/* EST Math Pro — Frontend Styles */
.emp-root {
  --emp-accent: #d4a843;
  --emp-accent-dim: rgba(212,168,67,.15);
  --emp-accent-dark: #b8832a;
  --emp-bg: #06080f;
  --emp-bg2: #0c1018;
  --emp-surf: #111620;
  --emp-surf2: #181f2e;
  --emp-border: #252d42;
  --emp-border2: #2e3a52;
  --emp-text: #e2e8f4;
  --emp-text2: #94a3b8;
  --emp-text3: #4a5568;
  --emp-green: #22c55e;
  --emp-green-dim: rgba(34,197,94,.12);
  --emp-red: #ef4444;
  --emp-red-dim: rgba(239,68,68,.12);
  --emp-blue: #3b82f6;
  --emp-blue-dim: rgba(59,130,246,.12);
  --emp-amber: #f59e0b;
  --r: 14px;
  --r-sm: 8px;

  background: var(--emp-bg);
  color: var(--emp-text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  border-radius: 20px;
  padding: 32px;
  max-width: 860px;
  margin: 0 auto;
  line-height: 1.6;
  position: relative;
  overflow: hidden;
}
.emp-root::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(212,168,67,.07) 0%, transparent 55%),
    radial-gradient(ellipse 60% 60% at 90% 110%, rgba(59,130,246,.05) 0%, transparent 55%);
}
.emp-root * { box-sizing: border-box; margin: 0; padding: 0; }
.emp-root > * { position: relative; }
.emp-hidden { display: none !important; }

/* NOTICES */
.emp-notice { padding: 14px 18px; border-radius: var(--r-sm); font-size: 14px; }
.emp-notice-error { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); color: #fca5a5; }

/* HERO */
.emp-hero { text-align: center; margin-bottom: 36px; padding-top: 8px; }
.emp-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--emp-accent-dim); border: 1px solid rgba(212,168,67,.3);
  color: var(--emp-accent); font-size: 11px; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase;
  padding: 6px 16px; border-radius: 20px; margin-bottom: 18px;
}
.emp-title {
  font-size: clamp(30px,5vw,50px); font-weight: 800; line-height: 1.05;
  background: linear-gradient(135deg, var(--emp-text) 30%, var(--emp-accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 12px;
}
.emp-subtitle { color: var(--emp-text2); font-size: 15px; max-width: 440px; margin: 0 auto; }

/* PANELS */
.emp-panel {
  background: var(--emp-surf); border: 1px solid var(--emp-border);
  border-radius: 18px; padding: 22px; margin-bottom: 16px;
  position: relative; overflow: hidden;
}
.emp-panel::before {
  content: ''; position: absolute; top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(180deg, var(--emp-accent), transparent);
}
.emp-panel-head {
  display: flex; align-items: center; gap: 12px; margin-bottom: 16px;
  font-size: 20px;
}
.emp-panel-head > div { display: flex; flex-direction: column; }
.emp-panel-head b { font-size: 15px; }
.emp-panel-head span:last-child { font-size: 12px; color: var(--emp-text2); }

/* TOPICS */
.emp-topic-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(195px,1fr)); gap: 8px; }
.emp-topic {
  display: flex; align-items: center; gap: 10px;
  background: var(--emp-bg2); border: 1.5px solid var(--emp-border);
  border-radius: var(--r-sm); padding: 10px 14px; cursor: pointer;
  font-size: 13px; font-weight: 500; transition: all .15s; user-select: none;
}
.emp-topic input { display: none; }
.emp-topic-box {
  width: 18px; height: 18px; border: 2px solid var(--emp-border2);
  border-radius: 4px; flex-shrink: 0; position: relative; transition: all .15s;
}
.emp-checked { border-color: rgba(59,130,246,.5); background: var(--emp-blue-dim); }
.emp-checked .emp-topic-box {
  background: var(--emp-blue); border-color: var(--emp-blue);
}
.emp-checked .emp-topic-box::after {
  content: '✓'; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 800; color: #fff;
}

/* DIFFICULTY */
.emp-diff-row { display: flex; gap: 10px; flex-wrap: wrap; }
.emp-diff-btn {
  flex: 1; min-width: 120px; display: flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--emp-bg2); border: 1.5px solid var(--emp-border);
  border-radius: var(--r-sm); padding: 12px 16px; cursor: pointer;
  font-size: 14px; font-weight: 600; color: var(--emp-text2); transition: all .15s; user-select: none;
}
.emp-diff-btn input { display: none; }
.emp-diff-on { border-color: var(--emp-accent); background: var(--emp-accent-dim); color: var(--emp-text); }

/* SESSION ROW */
.emp-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.emp-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .8px; color: var(--emp-text2); margin-bottom: 10px; }
.emp-q-row { display: flex; gap: 8px; flex-wrap: wrap; }
.emp-q-btn {
  padding: 9px 16px; background: var(--emp-bg2); border: 1.5px solid var(--emp-border);
  border-radius: var(--r-sm); color: var(--emp-text2); font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all .15s; font-family: inherit;
}
.emp-q-btn:hover { border-color: var(--emp-border2); color: var(--emp-text); }
.emp-q-on { border-color: var(--emp-accent); background: var(--emp-accent-dim); color: var(--emp-text); }
.emp-select {
  width: 100%; background: var(--emp-bg2); border: 1px solid var(--emp-border);
  border-radius: var(--r-sm); color: var(--emp-text); padding: 11px 14px;
  font-size: 13px; font-family: inherit; cursor: pointer;
}

/* BUTTONS */
.emp-primary-btn {
  display: block; width: 100%; margin-top: 20px;
  background: linear-gradient(135deg, var(--emp-accent), var(--emp-accent-dark));
  border: none; border-radius: var(--r); color: #000;
  font-size: 17px; font-weight: 700; padding: 18px;
  cursor: pointer; font-family: inherit;
  box-shadow: 0 4px 24px rgba(212,168,67,.3);
  transition: transform .15s, box-shadow .15s;
}
.emp-primary-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(212,168,67,.45); }
.emp-primary-btn:disabled { opacity: .4; cursor: default; transform: none; box-shadow: none; }
.emp-outline-btn {
  padding: 13px 20px; background: var(--emp-surf); border: 1px solid var(--emp-border);
  color: var(--emp-text); border-radius: var(--r-sm);
  font-size: 14px; font-weight: 600; cursor: pointer; font-family: inherit;
}
.emp-outline-btn:hover { border-color: var(--emp-border2); }

/* ERROR */
.emp-error {
  background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3);
  border-radius: var(--r-sm); padding: 13px 16px; font-size: 13px;
  color: #fca5a5; margin-top: 10px; display: none;
}
.emp-error.show { display: block; }

/* LOADING */
.emp-loader-orb {
  width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 28px;
  background: var(--emp-accent-dim); border: 2px solid rgba(212,168,67,.3);
  display: flex; align-items: center; justify-content: center;
  position: relative; animation: emp-pulse 2s ease infinite;
}
.emp-loader-orb::before, .emp-loader-orb::after {
  content: ''; position: absolute; border-radius: 50%;
  border: 2px solid transparent; animation: emp-spin 1.8s linear infinite;
}
.emp-loader-orb::before { inset: 6px; border-top-color: var(--emp-accent); }
.emp-loader-orb::after  { inset: 14px; border-bottom-color: rgba(212,168,67,.5); animation-duration: 1.2s; animation-direction: reverse; }
.emp-loader-orb span { font-size: 26px; color: var(--emp-accent); z-index: 1; }
@keyframes emp-pulse { 0%,100%{box-shadow:0 0 20px rgba(212,168,67,.2)} 50%{box-shadow:0 0 40px rgba(212,168,67,.4)} }
@keyframes emp-spin  { to{transform:rotate(360deg)} }
.emp-loader-title { font-size: 22px; font-weight: 800; text-align: center; margin-bottom: 8px; }
.emp-loader-sub   { color: var(--emp-text2); font-size: 14px; text-align: center; margin-bottom: 24px; }
.emp-progress-wrap { display: flex; align-items: center; gap: 12px; max-width: 420px; margin: 0 auto 20px; }
.emp-progress-bar { flex: 1; height: 6px; background: var(--emp-border); border-radius: 3px; overflow: hidden; }
.emp-progress-fill { height: 100%; background: var(--emp-accent); border-radius: 3px; transition: width .4s ease; width: 0; }
.emp-progress-text { font-size: 13px; color: var(--emp-text2); min-width: 44px; font-family: monospace; }
.emp-loader-log {
  max-width: 420px; margin: 0 auto; display: flex; flex-direction: column; gap: 6px;
  max-height: 180px; overflow-y: auto;
}
.emp-log-item {
  display: flex; align-items: center; gap: 10px;
  background: var(--emp-surf); border: 1px solid var(--emp-border);
  border-radius: 8px; padding: 8px 14px; font-size: 12px; color: var(--emp-text2);
  animation: emp-fadein .3s ease;
}
.emp-log-item.ok  { border-color: rgba(34,197,94,.3); color: var(--emp-green); }
.emp-log-item.err { border-color: rgba(239,68,68,.3); color: #fca5a5; }
@keyframes emp-fadein { from{opacity:0;transform:translateY(6px)} to{opacity:1;transform:translateY(0)} }

/* QUIZ HEADER */
.emp-quiz-header { margin-bottom: 18px; }
.emp-tracker {
  display: flex; flex-wrap: wrap; gap: 5px;
  background: var(--emp-surf); border: 1px solid var(--emp-border);
  border-radius: var(--r); padding: 12px; margin-bottom: 10px;
}
.emp-dot {
  width: 30px; height: 30px; border-radius: 7px;
  background: var(--emp-bg2); border: 1px solid var(--emp-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700; color: var(--emp-text3);
  cursor: pointer; transition: all .15s; font-family: monospace;
}
.emp-dot:hover { border-color: var(--emp-border2); }
.emp-dot-cur  { border-color: var(--emp-accent); color: var(--emp-accent); background: var(--emp-accent-dim); }
.emp-dot-ok   { background: var(--emp-green-dim); border-color: rgba(34,197,94,.4); color: var(--emp-green); }
.emp-dot-bad  { background: var(--emp-red-dim);   border-color: rgba(239,68,68,.4);  color: var(--emp-red); }
.emp-header-row { display: flex; align-items: center; gap: 12px; }
.emp-header-prog { font-size: 12px; color: var(--emp-text2); font-family: monospace; min-width: 38px; }
.emp-thin-bar  { flex: 1; height: 4px; background: var(--emp-border); border-radius: 2px; overflow: hidden; }
.emp-thin-fill { height: 100%; background: var(--emp-accent); border-radius: 2px; transition: width .4s; width: 0; }
.emp-timer { font-family: monospace; font-size: 14px; color: var(--emp-accent); letter-spacing: 1px; }

/* QUESTION CARD */
.emp-q-card {
  background: var(--emp-surf); border: 1px solid var(--emp-border);
  border-radius: 18px; padding: 28px; margin-bottom: 14px;
  position: relative; overflow: hidden; animation: emp-fadein .3s ease;
}
.emp-q-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--emp-accent), var(--emp-blue), transparent);
}
.emp-q-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.emp-badge { font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; padding: 4px 10px; border-radius: 5px; }
.emp-badge-avg   { background: rgba(59,130,246,.15); color: #60a5fa; border: 1px solid rgba(59,130,246,.3); }
.emp-badge-hard  { background: rgba(245,158,11,.15); color: var(--emp-amber); border: 1px solid rgba(245,158,11,.3); }
.emp-badge-super { background: rgba(239,68,68,.15);  color: #f87171; border: 1px solid rgba(239,68,68,.3); }
.emp-topic-tag   { font-size: 12px; color: var(--emp-text2); background: var(--emp-surf2); border: 1px solid var(--emp-border); padding: 4px 10px; border-radius: 5px; }
.emp-q-num       { font-family: monospace; font-size: 12px; color: var(--emp-text3); margin-left: auto; }

.emp-context {
  background: var(--emp-surf2); border-left: 3px solid var(--emp-accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0; padding: 12px 16px;
  margin-bottom: 14px; font-size: 14px; color: var(--emp-text2);
}
.emp-stem { font-size: 17px; line-height: 1.8; }

.emp-choices { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.emp-choice {
  display: flex; align-items: flex-start; gap: 14px;
  background: var(--emp-bg2); border: 1.5px solid var(--emp-border);
  border-radius: var(--r-sm); padding: 13px 18px;
  cursor: pointer; font-size: 15px; line-height: 1.5;
  transition: all .18s; width: 100%; text-align: left; font-family: inherit;
  color: var(--emp-text);
}
.emp-choice:hover:not(:disabled) { border-color: var(--emp-border2); background: var(--emp-surf2); transform: translateX(3px); }
.emp-choice:disabled { cursor: default; }
.emp-choice-key {
  font-family: monospace; font-size: 12px; font-weight: 700;
  width: 26px; height: 26px; flex-shrink: 0;
  background: var(--emp-surf2); border: 1px solid var(--emp-border);
  border-radius: 6px; display: flex; align-items: center; justify-content: center;
  color: var(--emp-text2); margin-top: 1px; transition: all .15s;
}
.emp-choice-sel  { border-color: var(--emp-blue); background: var(--emp-blue-dim); }
.emp-choice-sel .emp-choice-key { background: var(--emp-blue); color: #fff; border-color: var(--emp-blue); }
.emp-choice-ok   { border-color: var(--emp-green); background: var(--emp-green-dim); }
.emp-choice-ok .emp-choice-key  { background: var(--emp-green); color: #fff; border-color: var(--emp-green); }
.emp-choice-bad  { border-color: var(--emp-red); background: var(--emp-red-dim); }
.emp-choice-bad .emp-choice-key { background: var(--emp-red); color: #fff; border-color: var(--emp-red); }

.emp-explanation {
  margin-top: 16px; background: var(--emp-surf2); border: 1px solid var(--emp-border);
  border-radius: var(--r); padding: 18px; display: none;
}
.emp-explanation.show { display: block; animation: emp-fadein .3s ease; }
.emp-exp-head { font-size: 14px; font-weight: 700; margin-bottom: 10px; }
.emp-exp-ok   { color: var(--emp-green); }
.emp-exp-bad  { color: var(--emp-red); }
.emp-exp-body { font-size: 14px; color: var(--emp-text2); line-height: 1.85; }
.emp-exp-formula {
  margin-top: 10px; background: var(--emp-bg); border: 1px solid var(--emp-border);
  border-radius: 6px; padding: 10px 14px; font-family: monospace;
  font-size: 13px; color: var(--emp-accent);
}

/* NAV */
.emp-nav { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.emp-nav-btn {
  display: flex; align-items: center; gap: 8px;
  background: var(--emp-surf); border: 1px solid var(--emp-border);
  color: var(--emp-text); border-radius: var(--r-sm); padding: 11px 18px;
  font-size: 14px; font-weight: 600; cursor: pointer; font-family: inherit;
  transition: all .15s;
}
.emp-nav-btn:hover:not(:disabled) { border-color: var(--emp-border2); background: var(--emp-surf2); }
.emp-nav-btn:disabled { opacity: .35; cursor: default; }
.emp-submit-btn {
  background: linear-gradient(135deg, var(--emp-accent), var(--emp-accent-dark));
  border: none; color: #000; padding: 11px 24px;
  border-radius: var(--r-sm); font-size: 14px; font-weight: 700;
  cursor: pointer; font-family: inherit;
  box-shadow: 0 2px 12px rgba(212,168,67,.3);
}

/* RESULTS */
.emp-results-top { display: flex; flex-direction: column; align-items: center; margin-bottom: 32px; }
.emp-score-ring { width: 140px; height: 140px; position: relative; }
.emp-score-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.emp-ring-bg   { fill: none; stroke: var(--emp-border); stroke-width: 8; }
.emp-ring-fill { fill: none; stroke-width: 8; stroke-linecap: round; transition: stroke-dashoffset 1.4s cubic-bezier(.4,0,.2,1); }
.emp-ring-inner { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.emp-ring-pct   { font-size: 30px; font-weight: 800; }
.emp-ring-lbl   { font-size: 10px; color: var(--emp-text2); text-transform: uppercase; letter-spacing: 1px; }
.emp-results-msg { text-align: center; margin-top: 18px; }
.emp-results-msg h3 { font-size: 24px; font-weight: 800; margin-bottom: 4px; }
.emp-results-msg p  { color: var(--emp-text2); font-size: 14px; }

.emp-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; margin-bottom: 28px; }
.emp-stat  { background: var(--emp-surf); border: 1px solid var(--emp-border); border-radius: var(--r); padding: 16px 12px; text-align: center; }
.emp-stat-val { font-size: 28px; font-weight: 800; }
.emp-stat-lbl { font-size: 10px; color: var(--emp-text2); text-transform: uppercase; letter-spacing: .8px; margin-top: 2px; }

.emp-review-title { font-size: 18px; font-weight: 800; margin-bottom: 14px; }
.emp-review-item  { background: var(--emp-surf); border: 1px solid var(--emp-border); border-radius: var(--r); margin-bottom: 8px; overflow: hidden; }
.emp-review-head  { display: flex; align-items: flex-start; gap: 12px; padding: 14px 18px; cursor: pointer; }
.emp-review-dot   { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; margin-top: 3px; }
.emp-review-text  { flex: 1; font-size: 13px; color: var(--emp-text2); line-height: 1.5; }
.emp-review-chev  { color: var(--emp-text3); font-size: 12px; transition: transform .2s; }
.emp-review-item.open .emp-review-chev { transform: rotate(180deg); }
.emp-review-body  { display: none; padding: 0 18px 16px; border-top: 1px solid var(--emp-border); }
.emp-review-item.open .emp-review-body { display: block; padding-top: 12px; }
.emp-review-ans   { font-size: 13px; margin-bottom: 8px; }
.emp-review-exp   { font-size: 13px; color: var(--emp-text2); line-height: 1.8; }

.emp-results-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }

@media(max-width:580px){
  .emp-root { padding: 18px 14px; }
  .emp-q-card { padding: 18px 14px; }
  .emp-stem { font-size: 15px; }
  .emp-choice { font-size: 14px; }
  .emp-row-2 { grid-template-columns: 1fr; }
  .emp-stats { grid-template-columns: 1fr 1fr; }
  .emp-diff-row { flex-direction: column; }
  .emp-topic-grid { grid-template-columns: 1fr; }
}