/* ===================================================================
   Carbon Footprint Plastic Calculator — design tokens & layout
=================================================================== */
:root{
  --bg:#EEF1E9;
  --bg-alt:#E3E8DB;
  --surface:#FFFFFF;
  --ink:#16211A;
  --ink-soft:#4A574C;
  --line:#CBD4C1;
  --teal:#0F6E5C;
  --teal-deep:#0A4F42;
  --teal-tint:#DCEDE7;
  --amber:#DE9F35;
  --coral:#DD6449;
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:22px;
  --shadow:0 12px 32px -16px rgba(15,30,20,0.28);
  --font-display:'Outfit',sans-serif;
  --font-body:'Inter',sans-serif;
  color-scheme: light;
}
:root[data-theme="dark"]{
  --bg:#0D1512;
  --bg-alt:#141F19;
  --surface:#182420;
  --ink:#E9F1E6;
  --ink-soft:#A7BAA9;
  --line:#26362C;
  --teal:#39CBA6;
  --teal-deep:#7FE0C2;
  --teal-tint:#17332C;
  --amber:#EFB559;
  --coral:#F0806A;
  --shadow:0 16px 40px -18px rgba(0,0,0,0.6);
  color-scheme: dark;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  overflow-x:hidden;
  transition:background .25s ease,color .25s ease;
}
img{max-width:100%;display:block;}
a{color:inherit;}
h1,h2,h3{font-family:var(--font-display);margin:0 0 .5em;line-height:1.15;color:var(--ink);}
p{margin:0 0 1em;color:var(--ink-soft);}
.skip-link{position:absolute;left:-999px;top:0;background:var(--teal);color:#fff;padding:.6em 1em;z-index:999;border-radius:0 0 8px 0;}
.skip-link:focus{left:0;}
:focus-visible{outline:2.5px solid var(--teal);outline-offset:2px;}

.section-inner{max-width:1180px;margin:0 auto;padding:0 24px;}
.section-inner.narrow{max-width:820px;}
.eyebrow{font-family:var(--font-display);font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:.78rem;color:var(--teal);margin:0 0 .6em;}
.eyebrow.center{text-align:center;}
.section-title{font-size:clamp(1.6rem,3vw,2.3rem);}
.section-title.center{text-align:center;}
.section-sub.center{text-align:center;max-width:560px;margin:0 auto 2.4em;}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--font-display);font-weight:600;font-size:.95rem;
  padding:.85em 1.5em;border-radius:999px;border:1.5px solid transparent;
  cursor:pointer;text-decoration:none;transition:transform .15s ease,box-shadow .15s ease,background .2s ease,opacity .2s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--teal);color:#fff;}
.btn-primary:hover{background:var(--teal-deep);box-shadow:0 8px 20px -8px var(--teal);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line);}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal);}
.btn-ghost-invert{background:transparent;color:#fff;border-color:rgba(255,255,255,.5);}
.btn-ghost-invert:hover{border-color:#fff;}
.btn-secondary{background:var(--teal-tint);color:var(--teal-deep);}
.btn-secondary:hover{background:var(--teal);color:#fff;}
.btn-lg{padding:1em 2em;font-size:1.02rem;width:100%;}
.btn[disabled]{opacity:.6;cursor:not-allowed;transform:none;}
.btn-spinner{display:none;width:16px;height:16px;border-radius:50%;border:2.5px solid rgba(255,255,255,.4);border-top-color:#fff;animation:spin .7s linear infinite;}
.btn[disabled] .btn-spinner{display:inline-block;}
@keyframes spin{to{transform:rotate(360deg);}}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb, var(--bg) 92%, transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.header-inner{max-width:1180px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:24px;}
.brand{display:flex;align-items:center;gap:.5em;text-decoration:none;color:var(--ink);margin-right:auto;}
.brand-mark{color:var(--teal);display:flex;}
.brand-text{font-family:var(--font-display);font-weight:700;font-size:1.15rem;}
.brand-dot{color:var(--teal);font-weight:500;}

.main-nav ul{list-style:none;display:flex;gap:6px;margin:0;padding:0;}
.nav-top{
  font-family:var(--font-body);font-weight:500;font-size:.94rem;color:var(--ink);
  background:none;border:none;cursor:pointer;padding:.6em .9em;border-radius:999px;
  text-decoration:none;display:inline-block;
}
.nav-top:hover{background:var(--bg-alt);}
.has-mega{position:relative;}
.mega{
  position:absolute; top:100%; left:0; margin-top:8px;
  display:none; grid-template-columns:repeat(2,200px); gap:4px 28px;
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-md);
  padding:18px 22px; box-shadow:var(--shadow); z-index:50;
}
.has-mega:hover .mega,
.has-mega:focus-within .mega,
.has-mega.open .mega{display:grid;}
.mega a{display:block;padding:.5em 0;font-size:.92rem;color:var(--ink-soft);text-decoration:none;border-bottom:1px solid transparent;}
.mega a:hover{color:var(--teal);}
.mega a.active-link{color:var(--teal);font-weight:600;}

.header-actions{display:flex;align-items:center;gap:8px;}
.icon-btn{background:var(--bg-alt);border:1px solid var(--line);width:38px;height:38px;border-radius:999px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink);}
.icon-sun{display:none;} :root[data-theme="dark"] .icon-sun{display:block;} :root[data-theme="dark"] .icon-moon{display:none;}
.hamburger{display:none;background:none;border:none;width:38px;height:38px;flex-direction:column;justify-content:center;align-items:center;gap:5px;cursor:pointer;}
.hamburger span{width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s ease,opacity .25s ease;}
.hamburger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.hamburger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.mobile-drawer{display:none;}

/* ===== Breadcrumb ===== */
.breadcrumb{max-width:1180px;margin:0 auto;padding:16px 24px 0;}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:.84rem;color:var(--ink-soft);}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:6px;color:var(--line);}
.breadcrumb a{text-decoration:none;color:var(--ink-soft);}
.breadcrumb a:hover{color:var(--teal);}
.breadcrumb li[aria-current]{color:var(--ink);font-weight:500;}

/* ===== Hero ===== */
.hero{padding:56px 0 40px;}
.hero-inner{max-width:1180px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
.hero-sub{max-width:520px;font-size:1.05rem;}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px;}
.stream-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow);}
.stream-label{font-size:.82rem;color:var(--ink-soft);margin-bottom:.4em;}
.stream-number{font-family:var(--font-display);font-weight:700;font-size:2.4rem;color:var(--teal-deep);margin:0;font-variant-numeric:tabular-nums;}
:root[data-theme="dark"] .stream-number{color:var(--teal);}
.stream-unit{font-size:1rem;font-weight:500;color:var(--ink-soft);}
.stream-note{font-size:.76rem;color:var(--ink-soft);margin-top:.6em;}
.stream-bars{display:flex;align-items:flex-end;gap:6px;height:70px;margin-top:16px;}
.stream-bars span{flex:1;background:linear-gradient(180deg,var(--teal),var(--teal-tint));height:var(--h);border-radius:4px 4px 0 0;animation:rise 1.4s ease;}
@keyframes rise{from{transform:scaleY(0);transform-origin:bottom;}to{transform:scaleY(1);}}

/* ===== Reference links ===== */
.ref-links{padding:16px 0 48px;}
.ref-title{font-size:1rem;font-family:var(--font-display);font-weight:600;margin-bottom:1em;color:var(--ink-soft);}
.ref-grid{display:flex;flex-wrap:wrap;gap:8px;}
.ref-grid a{font-size:.82rem;background:var(--bg-alt);border:1px solid var(--line);color:var(--ink-soft);padding:.5em .9em;border-radius:999px;text-decoration:none;}
.ref-grid a:hover{color:var(--teal);border-color:var(--teal);}

/* ===== Features ===== */
.features{padding:56px 0;background:var(--bg-alt);}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px;}
.feature-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:24px;}
.feature-card svg{color:var(--teal);margin-bottom:12px;}
.feature-card h3{font-size:1.05rem;margin-bottom:.4em;}
.feature-card p{font-size:.9rem;margin:0;}

/* ===== Calculator ===== */
.calculator-section{padding:64px 0;}
.calc-form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow);}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px 24px;}
.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:.86rem;font-weight:600;font-family:var(--font-display);}
.field input,.field select{
  font-family:var(--font-body);font-size:.95rem;padding:.75em .9em;
  border-radius:var(--radius-sm);border:1.5px solid var(--line);background:var(--bg);color:var(--ink);
  width:100%;
}
.field input:focus,.field select:focus{border-color:var(--teal);}
.field input[aria-invalid="true"],.field select[aria-invalid="true"]{border-color:var(--coral);}
.input-with-unit{display:flex;gap:8px;}
.input-with-unit input{flex:1.4;min-width:0;}
.input-with-unit select{flex:1;min-width:0;}
.field-error{font-size:.78rem;color:var(--coral);min-height:1.1em;margin:0;}
.form-actions{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap;}
.form-actions .btn-lg{flex:1 1 240px;}
.form-note{font-size:.78rem;color:var(--ink-soft);margin:16px 0 0;text-align:center;}

/* ===== Results ===== */
.results-section{padding:16px 0 64px;}
.result-headline{text-align:center;background:var(--teal-tint);border-radius:var(--radius-lg);padding:36px 24px;margin-bottom:28px;}
.result-total{font-family:var(--font-display);font-weight:800;font-size:clamp(2.2rem,6vw,3.4rem);color:var(--teal-deep);margin:0;}
:root[data-theme="dark"] .result-total{color:var(--teal);}
.result-unit{font-size:1.1rem;font-weight:500;margin-left:.2em;color:var(--ink-soft);}
.result-context{max-width:520px;margin:.6em auto 0;}
.impact-meter{height:10px;border-radius:999px;background:var(--bg);overflow:hidden;max-width:420px;margin:18px auto 0;border:1px solid var(--line);}
.impact-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--teal),var(--amber),var(--coral));transition:width .6s ease;}
.impact-caption{font-size:.8rem;margin:.6em 0 0;}

.breakdown-table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden;}
.breakdown-table caption{text-align:left;font-family:var(--font-display);font-weight:600;padding:14px 18px;background:var(--bg-alt);caption-side:top;}
.breakdown-table th,.breakdown-table td{padding:12px 18px;text-align:left;border-top:1px solid var(--line);font-size:.92rem;}
.breakdown-table tfoot td{font-weight:700;border-top:2px solid var(--line);}

.result-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px;}
.copy-confirm{font-size:.82rem;color:var(--teal);min-height:1.2em;margin-top:8px;}

/* ===== How it works ===== */
.how-it-works{padding:60px 0;background:var(--bg-alt);}
.steps-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
.step-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:20px;}
.step-index{display:inline-block;font-family:var(--font-display);font-weight:700;color:var(--teal);font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;margin-bottom:.6em;}
.step-card p{font-size:.86rem;margin:0;}

/* ===== Article ===== */
.article{padding:60px 0;}
.article h2{font-size:1.5rem;}
.article p{font-size:.98rem;}

/* ===== FAQ ===== */
.faq{padding:60px 0;background:var(--bg-alt);}
.faq-list{display:flex;flex-direction:column;gap:10px;}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:16px 20px;}
.faq-item summary{cursor:pointer;font-family:var(--font-display);font-weight:600;font-size:.98rem;list-style:none;display:flex;justify-content:space-between;align-items:center;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.3rem;color:var(--teal);}
.faq-item[open] summary::after{content:"–";}
.faq-item p{margin:.8em 0 0;font-size:.92rem;}

/* ===== CTA ===== */
.cta{padding:60px 0;background:var(--teal-deep);color:#fff;}
.cta-inner{text-align:center;}
.cta h2{color:#fff;}
.cta p{color:rgba(255,255,255,.85);max-width:520px;margin:0 auto 1.6em;}
.cta-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;}
.cta .btn-primary{background:#fff;color:var(--teal-deep);}
.cta .btn-primary:hover{background:var(--teal-tint);}

/* ===== Footer ===== */
.site-footer{padding:56px 0 0;background:var(--bg-alt);border-top:1px solid var(--line);}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:28px;padding-bottom:36px;}
.footer-col h3{font-size:.86rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-soft);margin-bottom:.9em;}
.footer-col a,.footer-brand p{display:block;font-size:.86rem;color:var(--ink-soft);text-decoration:none;margin-bottom:.6em;}
.footer-col a:hover{color:var(--teal);}
.footer-legal{border-top:1px solid var(--line);padding:22px 24px 28px;}
.footer-legal-links{display:flex;gap:16px;flex-wrap:wrap;font-size:.84rem;margin-bottom:14px;}
.footer-legal-links a{text-decoration:none;color:var(--ink-soft);}
.footer-legal-links a:hover{color:var(--teal);}
.disclaimer{font-size:.76rem;color:var(--ink-soft);max-width:900px;}
.copyright{font-size:.8rem;color:var(--ink-soft);}

/* ===== Cookie banner ===== */
.cookie-banner{
  position:fixed;left:16px;right:16px;bottom:16px;max-width:560px;margin:0 auto;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);
  box-shadow:var(--shadow);padding:18px 20px;z-index:200;display:flex;flex-direction:column;gap:14px;
}
.cookie-banner p{margin:0;font-size:.86rem;}
.cookie-banner a{color:var(--teal);text-decoration:underline;}
.cookie-actions{display:flex;gap:10px;justify-content:flex-end;}

/* ===== Responsive ===== */
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;}
  .form-grid{grid-template-columns:1fr;}
  .feature-grid{grid-template-columns:1fr 1fr;}
  .steps-grid{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:760px){
  .main-nav{display:none;}
  .hamburger{display:flex;}
  .mobile-drawer{
    display:flex; flex-direction:column; gap:22px;
    max-height:0; overflow:hidden; opacity:0;
    padding:0 20px; background:var(--surface); border-top:0 solid var(--line);
    transition:max-height .3s ease, opacity .25s ease, padding .3s ease;
  }
  .mobile-drawer.open{max-height:80vh; overflow-y:auto; opacity:1; padding:20px; border-top:1px solid var(--line);}
  .drawer-label{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-soft);margin:0 0 8px;}
  .drawer-group a{display:block;padding:.5em 0;text-decoration:none;color:var(--ink);font-size:.94rem;}
  .feature-grid{grid-template-columns:1fr;}
  .steps-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .header-inner{padding:12px 16px;}
  .section-inner{padding:0 16px;}
  .calc-form{padding:22px;}
  .result-actions .btn{flex:1 1 auto;}
}
@media (max-width:480px){
  .footer-grid{grid-template-columns:1fr;}
  .stream-number{font-size:1.9rem;}
  .cookie-banner{left:10px;right:10px;bottom:10px;}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important;}
}