/* ── ThinkNote · style.css · Minimal Cobalt ── */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;1,8..60,400&display=swap');

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

/* ── Lucide global stroke-width 1.5 ── */
svg.lucide { stroke-width: 1.5 !important; }

/* ── Design tokens ── */
:root {
  --cobalt:       #1a56d6;
  --cobalt-dim:   #1448b8;
  --cobalt-pale:  #e8f0fe;
  --cobalt-rgb:   26, 86, 214;

  --radius-s: 5px;
  --radius-m: 8px;
  --radius-l: 12px;

  --recent-w:   240px;
  --topbar-h:   52px;
  --chat-h:     68px;
  --settings-w: 300px;

  --ease: cubic-bezier(.4,0,.2,1);
  --t:    180ms;
  --t-slow: 320ms;
}

/* Dark */
[data-theme="dark"] {
  --bg:        #0d0f14;
  --surface:   #141720;
  --surface-2: #1c2030;
  --surface-h: #222638;
  --border:    rgba(255,255,255,.07);
  --border-s:  rgba(26,86,214,.5);
  --t1:        #e2e6f0;
  --t2:        #8a91a8;
  --t3:        #464d66;
  --shadow:    0 2px 16px rgba(0,0,0,.5);
  --conn:      rgba(26,86,214,.4);
  --overlay-c: rgba(0,0,0,.6);
  --sb:        rgba(255,255,255,.06);
}

/* Light */
[data-theme="light"] {
  --bg:        #f3f4f8;
  --surface:   #ffffff;
  --surface-2: #f8f9fc;
  --surface-h: #f0f2fa;
  --border:    rgba(0,0,0,.08);
  --border-s:  rgba(26,86,214,.4);
  --t1:        #0f1117;
  --t2:        #5a6278;
  --t3:        #a0a8be;
  --shadow:    0 1px 8px rgba(0,0,0,.08);
  --conn:      rgba(26,86,214,.35);
  --overlay-c: rgba(0,0,0,.3);
  --sb:        rgba(0,0,0,.08);
}

/* ── Base ── */
html, body {
  height: 100%; overflow: hidden;
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 14px; line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  color: var(--t1);
  transition: background var(--t-slow) var(--ease), color var(--t-slow) var(--ease);
}

/* ── Layout ── */
#app {
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* ── App Loader ── */
.app-loader {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bg); display: flex; align-items: center; justify-content: center;
  transition: opacity .5s var(--ease), visibility .5s;
}
.app-loader.hidden { opacity: 0; visibility: hidden; }
.pulse-logo {
  width: 48px; height: 48px; color: var(--cobalt);
  animation: pulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .5; transform: scale(0.9); }
}

/* ── Recent panel ── */
.recent-panel {
  width: var(--recent-w);
  min-width: var(--recent-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  transition: width var(--t-slow) var(--ease), min-width var(--t-slow) var(--ease);
  z-index: 10;
}
.recent-panel.collapsed { width: 0; min-width: 0; }

/* ── Ask Panel ── */
.ask-panel {
  width: 320px;
  min-width: 320px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  transition: width var(--t-slow) var(--ease), min-width var(--t-slow) var(--ease), padding var(--t-slow) var(--ease);
  z-index: 10;
}
.ask-panel.collapsed { width: 0; min-width: 0; border-left: none; }
.ask-body {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 16px;
}
.ask-body::-webkit-scrollbar { width: 4px; }
.ask-body::-webkit-scrollbar-thumb { background: var(--sb); border-radius: 2px; }

.ask-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 12px;
  animation: drIn .22s var(--ease) both;
}
.ask-q { font-size: 13px; font-weight: 600; color: var(--t1); margin-bottom: 6px; }
.ask-a { font-size: 13px; color: var(--t2); line-height: 1.6; word-break: break-word; }
.ask-a p { margin-bottom: 8px; }
.ask-a p:last-child { margin-bottom: 0; }
.ask-a ul, .ask-a ol { padding-left: 18px; margin-bottom: 8px; }
.ask-a pre { background: var(--surface); padding: 8px; border-radius: 4px; overflow-x: auto; margin-bottom: 8px; }
.ask-a code { font-family: monospace; background: var(--surface); padding: 2px 4px; border-radius: 3px; }


.panel-hd {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.panel-hd-left { display: flex; align-items: center; gap: 7px; }
.panel-hd-left i { color: var(--cobalt); width: 15px; height: 15px; }
.panel-title {
  font-size: 11px; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--t2); white-space: nowrap;
}

.new-note-btn {
  display: flex; align-items: center; gap: 8px;
  margin: 10px 10px 8px;
  padding: 8px 11px;
  background: var(--surface-2);
  color: var(--t2);
  border: 1px solid var(--border); border-radius: var(--radius-m);
  font-family: inherit; font-size: 12px; font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  width: calc(100% - 20px);
  transition: background var(--t) var(--ease), color var(--t) var(--ease),
              border-color var(--t) var(--ease);
}
.new-note-btn:hover  { background: var(--surface-h); color: var(--t1); border-color: var(--border-s); }
.new-note-btn:active { background: var(--cobalt); color: #fff; border-color: var(--cobalt); }
.new-note-btn .nb-icon {
  width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; opacity: .75;
}
.new-note-btn:active .nb-icon { opacity: 1; }
.new-note-btn .nb-icon i { width: 13px; height: 13px; }
.new-note-btn .nb-label { flex: 1; text-align: left; }
.new-note-btn .nb-logo {
  width: 14px; height: 14px; color: var(--t3); display: flex; opacity: 0.6;
}
.new-note-btn:hover .nb-logo { color: var(--cobalt); opacity: 1; }
.new-note-btn:active .nb-logo { color: #fff; opacity: .8; }

.sessions-list {
  flex: 1; overflow-y: auto; padding: 4px 6px 6px;
}
.sessions-list::-webkit-scrollbar { width: 3px; }
.sessions-list::-webkit-scrollbar-thumb { background: var(--sb); border-radius: 2px; }

.s-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 8px;
  border-radius: var(--radius-m);
  cursor: pointer;
  position: relative;
  transition: background var(--t) var(--ease);
}
.s-item:hover { background: var(--surface-h); }
.s-item.active { background: var(--cobalt-pale); }
[data-theme="dark"] .s-item.active { background: rgba(var(--cobalt-rgb),.12); }
.s-item.active::before {
  content: '';
  position: absolute; left: 0; top: 20%; bottom: 20%;
  width: 2px; background: var(--cobalt); border-radius: 0 2px 2px 0;
}
.s-icon { width: 28px; height: 28px; border-radius: var(--radius-s); background: var(--surface-2); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.s-icon i { width: 13px; height: 13px; color: var(--cobalt); }
.s-info  { flex: 1; overflow: hidden; }
.s-name  { font-size: 12px; font-weight: 500; color: var(--t1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.s-date  { font-size: 10px; color: var(--t3); margin-top: 1px; }
.s-del {
  width: 22px; height: 22px;
  background: none; border: none; color: var(--t3);
  cursor: pointer; border-radius: var(--radius-s);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--t), color var(--t), background var(--t);
  flex-shrink: 0;
}
.s-del i { width: 12px; height: 12px; }
.s-item:hover .s-del { opacity: 1; }
.s-del:hover { color: #dc2626; background: rgba(220,38,38,.1); }

/* ── Main ── */
#main { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }

/* ── Topbar ── */
.topbar {
  height: var(--topbar-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0; gap: 12px;
}
.tb-left  { display: flex; align-items: center; gap: 10px; min-width: 0; flex: 1; }
.tb-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.logo { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.logo-icon {
  width: 26px; height: 26px;
  background: var(--cobalt);
  border-radius: var(--radius-s);
  display: flex; align-items: center; justify-content: center;
}
.logo-icon i { width: 14px; height: 14px; color: #fff; }
.logo-name { font-size: 14px; font-weight: 600; color: var(--t1); white-space: nowrap; }

.divv { width: 1px; height: 18px; background: var(--border); flex-shrink: 0; }

.session-title {
  font-size: 13px; font-weight: 500; color: var(--t2);
  outline: none; cursor: text;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 240px;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--t), border-color var(--t);
}
.session-title:focus { color: var(--t1); border-color: var(--cobalt); }

/* Buttons */
.ib {
  width: 32px; height: 32px;
  background: none; border: none; border-radius: var(--radius-s);
  color: var(--t2); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--t), color var(--t);
  flex-shrink: 0;
}
.ib i { width: 16px; height: 16px; }
.ib svg { width: 16px; height: 16px; stroke-width: 1.5; }
.ib:hover { background: var(--surface-h); color: var(--t1); }

/* Settings action buttons — icon only, wider for comfort */
.set-action-btn {
  width: 42px; height: 34px;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  flex: 1;
}
.set-action-btn:hover { border-color: var(--border-s); }
#save-btn { background: rgba(var(--cobalt-rgb),.12); color: var(--cobalt); border-color: rgba(var(--cobalt-rgb),.3); }
#save-btn:hover { background: var(--cobalt); color: #fff; border-color: var(--cobalt); }

/* Export dropdown */
.export-wrap { position: relative; }
.dropdown {
  position: absolute; top: calc(100% + 5px); right: 0;
  min-width: 180px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow);
  z-index: 100; overflow: hidden;
  animation: dropIn var(--t) var(--ease);
}
@keyframes dropIn { from{opacity:0;transform:translateY(-4px)} to{opacity:1;transform:translateY(0)} }
.dd-item {
  display: flex; align-items: center; gap: 9px;
  width: 100%; padding: 9px 12px;
  background: none; border: none; text-align: left;
  color: var(--t1); font-family: inherit; font-size: 12px;
  cursor: pointer;
  transition: background var(--t);
}
.dd-item i { width: 14px; height: 14px; color: var(--t2); flex-shrink: 0; }
.dd-item:hover { background: var(--surface-h); }

/* ── Document view ── */
#doc-wrap {
  flex: 1;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

.tree-empty {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 12px; padding: 40px;
  text-align: center; pointer-events: none;
  z-index: 1;
}
.empty-icon {
  width: 52px; height: 52px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--cobalt); opacity: .7;
}
.empty-title { font-size: 15px; font-weight: 600; color: var(--t2); }
.empty-sub { font-size: 12px; color: var(--t3); max-width: 300px; line-height: 1.65; }

#doc-view {
  flex: 1;
  overflow-y: auto;
  padding: 28px 36px 40px;
  scroll-behavior: smooth;
}
#doc-view::-webkit-scrollbar { width: 5px; }
#doc-view::-webkit-scrollbar-thumb { background: var(--sb); border-radius: 3px; }

/* ── Document row ── */
.dr {
  display: flex;
  align-items: flex-start;
  padding: 3px 0;
  position: relative;
  animation: drIn .22s var(--ease) both;
}
@keyframes drIn { from{opacity:0;transform:translateY(5px)} to{opacity:1;transform:translateY(0)} }

/* Guide column — one 24px span per ancestor depth */
.dr-guides { display: flex; align-self: stretch; flex-shrink: 0; }

.g {
  width: 24px;
  flex-shrink: 0;
  position: relative;
  align-self: stretch;
}
/* │ — ancestor has more siblings below */
.g-pass::before {
  content: '';
  position: absolute;
  left: 11px; top: 0; bottom: 0;
  width: 1px;
  background: var(--conn);
}
/* └─ — last child */
.g-end::before {
  content: '';
  position: absolute;
  left: 11px; top: 0; bottom: 50%;
  width: 24px;
  border-left: 1px solid var(--conn);
  border-bottom: 1px solid var(--conn);
  border-bottom-left-radius: 12px;
}
.g-end::after {
  display: none;
}
/* ├─ — not last child */
.g-tee::before {
  content: '';
  position: absolute;
  left: 11px; top: 0; bottom: 0;
  width: 1px;
  background: var(--conn);
}
.g-tee::after {
  content: '';
  position: absolute;
  left: 11px; top: 0; bottom: 50%;
  width: 24px;
  border-left: 1px solid var(--conn);
  border-bottom: 1px solid var(--conn);
  border-bottom-left-radius: 12px;
}
/* empty — ancestor line ended */
.g-empty::before { display: none; }

/* Stem connecting parent dot to children */
.dr-stem {
  position: absolute;
  top: 25px;
  bottom: 0;
  width: 1px;
  background: var(--conn);
  z-index: 0;
}

/* Dot */
.dr-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 18px;
  margin-left: 7px;
  border: 2px solid var(--cobalt);
  background: var(--bg);
  transition: background var(--t);
  position: relative;
  z-index: 1;
}
.dr:hover .dr-dot { background: var(--cobalt); }
.dr-dot.d0 { border-color: #1a56d6; width: 10px; height: 10px; margin-top: 17px; margin-left: 6px; background: #1a56d6; }
.dr-dot.d1 { border-color: #3b74e0; }
.dr-dot.d2 { border-color: #6295e8; }
.dr-dot.d3 { border-color: #89b1ef; }
.dr-dot.d4 { border-color: #b0cdf6; }

/* Body */
.dr-body {
  flex: 1;
  padding: 6px 0 6px 10px;
  min-width: 0;
}
.dr-meta {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 3px;
}
.dr-level {
  font-size: 9px; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--cobalt); opacity: .75;
}
.dr-time { font-size: 10px; color: var(--t3); }
.dr-text {
  font-size: 14.5px; color: var(--t1);
  font-family: var(--note-font, 'Source Serif 4', Georgia, serif);
  line-height: 1.75; word-break: break-word;
  font-weight: 400;
}

/* Conflict override badge */
.dr-conflict {
  display: inline-flex; align-items: center; gap: 4px;
  margin-top: 4px;
  font-size: 10px; font-family: 'Inter', sans-serif;
  color: #f59e0b;
  background: rgba(245,158,11,.1);
  border: 1px solid rgba(245,158,11,.25);
  border-radius: 4px;
  padding: 2px 6px;
}
.dr-conflict i { width: 10px; height: 10px; }

/* ── Chat bar ── */
.chat-bar {
  min-height: var(--chat-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 16px env(safe-area-inset-bottom);
  flex-shrink: 0;
}
.chat-inner {
  display: flex; align-items: center;
  gap: 10px; width: 100%;
  max-width: 860px; margin: 0 auto;
}

.ai-pip {
  width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0;
  background: var(--t3);
  transition: background .3s, box-shadow .3s;
}
.ai-pip.ready   { background: #22c55e; box-shadow: 0 0 5px #22c55e; }
.ai-pip.working { background: #f59e0b; box-shadow: 0 0 5px #f59e0b; animation: pip .9s infinite; }
.ai-pip.err     { background: #ef4444; box-shadow: 0 0 5px #ef4444; }
@keyframes pip { 0%,100%{opacity:1} 50%{opacity:.3} }

#thought-input {
  flex: 1;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 9px 16px;
  color: var(--t1);
  font-family: inherit; font-size: 13px;
  resize: none; outline: none;
  max-height: 100px; scrollbar-width: thin;
  transition: border-color var(--t);
}
#thought-input:focus { border-color: var(--border-s); }
#thought-input::placeholder { color: var(--t3); }

/* Ask Toggle */
.ask-toggle {
  display: flex; align-items: center; gap: 6px;
  cursor: pointer; font-size: 12px; font-weight: 500; color: var(--t2);
  user-select: none; transition: color var(--t);
  border: 1px solid var(--border);
  border-radius: 16px; padding: 4px 10px; background: var(--surface);
}
.ask-toggle:hover { color: var(--t1); background: var(--surface-h); }
.ask-toggle input { display: none; }
.ask-toggle:has(input:checked) { color: var(--cobalt); background: var(--cobalt-pale); border-color: var(--cobalt); }
[data-theme="dark"] .ask-toggle:has(input:checked) { background: rgba(var(--cobalt-rgb),.15); }

.send-btn {
  width: 36px; height: 36px;
  background: var(--cobalt); border: none; border-radius: var(--radius-m);
  color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: background var(--t), transform var(--t);
}
.send-btn i { width: 15px; height: 15px; }
.send-btn:hover { background: var(--cobalt-dim); transform: scale(1.04); }
.send-btn:active { transform: scale(.97); }
.send-btn:disabled { opacity: .38; cursor: not-allowed; transform: none; }

/* ── Settings ── */
.ovl {
  position: fixed; inset: 0;
  background: var(--overlay-c);
  z-index: 40;
  backdrop-filter: blur(1px);
  animation: fi var(--t) var(--ease);
}
@keyframes fi { from{opacity:0} to{opacity:1} }

.settings-drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: var(--settings-w);
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  z-index: 50;
  transform: translateX(100%);
  transition: transform var(--t-slow) var(--ease);
  overflow-y: auto;
}
.settings-drawer.open { transform: translateX(0); }

.set-body { padding: 14px; display: flex; flex-direction: column; gap: 18px; }
.set-sec  { display: flex; flex-direction: column; gap: 7px; }
.set-lbl  {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 600; letter-spacing: .07em; text-transform: uppercase; color: var(--t2);
}
.set-lbl i { width: 13px; height: 13px; color: var(--cobalt); opacity: .8; flex-shrink: 0; }

.field {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  padding: 8px 11px;
  color: var(--t1);
  font-family: inherit; font-size: 12px;
  outline: none;
  transition: border-color var(--t);
  appearance: none;
}
.field:focus { border-color: var(--border-s); }
select.field {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a91a8' stroke-width='1.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
  padding-right: 28px;
}
.field-hint { font-size: 11px; color: var(--t3); line-height: 1.55; }
.field-hint code { font-family: monospace; font-size: 10px; }

.set-actions { display: flex; gap: 7px; }

.conn-msg { font-size: 12px; min-height: 18px; }
.conn-msg.ok   { color: #22c55e; }
.conn-msg.fail { color: #ef4444; }
.conn-msg.wait { color: #f59e0b; }

/* ── Toasts ── */
#toasts {
  position: fixed; bottom: 80px; right: 14px;
  display: flex; flex-direction: column; gap: 7px;
  z-index: 200; pointer-events: none;
}
.toast {
  padding: 9px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  color: var(--t1); font-size: 12px;
  box-shadow: var(--shadow);
  animation: tIn .2s var(--ease);
  max-width: 260px;
}
.toast.ok   { border-left: 2px solid #22c55e; }
.toast.err  { border-left: 2px solid #ef4444; }
.toast.info { border-left: 2px solid var(--cobalt); }
@keyframes tIn  { from{opacity:0;transform:translateX(8px)} to{opacity:1;transform:translateX(0)} }
@keyframes tOut { to  {opacity:0;transform:translateX(8px)} }

/* ── Utils ── */
.hidden { display: none !important; }