/* =========================================================
   Carbon Footprint Calculator for Flights — style.css
   SEOWebChecker.com
   ========================================================= */

:root{
  --navy-950:#0B1B2B;
  --navy-900:#122439;
  --navy-800:#173049;
  --sky-600:#1E6FA8;
  --sky-400:#63B4E8;
  --contrail:#F2984B;
  --contrail-dark:#D97B2E;
  --cloud:#F6F9FC;
  --slate-900:#16232D;
  --slate-600:#4B5C68;
  --slate-300:#C7D3DA;
  --green-600:#2E8B57;
  --red-600:#C0392B;

  --bg:#F6F9FC;
  --surface:#FFFFFF;
  --surface-2:#EEF3F7;
  --text:#16232D;
  --text-muted:#4B5C68;
  --border:#DCE4EA;
  --accent:var(--sky-600);
  --accent-2:var(--contrail);
  --shadow: 0 8px 30px rgba(11,27,43,0.08);
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:22px;

  --font-display:'Outfit', sans-serif;
  --font-body:'Inter', sans-serif;
}

[data-theme="dark"]{
  --bg:var(--navy-950);
  --surface:var(--navy-900);
  --surface-2:var(--navy-800);
  --text:#E8F1F8;
  --text-muted:#9FB3C2;
  --border:#243A50;
  --accent:var(--sky-400);
  --accent-2:var(--contrail);
  --shadow: 0 8px 30px rgba(0,0,0,0.35);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--text);
  transition:background .35s ease, color .35s ease;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 .5em;line-height:1.15;letter-spacing:-0.01em;}
p{line-height:1.7;color:var(--text-muted);margin:0 0 1em;}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px;}
section{padding:72px 0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-display);font-size:.78rem;font-weight:600;
  text-transform:uppercase;letter-spacing:.12em;color:var(--accent-2);
  margin-bottom:14px;
}
.section-head{max-width:680px;margin:0 auto 42px;text-align:center;}
.section-head h2{font-size:clamp(1.6rem,3.4vw,2.35rem);}
.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:1px solid transparent;
  cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,opacity .18s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--accent-2);color:#1A1200;box-shadow:0 6px 18px rgba(242,152,74,.35);}
.btn-primary:hover{box-shadow:0 10px 26px rgba(242,152,74,.45);}
.btn-outline{background:transparent;border-color:var(--border);color:var(--text);}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);}
.btn-ghost{background:var(--surface-2);color:var(--text);}
.btn:disabled{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none;}
.skip-link{position:absolute;left:-999px;top:0;background:var(--accent-2);color:#1A1200;padding:10px 16px;border-radius:0 0 8px 0;z-index:200;}
.skip-link:focus{left:0;}

/* ============ Cookie banner ============ */
#cookieBanner{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:1000;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);
  box-shadow:var(--shadow);padding:18px 22px;max-width:760px;margin:0 auto;
  display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;
  transform:translateY(140%);opacity:0;transition:transform .4s ease, opacity .4s ease;
}
#cookieBanner.show{transform:translateY(0);opacity:1;}
#cookieBanner p{margin:0;font-size:.88rem;color:var(--text-muted);flex:1 1 320px;}
#cookieBanner .cookie-actions{display:flex;gap:10px;flex-wrap:wrap;}

/* ============ Header ============ */
header.site-header{
  position:sticky;top:0;z-index:500;background:var(--surface);
  border-bottom:1px solid var(--border);
}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 0;gap:16px;}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:1.18rem;}
.logo svg{flex:none;}
.logo span.brand-check{color:var(--accent);}
nav.main-nav{display:flex;align-items:center;gap:6px;}
.main-nav ul{list-style:none;display:flex;gap:2px;margin:0;padding:0;align-items:center;}
.main-nav > ul > li{position:relative;}
.main-nav a.nav-link{
  display:flex;align-items:center;gap:5px;padding:10px 14px;border-radius:8px;
  font-size:.92rem;font-weight:500;color:var(--text);white-space:nowrap;
}
.main-nav a.nav-link:hover{background:var(--surface-2);color:var(--accent);}
.has-mega{position:relative;}
.mega-panel{
  position:absolute;top:100%;left:50%;transform:translateX(-50%);
  min-width:640px;max-width:720px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-md);box-shadow:var(--shadow);padding:22px;
  display:none;grid-template-columns:repeat(2,1fr);gap:6px 24px;z-index:600;
}
.has-mega.open .mega-panel{display:grid;}
.mega-panel a{display:block;padding:9px 10px;border-radius:8px;font-size:.88rem;color:var(--text-muted);}
.mega-panel a:hover{background:var(--surface-2);color:var(--accent);}
.mega-col-title{font-family:var(--font-display);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent-2);padding:8px 10px 4px;font-weight:700;}
.header-actions{display:flex;align-items:center;gap:10px;}
.theme-toggle{
  width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:var(--surface-2);
  display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text);
}
.theme-toggle svg{width:19px;height:19px;}
.hamburger{display:none;width:44px;height:44px;border-radius:8px;border:1px solid var(--border);background:var(--surface-2);cursor:pointer;align-items:center;justify-content:center;}
.hamburger span,.hamburger span::before,.hamburger span::after{
  content:'';display:block;width:20px;height:2px;background:var(--text);position:relative;transition:.25s;
}
.hamburger span::before{position:absolute;top:-6px;}
.hamburger span::after{position:absolute;top:6px;}

/* breadcrumb */
.breadcrumb-bar{background:var(--surface-2);border-bottom:1px solid var(--border);}
.breadcrumb{display:flex;flex-wrap:wrap;gap:6px;align-items:center;padding:10px 0;font-size:.82rem;color:var(--text-muted);}
.breadcrumb a{color:var(--text-muted);}
.breadcrumb a:hover{color:var(--accent);}
.breadcrumb .sep{opacity:.5;}
.breadcrumb .current{color:var(--text);font-weight:600;}

/* ============ Hero ============ */
.hero{position:relative;padding:64px 0 40px;overflow:hidden;}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;}
.hero h1{font-size:clamp(2rem,4.4vw,3.1rem);}
.hero .lead{font-size:1.08rem;max-width:520px;}
.hero-stats{display:flex;gap:26px;margin-top:26px;flex-wrap:wrap;}
.hero-stats div{min-width:120px;}
.hero-stats .num{font-family:var(--font-display);font-size:1.5rem;font-weight:700;color:var(--accent);}
.hero-stats .lbl{font-size:.78rem;color:var(--text-muted);}
.hero-cta{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap;}
.hero-visual{position:relative;height:340px;}
.flight-svg{width:100%;height:100%;}
.route-path{fill:none;stroke:var(--slate-300);stroke-width:2;stroke-dasharray:6 8;}
.route-progress{fill:none;stroke:var(--accent-2);stroke-width:3;stroke-dasharray:600;stroke-dashoffset:600;animation:drawRoute 3.2s ease-in-out infinite;}
.plane-icon{transform-origin:center;animation:flyRoute 3.2s ease-in-out infinite;}
@keyframes drawRoute{0%{stroke-dashoffset:600;}60%{stroke-dashoffset:0;}100%{stroke-dashoffset:0;opacity:0;}}
@keyframes flyRoute{0%{offset-distance:0%;opacity:1;}60%{offset-distance:100%;}100%{offset-distance:100%;opacity:0;}}
@media (prefers-reduced-motion: reduce){
  .route-progress,.plane-icon{animation:none !important;}
}

/* ============ Ref calculators strip ============ */
.ref-calcs{background:var(--surface-2);border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.ref-calcs .section-head{margin-bottom:26px;}
.ref-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px;}
.ref-grid a{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:12px 14px;font-size:.85rem;color:var(--text-muted);
}
.ref-grid a:hover{border-color:var(--accent);color:var(--accent);}

/* ============ Feature cards ============ */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px;}
.feature-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:26px;transition:transform .2s ease, box-shadow .2s ease;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.feature-icon{
  width:46px;height:46px;border-radius:12px;background:var(--surface-2);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.feature-card h3{font-size:1.06rem;}
.feature-card p{font-size:.9rem;margin:0;}

/* ============ How it works ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step;}
.step{position:relative;padding:26px 20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);}
.step::before{counter-increment:step;content:counter(step);font-family:var(--font-display);font-weight:700;font-size:1.6rem;color:var(--accent-2);opacity:.5;}
.step h4{margin-top:10px;font-size:1rem;}
.step p{font-size:.86rem;margin:0;}

/* ============ Calculator ============ */
.calc-section{background:var(--surface-2);}
.calc-wrapper{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden;}
.calc-tabs{display:flex;border-bottom:1px solid var(--border);}
.calc-tab{flex:1;padding:16px;text-align:center;font-family:var(--font-display);font-weight:600;font-size:.92rem;cursor:pointer;color:var(--text-muted);background:var(--surface-2);border:none;}
.calc-tab.active{background:var(--surface);color:var(--accent);}
.calc-body{padding:32px;}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.form-group{position:relative;display:flex;flex-direction:column;gap:6px;}
.form-group.full{grid-column:1 / -1;}
.form-group label{font-size:.83rem;font-weight:600;color:var(--text);}
.form-group input, .form-group select{
  padding:13px 14px;border-radius:var(--radius-sm);border:1px solid var(--border);
  background:var(--bg);color:var(--text);font-size:.95rem;font-family:var(--font-body);
  transition:border-color .18s ease, box-shadow .18s ease;
}
.form-group input:focus, .form-group select:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(30,111,168,.18);
}
.form-group .hint{font-size:.76rem;color:var(--text-muted);}
.form-group .error-msg{font-size:.78rem;color:var(--red-600);min-height:16px;}
.form-group.invalid input, .form-group.invalid select{border-color:var(--red-600);}
.form-group.valid input, .form-group.valid select{border-color:var(--green-600);}
.autocomplete-list{
  position:absolute;top:100%;left:0;right:0;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);max-height:220px;overflow-y:auto;z-index:50;box-shadow:var(--shadow);display:none;
}
.autocomplete-list.show{display:block;}
.autocomplete-list div{padding:10px 14px;font-size:.86rem;cursor:pointer;border-bottom:1px solid var(--border);}
.autocomplete-list div:last-child{border-bottom:none;}
.autocomplete-list div:hover, .autocomplete-list div.active{background:var(--surface-2);color:var(--accent);}
.swap-btn{
  align-self:center;justify-self:center;width:38px;height:38px;border-radius:50%;border:1px solid var(--border);
  background:var(--surface-2);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--accent);
  grid-column:1/-1;margin:-4px auto;
}
.radio-row{display:flex;gap:10px;flex-wrap:wrap;}
.radio-pill{
  border:1px solid var(--border);border-radius:999px;padding:9px 16px;font-size:.85rem;cursor:pointer;
  background:var(--bg);color:var(--text-muted);
}
.radio-pill input{display:none;}
.radio-pill.checked{background:var(--accent);color:#fff;border-color:var(--accent);}
.calc-footer-row{display:flex;justify-content:space-between;align-items:center;margin-top:26px;flex-wrap:wrap;gap:14px;}
.trip-toggle{display:flex;align-items:center;gap:10px;font-size:.88rem;color:var(--text-muted);}
.switch{position:relative;width:44px;height:24px;}
.switch input{opacity:0;width:0;height:0;}
.slider-toggle{position:absolute;inset:0;background:var(--border);border-radius:999px;cursor:pointer;transition:.2s;}
.slider-toggle::before{content:'';position:absolute;height:18px;width:18px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s;}
.switch input:checked + .slider-toggle{background:var(--accent);}
.switch input:checked + .slider-toggle::before{transform:translateX(20px);}

/* ============ Results ============ */
#resultSection{scroll-margin-top:90px;}
.result-hidden{display:none;}
.result-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow);padding:34px;
}
.result-top{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:20px;margin-bottom:24px;}
.result-headline .co2-number{font-family:var(--font-display);font-size:3rem;font-weight:800;color:var(--accent-2);line-height:1;}
.result-headline .co2-unit{font-size:1rem;color:var(--text-muted);font-weight:500;}
.result-badges{display:flex;gap:10px;flex-wrap:wrap;}
.badge{padding:7px 14px;border-radius:999px;font-size:.78rem;font-weight:600;background:var(--surface-2);border:1px solid var(--border);}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:26px;}
.metric-box{background:var(--surface-2);border-radius:var(--radius-md);padding:16px 18px;}
.metric-box .m-label{font-size:.76rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;}
.metric-box .m-value{font-family:var(--font-display);font-size:1.3rem;font-weight:700;margin-top:4px;}
.bar-chart{margin:26px 0;}
.bar-row{display:grid;grid-template-columns:120px 1fr 70px;align-items:center;gap:12px;margin-bottom:10px;font-size:.84rem;}
.bar-track{height:14px;background:var(--surface-2);border-radius:999px;overflow:hidden;}
.bar-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--accent-2));width:0;transition:width 1s ease;}
.equivalents{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:20px 0;}
.equiv-card{text-align:center;padding:18px 12px;background:var(--surface-2);border-radius:var(--radius-md);}
.equiv-card .eq-icon{font-size:1.6rem;}
.equiv-card .eq-value{font-family:var(--font-display);font-weight:700;font-size:1.05rem;margin-top:6px;}
.equiv-card .eq-label{font-size:.76rem;color:var(--text-muted);}
.result-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);}
.offset-note{background:var(--surface-2);border-left:3px solid var(--accent-2);padding:14px 18px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:.86rem;margin-top:22px;}

/* share & feedback row */
.post-actions{display:flex;justify-content:center;gap:16px;margin-top:20px;flex-wrap:wrap;}

/* ============ Sample routes table ============ */
.table-scroll{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow);}
.routes-table{width:100%;border-collapse:collapse;min-width:640px;}
.routes-table thead th{
  text-align:left;font-family:var(--font-display);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;
  color:var(--text-muted);padding:16px 20px;border-bottom:1px solid var(--border);background:var(--surface-2);white-space:nowrap;
}
.routes-table tbody td{padding:15px 20px;font-size:.9rem;border-bottom:1px solid var(--border);white-space:nowrap;}
.routes-table tbody tr:last-child td{border-bottom:none;}
.routes-table tbody tr:hover{background:var(--surface-2);}
.routes-table tbody td:first-child{font-weight:600;}
.routes-table tbody td:nth-child(5){color:var(--accent-2);font-weight:700;font-family:var(--font-display);}
.t-tonnes{color:var(--text-muted);font-weight:500;font-family:var(--font-body);font-size:.82rem;}
.table-note{max-width:820px;margin:18px auto 0;text-align:center;font-size:.85rem;}
.table-note a{color:var(--accent);font-weight:600;}
@media (max-width:600px){
  .routes-table{min-width:560px;}
}

/* ============ FAQ ============ */
.faq-list{max-width:800px;margin:0 auto;}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;background:var(--surface);}
.faq-q{width:100%;text-align:left;padding:18px 20px;background:none;border:none;font-family:var(--font-display);font-weight:600;font-size:.98rem;color:var(--text);display:flex;justify-content:space-between;align-items:center;cursor:pointer;gap:10px;}
.faq-q .plus{transition:transform .25s ease;font-size:1.2rem;color:var(--accent);}
.faq-item.open .plus{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-a p{padding:0 20px 18px;margin:0;font-size:.9rem;}

/* ============ Article ============ */
.article-block{max-width:820px;margin:0 auto;}
.article-block h2{font-size:1.6rem;}
.article-block p{font-size:.98rem;}

/* ============ CTA ============ */
.cta-section{
  background:linear-gradient(135deg,var(--navy-950),var(--sky-600));
  border-radius:var(--radius-lg);color:#fff;text-align:center;padding:56px 32px;margin:0 20px;
}
.cta-section h2{color:#fff;}
.cta-section p{color:rgba(255,255,255,.82);max-width:560px;margin:0 auto 26px;}
.cta-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;}
.cta-section .btn-outline{border-color:rgba(255,255,255,.4);color:#fff;}
.cta-section .btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.1);}

/* ============ Footer ============ */
footer.site-footer{background:var(--navy-950);color:#C7D3DA;padding:56px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:1.3fr repeat(4,1fr);gap:28px;}
.footer-col h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px;}
.footer-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px;}
.footer-col a{font-size:.84rem;color:#9FB3C2;}
.footer-col a:hover{color:#fff;}
.footer-brand p{font-size:.85rem;color:#9FB3C2;max-width:280px;}
.footer-bottom{border-top:1px solid #23364A;margin-top:36px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.8rem;color:#7D93A5;}
.footer-legal{display:flex;gap:16px;flex-wrap:wrap;}
.disclaimer-box{font-size:.78rem;color:#7D93A5;max-width:1180px;margin:0 auto 24px;padding:0 20px;}

/* ============ Toast ============ */
#toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120%);
  background:var(--navy-950);color:#fff;padding:12px 22px;border-radius:999px;font-size:.86rem;
  z-index:1000;transition:transform .3s ease;box-shadow:var(--shadow);
}
#toast.show{transform:translateX(-50%) translateY(0);}

/* ============ Loader ============ */
.spinner{width:16px;height:16px;border-radius:50%;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;animation:spin .7s linear infinite;display:none;}
.btn.loading .spinner{display:inline-block;}
.btn.loading .btn-text{opacity:.7;}
@keyframes spin{to{transform:rotate(360deg);}}

/* ============ Responsive ============ */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;}
  .hero-visual{height:220px;order:-1;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .steps{grid-template-columns:1fr 1fr;}
}
@media (max-width:760px){
  .main-nav{display:none;}
  .hamburger{display:flex;}
  .form-grid{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  section{padding:52px 0;}
  .mega-panel{position:static;transform:none;min-width:0;max-width:none;width:100%;grid-template-columns:1fr;box-shadow:none;}
  body.nav-open .main-nav{
    display:block;position:fixed;inset:0;top:112px;background:var(--surface);z-index:400;
    overflow-y:auto;padding:16px;
  }
  body.nav-open .main-nav > ul{flex-direction:column;align-items:stretch;}
  .has-mega .mega-panel{display:none;}
  .has-mega.open .mega-panel{display:block;}
}
@media (max-width:480px){
  .footer-grid{grid-template-columns:1fr;}
  .result-headline .co2-number{font-size:2.2rem;}
  .container{padding:0 16px;}
}

/* prevent horizontal scroll globally */
html,body{max-width:100%;}