:root { color-scheme: dark; --bg: #0f172a; --panel: #1e293b; --line: #334155; --text: #e2e8f0; --dim: #94a3b8; --accent: #38bdf8; --bad: #f87171; }
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 16px/1.6 system-ui, "Noto Sans TC", sans-serif; }
[hidden] { display: none !important; }
button { background: var(--accent); color: #082f49; border: 0; border-radius: 8px; padding: .55em 1.1em; font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap; }
button:disabled { opacity: .5; cursor: default; }
input, textarea { width: 100%; background: var(--bg); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: .6em .7em; font: inherit; }
.error { color: var(--bad); min-height: 1.6em; margin: 0; }

#auth { min-height: 100%; display: grid; place-items: center; padding: 1rem; }
#auth-form { width: min(22rem, 100%); background: var(--panel); border-radius: 14px; padding: 1.5rem; display: grid; gap: .9rem; }
#auth-form h1 { margin: 0; font-size: 1.4rem; }
#auth-hint { margin: 0; color: var(--dim); font-size: .9rem; }
label { display: grid; gap: .3rem; font-size: .9rem; color: var(--dim); }

#app { height: 100%; display: flex; flex-direction: column; }
header { display: flex; align-items: center; gap: .8rem; padding: .6rem 1rem; padding-top: max(.6rem, env(safe-area-inset-top)); border-bottom: 1px solid var(--line); }
#who { color: var(--dim); margin-left: auto; font-size: .9rem; }
#logout { background: transparent; color: var(--dim); border: 1px solid var(--line); padding: .3em .8em; font-weight: 400; }

.grid { flex: 1; min-height: 0; display: grid; gap: .8rem; padding: .8rem; grid-template: "charts chat" 1fr "analysis chat" 1fr / 3fr 2fr; }
#charts { grid-area: charts; } #analysis { grid-area: analysis; } #chat { grid-area: chat; }
section { background: var(--panel); border-radius: 14px; padding: .8rem 1rem; display: flex; flex-direction: column; min-height: 0; }
h2 { margin: 0 0 .5rem; font-size: 1rem; color: var(--dim); font-weight: 600; }
.body { flex: 1; min-height: 0; overflow: auto; margin: 0; }
.empty { color: var(--dim); }
pre { white-space: pre-wrap; word-break: break-word; font: inherit; }

.chips { display: flex; gap: .4rem; overflow-x: auto; padding-bottom: .5rem; }
.chips button { background: transparent; color: var(--dim); border: 1px solid var(--line); padding: .15em .7em; font-weight: 400; white-space: nowrap; font-size: .85rem; }
.chips button[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); }

#chat-log { display: flex; flex-direction: column; gap: .5rem; padding-bottom: .5rem; }
.msg { max-width: 90%; padding: .5em .8em; border-radius: 12px; white-space: pre-wrap; word-break: break-word; }
.msg.me { align-self: flex-end; background: #0c4a6e; }
.msg.bot { align-self: flex-start; background: var(--bg); border: 1px solid var(--line); }
.msg.err { align-self: flex-start; color: var(--bad); border: 1px solid var(--bad); }
#chat-form { display: flex; gap: .5rem; align-items: flex-end; padding-bottom: env(safe-area-inset-bottom); }
#chat-input { resize: none; }

@media (max-width: 800px) {
  #app { height: auto; min-height: 100%; }
  .grid { grid-template: "chat" 70vh "analysis" auto "charts" auto / 1fr; }
  section { min-height: 12rem; }
}