/* =========================================================
   Digi Era — Theme Stylesheet
   Brand system: Digi Blue / Signal Cyan / Graphite / Off-White
   Display font: Space Grotesk · Body: Inter · Thai: IBM Plex Sans Thai
   ========================================================= */

:root {
	--color-primary: #1E3FA8;
	--color-primary-dark: #16307F;
	--color-primary-light: #E8ECFB;
	--color-accent: #00C2FF;
	--color-graphite: #0F172A;
	--color-white: #FFFFFF;
	--color-muted: #64748B;
	--color-border: #E2E8F0;
	--color-success: #16A34A;
	--color-danger: #DC2626;

	--font-display: 'Space Grotesk', 'IBM Plex Sans Thai', sans-serif;
	--font-body: 'Inter', 'IBM Plex Sans Thai', sans-serif;

	--radius-sm: 8px;
	--radius-md: 14px;
	--radius-lg: 24px;
	--shadow-card: 0 4px 24px rgba(15, 23, 42, 0.08);
	--shadow-card-hover: 0 12px 32px rgba(15, 23, 42, 0.14);
	--container-width: 1160px;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
	margin: 0;
	font-family: var(--font-body);
	color: var(--color-graphite);
	background: var(--color-white);
	line-height: 1.65;
	font-size: 16px;
	-webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--color-accent); }
h1, h2, h3, h4, h5, h6 {
	font-family: var(--font-display);
	color: var(--color-graphite);
	line-height: 1.25;
	margin: 0 0 .6em;
	font-weight: 600;
}
h1 { font-size: clamp(2rem, 1.4rem + 2.4vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 1.3rem + 1.4vw, 2.4rem); }
h3 { font-size: clamp(1.25rem, 1.1rem + .7vw, 1.6rem); }
p { margin: 0 0 1.1em; }
ul, ol { padding-left: 1.25em; }
.container {
	max-width: var(--container-width);
	margin: 0 auto;
	padding: 0 24px;
}
@media (max-width: 780px) { section { padding: 48px 0; } }

.screen-reader-text {
	position: absolute !important;
	clip: rect(1px, 1px, 1px, 1px);
	overflow: hidden;
	height: 1px; width: 1px;
	word-wrap: normal !important;
}
.skip-link:focus {
	position: fixed; top: 8px; left: 8px; z-index: 9999;
	background: var(--color-graphite); color: #fff;
	padding: 12px 18px; border-radius: var(--radius-sm);
	clip: auto; width: auto; height: auto;
}

/* ---------- Buttons ---------- */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	font-family: var(--font-display);
	font-weight: 600;
	font-size: .95rem;
	padding: 13px 26px;
	border-radius: 999px;
	border: 2px solid transparent;
	cursor: pointer;
	white-space: nowrap;
	transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
}
.btn-primary {
	background: var(--color-primary);
	color: #fff;
	box-shadow: 0 8px 20px rgba(30, 63, 168, .28);
}
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; transform: translateY(-2px); }
.btn-accent { background: var(--color-accent); color: var(--color-graphite); }
.btn-accent:hover { background: #00a8e0; color: var(--color-graphite); transform: translateY(-2px); }
.btn-ghost {
	background: transparent;
	color: var(--color-graphite);
	border-color: var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-ghost-light { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost-light:hover { border-color: #fff; color: #fff; background: rgba(255,255,255,.08); }
.btn-lg { padding: 16px 34px; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 500;
	background: rgba(255,255,255,.92);
	backdrop-filter: blur(10px);
	border-bottom: 1px solid var(--color-border);
}
.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 24px;
	min-height: 78px;
}
.site-logo img { height: 34px; width: auto; }

.nav-toggle {
	display: none;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 40px; height: 40px;
	background: none;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	cursor: pointer;
}
.nav-toggle-bar { width: 20px; height: 2px; background: var(--color-graphite); margin: 0 auto; transition: transform .2s ease, opacity .2s ease; }
.nav-toggle.is-active .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.is-active .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.primary-navigation { display: flex; align-items: center; gap: 28px; flex: 1; justify-content: flex-end; }
.nav-menu { display: flex; align-items: center; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-menu > li { position: relative; }
.nav-menu > li > a {
	color: var(--color-graphite);
	font-weight: 500;
	font-size: .96rem;
	padding: 8px 0;
}
.nav-menu > li.menu-item-has-children > a::after { content: '▾'; font-size: .7em; margin-left: 5px; opacity: .6; }
.nav-menu .sub-menu {
	list-style: none;
	margin: 0; padding: 10px;
	position: absolute;
	top: 100%; left: 0;
	background: #fff;
	min-width: 240px;
	border-radius: var(--radius-md);
	box-shadow: var(--shadow-card-hover);
	opacity: 0;
	visibility: hidden;
	transform: translateY(6px);
	transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
}
.nav-menu > li:hover > .sub-menu,
.nav-menu > li.sub-open > .sub-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-menu .sub-menu li a { display: block; padding: 10px 12px; border-radius: var(--radius-sm); color: var(--color-graphite); font-size: .92rem; }
.nav-menu .sub-menu li a:hover { background: var(--color-primary-light); color: var(--color-primary); }

.header-ctas { display: flex; gap: 10px; }
.header-ctas .btn { padding: 10px 18px; font-size: .88rem; }

@media (max-width: 900px) {
	.nav-toggle { display: flex; }
	.primary-navigation {
		position: fixed; inset: 78px 0 0 0;
		background: #fff;
		flex-direction: column;
		align-items: stretch;
		padding: 24px;
		transform: translateX(100%);
		transition: transform .25s ease;
		overflow-y: auto;
		justify-content: flex-start;
	}
	.primary-navigation.is-open { transform: translateX(0); }
	.nav-menu { flex-direction: column; align-items: stretch; gap: 0; }
	.nav-menu > li { border-bottom: 1px solid var(--color-border); }
	.nav-menu > li > a { display: block; padding: 14px 4px; }
	.nav-menu .sub-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; display: none; padding-left: 12px; }
	.menu-item-has-children.sub-open .sub-menu { display: block; }
	.header-ctas { flex-direction: column; margin-top: 20px; }
	body.nav-open { overflow: hidden; }
}

/* ---------- Hero ---------- */
.hero {
	background: linear-gradient(160deg, var(--color-graphite) 0%, var(--color-primary-dark) 100%);
	color: #fff;
	padding: 90px 0 60px;
	position: relative;
	overflow: hidden;
}
.hero::after {
	content: '';
	position: absolute;
	inset: auto -20% -40% auto;
	width: 60%; height: 140%;
	background: radial-gradient(circle, rgba(0,194,255,.28) 0%, rgba(0,194,255,0) 65%);
	pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 780px; }
.hero-eyebrow {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-family: var(--font-display);
	font-size: .82rem;
	letter-spacing: .04em;
	color: var(--color-accent);
	background: rgba(0,194,255,.12);
	border: 1px solid rgba(0,194,255,.35);
	padding: 6px 16px;
	border-radius: 999px;
	margin-bottom: 20px;
}
.hero h1 { color: #fff; }
.hero h1 .accent { color: var(--color-accent); }
.hero-subtitle { color: rgba(255,255,255,.82); font-size: 1.08rem; max-width: 640px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-wide .hero-inner { max-width: 900px; }

/* Stat bar */
.stat-bar {
	position: relative;
	z-index: 1;
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 1px;
	background: rgba(255,255,255,.12);
	border-radius: var(--radius-lg);
	overflow: hidden;
	margin-top: 48px;
}
.stat-box {
	background: rgba(255,255,255,.05);
	padding: 24px 18px;
	text-align: center;
}
.stat-value { display: block; font-family: var(--font-display); font-size: 1.9rem; font-weight: 700; color: #fff; }
.stat-label { display: block; font-size: .82rem; color: rgba(255,255,255,.72); margin-top: 4px; }
@media (max-width: 700px) {
	.stat-bar { grid-template-columns: repeat(2, 1fr); }
}
/* Light-background variant (used on pages/cards outside the hero) */
.stat-bar.is-light { background: var(--color-border); }
.stat-bar.is-light .stat-box { background: var(--color-offwhite); }
.stat-bar.is-light .stat-value { color: var(--color-primary); }
.stat-bar.is-light .stat-label { color: var(--color-muted); }

/* ---------- Section headings ---------- */
.section-head { max-width: 700px; margin: 0 auto 48px; text-align: center; }
.section-head.align-left { margin-left: 0; text-align: left; }
.eyebrow {
	display: inline-block;
	font-family: var(--font-display);
	font-size: .82rem;
	letter-spacing: .04em;
	color: var(--color-primary);
	background: var(--color-primary-light);
	padding: 5px 14px;
	border-radius: 999px;
	margin-bottom: 14px;
}
.section-head p { color: var(--color-muted); }
.bg-graphite { background: var(--color-graphite); color: #fff; }
.bg-graphite h2, .bg-graphite h3 { color: #fff; }
.bg-graphite .section-head p { color: rgba(255,255,255,.7); }
.bg-offwhite { background: var(--color-offwhite); }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
	background: #fff;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	padding: 28px;
	box-shadow: var(--shadow-card);
	transition: box-shadow .2s ease, transform .2s ease;
	height: 100%;
}
.card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-3px); }
.card-icon {
	width: 48px; height: 48px;
	border-radius: var(--radius-sm);
	background: var(--color-primary-light);
	color: var(--color-primary);
	display: flex; align-items: center; justify-content: center;
	font-family: var(--font-display); font-weight: 700;
	margin-bottom: 16px;
}

/* Post / archive teaser cards (blog, service, case study, course) */
.post-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.post-card-media { aspect-ratio: 16/10; overflow: hidden; background: var(--color-primary-light); }
.post-card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.post-card:hover .post-card-media img { transform: scale(1.05); }
.post-card-body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.post-card-meta { font-size: .82rem; color: var(--color-muted); margin-bottom: 10px; display: flex; gap: 10px; flex-wrap: wrap; }
.post-card-meta a { color: var(--color-primary); }
.post-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.post-card h3 a { color: var(--color-graphite); }
.post-card h3 a:hover { color: var(--color-primary); }
.post-card p { color: var(--color-muted); font-size: .94rem; flex: 1; }
.post-card .read-more { font-family: var(--font-display); font-weight: 600; font-size: .88rem; margin-top: auto; }

/* ---------- Numbered step / approach list ---------- */
.step-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.step-item { display: flex; gap: 20px; align-items: flex-start; }
.step-num {
	flex: none;
	width: 44px; height: 44px;
	border-radius: 50%;
	background: var(--color-primary);
	color: #fff;
	font-family: var(--font-display); font-weight: 700;
	display: flex; align-items: center; justify-content: center;
}
.step-item h4 { margin-bottom: 4px; }
.step-item p { color: var(--color-muted); margin-bottom: 0; }

/* Checklist */
.check-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; }
.check-list li::before {
	content: '✓';
	flex: none;
	width: 24px; height: 24px;
	border-radius: 50%;
	background: var(--color-primary-light);
	color: var(--color-primary);
	font-size: .78rem; font-weight: 700;
	display: flex; align-items: center; justify-content: center;
}

/* ---------- Accordion (course / FAQ) ---------- */
.accordion { border-top: 1px solid var(--color-border); }
.accordion-item { border-bottom: 1px solid var(--color-border); }
.accordion-trigger {
	width: 100%;
	background: none; border: none;
	display: flex; align-items: center; justify-content: space-between;
	padding: 20px 4px;
	font-family: var(--font-display); font-weight: 600; font-size: 1.02rem;
	color: var(--color-graphite);
	cursor: pointer; text-align: left;
}
.accordion-trigger::after { content: '+'; font-size: 1.4rem; color: var(--color-primary); transition: transform .2s ease; }
.accordion-item.is-open .accordion-trigger::after { transform: rotate(45deg); }
.accordion-panel { max-height: 0; overflow: hidden; transition: max-height .25s ease; color: var(--color-muted); }
.accordion-item.is-open .accordion-panel { max-height: 600px; padding-bottom: 20px; }

/* ---------- CTA band ---------- */
.cta-band {
	background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
	color: #fff;
	border-radius: var(--radius-lg);
	padding: 56px;
	text-align: center;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,.85); max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-band .hero-ctas { justify-content: center; }
@media (max-width: 700px) { .cta-band { padding: 36px 22px; } }

/* Logo strip (media partners / trusted brands) */
.logo-strip { display: flex; flex-wrap: wrap; gap: 28px 40px; align-items: center; justify-content: center; }
.logo-strip span {
	font-family: var(--font-display);
	font-weight: 600;
	color: var(--color-muted);
	padding: 8px 18px;
	border: 1px solid var(--color-border);
	border-radius: 999px;
	font-size: .88rem;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: .86rem; color: var(--color-muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .current { color: var(--color-graphite); font-weight: 500; }
.breadcrumb .sep { margin: 0 4px; }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: .88rem; font-weight: 500; color: var(--color-graphite); }
.form-field input,
.form-field select,
.form-field textarea {
	font-family: var(--font-body);
	font-size: .96rem;
	padding: 13px 16px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	background: #fff;
	color: var(--color-graphite);
	width: 100%;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
	outline: none;
	border-color: var(--color-primary);
	box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-field input.field-error { border-color: var(--color-danger); }
.form-honeypot { position: absolute; left: -9999px; opacity: 0; width: 1px; height: 1px; }
.form-notice { padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 22px; font-size: .94rem; }
.form-notice.success { background: #EAF7EE; color: var(--color-success); border: 1px solid #BBEBC7; }
.form-notice.error { background: #FDEDEC; color: var(--color-danger); border: 1px solid #F7C9C6; }

.contact-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: start; }
@media (max-width: 900px) { .contact-layout { grid-template-columns: 1fr; } }
.contact-form-card {
	background: #fff;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	padding: 36px;
	box-shadow: var(--shadow-card);
}

/* ---------- Blog / single post ---------- */
.entry-header { max-width: 780px; margin: 0 auto 32px; text-align: center; }
.entry-thumbnail { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 40px; }
.entry-content { max-width: 760px; margin: 0 auto; }
.entry-content h2 { margin-top: 1.6em; }
.entry-content h3 { margin-top: 1.4em; }
.entry-content ul, .entry-content ol { margin-bottom: 1.2em; }
.entry-content img { border-radius: var(--radius-md); margin: 1.5em 0; }
.entry-content blockquote {
	border-left: 4px solid var(--color-accent);
	margin: 1.5em 0;
	padding: 4px 24px;
	color: var(--color-muted);
	font-style: italic;
}
.entry-meta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; color: var(--color-muted); font-size: .9rem; margin-bottom: 10px; }
.entry-meta a { color: var(--color-primary); }
.entry-toc {
	background: var(--color-offwhite);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	padding: 22px 26px;
	margin: 0 auto 40px;
	max-width: 760px;
}
.entry-toc summary { font-family: var(--font-display); font-weight: 600; cursor: pointer; }
.entry-toc ol { margin: 14px 0 0; }
.entry-toc a { color: var(--color-graphite); }
.entry-toc a:hover { color: var(--color-primary); }

.blog-list { display: grid; gap: 28px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 960px) { .blog-list { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .blog-list { grid-template-columns: 1fr; } }

/* Pagination */
.pagination ul { display: flex; gap: 8px; list-style: none; padding: 0; margin: 40px 0 0; justify-content: center; flex-wrap: wrap; }
.pagination .page-numbers {
	display: inline-flex; align-items: center; justify-content: center;
	min-width: 40px; height: 40px; padding: 0 12px;
	border-radius: var(--radius-sm);
	border: 1px solid var(--color-border);
	color: var(--color-graphite);
	font-family: var(--font-display); font-size: .9rem;
}
.pagination .page-numbers.current { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.pagination .page-numbers:hover:not(.current) { border-color: var(--color-primary); color: var(--color-primary); }

/* Sidebar */
.with-sidebar { display: grid; grid-template-columns: 2fr 1fr; gap: 48px; }
@media (max-width: 900px) { .with-sidebar { grid-template-columns: 1fr; } }
.widget { margin-bottom: 32px; }
.widget-title { font-size: 1.05rem; margin-bottom: 14px; }

/* ---------- Case study specifics ---------- */
.case-meta-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.case-meta-list li { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid var(--color-border); font-size: .92rem; }
.case-meta-list li span:first-child { color: var(--color-muted); }
.case-meta-list li span:last-child { font-weight: 600; text-align: right; }
.tag-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li { background: var(--color-primary-light); color: var(--color-primary); font-size: .82rem; padding: 6px 14px; border-radius: 999px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--color-graphite); color: rgba(255,255,255,.8); padding-top: 64px; }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 48px; }
@media (max-width: 860px) { .footer-inner { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .footer-inner { grid-template-columns: 1fr; } }
.footer-brand p { color: rgba(255,255,255,.65); font-size: .92rem; margin-top: 16px; }
.footer-social { display: flex; gap: 10px; margin-top: 18px; }
.footer-social a {
	width: 38px; height: 38px;
	border-radius: 50%;
	border: 1px solid rgba(255,255,255,.25);
	color: #fff;
	display: flex; align-items: center; justify-content: center;
	font-size: .72rem; font-family: var(--font-display); font-weight: 700;
}
.footer-social a:hover { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-graphite); }
.footer-col .widget-title { color: #fff; font-size: .98rem; }
.footer-menu, .footer-contact { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-menu a, .footer-contact a, .footer-contact li { color: rgba(255,255,255,.72); font-size: .92rem; }
.footer-menu a:hover { color: var(--color-accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0; }
.footer-bottom p { margin: 0; font-size: .84rem; color: rgba(255,255,255,.55); text-align: center; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.color-muted { color: var(--color-muted); }
.color-accent { color: var(--color-accent); }
.no-results { text-align: center; padding: 80px 0; color: var(--color-muted); }