@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

/* ===== Design Tokens (Rodosto OSGB brand) ===== */
:root {
  --color-accent: #0033E7;
  --color-accent-light: #3D5CFF;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F2F2F2;
  --color-fg: #111111;
  --color-card: #FFFFFF;
  --color-muted: #E2E2E2;
  --color-muted-fg: #444444;
  --color-border: #DDDDDD;
  --color-success: #16A34A;
  --color-danger: #DC2626;
  --color-warning: #D97706;

  --font-heading: 'Plus Jakarta Sans', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;

  --space-1: .5rem; --space-2: 1rem; --space-3: 1.5rem; --space-4: 2rem; --space-5: 3rem; --space-6: 4rem;
  --radius-sm: 8px; --radius-md: 12px; --radius-lg: 20px; --radius-full: 999px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.08);
  --shadow-md: 0 8px 20px rgba(15,23,42,.08);
  --shadow-lg: 0 20px 40px rgba(15,23,42,.14);
  --ease-standard: cubic-bezier(.22,1,.36,1);
  --transition: 220ms var(--ease-standard);
  --container: 1100px;
  --header-h: 76px;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: .001ms !important; } }
body { font-family: var(--font-body); font-size: 1rem; line-height: 1.6; color: var(--color-fg); background: var(--color-bg); padding-top: var(--header-h); -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; letter-spacing: -.01em; color: var(--color-fg); }
h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }
p { color: var(--color-muted-fg); }
.skip-link { position: absolute; top: -100px; left: var(--space-2); z-index: 200; background: var(--color-fg); color: #fff; padding: .75rem 1.25rem; border-radius: var(--radius-sm); transition: top var(--transition); }
.skip-link:focus { top: var(--space-2); }
:focus-visible { outline: 3px solid var(--color-accent-light); outline-offset: 2px; border-radius: 4px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--space-3); }
.section { padding: var(--space-6) 0; }
.section-alt { background: var(--color-bg-alt); }
.section-head { max-width: 640px; margin-bottom: var(--space-4); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { margin-top: var(--space-2); font-size: 1.05rem; }

.eyebrow { display: inline-flex; align-items: center; gap: .5rem; font-family: var(--font-heading); font-weight: 600; font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--color-accent); background: rgba(0,51,231,.1); padding: .4rem .9rem; border-radius: var(--radius-full); margin-bottom: var(--space-2); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .6rem; font-family: var(--font-heading); font-weight: 600; font-size: .98rem; padding: .9rem 1.6rem; border-radius: var(--radius-sm); border: 2px solid transparent; cursor: pointer; transition: transform var(--transition), box-shadow var(--transition), background var(--transition); min-height: 44px; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--color-accent); color: #fff; box-shadow: var(--shadow-md); }
.btn-primary:hover { background: var(--color-accent-light); box-shadow: var(--shadow-lg); }
.btn-outline { background: transparent; border-color: var(--color-border); color: var(--color-fg); }
.btn-outline:hover { background: var(--color-bg-alt); }
.btn svg { width: 18px; height: 18px; }

/* ===== Header ===== */
.site-header { position: fixed; top: 0; left: 0; right: 0; height: var(--header-h); z-index: 100; background: rgba(255,255,255,.85); backdrop-filter: blur(12px) saturate(160%); border-bottom: 1px solid var(--color-border); }
.header-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.brand { display: flex; align-items: center; gap: .6rem; }
.brand-logo-img { height: 34px; width: auto; }
.brand-badge { font-family: var(--font-heading); font-weight: 700; font-size: .82rem; color: var(--color-muted-fg); padding-left: .6rem; border-left: 1px solid var(--color-border); }
.header-back { display: inline-flex; align-items: center; gap: .4rem; font-family: var(--font-heading); font-weight: 600; font-size: .9rem; color: var(--color-muted-fg); }
.header-back svg { width: 16px; height: 16px; }
.header-back:hover { color: var(--color-accent); }

/* ===== Hero ===== */
.hero { padding: var(--space-6) 0 var(--space-5); background: linear-gradient(160deg, #FFFFFF 0%, #EDEFFC 60%, #FFFFFF 100%); text-align: center; }
.hero .lead { max-width: 620px; margin: var(--space-2) auto 0; font-size: 1.15rem; }
.hero-note { max-width: 640px; margin: var(--space-3) auto 0; font-size: .84rem; color: var(--color-muted-fg); background: var(--color-bg-alt); padding: .8rem 1.1rem; border-radius: var(--radius-md); }

/* ===== Course cards ===== */
.grid { display: grid; gap: var(--space-3); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-3 { grid-template-columns: 1fr; } }

.course-card { display: flex; flex-direction: column; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform var(--transition), box-shadow var(--transition); }
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.course-card-media { aspect-ratio: 16/9; background: linear-gradient(160deg, var(--color-accent), #001A8C); display: flex; align-items: center; justify-content: center; color: #fff; position: relative; }
.course-card-media svg { width: 40px; height: 40px; opacity: .85; }
.course-card-tag { position: absolute; top: .8rem; left: .8rem; font-family: var(--font-heading); font-weight: 700; font-size: .7rem; letter-spacing: .05em; text-transform: uppercase; background: rgba(255,255,255,.16); color: #fff; padding: .3rem .7rem; border-radius: var(--radius-full); backdrop-filter: blur(4px); }
.course-card-body { padding: var(--space-3); display: flex; flex-direction: column; gap: .6rem; flex: 1; }
.course-card-meta { display: flex; gap: .8rem; font-size: .8rem; color: var(--color-muted-fg); }
.course-card-meta span { display: flex; align-items: center; gap: .3rem; }
.course-card-meta svg { width: 14px; height: 14px; }
.course-card-link { margin-top: auto; display: inline-flex; align-items: center; gap: .4rem; font-family: var(--font-heading); font-weight: 600; color: var(--color-accent); font-size: .9rem; }
.course-card-link svg { width: 16px; height: 16px; transition: transform var(--transition); }
.course-card:hover .course-card-link svg { transform: translateX(4px); }

/* ===== Course detail page ===== */
.course-hero { padding: var(--space-5) 0 var(--space-4); background: var(--color-bg-alt); }
.breadcrumb { display: flex; align-items: center; gap: .5rem; font-size: .85rem; color: var(--color-muted-fg); margin-bottom: var(--space-2); }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb svg { width: 14px; height: 14px; }

.video-frame { position: relative; width: 100%; aspect-ratio: 16/9; border-radius: var(--radius-lg); overflow: hidden; background: #0B1220; box-shadow: var(--shadow-md); }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-placeholder { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .8rem; color: rgba(255,255,255,.75); text-align: center; padding: var(--space-3); }
.video-placeholder svg { width: 48px; height: 48px; opacity: .6; }
.video-placeholder strong { color: #fff; font-family: var(--font-heading); }
.video-placeholder span { font-size: .88rem; max-width: 380px; }

.lesson-body { max-width: 760px; margin: var(--space-5) auto 0; }
.lesson-body h2 { margin-top: var(--space-4); }
.lesson-body h2:first-child { margin-top: 0; }
.lesson-body p { margin-top: var(--space-2); font-size: 1.02rem; color: var(--color-fg); line-height: 1.75; }
.lesson-body ul { margin-top: var(--space-2); display: flex; flex-direction: column; gap: .6rem; }
.lesson-body ul li { display: flex; align-items: flex-start; gap: .7rem; font-size: 1rem; color: var(--color-fg); }
.lesson-body ul li svg { width: 20px; height: 20px; color: var(--color-success); flex-shrink: 0; margin-top: 3px; }

/* ===== Quiz ===== */
.quiz-box { max-width: 760px; margin: var(--space-5) auto 0; padding: var(--space-4); border-radius: var(--radius-lg); border: 1px solid var(--color-border); background: var(--color-card); box-shadow: var(--shadow-sm); }
.quiz-question { padding: var(--space-3) 0; border-bottom: 1px solid var(--color-border); }
.quiz-question:last-of-type { border-bottom: none; }
.quiz-question-title { font-family: var(--font-heading); font-weight: 700; font-size: 1rem; margin-bottom: .8rem; }
.quiz-options { display: flex; flex-direction: column; gap: .55rem; }
.quiz-option { display: flex; align-items: center; gap: .7rem; padding: .7rem .9rem; border: 1.5px solid var(--color-border); border-radius: var(--radius-md); cursor: pointer; transition: border-color var(--transition), background var(--transition); }
.quiz-option:hover { border-color: var(--color-accent-light); }
.quiz-option input { accent-color: var(--color-accent); width: 18px; height: 18px; flex-shrink: 0; }
.quiz-option.is-correct { border-color: var(--color-success); background: rgba(22,163,74,.06); }
.quiz-option.is-wrong { border-color: var(--color-danger); background: rgba(220,38,38,.06); }
.quiz-result { display: none; margin-top: var(--space-3); padding: var(--space-3); border-radius: var(--radius-md); text-align: center; }
.quiz-result.is-visible { display: block; }
.quiz-result.pass { background: rgba(22,163,74,.08); color: var(--color-success); }
.quiz-result.fail { background: rgba(220,38,38,.06); color: var(--color-danger); }
.quiz-result h3 { color: inherit; }
.quiz-result p { color: inherit; opacity: .85; margin-top: .3rem; }

/* ===== CTA ===== */
.cta-band { background: linear-gradient(160deg, var(--color-accent), #001A8C 130%); border-radius: var(--radius-lg); padding: var(--space-5) var(--space-4); text-align: center; color: #fff; }
.cta-band .eyebrow { background: rgba(255,255,255,.15); color: #fff; }
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,.85); margin-top: .6rem; max-width: 480px; margin-left: auto; margin-right: auto; }
.cta-band .btn-primary { background: #fff; color: var(--color-accent); margin-top: var(--space-3); }
.cta-band .btn-primary:hover { background: var(--color-bg-alt); }

/* ===== Footer ===== */
.site-footer { background: var(--color-bg-alt); padding: var(--space-4) 0; border-top: 1px solid var(--color-border); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2); font-size: .85rem; color: var(--color-muted-fg); }
.footer-inner a { color: var(--color-accent); font-weight: 600; }