/* ============================================================
   STAMP DUTY CALCULATOR — CORE STYLESHEET
   Design language: "Land Registry Ledger"
   Navy / Blue / Emerald / White, serif display + sans body + mono figures
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root{
  /* Colour */
  --navy-950: #0A1730;
  --navy-900: #0D1F3E;
  --navy-800: #12294F;
  --blue-700: #1E4B8C;
  --blue-600: #2B5FAD;
  --blue-400: #6B93D6;
  --emerald-700: #0B6B58;
  --emerald-600: #0E8C71;
  --emerald-400: #3FBBA0;
  --white: #FFFFFF;
  --off-white: #F5F7FA;
  --paper: #FBFAF7;
  --ink-900: #101828;
  --ink-700: #33415B;
  --ink-500: #64748B;
  --line: #E2E7F0;
  --line-strong: #C7D0E0;
  --gold-seal: #B98A3E;

  /* Type */
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  /* Scale */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(10,23,48,0.06), 0 1px 1px rgba(10,23,48,0.04);
  --shadow-md: 0 8px 24px -8px rgba(10,23,48,0.18);
  --shadow-lg: 0 24px 64px -16px rgba(10,23,48,0.28);
  --container: 1240px;
  --header-h: 76px;
}

[data-theme="dark"]{
  --off-white: #0D1526;
  --paper: #0F1830;
  --white: #14203C;
  --ink-900: #F2F5FA;
  --ink-700: #C9D3E4;
  --ink-500: #8C9BB8;
  --line: #263355;
  --line-strong: #33436B;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  font-family:var(--font-body);
  color:var(--ink-900);
  background:var(--off-white);
  line-height:1.6;
  font-size:16px;
  overflow-x:hidden;
  transition:background .3s ease,color .3s ease;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;}
button{font:inherit;cursor:pointer;border:none;background:none;}
input,select,textarea{font:inherit;}
:focus-visible{outline:3px solid var(--emerald-400);outline-offset:2px;}
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.15;color:var(--ink-900);}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--emerald-700);
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--emerald-600);}
.section{padding:96px 0;}
.section--tight{padding:64px 0;}
.section-head{max-width:680px;margin-bottom:52px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-head h2{font-size:clamp(1.8rem,3vw,2.6rem);margin-bottom:14px;}
.section-head p{color:var(--ink-500);font-size:1.05rem;}
.section--alt{background:var(--paper);}
.section--navy{background:var(--navy-900);color:var(--white);}
.section--navy .eyebrow{color:var(--emerald-400);}
.section--navy h2,.section--navy h3{color:var(--white);}
.section--navy p{color:#B7C2D9;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 28px;border-radius:var(--radius-sm);
  font-weight:600;font-size:.95rem;letter-spacing:.01em;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--emerald-600);color:var(--white);box-shadow:var(--shadow-sm);}
.btn-primary:hover{background:var(--emerald-700);transform:translateY(-2px);box-shadow:var(--shadow-md);}
.btn-secondary{background:transparent;color:var(--white);border:1.5px solid rgba(255,255,255,.4);}
.btn-secondary:hover{background:rgba(255,255,255,.1);border-color:#fff;}
.btn-outline{background:transparent;color:var(--blue-700);border:1.5px solid var(--line-strong);}
.btn-outline:hover{border-color:var(--blue-700);background:rgba(30,75,140,.06);}
.btn-block{width:100%;}
.btn-sm{padding:9px 16px;font-size:.82rem;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(10,23,48,0.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.08);
  height:var(--header-h);
}
.site-header .container{height:100%;display:flex;align-items:center;justify-content:space-between;}
.brand{display:flex;align-items:center;gap:10px;color:var(--white);font-family:var(--font-display);font-weight:600;font-size:1.25rem;}
.brand .seal{width:36px;height:36px;flex-shrink:0;}
.main-nav{display:flex;align-items:center;gap:32px;}
.main-nav a{color:#D7DEEC;font-size:.92rem;font-weight:500;position:relative;padding:6px 0;}
.main-nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--emerald-400);transition:width .2s ease;}
.main-nav a:hover{color:var(--white);}
.main-nav a:hover::after{width:100%;}
.header-actions{display:flex;align-items:center;gap:14px;}
.theme-toggle{
  width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:#D7DEEC;border:1px solid rgba(255,255,255,.18);
}
.theme-toggle:hover{background:rgba(255,255,255,.08);}
.hamburger{display:none;flex-direction:column;justify-content:center;gap:5px;width:26px;height:38px;flex-shrink:0;}
.hamburger span{height:2px;background:#fff;border-radius:2px;transition:transform .25s ease,opacity .25s ease;}
.hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger.active span:nth-child(2){opacity:0;}
.hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.mobile-nav{
  display:none;position:fixed;inset:var(--header-h) 0 0 0;background:var(--navy-950);
  z-index:999;padding:32px 24px;flex-direction:column;gap:6px;overflow-y:auto;
}
.mobile-nav.open{display:flex;}
.mobile-nav a{color:#EDF1FA;font-size:1.05rem;padding:14px 4px;border-bottom:1px solid rgba(255,255,255,.08);}
.mobile-nav .btn{margin-top:16px;}

/* ---------- Hero ---------- */
.hero{
  background:radial-gradient(circle at 15% 0%,#16305C 0%,var(--navy-950) 55%);
  color:var(--white);
  padding:72px 0 110px;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;right:-120px;top:-120px;width:520px;height:520px;
  background:radial-gradient(circle,rgba(15,140,113,.28),transparent 70%);
  pointer-events:none;
}
.hero .container{
  display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;position:relative;z-index:1;
}
.hero-copy h1{font-size:clamp(2.2rem,4.2vw,3.4rem);color:var(--white);margin-bottom:20px;}
.hero-copy h1 em{font-style:normal;color:var(--emerald-400);}
.hero-copy p{font-size:1.1rem;color:#B7C2D9;max-width:520px;margin-bottom:32px;}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:40px;}
.hero-trust{display:flex;gap:28px;flex-wrap:wrap;}
.hero-trust div{display:flex;flex-direction:column;}
.hero-trust strong{font-family:var(--font-mono);font-size:1.4rem;color:var(--white);}
.hero-trust span{font-size:.78rem;color:#8FA0C4;text-transform:uppercase;letter-spacing:.06em;}

/* Calculator Card */
.calc-card{
  background:var(--white);color:var(--ink-900);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);
  padding:34px;position:relative;
}
.calc-card::before{
  content:"";position:absolute;inset:0;border-radius:var(--radius-lg);
  border:1px solid rgba(255,255,255,.5);pointer-events:none;
}
.calc-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;}
.calc-title h3{font-size:1.15rem;}
.calc-title .seal-tag{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--emerald-700);
  background:rgba(14,140,113,.1);padding:5px 10px;border-radius:100px;text-transform:uppercase;
}
.field{margin-bottom:18px;}
.field label{display:block;font-size:.82rem;font-weight:600;color:var(--ink-700);margin-bottom:7px;}
.input-wrap{position:relative;}
.input-wrap .prefix{
  position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--ink-500);font-family:var(--font-mono);
}
.field input[type="text"],.field input[type="number"],.field select{
  width:100%;padding:13px 14px;border:1.5px solid var(--line);border-radius:var(--radius-sm);
  background:var(--off-white);font-size:1rem;color:var(--ink-900);transition:border-color .18s ease, box-shadow .18s ease;
}
.field input.has-prefix{padding-left:32px;}
.field input:focus,.field select:focus{border-color:var(--blue-600);box-shadow:0 0 0 3px rgba(43,95,173,.15);outline:none;}
.field-error{color:#B3452C;font-size:.78rem;margin-top:6px;display:none;}
.field.invalid input,.field.invalid select{border-color:#B3452C;}
.field.invalid .field-error{display:block;}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.currency-price-row{display:grid;grid-template-columns:92px 1fr;gap:8px;align-items:start;}
.currency-price-row .input-wrap{min-width:0;}
.calc-actions{display:flex;gap:12px;margin-top:8px;}

.calc-results{
  margin-top:24px;border-top:1px dashed var(--line-strong);padding-top:22px;display:none;
}
.calc-results.visible{display:block;}
.result-row{display:flex;justify-content:space-between;align-items:baseline;padding:10px 0;border-bottom:1px solid var(--line);}
.result-row:last-of-type{border-bottom:none;}
.result-row .label{color:var(--ink-500);font-size:.88rem;}
.result-row .value{font-family:var(--font-mono);font-weight:600;font-size:1.05rem;}
.result-hero{
  background:linear-gradient(135deg,var(--navy-900),var(--blue-700));
  color:var(--white);border-radius:var(--radius-md);padding:20px;margin-bottom:16px;
  display:flex;justify-content:space-between;align-items:center;
}
.result-hero .rlabel{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:#B7C2D9;}
.result-hero .ramount{font-family:var(--font-mono);font-size:1.9rem;font-weight:700;}
.band-ladder{margin:16px 0;}
.band-ladder-bar{display:flex;width:100%;height:14px;border-radius:100px;overflow:hidden;background:var(--off-white);border:1px solid var(--line);}
.band-ladder-bar span{height:100%;}
.band-ladder-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px;font-size:.76rem;color:var(--ink-500);}
.band-ladder-legend .dot{width:9px;height:9px;border-radius:2px;display:inline-block;margin-right:5px;}
.result-tools{display:flex;gap:10px;margin-top:18px;}

/* ---------- Cards / Grids ---------- */
.grid{display:grid;gap:24px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}

.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius-md);
  padding:28px;transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:transparent;}
.card .icon{
  width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(14,140,113,.1);color:var(--emerald-700);margin-bottom:16px;
}
.card h3{font-size:1.08rem;margin-bottom:8px;}
.card p{color:var(--ink-500);font-size:.92rem;}

.card--stat{text-align:center;padding:32px 20px;}
.card--stat .num{font-family:var(--font-mono);font-size:2.2rem;font-weight:700;color:var(--emerald-600);}
.card--stat .lbl{color:var(--ink-500);font-size:.85rem;margin-top:6px;}

/* ---------- Timeline (How it Works / Step Guide) ---------- */
.timeline{position:relative;padding-left:40px;}
.timeline::before{content:"";position:absolute;left:13px;top:6px;bottom:6px;width:2px;background:var(--line-strong);}
.timeline-item{position:relative;padding-bottom:40px;}
.timeline-item:last-child{padding-bottom:0;}
.timeline-item::before{
  content:attr(data-step);position:absolute;left:-40px;top:0;width:28px;height:28px;border-radius:50%;
  background:var(--navy-900);color:var(--white);font-family:var(--font-mono);font-size:.72rem;
  display:flex;align-items:center;justify-content:center;font-weight:700;
}
.timeline-item h4{font-size:1.05rem;margin-bottom:6px;}
.timeline-item p{color:var(--ink-500);font-size:.92rem;}

/* ---------- Table ---------- */
.rates-table-wrap{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--line);}
table.rates-table{width:100%;border-collapse:collapse;background:var(--white);min-width:620px;}
table.rates-table th{
  text-align:left;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-500);background:var(--paper);padding:14px 18px;border-bottom:2px solid var(--line-strong);
}
table.rates-table td{padding:14px 18px;border-bottom:1px solid var(--line);font-size:.92rem;}
table.rates-table tr:last-child td{border-bottom:none;}
table.rates-table td.figure{font-family:var(--font-mono);font-weight:600;}

/* ---------- Tabs (buyer/property types could use) ---------- */
.tab-bar{display:flex;gap:8px;margin-bottom:32px;flex-wrap:wrap;}
.tab-btn{padding:10px 18px;border-radius:100px;border:1.5px solid var(--line);font-size:.88rem;font-weight:600;color:var(--ink-500);}
.tab-btn.active{background:var(--navy-900);color:var(--white);border-color:var(--navy-900);}

/* ---------- Checklist ---------- */
.checklist{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.checklist-item{
  display:flex;align-items:center;gap:14px;background:var(--white);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:16px 18px;cursor:pointer;
}
.checklist-item input{width:20px;height:20px;accent-color:var(--emerald-600);}
.checklist-item span{font-size:.94rem;}
.checklist-item.checked{background:rgba(14,140,113,.06);border-color:var(--emerald-600);}
.checklist-item.checked span{text-decoration:line-through;color:var(--ink-500);}
.checklist-progress{margin-top:20px;height:8px;background:var(--line);border-radius:100px;overflow:hidden;}
.checklist-progress-bar{height:100%;background:var(--emerald-600);width:0%;transition:width .3s ease;}

/* ---------- Testimonials ---------- */
.testimonial-slider{position:relative;max-width:760px;margin:0 auto;text-align:center;}
.testimonial-slide{display:none;}
.testimonial-slide.active{display:block;animation:fadeUp .5s ease;}
.testimonial-slide p{font-family:var(--font-display);font-size:1.3rem;color:var(--white);line-height:1.5;margin-bottom:22px;}
.testimonial-author{display:flex;flex-direction:column;align-items:center;gap:2px;}
.testimonial-author strong{color:var(--white);}
.testimonial-author span{color:#8FA0C4;font-size:.85rem;}
.slider-dots{display:flex;justify-content:center;gap:8px;margin-top:32px;}
.slider-dots button{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.25);}
.slider-dots button.active{background:var(--emerald-400);width:22px;border-radius:100px;}

/* ---------- FAQ ---------- */
.faq-search{max-width:420px;margin:0 auto 40px;position:relative;}
.faq-search input{width:100%;padding:14px 18px 14px 44px;border-radius:100px;border:1.5px solid var(--line);background:var(--white);}
.faq-search svg{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--ink-500);}
.faq-columns{column-count:2;column-gap:28px;}
.faq-item{break-inside:avoid;background:var(--white);border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:14px;overflow:hidden;}
.faq-q{
  display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;cursor:pointer;font-weight:600;font-size:.94rem;
}
.faq-q .chev{transition:transform .25s ease;flex-shrink:0;color:var(--emerald-600);}
.faq-item.open .chev{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-a p{padding:0 20px 18px;color:var(--ink-500);font-size:.9rem;}
.faq-item.hidden{display:none;}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;}
.contact-form .field{margin-bottom:18px;}
.office-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-md);padding:22px;margin-bottom:16px;}
.office-card h4{font-size:.98rem;margin-bottom:6px;}
.office-card p{color:var(--ink-500);font-size:.88rem;}

/* ---------- CTA Banner ---------- */
.cta-banner{
  background:linear-gradient(120deg,var(--emerald-700),var(--blue-700));
  border-radius:var(--radius-lg);padding:64px 48px;text-align:center;color:var(--white);
  position:relative;overflow:hidden;
}
.cta-banner h2{color:var(--white);font-size:clamp(1.6rem,3vw,2.3rem);margin-bottom:14px;}
.cta-banner p{color:rgba(255,255,255,.85);margin-bottom:28px;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-950);color:#B7C2D9;padding:80px 0 28px;}
.footer-top{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:36px;padding-bottom:56px;border-bottom:1px solid rgba(255,255,255,.08);}
.footer-brand p{color:#8FA0C4;font-size:.88rem;margin-top:14px;max-width:280px;}
.footer-col h5{color:var(--white);font-size:.82rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:18px;}
.footer-col a{display:block;color:#A9B6D0;font-size:.9rem;padding:6px 0;}
.footer-col a:hover{color:var(--emerald-400);}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;flex-wrap:wrap;gap:16px;font-size:.82rem;color:#7C8CB0;}
.social-icons{display:flex;gap:12px;}
.social-icons a{width:36px;height:36px;border-radius:50%;border:1px solid rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center;}
.social-icons a:hover{background:rgba(255,255,255,.08);}

/* ---------- Back to top ---------- */
.back-to-top{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;
  background:var(--navy-900);color:var(--white);display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-md);opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .25s ease,transform .25s ease;z-index:900;
}
.back-to-top.visible{opacity:1;pointer-events:auto;transform:translateY(0);}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:30px;transform:translate(-50%,20px);background:var(--navy-900);color:#fff;
  padding:13px 22px;border-radius:100px;font-size:.88rem;box-shadow:var(--shadow-md);opacity:0;
  pointer-events:none;transition:opacity .25s ease,transform .25s ease;z-index:1200;
}
.toast.visible{opacity:1;transform:translate(-50%,0);}

/* ---------- Misc ---------- */
.badge-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px;}
.badge{
  font-family:var(--font-mono);font-size:.72rem;padding:6px 12px;border-radius:100px;
  background:rgba(255,255,255,.08);color:#D7DEEC;border:1px solid rgba(255,255,255,.14);
}
.divider-line{height:1px;background:var(--line);margin:64px 0;}
.tools-strip a{color:var(--blue-700);font-weight:600;}
.skip-link{position:absolute;left:-999px;top:0;background:var(--emerald-600);color:#fff;padding:12px 18px;z-index:2000;}
.skip-link:focus{left:12px;top:12px;}