/* ============================================================
   MR-X · 灵玄 — Web UI design system
   Palette: ink / vermilion (朱砂) / celadon (青瓷) / gold (鎏金)
   Aesthetic: Daoist scholar's study at night — dark, warm, refined.
   ============================================================ */

:root {
  --ink-950: #0b0e14;
  --ink-900: #10141d;
  --ink-850: #141927;
  --ink-800: #1a2030;
  --ink-700: #232b3f;
  --ink-600: #32405b;
  --paper:    #e8e2d4;   /* aged rice paper */
  --paper-dim:#9aa3b2;
  --vermilion:#c9432e;   /* 朱砂 — primary accent */
  --vermilion-soft:#e0654f;
  --celadon:  #79a08c;   /* 青瓷 — secondary */
  --gold:     #c9a45c;   /* 鎏金 — tertiary */
  --gold-bright:#e6c27a;
  --blessed:  #7fb2a0;
  --danger:   #d0523f;
  --glow:     rgba(201, 67, 46, 0.18);

  --radius:   14px;
  --radius-sm:9px;
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", "Georgia", serif;
  --font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono:  "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--ink-950);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* subtle ink-wash background */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(201,67,46,0.10), transparent 60%),
    radial-gradient(1000px 600px at -10% 110%, rgba(121,160,140,0.08), transparent 55%),
    var(--ink-950);
  z-index: -1;
}

.hidden { display: none !important; }
.muted { color: var(--paper-dim); }

/* ============ LOGIN ============ */
#login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-card {
  width: 100%;
  max-width: 400px;
  background: linear-gradient(160deg, var(--ink-850), var(--ink-900));
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  padding: 44px 40px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.55), 0 0 0 1px rgba(201,67,46,0.08);
}
.login-mark { margin-bottom: 16px; }

/* Seal logo — professional vermilion seal with gold 玄 character */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 600;
  color: #f4e6c8;
  background: linear-gradient(145deg, #c9432e, #9e2f1e);
  border: 1.5px solid rgba(230,194,122,0.55);
  border-radius: 12px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.18),
    inset 0 -2px 0 rgba(0,0,0,0.25),
    0 6px 18px rgba(201,67,46,0.35);
  text-shadow: 0 1px 2px rgba(0,0,0,0.4);
  user-select: none;
}
.login-card h1 {
  font-family: var(--font-serif);
  font-size: 30px;
  letter-spacing: 2px;
  font-weight: 500;
  color: var(--paper);
}
.login-card .sub {
  color: var(--paper-dim);
  font-size: 13px;
  margin: 6px 0 26px;
  letter-spacing: 1px;
}
.login-card input {
  width: 100%;
  background: var(--ink-950);
  border: 1px solid var(--ink-600);
  color: var(--paper);
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.login-card input:focus {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 3px var(--glow);
}
.login-card button {
  width: 100%;
  margin-top: 16px;
  background: linear-gradient(135deg, var(--vermilion), var(--vermilion-soft));
  color: #fff;
  border: none;
  padding: 13px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 1px;
  transition: transform 0.1s, opacity 0.15s;
}
.login-card button:hover { opacity: 0.92; }
.login-card button:active { transform: translateY(1px); }
#login-err {
  color: var(--danger);
  font-size: 13px;
  margin-top: 14px;
  min-height: 18px;
}

/* ============ APP SHELL ============ */
#app {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 22px;
  height: 62px;
  background: rgba(16,20,29,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ink-700);
  flex-shrink: 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}
.brand .mark .seal {
  width: 34px;
  height: 34px;
  font-size: 18px;
  border-radius: 9px;
}
.brand .wordmark {
  font-family: var(--font-serif);
  font-size: 19px;
  letter-spacing: 2px;
  font-weight: 600;
  color: var(--paper);
}
.brand .tag {
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--paper-dim);
  letter-spacing: 2px;
  padding: 2px 9px;
  border: 1px solid var(--ink-600);
  border-radius: 20px;
}
nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}
nav .tab {
  position: relative;
  background: none;
  border: none;
  color: var(--paper-dim);
  padding: 9px 15px;
  font-size: 14px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-family: inherit;
  letter-spacing: 0.5px;
  transition: color 0.15s, background 0.15s;
}
nav .tab:hover { color: var(--paper); background: var(--ink-800); }
nav .tab.active { color: var(--gold-bright); }
nav .tab.active::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 2px;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
}
nav .logout {
  background: none;
  border: 1px solid var(--ink-600);
  color: var(--paper-dim);
  margin-left: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  transition: all 0.15s;
}
nav .logout:hover { border-color: var(--danger); color: var(--danger); }

/* ============ PANELS ============ */
.panel {
  display: none;
  flex: 1;
  overflow: hidden;
  flex-direction: column;
}
.panel.active { display: flex; }

/* Chat panel */
#tab-chat {
  display: none;
}
#tab-chat.active { display: flex; flex-direction: column; }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  scroll-behavior: smooth;
}

.msg {
  max-width: 78%;
  display: flex;
  gap: 12px;
  animation: rise 0.25s ease;
}
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.msg .avatar {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 600;
  background: var(--ink-800);
  border: 1px solid var(--ink-600);
  color: var(--paper-dim);
  user-select: none;
}
.msg .avatar.assistant {
  font-family: var(--font-serif);
  color: #f4e6c8;
  background: linear-gradient(145deg, #c9432e, #9e2f1e);
  border: 1px solid rgba(230,194,122,0.55);
  text-shadow: 0 1px 1px rgba(0,0,0,0.4);
}
.msg .avatar.user {
  background: var(--ink-700);
  border: 1px solid var(--ink-600);
  color: var(--paper);
}
.msg .body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.msg .who {
  font-size: 12px;
  color: var(--paper-dim);
  letter-spacing: 0.5px;
}
.msg .bubble {
  padding: 13px 17px;
  border-radius: var(--radius);
  line-height: 1.65;
  word-wrap: break-word;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.msg.user { align-self: flex-end; flex-direction: row-reverse; }
.msg.user .bubble {
  background: linear-gradient(135deg, var(--vermilion), #b23a27);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.msg.user .who { text-align: right; }

.msg.assistant .bubble {
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  border-bottom-left-radius: 4px;
  color: var(--paper);
}
.msg.assistant .avatar { background: linear-gradient(145deg, #c9432e, #9e2f1e); border-color: rgba(230,194,122,0.55); }

/* markdown-ish styling inside bubbles */
.bubble p { margin: 0 0 8px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble em { color: var(--celadon); }
.bubble strong { color: var(--gold-bright); font-weight: 600; }
.bubble code {
  font-family: var(--font-mono);
  background: var(--ink-950);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--gold);
}
.bubble pre {
  background: var(--ink-950);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-sm);
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
}
.bubble pre code { background: none; padding: 0; }
.bubble ul, .bubble ol { margin: 6px 0; padding-left: 22px; }
.bubble blockquote {
  border-left: 3px solid var(--vermilion);
  padding-left: 12px;
  color: var(--paper-dim);
  margin: 8px 0;
}
.bubble a { color: var(--celadon); }

/* typing indicator */
.typing { display: inline-flex; gap: 4px; padding: 4px 2px; }
.typing span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--paper-dim);
  animation: blink 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%,80%,100% { opacity: 0.2; } 40% { opacity: 1; } }

/* composer */
.composer {
  flex-shrink: 0;
  padding: 14px 22px 18px;
  background: rgba(16,20,29,0.7);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--ink-700);
}
.composer-inner {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  max-width: 900px;
  margin: 0 auto;
}
.composer textarea {
  flex: 1;
  resize: none;
  background: var(--ink-850);
  border: 1px solid var(--ink-600);
  color: var(--paper);
  padding: 13px 16px;
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  line-height: 1.5;
  max-height: 160px;
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.composer textarea:focus {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 3px var(--glow);
}
.composer .icon-btn {
  background: var(--ink-800);
  border: 1px solid var(--ink-600);
  color: var(--paper-dim);
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 18px;
  transition: all 0.15s;
  flex-shrink: 0;
}
.composer .icon-btn:hover { color: var(--gold-bright); border-color: var(--gold); }
.composer .send {
  background: linear-gradient(135deg, var(--vermilion), var(--vermilion-soft));
  border: none;
  color: #fff;
  height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  letter-spacing: 0.5px;
  transition: opacity 0.15s;
  flex-shrink: 0;
}
.composer .send:hover { opacity: 0.9; }
.composer .send:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============ GENERIC PANEL CONTENT ============ */
.panel-inner {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 22px;
  overflow-y: auto;
}
.panel-inner h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 24px;
  margin-bottom: 6px;
  letter-spacing: 1px;
}
.panel-inner .lead { color: var(--paper-dim); margin-bottom: 22px; }

.card {
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gold-bright);
  letter-spacing: 0.5px;
}
.card .muted { font-size: 13px; margin-bottom: 14px; }

.btn {
  background: var(--ink-800);
  border: 1px solid var(--ink-600);
  color: var(--paper);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.15s;
}
.btn:hover { border-color: var(--gold); color: var(--gold-bright); }
.btn.primary { background: linear-gradient(135deg, var(--vermilion), var(--vermilion-soft)); border: none; color: #fff; }
.btn.primary:hover { opacity: 0.9; color: #fff; }

textarea.note, input.text {
  width: 100%;
  background: var(--ink-950);
  border: 1px solid var(--ink-600);
  color: var(--paper);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  margin-bottom: 12px;
}
textarea.note:focus, input.text:focus { border-color: var(--vermilion); }

/* upload drop zone */
.drop-zone {
  border: 2px dashed var(--ink-600);
  border-radius: var(--radius);
  padding: 34px;
  text-align: center;
  color: var(--paper-dim);
  transition: all 0.2s;
  cursor: pointer;
  margin-bottom: 20px;
}
.drop-zone.drag { border-color: var(--vermilion); background: var(--glow); color: var(--paper); }

/* document list */
.doc-list { display: flex; flex-direction: column; gap: 8px; }
.doc-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--ink-850);
  border: 1px solid var(--ink-700);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}
.doc-item .icon { font-size: 20px; }
.doc-item .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-item .size { color: var(--paper-dim); font-size: 12px; font-family: var(--font-mono); }
.doc-item .d-btn {
  background: none; border: none; color: var(--paper-dim);
  cursor: pointer; font-size: 16px; padding: 4px 8px; border-radius: 6px;
}
.doc-item .d-btn:hover { color: var(--danger); background: var(--ink-800); }

/* status output */
.status-output {
  background: var(--ink-900);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--celadon);
}

.progress { color: var(--gold); font-size: 13px; margin-top: 10px; }

/* scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--ink-700); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--ink-600); }

@media (max-width: 640px) {
  .msg { max-width: 92%; }
  nav .tab span { display: none; }
  nav .tab { padding: 9px 11px; }
}