/* ============================================================
   EcoFlow Cuba Calculator v2 — Amazon-inspired design
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Amazon+Ember:wght@400;700&family=Lato:wght@300;400;700;900&display=swap');

/* Fallback to safe system stack if Amazon Ember not available */
.efc {
  --efc-orange:   #FF9900;
  --efc-orange-d: #e68a00;
  --efc-blue:     #146EB4;
  --efc-green:    #067D62;
  --efc-text:     #0F1111;
  --efc-text2:    #565959;
  --efc-border:   #D5D9D9;
  --efc-bg:       #F7F8F8;
  --efc-white:    #FFFFFF;
  --efc-shadow:   0 2px 8px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.08);
  --efc-shadow-hover: 0 4px 16px rgba(0,0,0,.14), 0 2px 4px rgba(0,0,0,.10);
  --efc-radius:   8px;
  --efc-tr:       0.2s ease;
  --efc-font:     'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

.efc {
  font-family: var(--efc-font);
  color: var(--efc-text);
  background: var(--efc-bg);
  padding: 1.5rem;
  max-width: 760px;
  margin: 1.5rem auto;
  border-radius: var(--efc-radius);
}

/* ── Header ─────────────────────────────── */
.efc-head { margin-bottom: 1.25rem; }

.efc-title {
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  font-weight: 900;
  color: var(--efc-text);
  line-height: 1.25;
  margin: 0 0 .6rem;
}

.efc-desc {
  font-size: .9rem;
  color: var(--efc-text2);
  line-height: 1.6;
  margin: 0;
  max-width: 640px;
}

/* ── Cards ──────────────────────────────── */
.efc-card {
  background: var(--efc-white);
  border: 1px solid var(--efc-border);
  border-radius: var(--efc-radius);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
  box-shadow: var(--efc-shadow);
}

.efc-card-header {
  display: flex;
  align-items: flex-start;
  gap: .85rem;
  margin-bottom: 1.1rem;
}

.efc-step {
  width: 26px; height: 26px;
  background: var(--efc-orange);
  color: var(--efc-text);
  font-weight: 900;
  font-size: .82rem;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: .15rem;
}

.efc-card-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--efc-text);
  line-height: 1.35;
}
.efc-card-sub {
  font-size: .78rem;
  color: var(--efc-text2);
  margin-top: .15rem;
}

/* ── Slider ─────────────────────────────── */
.efc-slider-wrap { padding: 0 .25rem; }

.efc-slider-display {
  display: flex;
  align-items: baseline;
  gap: .3rem;
  margin-bottom: 1rem;
}

.efc-watts-value {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--efc-orange);
  line-height: 1;
  transition: color var(--efc-tr);
  font-variant-numeric: tabular-nums;
}
.efc-watts-unit {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--efc-text2);
}

/* Custom range input */
.efc-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 99px;
  background: linear-gradient(to right, var(--efc-orange) 0%, var(--efc-orange) var(--pct,16.4%), #D5D9D9 var(--pct,16.4%));
  outline: none;
  cursor: pointer;
  transition: background .05s;
}
.efc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--efc-white);
  border: 3px solid var(--efc-orange);
  box-shadow: 0 1px 4px rgba(0,0,0,.2);
  cursor: grab;
  transition: transform .12s, box-shadow .12s;
}
.efc-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.15);
  box-shadow: 0 2px 8px rgba(255,153,0,.4);
}
.efc-slider::-moz-range-thumb {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--efc-white);
  border: 3px solid var(--efc-orange);
  box-shadow: 0 1px 4px rgba(0,0,0,.2);
  cursor: grab;
}

.efc-slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: .68rem;
  color: var(--efc-text2);
  margin-top: .5rem;
}

/* ── Example box ────────────────────────── */
.efc-example-box {
  margin-top: 1.1rem;
  background: #FFF8EE;
  border: 1px solid #FFE0A3;
  border-radius: var(--efc-radius);
  padding: .85rem 1rem;
}
.efc-example-label {
  font-size: .75rem;
  font-weight: 700;
  color: var(--efc-orange-d);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: .5rem;
}
.efc-example-list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: .3rem;
}
.efc-example-list li {
  font-size: .85rem;
  color: var(--efc-text);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.efc-example-list li::before {
  content: '✓';
  color: var(--efc-green);
  font-weight: 700;
  font-size: .8rem;
  flex-shrink: 0;
}

/* ── Hours ──────────────────────────────── */
.efc-hours-grid {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
}

.efc-hour-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 70px;
  padding: .65rem .4rem;
  border: 2px solid var(--efc-border);
  border-radius: var(--efc-radius);
  background: var(--efc-white);
  cursor: pointer;
  transition: border-color var(--efc-tr), background var(--efc-tr), transform var(--efc-tr);
  gap: .1rem;
}
.efc-hour-btn:hover {
  border-color: var(--efc-orange);
  transform: translateY(-1px);
  box-shadow: var(--efc-shadow-hover);
}
.efc-hour-btn.active {
  border-color: var(--efc-orange);
  background: #FFF8EE;
  box-shadow: 0 0 0 1px var(--efc-orange);
}
.efc-hour-num {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--efc-text);
  line-height: 1;
}
.efc-hour-btn.active .efc-hour-num { color: var(--efc-orange); }
.efc-hour-lbl {
  font-size: .65rem;
  color: var(--efc-text2);
  text-transform: lowercase;
}

/* ── Calculate button ───────────────────── */
.efc-calc-btn {
  width: 100%;
  padding: .85rem 1.5rem;
  background: linear-gradient(to bottom, #FFD814, #FF9900);
  border: 1px solid #C7971E;
  border-radius: var(--efc-radius);
  color: var(--efc-text);
  font-family: var(--efc-font);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  transition: filter var(--efc-tr), transform var(--efc-tr), box-shadow var(--efc-tr);
  box-shadow: 0 2px 5px rgba(213,149,30,.4);
  margin-bottom: 1rem;
}
.efc-calc-btn:hover {
  filter: brightness(1.04);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(213,149,30,.5);
}
.efc-calc-btn:active { transform: translateY(0); filter: brightness(.97); }

/* ── Result card ────────────────────────── */
.efc-result {
  background: var(--efc-white);
  border: 1px solid var(--efc-border);
  border-radius: var(--efc-radius);
  box-shadow: var(--efc-shadow);
  overflow: hidden;
}

.efc-result-inner {
  padding: 1.5rem 1.4rem;
  animation: efcSlideIn .35s cubic-bezier(.4,0,.2,1) both;
}

@keyframes efcSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.efc-result-top {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: .85rem;
}
.efc-result-check { font-size: 1.3rem; line-height: 1; }
.efc-result-heading {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--efc-green);
}

.efc-result-model {
  font-size: clamp(1.35rem, 3.5vw, 1.8rem);
  font-weight: 900;
  color: var(--efc-text);
  margin-bottom: .5rem;
  line-height: 1.2;
}

.efc-result-desc {
  font-size: .88rem;
  color: var(--efc-text2);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

/* Stats row */
.efc-result-stats {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--efc-bg);
  border: 1px solid var(--efc-border);
  border-radius: var(--efc-radius);
  overflow: hidden;
  margin-bottom: 1.25rem;
}
.efc-stat {
  flex: 1;
  padding: .85rem .6rem;
  text-align: center;
}
.efc-stat-val {
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--efc-blue);
  font-variant-numeric: tabular-nums;
  margin-bottom: .2rem;
  transition: color var(--efc-tr);
}
.efc-stat-lbl {
  font-size: .65rem;
  color: var(--efc-text2);
  line-height: 1.3;
}
.efc-stat-divider {
  width: 1px;
  background: var(--efc-border);
  align-self: stretch;
  flex-shrink: 0;
}

/* CTA button */
.efc-cta-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  width: 100%;
  padding: .85rem 1.5rem;
  background: linear-gradient(to bottom, #FFD814, #FF9900);
  border: 1px solid #C7971E;
  border-radius: var(--efc-radius);
  color: var(--efc-text);
  font-family: var(--efc-font);
  font-size: .95rem;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  transition: filter var(--efc-tr), transform var(--efc-tr), box-shadow var(--efc-tr);
  box-shadow: 0 2px 5px rgba(213,149,30,.4);
}
.efc-cta-btn:hover {
  filter: brightness(1.04);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(213,149,30,.5);
  color: var(--efc-text);
  text-decoration: none;
}

.efc-disclaimer {
  font-size: .72rem;
  color: var(--efc-text2);
  margin: .85rem 0 0;
  line-height: 1.5;
}

/* ── Responsive ─────────────────────────── */
@media (max-width: 520px) {
  .efc { padding: 1rem .85rem; }
  .efc-card { padding: 1rem; }
  .efc-result-stats { flex-wrap: wrap; }
  .efc-stat { min-width: 45%; }
  .efc-stat-divider:nth-child(4) { display: none; }
  .efc-hours-grid { gap: .4rem; }
  .efc-hour-btn { width: 60px; }
}

@media (max-width: 360px) {
  .efc-hours-grid { gap: .3rem; }
  .efc-hour-btn { width: 52px; padding: .55rem .3rem; }
  .efc-hour-num { font-size: 1.1rem; }
}