/* =========================================================================
   core.css — โหลดทุกหน้า
   มีเฉพาะ: reset, design tokens, body/font, .site-header, .site-footer
   ห้ามใส่ style ที่เฉพาะหน้าใดหน้าหนึ่งในนี้ — ให้แต่ละหน้ามี CSS ของตัวเอง
   ========================================================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:        #2563EB;
  --blue-dark:   #1D4ED8;
  --text:        #0F172A;
  --text-soft:   #334155;
  --muted:       #64748B;
  --border:      #E2E8F0;
  --border-soft: #EEF2F6;
  --radius:      12px;
  --radius-lg:   18px;
  --shadow-pill: 0 1px 3px rgba(15,23,42,0.05), 0 6px 18px rgba(15,23,42,0.06);
}

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: "Google Sans", "Sarabun", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* container default — แต่ละหน้า override ได้ */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* === Site header (pill bar) === */
.site-header {
  padding: 1rem 1.25rem 0.5rem;
  background: transparent;
}
.site-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  background: #fff;
  border-radius: 999px;
  padding: 0.7rem 1.5rem;
  box-shadow: var(--shadow-pill);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-logo {
  font-weight: 700;
  color: var(--blue);
  text-decoration: none;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

/* === Site footer === */
.site-footer {
  padding: 2.5rem 1rem 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 2rem;
}

/* =========================================================================
   Shared: Calculator result fresh-pulse
   เมื่อ user กดปุ่ม "คำนวณ"/"แปลง" → JS เพิ่ม class .is-fresh ที่ .calc-result
     1. Animation: ผลลัพธ์ขยับขึ้นเล็กน้อย (subtle pop)
     2. Badge "✓ คำนวณใหม่" ลอยเข้ามาด้านบน fade in/out
   ใช้ใน app.js → focusResult() (called จาก button onclick)
   ========================================================================= */
@keyframes resultFreshPop {
  0%   { transform: translateY(6px) scale(0.985); opacity: 0.85; }
  60%  { transform: translateY(-1px) scale(1.005); }
  100% { transform: translateY(0) scale(1); opacity: 1; }
}
@keyframes resultFreshBadge {
  0%   { opacity: 0; transform: translate(-50%, -10px) scale(0.92); }
  18%  { opacity: 1; transform: translate(-50%, 0) scale(1); }
  82%  { opacity: 1; transform: translate(-50%, 0) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -8px) scale(0.95); }
}

.calc-result.is-fresh .result-content {
  animation: resultFreshPop 0.6s cubic-bezier(0.34, 1.4, 0.64, 1);
}

.calc-result.is-fresh .result-content { position: relative; }
.calc-result.is-fresh .result-content::before {
  content: "✓ คำนวณใหม่";
  position: absolute;
  top: -16px;
  left: 50%;
  z-index: 5;
  padding: 0.34rem 0.95rem;
  background: var(--blue, #2563EB);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.18);
  pointer-events: none;
  animation: resultFreshBadge 1.8s ease-out forwards;
  transform: translate(-50%, 0);
}

/* Mobile: badge ลงมาให้ห่างขอบนิดนึงเพราะ scroll-into-view ทำให้ขอบบนเป็น viewport */
@media (max-width: 768px) {
  .calc-result.is-fresh .result-content::before { top: 8px; }
}

/* Reduce motion: ปิด animation ตาม OS preference */
@media (prefers-reduced-motion: reduce) {
  .calc-result.is-fresh .result-content,
  .calc-result.is-fresh .result-content::before {
    animation: none;
  }
}

/* =========================================================================
   Shared utilities — Glossary (DefinedTerm) + Related tools
   เน้น AI grounding (ChatGPT/Perplexity ใช้ดึงคำตอบ) + SEO internal linking
   ใช้ใน accordion content ของทุก tool — สีตาม --primary-* ของแต่ละ tool
   ========================================================================= */
.glossary {
  margin: 0;
  display: grid;
  gap: 0.85rem;
}
.glossary dt {
  font-weight: 700;
  color: var(--primary-text, var(--text));
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}
.glossary dd {
  margin: 0 0 0.35rem;
  color: var(--text-soft);
  font-size: 0.92rem;
  line-height: 1.7;
  padding-left: 0.85rem;
  border-left: 2px solid var(--accent-light, var(--border));
}
.glossary dd strong { color: var(--text); }

.related-tools {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}
.related-tools li a {
  display: block;
  padding: 0.85rem 1rem;
  background: var(--primary-bg, #F8FAFC);
  border: 1px solid var(--accent-light, var(--border));
  border-radius: 10px;
  color: var(--primary-text, var(--text));
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: transform 0.15s, border-color 0.15s, background 0.15s;
}
.related-tools li a:hover {
  transform: translateX(2px);
  border-color: var(--blue);
  background: var(--primary-mid, var(--primary-bg));
}