/* SF24 Engagement Rate Checker — Aurora Bento Light */
:root {
  --eng-bg: #f3f1ec;
  --eng-sf: #ffffff;
  --eng-bd: rgba(80, 40, 140, 0.10);
  --eng-bd-strong: rgba(80, 40, 140, 0.18);
  --eng-ac: #7c3aed;
  --eng-ac2: #8b5cf6;
  --eng-gold: #EDC432;
  --eng-orange: #f58529;
  --eng-pink: #DD2A7B;
  --eng-tx: #1a1033;
  --eng-ts: #6b6589;
  --eng-tm: #9f9bb5;
  --eng-r: 16px;
  --eng-rl: 22px;
  --eng-sh: 0 1px 3px rgba(80, 40, 140, .06), 0 8px 28px rgba(80, 40, 140, .06);
  --eng-sh-lift: 0 4px 14px rgba(80, 40, 140, .08), 0 18px 44px rgba(80, 40, 140, .10);
  --eng-fh: 'Rubik', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --eng-fb: 'Nunito', 'Inter', system-ui, sans-serif;
}

.sf24-eng {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px clamp(16px, 3vw, 56px) 80px;
  font-family: var(--eng-fb);
  color: var(--eng-tx);
  box-sizing: border-box;
}
.sf24-eng * { box-sizing: border-box; }

/* === HERO === */
.sf24-eng-hero {
  text-align: center;
  padding: 48px 24px 40px;
  margin-bottom: 28px;
  background:
    radial-gradient(circle at 20% 0%, rgba(124, 58, 237, .08) 0%, transparent 55%),
    radial-gradient(circle at 80% 0%, rgba(245, 133, 41, .06) 0%, transparent 55%);
  border-radius: 28px;
}
.sf24-eng-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px 7px 11px;
  background: rgba(255, 255, 255, .9);
  border: 1px solid var(--eng-bd-strong);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  font-size: 12.5px; font-weight: 700;
  color: var(--eng-tx);
  margin-bottom: 24px;
  box-shadow: 0 6px 18px -8px rgba(124, 58, 237, .18);
  letter-spacing: -.005em;
}
.sf24-eng-pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: #10b981;
  animation: sf24-eng-pulse 1.6s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes sf24-eng-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, .65); }
  50% { box-shadow: 0 0 0 7px rgba(16, 185, 129, 0); }
}
.sf24-eng-h1 {
  font-family: var(--eng-fh);
  font-size: clamp(34px, 5.8vw, 60px);
  font-weight: 900;
  line-height: 0.98;
  margin: 0 0 18px;
  letter-spacing: -0.025em;
}
.sf24-eng-h1 em {
  font-style: italic;
  background: linear-gradient(135deg, var(--eng-pink) 0%, var(--eng-orange) 50%, var(--eng-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}
.sf24-eng-sub {
  max-width: 620px;
  margin: 0 auto 28px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.55;
  color: var(--eng-ts);
  font-weight: 500;
}

/* INPUT FORM */
.sf24-eng-form {
  display: flex; gap: 10px;
  max-width: 540px;
  margin: 0 auto;
  align-items: stretch;
}
.sf24-eng-input-wrap {
  flex: 1;
  position: relative;
  display: flex; align-items: center;
  background: #fff;
  border: 1.5px solid var(--eng-bd-strong);
  border-radius: 14px;
  transition: border-color .15s, box-shadow .15s;
  overflow: hidden;
  min-height: 56px;
}
.sf24-eng-input-wrap:focus-within {
  border-color: var(--eng-ac);
  box-shadow: 0 0 0 4px rgba(124, 58, 237, .15);
}
.sf24-eng-at {
  padding: 0 4px 0 18px;
  font-family: var(--eng-fh);
  font-size: 18px;
  font-weight: 700;
  color: var(--eng-tm);
}
.sf24-eng-input-wrap input {
  flex: 1;
  border: 0; outline: 0;
  background: transparent;
  font-family: var(--eng-fh);
  font-size: 17px;
  font-weight: 600;
  color: var(--eng-tx);
  padding: 14px 18px 14px 4px;
  width: 100%;
}
.sf24-eng-input-wrap input::placeholder { color: var(--eng-tm); font-weight: 500; }
.sf24-eng-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 0 26px;
  background: linear-gradient(135deg, var(--eng-orange) 0%, #f59e0b 100%);
  color: #fff !important;
  border: 0;
  border-radius: 14px;
  font-family: var(--eng-fh);
  font-size: 15px; font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 18px -4px rgba(245, 133, 41, .45);
  transition: transform .2s, box-shadow .2s;
  min-width: 130px;
  min-height: 56px;
}
.sf24-eng-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -6px rgba(245, 133, 41, .6);
}
.sf24-eng-btn:disabled { opacity: .7; cursor: wait; }
.sf24-eng-btn-spinner { display: none; }
.sf24-eng-btn-spinner svg { animation: sf24-eng-spin 0.9s linear infinite; }
.sf24-loading .sf24-eng-btn-spinner { display: inline-flex; }
.sf24-loading .sf24-eng-btn-text { display: none; }
@keyframes sf24-eng-spin { to { transform: rotate(360deg); } }
.sf24-eng-msg {
  margin: 14px auto 0;
  max-width: 540px;
  font-size: 13.5px;
  font-weight: 600;
  text-align: center;
  min-height: 18px;
}
.sf24-eng-msg.is-error { color: #dc2626; }
.sf24-eng-msg.is-success { color: #059669; }
.sf24-eng-msg.is-info { color: var(--eng-ac); }

@media (max-width: 540px) {
  .sf24-eng-form { flex-direction: column; }
  .sf24-eng-btn { width: 100%; }
}

/* === RESULT === */
.sf24-eng-result {
  margin-bottom: 48px;
  padding: 28px clamp(20px, 3vw, 36px) 32px;
  background: var(--eng-sf);
  border: 1px solid var(--eng-bd);
  border-radius: var(--eng-rl);
  box-shadow: var(--eng-sh-lift);
  position: relative;
  overflow: hidden;
}
.sf24-eng-result::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--eng-ac) 0%, var(--eng-pink) 50%, var(--eng-orange) 100%);
}
.sf24-eng-result-head {
  display: flex; flex-wrap: wrap; gap: 12px;
  align-items: center;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--eng-bd);
}
.sf24-eng-result-handle {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-family: var(--eng-fh);
  font-size: 17px;
  font-weight: 700;
  color: var(--eng-tx);
}
.sf24-eng-result-at { color: var(--eng-tm); font-weight: 500; }
.sf24-eng-result-tier {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(124, 58, 237, .1);
  color: var(--eng-ac);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.sf24-eng-result-cached {
  display: inline-flex;
  padding: 4px 10px;
  background: rgba(245, 133, 41, .1);
  color: #b8530a;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
}

/* Big ER number card */
.sf24-eng-er-card {
  text-align: center;
  padding: 32px 16px 28px;
  background: linear-gradient(135deg, rgba(124, 58, 237, .04) 0%, rgba(245, 133, 41, .04) 100%);
  border-radius: 18px;
  margin-bottom: 22px;
}
.sf24-eng-er-num {
  display: flex; align-items: baseline; justify-content: center; gap: 4px;
  margin-bottom: 12px;
}
.sf24-eng-er-value {
  font-family: var(--eng-fh);
  font-size: clamp(56px, 11vw, 96px);
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--eng-pink) 0%, var(--eng-orange) 50%, var(--eng-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}
.sf24-eng-er-pct {
  font-family: var(--eng-fh);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  color: var(--eng-tm);
}
.sf24-eng-er-meta {
  display: flex; flex-direction: column; gap: 8px; align-items: center;
  margin-bottom: 12px;
}
.sf24-eng-er-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--eng-tm);
}
.sf24-eng-er-rating {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  font-family: var(--eng-fh);
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.sf24-eng-er-bench {
  font-size: 12.5px;
  color: var(--eng-ts);
  font-weight: 600;
}

/* Stats grid */
.sf24-eng-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 22px;
}
@media (max-width: 600px) {
  .sf24-eng-stat-grid { grid-template-columns: repeat(2, 1fr); }
}
.sf24-eng-stat {
  display: flex; flex-direction: column; gap: 4px;
  padding: 14px 16px;
  background: var(--eng-bg);
  border: 1px solid var(--eng-bd);
  border-radius: 12px;
  text-align: center;
}
.sf24-eng-stat-label {
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--eng-tm);
}
.sf24-eng-stat strong {
  font-family: var(--eng-fh);
  font-size: 22px;
  font-weight: 800;
  color: var(--eng-tx);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

/* Reels comparison */
.sf24-eng-reels {
  padding: 22px 22px 18px;
  background: var(--eng-bg);
  border: 1px solid var(--eng-bd);
  border-radius: 16px;
}
.sf24-eng-reels-title {
  font-family: var(--eng-fh);
  font-size: 14px;
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--eng-ts);
}
.sf24-eng-bars {
  display: flex; flex-direction: column; gap: 12px;
  margin-bottom: 18px;
}
.sf24-eng-bar-row {
  display: grid;
  grid-template-columns: 110px 1fr 60px;
  align-items: center;
  gap: 12px;
}
.sf24-eng-bar-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--eng-tx);
}
.sf24-eng-bar-count { color: var(--eng-tm); font-weight: 600; }
.sf24-eng-bar-track {
  height: 10px;
  background: rgba(124, 58, 237, .08);
  border-radius: 5px;
  overflow: hidden;
}
.sf24-eng-bar-fill {
  display: block;
  height: 100%;
  border-radius: 5px;
  transition: width .8s cubic-bezier(.34,1.56,.64,1);
}
.sf24-eng-bar-fill--posts { background: linear-gradient(90deg, var(--eng-ac), var(--eng-ac2)); }
.sf24-eng-bar-fill--reels { background: linear-gradient(90deg, var(--eng-pink), var(--eng-orange)); }
.sf24-eng-bar-pct {
  font-family: var(--eng-fh);
  font-size: 13px;
  font-weight: 800;
  color: var(--eng-tx);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.sf24-eng-reels-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding-top: 14px;
  border-top: 1px dashed var(--eng-bd);
}
@media (max-width: 540px) { .sf24-eng-reels-stats { grid-template-columns: 1fr; } }
.sf24-eng-reels-stats > div {
  display: flex; flex-direction: column; gap: 2px;
  text-align: center;
}
.sf24-eng-reels-stats span {
  font-size: 10.5px; font-weight: 800;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--eng-tm);
}
.sf24-eng-reels-stats strong {
  font-family: var(--eng-fh);
  font-size: 16px;
  font-weight: 800;
  color: var(--eng-tx);
  font-variant-numeric: tabular-nums;
}

/* === SECTIONS === */
.sf24-eng-h2 {
  font-family: var(--eng-fh);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.sf24-eng-eyebrow-sm {
  display: inline-block;
  font-size: 11px; font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--eng-ac);
  background: rgba(124, 58, 237, .08);
  padding: 5px 11px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.sf24-eng-sub-sm {
  font-size: 14.5px;
  color: var(--eng-ts);
  line-height: 1.55;
  font-weight: 500;
  max-width: 720px;
  margin: 0 0 18px;
}

.sf24-eng-explain { margin-bottom: 36px; }
.sf24-eng-formula {
  margin: 8px 0 14px;
  padding: 18px 22px;
  background: linear-gradient(135deg, rgba(124, 58, 237, .06) 0%, rgba(237, 196, 50, .06) 100%);
  border: 1px dashed rgba(124, 58, 237, .25);
  border-radius: 14px;
  font-family: 'JetBrains Mono', 'Menlo', monospace;
  font-size: 14px;
  color: var(--eng-tx);
  text-align: center;
}
.sf24-eng-formula code { font-family: inherit; }
.sf24-eng-formula strong { color: var(--eng-ac); font-weight: 800; }

/* Benchmark table */
.sf24-eng-bench { margin-bottom: 40px; }
.sf24-eng-bench-table {
  background: var(--eng-sf);
  border: 1px solid var(--eng-bd);
  border-radius: var(--eng-rl);
  overflow: hidden;
  box-shadow: var(--eng-sh);
}
.sf24-eng-bench-row {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.9fr 0.9fr 0.9fr;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--eng-bd);
  font-size: 13.5px;
  color: var(--eng-tx);
}
.sf24-eng-bench-row:last-child { border-bottom: 0; }
.sf24-eng-bench-row strong { font-family: var(--eng-fh); font-weight: 800; }
.sf24-eng-bench-row .is-best { color: #059669; font-weight: 700; }
.sf24-eng-bench-head {
  background: linear-gradient(135deg, rgba(124, 58, 237, .04), rgba(245, 133, 41, .04));
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--eng-ts);
}
@media (max-width: 720px) {
  .sf24-eng-bench-row {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 4px 10px;
    font-size: 13px;
  }
  .sf24-eng-bench-head { display: none; }
  .sf24-eng-bench-row > div:nth-child(1) { grid-column: 1 / 3; font-weight: 700; }
}

/* WHY 3-cards */
.sf24-eng-why { margin-bottom: 40px; }
.sf24-eng-why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.sf24-eng-why-card {
  background: var(--eng-sf);
  border: 1px solid var(--eng-bd);
  border-radius: var(--eng-rl);
  padding: 22px 22px 20px;
  box-shadow: var(--eng-sh);
}
.sf24-eng-why-card h3 {
  font-family: var(--eng-fh);
  font-size: 16px;
  font-weight: 800;
  margin: 0 0 6px;
  letter-spacing: -0.005em;
  color: var(--eng-tx);
}
.sf24-eng-why-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--eng-ts);
  font-weight: 500;
}

/* Improve list */
.sf24-eng-improve { margin-bottom: 40px; }
.sf24-eng-improve-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.sf24-eng-improve-list li {
  display: grid;
  grid-template-columns: 48px 1fr;
  grid-template-rows: auto auto;
  gap: 4px 16px;
  padding: 18px 22px;
  background: var(--eng-sf);
  border: 1px solid var(--eng-bd);
  border-radius: var(--eng-rl);
  box-shadow: var(--eng-sh);
}
.sf24-eng-improve-num {
  grid-row: 1 / 3;
  grid-column: 1;
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--eng-ac), var(--eng-ac2));
  color: #fff;
  border-radius: 10px;
  font-family: var(--eng-fh);
  font-size: 15px;
  font-weight: 800;
  margin-top: 2px;
  box-shadow: 0 4px 12px -4px rgba(124, 58, 237, .4);
}
.sf24-eng-improve-list li h3 {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--eng-fh);
  font-size: 16px;
  font-weight: 800;
  margin: 0 0 4px;
  letter-spacing: -0.005em;
  color: var(--eng-tx);
}
.sf24-eng-improve-list li p {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--eng-ts);
  font-weight: 500;
}

/* CTA */
.sf24-eng-cta { margin-top: 8px; }
.sf24-eng-cta-card {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  padding: 32px clamp(24px, 3vw, 40px);
  background: linear-gradient(135deg, #1a1033 0%, #2d1b4d 60%, #4a2d6e 100%);
  border-radius: var(--eng-rl);
  color: #fff;
  overflow: hidden;
}
.sf24-eng-cta-card::before {
  content: '';
  position: absolute;
  top: -40%; right: -10%;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(245, 133, 41, .3) 0%, transparent 60%);
  pointer-events: none;
}
.sf24-eng-cta-card::after {
  content: '';
  position: absolute;
  bottom: -50%; left: -5%;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(124, 58, 237, .3) 0%, transparent 60%);
  pointer-events: none;
}
.sf24-eng-cta-text { position: relative; z-index: 1; }
.sf24-eng-cta-text h2 {
  font-family: var(--eng-fh);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  margin: 0 0 6px;
  color: #fff;
  letter-spacing: -0.018em;
}
.sf24-eng-cta-text p {
  margin: 0;
  font-size: 14.5px;
  color: rgba(255, 255, 255, .78);
  font-weight: 500;
}
.sf24-eng-cta-btn {
  position: relative;
  z-index: 1;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 22px;
  background: linear-gradient(135deg, var(--eng-orange) 0%, #f59e0b 100%);
  color: #fff !important;
  text-decoration: none !important;
  font-family: var(--eng-fh);
  font-size: 14.5px;
  font-weight: 700;
  border-radius: 12px;
  flex-shrink: 0;
  transition: transform .2s, box-shadow .2s;
  box-shadow: 0 6px 18px -4px rgba(245, 133, 41, .45);
}
.sf24-eng-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -6px rgba(245, 133, 41, .6);
  color: #fff !important;
}

/* MOBILE TUNING */
@media (max-width: 720px) {
  .sf24-eng { padding: 12px 12px 60px; }
  .sf24-eng-hero { padding: 32px 16px 28px; margin-bottom: 22px; }
  .sf24-eng-result { padding: 22px 18px 24px; }
  .sf24-eng-cta-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }
  .sf24-eng-cta-btn { width: 100%; justify-content: center; }
  .sf24-eng-bar-row { grid-template-columns: 80px 1fr 50px; }
}