:root {
  --charcoal: #2B2B2B;
  --sun: #F28C28;
  --sun-dark: #D9741A;
  --panel: #2B4A6B;
  --panel-dark: #1F3853;
  --mist: #EEF2F6;
  --line: #D5DDE5;
  --muted: #5A6470;
  --sand: #E9E0CF;
  --white: #FFFFFF;
  --head: "Montserrat", "Segoe UI", Arial, sans-serif;
  --body: "Source Sans 3", "Segoe UI", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--body); font-size: 17px; line-height: 1.6; color: var(--charcoal); background: var(--white); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--panel); }
a:hover { color: var(--panel-dark); }
h1, h2, h3 { font-family: var(--head); line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 700; }
h3 { font-size: 1.1rem; font-weight: 600; }
p { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 2px; }

.wrap { width: min(1160px, 100% - 2.5rem); margin-inline: auto; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--charcoal); color: var(--white); padding: .5rem 1rem; z-index: 50; }
.skip-link:focus { left: 1rem; }
.hide-sm { display: inline; }

.test-banner { background: var(--sun); color: var(--charcoal); text-align: center; font-weight: 600; padding: .4rem 1rem; font-size: .95rem; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, .96); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; gap: 1.5rem; min-height: 76px; }
.brand img { width: 235px; height: auto; }
.main-nav { display: flex; gap: 1.5rem; margin-left: auto; }
.main-nav a { color: var(--charcoal); text-decoration: none; font-weight: 600; }
.main-nav a:hover { color: var(--panel); text-decoration: underline; text-underline-offset: 4px; }
.cart-btn { display: inline-flex; align-items: center; gap: .45rem; border: 2px solid var(--charcoal); background: var(--white); color: var(--charcoal); border-radius: 999px; padding: .45rem .9rem; font: 600 1rem var(--body); cursor: pointer; }
.cart-btn:hover { background: var(--mist); }
.cart-count { min-width: 1.6rem; height: 1.6rem; border-radius: 999px; background: var(--sun); color: var(--charcoal); display: inline-grid; place-items: center; font-size: .85rem; font-weight: 700; padding: 0 .35rem; }
.cart-count.bump { animation: bump .35s ease; }
@keyframes bump { 50% { transform: scale(1.3); } }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; padding: .8rem 1.3rem; border-radius: 6px; font: 700 1rem var(--head); text-decoration: none; cursor: pointer; border: 2px solid transparent; }
.btn-primary { background: var(--sun); color: var(--charcoal); border-color: var(--sun); }
.btn-primary:hover { background: var(--sun-dark); border-color: var(--sun-dark); color: var(--charcoal); }
.btn-primary:disabled { opacity: .6; cursor: wait; }
.btn-ghost { background: transparent; color: var(--charcoal); border-color: var(--charcoal); }
.btn-ghost:hover { background: var(--charcoal); color: var(--white); }
.btn-block { width: 100%; }
.link-btn { background: none; border: 0; padding: 0; color: var(--panel); font: 600 1rem var(--body); text-decoration: underline; cursor: pointer; margin-bottom: 1rem; }
.icon-btn { background: none; border: 0; padding: .4rem; color: var(--charcoal); cursor: pointer; border-radius: 6px; }
.icon-btn:hover { background: var(--mist); }

/* Hero */
.hero { padding: 3.5rem 0 3rem; background: linear-gradient(var(--white) 0 70%, var(--mist) 70% 100%); }
.hero-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 3rem; align-items: center; }
.hero-copy { max-width: 36rem; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 34rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.6rem; }
.hero-art { width: 100%; max-width: 360px; justify-self: center; }

/* Category tiles drawn as solar panels */
.panel-row { list-style: none; margin: 3rem 0 0; padding: 0 1rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.panel-tile {
  width: 100%; min-height: 128px; border: 0; cursor: pointer; color: var(--white);
  transform: skewX(-10deg); border-radius: 4px;
  background-color: var(--panel);
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, .5) 2px, transparent 2px),
    linear-gradient(to bottom, rgba(255, 255, 255, .5) 2px, transparent 2px);
  background-size: calc(100% / 6) 50%;
  background-position: -1px -1px;
  border-bottom: 6px solid var(--charcoal);
  display: flex; flex-direction: column; align-items: flex-start; justify-content: flex-end; gap: .2rem;
  padding: 1rem 1.4rem;
}
.panel-tile > span { transform: skewX(10deg); background: var(--panel); padding: .1rem .45rem; }
.panel-name { font: 700 1.35rem var(--head); }
.panel-count { font-size: .95rem; }
.panel-tile:hover { background-color: var(--panel-dark); }
.panel-tile:hover > span { background: var(--panel-dark); }

/* Shop */
.shop { padding: 4rem 0 3rem; background: var(--mist); }
.shop-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.5rem; }
.shop-head h2 { margin: 0; }
.filters { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip { border: 2px solid var(--charcoal); background: var(--white); color: var(--charcoal); padding: .4rem .95rem; border-radius: 999px; font: 600 .95rem var(--body); cursor: pointer; }
.chip[aria-pressed="true"] { background: var(--charcoal); color: var(--white); }
.notice { background: var(--white); border-left: 5px solid var(--sun); border-radius: 0; padding: .8rem 1rem; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.loading, .grid-error { grid-column: 1 / -1; }

.card { background: var(--white); border: 1px solid var(--line); border-radius: 10px; display: flex; flex-direction: column; overflow: hidden; }
.card-img { aspect-ratio: 4 / 3; background: var(--white); border-bottom: 1px solid var(--line); display: grid; place-items: center; padding: 1rem; }
.card-img img { max-height: 100%; width: auto; object-fit: contain; }
.card-img svg { width: 42%; height: auto; color: var(--panel); }
.card-body { padding: 1.1rem 1.2rem 1.3rem; display: flex; flex-direction: column; flex: 1; }
.card-brand { margin: 0; color: var(--muted); font-weight: 600; }
.card-title { margin: .1rem 0 .1rem; font-size: 1.12rem; }
.card-model { margin: 0 0 .7rem; color: var(--muted); font-size: .95rem; }
.specs { list-style: none; padding: 0; margin: 0 0 1rem; display: flex; flex-wrap: wrap; gap: .4rem; }
.specs li { background: var(--mist); border-radius: 4px; padding: .1rem .55rem; font-size: .9rem; }
.card-buy { margin-top: auto; display: grid; grid-template-columns: 1fr auto; gap: .7rem; align-items: center; }
.price { margin: 0; font: 700 1.35rem var(--head); }
.qty { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 6px; }
.qty button { width: 2.2rem; height: 2.4rem; border: 0; background: none; font-size: 1.2rem; cursor: pointer; color: var(--charcoal); }
.qty button:hover { background: var(--mist); }
.qty input { width: 2.6rem; text-align: center; border: 0; font: 600 1rem var(--body); -moz-appearance: textfield; }
.qty input::-webkit-outer-spin-button, .qty input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.card-buy .btn { grid-column: 1 / -1; }
.sold-out { grid-column: 1 / -1; margin: 0; color: var(--muted); font-weight: 600; }

/* How it works */
.how { padding: 4rem 0; }
.steps { list-style: none; counter-reset: step; padding: 0; margin: 2rem 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.steps li { counter-increment: step; border-top: 4px solid var(--charcoal); padding-top: 1rem; }
.steps li::before { content: counter(step); display: inline-grid; place-items: center; width: 2.2rem; height: 2.2rem; border-radius: 50%; background: var(--sun); font: 700 1rem var(--head); margin-bottom: .8rem; }
.steps p { color: var(--muted); margin: 0; }

/* Help band */
.help { background: var(--panel); color: var(--white); padding: 3rem 0; }
.help-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem; }
.help-row > div { max-width: 40rem; }
.help p { margin: 0; color: #DCE6F0; }

/* Contact */
.contact { padding: 4rem 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 2rem; align-items: start; }
.contact dl { margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem 2rem; }
.contact dt { color: var(--muted); font-size: .95rem; }
.contact dd { margin: 0; font-weight: 600; font-size: 1.1rem; }

/* Footer */
.site-footer { background: var(--sand); padding: 2.5rem 0; font-size: .95rem; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; gap: 2rem; }
.footer-row p { margin: 0 0 .4rem; }

/* WhatsApp button */
.wa-float { position: fixed; right: 1.2rem; bottom: 1.2rem; z-index: 15; display: inline-flex; align-items: center; gap: .5rem; background: var(--charcoal); color: var(--white); text-decoration: none; padding: .7rem 1rem; border-radius: 999px; font-weight: 600; }
.wa-float:hover { background: #000; color: var(--white); }

/* Cart drawer */
.cart { margin: 0 0 0 auto; height: 100%; max-height: 100%; max-width: 100%; width: min(440px, 100%); border: 0; padding: 0; display: none; flex-direction: column; background: var(--white); color: var(--charcoal); }
.cart[open] { display: flex; animation: slide-in .25s ease; }
.cart::backdrop { background: rgba(43, 43, 43, .5); }
@keyframes slide-in { from { transform: translateX(100%); } }
.cart-head { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--line); }
.cart-head h2 { margin: 0; font-size: 1.3rem; }
.cart-body { flex: 1; overflow-y: auto; padding: 1rem 1.25rem; }
.cart-list { list-style: none; margin: 0; padding: 0; }
.cart-item { display: grid; grid-template-columns: 1fr auto; gap: .3rem 1rem; padding: .9rem 0; border-bottom: 1px solid var(--line); }
.cart-item-name { font-weight: 600; margin: 0; }
.cart-item-model { margin: 0; color: var(--muted); font-size: .9rem; }
.cart-item-price { margin: 0; font-weight: 700; text-align: right; }
.cart-item .qty { grid-column: 1; justify-self: start; }
.remove-btn { grid-column: 2; justify-self: end; align-self: center; background: none; border: 0; color: var(--panel); text-decoration: underline; cursor: pointer; font: 600 .95rem var(--body); }
.cart-empty { color: var(--muted); }
.cart-foot { border-top: 1px solid var(--line); padding: 1rem 1.25rem 1.25rem; display: grid; gap: .5rem; }
.sum-row { display: flex; justify-content: space-between; }
.sum-row.total { font: 700 1.2rem var(--head); margin-bottom: .5rem; }
.fine { font-size: .9rem; color: var(--muted); margin: 0; }

/* Checkout form */
.checkout-form fieldset { border: 0; padding: 0; margin: 0 0 1.2rem; }
.checkout-form legend { font: 700 1.05rem var(--head); margin-bottom: .4rem; }
.checkout-form label { display: block; font-weight: 600; margin: .7rem 0 .25rem; }
.checkout-form input, .checkout-form select, .checkout-form textarea { width: 100%; padding: .6rem .7rem; border: 1px solid #9AA7B4; border-radius: 6px; font: 1rem var(--body); color: var(--charcoal); background: var(--white); }
.checkout-form input[aria-invalid="true"], .checkout-form select[aria-invalid="true"] { border-color: #B42318; border-width: 2px; }
.checkout-form .radio { display: flex; gap: .6rem; align-items: flex-start; font-weight: 600; margin: .5rem 0; }
.checkout-form .radio input { width: auto; margin-top: .35rem; }
.checkout-form .radio small { display: block; font-weight: 400; color: var(--muted); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.form-error { background: #FDECEA; color: #8A1C12; padding: .7rem .9rem; border-radius: 6px; }

/* Thank-you page */
.receipt { padding: 3rem 0 4rem; max-width: 40rem; }
.receipt-box { border: 1px solid var(--line); border-radius: 10px; padding: 1.2rem 1.4rem; margin: 1.5rem 0; }
.receipt-id { font-weight: 700; margin-bottom: .6rem; }
.receipt table { width: 100%; border-collapse: collapse; }
.receipt td { padding: .45rem 0; border-bottom: 1px solid var(--line); }
.receipt td:last-child { text-align: right; white-space: nowrap; }
.receipt .total td { font-weight: 700; border-bottom: 0; }

/* Policies page */
.prose { padding: 3rem 0 4rem; max-width: 46rem; }
.prose h2 { margin-top: 2rem; font-size: 1.4rem; }
.prose ul { padding-left: 1.2rem; }

/* Responsive */
@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { max-width: 240px; justify-self: start; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .brand img { width: 170px; }
  .header-row { gap: .8rem; }
  .main-nav { gap: 1rem; }
  .hide-sm { display: none; }
  .cart-btn span:not(.cart-count) { display: none; }
  .hero { padding-top: 2rem; }
  .hero-art { display: none; }
  .panel-row { grid-template-columns: 1fr; gap: .9rem; padding: 0 .6rem; }
  .panel-tile { min-height: 92px; }
  .grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .contact dl { grid-template-columns: 1fr; }
  .wa-float span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}