/* Thai Toolbox — สไตล์กลางที่ทุกหน้าเครื่องมือใช้ร่วมกัน
   หน้าเครื่องมือแต่ละหน้าใส่เฉพาะ CSS เฉพาะตัวของมันเองเพิ่มใน <style> */

:root {
  --bg: #0f172a;
  --bg2: #1e293b;
  --card: rgba(30, 41, 59, 0.6);
  --card-solid: rgba(30, 41, 59, 0.85);
  --card-hover: rgba(30, 41, 59, 0.9);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent2: #818cf8;
  --up: #34d399;
  --down: #fb7185;
  --warn: #fbbf24;
  --border: rgba(148, 163, 184, 0.18);
  --border-strong: rgba(148, 163, 184, 0.38);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  --glow: 0 0 0 1px rgba(56, 189, 248, 0.4), 0 12px 40px rgba(56, 189, 248, 0.15);
  /* เขียนเป็น rgba ตรง ๆ แทน color-mix() เพราะแท็บเล็ต/เบราว์เซอร์รุ่นเก่ายังไม่รองรับ */
  --nav-bg: rgba(15, 23, 42, 0.72);
  --out-bg: rgba(56, 189, 248, 0.08);
  --dot-ring: rgba(52, 211, 153, 0.25);
  --badge-ready-bg: rgba(52, 211, 153, 0.15);
  --badge-soon-bg: rgba(148, 163, 184, 0.14);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --bg2: #e2e8f0;
    --card: rgba(255, 255, 255, 0.75);
    --card-solid: rgba(255, 255, 255, 0.95);
    --card-hover: rgba(255, 255, 255, 1);
    --text: #0f172a;
    --muted: #64748b;
    --accent: #0284c7;
    --accent2: #4f46e5;
    --up: #059669;
    --down: #e11d48;
    --warn: #b45309;
    --border: rgba(15, 23, 42, 0.09);
    --border-strong: rgba(15, 23, 42, 0.2);
    --shadow: 0 20px 60px rgba(15, 23, 42, 0.1);
    --glow: 0 0 0 1px rgba(2, 132, 199, 0.35), 0 12px 40px rgba(2, 132, 199, 0.14);
    --nav-bg: rgba(248, 250, 252, 0.78);
    --out-bg: rgba(2, 132, 199, 0.07);
    --dot-ring: rgba(5, 150, 105, 0.22);
    --badge-ready-bg: rgba(5, 150, 105, 0.13);
    --badge-soon-bg: rgba(100, 116, 139, 0.14);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
body {
  font-family: "IBM Plex Sans Thai", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- แสงออโรร่าเป็นพื้นหลัง ---------- */
.aurora { position: fixed; inset: 0; z-index: -1; overflow: hidden; background: linear-gradient(165deg, var(--bg), var(--bg2)); }
.aurora span { position: absolute; display: block; border-radius: 50%; filter: blur(90px); opacity: 0.42; }
.aurora span:nth-child(1) { width: 44vw; height: 44vw; top: -14vw; left: -8vw; background: #38bdf8; }
.aurora span:nth-child(2) { width: 34vw; height: 34vw; top: 26vw; right: -12vw; background: #818cf8; }
@media (prefers-color-scheme: light) { .aurora span { opacity: 0.24; } }

.wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 20px; }
.wrap-wide { max-width: 1080px; }

/* ---------- แถบบน ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  background: var(--nav-bg); border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.02rem; color: var(--text); text-decoration: none; }
.brand .mark { width: 30px; height: 30px; display: grid; place-items: center; font-size: 1rem; border-radius: 9px; background: linear-gradient(135deg, var(--accent), var(--accent2)); }
.nav a.back { font-size: 0.85rem; font-weight: 600; color: var(--muted); text-decoration: none; }
.nav a.back:hover { color: var(--accent); }

/* ---------- หัวเรื่องหน้าเครื่องมือ ---------- */
main { padding: 40px 0 70px; }
h1 { font-size: clamp(1.6rem, 4.6vw, 2.25rem); font-weight: 700; letter-spacing: -0.4px; line-height: 1.3; }
.sub { color: var(--muted); font-size: 0.97rem; margin: 10px 0 30px; }

/* ---------- กล่องเครื่องมือ ---------- */
.tool-card {
  background: var(--card);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border: 1px solid var(--border); border-radius: 22px; padding: 24px 22px;
}
.tool-card + .tool-card { margin-top: 16px; }

label.lbl { display: block; font-size: 0.82rem; font-weight: 600; color: var(--muted); margin-bottom: 8px; }
.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 520px) { .grid2 { grid-template-columns: 1fr; } }

input[type="text"], input[type="number"], input[type="date"], input[type="search"], select, textarea {
  width: 100%; font-family: inherit; font-size: 1rem; color: var(--text);
  background: var(--card-solid); border: 1px solid var(--border-strong);
  border-radius: 13px; padding: 13px 15px;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: transparent; box-shadow: var(--glow); }
textarea { resize: vertical; min-height: 150px; line-height: 1.7; }
input.num { text-align: right; font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: var(--accent); padding: 0; background: transparent; border: none; }

.btn {
  font-family: inherit; font-size: 0.92rem; font-weight: 600;
  border-radius: 13px; padding: 12px 18px; cursor: pointer;
  border: 1px solid var(--border); background: transparent; color: var(--text);
  transition: background 0.15s, border-color 0.15s, color 0.15s, filter 0.15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; border-color: transparent; }
.btn.primary:hover { filter: brightness(1.08); color: #fff; }
.btn.done { border-color: var(--up); color: var(--up); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-row .btn { flex: 1; min-width: 120px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips button {
  font-family: inherit; font-size: 0.8rem; font-weight: 600; color: var(--muted);
  background: transparent; border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 13px; cursor: pointer; transition: color 0.15s, border-color 0.15s;
}
.chips button:hover { color: var(--accent); border-color: var(--accent); }
.chips button[aria-pressed="true"] { color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent2)); border-color: transparent; }

/* ---------- กล่องผลลัพธ์ ---------- */
.out {
  background: var(--out-bg); border: 1px solid var(--border-strong); border-radius: 16px;
  padding: 20px 18px; margin-top: 6px;
}
.out.center { display: flex; align-items: center; justify-content: center; text-align: center; min-height: 92px; }
.result-big { font-size: clamp(1.5rem, 6vw, 2.1rem); font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.5px; }
.result-lbl { font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.rows { display: flex; flex-direction: column; gap: 2px; }
.row-item { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; padding: 9px 0; border-bottom: 1px solid var(--border); }
.row-item:last-child { border-bottom: none; }
.row-item .k { font-size: 0.88rem; color: var(--muted); }
.row-item .v { font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.row-item.total .k { color: var(--text); font-weight: 600; }
.row-item.total .v { font-size: 1.2rem; color: var(--accent); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; }
.stat {
  background: var(--card-solid); border: 1px solid var(--border); border-radius: 15px;
  padding: 16px 14px; text-align: center;
}
.stat .n { font-size: clamp(1.3rem, 4.5vw, 1.7rem); font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1.2; }
.stat .l { font-size: 0.76rem; color: var(--muted); margin-top: 3px; }

.note { font-size: 0.8rem; color: var(--muted); margin-top: 14px; text-align: center; }
.warn-box { border: 1px solid var(--warn); border-radius: 14px; padding: 14px 16px; margin-top: 14px; font-size: 0.86rem; color: var(--muted); }
.warn-box strong { color: var(--warn); }

/* ---------- เนื้อหาอธิบาย (สำคัญต่อ SEO) ---------- */
article { margin-top: 54px; }
article h2 { font-size: 1.25rem; font-weight: 600; margin: 38px 0 12px; letter-spacing: -0.2px; }
article h3 { font-size: 1rem; font-weight: 600; margin: 24px 0 7px; }
article p, article li { color: var(--muted); font-size: 0.95rem; }
article p { margin-bottom: 13px; }
article ul, article ol { margin: 0 0 14px 22px; }
article li { margin-bottom: 7px; }
article strong { color: var(--text); font-weight: 600; }
article a { color: var(--accent); }

.table-scroll { overflow-x: auto; margin: 14px 0 18px; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; min-width: 420px; font-size: 0.9rem; }
th, td { text-align: left; padding: 10px 13px; border-bottom: 1px solid var(--border); }
th { color: var(--text); font-weight: 600; font-size: 0.85rem; white-space: nowrap; }
td { color: var(--muted); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

.callout { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 18px 20px; margin: 20px 0; }
.callout p:last-child { margin-bottom: 0; }

/* ---------- ท้ายหน้า ---------- */
footer { border-top: 1px solid var(--border); padding: 28px 0 44px; font-size: 0.85rem; color: var(--muted); }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--accent); text-decoration: underline; }
.foot-links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 10px; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}