/* dfsp.sg — Design for Safety Professional Consultancy
Professional engineering visual system. System fonts only (no external font
requests) to keep Core Web Vitals fast and avoid layout shift. */

:root {
--navy: #0a1a2f;
--navy-2: #0f2647;
--blue: #1f6fd6;
--blue-dark: #14549f;
--blue-tint: #eaf2fc;
--blue-tint-2: #dce9fb;
--ink: #10192b;
--gray-900: #1a2333;
--gray-700: #435062;
--gray-500: #6b7688;
--gray-300: #d6dce6;
--gray-100: #f4f6fa;
--white: #ffffff;
--amber: #b6790a;
--amber-tint: #fdf3df;
--green: #1d7a4c;
--radius: 10px;
--max: 1180px;
--shadow: 0 1px 2px rgba(10,26,47,.06), 0 8px 24px rgba(10,26,47,.06);
--serif: Georgia, "Times New Roman", serif;
--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
html { scroll-behavior: auto; }
* { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
margin: 0;
font-family: var(--sans);
color: var(--ink);
background: var(--white);
line-height: 1.6;
-webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
outline: 3px solid var(--amber); outline-offset: 2px;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

h1, h2, h3, h4 { font-family: var(--sans); font-weight: 800; line-height: 1.2; color: var(--navy); margin: 0 0 .5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); }
h2 { font-size: clamp(1.4rem, 2.3vw, 1.85rem); margin-top: 2.2em; }
h3 { font-size: 1.2rem; margin-top: 1.6em; }
p { margin: 0 0 1em; color: var(--gray-700); }
ul, ol { color: var(--gray-700); padding-left: 1.3em; }
li { margin-bottom: .45em; }
strong { color: var(--ink); }
.lede { font-size: 1.15rem; color: var(--gray-700); }

/* Skip link */
.skip-link { position: absolute; left: -999px; top: auto; background: var(--navy); color: #fff; padding: 10px 16px; z-index: 1000; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; top: 0; }

/* Header */
header.site {
border-bottom: 1px solid var(--gray-300);
position: sticky; top: 0; background: rgba(255,255,255,.97); backdrop-filter: saturate(180%) blur(6px);
z-index: 100;
}
.nav-row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; gap: 20px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { flex-shrink: 0; }
.brand-text { line-height: 1.15; }
.brand-text .name { font-weight: 800; font-size: 1.05rem; color: var(--navy); display: block; }
.brand-text .tag { font-size: .68rem; letter-spacing: .09em; color: var(--blue); font-weight: 700; text-transform: uppercase; }
.brand:hover { text-decoration: none; }

nav.primary { display: flex; align-items: center; gap: 26px; }
nav.primary a { color: var(--gray-900); font-weight: 600; font-size: .95rem; white-space: nowrap; }
nav.primary a:hover { color: var(--blue); text-decoration: none; }
nav.primary a[aria-current="page"] { color: var(--blue); }

.cta-btn, .btn {
display: inline-flex; align-items: center; justify-content: center; gap: 8px;
background: var(--blue); color: #fff; font-weight: 700; padding: 11px 20px;
border-radius: 8px; border: 2px solid var(--blue); font-size: .93rem; white-space: nowrap; cursor: pointer;
}
.cta-btn:hover, .btn:hover { background: var(--blue-dark); border-color: var(--blue-dark); text-decoration: none; }
.btn.outline { background: transparent; color: var(--navy); border: 2px solid var(--navy); }
.btn.outline:hover { background: var(--navy); color: #fff; }
.btn.outline-light { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.55); }
.btn.outline-light:hover { background: rgba(255,255,255,.12); }
.btn.small { padding: 8px 14px; font-size: .85rem; }

.menu-toggle { display: none; background: none; border: 2px solid var(--gray-300); border-radius: 8px; padding: 8px 10px; }
.menu-toggle svg { display: block; }

@media (max-width: 900px) {
nav.primary.desktop { display: none; }
.menu-toggle { display: inline-flex; }
.header-cta.desktop { display: none; }
}
#mobile-menu { display: none; border-top: 1px solid var(--gray-300); padding: 14px 0; }
#mobile-menu.open { display: block; }
#mobile-menu a { display: block; padding: 10px 4px; font-weight: 600; color: var(--gray-900); border-bottom: 1px solid var(--gray-100); }
#mobile-menu .btn { margin-top: 12px; width: 100%; }

/* Breadcrumbs */
.breadcrumbs { font-size: .82rem; color: var(--gray-500); padding: 14px 0 0; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; }
.breadcrumbs li { display: flex; align-items: center; gap: 6px; margin: 0; }
.breadcrumbs a { color: var(--gray-500); }
.breadcrumbs li[aria-current] { color: var(--gray-900); font-weight: 600; }

/* Hero */
.hero { background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%); color: #fff; padding: 56px 0 64px; }
.hero .kicker { display: inline-block; background: var(--blue); color: #fff; font-weight: 800; font-size: .74rem; letter-spacing: .07em; text-transform: uppercase; padding: 6px 12px; border-radius: 4px; margin-bottom: 18px; }
.hero h1 { color: #fff; max-width: 18ch; }
.hero .lede { color: #c9d6ea; max-width: 62ch; font-size: 1.12rem; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 26px; }
.hero-simple { background: var(--navy); color: #fff; padding: 40px 0 46px; }
.hero-simple h1 { color: #fff; }
.hero-simple .lede { color: #c9d6ea; max-width: 68ch; }

section { padding: 56px 0; }
section.tight { padding: 40px 0; }
section.alt { background: var(--gray-100); }
section.navy { background: var(--navy); color: #fff; }
section.navy h2 { color: #fff; }
section.navy p { color: #c9d6ea; }

.section-head { max-width: 74ch; margin-bottom: 34px; }
.section-head p { font-size: 1.05rem; }

/* Cards / grids */
.grid { display: grid; gap: 22px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 880px) { .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; } }

.card { background: #fff; border: 1px solid var(--gray-300); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.card h3 { margin-top: 0; }
.card .icon { width: 44px; height: 44px; border-radius: 9px; background: var(--blue-tint); display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
.card a.more { font-weight: 700; font-size: .92rem; }

.stat-row { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 22px; }
.stat { min-width: 150px; }
.stat .n { font-size: 1.9rem; font-weight: 800; color: var(--blue); display: block; }
.stat .l { font-size: .85rem; color: var(--gray-500); }

/* Boundary / callout boxes */
.callout { border-left: 4px solid var(--blue); background: var(--blue-tint); border-radius: 0 8px 8px 0; padding: 18px 22px; margin: 1.6em 0; }
.callout.warn { border-color: var(--amber); background: var(--amber-tint); }
.callout p:last-child { margin-bottom: 0; }
.callout strong.label { display: block; font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--blue-dark); margin-bottom: 6px; }
.callout.warn strong.label { color: #8a5b06; }

.brief-box { background: var(--navy); color: #fff; border-radius: var(--radius); padding: 24px 26px; margin: 1.6em 0; }
.brief-box strong.label { display: block; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: #8fb8ee; margin-bottom: 8px; }
.brief-box p { color: #dbe6f5; margin-bottom: 0; }

/* Two-column list (does/doesnt) */
.does-donts { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 1.4em 0; }
@media (max-width: 720px) { .does-donts { grid-template-columns: 1fr; } }
.does-donts .col { border-radius: var(--radius); padding: 20px 22px; }
.does-donts .yes { background: #eef8f1; border: 1px solid #bfe4cb; }
.does-donts .no { background: #fbeeee; border: 1px solid #f0c7c7; }
.does-donts h4 { margin-top: 0; font-size: .95rem; text-transform: uppercase; letter-spacing: .04em; }
.does-donts .yes h4 { color: var(--green); }
.does-donts .no h4 { color: #a3312f; }
.does-donts ul { padding-left: 1.1em; margin-bottom: 0; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.6em 0; }
table { width: 100%; border-collapse: collapse; font-size: .93rem; min-width: 560px; }
caption { text-align: left; font-weight: 700; color: var(--navy); margin-bottom: 10px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--gray-300); vertical-align: top; }
thead th { background: var(--navy); color: #fff; font-weight: 700; }
tbody tr:nth-child(even) { background: var(--gray-100); }

/* Process / timeline */
.timeline { display: flex; flex-wrap: wrap; gap: 14px; counter-reset: step; margin: 1.8em 0 0; }
.timeline .step { flex: 1 1 150px; background: #fff; border: 1px solid var(--gray-300); border-radius: var(--radius); padding: 18px; position: relative; }
.timeline .step .num { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 800; font-size: .9rem; margin-bottom: 10px; }
.timeline .step h4 { margin: 0 0 6px; font-size: .96rem; color: var(--navy); }
.timeline .step p { font-size: .86rem; margin: 0; color: var(--gray-500); }
.timeline .arrow { display: flex; align-items: center; color: var(--gray-300); font-size: 1.3rem; }
@media (max-width: 880px) { .timeline .arrow { display: none; } }

/* Accordion (FAQ) */
details.faq { background: #fff; border: 1px solid var(--gray-300); border-radius: 8px; padding: 4px 20px; margin-bottom: 12px; }
details.faq summary { cursor: pointer; font-weight: 700; padding: 14px 0; color: var(--navy); list-style: none; display: flex; justify-content: space-between; gap: 14px; align-items: center; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; font-size: 1.4rem; color: var(--blue); font-weight: 400; flex-shrink: 0; }
details.faq[open] summary::after { content: "\2212"; }
details.faq .a { padding: 0 0 16px; color: var(--gray-700); }

/* In brief box */
.in-brief { background: var(--blue-tint); border: 1px solid var(--blue-tint-2); border-radius: var(--radius); padding: 20px 24px; margin: 0 0 2em; }
.in-brief strong.label { display: block; font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; color: var(--blue-dark); margin-bottom: 8px; }
.in-brief p { margin-bottom: 0; color: var(--ink); font-size: 1.02rem; }

/* Article meta */
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 18px; font-size: .82rem; color: var(--gray-500); margin: 10px 0 28px; border-bottom: 1px solid var(--gray-300); padding-bottom: 20px; }
.article-meta span { display: inline-flex; align-items: center; gap: 6px; }
.tag-pill { display: inline-block; background: var(--gray-100); border: 1px solid var(--gray-300); color: var(--gray-700); font-size: .76rem; font-weight: 700; padding: 4px 10px; border-radius: 20px; text-transform: uppercase; letter-spacing: .03em; }
.tag-pill.reg { background: #fdf3df; border-color: #f0dba7; color: #8a5b06; }
.tag-pill.guide { background: var(--blue-tint); border-color: var(--blue-tint-2); color: var(--blue-dark); }
.tag-pill.practice { background: #eef8f1; border-color: #bfe4cb; color: var(--green); }

/* Resource index cards */
.res-list { display: grid; gap: 18px; margin-top: 30px; }
.res-card { display: flex; gap: 18px; background: #fff; border: 1px solid var(--gray-300); border-radius: var(--radius); padding: 20px 22px; align-items: flex-start; }
.res-card .idx { flex-shrink: 0; width: 40px; height: 40px; border-radius: 8px; background: var(--navy); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 800; }
.res-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.res-card p { margin: 0; font-size: .92rem; }

/* Article layout with TOC */
.article-layout { display: grid; grid-template-columns: 260px 1fr; gap: 44px; align-items: flex-start; }
@media (max-width: 980px) { .article-layout { grid-template-columns: 1fr; } .article-layout aside { display: none; } }
.toc { position: sticky; top: 90px; background: var(--gray-100); border-radius: var(--radius); padding: 18px 20px; font-size: .88rem; width: 100%; }
.toc strong { display: block; margin-bottom: 10px; color: var(--navy); font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; }
.toc ol { margin: 0; padding-left: 1.1em; }
.toc li { margin-bottom: 8px; }
.toc a { color: var(--gray-700); }

/* Boundary comparison rows */
.boundary-row { display: grid; grid-template-columns: 180px 1fr; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--gray-300); }
.boundary-row:last-child { border-bottom: none; }
.boundary-row .role { font-weight: 800; color: var(--navy); }
@media (max-width: 640px) { .boundary-row { grid-template-columns: 1fr; gap: 4px; } }

/* Reference list */
.ref-list { list-style: none; padding: 0; }
.ref-list li { padding: 10px 0; border-bottom: 1px solid var(--gray-300); font-size: .92rem; }
.ref-list li:last-child { border-bottom: none; }
.ref-list .src { display: inline-block; font-size: .72rem; font-weight: 700; text-transform: uppercase; color: var(--gray-500); margin-right: 8px; }

/* Contact / form */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: flex-start; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
form.enquiry { background: #fff; border: 1px solid var(--gray-300); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
form.enquiry .field { margin-bottom: 16px; }
form.enquiry label { display: block; font-weight: 700; font-size: .88rem; color: var(--navy); margin-bottom: 6px; }
form.enquiry .hint { font-weight: 400; color: var(--gray-500); font-size: .8rem; }
form.enquiry input[type=text], form.enquiry input[type=email], form.enquiry input[type=tel], form.enquiry select, form.enquiry textarea, form.enquiry input[type=file] {
width: 100%; padding: 11px 13px; border: 1px solid var(--gray-300); border-radius: 7px; font: inherit; color: var(--ink); background: #fff;
}
form.enquiry textarea { min-height: 110px; resize: vertical; }
form.enquiry fieldset { border: none; padding: 0; margin: 0 0 16px; }
form.enquiry .radio-row { display: flex; gap: 18px; flex-wrap: wrap; }
form.enquiry .radio-row label { display: flex; align-items: center; gap: 6px; font-weight: 500; color: var(--gray-700); }
form.enquiry .consent { font-size: .82rem; color: var(--gray-500); display: flex; gap: 8px; align-items: flex-start; }
.hp-field { position: absolute; left: -9999px; top: -9999px; }
#form-status { margin-top: 14px; font-weight: 600; }
#form-status.ok { color: var(--green); }
#form-status.err { color: #a3312f; }

.contact-info .item { display: flex; gap: 14px; margin-bottom: 22px; }
.contact-info .icon { flex-shrink: 0; width: 42px; height: 42px; border-radius: 9px; background: var(--blue-tint); display: flex; align-items: center; justify-content: center; }
.contact-info h4 { margin: 0 0 4px; font-size: .95rem; }
.contact-info p { margin: 0; font-size: .92rem; }

/* Diagram figure */
figure.diagram { margin: 1.8em 0; background: var(--gray-100); border: 1px solid var(--gray-300); border-radius: var(--radius); padding: 24px; }
figure.diagram figcaption { margin-top: 14px; font-size: .84rem; color: var(--gray-500); text-align: center; }

/* Final CTA band */
.cta-band { background: var(--blue); color: #fff; border-radius: var(--radius); padding: 40px; text-align: center; margin-top: 10px; }
.cta-band h2 { color: #fff; margin-top: 0; }
.cta-band p { color: #eaf2fc; }
.cta-band .actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.cta-band .btn { background: #fff; color: var(--blue); border-color: #fff; }
.cta-band .btn:hover { background: var(--navy); color: #fff; border-color: var(--navy); }
.cta-band .btn.outline-light:hover { background: rgba(255,255,255,.15); }

/* Sticky mobile enquiry bar */
.mobile-cta { display: none; }
@media (max-width: 720px) {
.mobile-cta { display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 90; background: #fff; border-top: 1px solid var(--gray-300); padding: 10px 14px; gap: 10px; box-shadow: 0 -4px 14px rgba(0,0,0,.08); }
.mobile-cta .btn { flex: 1; }
body { padding-bottom: 66px; }
}

/* Footer */
footer.site { background: var(--navy); color: #c9d6ea; padding: 52px 0 26px; margin-top: 40px; }
footer.site .grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
@media (max-width: 880px) { footer.site .grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { footer.site .grid { grid-template-columns: 1fr; } }
footer.site h4 { color: #fff; font-size: .82rem; text-transform: uppercase; letter-spacing: .06em; margin: 0 0 14px; }
footer.site a { color: #c9d6ea; }
footer.site a:hover { color: #fff; }
footer.site .fbrand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
footer.site .fbrand .name { color: #fff; font-weight: 800; }
footer.site ul { list-style: none; padding: 0; margin: 0; }
footer.site li { margin-bottom: 9px; font-size: .9rem; }
footer.site p.desc { font-size: .88rem; max-width: 40ch; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 34px; padding-top: 22px; display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; font-size: .8rem; color: #8fa2c2; }
.footer-bottom a { color: #8fa2c2; }

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

/* Floating WhatsApp contact button — injected by main.js on every page */
.wa-float {
position: fixed;
right: 20px;
bottom: 24px;
z-index: 120;
width: 58px;
height: 58px;
border-radius: 50%;
background: #25D366;
display: flex;
align-items: center;
justify-content: center;
box-shadow: 0 4px 14px rgba(10,26,47,.28), 0 2px 4px rgba(10,26,47,.18);
transition: transform .15s ease, box-shadow .15s ease;
}
.wa-float:hover { transform: scale(1.06); box-shadow: 0 6px 18px rgba(10,26,47,.34), 0 2px 6px rgba(10,26,47,.2); text-decoration: none; }
.wa-float:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }
@media (max-width: 720px) {
.wa-float { right: 16px; bottom: 82px; width: 52px; height: 52px; }
}

/* 404 */
.error-page { text-align: center; padding: 90px 0; }
.error-page .code { font-size: 5rem; font-weight: 800; color: var(--blue); margin: 0; }

/* Print */
@media print { header.site, footer.site, .mobile-cta, .breadcrumbs, .wa-float { display: none; } }