/* ═══════════════════════════════════════════════════════════════════
   percentage-tool.css - Percentage Calculator
   Scoped entirely under  #pct-root - zero bleed to other tools
   Theme: Clean Light × Emerald Green Accent
═══════════════════════════════════════════════════════════════════ */

#pct-root {
  /* Surfaces */
  --pct-bg:          #f4f7f6;
  --pct-surface:     #ffffff;
  --pct-surface2:    #f8faf9;
  --pct-surface3:    #eef3f1;

  /* Borders */
  --pct-border:      #e0e8e5;
  --pct-border2:     #c8d8d3;

  /* Accent - emerald */
  --pct-accent:      #059669;
  --pct-accent2:     #10b981;
  --pct-accent3:     #34d399;
  --pct-accent-bg:   #ecfdf5;
  --pct-accent-dim:  rgba(5, 150, 105, 0.10);
  --pct-accent-ring: rgba(5, 150, 105, 0.22);

  /* Semantic */
  --pct-pos:         #059669;
  --pct-pos-bg:      #ecfdf5;
  --pct-neg:         #dc2626;
  --pct-neg-bg:      #fef2f2;
  --pct-err:         #b91c1c;
  --pct-err-bg:      #fff1f2;
  --pct-err-border:  #fecaca;

  /* Text */
  --pct-text:        #0f1f1a;
  --pct-text2:       #3d5a52;
  --pct-text3:       #88aaa0;
  --pct-mono:        #1a3d32;

  /* Type */
  --pct-sans: 'Plus Jakarta Sans', 'DM Sans', system-ui, sans-serif;
  --pct-mono-font: 'DM Mono', 'JetBrains Mono', monospace;

  /* Shape */
  --pct-radius:    12px;
  --pct-radius-sm:  8px;
  --pct-radius-xs:  5px;

  /* Shadow */
  --pct-shadow:    0 1px 3px rgba(0,0,0,.06), 0 4px 18px rgba(0,0,0,.06);
  --pct-shadow-md: 0 4px 24px rgba(0,0,0,.09);
  --pct-ring:      0 0 0 3px var(--pct-accent-ring);

  --pct-ease: cubic-bezier(0.4, 0, 0.2, 1);

  font-family: var(--pct-sans);
  background:  var(--pct-bg);
  color:       var(--pct-text);
  min-height:  100vh;
  box-sizing:  border-box;
}
#pct-root *, #pct-root *::before, #pct-root *::after { box-sizing: inherit; }

/* scrollbar */
#pct-root ::-webkit-scrollbar { width: 5px; height: 5px; }
#pct-root ::-webkit-scrollbar-track { background: var(--pct-surface2); }
#pct-root ::-webkit-scrollbar-thumb { background: var(--pct-border2); border-radius: 3px; }

/* ── Hero ──────────────────────────────────────────────────────── */
.pct-hero {
  background: linear-gradient(135deg, #064e3b 0%, #065f46 50%, #059669 100%);
  padding: 52px 24px 44px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.pct-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 26px 26px;
  pointer-events: none;
}
.pct-hero-inner { position: relative; z-index: 1; max-width: 620px; margin: 0 auto; }

.pct-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.22);
  color: #a7f3d0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  padding: 4px 13px;
  border-radius: 100px;
  margin-bottom: 18px;
}
.pct-hero-badge svg { width: 12px; height: 12px; }

.pct-hero h1 {
  font-size: clamp(26px, 5vw, 44px);
  font-weight: 800;
  letter-spacing: -.03em;
  color: #fff;
  margin: 0 0 12px;
  line-height: 1.1;
}
.pct-hero h1 span { color: #6ee7b7; }
.pct-hero p {
  font-size: clamp(13px, 2vw, 15px);
  color: rgba(255,255,255,.72);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Layout ────────────────────────────────────────────────────── */
.pct-app { max-width: 860px; margin: 0 auto; padding: 26px 18px 70px; }

/* ── Mode Tabs ─────────────────────────────────────────────────── */
.pct-tabs {
  display: flex;
  gap: 4px;
  background: var(--pct-surface);
  border: 1px solid var(--pct-border);
  border-radius: var(--pct-radius);
  padding: 5px;
  box-shadow: var(--pct-shadow);
  margin-bottom: 20px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.pct-tabs::-webkit-scrollbar { height: 0; }

.pct-tab {
  flex: 1;
  min-width: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 12px;
  border: none;
  border-radius: var(--pct-radius-sm);
  font-family: var(--pct-sans);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--pct-text2);
  background: transparent;
  cursor: pointer;
  transition: all .15s var(--pct-ease);
  white-space: nowrap;
  line-height: 1;
}
.pct-tab svg { width: 13px; height: 13px; flex-shrink: 0; }
.pct-tab:hover { background: var(--pct-surface2); color: var(--pct-text); }
.pct-tab.is-active {
  background: var(--pct-accent);
  color: #fff;
  box-shadow: 0 2px 8px var(--pct-accent-dim);
}

/* ── Calculator Card ───────────────────────────────────────────── */
.pct-card {
  background: var(--pct-surface);
  border: 1px solid var(--pct-border);
  border-radius: var(--pct-radius);
  box-shadow: var(--pct-shadow);
  overflow: hidden;
  margin-bottom: 16px;
}
.pct-card-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--pct-border);
  background: var(--pct-surface2);
}
.pct-card-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--pct-text2);
  flex: 1;
}
.pct-card-icon { width: 15px; height: 15px; color: var(--pct-accent); flex-shrink: 0; }
.pct-card-body { padding: 22px 20px; }

/* ── Mode panels ───────────────────────────────────────────────── */
.pct-mode-panel { display: none; }
.pct-mode-panel.is-active { display: block; }

/* Sentence-style layout */
.pct-sentence {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--pct-text);
  line-height: 1.4;
  margin-bottom: 22px;
}
.pct-sentence-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--pct-text2);
}

/* Number inputs inline */
.pct-num-wrap {
  display: inline-flex;
  align-items: center;
  position: relative;
}
.pct-num-input {
  width: 110px;
  padding: 9px 12px;
  background: var(--pct-accent-bg);
  border: 1.5px solid var(--pct-accent-dim);
  border-radius: var(--pct-radius-sm);
  font-family: var(--pct-mono-font);
  font-size: 15px;
  font-weight: 600;
  color: var(--pct-accent);
  text-align: center;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  -moz-appearance: textfield;
}
.pct-num-input::-webkit-outer-spin-button,
.pct-num-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.pct-num-input:focus {
  border-color: var(--pct-accent2);
  box-shadow: var(--pct-ring);
  background: #fff;
}
.pct-num-input::placeholder { color: var(--pct-text3); font-family: var(--pct-sans); font-size: 13px; }

.pct-pct-badge {
  font-size: 13px;
  font-weight: 700;
  color: var(--pct-accent);
  background: var(--pct-accent-bg);
  border: 1px solid var(--pct-border2);
  border-radius: var(--pct-radius-xs);
  padding: 4px 8px;
}

/* Mode 3 toggle */
.pct-dir-toggle {
  display: flex;
  gap: 4px;
  background: var(--pct-surface2);
  border: 1px solid var(--pct-border);
  border-radius: var(--pct-radius-sm);
  padding: 3px;
}
.pct-dir-btn {
  padding: 7px 16px;
  border: none;
  border-radius: 6px;
  font-family: var(--pct-sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .14s var(--pct-ease);
  background: transparent;
  color: var(--pct-text2);
}
.pct-dir-btn.is-active {
  background: var(--pct-surface);
  color: var(--pct-text);
  box-shadow: var(--pct-shadow);
}
.pct-dir-btn.inc.is-active { color: var(--pct-pos); }
.pct-dir-btn.dec.is-active { color: var(--pct-neg); }

/* ── Result Box ────────────────────────────────────────────────── */
.pct-result-box {
  margin-top: 18px;
  border-radius: var(--pct-radius-sm);
  border: 1.5px solid var(--pct-border);
  overflow: hidden;
  transition: border-color .2s;
}
.pct-result-box.has-result { border-color: var(--pct-accent2); }

.pct-result-main {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--pct-surface);
}
.pct-result-label {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--pct-text3);
  white-space: nowrap;
}
.pct-result-value {
  font-family: var(--pct-mono-font);
  font-size: 30px;
  font-weight: 700;
  color: var(--pct-text3);
  flex: 1;
  letter-spacing: -.02em;
  transition: color .18s, font-size .1s;
}
.pct-result-value.has-val { color: var(--pct-accent); }
.pct-result-value.is-pos  { color: var(--pct-pos); }
.pct-result-value.is-neg  { color: var(--pct-neg); }

.pct-copy-btn {
  background: none;
  border: 1px solid var(--pct-border2);
  border-radius: var(--pct-radius-xs);
  color: var(--pct-text3);
  cursor: pointer;
  padding: 7px 12px;
  font-family: var(--pct-sans);
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all .14s;
  white-space: nowrap;
  flex-shrink: 0;
}
.pct-copy-btn svg { width: 12px; height: 12px; }
.pct-copy-btn:hover { background: var(--pct-accent-bg); border-color: var(--pct-accent2); color: var(--pct-accent); }
.pct-copy-btn.copied { background: var(--pct-pos-bg); border-color: var(--pct-pos); color: var(--pct-pos); }

/* Result explanation */
.pct-result-explain {
  padding: 12px 18px;
  background: var(--pct-accent-bg);
  border-top: 1px solid var(--pct-border);
  font-size: 13.5px;
  color: var(--pct-text2);
  line-height: 1.65;
  display: none;
}
.pct-result-box.has-result .pct-result-explain { display: block; }
.pct-explain-formula {
  font-family: var(--pct-mono-font);
  font-size: 12px;
  color: var(--pct-accent);
  background: rgba(5,150,105,.08);
  padding: 2px 7px;
  border-radius: 4px;
}

/* ── History ───────────────────────────────────────────────────── */
.pct-history-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.pct-history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--pct-border);
  font-size: 13.5px;
  transition: background .12s;
  animation: pct-slide-in .22s ease both;
}
@keyframes pct-slide-in {
  from { opacity: 0; transform: translateY(-5px); }
  to   { opacity: 1; transform: translateY(0); }
}
.pct-history-item:last-child { border-bottom: none; }
.pct-history-item:hover { background: var(--pct-surface2); }
.pct-history-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  background: var(--pct-accent-bg);
  color: var(--pct-accent);
  border: 1px solid var(--pct-border2);
  padding: 2px 7px;
  border-radius: 100px;
  flex-shrink: 0;
}
.pct-history-expr { flex: 1; color: var(--pct-text2); }
.pct-history-ans {
  font-family: var(--pct-mono-font);
  font-size: 13px;
  font-weight: 700;
  color: var(--pct-accent);
  flex-shrink: 0;
}
.pct-history-empty {
  text-align: center;
  padding: 24px 16px;
  font-size: 13.5px;
  color: var(--pct-text3);
}

/* ── Formula Reference ─────────────────────────────────────────── */
.pct-formula-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
  padding: 16px;
}
.pct-formula-card {
  background: var(--pct-surface);
  border: 1px solid var(--pct-border);
  border-left: 3px solid var(--pct-accent);
  border-radius: var(--pct-radius-sm);
  padding: 13px 14px;
}
.pct-formula-card h4 { font-size: 12.5px; font-weight: 700; color: var(--pct-accent); margin: 0 0 5px; }
.pct-formula-card code {
  display: block;
  font-family: var(--pct-mono-font);
  font-size: 12px;
  color: var(--pct-mono);
  background: var(--pct-surface2);
  border: 1px solid var(--pct-border);
  border-radius: 4px;
  padding: 5px 8px;
  margin-bottom: 5px;
}
.pct-formula-card p { font-size: 12px; color: var(--pct-text2); margin: 0; line-height: 1.5; }

/* ── SEO ───────────────────────────────────────────────────────── */
.pct-seo {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--pct-border);
}
.pct-seo h2 { font-size: clamp(17px, 2.5vw, 21px); font-weight: 800; color: var(--pct-text); margin: 0 0 10px; letter-spacing: -.015em; }
.pct-seo h3 { font-size: 15px; font-weight: 700; color: var(--pct-text); margin: 22px 0 8px; }
.pct-seo p  { font-size: 14px; color: var(--pct-text2); line-height: 1.78; margin: 0 0 10px; }
.pct-seo code { font-family: var(--pct-mono-font); font-size: 12.5px; background: var(--pct-surface2); border: 1px solid var(--pct-border); border-radius: 4px; padding: 1px 6px; color: var(--pct-accent); }

.pct-faq-item { border-bottom: 1px solid var(--pct-border); }
.pct-faq-q { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 14px 0; cursor: pointer; font-size: 14px; font-weight: 600; color: var(--pct-text); user-select: none; transition: color .14s; }
.pct-faq-q:hover { color: var(--pct-accent); }
.pct-faq-chevron { flex-shrink: 0; color: var(--pct-text3); transition: transform .18s var(--pct-ease); }
.pct-faq-item.is-open .pct-faq-chevron { transform: rotate(180deg); }
.pct-faq-a { font-size: 13.5px; line-height: 1.75; color: var(--pct-text2); padding-bottom: 14px; display: none; }
.pct-faq-item.is-open .pct-faq-a { display: block; }

/* ── Toast ─────────────────────────────────────────────────────── */
.pct-toast {
  position: fixed; bottom: 22px; left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: #0f1f1a; color: #e2f5ee;
  font-size: 13.5px; font-weight: 600;
  padding: 10px 20px; border-radius: 100px;
  box-shadow: 0 4px 20px rgba(0,0,0,.25);
  opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 9999; white-space: nowrap;
  display: flex; align-items: center; gap: 7px;
}
.pct-toast svg { width: 14px; height: 14px; }
.pct-toast.is-visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .pct-hero { padding: 38px 16px 30px; }
  .pct-app  { padding: 16px 12px 60px; }
  .pct-sentence { font-size: 15px; gap: 8px; }
  .pct-num-input { width: 95px; font-size: 14px; }
  .pct-result-value { font-size: 24px; }
  .pct-tabs { flex-wrap: nowrap; }
  .pct-tab  { min-width: 90px; font-size: 11.5px; padding: 8px 8px; }
  .pct-formula-grid { grid-template-columns: 1fr 1fr; }
  .pct-card-body { padding: 16px 14px; }
}
@media (max-width: 420px) {
  .pct-tab span { display: none; }
  .pct-tab { min-width: 44px; padding: 9px; gap: 0; }
  .pct-formula-grid { grid-template-columns: 1fr; }
}