/* RAG Регламенты РЦБ — Financial light theme */
:root {
  --nav-bg:   #0a1f44;
  --bg:       #f4f6f9;
  --card:     #ffffff;
  --border:   #dde3ed;
  --accent:   #0a52a8;
  --accent-h: #083d80;
  --green:    #00845a;
  --gold:     #b8760a;
  --text:     #0d1b2e;
  --muted:    #4a5e75;
  --dim:      #8a9db8;
  --shadow:   0 1px 4px rgba(0,30,70,.07), 0 4px 16px rgba(0,30,70,.05);
  --radius:   8px;
  --font:     -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);font-size:15px;line-height:1.6;height:100vh;display:flex;flex-direction:column;overflow:hidden}
a{color:inherit;text-decoration:none}

/* ── NAV ─────────────────────────────────────────────────────── */
nav{background:var(--nav-bg);padding:0 24px;height:56px;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;box-shadow:0 2px 12px rgba(0,0,0,.18)}
.nav-logo{font-size:15px;font-weight:800;color:#fff;letter-spacing:-.3px}
.nav-logo span{color:#6baee8}
.nav-meta{display:flex;align-items:center;gap:16px}
.nav-docs-count{font-size:12px;color:rgba(255,255,255,.45)}
.nav-docs-count b{color:rgba(255,255,255,.75)}

/* ── LAYOUT ──────────────────────────────────────────────────── */
.app{display:flex;flex:1;overflow:hidden}

/* ── SIDEBAR ─────────────────────────────────────────────────── */
.sidebar{width:280px;flex-shrink:0;background:var(--card);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}
.sidebar-section{padding:16px;border-bottom:1px solid var(--border)}
.sidebar-label{font-size:10px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--dim);margin-bottom:10px}

/* API settings */
.api-select,.api-input{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:13px;color:var(--text);background:#fff;margin-bottom:8px;outline:none;transition:border-color .15s}
.api-select:focus,.api-input:focus{border-color:var(--accent)}
.api-key-wrap{position:relative}
.api-key-wrap input{padding-right:36px}
.api-key-toggle{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;font-size:14px;color:var(--dim)}

/* Documents list */
.doc-toggle-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:2px}
.doc-toggle-hint{font-size:10.5px;color:var(--dim);line-height:1.4;max-width:160px}
.doc-toggle-all{background:none;border:1px solid var(--border);border-radius:4px;font-size:10px;color:var(--muted);padding:2px 7px;cursor:pointer;white-space:nowrap;transition:all .15s;flex-shrink:0}
.doc-toggle-all:hover{border-color:var(--accent);color:var(--accent)}
.doc-list{flex:1;overflow-y:auto;padding:8px 0}
.doc-item{display:flex;align-items:center;gap:9px;padding:7px 16px;font-size:12.5px;color:var(--muted);cursor:pointer;border-left:3px solid transparent;transition:all .15s}
.doc-item:hover{background:rgba(10,82,168,.04);color:var(--text);border-left-color:var(--accent)}
.doc-cb{accent-color:var(--accent);width:13px;height:13px;flex-shrink:0;cursor:pointer}
.doc-item-icon{font-size:13px;flex-shrink:0}
.doc-item-name{line-height:1.3}

/* Top-K slider */
.topk-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.topk-label{font-size:12px;color:var(--muted)}
.topk-val{font-size:12px;font-weight:700;color:var(--accent)}
input[type=range]{width:100%;accent-color:var(--accent)}
.topk-hint{font-size:11px;color:var(--dim);margin-top:5px}
.no-docs-warning{margin:0 12px 4px;padding:8px 10px;background:#fff8e1;border:1px solid #f59e0b;border-radius:6px;font-size:11.5px;color:#92400e;line-height:1.4}
.free-mode-note{padding:8px 12px;background:#fff8e1;border:1px solid #f59e0b;border-radius:8px;font-size:12px;color:#92400e;line-height:1.4;margin-bottom:6px}

/* ── MAIN CHAT ───────────────────────────────────────────────── */
.chat-area{flex:1;display:flex;flex-direction:column;overflow:hidden}

.messages{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:20px}

/* Welcome screen */
.welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:40px}
.welcome-icon{font-size:48px;margin-bottom:16px}
.welcome h2{font-size:22px;font-weight:800;color:var(--text);margin-bottom:8px}
.welcome p{font-size:14px;color:var(--muted);max-width:440px;line-height:1.7;margin-bottom:24px}
.sample-questions{display:flex;flex-direction:column;gap:8px;width:100%;max-width:440px}
.sample-q{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:10px 14px;font-size:13px;color:var(--muted);cursor:pointer;text-align:left;transition:all .15s}
.sample-q:hover{border-color:var(--accent);color:var(--accent);background:rgba(10,82,168,.04)}

/* Messages */
.msg{display:flex;gap:12px;align-items:flex-start}
.msg.user{flex-direction:row-reverse}
.msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;font-weight:700}
.msg.user .msg-avatar{background:var(--accent);color:#fff}
.msg.assistant .msg-avatar{background:var(--nav-bg);color:#6baee8}
.msg-body{max-width:72%;display:flex;flex-direction:column;gap:8px}
.msg.user .msg-body{align-items:flex-end}

.msg-bubble{padding:12px 16px;border-radius:12px;font-size:14px;line-height:1.65}
.msg.user .msg-bubble{background:var(--accent);color:#fff;border-bottom-right-radius:4px}
.msg.assistant .msg-bubble{background:var(--card);border:1px solid var(--border);color:var(--text);border-bottom-left-radius:4px}
.msg.assistant .msg-bubble.markdown p{margin-bottom:.6em}
.msg.assistant .msg-bubble.markdown p:last-child{margin-bottom:0}
.msg.assistant .msg-bubble.markdown strong{font-weight:700}
.msg.assistant .msg-bubble.markdown ul,.msg.assistant .msg-bubble.markdown ol{padding-left:1.3em;margin:.3em 0}
.msg.assistant .msg-bubble.markdown li{margin:.2em 0}
.msg.assistant .msg-bubble.markdown h1,.msg.assistant .msg-bubble.markdown h2,.msg.assistant .msg-bubble.markdown h3{font-weight:700;margin:.6em 0 .2em}

/* Sources */
.sources{display:flex;flex-direction:column;gap:6px}
.sources-label{font-size:10px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--dim)}
.source-card{background:var(--card);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:6px;padding:10px 12px;font-size:12px;cursor:pointer;transition:border-color .15s}
.source-card:hover{border-left-color:var(--green)}
.source-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}
.source-doc{font-weight:700;color:var(--text);font-size:11.5px}
.source-score{font-size:10px;color:var(--green);font-weight:700}
.source-article{font-size:11px;color:var(--accent);margin-bottom:4px}
.source-text{color:var(--muted);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.source-card.expanded .source-text{-webkit-line-clamp:unset}

/* Loading */
.msg-loading .msg-bubble{display:flex;align-items:center;gap:6px;color:var(--muted)}
.dot{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:bounce .9s infinite}
.dot:nth-child(2){animation-delay:.15s}
.dot:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,80%,100%{transform:scale(0.6);opacity:.4}40%{transform:scale(1);opacity:1}}

/* Error */
.msg-error .msg-bubble{background:#fff5f5;border-color:#fecaca;color:#b91c1c}

/* ── INPUT BAR ───────────────────────────────────────────────── */
.input-bar{padding:16px 24px;background:var(--card);border-top:1px solid var(--border);flex-shrink:0}
.input-wrap{display:flex;gap:10px;align-items:flex-end;background:#fff;border:1.5px solid var(--border);border-radius:10px;padding:10px 14px;transition:border-color .15s}
.input-wrap:focus-within{border-color:var(--accent)}
#question{flex:1;border:none;outline:none;font-family:var(--font);font-size:14.5px;color:var(--text);resize:none;max-height:120px;line-height:1.5;background:transparent}
#question::placeholder{color:var(--dim)}
.send-btn{background:var(--accent);border:none;border-radius:7px;color:#fff;cursor:pointer;font-size:18px;padding:6px 12px;transition:background .15s;flex-shrink:0;line-height:1}
.send-btn:hover{background:var(--accent-h)}
.send-btn:disabled{background:var(--dim);cursor:not-allowed}
.input-hint{font-size:11px;color:var(--dim);margin-top:6px;text-align:center}

/* ── UPLOAD BUTTON ───────────────────────────────────────────── */
.upload-section{padding:12px 16px;border-top:1px solid var(--border);flex-shrink:0}
.upload-btn{width:100%;padding:9px 12px;border:1.5px dashed var(--border);border-radius:8px;background:transparent;color:var(--muted);font-size:12.5px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:6px}
.upload-btn:hover{border-color:var(--accent);color:var(--accent);background:rgba(10,82,168,.04)}
.upload-btn-icon{font-size:16px;font-weight:300;line-height:1}

/* ── MODAL ───────────────────────────────────────────────────── */
.modal-overlay{position:fixed;inset:0;background:rgba(0,10,30,.45);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;z-index:1000}
.modal-card{background:#fff;border-radius:16px;padding:36px 32px;width:360px;max-width:90vw;text-align:center;box-shadow:0 8px 40px rgba(0,20,60,.18);display:flex;flex-direction:column;align-items:center;gap:12px}

/* Spinner */
.modal-spinner-wrap{display:flex;align-items:center;justify-content:center;width:64px;height:64px}
.modal-spinner{width:48px;height:48px;border:4px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .75s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* Icon (success / error) */
.modal-icon{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;color:#fff;line-height:1}
.modal-card--success .modal-icon{background:#00845a}
.modal-card--error   .modal-icon{background:#dc2626}

.modal-title{font-size:17px;font-weight:800;color:var(--text)}
.modal-stage{font-size:13px;color:var(--muted);line-height:1.5;max-width:280px}
.modal-sub{font-size:12px;color:var(--dim);line-height:1.4;max-width:280px}

.modal-close-btn{margin-top:4px;padding:9px 28px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s}
.modal-close-btn:hover{background:var(--accent-h)}

/* ── SCROLLBAR ───────────────────────────────────────────────── */
::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}

@media(max-width:680px){
  .sidebar{display:none}
  .messages{padding:16px}
}