/* =========================================================================
 * style.css — ASME VIII-2 formula toolbox
 * ========================================================================= */
:root {
  --navy: #1f3a5f;
  --navy-dark: #16293f;
  --accent: #2e6fb7;
  --bg: #f2f5f9;
  --card: #ffffff;
  --text: #1d2733;
  --muted: #5b6b7c;
  --ok: #17804b;
  --ok-bg: #e3f5ec;
  --bad: #b3352c;
  --bad-bg: #fbe9e7;
  --warn-bg: #fff7e0;
  --warn-border: #e3b341;
  --border: #d7dee8;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans", "Malgun Gothic", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
.mono { font-family: Consolas, "Courier New", monospace; }

/* ---------- top bar ---------- */
.topbar { background: var(--navy); color: #fff; }
.topbar-inner {
  max-width: 1100px; margin: 0 auto; padding: 14px 20px 10px;
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: space-between;
}
.brand { display: flex; gap: 12px; align-items: center; min-width: 260px; flex: 1; }
.brand-mark {
  background: #fff; color: var(--navy); font-weight: 800; font-size: 1.05rem;
  border-radius: 8px; padding: 9px 11px; letter-spacing: .5px;
}
.brand h1 { font-size: 1.15rem; margin: 0; }
.subtitle { margin: 2px 0 0; font-size: .78rem; opacity: .85; max-width: 560px; }
.controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.control { display: flex; align-items: center; gap: 8px; font-size: .85rem; }
.control span { opacity: .85; }
select {
  font: inherit; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--border);
  background: #fff; color: var(--text); cursor: pointer;
}
.unit-toggle { display: flex; border: 1px solid rgba(255,255,255,.4); border-radius: 8px; overflow: hidden; }
.unit-btn {
  font: inherit; font-size: .8rem; padding: 7px 12px; border: 0; cursor: pointer;
  background: transparent; color: #fff; opacity: .75;
}
.unit-btn.active { background: #fff; color: var(--navy); opacity: 1; font-weight: 600; }
.disclaimer-banner {
  background: var(--navy-dark); font-size: .72rem; padding: 6px 20px;
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap; justify-content: center; opacity: .95;
}
.linklike {
  background: none; border: 0; color: #ffd980; cursor: pointer; font: inherit;
  text-decoration: underline; padding: 0;
}

/* ---------- tabs ---------- */
.tabs {
  max-width: 1100px; margin: 14px auto 0; padding: 0 20px;
  display: flex; gap: 8px; overflow-x: auto; scrollbar-width: thin;
}
.tabs button {
  font: inherit; font-size: .88rem; white-space: nowrap; cursor: pointer;
  border: 1px solid var(--border); background: #fff; color: var(--text);
  padding: 9px 16px; border-radius: 999px;
}
.tabs button.active { background: var(--navy); border-color: var(--navy); color: #fff; font-weight: 600; }

/* ---------- panels ---------- */
main { max-width: 1100px; margin: 0 auto; padding: 14px 20px 40px; }
.panel {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px 26px; margin-top: 14px; box-shadow: 0 1px 3px rgba(31,58,95,.06);
}
.panel[hidden] { display: none; }
.panel h2 { margin: 0 0 12px; font-size: 1.25rem; color: var(--navy); }
.panel-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.clause { font-size: .78rem; color: var(--muted); background: var(--bg); padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border); }
.tool-note { font-size: .8rem; color: var(--muted); margin: 10px 0; }

.formula-box {
  font-family: Consolas, "Courier New", monospace; font-size: .88rem;
  background: #eef3fa; border-left: 4px solid var(--accent);
  padding: 10px 14px; border-radius: 6px; margin: 12px 0 16px;
  white-space: pre-wrap; word-break: break-word; color: #22344c;
}

/* ---------- forms ---------- */
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin-bottom: 6px; }
.grid3 label { display: flex; flex-direction: column; gap: 5px; font-size: .85rem; }
.fields {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(225px, 1fr));
  gap: 12px; margin: 8px 0 4px;
}
.field { display: flex; flex-direction: column; gap: 5px; font-size: .84rem; }
.field > span { color: var(--muted); display: flex; gap: 5px; align-items: baseline; flex-wrap: wrap; }
.field .u { color: var(--accent); font-size: .75rem; }
.field .hint { color: #9aa8b6; font-style: normal; font-size: .72rem; }
.field input[type="number"], .grid3 input[type="number"] {
  font: inherit; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px;
  background: #fff; width: 100%;
}
.field input:focus, select:focus { outline: 2px solid rgba(46,111,183,.35); border-color: var(--accent); }
.field.dim { opacity: .45; }
.field.wide { grid-column: 1 / -1; }
.radio-row { display: flex; gap: 16px; flex-wrap: wrap; }
.radio { display: inline-flex; gap: 6px; align-items: center; font-size: .85rem; cursor: pointer; }
.radio input { accent-color: var(--accent); width: 16px; height: 16px; }

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0 4px; }
.actions button {
  font: inherit; font-size: .9rem; padding: 9px 18px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--navy); background: #fff; color: var(--navy);
}
.actions button:hover { background: #eef3fa; }
.actions button.primary { background: var(--navy); color: #fff; font-weight: 600; }
.actions button.primary:hover { background: var(--accent); border-color: var(--accent); }
.copy-btn { border-style: dashed !important; }

/* ---------- results ---------- */
.results { margin-top: 14px; }
.results h3 { font-size: .95rem; color: var(--navy); margin: 18px 0 8px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.result-card {
  display: inline-block; vertical-align: top; background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 18px; margin: 0 10px 10px 0; min-width: 180px;
}
.result-card.main { background: #eef6ee; border-color: #bfe0c8; }
.result-card.ok .rc-value { color: var(--ok); }
.result-card.bad { background: var(--bad-bg); border-color: #e6b1aa; }
.result-card.bad .rc-value { color: var(--bad); }
.result-card.warn { background: var(--warn-bg); border-color: var(--warn-border); color: #6b5410; max-width: 560px; font-size: .9rem; }
.result-card.bad-card { background: var(--bad-bg); border-color: #e6b1aa; color: var(--bad); display: block; }
.rc-label { font-size: .74rem; color: var(--muted); margin-bottom: 4px; }
.result-card.main .rc-label { color: #3c5a36; }
.result-card.bad .rc-label { color: #7c2d26; }
.rc-value { font-size: 1.45rem; font-weight: 700; color: var(--navy); }
.rc-u { font-size: .85rem; font-weight: 400; color: var(--muted); }

.tbl { width: 100%; border-collapse: collapse; font-size: .84rem; }
.tbl th, .tbl td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.tbl th { background: var(--bg); color: var(--muted); font-weight: 600; }
.tbl td.mono { font-family: Consolas, "Courier New", monospace; font-size: .82rem; }
.badge { font-size: .72rem; font-weight: 700; padding: 2px 10px; border-radius: 999px; }
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.bad { background: var(--bad-bg); color: var(--bad); }

/* ---------- home ---------- */
#panel-home h2 { margin-top: 4px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; margin: 16px 0; }
.card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.card h3 { margin: 0 0 6px; font-size: .95rem; color: var(--navy); }
.card p { margin: 0; font-size: .82rem; color: var(--muted); }
.how { font-size: .82rem; color: #6b5410; background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 8px; padding: 10px 14px; }
.sep { border: 0; border-top: 1px dashed var(--border); margin: 26px 0 18px; }
.reminder-pre { font: inherit; font-size: .8rem; white-space: pre-wrap; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; color: var(--text); }

/* ---------- dialog ---------- */
dialog {
  border: 1px solid var(--border); border-radius: 12px; max-width: 640px; width: calc(100% - 40px);
  padding: 22px 26px; box-shadow: 0 12px 40px rgba(0,0,0,.25);
}
dialog::backdrop { background: rgba(15,30,50,.55); }
dialog h3 { margin-top: 0; color: var(--navy); }
dialog .small { font-size: .78rem; color: var(--muted); }

/* ---------- footer ---------- */
.foot { max-width: 1100px; margin: 0 auto; padding: 10px 20px 30px; }
.foot p { font-size: .72rem; color: var(--muted); text-align: center; }

@media (max-width: 640px) {
  .topbar-inner { padding: 12px 14px 8px; }
  .panel { padding: 16px 14px 20px; }
  .rc-value { font-size: 1.2rem; }
}