/* 领路人 Mentor — design system
   Kin of the DoubleMi family (ink black base) — accent is lantern amber, not seal red. */
:root{
  --bg:#16171A;
  --bg-deep:#101114;
  --panel:#1C1D21;
  --cream:#ECEAE3;
  --muted:#9C9C93;
  --faint:#6E6E67;
  --amber:#C9A227;
  --amber-deep:#9A7B1B;
  --hair:rgba(236,234,227,0.16);
  --hair-soft:rgba(236,234,227,0.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--cream);
  font-family:"Instrument Sans","Noto Sans SC",-apple-system,"PingFang SC",sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.75;min-height:100vh;
}
::selection{background:var(--amber);color:var(--bg)}
.serif{font-family:"Cormorant Garamond",Georgia,serif}
.wrap{max-width:760px;margin:0 auto;padding:0 22px}

nav{display:flex;justify-content:space-between;align-items:center;padding:22px 0;border-bottom:1px solid var(--hair-soft)}
nav .nav-mark{font-family:"Cormorant Garamond",serif;font-style:italic;font-size:18px;color:var(--cream);text-decoration:none;letter-spacing:.04em}
nav .nav-mark .cn{font-family:"Noto Serif SC",serif;font-style:normal;font-size:15px;color:var(--muted);margin-left:8px}
nav .nav-right{display:flex;gap:16px;align-items:center;font-size:13px}
nav a,nav button.linkish{color:var(--muted);text-decoration:none;background:none;border:none;font-family:inherit;font-size:13px;cursor:pointer;letter-spacing:.08em;transition:color .3s}
nav a:hover,nav button.linkish:hover{color:var(--cream)}

header.hero{padding:80px 0 56px;text-align:center}
h1{font-family:"Cormorant Garamond",Georgia,serif;font-style:italic;font-weight:500;font-size:clamp(40px,6vw,64px);line-height:1.1}
h1 .cn{font-family:"Noto Serif SC",serif;font-style:normal;font-weight:400;font-size:.58em;display:block;margin-top:14px;letter-spacing:.3em;color:var(--muted)}
.kicker{font-size:12px;letter-spacing:.34em;text-transform:uppercase;color:var(--amber);margin-bottom:24px}
.hero-tag{margin:26px auto 0;max-width:520px;color:var(--muted);font-size:15.5px}
.hero-tag em{font-family:"Cormorant Garamond",serif;color:var(--cream);font-size:1.06em}

.btn{appearance:none;border:1px solid var(--cream);background:var(--cream);color:var(--bg);font-family:inherit;font-size:13px;letter-spacing:.14em;padding:12px 24px;cursor:pointer;border-radius:2px;transition:opacity .25s;text-decoration:none;display:inline-block}
.btn:hover{opacity:.85}
.btn-ghost{background:transparent;color:var(--cream);border-color:var(--hair)}
.btn-ghost:hover{border-color:var(--cream);opacity:1}
.btn-amber{background:var(--amber);border-color:var(--amber);color:#171408}
.btn[disabled]{opacity:.4;cursor:not-allowed}
.btn-ghost.listening{border-color:var(--amber);color:var(--amber)}

.field{width:100%;background:transparent;border:1px solid var(--hair);border-radius:2px;color:var(--cream);font-family:"Noto Serif SC",serif;font-size:15.5px;padding:13px 16px;outline:none;transition:border-color .3s}
.field:focus{border-color:var(--amber)}
textarea.field{resize:vertical;min-height:88px;line-height:1.7}

.card{background:var(--panel);border:1px solid var(--hair-soft);border-radius:4px;padding:30px}
.sec-label{font-size:11px;letter-spacing:.3em;text-transform:uppercase;color:var(--faint);margin-bottom:12px}
.note{color:var(--faint);font-size:12.5px;line-height:1.7}

/* ---------- chat ---------- */
.chat{display:flex;flex-direction:column;gap:18px;padding:28px 0 140px}
.msg{max-width:92%;font-size:15.5px;white-space:pre-wrap}
.msg.user{align-self:flex-end;background:var(--panel);border:1px solid var(--hair-soft);border-radius:6px 6px 2px 6px;padding:12px 16px;color:var(--cream)}
.msg.mentor{align-self:flex-start;color:var(--cream)}
.msg.mentor::before{content:"领路人";display:block;font-size:11px;letter-spacing:.3em;color:var(--amber);margin-bottom:6px}
.msg.thinking{color:var(--faint);font-style:italic}
.composer{position:fixed;left:0;right:0;bottom:0;background:linear-gradient(transparent,var(--bg) 26%);padding:34px 0 22px}
.composer-inner{display:flex;gap:10px;align-items:flex-end}
.composer textarea{flex:1;min-height:52px;max-height:180px;background:var(--panel)}
.hidden{display:none !important}

.home-actions{display:grid;gap:14px;margin-top:26px}
.home-actions .btn{text-align:center;padding:16px}
.arc-view{white-space:pre-wrap;font-family:"Noto Serif SC",serif;font-size:14.5px;line-height:1.9;color:var(--cream);background:var(--bg-deep);border:1px solid var(--hair-soft);border-radius:4px;padding:26px;max-height:70vh;overflow-y:auto}
.hair-rule{width:64px;height:1px;background:var(--hair);margin:40px auto}
footer{padding:44px 0 60px;text-align:center;color:var(--faint);font-size:12px}
footer a{color:var(--muted);text-decoration:none}
.toast{position:fixed;top:18px;left:50%;transform:translateX(-50%);background:var(--panel);border:1px solid var(--hair);border-radius:4px;padding:10px 20px;font-size:13.5px;z-index:50}

/* ---------- journey panel ---------- */
.j-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:6px 0 20px;text-align:center}
.j-num{font-family:"Cormorant Garamond",serif;font-size:34px;line-height:1.1;color:var(--cream)}
.j-cap{font-size:11.5px;color:var(--faint);letter-spacing:.06em;margin-top:2px}
.j-curve-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}
#sparkline svg{display:block}

/* ---------- energy modal ---------- */
.modal{position:fixed;inset:0;background:rgba(10,10,12,.72);display:flex;align-items:center;justify-content:center;z-index:60}
.energy-row{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:6px}
.energy-btn{appearance:none;background:transparent;border:1px solid var(--hair);border-radius:3px;color:var(--cream);font-family:inherit;font-size:14px;padding:10px 0;cursor:pointer;transition:all .15s}
.energy-btn:hover{border-color:var(--amber);color:var(--amber)}

/* ---------- rendered markdown ---------- */
.md{white-space:normal}
.md h1{font-family:"Cormorant Garamond","Noto Serif SC",serif;font-style:normal;font-size:24px;margin:0 0 18px;line-height:1.3}
.md h2{font-size:17px;color:var(--amber);margin:26px 0 10px;font-weight:600}
.md h3{font-size:15.5px;margin:18px 0 8px;font-weight:600}
.md p{margin:0 0 12px}
.md ul,.md ol{margin:0 0 14px;padding-left:22px}
.md li{margin-bottom:6px}
.md blockquote{border-left:2px solid var(--amber);padding-left:14px;color:var(--muted);margin:0 0 14px}
.md strong{color:var(--cream)}
.md em{color:var(--muted)}
.md hr{border:none;border-top:1px solid var(--hair-soft);margin:22px 0}
.md code{background:var(--bg-deep);padding:1px 6px;border-radius:3px;font-size:.9em}

/* ---------- echo gallery 回音廊 ---------- */
.echo-grid{display:grid;gap:16px;margin-top:26px}
.echo-card{background:var(--panel);border:1px solid var(--hair-soft);border-radius:4px;padding:24px 26px}
.echo-text{font-family:"Noto Serif SC",serif;font-size:15px;line-height:1.9;white-space:pre-wrap;color:var(--cream)}
.echo-foot{display:flex;justify-content:space-between;align-items:center;margin-top:16px}
.echo-pen{font-size:12px;letter-spacing:.14em;color:var(--faint)}
.walk-btn{display:inline-flex;align-items:center;gap:7px;background:none;border:1px solid var(--hair);border-radius:999px;color:var(--muted);font-family:inherit;font-size:12px;letter-spacing:.06em;padding:6px 14px;cursor:pointer;transition:all .25s}
.walk-btn:hover{border-color:var(--cream);color:var(--cream)}
.walk-btn.lit{border-color:var(--amber);color:var(--amber);cursor:default}
.echo-mine{border-left:2px solid var(--amber)}
.echo-status{font-size:11px;letter-spacing:.14em;color:var(--faint);text-transform:uppercase}
.echo-status.live{color:var(--amber)}
.linkish-danger{background:none;border:none;color:var(--faint);font-family:inherit;font-size:12px;cursor:pointer;letter-spacing:.06em}
.linkish-danger:hover{color:var(--cream)}

.lang-toggle{background:none;border:1px solid var(--hair);border-radius:999px;color:var(--muted);font-family:inherit;font-size:11.5px;letter-spacing:.08em;padding:4px 11px;cursor:pointer;transition:all .25s}
.lang-toggle:hover{color:var(--cream);border-color:var(--cream)}
@media (max-width:640px){ header.hero{padding:56px 0 40px} .card{padding:22px} }