/* ==========================================================================
   changedrivingtest.uk — main.css
   Design system + all reusable components. Mobile-first.
   Sections:
   01 Fonts        02 Tokens       03 Base         04 Layout helpers
   05 Header/nav   06 Hero         07 Buttons      08 Boxes (info/warn/key)
   09 Step cards   10 Tables       11 FAQ          12 Cards/related
   13 Breadcrumbs/TOC              14 Author box   15 Forms
   16 Footer       17 Utilities    18 Print/motion
   ========================================================================== */

/* --- 01 Fonts (self-hosted Poppins) ------------------------------------ */
@font-face{font-family:"Poppins";font-style:normal;font-weight:400;font-display:swap;src:url("/assets/fonts/poppins-latin-400-normal.woff2") format("woff2")}
@font-face{font-family:"Poppins";font-style:normal;font-weight:500;font-display:swap;src:url("/assets/fonts/poppins-latin-500-normal.woff2") format("woff2")}
@font-face{font-family:"Poppins";font-style:normal;font-weight:600;font-display:swap;src:url("/assets/fonts/poppins-latin-600-normal.woff2") format("woff2")}
@font-face{font-family:"Poppins";font-style:normal;font-weight:700;font-display:swap;src:url("/assets/fonts/poppins-latin-700-normal.woff2") format("woff2")}

/* --- 02 Design tokens --------------------------------------------------- */
:root{
  --color-primary:#123b5d;
  --color-primary-dark:#0b2942;
  --color-primary-tint:#e8eff5;
  --color-accent:#f4b942;
  --color-accent-dark:#8a6206;
  --color-text:#17212b;
  --color-muted:#5d6873;
  --color-background:#ffffff;
  --color-surface:#f5f8fa;
  --color-border:#dce3e8;
  --color-success:#1d7a46;
  --color-success-bg:#e9f6ee;
  --color-warning:#9a5b00;
  --color-warning-bg:#fdf3e0;

  --font-family:"Poppins",Arial,sans-serif;

  --fs-sm:.875rem;
  --fs-base:1rem;
  --fs-lg:1.125rem;
  --fs-h4:1.125rem;
  --fs-h3:1.3rem;
  --fs-h2:1.65rem;
  --fs-h1:2.1rem;

  --space-1:.25rem; --space-2:.5rem; --space-3:.75rem; --space-4:1rem;
  --space-5:1.5rem; --space-6:2rem;  --space-7:3rem;   --space-8:4.5rem;

  --container-width:1180px;
  --content-width:760px;
  --radius-small:8px;
  --radius-medium:14px;
  --shadow-card:0 8px 30px rgba(0,0,0,.07);
  --shadow-soft:0 2px 10px rgba(0,0,0,.06);
  --header-height:70px;
}
@media (min-width:768px){
  :root{--fs-h1:2.6rem;--fs-h2:1.85rem;--fs-h3:1.4rem}
}

/* --- 03 Base ------------------------------------------------------------ */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-height) + 1rem)}
body{
  margin:0;font-family:var(--font-family);font-size:var(--fs-base);
  line-height:1.7;color:var(--color-text);background:var(--color-background);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{line-height:1.25;color:var(--color-primary-dark);margin:0 0 var(--space-4)}
h1{font-size:var(--fs-h1);font-weight:700}
h2{font-size:var(--fs-h2);font-weight:600;margin-top:var(--space-7)}
h3{font-size:var(--fs-h3);font-weight:600;margin-top:var(--space-6)}
h4{font-size:var(--fs-h4);font-weight:600;margin-top:var(--space-5)}
p{margin:0 0 var(--space-4)}
ul,ol{margin:0 0 var(--space-4);padding-left:1.4rem}
li{margin-bottom:var(--space-2)}
a{color:var(--color-primary);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--color-primary-dark)}
img{max-width:100%;height:auto;display:block}
strong{font-weight:600}
hr{border:0;border-top:1px solid var(--color-border);margin:var(--space-6) 0}
:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px;border-radius:2px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--color-primary-dark);color:#fff;padding:.6rem 1rem;z-index:200;border-radius:0 0 var(--radius-small) 0}
.skip-link:focus{left:0}

/* --- 04 Layout helpers -------------------------------------------------- */
.container{max-width:var(--container-width);margin:0 auto;padding:0 var(--space-4)}
.content{max-width:var(--content-width)}
.section{padding:var(--space-6) 0}
.section--alt{background:var(--color-surface)}
.grid{display:grid;gap:var(--space-4)}
@media (min-width:640px){.grid--2{grid-template-columns:1fr 1fr}.grid--3{grid-template-columns:repeat(2,1fr)}}
@media (min-width:960px){.grid--3{grid-template-columns:repeat(3,1fr)}.grid--4{grid-template-columns:repeat(4,1fr)}}
.article-layout{display:grid;gap:var(--space-6)}
@media (min-width:1024px){.article-layout{grid-template-columns:minmax(0,1fr) 300px;align-items:start}}

/* --- 05 Header / navigation --------------------------------------------- */
.topbar{background:var(--color-primary-dark);color:#e2ecf4;font-size:var(--fs-sm);padding:.5rem 0;text-align:center;border-bottom:2px solid var(--color-accent)}
.topbar a{color:var(--color-accent);font-weight:600;text-decoration-thickness:1px}
.topbar a:hover{color:#ffd884}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:saturate(160%) blur(8px);-webkit-backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-soft)}
.site-header .container{display:flex;align-items:center;gap:var(--space-4);min-height:var(--header-height)}
.brand{display:flex;align-items:center;gap:.65rem;text-decoration:none;color:var(--color-primary-dark);font-weight:700;font-size:1.08rem;letter-spacing:-.01em;white-space:nowrap}
.brand img{width:42px;height:42px}
.brand span b{color:var(--color-accent-dark);font-weight:700}
.nav-toggle{margin-left:auto;background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-small);padding:.55rem .8rem;font:inherit;font-weight:600;color:var(--color-primary-dark);cursor:pointer;display:flex;align-items:center;gap:.45rem;box-shadow:var(--shadow-soft)}
.nav-toggle:hover{border-color:var(--color-primary)}
.nav-toggle svg{width:20px;height:20px}
.nav-toggle[aria-expanded="true"]{background:var(--color-primary-tint);border-color:var(--color-primary)}

/* Mobile menu panel */
.site-nav{display:none}
.site-nav.is-open{display:block;position:absolute;top:100%;left:0;right:0;background:var(--color-background);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-card);max-height:calc(100vh - var(--header-height));overflow-y:auto}
.site-nav ul{list-style:none;margin:0;padding:var(--space-3) var(--space-4)}
.site-nav li{margin:0}
.site-nav.is-open > ul > li + li{border-top:1px solid var(--color-surface)}
.site-nav a,.site-nav .nav-drop-btn{display:block;width:100%;text-align:left;padding:.7rem .55rem;text-decoration:none;color:var(--color-text);background:none;border:0;font:inherit;font-weight:500;border-radius:var(--radius-small);cursor:pointer}
.site-nav a:hover,.site-nav .nav-drop-btn:hover{background:var(--color-surface);color:var(--color-primary-dark)}
.site-nav a[aria-current="page"]{color:var(--color-primary);font-weight:600}
.nav-drop-btn::after{content:"";display:inline-block;margin-left:.45rem;border:4px solid transparent;border-top-color:currentColor;transform:translateY(2px);transition:transform .15s}
.nav-drop.is-open > .nav-drop-btn::after{transform:translateY(-2px) rotate(180deg)}
.nav-drop{position:relative}
.nav-drop-menu{list-style:none;margin:0;padding:0 0 .35rem var(--space-4);display:none}
.nav-drop.is-open > .nav-drop-menu{display:block}
.nav-drop-menu a{font-size:.95rem;color:var(--color-muted)}
.nav-cta{margin-top:var(--space-3);border-top:0 !important}
.nav-cta .btn{display:block;text-align:center}

/* Desktop bar (>=1200px so all 9 items + CTA align on one row) */
@media (min-width:1200px){
  .nav-toggle{display:none}
  .site-nav{display:block;margin-left:auto}
  .site-nav > ul{display:flex;align-items:center;gap:.1rem;padding:0}
  .site-nav.is-open > ul > li + li{border-top:0}
  .site-nav a,.site-nav .nav-drop-btn{position:relative;padding:.55rem .6rem;width:auto;font-size:.92rem;white-space:nowrap}
  .site-nav > ul > li > a::after,.site-nav .nav-drop-btn::before{content:"";position:absolute;left:.6rem;right:.6rem;bottom:.25rem;height:2px;background:var(--color-accent);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform .18s ease}
  .site-nav > ul > li > a:hover::after,.site-nav .nav-drop-btn:hover::before,.site-nav > ul > li > a[aria-current="page"]::after{transform:scaleX(1)}
  .site-nav > ul > li > a:hover,.site-nav .nav-drop-btn:hover{background:none}
  .nav-drop-menu{position:absolute;top:calc(100% + 6px);left:0;background:var(--color-background);border:1px solid var(--color-border);border-radius:var(--radius-medium);box-shadow:var(--shadow-card);min-width:250px;padding:.45rem;z-index:60}
  .nav-drop-menu::before{content:"";position:absolute;top:-6px;left:1.4rem;width:10px;height:10px;background:var(--color-background);border-left:1px solid var(--color-border);border-top:1px solid var(--color-border);transform:rotate(45deg)}
  .nav-drop-menu a{display:block;padding:.5rem .7rem;border-left:3px solid transparent;border-radius:6px;color:var(--color-text)}
  .nav-drop-menu a:hover{background:var(--color-primary-tint);border-left-color:var(--color-accent);color:var(--color-primary-dark)}
  .nav-cta{margin:0 0 0 var(--space-3)}
  .nav-cta .btn{display:inline-block;padding:.6rem 1.15rem;font-size:.95rem}
}

/* Header CTA: amber so it stands out from nav links */
.nav-cta .btn{background:var(--color-accent);color:var(--color-primary-dark);border-color:var(--color-accent);box-shadow:0 2px 8px rgba(244,185,66,.45)}
.nav-cta .btn:hover{background:#e5a92e;border-color:#e5a92e;color:var(--color-primary-dark)}

/* --- 06 Hero (homepage) — dark navy with amber accents ------------------- */
.hero{background:linear-gradient(150deg,var(--color-primary-dark) 0%,var(--color-primary) 62%,#1c4d78 100%);position:relative;overflow:hidden;padding:var(--space-7) 0 var(--space-7);color:#e7eef5}
.hero::before{content:"";position:absolute;left:-8%;right:-8%;top:54%;height:110px;background:var(--color-primary-dark);opacity:.5;transform:rotate(-3deg);border-top:4px dashed rgba(244,185,66,.55);pointer-events:none}
.hero .container{position:relative}
.hero h1{color:#fff;margin-bottom:var(--space-3);text-wrap:balance}
.hero h1::after{background:var(--color-accent)}
.hero .lede{font-size:var(--fs-lg);color:#cddcea;max-width:46rem}
.hero-actions{display:flex;flex-wrap:wrap;gap:var(--space-3);margin:var(--space-5) 0 var(--space-2)}
.hero .btn-primary{background:var(--color-accent);color:var(--color-primary-dark);border-color:var(--color-accent)}
.hero .btn-primary:hover{background:#ffd06a;border-color:#ffd06a;color:var(--color-primary-dark)}
.hero .btn-secondary{background:transparent;color:#fff;border-color:rgba(255,255,255,.65)}
.hero .btn-secondary:hover{background:rgba(255,255,255,.12);color:#fff}
.hero-note{font-size:var(--fs-sm);color:#a9bfd2}
.hero .eyebrow{background:rgba(244,185,66,.14);border:1px solid rgba(244,185,66,.45);color:var(--color-accent)}
.hero .disclaimer-inline{background:rgba(255,255,255,.07);border:1px dashed rgba(255,255,255,.3);color:#cddcea}
.hero .disclaimer-inline a{color:#fff}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--color-accent-dark);background:#fff;border:1px solid var(--color-border);border-radius:999px;padding:.28rem .85rem;margin-bottom:var(--space-4)}
/* Key facts strip — signature element (white cards pop on the navy hero) */
.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-3);margin-top:var(--space-6)}
@media (min-width:768px){.facts{grid-template-columns:repeat(4,1fr)}}
.fact{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-medium);padding:var(--space-4);box-shadow:0 10px 26px rgba(4,17,29,.28);border-top:4px solid var(--color-accent);text-align:center}
.fact b{display:block;font-size:2rem;font-weight:700;color:var(--color-primary);line-height:1.1}
.fact span{font-size:var(--fs-sm);color:var(--color-muted);line-height:1.4;display:block;margin-top:.35rem}

/* Page H1 accent underline (guides and site pages) */
h1::after{content:"";display:block;width:64px;height:4px;background:var(--color-accent);border-radius:2px;margin-top:.65rem}

/* --- 07 Buttons --------------------------------------------------------- */
.btn{display:inline-block;padding:.75rem 1.4rem;border-radius:var(--radius-small);font-weight:600;font-size:1rem;text-decoration:none;text-align:center;border:2px solid transparent;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--color-primary);color:#fff}
.btn-primary:hover{background:var(--color-primary-dark);color:#fff}
.btn-secondary{background:#fff;color:var(--color-primary);border-color:var(--color-primary)}
.btn-secondary:hover{background:var(--color-primary-tint)}
.btn-external::after{content:" \2197";font-weight:700}
.back-to-top{position:fixed;right:1rem;bottom:1rem;width:44px;height:44px;border-radius:50%;background:var(--color-primary);color:#fff;border:0;font-size:1.2rem;cursor:pointer;box-shadow:var(--shadow-card);opacity:0;pointer-events:none;transition:opacity .2s}
.back-to-top.is-visible{opacity:1;pointer-events:auto}

/* --- 08 Boxes ----------------------------------------------------------- */
.box{border-radius:var(--radius-medium);padding:var(--space-4) var(--space-5);margin:var(--space-5) 0;border:1px solid var(--color-border)}
.box > :last-child{margin-bottom:0}
.box-title{display:block;font-weight:600;margin-bottom:var(--space-2);color:inherit}
.box--info{background:var(--color-primary-tint);border-color:#c3d4e2}
.box--info .box-title{color:var(--color-primary-dark)}
.box--warning{background:var(--color-warning-bg);border-color:#efd9a8}
.box--warning .box-title{color:var(--color-warning)}
.box--success{background:var(--color-success-bg);border-color:#bfe3cd}
.box--success .box-title{color:var(--color-success)}
.box--key{background:var(--color-surface);border-left:5px solid var(--color-accent)}
.box--answer{background:#fff;border:2px solid var(--color-primary);box-shadow:var(--shadow-soft)}
.box--answer .box-title{color:var(--color-primary)}
.disclaimer-inline{font-size:var(--fs-sm);color:var(--color-muted);background:var(--color-surface);border:1px dashed var(--color-border);border-radius:var(--radius-small);padding:.6rem 1rem;margin:var(--space-4) 0}

/* --- 09 Step cards (dashed "road line" signature) ------------------------ */
.steps{list-style:none;counter-reset:step;margin:var(--space-5) 0;padding:0;position:relative}
.steps::before{content:"";position:absolute;left:21px;top:14px;bottom:14px;border-left:3px dashed var(--color-border)}
.step{counter-increment:step;position:relative;padding:0 0 var(--space-5) 3.6rem;margin:0}
.step:last-child{padding-bottom:0}
.step::before{content:counter(step);position:absolute;left:0;top:0;width:44px;height:44px;border-radius:50%;background:var(--color-accent);color:var(--color-primary-dark);font-weight:700;font-size:1.15rem;display:flex;align-items:center;justify-content:center;border:3px solid #fff;box-shadow:var(--shadow-soft)}
.step h3{margin-top:.35rem}
.step > :last-child{margin-bottom:0}

/* --- 10 Tables ----------------------------------------------------------- */
.table-wrap{overflow-x:auto;margin:var(--space-5) 0;border:1px solid var(--color-border);border-radius:var(--radius-medium);box-shadow:var(--shadow-soft)}
table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:560px}
caption{text-align:left;font-weight:600;padding:var(--space-3) var(--space-4);color:var(--color-primary-dark);background:var(--color-surface);border-bottom:1px solid var(--color-border);caption-side:top}
th,td{padding:.7rem var(--space-4);text-align:left;border-bottom:1px solid var(--color-border);vertical-align:top}
thead th{background:var(--color-primary);color:#fff;font-weight:600;font-size:.9rem}
tbody tr:last-child th,tbody tr:last-child td{border-bottom:0}
tbody th{font-weight:600;background:var(--color-surface)}

/* --- 11 FAQ accordions (native details) ----------------------------------- */
.faq{margin:var(--space-5) 0}
.faq details{border:1px solid var(--color-border);border-radius:var(--radius-small);margin-bottom:var(--space-3);background:#fff}
.faq summary{padding:var(--space-3) var(--space-4);font-weight:600;cursor:pointer;color:var(--color-primary-dark);list-style:none;display:flex;justify-content:space-between;gap:var(--space-3)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;line-height:1;color:var(--color-accent-dark);flex:none}
.faq details[open] summary::after{content:"\2212"}
.faq details[open] summary{border-bottom:1px solid var(--color-border)}
.faq .faq-a{padding:var(--space-3) var(--space-4)}
.faq .faq-a > :last-child{margin-bottom:0}

/* --- 12 Cards / related guides ------------------------------------------- */
.card{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-medium);padding:var(--space-5);box-shadow:var(--shadow-soft);display:flex;flex-direction:column}
.card h3{margin-top:0;font-size:1.1rem}
.card p{color:var(--color-muted);font-size:.95rem;flex:1}
.card .card-link{font-weight:600;text-decoration:none}
.card .card-link:hover{text-decoration:underline}
.card--hub{border-top:4px solid var(--color-accent)}

/* --- 13 Breadcrumbs / table of contents ----------------------------------- */
.breadcrumbs{font-size:var(--fs-sm);color:var(--color-muted);padding:var(--space-3) 0}
.breadcrumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}
.breadcrumbs li{margin:0}
.breadcrumbs li+li::before{content:"\203A";margin-right:.4rem;color:var(--color-border)}
.toc{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-medium);padding:var(--space-4) var(--space-5);margin:var(--space-5) 0}
.toc h2{margin:0 0 var(--space-3);font-size:1.05rem}
.toc ol{margin:0;padding-left:1.2rem}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}
.sidebar{position:sticky;top:calc(var(--header-height) + 1rem);display:none}
@media (min-width:1024px){.sidebar{display:block}}
.article-meta{font-size:var(--fs-sm);color:var(--color-muted);margin-bottom:var(--space-4)}

/* --- 14 Author box -------------------------------------------------------- */
.author-box{display:flex;gap:var(--space-4);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-medium);padding:var(--space-5);margin:var(--space-6) 0}
.author-box .avatar{flex:none;width:56px;height:56px;border-radius:50%;background:var(--color-primary);color:#fff;font-weight:600;font-size:1.2rem;display:flex;align-items:center;justify-content:center}
.author-box p{font-size:.95rem;margin-bottom:var(--space-2)}
.author-box .author-name{font-weight:600;color:var(--color-primary-dark)}

/* --- 15 Forms -------------------------------------------------------------- */
.form-field{margin-bottom:var(--space-4)}
.form-field label{display:block;font-weight:500;margin-bottom:.35rem}
.form-field input,.form-field select,.form-field textarea{width:100%;padding:.7rem .9rem;border:1px solid var(--color-border);border-radius:var(--radius-small);font:inherit;background:#fff;color:var(--color-text)}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{outline:3px solid var(--color-accent);outline-offset:1px;border-color:var(--color-primary)}
.form-hint{font-size:var(--fs-sm);color:var(--color-muted);margin-top:.25rem}
.hp-field{position:absolute;left:-9999px;height:0;overflow:hidden}

/* --- 16 Footer -------------------------------------------------------------- */
.site-footer{background:var(--color-primary-dark);color:#c6d3de;margin-top:var(--space-8);padding:var(--space-7) 0 var(--space-5);font-size:.95rem}
.site-footer a{color:#e8eff5}
.site-footer a:hover{color:var(--color-accent)}
.footer-grid{display:grid;gap:var(--space-6);grid-template-columns:1fr}
@media (min-width:768px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}}
.footer-brand img{width:40px;height:40px;margin-bottom:var(--space-3)}
.site-footer h2{color:#fff;font-size:1rem;margin:0 0 var(--space-3)}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:.45rem}
.footer-disclaimer{border-top:1px solid rgba(255,255,255,.15);margin-top:var(--space-6);padding-top:var(--space-5);font-size:var(--fs-sm);color:#9fb2c2}

/* --- 17 Utilities ------------------------------------------------------------ */
.text-muted{color:var(--color-muted)}
.text-small{font-size:var(--fs-sm)}
.mt-0{margin-top:0}.mb-0{margin-bottom:0}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
figure{margin:var(--space-5) 0}
figcaption{font-size:var(--fs-sm);color:var(--color-muted);margin-top:var(--space-2)}
figure img,.rounded{border-radius:var(--radius-medium);border:1px solid var(--color-border)}

/* --- 18 Reduced motion / print ------------------------------------------------ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
@media print{.site-header,.topbar,.site-footer,.back-to-top,.hero-actions{display:none}}

/* Form status messages (shown after contact handler redirect) */
.form-status {
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-small);
  font-weight: 500;
  margin-bottom: 1.25rem;
  border: 1px solid transparent;
}
.form-status--ok {
  background: #eef7ef;
  border-color: #bfe0c3;
  color: #1d5a26;
}
.form-status--err {
  background: #fdf1f0;
  border-color: #f2c4c0;
  color: #8a2a22;
}
.form-status:focus { outline: 3px solid var(--color-accent); outline-offset: 2px; }

/* --- 19 Header/footer polish additions ------------------------------------ */
.site-footer h2{position:relative;padding-bottom:.45rem}
.site-footer h2::after{content:"";position:absolute;left:0;bottom:0;width:34px;height:3px;background:var(--color-accent);border-radius:2px}
.footer-disclaimer p:last-child{margin-bottom:0;color:#8296a8}