/* Base reset & theme */
:root {
  --bg: #f5f7fb;
  --panel-bg: #ffffff;
  --border: #dce2ec;
  --border-strong: #c2ccd9;
  --text: #1f2933;
  --text-soft: #52606d;
  --brand: #2563eb;
  --brand-accent: #1d4ed8;
  --danger: #dc2626;
  --danger-accent: #b91c1c;
  --focus: #2563eb;
  --radius-s: 4px;
  --radius-m: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px -2px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.06);
  --mono: 'SFMono-Regular', ui-monospace, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 16px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; font-weight: 600; }

/* Layout */
.app-header {
  padding: 1.25rem 2rem; 
  background: linear-gradient(90deg, #ffffff, #eef3fb);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}
.app-header h1 { margin: 0; font-size: 1.5rem; letter-spacing: .5px; flex: 0 0 auto; }
.auth-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  flex: 1 1 220px;
  min-width: 0;
}
.auth-token-input {
  flex: 1 1 140px;
  max-width: 220px;
  padding: 0.4rem 0.6rem;
  font-size: 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-s);
}
.auth-status { font-size: 0.7rem; color: var(--text-soft); max-width: 100%; }
.read-only-mode .panel:first-of-type { opacity: 0.92; }
.read-only-mode form#prompt-form {
  pointer-events: none;
  user-select: none;
}
.rating--readonly .star { cursor: default; opacity: 0.85; }
.header-tools { display: flex; gap: .5rem; margin-left: auto; flex: 0 0 auto; }
.tool-btn { font: 600 .65rem system-ui; letter-spacing: .5px; padding: .45rem .75rem; border-radius: var(--radius-s); border: 1px solid var(--border-strong); background: #ffffff; cursor: pointer; text-transform: uppercase; color: var(--brand-accent); transition: background .15s, color .15s, border-color .15s, box-shadow .15s; box-shadow: var(--shadow-sm); }
.tool-btn:hover { background: #eef5ff; }
.tool-btn:active { background: #dbeafe; }
.tool-btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.iemessages { margin: .5rem 0 .75rem; font-size: .6rem; padding: .5rem .6rem; border: 1px solid var(--border-strong); border-radius: var(--radius-s); background: #f1f5f9; color: var(--text-soft); box-shadow: var(--shadow-sm); }
.iemessages.error { background: #fef2f2; border-color: var(--danger); color: var(--danger-accent); }
.iemessages.success { background: #ecfdf5; border-color: #34d399; color: #047857; }

.layout {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  padding: 2rem clamp(1rem, 4vw, 3rem) 3rem;
  align-items: start;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 1.5rem 1.5rem 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  min-height: 300px;
}
.panel-title { margin: 0 0 .75rem; font-size: 1.1rem; }
.panel-header { display: flex; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: .75rem; }

/* Form */
form { display: flex; flex-direction: column; gap: 1.1rem; }
.field-group { display: flex; flex-direction: column; gap: .4rem; }
label { font-size: .85rem; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--text-soft); }
input[type=text], textarea {
  width: 100%;
  padding: .75rem .85rem;
  border-radius: var(--radius-s);
  border: 1px solid var(--border-strong);
  background: #f9fafb;
  font: inherit;
  resize: vertical;
  transition: border-color .15s, background .15s, box-shadow .15s;
}
input[type=text]:focus, textarea:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(37,99,235,.25);
  background: #fff;
}
.field-hint { margin: 0; font-size: .7rem; color: var(--text-soft); }
.form-error { margin-top: .25rem; font-size: .75rem; color: var(--danger); min-height: 1em; }

.actions { display: flex; }
button[type=submit] {
  font: 500 .9rem system-ui;
  padding: .7rem 1.2rem;
  background: var(--brand);
  color: #fff;
  border: 1px solid var(--brand-accent);
  border-radius: var(--radius-s);
  cursor: pointer;
  display: inline-flex; align-items: center; gap: .4rem;
  box-shadow: var(--shadow-sm);
  transition: background .18s, transform .15s, box-shadow .2s;
}
button[type=submit]:hover { background: var(--brand-accent); }
button[type=submit]:active { transform: translateY(1px); }
button[type=submit]:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* Cards */
.cards { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, #ffffff, #f8fafc 60%);
  padding: 1rem 1rem 0.85rem;
  display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .15s;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-title { margin: 0 0 .35rem; font-size: .95rem; font-weight: 600; letter-spacing: .3px; }
.card-preview { margin: 0; font-size: .8rem; line-height: 1.3; color: var(--text-soft); font-family: var(--mono); max-height: 2.6em; overflow: hidden; }
.card-actions { display: flex; flex-direction: column; }

/* Metadata */
.prompt-meta { margin: .5rem 0 .4rem; display: flex; flex-direction: column; gap: .25rem; font-size: .6rem; letter-spacing: .3px; }
.prompt-meta-row { display: flex; flex-wrap: wrap; gap: .4rem .75rem; align-items: center; }
.prompt-meta-tag { background: #eef2f8; color: var(--text-soft); padding: .25rem .45rem; border-radius: 999px; font-weight: 600; border: 1px solid var(--border); display: inline-flex; align-items: center; gap: .35rem; }
.prompt-meta time { font-family: var(--mono); font-size: .6rem; }
.token-estimate { display: inline-flex; align-items: center; gap: .35rem; padding: .25rem .45rem; border-radius: 6px; font-weight: 600; border: 1px solid var(--border); background: #f1f5f9; }
.token-estimate[data-confidence=high] { background: #ecfdf5; color: #047857; border-color: #34d399; }
.token-estimate[data-confidence=medium] { background: #fffbeb; color: #b45309; border-color: #fcd34d; }
.token-estimate[data-confidence=low] { background: #fef2f2; color: #b91c1c; border-color: #fca5a5; }
.token-range { font-family: var(--mono); font-size: .6rem; }
.model-name { font-family: var(--mono); font-size: .6rem; font-weight: 600; color: var(--brand-accent); }

/* Rating Component */
.rating { 
  display: inline-flex; 
  gap: 2px; 
  margin: .35rem 0 .25rem; 
  user-select: none; 
}
.rating[aria-busy=true] { opacity: .6; }
.rating button.star { 
  background: none; 
  border: none; 
  padding: 2px 3px; 
  line-height: 1; 
  font-size: .95rem; 
  cursor: pointer; 
  color: #c7ccd3; 
  transition: color .15s, transform .15s; 
  border-radius: 4px; 
}
.rating button.star.filled { color: #ffb400; }
.rating button.star:hover { transform: scale(1.18); color: #ffbf29; }
.rating button.star:active { transform: scale(.92); }
.rating button.star:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.rating button.star[aria-checked=true] { color: #ffae00; }
.rating .visually-hidden { 
  position: absolute; 
  width: 1px; 
  height: 1px; 
  padding: 0; 
  margin: -1px; 
  overflow: hidden; 
  clip: rect(0 0 0 0); 
  white-space: nowrap; 
  border: 0; 
}

.delete-btn {
  --btn-bg: #ffffff;
  --btn-border: var(--border-strong);
  font: 500 .7rem system-ui;
  padding: .45rem .65rem;
  border-radius: var(--radius-s);
  border: 1px solid var(--btn-border);
  color: var(--danger-accent);
  background: var(--btn-bg);
  cursor: pointer;
  letter-spacing: .5px;
  text-transform: uppercase;
  transition: background .15s, border-color .15s, color .15s;
}
.delete-btn:hover { background: #fff5f5; border-color: var(--danger); color: var(--danger); }
.delete-btn:active { background: #ffe5e5; }
.delete-btn:focus-visible { outline: 2px solid var(--danger); outline-offset: 2px; }

.count-badge { background: #eef2f8; color: var(--text-soft); font-size: .65rem; padding: .35rem .55rem; border-radius: 999px; border: 1px solid var(--border); font-weight: 600; letter-spacing: .5px; }

.empty-state { border: 1px dashed var(--border-strong); border-radius: var(--radius-m); padding: 1rem; text-align: center; background: #f9fbfd; color: var(--text-soft); font-size: .85rem; }

.app-footer {
  margin-top: 2rem;
  padding: 1.5rem 2rem 3rem;
  font-size: .65rem;
  text-align: center;
  color: var(--text-soft);
}

/* Utility */
[hidden] { display: none !important; }

/* Notes Feature */
.notes { margin: .55rem 0 .9rem; padding: .55rem .6rem .65rem; background: #f9fafb; border: 1px solid var(--border); border-radius: var(--radius-s); position: relative; }
.notes-header { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .4rem; }
.notes-title { margin: 0; font-size: .65rem; font-weight: 700; letter-spacing: .5px; text-transform: uppercase; color: var(--text-soft); }
.add-note-btn { font: 600 .6rem system-ui; letter-spacing: .5px; padding: .35rem .55rem; border-radius: var(--radius-s); border: 1px solid var(--border-strong); background: #ffffff; cursor: pointer; text-transform: uppercase; color: var(--brand-accent); transition: background .15s, color .15s, border-color .15s; }
.add-note-btn:hover { background: #eef5ff; }
.add-note-btn:active { background: #dbeafe; }
.add-note-btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.notes-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .5rem; }
.note { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-s); padding: .5rem .6rem .55rem; position: relative; display: flex; flex-direction: column; gap: .4rem; box-shadow: 0 1px 1px rgba(0,0,0,0.04); }
.note.editing { border-color: var(--focus); box-shadow: 0 0 0 2px rgba(37,99,235,.25); }
.note-content { margin: 0; font-size: .7rem; line-height: 1.35; color: var(--text); white-space: pre-wrap; word-break: break-word; display: -webkit-box; -webkit-line-clamp: 6; -webkit-box-orient: vertical; overflow: hidden; }
.note-meta { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.note-meta time { font-size: .55rem; letter-spacing: .5px; color: var(--text-soft); font-weight: 600; text-transform: uppercase; }
.note-buttons { display: flex; gap: .3rem; }
.note-buttons button, .note-controls button { font: 600 .55rem system-ui; padding: .3rem .55rem; border-radius: var(--radius-s); border: 1px solid var(--border-strong); background: #ffffff; cursor: pointer; letter-spacing: .5px; text-transform: uppercase; color: var(--text-soft); transition: background .15s, color .15s, border-color .15s; }
.note-buttons button:hover, .note-controls button:hover { background: #f1f5f9; }
.note-buttons button:focus-visible, .note-controls button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.note-buttons button[data-action=delete-note] { color: var(--danger-accent); }
.note-buttons button[data-action=delete-note]:hover { background: #fff5f5; color: var(--danger); }
.note textarea { width: 100%; font: 500 .7rem system-ui; background: #ffffff; border: 1px solid var(--border-strong); border-radius: var(--radius-s); padding: .55rem .6rem; resize: vertical; min-height: 90px; line-height: 1.35; }
.note textarea:focus { outline: none; border-color: var(--focus); box-shadow: 0 0 0 3px rgba(37,99,235,.25); }
.note-controls { display: flex; gap: .4rem; }
.note-validation { font-size: .55rem; color: var(--danger); min-height: .9em; }
.notes-error { position: absolute; top: -0.75rem; left: .5rem; right: .5rem; font-size: .55rem; color: var(--danger); background: #fff; padding: .15rem .45rem; border-radius: var(--radius-s); border: 1px solid var(--danger-accent); box-shadow: 0 2px 4px -2px rgba(0,0,0,.08); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

@media (min-width: 760px) {
  .note-content { font-size: .72rem; }
}

@media (min-width: 760px) {
  .cards { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
}