;color:#102139!important;border-radius:16px 16px 4px 16px}.st-chat-msg .meta{font-size:12px;color:inherit!important;opacity:.65}.st-chat-input-wrap{padding:14px;gap:10px;background:var(--sc-bg)!important;border-top:1px solid var(--sc-line)}.st-chat-input-wrap input{height:48px;min-width:0;padding:12px 14px;font-size:16px;background:var(--sc-soft)!important;color:var(--sc-ink)!important;border:1px solid var(--sc-line);border-radius:13px}.st-chat-send{width:48px;height:48px;background:#ffa052;border-radius:13px}.st-chat-send svg{color:#102139}#stChatPanel svg,#stChatFab svg{width:22px;height:22px;stroke-width:1.7}.st-chat-empty{font-size:14px;color:var(--sc-muted)}@media(max-width:700px){#stChatPanel{left:10px;right:10px;bottom:84px;width:auto;max-width:none}#stChatFab{bottom:90px;right:16px}}