/* ==========================================================================
   Derry Training — main stylesheet
   Coursera-inspired: clean whites, deep blue accents, generous whitespace.
   ========================================================================== */

:root {
	--dt-blue: #0056d2;
	--dt-blue-dark: #00419e;
	--dt-blue-tint: #eaf1fd;
	--dt-navy: #0b1f3f;
	--dt-ink: #1f1f1f;
	--dt-gray: #5b6b81;
	--dt-line: #e3e8ef;
	--dt-bg-alt: #f5f7fa;
	--dt-gold: #f2b01e;
	--dt-radius: 12px;
	--dt-shadow: 0 2px 8px rgba(11, 31, 63, 0.08);
	--dt-shadow-lg: 0 12px 32px rgba(11, 31, 63, 0.14);
	--dt-font-body: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
	--dt-font-head: "Sora", var(--dt-font-body);
}

/* Reset / base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

body {
	margin: 0;
	font-family: var(--dt-font-body);
	font-size: 17px;
	line-height: 1.6;
	color: var(--dt-ink);
	background: #fff;
	-webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
	font-family: var(--dt-font-head);
	color: var(--dt-navy);
	line-height: 1.2;
	margin: 0 0 0.5em;
}

h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; font-weight: 700; }

p { margin: 0 0 1em; }
a { color: var(--dt-blue); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 1.2em; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 780px; }

.screen-reader-text {
	position: absolute !important;
	width: 1px; height: 1px;
	overflow: hidden;
	clip: rect(1px, 1px, 1px, 1px);
}

.skip-link {
	position: absolute;
	left: -9999px;
	background: var(--dt-navy);
	color: #fff;
	padding: 10px 18px;
	z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }

/* Buttons
   -------------------------------------------------------------------------- */
.btn {
	display: inline-block;
	font-family: var(--dt-font-body);
	font-weight: 700;
	font-size: 1rem;
	padding: 12px 26px;
	border-radius: 8px;
	border: 2px solid transparent;
	cursor: pointer;
	text-align: center;
	transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn--primary { background: var(--dt-blue); color: #fff; }
.btn--primary:hover { background: var(--dt-blue-dark); color: #fff; }

.btn--ghost { background: transparent; color: var(--dt-blue); border-color: var(--dt-blue); }
.btn--ghost:hover { background: var(--dt-blue-tint); }

.btn--light { background: #fff; color: var(--dt-blue); }
.btn--light:hover { background: var(--dt-blue-tint); }

.btn--lg { padding: 15px 34px; font-size: 1.06rem; }
.btn--sm { padding: 7px 16px; font-size: 0.9rem; }
.btn--block { display: block; width: 100%; }

/* Top bar + header
   -------------------------------------------------------------------------- */
.topbar {
	background: var(--dt-navy);
	color: #cfdcf5;
	font-size: 0.88rem;
	padding: 8px 0;
}
.topbar__inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.topbar a { color: #fff; font-weight: 600; }

.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	background: #fff;
	border-bottom: 1px solid var(--dt-line);
}
.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 24px;
	min-height: 72px;
}

.site-logo { display: flex; align-items: center; gap: 10px; font-family: var(--dt-font-head); }
.site-logo:hover { text-decoration: none; }
.site-logo__mark {
	display: grid;
	place-items: center;
	width: 40px; height: 40px;
	border-radius: 10px;
	background: var(--dt-blue);
	color: #fff;
	font-weight: 800;
	font-size: 0.95rem;
	letter-spacing: 0.02em;
}
.site-logo__text { font-weight: 800; font-size: 1.25rem; color: var(--dt-navy); }

.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav__list { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.site-nav__list a { color: var(--dt-ink); font-weight: 600; }
.site-nav__list a:hover { color: var(--dt-blue); text-decoration: none; }
.site-nav__actions { display: flex; gap: 12px; }

.nav-toggle { display: none; background: none; border: 0; padding: 10px; cursor: pointer; }
.nav-toggle__bar { display: block; width: 24px; height: 2.5px; background: var(--dt-navy); margin: 5px 0; border-radius: 2px; }

/* Hero
   -------------------------------------------------------------------------- */
.hero {
	background: linear-gradient(160deg, #f2f7ff 0%, #fff 55%, #f5f9ff 100%);
	padding: 72px 0 80px;
}
.hero__inner {
	display: grid;
	grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
	gap: 56px;
	align-items: center;
}
.eyebrow {
	font-weight: 700;
	font-size: 0.85rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--dt-blue);
	margin-bottom: 14px;
}
.eyebrow--light { color: #9db9e8; }
.hero__sub { font-size: 1.18rem; color: var(--dt-gray); max-width: 34em; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 26px 0 20px; }
.hero__checks { list-style: none; display: flex; gap: 22px; flex-wrap: wrap; padding: 0; margin: 0; color: var(--dt-gray); font-weight: 600; font-size: 0.95rem; }
.hero__checks li::before { content: "\2713"; color: var(--dt-blue); font-weight: 800; margin-right: 8px; }

.hero__panel { display: grid; gap: 16px; }
.hero-stat {
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	box-shadow: var(--dt-shadow);
	padding: 22px 26px;
	display: flex;
	align-items: baseline;
	gap: 18px;
}
.hero-stat__num {
	font-family: var(--dt-font-head);
	font-size: 2rem;
	font-weight: 800;
	color: var(--dt-blue);
	min-width: 3.4em;
}
.hero-stat__label { color: var(--dt-gray); font-size: 0.95rem; }

/* Trust bar
   -------------------------------------------------------------------------- */
.trustbar { border-block: 1px solid var(--dt-line); padding: 26px 0; background: #fff; }
.trustbar--tight { border-top: 0; }
.trustbar__label { text-align: center; color: var(--dt-gray); font-size: 0.9rem; margin-bottom: 14px; }
.trustbar__logos {
	list-style: none;
	display: flex;
	justify-content: center;
	flex-wrap: wrap;
	gap: 18px 44px;
	margin: 0; padding: 0;
}
.trustbar__logos li {
	font-family: var(--dt-font-head);
	font-weight: 700;
	font-size: 1.15rem;
	color: #97a3b5;
	letter-spacing: 0.01em;
}

/* Sections
   -------------------------------------------------------------------------- */
.section { padding: 72px 0; }
.section--alt { background: var(--dt-bg-alt); }
.section__head { max-width: 640px; margin-bottom: 40px; }
.section__head p { color: var(--dt-gray); font-size: 1.1rem; }
.section__cta { text-align: center; margin-top: 40px; }

/* Course cards
   -------------------------------------------------------------------------- */
.course-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 26px;
}
.course-card {
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	overflow: hidden;
	transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.course-card:hover { box-shadow: var(--dt-shadow-lg); transform: translateY(-3px); }
.course-card__link { display: block; color: inherit; }
.course-card__link:hover { text-decoration: none; }

.course-card__media { position: relative; }
.course-card__placeholder {
	aspect-ratio: 16 / 10;
	display: grid;
	place-items: center;
	background: linear-gradient(135deg, var(--dt-blue) 0%, var(--dt-navy) 100%);
}
.course-card__placeholder span {
	font-family: var(--dt-font-head);
	font-size: 3.2rem;
	font-weight: 800;
	color: rgba(255, 255, 255, 0.85);
}
.course-card__tag {
	position: absolute;
	top: 14px; left: 14px;
	background: #fff;
	color: var(--dt-navy);
	font-size: 0.78rem;
	font-weight: 700;
	padding: 5px 12px;
	border-radius: 999px;
	box-shadow: var(--dt-shadow);
}

.course-card__body { padding: 22px 22px 24px; }
.course-card__title { margin-bottom: 8px; font-size: 1.18rem; }
.course-card__excerpt { color: var(--dt-gray); font-size: 0.95rem; margin-bottom: 14px; }
.course-card__meta {
	display: flex; flex-wrap: wrap; align-items: center; gap: 7px;
	color: var(--dt-gray); font-size: 0.88rem; font-weight: 600;
	margin-bottom: 16px;
}
.stars { color: var(--dt-gold); letter-spacing: 2px; }
.dot { color: var(--dt-line); }

.course-card__footer { border-top: 1px solid var(--dt-line); padding-top: 14px; }
.course-card__price {
	font-family: var(--dt-font-head);
	font-weight: 800;
	font-size: 1.3rem;
	color: var(--dt-navy);
	margin-right: 10px;
}
.course-card__plan { color: var(--dt-gray); font-size: 0.85rem; }

/* Features / steps / testimonials
   -------------------------------------------------------------------------- */
.feature-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 26px;
}
.feature {
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	padding: 28px;
}
.feature__icon { font-size: 1.8rem; display: block; margin-bottom: 12px; }
.feature p { color: var(--dt-gray); font-size: 0.98rem; margin: 0; }

.steps {
	list-style: none;
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 26px;
	padding: 0; margin: 0;
	counter-reset: step;
}
.step { position: relative; padding-top: 8px; }
.step__num {
	display: grid; place-items: center;
	width: 44px; height: 44px;
	border-radius: 50%;
	background: var(--dt-blue-tint);
	color: var(--dt-blue);
	font-family: var(--dt-font-head);
	font-weight: 800;
	font-size: 1.1rem;
	margin-bottom: 14px;
}
.step p { color: var(--dt-gray); font-size: 0.95rem; margin: 0; }

.testimonial-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 26px;
}
.testimonial {
	margin: 0;
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	padding: 28px;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
}
.testimonial p { font-size: 1.02rem; }
.testimonial footer { color: var(--dt-gray); font-size: 0.9rem; }

/* Guarantee
   -------------------------------------------------------------------------- */
.guarantee {
	display: flex;
	gap: 26px;
	align-items: center;
	background: var(--dt-blue-tint);
	border-radius: var(--dt-radius);
	padding: 36px 40px;
}
.guarantee--inline { background: var(--dt-blue-tint); }
.guarantee__badge {
	flex: 0 0 auto;
	display: grid; place-items: center;
	width: 64px; height: 64px;
	border-radius: 50%;
	background: var(--dt-blue);
	color: #fff;
	font-size: 1.6rem;
}
.guarantee h2 { font-size: 1.4rem; margin-bottom: 6px; }
.guarantee p { margin: 0; color: var(--dt-gray); }

/* Page hero (inner pages)
   -------------------------------------------------------------------------- */
.page-hero {
	background: linear-gradient(160deg, #f2f7ff 0%, #fff 100%);
	padding: 60px 0 48px;
	border-bottom: 1px solid var(--dt-line);
}
.page-hero__sub { color: var(--dt-gray); font-size: 1.15rem; max-width: 40em; }

/* Course catalog
   -------------------------------------------------------------------------- */
.filterbar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.filterbar__item {
	padding: 8px 18px;
	border-radius: 999px;
	border: 1.5px solid var(--dt-line);
	color: var(--dt-ink);
	font-weight: 600;
	font-size: 0.92rem;
}
.filterbar__item:hover { border-color: var(--dt-blue); color: var(--dt-blue); text-decoration: none; }
.filterbar__item.is-active { background: var(--dt-navy); border-color: var(--dt-navy); color: #fff; }

/* Single course
   -------------------------------------------------------------------------- */
.course-hero { background: var(--dt-navy); color: #fff; padding: 64px 0; }
.course-hero__inner {
	display: grid;
	grid-template-columns: minmax(0, 1.5fr) minmax(320px, 1fr);
	gap: 48px;
	align-items: start;
}
.course-hero h1 { color: #fff; font-size: clamp(1.8rem, 3.6vw, 2.7rem); }
.course-hero__sub { color: #c6d4ec; font-size: 1.12rem; max-width: 36em; }
.course-hero__meta {
	display: flex; flex-wrap: wrap; align-items: center; gap: 9px;
	color: #c6d4ec; font-weight: 600; font-size: 0.95rem;
	margin-top: 18px;
}
.course-hero__meta .dot { color: #3d5175; }

.enroll-card {
	background: #fff;
	border-radius: var(--dt-radius);
	box-shadow: var(--dt-shadow-lg);
	padding: 28px;
	color: var(--dt-ink);
}
.enroll-card__price { margin-bottom: 18px; }
.enroll-card__amount {
	display: block;
	font-family: var(--dt-font-head);
	font-size: 2.3rem;
	font-weight: 800;
	color: var(--dt-navy);
}
.enroll-card__plan { color: var(--dt-gray); font-size: 0.95rem; }
.enroll-card .btn { margin-bottom: 10px; }
.enroll-card__list { list-style: none; padding: 0; margin: 14px 0 0; border-top: 1px solid var(--dt-line); }
.enroll-card__list li { padding: 9px 0 0; color: var(--dt-gray); font-size: 0.93rem; }
.enroll-card__list li::before { content: "\2713"; color: var(--dt-blue); font-weight: 800; margin-right: 9px; }

.course-layout {
	display: grid;
	grid-template-columns: minmax(0, 1.6fr) minmax(280px, 1fr);
	gap: 48px;
	padding: 64px 24px;
}
.course-block { margin-bottom: 48px; }
.course-block h2 { font-size: 1.5rem; margin-bottom: 20px; }

.checklist { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 28px; }
.checklist--tight { grid-template-columns: 1fr; gap: 9px; }
.checklist li { padding-left: 30px; position: relative; }
.checklist li::before {
	content: "\2713";
	position: absolute; left: 0;
	color: var(--dt-blue);
	font-weight: 800;
}

.accordion__item {
	border: 1px solid var(--dt-line);
	border-radius: 10px;
	margin-bottom: 10px;
	background: #fff;
	padding: 0;
}
.accordion__item summary {
	cursor: pointer;
	list-style: none;
	padding: 18px 22px;
	font-weight: 700;
	color: var(--dt-navy);
	display: flex;
	align-items: center;
	gap: 12px;
}
.accordion__item summary::-webkit-details-marker { display: none; }
.accordion__item summary::after { content: "+"; margin-left: auto; color: var(--dt-blue); font-size: 1.3rem; font-weight: 700; }
.accordion__item[open] summary::after { content: "\2212"; }
.accordion__item p { padding: 0 22px 18px; margin: 0; color: var(--dt-gray); }
.accordion__num { color: var(--dt-blue); font-family: var(--dt-font-head); font-weight: 800; }

.instructor { display: flex; gap: 20px; align-items: center; }
.instructor__avatar {
	flex: 0 0 auto;
	width: 72px; height: 72px;
	border-radius: 50%;
	display: grid; place-items: center;
	background: var(--dt-blue-tint);
	color: var(--dt-blue);
	font-family: var(--dt-font-head);
	font-size: 1.7rem;
	font-weight: 800;
}
.instructor p { margin: 0; color: var(--dt-gray); }

.sidecard {
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	padding: 26px;
	margin-bottom: 22px;
	position: sticky;
	top: 96px;
}
.sidecard__list { list-style: none; padding: 0; margin: 0 0 18px; }
.sidecard__list li {
	display: flex; justify-content: space-between; gap: 14px;
	padding: 9px 0;
	border-bottom: 1px solid var(--dt-line);
	font-size: 0.95rem;
	color: var(--dt-gray);
}
.sidecard__list li strong { color: var(--dt-navy); }

/* Pricing page
   -------------------------------------------------------------------------- */
.pricing-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 26px;
	align-items: stretch;
}
.pricing-card {
	position: relative;
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	padding: 32px 28px;
	display: flex;
	flex-direction: column;
}
.pricing-card--featured { border: 2px solid var(--dt-blue); box-shadow: var(--dt-shadow-lg); }
.pricing-card__badge {
	position: absolute;
	top: -13px; left: 28px;
	background: var(--dt-blue);
	color: #fff;
	font-size: 0.78rem;
	font-weight: 700;
	padding: 4px 14px;
	border-radius: 999px;
}
.pricing-card__figure {
	font-family: var(--dt-font-head);
	font-size: 1.7rem;
	font-weight: 800;
	color: var(--dt-blue);
	margin-bottom: 10px;
}
.pricing-card p { color: var(--dt-gray); }
.pricing-card .checklist { margin: 8px 0 24px; }
.pricing-card .btn { margin-top: auto; }

.table-wrap { overflow-x: auto; }
.pricing-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--dt-radius); overflow: hidden; }
.pricing-table th, .pricing-table td { text-align: left; padding: 16px 18px; border-bottom: 1px solid var(--dt-line); }
.pricing-table th { background: var(--dt-navy); color: #fff; font-family: var(--dt-font-head); font-size: 0.9rem; }
.pricing-table tr:hover td { background: var(--dt-blue-tint); }

/* About page
   -------------------------------------------------------------------------- */
.about-cols {
	display: grid;
	grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
	gap: 48px;
	align-items: start;
}
.about-cols p { color: var(--dt-gray); font-size: 1.05rem; }
.stat-stack { display: grid; gap: 16px; }

/* Contact page
   -------------------------------------------------------------------------- */
.contact-cols {
	display: grid;
	grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr);
	gap: 48px;
	align-items: start;
}
.contact-form-card {
	background: #fff;
	border: 1px solid var(--dt-line);
	border-radius: var(--dt-radius);
	box-shadow: var(--dt-shadow);
	padding: 36px;
}
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-weight: 700; margin-bottom: 6px; color: var(--dt-navy); font-size: 0.95rem; }
.form-row input, .form-row select, .form-row textarea {
	width: 100%;
	padding: 12px 14px;
	border: 1.5px solid var(--dt-line);
	border-radius: 8px;
	font-family: inherit;
	font-size: 1rem;
	background: #fff;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
	outline: none;
	border-color: var(--dt-blue);
	box-shadow: 0 0 0 3px rgba(0, 86, 210, 0.15);
}
.form-note { color: var(--dt-gray); font-size: 0.88rem; text-align: center; margin: 14px 0 0; }
.contact-aside .sidecard { position: static; }

/* CTA band + footer
   -------------------------------------------------------------------------- */
.cta-band { background: var(--dt-blue); color: #fff; padding: 56px 0; }
.cta-band__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 32px;
	flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin-bottom: 8px; }
.cta-band p { color: #d5e3fb; margin: 0; max-width: 44em; }

.site-footer { background: var(--dt-navy); color: #b9c7de; padding: 56px 0 0; font-size: 0.95rem; }
.site-footer__grid {
	display: grid;
	grid-template-columns: 1.4fr 1fr 1fr 1fr;
	gap: 40px;
	padding-bottom: 40px;
}
.site-footer h3 { color: #fff; font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 9px; }
.site-footer a { color: #b9c7de; }
.site-footer a:hover { color: #fff; }
.site-logo--footer .site-logo__text { color: #fff; }
.site-footer__bottom { border-top: 1px solid rgba(255, 255, 255, 0.12); padding: 20px 24px; }
.site-footer__bottom p { margin: 0; font-size: 0.85rem; color: #8296b5; }

/* Blog fallback
   -------------------------------------------------------------------------- */
.post-item { border-bottom: 1px solid var(--dt-line); padding-bottom: 28px; margin-bottom: 28px; }
.post-item__date { color: var(--dt-gray); font-size: 0.88rem; }
.entry-content img { border-radius: var(--dt-radius); }

/* Pagination
   -------------------------------------------------------------------------- */
.pagination .nav-links { display: flex; gap: 8px; justify-content: center; }
.pagination .page-numbers {
	padding: 8px 15px;
	border: 1.5px solid var(--dt-line);
	border-radius: 8px;
	font-weight: 600;
}
.pagination .page-numbers.current { background: var(--dt-blue); border-color: var(--dt-blue); color: #fff; }

/* Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1000px) {
	.hero__inner, .course-hero__inner, .about-cols, .contact-cols, .course-layout { grid-template-columns: 1fr; }
	.course-grid, .feature-grid, .testimonial-grid, .pricing-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
	.site-footer__grid { grid-template-columns: 1fr 1fr; }
	.sidecard { position: static; }
}

@media (max-width: 680px) {
	.course-grid, .feature-grid, .testimonial-grid, .pricing-grid, .steps { grid-template-columns: 1fr; }
	.checklist { grid-template-columns: 1fr; }
	.section { padding: 52px 0; }
	.hero { padding: 48px 0 56px; }
	.guarantee { flex-direction: column; text-align: center; }
	.site-footer__grid { grid-template-columns: 1fr; }

	.nav-toggle { display: block; }
	.site-nav {
		display: none;
		position: absolute;
		top: 100%; left: 0; right: 0;
		background: #fff;
		border-bottom: 1px solid var(--dt-line);
		box-shadow: var(--dt-shadow-lg);
		flex-direction: column;
		align-items: stretch;
		padding: 18px 24px 24px;
		gap: 16px;
	}
	.site-nav.is-open { display: flex; }
	.site-nav__list { flex-direction: column; gap: 4px; }
	.site-nav__list a { display: block; padding: 10px 0; font-size: 1.05rem; }
	.site-nav__actions { flex-direction: column; }
}