/* =============================================================================
 * components.css — buttons, inputs, tables, badges, meters, QC cards, quiz
 * ===========================================================================*/

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  font: inherit; font-weight: 600; border-radius: var(--radius-sm);
  padding: 10px 18px; border: 1px solid transparent; transition: background .15s, box-shadow .15s;
}
.btn-primary { background: var(--accent); color: #1a1a1a; }
.btn-primary:hover { background: #cf8f2e; text-decoration: none; }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.24); text-decoration: none; }
.btn-outline { background: var(--surface); color: var(--primary); border-color: var(--border); }
.btn-outline:hover { border-color: var(--primary-light); }
.btn-sm { padding: 6px 12px; font-size: .9rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0; }

/* ---- Form controls ---- */
.field { margin: 14px 0; }
.field > label { display: block; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
.field .hint { color: var(--muted); font-size: .85rem; font-weight: 400; }
input[type="number"], input[type="text"], select {
  width: 100%; padding: 9px 11px; font: inherit; color: var(--ink);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
}
input[type="range"] { width: 100%; accent-color: var(--accent); height: 28px; }
.range-row { display: flex; align-items: center; gap: 10px; }
.range-row output { min-width: 64px; text-align: right; font-family: var(--font-mono); font-weight: 700; color: var(--primary); }
.inline-3 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ---- Tables ---- */
table.data { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: .95rem; }
table.data th, table.data td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border); }
table.data thead th { background: var(--primary); color: #fff; font-weight: 600; }
table.data tbody tr:nth-child(even) { background: var(--panel); }
table.data caption { caption-side: bottom; color: var(--muted); font-size: .82rem; padding-top: 8px; text-align: left; }
.table-wrap { overflow-x: auto; }

/* ---- Result / readout cards ---- */
.readout { background: var(--panel); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.readout .big { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; font-size: .95rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-family: var(--font-mono); }

/* Stacked bar (acid/base fraction) */
.stackbar { display: flex; height: 30px; border-radius: 6px; overflow: hidden; border: 1px solid var(--border); margin: 10px 0; }
.stackbar .seg-acid { background: var(--accent); }
.stackbar .seg-base { background: var(--accent-2); }
.stackbar .seg { display: flex; align-items: center; justify-content: center; color: #1a1a1a; font-size: .8rem; font-weight: 600; min-width: 0; }

/* ---- Alerts / callouts ---- */
.alert { border-radius: var(--radius); padding: 12px 16px; margin: 12px 0; border-left: 5px solid; background: var(--surface); }
.alert-info    { border-color: var(--primary-light); background: var(--panel); }
.alert-warn    { border-color: var(--caution); }
.alert-danger  { border-color: var(--warning); }
.alert-success { border-color: var(--success); }
.alert strong { color: inherit; }
.disclaimer { font-size: .85rem; color: var(--muted); border-left: 3px solid var(--accent); padding-left: 10px; margin: 14px 0; }

/* ---- Badges / status pills ---- */
.badge { display: inline-flex; align-items: center; gap: 5px; font-size: .8rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; }
.badge-pass { background: rgba(42,127,98,.15); color: var(--success); }
.badge-warn { background: rgba(199,125,10,.15); color: var(--caution); }
.badge-fail { background: rgba(158,42,43,.15); color: var(--warning); }

/* ---- QC report card ---- */
.qc-list { list-style: none; padding: 0; margin: 10px 0; }
.qc-list li { display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 8px; background: var(--surface); }
.qc-list .qc-ico { font-size: 1.1rem; flex: 0 0 auto; line-height: 1.4; }
.qc-list .qc-pass .qc-ico { color: var(--success); }
.qc-list .qc-warn .qc-ico { color: var(--caution); }
.qc-list .qc-fail .qc-ico { color: var(--warning); }
.qc-list .qc-body small { color: var(--muted); display: block; }

/* ---- pH-meter display ---- */
.meter { background: #0b1418; border-radius: var(--radius); padding: 16px; color: #7CFFB2; font-family: var(--font-mono); box-shadow: inset 0 0 0 2px #25333a; }
.meter .meter-ph { font-size: 2.6rem; font-weight: 700; letter-spacing: 1px; }
.meter .meter-mv { font-size: 1rem; color: #6fd3e6; }
.meter .meter-label { color: #9fb0b6; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; }

/* Beaker (SVG-driven, but a CSS fallback box) */
.beaker-wrap { display: flex; justify-content: center; align-items: flex-end; min-height: 180px; }

/* ---- Step tracker ---- */
.steps { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 16px; }
.steps .step { flex: 1 1 auto; text-align: center; padding: 8px 6px; border-radius: var(--radius-sm); background: var(--panel); color: var(--muted); font-size: .82rem; border: 1px solid var(--border); }
.steps .step.active { background: var(--accent); color: #1a1a1a; font-weight: 700; border-color: var(--accent); }
.steps .step.done { background: var(--success); color: #fff; border-color: var(--success); }

/* ---- Quiz ---- */
.quiz-q { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin: 16px 0; box-shadow: var(--shadow); }
.quiz-q .qnum { color: var(--accent-2); font-weight: 700; font-size: .82rem; text-transform: uppercase; }
.quiz-options { list-style: none; padding: 0; margin: 12px 0; display: grid; gap: 8px; }
.quiz-options li { }
.quiz-opt { display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left; padding: 11px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); cursor: pointer; font: inherit; color: var(--ink); }
.quiz-opt:hover { border-color: var(--primary-light); }
.quiz-opt.correct { border-color: var(--success); background: rgba(42,127,98,.12); }
.quiz-opt.incorrect { border-color: var(--warning); background: rgba(158,42,43,.12); }
.quiz-opt .opt-key { font-weight: 700; font-family: var(--font-mono); color: var(--primary); }
.quiz-explain { margin-top: 10px; padding: 12px 14px; border-left: 4px solid var(--accent); background: var(--panel); border-radius: var(--radius-sm); font-size: .95rem; display: none; }
.quiz-explain.show { display: block; }
.quiz-score { font-size: 1.3rem; font-weight: 700; color: var(--primary); }
.progress-bar { height: 8px; background: var(--panel); border-radius: 999px; overflow: hidden; margin: 8px 0 18px; }
.progress-bar > span { display: block; height: 100%; background: var(--accent); width: 0; transition: width .3s; }

/* ---- Canvas / chart holder ---- */
.chart-holder { position: relative; width: 100%; }
.chart-holder canvas { width: 100% !important; height: auto; max-height: 420px; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: .85rem; color: var(--muted); margin-top: 8px; }
.legend .key { display: inline-flex; align-items: center; gap: 6px; }
.legend .swatch { width: 14px; height: 14px; border-radius: 3px; display: inline-block; }

/* Misc */
.muted { color: var(--muted); }
.center { text-align: center; }
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.objective-chip { background: var(--panel); border-radius: var(--radius-sm); padding: 6px 12px; font-size: .9rem; display: inline-flex; gap: 8px; }
.objective-chip .num { color: var(--accent); font-weight: 700; }