/* ============================================================
   Titration Simulation v3 — edutec
   Matches reference layout: header + left panel + canvas + right panel
   No scroll. Fixed 100vh.
   ============================================================ */

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

:root {
  --green:        #45825D;
  --green-mid:    #56A070;
  --green-light:  #66C18E;
  --green-bg:     linear-gradient(135deg, #45825D 0%, #66C18E 100%);
  --white:        #ffffff;
  --off-white:    #f4f4f2;
  --panel-bg:     rgba(255,255,255,0.96);
  --border:       #e0e0e0;
  --text:         #2c2c2c;
  --muted:        #777;
  --amber:        #e8a020;
  --amber-light:  #fff4de;
  --shadow:       0 2px 10px rgba(0,0,0,0.12);
  --radius:       10px;
  --font:         'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --mono:         'Courier New', Courier, monospace;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #45825D 0%, #66C18E 100%);
  height: 100vh;
  overflow: hidden;
  color: #333;
  display: flex;
  flex-direction: column;
}

/* ── Header ──────────────────────────────────────────── */
.header {
  background: linear-gradient(135deg, #66c18e 0%, #45825d 100%);
  height: 70px;
  display: flex;
  align-items: center;
  padding: 15px 30px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  flex-shrink: 0;
  gap: 16px;
}
.logo {
    height: 45px;
    width: auto;
    margin-right: 15px;
}
.logo-wrap {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 700; color: rgba(255,255,255,0.92);
  letter-spacing: 0.04em; min-width: 100px;
}
.logo-text { font-size: 14px; font-weight: 700; }
.header-title {
  flex: 1; text-align: center;
  font-size: 22px; font-weight: 700; color: #fff;
}
.header-right { min-width: 100px; display: flex; justify-content: flex-end; }
.step-pill {
  background: rgba(255,255,255,0.18);
  color: rgba(255,255,255,0.92);
  font-size: 12px; font-weight: 600;
  padding: 4px 14px; border-radius: 20px;
  font-family: var(--mono);
}
.btn2 {
  background: rgba(255,255,255,0.18);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.45);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s;
}
.btn2:hover {
  background: rgba(255,255,255,0.30);
}

.button-note {
  display: flex;
  justify-content: center;
  margin: 4px 0 12px;
}

.btn3 {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--green, #45825D);
  border: 1.5px solid var(--green, #45825D);
  border-radius: 22px;
  padding: 8px 16px 8px 14px;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font, 'Segoe UI', sans-serif);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(69,130,93,0.15);
  transition: background 0.15s ease, color 0.15s ease,
              transform 0.15s ease, box-shadow 0.15s ease;
}

.btn3:hover {
  background: var(--green, #45825D);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(69,130,93,0.35);
}

.btn3:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(69,130,93,0.25);
}

.btn3 #notebookCount {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--green, #45825D);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  transition: background 0.15s ease, color 0.15s ease;
}

.btn3:hover #notebookCount {
  background: #fff;
  color: var(--green, #45825D);
}

/* ── Main container ──────────────────────────────────── */
.main-container {
  display: flex;
  flex: 1;
  height: calc(100vh - 70px);
  overflow: hidden;
}

/* ── Left panel ──────────────────────────────────────── */
.left-panel {
  width: 280px;
  background: rgb(255, 255, 255, 0.95);
  padding: 20px;
  box-shadow: 2px 0 10px rgba(0,0,0,0.10);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow: hidden;
  flex-shrink: 0;
}
.panel-title {
  font-size: 18px; font-weight: bolder; color: #333;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 2px solid #45825D;
}

/* ── Step buttons ────────────────────────────────────── */
.steps-list { display: flex; flex-direction: column; gap: 7px; flex: 1; overflow-y: auto; min-height: 0; }

.module-button {
  width: 100%; background: #fff;
  border: 2px solid #ddd; border-radius: 10px;
  padding: 15px;
  cursor: pointer; transition: all 0.25s ease;
  text-align: left; display: flex; align-items: center; gap: 10px;
  font-family: var(--font);
}
.module-button:not(.locked):hover {
  border-color:  #45825D;
  box-shadow: 0 4px 12px rgba(69,130,93,0.22);
}
.module-button.active {
  background: var(--green-bg);
  border-color:  #45825D;
  color: #fff;
}
.module-button.done {
  background: #eaf5ef;
  border-color: var(--green-light);
  color: var(--text);
}
.module-button.locked {
  opacity: 0.42;
  cursor: not-allowed;
  pointer-events: none;
}
.module-icon { font-size: 24px; flex-shrink: 0; }
.module-info { flex: 1; }
.module-name { font-weight: 700; font-size: 14px; margin-bottom: 2px; }
.module-desc { font-size: 11px; opacity: 0.75; }
.tick { font-size: 14px; color:  #45825D; flex-shrink: 0; }
.module-button.done .tick::after { content: '✓'; }

/* ── Center panel ────────────────────────────────────── */
.center-panel {
  flex: 1;
  background: #dde8e2;
  display: flex; justify-content: center; align-items: center;
  position: relative;
  overflow: hidden;
}
#mainCanvas {
  background: transparent;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.14);
  display: block;
}

/* ── Drag layer & items ──────────────────────────────── */
#dragLayer {
  position: absolute; inset: 0;
  pointer-events: none;
}
.drag-item {
  position: absolute;
  pointer-events: all;
  cursor: grab;
  user-select: none;
  touch-action: none;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  transition: transform 0.15s, filter 0.15s;
  filter: drop-shadow(0 3px 8px rgba(0,0,0,0.15));
}
.drag-item:hover  { transform: translateY(-3px) scale(1.04); }
.drag-item:active { cursor: grabbing; }
.bag-formula {
  font-size: 12px; font-weight: 700;
  color: var(--green); font-family: var(--mono);
  background: rgba(255,255,255,0.85);
  padding: 2px 8px; border-radius: 10px;
}
.bag-mass {
  font-size: 13px; font-weight: 800;
  background: rgba(255,255,255,0.85);
  padding: 1px 8px; border-radius: 10px;
}

/* =====================================
   HCl Graduated Beaker
===================================== */

.hcl-beaker{
    position:relative;
    width:90px;
    height:120px;
    background:#e8f4fa;
    border:3px solid #6aaac0;
    border-top:none;
    border-radius:0 0 12px 12px;
    overflow:hidden;
}

/* Pouring lip */
.hcl-beaker::before{
    content:"";
    position:absolute;
    top:-6px;
    left:0;
    width:100%;
    height:8px;
    border-top:3px solid #6aaac0;
    border-left:3px solid #6aaac0;
    border-right:3px solid #6aaac0;
    border-radius:8px 8px 0 0;
    background:#e8f4fa;
}

/* HCl liquid */
.beaker-liquid{
    position:absolute;
    bottom:0;
    left:0;
    width:100%;
    height:80%;
    background:rgba(55,140,220,0.35);
}

/* Graduation marks */
.grad{
    position:absolute;
    right:0;
    width:18px;
    border-top:2px solid #4d6d7a;
}

.grad1{top:20px;}
.grad2{top:40px;}
.grad3{top:60px;}
.grad4{top:80px;}
.grad5{top:100px;}

/* Labels */
.beaker-label{
    position:absolute;
    width:100%;
    top:40px;
    text-align:center;
    font-size:12px;
    font-weight:bold;
    color:#1a4e78;
    z-index:2;
}

.beaker-label span{
    font-size:10px;
    font-weight:600;
}
/* Indicator bottle */
.ind-bottle { text-align:center; }
.ind-dropper {
  width:8px; height:18px; background:#d4a820;
  border-radius:4px 4px 0 0; margin:0 auto; border:1px solid #b88c10;
}
.ind-body {
  width:54px; background:linear-gradient(160deg,#fff0c8,#ffe4a0);
  border:1.5px solid #d4a820; border-radius:4px 4px 8px 8px;
  padding:8px 6px 10px; margin-top:-1px;
}
.ind-label { font-size:10px; font-weight:600; color:#7a5800; font-family:var(--mono); }

.drag-label { font-size:10px; color:#555; text-align:center; }

/* ── Drop zones ──────────────────────────────────────── */
.drop-zone {
  position:absolute;
  pointer-events:all;
  border-radius:6px;
  transition:box-shadow 0.2s, background 0.2s;
}
.drop-zone.over {
  box-shadow:0 0 0 3px  #45825D, 0 0 16px rgba(69,130,93,0.5);
  background:rgba(69,130,93,0.08);
}

/* ── Tap knob ────────────────────────────────────────── */
.tap-knob-wrap {
  position:absolute;
  display:flex; flex-direction:column; align-items:center; gap:6px;
  pointer-events:all;
}
.tap-knob {
  width:56px; height:56px; border-radius:50%;
  background: #45825D; border:3px solid var(--green-light);
  cursor:pointer; position:relative;
  display:flex; align-items:center; justify-content:center;
  transition:background 0.15s, transform 0.1s, border-color 0.15s;
  box-shadow:0 3px 10px rgba(0,0,0,0.22);
  user-select:none; touch-action:none;
}
.tap-knob:hover { background:var(--green-mid); }
.tap-knob.open  { background:#b03030; border-color:#e05050; transform:rotate(90deg); }
.knob-bar {
  width:5px; height:22px; border-radius:3px;
  background:rgba(255,255,255,0.85);
}
.knob-hint { font-size:11px; color:#444; text-align:center; white-space:nowrap; font-weight:600; }

/* ── Canvas overlay buttons ──────────────────────────── */
.canvas-btn {
  background: #45825D;
  color:#fff; border:none; border-radius:22px;
  padding:9px 22px; font-size:13px; font-weight:600;
  cursor:pointer; font-family:var(--font);
  transition:background 0.15s, transform 0.1s;
  box-shadow:0 2px 10px rgba(0,0,0,0.18);
  white-space:nowrap; pointer-events:all;
}
.center-panel > .canvas-btn {
  position: absolute;
  left: 50%;
  /* `translate` keeps the button centred independently of `transform`, so the
     :active press scale can no longer cancel it and fling the button sideways. */
  translate: -50% 0;
  z-index: 5;
}
.canvas-btn:hover  { background:var(--green-mid); }
.canvas-btn:active { transform:scale(0.97); }
.canvas-btn.secondary { background:#666; }
.canvas-btn.secondary:hover { background:#444; }
.canvas-btn.success { background:#1f7a48; }
.canvas-btn.success:hover { background:#175f38; }
.canvas-btn.reagent { background:#2a6898; }
.canvas-btn.reagent:hover { background:#3278b0; }
.canvas-btn.warn    { background:#995520; }
.canvas-btn.warn:hover { background:#b06828; }
.canvas-btn:disabled { opacity:0.4; pointer-events:none; }

/* ── Right panel ─────────────────────────────────────── */
.right-panel {
  width: 250px;
  background: var(--panel-bg);
  padding: 18px 16px;
  box-shadow: -2px 0 10px rgba(0,0,0,0.10);
  display: flex; flex-direction: column; gap: 12px;
  overflow: hidden; flex-shrink: 0;
}

.instruction-card {
  background: var(--white); border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 12px 14px;
  display: flex; flex-direction: column; gap: 4px;
}
.instr-step-tag {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color:  #45825D;
}
.instr-title { font-size: 14px; font-weight: 700; color: var(--text); }
.instr-body  { font-size: 12px; color: var(--muted); line-height: 1.5; }

.status-display {
  background: #f0f5f2;
  border: 1px solid #c8ddd2;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px; font-weight: 600;
  text-align: center; color:  #45825D;
}

.step-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.nav-btn {
  border: 1.5px solid #c8ddd2;
  border-radius: 8px;
  background: #fff;
  color: #45825D;
  cursor: pointer;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 700;
  padding: 9px 8px;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.nav-btn:hover:not(:disabled) {
  border-color: #45825D;
  background: #eef7f2;
}

.nav-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.nav-btn.primary {
  background: #45825D;
  border-color: #45825D;
  color: #fff;
}

.nav-btn.primary:hover:not(:disabled) {
  background: #56A070;
}

.nav-btn:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

/* Colour indicator */
.colour-indicator {
  background: var(--white); border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 10px 14px;
  display: flex; align-items: center; gap: 10px;
}
.ci-label { font-size: 11px; color: var(--muted); flex-shrink:0; }
.ci-swatch {
  width: 28px; height: 28px; border-radius: 50%;
  border: 1.5px solid rgba(0,0,0,0.15);
  flex-shrink: 0;
  transition: background 0.5s;
}
.ci-name { font-size: 12px; font-weight: 600; color: var(--text); }

/* Reading card */
.reading-card {
  background: var(--white); border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 10px 14px;
  display: flex; flex-direction: column; gap: 7px;
}
.rc-row { display: flex; align-items: baseline; gap: 6px; }
.rc-label { font-size: 11px; color: var(--muted); flex: 1; }
.rc-val   { font-size: 17px; font-weight: 700; color: var(--text); font-family:var(--mono); }
.rc-unit  { font-size: 10px; color: var(--muted); }

/* Readings table */
.readings-table-wrap {
  background: var(--white); border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 10px;
  flex:1; overflow-y:auto; min-height:0;
}
.rt-header {
  display: grid; grid-template-columns: 32px 1fr 1fr 1fr;
  font-size: 10px; font-weight: 700; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.04em;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}
.rt-row {
  display: grid; grid-template-columns: 32px 1fr 1fr 1fr;
  font-size: 11px; font-family: var(--mono);
  padding: 4px 0; border-bottom: 1px solid #f0f0f0;
  color: var(--text);
}
.rt-row.good { color:  #45825D; font-weight: 600; }
.rt-row.over { color: #c03030; }
.rt-mean {
  margin-top: 8px; font-size: 12px; font-weight: 700;
  color:  #45825D; text-align: right;
}
.mono { font-family: var(--mono); }

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

/* ── Done overlay ────────────────────────────────────── */
.done-overlay {
  position:fixed; inset:0;
  background:rgba(0,0,0,0.55);
  display:flex; align-items:center; justify-content:center;
  z-index:200;
}
.done-card {
  background:#fff; border-radius:16px;
  padding:2.5rem 3rem;
  display:flex; flex-direction:column; align-items:center; gap:14px;
  box-shadow:0 8px 40px rgba(0,0,0,0.28);
  text-align:center; max-width:380px; width:90%;
}
.done-icon {
  width:64px; height:64px; border-radius:50%;
  background:#eaf5ef; color: #45825D;
  font-size:28px; display:flex; align-items:center; justify-content:center;
  border:2px solid var(--green-light);
}
.done-card h2 { font-size:22px; color: #45825D; }
.done-results {
  font-family:var(--mono); font-size:12px;
  line-height:2; color:var(--text);
  background:#f4f4f2; border-radius:8px;
  padding:12px 18px; width:100%; text-align:left;
}

/* ── Calculation worked-example overlay ─────────────────── */
.calc-card { max-width: 460px; }
.calc-card .done-results {
  display:flex; flex-direction:column; gap:10px; align-items:stretch;
  background:transparent; padding:0; line-height:1.5;
}
.calc-formula {
  font-family: var(--mono); font-size: 13px; font-weight:700;
  background:#eaf5ef; color:#1f7a48; border-radius:8px;
  padding:8px 12px; text-align:center;
}
.calc-example-table {
  width:100%; border-collapse:collapse; font-family:var(--mono); font-size:12px;
}
.calc-example-table th, .calc-example-table td {
  padding:6px 8px; text-align:right; border-bottom:1px solid #e5e5e5;
}
.calc-example-table th:first-child, .calc-example-table td:first-child { text-align:left; }
.calc-example-table thead th {
  color:var(--muted); font-weight:700; text-transform:uppercase;
  font-size:10px; letter-spacing:.05em; border-bottom:2px solid #ddd;
}
.calc-example-table tr.concordant td { color:#1f7a48; font-weight:700; background:#eaf5ef; }
.calc-example-table tr.discard td { color:#c03030; text-decoration:line-through; opacity:0.7; }
.calc-note {
  font-size:11.5px; color:var(--muted); line-height:1.5; text-align:left;
}
.calc-note strong { color:var(--text); }

/* ── Reading-card titre note ─────────────────────────────── */
.rc-note {
  font-size:10.5px; color:var(--muted); font-family:var(--mono);
  text-align:center; margin-top:2px; padding-top:6px;
  border-top:1px dashed var(--border);
}

/* ── Readings table reinforcement ────────────────────────── */
.rt-formula {
  font-size:10px; color:var(--muted); font-family:var(--mono);
  margin: -2px 0 6px; text-align:center;
}
.rt-mean-detail {
  font-size:10.5px; color:var(--muted); font-family:var(--mono);
  text-align:right; margin-top:2px;
}
.rt-legend {
  display:flex; gap:14px; font-size:10px; color:var(--muted);
  margin-top:8px; justify-content:center;
}
.rt-legend .dot {
  width:8px; height:8px; border-radius:50%; display:inline-block; margin-right:4px;
}
.rt-legend span { display:flex; align-items:center; }
.rt-legend .dot.good { background: #45825D; }
.rt-legend .dot.over { background:#c03030; }
/* ── View readings button (left panel) ───────────────── */
.view-readings-btn {
  margin-top: 14px;
  width: 100%;
  padding: 10px 14px;
  background: #45825D;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.2s;
}
.view-readings-btn:hover { background: #56A070; }

/* ── Readings popup ───────────────────────────────────── */
.readings-popup-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 300;
}
.readings-popup {
  background: #fff;
  border-radius: 16px;
  padding: 1.75rem 2rem;
  width: 620px;
  max-width: 95vw;
  box-shadow: 0 8px 40px rgba(0,0,0,0.28);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.readings-popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid #45825D;
  padding-bottom: 10px;
}
.readings-popup-header h3 {
  font-size: 17px;
  font-weight: 700;
  color: #45825D;
}
.popup-close-btn {
  background: none; border: none;
  font-size: 18px; cursor: pointer;
  color: #777; line-height: 1;
}
.popup-close-btn:hover { color: #333; }
.readings-popup-table { width: 100%; }
.popup-rt-header {
  display: grid;
  grid-template-columns: 40px 1fr 1fr 1fr 80px;
  font-size: 11px; font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding-bottom: 6px;
  border-bottom: 1.5px solid var(--border);
  margin-bottom: 4px;
}
.popup-rt-row {
  display: grid;
  grid-template-columns: 40px 1fr 1fr 1fr 80px;
  font-size: 13px;
  font-family: var(--mono);
  padding: 6px 0;
  border-bottom: 1px solid #f0f0f0;
  color: var(--text);
}
.popup-rt-row.good { color: #45825D; font-weight: 600; }
.popup-rt-row.over { color: #c03030; }
.readings-popup-mean {
  font-size: 15px;
  font-weight: 700;
  color: #45825D;
  text-align: right;
  padding-top: 6px;
  border-top: 1.5px solid var(--border);
}
.readings-popup-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}
.popup-calc-btn {
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  font-family: var(--font);
  background: #45825D;
  color: #fff;
  transition: background 0.2s;
}
.popup-calc-btn:hover { background: #56A070; }
.popup-calc-btn.secondary {
  background: #f0f0f0;
  color: #333;
}
.popup-calc-btn.secondary:hover { background: #ddd; }
.popup-calc-steps {
  background: #eaf5ef;
  border-radius: 10px;
  padding: 12px 16px;
  font-family: var(--mono);
  font-size: 12px;
  color: #1f7a48;
  line-height: 2;
}
/* ── Canvas action bar (anchored bottom of canvas) ───── */
.canvas-action-bar {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  align-items: center;
  z-index: 10;
  pointer-events: none;
}
.canvas-action-bar .canvas-btn {
  position: static;
  pointer-events: all;
}

/* ============================================================
   Shared additions for Qualitative Analysis
   (kept in the master sheet so all three experiments stay in sync)
   ============================================================ */

.panel-subtitle {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--green);
  margin: 10px 0 4px 2px; flex-shrink: 0;
}

/* ── Step 0: choose-what-to-test overlay ─────────────────── */
.choose-overlay {
  position: absolute; inset: 0;
  background: rgba(10,35,18,0.82);
  display: flex; align-items: center; justify-content: center;
  z-index: 50;
}
.choose-card {
  background: #fff; border-radius: 16px;
  padding: 2rem 2.5rem;
  max-width: 520px; width: 92%;
  box-shadow: 0 8px 40px rgba(0,0,0,0.30);
  display: flex; flex-direction: column; gap: 16px;
  text-align: center;
}
.choose-card h2 { font-size: 20px; color: var(--green); font-weight: 700; }
.choose-card p  { font-size: 13px; color: var(--muted); }
.choose-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.choose-tile {
  border: 2px solid var(--border); border-radius: 12px;
  padding: 16px 8px; cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.choose-tile:hover { border-color: var(--green); transform: translateY(-2px); }
.choose-tile.selected {
  border-color: var(--green); background: #eaf5ef;
  box-shadow: 0 0 0 3px rgba(69,130,93,0.18);
}
.tile-icon  { font-size: 28px; }
.tile-label { font-size: 14px; font-weight: 700; color: var(--text); }
.tile-desc  { font-size: 10px; color: var(--muted); line-height: 1.4; }
.choose-start-btn {
  background: var(--green); color: #fff;
  border: none; border-radius: 22px;
  padding: 11px 28px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: background 0.15s;
  font-family: var(--font); align-self: center;
}
.choose-start-btn:hover { background: var(--green-mid); }

/* ── Unknown-sample summary card ─────────────────────────── */
.unknown-card {
  background: #fff8e8; border: 1.5px solid #e8c060;
  border-radius: var(--radius); padding: 10px 12px;
  display: flex; flex-direction: column; gap: 4px;
  flex-shrink: 0;
}
.unk-label { font-size: 10px; font-weight: 700; color: #8b5e00; text-transform: uppercase; letter-spacing: 0.06em; }
.unk-gas, .unk-anion, .unk-cation { font-size: 12px; color: var(--text); }
.unk-tag  { font-weight: 700; color: var(--green); margin-right: 4px; }
.unk-note { font-size: 10px; color: var(--muted); margin-top: 3px; font-style: italic; }

/* ── Observations log ─────────────────────────────────────── */
.obs-panel {
  background: #fff; border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 10px 12px;
  display: flex; flex-direction: column; gap: 6px;
  flex: 1; min-height: 0;
}
.obs-title   { font-size: 11px; font-weight: 700; color: var(--green); flex-shrink: 0; }
.obs-entries { overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 6px; }
.obs-empty   { font-size: 11px; color: var(--muted); font-style: italic; }
.obs-entry {
  font-size: 11px; line-height: 1.5; color: var(--text);
  padding: 6px 8px; background: #f7faf8;
  border-radius: 6px; border-left: 3px solid var(--green);
}
.obs-stage {
  display: block; font-size: 10px; font-weight: 700;
  color: var(--green); margin-bottom: 2px; text-transform: uppercase;
  letter-spacing: 0.05em;
}
.obs-conclusion { display: block; font-size: 10px; font-weight: 700; color: #2a6898; margin-top: 3px; }