:root{
  --bg:#f6f6f4;
  --panel:#ffffff;
  --text:#1c1c1a;
  --text-muted:#68665f;
  --border:#e5e3db;
  --accent:#4b46c9;
  --accent-soft:#edecfb;
  --accent-text:#ffffff;
  --danger:#b3204a;
  --danger-soft:#fbe9ef;
  --radius:14px;
  --mono:"SFMono-Regular","Courier New",monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#151517;
    --panel:#1f1f22;
    --text:#ecebe6;
    --text-muted:#9d9b95;
    --border:#333134;
    --accent:#9a92ff;
    --accent-soft:#2a2650;
    --accent-text:#151517;
    --danger:#f295b0;
    --danger-soft:#3a1826;
    color-scheme: dark;
  }
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
}
.app{
  max-width:720px;
  margin:0 auto;
  min-height:100dvh;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  background:var(--panel);
  border-left:1px solid var(--border);
  border-right:1px solid var(--border);
}

/* ---------- Login gate ---------- */
.login-screen{
  position:fixed; inset:0; background:var(--bg);
  display:flex; align-items:center; justify-content:center;
  z-index:100; padding:20px;
}
.login-card{
  width:100%; max-width:340px; background:var(--panel);
  border:1px solid var(--border); border-radius:var(--radius);
  padding:28px 26px; text-align:center;
}
.login-card h1{font-size:19px; margin:0 0 6px}
.login-card p{font-size:13.5px; color:var(--text-muted); margin:0 0 20px}
.login-card input{
  width:100%; padding:11px 13px; border-radius:10px; border:1px solid var(--border);
  background:var(--bg); color:var(--text); font-size:15px; margin-bottom:10px;
}
.login-card button{
  width:100%; padding:11px 13px; border-radius:10px; border:none;
  background:var(--accent); color:var(--accent-text); font-weight:600; font-size:14px; cursor:pointer;
}
.login-error{color:var(--danger); font-size:13px; min-height:18px; margin-top:6px}

/* ---------- Top bar ---------- */
.topbar{
  display:flex; align-items:baseline; justify-content:space-between;
  padding:18px 20px 10px;
}
.topbar h1{font-size:17px; margin:0; font-weight:700}
.topbar .sub{font-size:12px; color:var(--text-muted)}
.topbar-actions{display:flex; gap:14px}
.link-btn{
  background:none; border:none; color:var(--text-muted); font-size:12.5px;
  cursor:pointer; padding:0; text-decoration:underline; text-underline-offset:2px;
}
.link-btn:hover{color:var(--accent)}

/* ---------- Day tabs ---------- */
.day-tabs{
  display:flex; gap:6px; overflow-x:auto; padding:4px 20px 14px;
  scrollbar-width:none;
}
.day-tabs::-webkit-scrollbar{display:none}
.day-tab{
  flex:0 0 auto; border:1px solid var(--border); background:var(--panel); color:var(--text);
  font-size:13px; font-weight:600; padding:8px 14px; border-radius:20px; cursor:pointer;
  white-space:nowrap;
}
.day-tab.active{background:var(--accent); border-color:var(--accent); color:var(--accent-text)}

.day-caption{
  padding:0 20px 12px; font-size:12.5px; color:var(--text-muted);
}

/* ---------- Schedule list ---------- */
.schedule-list{
  flex:1; min-height:0; overflow-y:auto; padding:0 20px 100px;
}
.block-row{
  display:flex; gap:12px; padding:11px 0; border-bottom:1px solid var(--border);
}
.block-row:last-child{border-bottom:none}
.block-time{
  flex:0 0 64px; font-family:var(--mono); font-size:13px; padding-top:1px; color:var(--text-muted);
}
.block-main{flex:1; min-width:0}
.block-activity{
  font-size:14.5px; font-weight:600; display:flex; align-items:center; gap:6px; line-height:1.4;
}
.block-note{font-size:12.5px; color:var(--text-muted); margin-top:2px; line-height:1.5}
.cat-dot{width:8px; height:8px; border-radius:50%; flex:0 0 8px}
.lock-icon{font-size:11px; opacity:.55}

.empty-state{padding:40px 0; text-align:center; color:var(--text-muted); font-size:13.5px}

/* ---------- Chat FAB + drawer ---------- */
.chat-fab{
  position:fixed; right:calc(50% - 360px + 20px); bottom:22px;
  width:52px; height:52px; border-radius:50%; border:none;
  background:var(--accent); color:var(--accent-text); font-size:22px;
  box-shadow:0 4px 14px rgba(0,0,0,.25); cursor:pointer; z-index:40;
  display:flex; align-items:center; justify-content:center;
}
@media (max-width:760px){
  .chat-fab{right:20px}
}
.chat-drawer{
  position:fixed; right:calc(50% - 360px + 20px); bottom:88px;
  width:340px; max-width:calc(100vw - 40px); height:460px; max-height:70vh;
  background:var(--panel); border:1px solid var(--border); border-radius:16px;
  box-shadow:0 10px 40px rgba(0,0,0,.25);
  display:flex; flex-direction:column; overflow:hidden;
  transform:translateY(16px) scale(.98); opacity:0; pointer-events:none;
  transition:transform .15s ease, opacity .15s ease;
  z-index:41;
}
@media (max-width:760px){
  .chat-drawer{right:20px; width:calc(100vw - 40px)}
}
.chat-drawer.open{transform:translateY(0) scale(1); opacity:1; pointer-events:auto}
.chat-header{
  padding:12px 14px; border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between;
}
.chat-header strong{font-size:13.5px}
.chat-header span{font-size:11px; color:var(--text-muted)}
.chat-close{background:none; border:none; font-size:16px; color:var(--text-muted); cursor:pointer}
.chat-messages{flex:1; overflow-y:auto; padding:12px 14px; display:flex; flex-direction:column; gap:10px}
.msg{max-width:85%; font-size:13px; line-height:1.5; padding:9px 12px; border-radius:12px; white-space:pre-wrap; word-break:break-word; user-select:text}
.msg.user{align-self:flex-end; background:var(--accent); color:var(--accent-text); border-bottom-right-radius:3px}
.msg.assistant{align-self:flex-start; background:var(--accent-soft); color:var(--text); border-bottom-left-radius:3px}
.msg.error{align-self:flex-start; background:var(--danger-soft); color:var(--danger); border-bottom-left-radius:3px}
.msg.system{align-self:center; background:transparent; color:var(--text-muted); font-size:11.5px; text-align:center}
.chat-input-row{
  display:flex; gap:8px; padding:10px; border-top:1px solid var(--border);
}
.chat-input-row input{
  flex:1; border:1px solid var(--border); border-radius:10px; padding:9px 11px;
  font-size:13.5px; background:var(--bg); color:var(--text);
}
.chat-input-row button{
  border:none; border-radius:10px; background:var(--accent); color:var(--accent-text);
  padding:0 14px; font-weight:600; font-size:13px; cursor:pointer;
}
.chat-input-row button:disabled{opacity:.5; cursor:default}
.chat-hint{font-size:10.5px; color:var(--text-muted); padding:0 14px 10px}

/* ---------- Detail / reference (collapsible) ---------- */
.detail-wrap{padding:8px 20px 28px; border-top:1px solid var(--border); margin-top:8px}
.detail-wrap summary{cursor:pointer; font-size:13px; font-weight:600; color:var(--text-muted); padding:12px 0}
.detail-body{font-size:13.5px; line-height:1.7}
.detail-body h2{font-size:15px; margin:22px 0 6px}
.detail-body h3{font-size:13.5px; margin:16px 0 4px}
.detail-body table{width:100%; border-collapse:collapse; font-size:12.5px; margin:8px 0}
.detail-body th,.detail-body td{text-align:left; padding:6px 8px; border-bottom:1px solid var(--border); vertical-align:top}
.detail-body th{background:var(--accent-soft); font-size:11px; text-transform:uppercase; color:var(--accent)}
.detail-body ul,.detail-body ol{padding-left:20px; margin:6px 0}
.detail-body blockquote{margin:10px 0; padding:9px 13px; border-left:3px solid var(--accent); background:var(--accent-soft); border-radius:0 8px 8px 0}
.detail-body .note{color:var(--text-muted); font-size:12px}

.toast{
  position:fixed; left:50%; bottom:24px; transform:translateX(-50%);
  background:var(--text); color:var(--bg); padding:10px 16px; border-radius:10px;
  font-size:13px; z-index:60; opacity:0; pointer-events:none; transition:opacity .2s;
}
.toast.show{opacity:1}