/* ==========================================================================
   NẮNG VIỆT SOLAR — Lắp điện mặt trời áp mái cho hộ gia đình & doanh nghiệp
   (khảo sát miễn phí, bảo hành 12 năm, trả góp 0%) · TP.HCM / Hà Nội
   Bố cục: header trắng dính (logo VÒNG MẶT TRỜI CSS + nav + nút "Khảo sát
   miễn phí" vàng) × hero là MÁY TÍNH TIẾT KIỆM (cột trái tiêu đề + 3 chip tin
   cậy; cột phải THẺ LỚN: hóa đơn/tháng range + number, loại mái, tỉnh → kWp,
   số tấm, chi phí, tiết kiệm/năm, hoàn vốn + BIỂU ĐỒ CỘT CSS 10 NĂM cập nhật
   trực tiếp) × dải xanh đậm "CO₂ đã giảm" ĐẾM SỐ + 3 chỉ số × MÔ PHỎNG MÁI NHÀ
   (range diện tích + hướng → LƯỚI TẤM PIN VẼ BẰNG CSS lấp đầy mái) × giải pháp
   2 thẻ lớn (hộ gia đình / doanh nghiệp) × dự án thẻ có NHÃN kWp × quy trình
   5 bước ray ngang × bảo hành & tài chính 3 thẻ × FAQ details × footer xanh đậm.
   Trang con: bảng so sánh gói 3/5/10 kWp, bảng thiết bị, lọc dự án theo
   loại/tỉnh, checklist giấy tờ, form đăng ký khảo sát.
   Font: "Red Hat Display" (tiêu đề) + "Inter" (thân).
   Màu: vàng nắng #FFB400 · xanh đậm #0B2A4A · trắng · xanh trời nhạt #EAF4FB.
   Ảnh: link trực tiếp (Wikimedia Commons), đặt qua biến --img trên .ph.
   ========================================================================== */
:root{
  --sun:#FFB400; --sun-d:#E39F00; --sun-soft:#FFF3D6; --sun-glow:rgba(255,180,0,.25);
  --navy:#0B2A4A; --navy2:#123A63; --navy3:#1C4B7A;
  --sky:#EAF4FB; --sky2:#F5F9FD;
  --ink:#12233A; --muted:#5B6B7C; --line:#D6E2EC; --ph:#dfe9f2;
  --ok:#1E9E5A; --bad:#D9534F;
  --ff-h:'Red Hat Display','Segoe UI',Arial,sans-serif; --ff:'Inter','Segoe UI',Arial,sans-serif;
  --r:14px; --r-s:8px; --shadow:0 20px 50px rgba(11,42,74,.14);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--ff);color:var(--ink);background:#fff;line-height:1.6;font-size:15.5px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
h1,h2,h3,h4{font-family:var(--ff-h);line-height:1.15;color:var(--navy);font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(34px,4.2vw,56px)}
h2{font-size:clamp(26px,3vw,38px)}
h3{font-size:20px}
p{color:var(--muted)}
.container{width:min(1200px,92%);margin:0 auto}
.ph{background:var(--img,var(--ph)) center/cover no-repeat;background-color:#dfe9f2}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--sun-d);margin-bottom:12px}
.eyebrow::before{content:"";width:22px;height:3px;background:var(--sun);border-radius:2px}
.sec{padding:80px 0}
.sec--sky{background:var(--sky)}
.sec--navy{background:var(--navy);color:#fff}
.sec--navy h2,.sec--navy h3{color:#fff}
.sec--navy p{color:#B8CBDE}
.sec__head{max-width:680px;margin-bottom:40px}
.sec__head p{font-size:17px;margin-top:10px}
.sec__head--center{margin-inline:auto;text-align:center}
.sec__head--center .eyebrow::before{display:none}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:999px;font-weight:700;font-family:var(--ff-h);font-size:15px;border:2px solid transparent;cursor:pointer;transition:.2s;white-space:nowrap}
.btn--sun{background:var(--sun);color:var(--navy);box-shadow:0 8px 20px var(--sun-glow)}
.btn--sun:hover{background:var(--sun-d);transform:translateY(-1px)}
.btn--navy{background:var(--navy);color:#fff}
.btn--navy:hover{background:var(--navy2)}
.btn--ghost{border-color:var(--navy);color:var(--navy);background:transparent}
.btn--ghost:hover{background:var(--navy);color:#fff}
.btn--white{background:#fff;color:var(--navy)}
.btn--white:hover{background:var(--sun)}
.btn--sm{padding:9px 16px;font-size:13.5px}
.btn--block{width:100%}

/* Header */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header__in{display:flex;align-items:center;justify-content:space-between;gap:24px;height:74px}
.logo{display:flex;align-items:center;gap:11px;font-family:var(--ff-h);font-weight:800;font-size:21px;color:var(--navy);letter-spacing:-.01em}
.logo em{font-style:normal;color:var(--sun-d)}
.sunmark{width:38px;height:38px;border-radius:50%;position:relative;flex:none;
  background:repeating-conic-gradient(var(--sun) 0 12deg,transparent 12deg 30deg)}
.sunmark::after{content:"";position:absolute;inset:8px;border-radius:50%;background:var(--sun);box-shadow:0 0 0 3px #fff}
.nav{display:flex;gap:4px}
.nav a{padding:9px 14px;border-radius:999px;font-weight:600;font-size:14.5px;color:var(--ink)}
.nav a:hover,.nav a.is-active{background:var(--sky);color:var(--navy)}
.header__cta{display:flex;align-items:center;gap:14px}
.hotline{font-size:13px;color:var(--muted);line-height:1.2}
.hotline b{display:block;color:var(--navy);font-family:var(--ff-h);font-size:16px}
.burger{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:10px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.burger span{width:20px;height:2px;background:var(--navy);border-radius:2px;transition:.2s}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Hero = calculator */
.hero{background:var(--sky);position:relative;overflow:hidden;padding:64px 0 80px}
.hero::before{content:"";position:absolute;width:820px;height:820px;border-radius:50%;right:-260px;top:-380px;
  background:repeating-conic-gradient(rgba(255,180,0,.14) 0 6deg,transparent 6deg 14deg);
  -webkit-mask:radial-gradient(circle,#000 0 40%,transparent 72%);mask:radial-gradient(circle,#000 0 40%,transparent 72%)}
.hero::after{content:"";position:absolute;width:300px;height:300px;border-radius:50%;right:0;top:-120px;background:radial-gradient(circle,var(--sun) 0 34%,transparent 70%);opacity:.75;filter:blur(4px)}
.hero__in{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1.12fr;gap:56px;align-items:center}
.hero h1 span{color:var(--sun-d)}
.hero__lead{font-size:18px;margin:18px 0 26px;max-width:520px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 16px;font-weight:600;font-size:14px;color:var(--navy);box-shadow:0 4px 14px rgba(11,42,74,.06)}
.chip i{width:22px;height:22px;border-radius:50%;background:var(--sun-soft);color:var(--sun-d);display:grid;place-items:center;font-style:normal;font-size:12px;font-weight:800}
.hero__note{margin-top:28px;font-size:13.5px;display:flex;gap:10px;align-items:center}
.hero__note .ph{width:56px;height:56px;border-radius:12px;flex:none}

/* Calculator card */
.calc{background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:28px;border-top:6px solid var(--sun)}
.calc__title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}
.calc__title h2{font-size:22px}
.calc__title small{font-size:12.5px;color:var(--muted);background:var(--sky);padding:5px 11px;border-radius:999px;font-weight:600}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:13.5px;margin-bottom:6px;color:var(--navy)}
.field input,.field select,.field textarea{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;font:inherit;font-size:15px;color:var(--ink);background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--sun);box-shadow:0 0 0 3px var(--sun-glow)}
.field textarea{min-height:120px;resize:vertical}
.field--row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.bill{display:grid;grid-template-columns:1fr 150px;gap:12px;align-items:center}
.bill .money{position:relative}
.bill .money::after{content:"đ";position:absolute;right:12px;top:50%;transform:translateY(-50%);font-weight:700;color:var(--muted)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:8px;border-radius:999px;background:linear-gradient(90deg,var(--sun) var(--p,30%),var(--line) var(--p,30%));border:0!important;padding:0!important}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;background:#fff;border:4px solid var(--sun);box-shadow:0 2px 8px rgba(0,0,0,.2);cursor:pointer}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--sun);cursor:pointer}
.range-scale{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-top:4px}
.outs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:6px}
.out{background:var(--sky);border-radius:12px;padding:12px 14px}
.out small{display:block;font-size:11.5px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.06em}
.out b{display:block;font-family:var(--ff-h);font-size:22px;color:var(--navy);line-height:1.2;margin-top:2px}
.out b sub{font-size:12px;vertical-align:baseline;color:var(--muted);font-family:var(--ff)}
.out--sun{background:var(--sun);}
.out--sun small{color:rgba(11,42,74,.7)}
.out--wide{grid-column:span 3;display:flex;justify-content:space-between;align-items:center;gap:12px}
.out--wide b{font-size:26px}
.out--wide .payback{font-size:13px;color:var(--navy);text-align:right}
.out--wide .payback b{font-size:26px;display:inline}
.calc__foot{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:16px;flex-wrap:wrap}
.calc__foot p{font-size:12.5px}

/* CSS bar chart */
.chart{margin-top:18px;border:1px solid var(--line);border-radius:12px;padding:14px 14px 10px}
.chart__head{display:flex;justify-content:space-between;align-items:center;font-size:12.5px;margin-bottom:10px;gap:10px;flex-wrap:wrap}
.chart__head b{font-family:var(--ff-h);color:var(--navy);font-size:14px}
.legend{display:flex;gap:14px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.legend .l1 i{background:#C6D3DF}
.legend .l2 i{background:var(--sun)}
.bars{display:grid;grid-template-columns:repeat(10,1fr);gap:8px;height:150px;align-items:end;border-bottom:1px solid var(--line);padding-bottom:4px}
.bar{display:flex;gap:2px;align-items:flex-end;height:100%;position:relative}
.bar span{flex:1;border-radius:3px 3px 0 0;transition:height .35s ease;min-height:2px}
.bar .b1{background:#C6D3DF}
.bar .b2{background:var(--sun)}
.bar:hover::after{content:attr(data-tip);position:absolute;bottom:calc(100% + 6px);left:50%;transform:translateX(-50%);background:var(--navy);color:#fff;font-size:11px;padding:5px 8px;border-radius:6px;white-space:nowrap;z-index:2}
.bars-x{display:grid;grid-template-columns:repeat(10,1fr);gap:8px;font-size:11px;color:var(--muted);text-align:center;margin-top:5px}
.chart__sum{display:flex;justify-content:space-between;gap:12px;font-size:13px;margin-top:10px;flex-wrap:wrap}
.chart__sum b{color:var(--ok);font-family:var(--ff-h);font-size:15px}

/* CO2 strip */
.strip{background:var(--navy);color:#fff;padding:36px 0}
.strip__in{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:24px;align-items:center}
.strip__main{display:flex;align-items:center;gap:18px;border-right:1px solid rgba(255,255,255,.15);padding-right:24px}
.strip__main .leaf{width:64px;height:64px;border-radius:50% 0 50% 0;background:var(--sun);flex:none;display:grid;place-items:center;color:var(--navy);font-family:var(--ff-h);font-weight:800;font-size:13px}
.strip__main b{display:block;font-family:var(--ff-h);font-size:40px;line-height:1;color:var(--sun)}
.strip__main small,.stat small{display:block;color:#B8CBDE;font-size:13px;margin-top:4px}
.stat b{display:block;font-family:var(--ff-h);font-size:30px;line-height:1;color:#fff}
.stat b sub{font-size:13px;color:#B8CBDE;vertical-align:baseline;margin-left:2px}

/* Roof simulator */
.roofsim{display:grid;grid-template-columns:380px 1fr;gap:40px;align-items:start}
.roofsim__panel{background:#fff;border-radius:var(--r);padding:26px;border:1px solid var(--line)}
.roofsim__panel h3{margin-bottom:6px}
.roofsim__panel p{font-size:14px;margin-bottom:18px}
.dirs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.dirs input{position:absolute;opacity:0;pointer-events:none}
.dirs label{display:block;text-align:center;border:1.5px solid var(--line);border-radius:10px;padding:9px 6px;font-size:13.5px;font-weight:600;cursor:pointer;color:var(--navy)}
.dirs label small{display:block;font-weight:500;color:var(--muted);font-size:11.5px}
.dirs input:checked+label{border-color:var(--sun);background:var(--sun-soft)}
.roof{position:relative;background:#fff;border-radius:var(--r);border:1px solid var(--line);padding:26px}
.roof__sky{background:linear-gradient(180deg,#CFE6F7,#EAF4FB);border-radius:12px;padding:26px 26px 0;position:relative;overflow:hidden}
.roof__sun{position:absolute;right:26px;top:18px;width:52px;height:52px;border-radius:50%;background:var(--sun);box-shadow:0 0 0 12px rgba(255,180,0,.18),0 0 0 24px rgba(255,180,0,.08)}
.roof__shape{margin:36px auto 0;width:var(--w,80%);max-width:100%;transition:width .35s ease}
.roof__ridge{height:14px;background:var(--navy);border-radius:6px 6px 0 0;width:calc(100% + 24px);margin-left:-12px}
.roof__face{background:#8C5A3C;background-image:repeating-linear-gradient(0deg,rgba(0,0,0,.12) 0 2px,transparent 2px 14px);padding:10px;position:relative}
.roof__face::after{content:"";position:absolute;left:-12px;right:-12px;bottom:-8px;height:8px;background:var(--navy2);border-radius:0 0 6px 6px}
.panels{display:grid;grid-template-columns:repeat(var(--cols,6),1fr);gap:4px}
.pv{aspect-ratio:2/1;background:linear-gradient(135deg,#1A3D6B,#0B2A4A);border:1px solid #6FA3D8;border-radius:2px;background-image:linear-gradient(90deg,transparent 48%,rgba(255,255,255,.18) 49% 51%,transparent 52%),linear-gradient(135deg,#1E4A80,#0B2A4A);animation:pv-in .3s ease both}
.pv.is-empty{background:transparent;border:1px dashed rgba(255,255,255,.35);animation:none}
@keyframes pv-in{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}
.roof__wall{height:56px;background:#F3EEE4;border-top:0;width:calc(100% - 24px);margin:8px auto 0;position:relative;border-radius:0 0 4px 4px}
.roof__wall::before,.roof__wall::after{content:"";position:absolute;top:14px;width:18px;height:26px;background:#CFE6F7;border:2px solid #C4B9A6}
.roof__wall::before{left:18%}.roof__wall::after{right:18%}
.roof__out{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:22px}
.roof__out .out b{font-size:20px}

/* Solutions */
.sol{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.solcard{background:#fff;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);display:flex;flex-direction:column;transition:.25s}
.solcard:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.solcard .ph{aspect-ratio:16/8;position:relative}
.solcard .ph .tag{position:absolute;left:18px;top:18px;background:var(--navy);color:#fff;font-size:12px;font-weight:700;padding:6px 12px;border-radius:999px;letter-spacing:.06em;text-transform:uppercase}
.solcard--biz .ph .tag{background:var(--sun);color:var(--navy)}
.solcard__body{padding:28px;flex:1;display:flex;flex-direction:column}
.solcard__body h3{font-size:26px;margin-bottom:6px}
.solcard__body>p{margin-bottom:16px}
.feats{margin-bottom:22px;flex:1}
.feats li{display:flex;gap:10px;padding:8px 0;border-top:1px dashed var(--line);font-size:14.5px}
.feats li::before{content:"✓";width:22px;height:22px;border-radius:50%;background:var(--sun-soft);color:var(--sun-d);font-weight:800;font-size:12px;display:grid;place-items:center;flex:none;margin-top:2px}
.solcard__meta{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.solcard__meta .price{font-size:13px;color:var(--muted)}
.solcard__meta .price b{display:block;font-family:var(--ff-h);font-size:20px;color:var(--navy)}

/* Projects */
.projects{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.proj{background:#fff;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);transition:.25s}
.proj:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.proj .ph{aspect-ratio:4/3;position:relative}
.kwp{position:absolute;left:14px;top:14px;background:var(--sun);color:var(--navy);font-family:var(--ff-h);font-weight:800;font-size:15px;padding:6px 12px;border-radius:8px;box-shadow:0 4px 10px rgba(0,0,0,.15)}
.kwp small{font-size:11px;font-weight:700;margin-left:2px}
.proj__type{position:absolute;right:14px;top:14px;background:rgba(11,42,74,.85);color:#fff;font-size:11.5px;font-weight:600;padding:5px 10px;border-radius:999px}
.proj__body{padding:18px 20px 20px}
.proj__body h3{font-size:17px;margin-bottom:4px}
.proj__loc{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:6px}
.proj__loc::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--sun)}
.proj__stats{display:flex;gap:14px;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.proj__stats b{display:block;color:var(--navy);font-family:var(--ff-h);font-size:16px}
.filters{display:flex;gap:14px;flex-wrap:wrap;align-items:end;margin-bottom:28px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.filters .field{margin:0;min-width:200px;flex:1}
.filters .count{font-size:14px;color:var(--muted);padding-bottom:10px}
.filters .count b{color:var(--navy)}
.empty{display:none;text-align:center;padding:40px;color:var(--muted);border:1px dashed var(--line);border-radius:var(--r)}
.empty.is-show{display:block}

/* Process */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;position:relative;counter-reset:st}
.steps::before{content:"";position:absolute;left:8%;right:8%;top:30px;height:3px;background:repeating-linear-gradient(90deg,var(--sun) 0 10px,transparent 10px 18px)}
.step{position:relative;padding-top:14px}
.step__n{width:60px;height:60px;border-radius:50%;background:#fff;border:3px solid var(--sun);display:grid;place-items:center;font-family:var(--ff-h);font-weight:800;font-size:22px;color:var(--navy);margin-bottom:16px;position:relative;z-index:1;box-shadow:0 0 0 8px var(--sky)}
.sec--navy .step__n{box-shadow:0 0 0 8px var(--navy);background:var(--navy);color:var(--sun)}
.step h3{font-size:17px;margin-bottom:6px}
.step p{font-size:14px}
.step time{display:inline-block;margin-top:8px;font-size:12px;font-weight:700;color:var(--sun-d);background:var(--sun-soft);padding:3px 10px;border-radius:999px}
.sec--navy .step time{background:rgba(255,180,0,.15);color:var(--sun)}
.steps--detail{grid-template-columns:1fr;gap:0;counter-reset:none}
.steps--detail::before{display:none}
.stepd{display:grid;grid-template-columns:90px 1fr 260px;gap:28px;padding:32px 0;border-top:1px solid var(--line);align-items:start}
.stepd:first-child{border-top:0}
.stepd__n{font-family:var(--ff-h);font-size:56px;font-weight:800;color:var(--sun);line-height:1}
.stepd h3{font-size:22px;margin-bottom:8px}
.stepd ul{margin-top:12px}
.stepd ul li{font-size:14.5px;padding:5px 0 5px 22px;position:relative;color:var(--ink)}
.stepd ul li::before{content:"";position:absolute;left:0;top:13px;width:10px;height:10px;border-radius:50%;background:var(--sun)}
.stepd__side{background:var(--sky);border-radius:12px;padding:18px}
.stepd__side small{display:block;font-size:11.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}
.stepd__side b{font-family:var(--ff-h);font-size:22px;color:var(--navy);display:block;margin-bottom:8px}
.stepd__side p{font-size:13.5px}

/* Guarantee cards */
.tri{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tri.offices{grid-template-columns:repeat(4,1fr)}
.gcard{background:#fff;border-radius:var(--r);padding:30px;border:1px solid var(--line);position:relative;overflow:hidden}
.gcard::before{content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;background:var(--sun-soft)}
.gcard__ic{width:56px;height:56px;border-radius:14px;background:var(--navy);color:var(--sun);display:grid;place-items:center;font-family:var(--ff-h);font-weight:800;font-size:18px;margin-bottom:18px;position:relative}
.gcard h3{margin-bottom:8px}
.gcard p{font-size:14.5px}
.gcard .big{font-family:var(--ff-h);font-size:40px;color:var(--sun-d);line-height:1;margin-bottom:6px;font-weight:800}
.gcard ul{margin-top:12px}
.gcard ul li{font-size:14px;padding:5px 0;border-top:1px dashed var(--line);color:var(--ink)}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;padding:0 22px}
.faq summary{cursor:pointer;list-style:none;padding:18px 0;font-weight:700;font-family:var(--ff-h);font-size:17px;color:var(--navy);display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";width:30px;height:30px;border-radius:50%;background:var(--sky);display:grid;place-items:center;font-size:20px;flex:none;transition:.2s}
.faq details[open] summary::after{content:"–";background:var(--sun)}
.faq details p{padding:0 0 18px;font-size:15px}

/* CTA band */
.cta{background:linear-gradient(120deg,var(--sun),#FFC94A);border-radius:22px;padding:44px 48px;display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center}
.cta h2{color:var(--navy);font-size:30px}
.cta p{color:rgba(11,42,74,.8);margin-top:6px}

/* Footer */
.footer{background:var(--navy);color:#B8CBDE;padding:60px 0 24px}
.footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer .logo{color:#fff;margin-bottom:14px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px;text-transform:uppercase;letter-spacing:.08em}
.footer li{margin-bottom:9px;font-size:14px}
.footer a:hover{color:var(--sun)}
.footer p{color:#B8CBDE;font-size:14px}
.footer__bot{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;padding-top:20px;font-size:13px}
.footer__bot a{color:#fff}

/* Page hero */
.phero{background:var(--navy);color:#fff;padding:60px 0;position:relative;overflow:hidden}
.phero::after{content:"";position:absolute;right:-120px;top:-160px;width:420px;height:420px;border-radius:50%;background:repeating-conic-gradient(rgba(255,180,0,.22) 0 6deg,transparent 6deg 14deg);-webkit-mask:radial-gradient(circle,#000 0 40%,transparent 70%);mask:radial-gradient(circle,#000 0 40%,transparent 70%)}
.phero h1{color:#fff;font-size:clamp(30px,3.6vw,46px)}
.phero p{color:#B8CBDE;font-size:17px;max-width:640px;margin-top:10px}
.crumb{font-size:13px;color:#B8CBDE;margin-bottom:12px}
.crumb a:hover{color:var(--sun)}
.crumb span{margin:0 8px;opacity:.5}

/* Tables */
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--r)}
table{width:100%;border-collapse:collapse;min-width:640px;font-size:14.5px}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--sky);color:var(--navy);font-family:var(--ff-h);font-size:14px;text-transform:uppercase;letter-spacing:.05em}
tbody tr:last-child td{border-bottom:0}
td b{color:var(--navy)}
.cmp th:not(:first-child),.cmp td:not(:first-child){text-align:center}
.cmp th.hl{background:var(--sun);color:var(--navy)}
.cmp td.hl{background:var(--sun-soft)}
.cmp .yes{color:var(--ok);font-weight:700}
.cmp .no{color:#B7C3CE}
.note{font-size:13px;color:var(--muted);margin-top:12px}

/* Two-col detail */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split .ph{aspect-ratio:4/3;border-radius:var(--r)}
.split h2{margin-bottom:12px}
.split .feats{margin-top:18px}
.specs{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:18px}
.spec{background:var(--sky);border-radius:10px;padding:12px 14px;font-size:13px;color:var(--muted)}
.spec b{display:block;color:var(--navy);font-family:var(--ff-h);font-size:18px}

/* Assumptions */
.assump{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
.assump .table-wrap{min-width:0}
.assump table{min-width:0}
.tiers{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px}
.tiers h3{margin-bottom:10px}
.tier{display:grid;grid-template-columns:1fr auto;gap:10px;padding:8px 0;border-top:1px dashed var(--line);font-size:14px}
.tier b{color:var(--navy)}

/* Checklist */
.check{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.checkbox{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px}
.checkbox h3{margin-bottom:12px;display:flex;align-items:center;gap:10px}
.checkbox h3 i{width:30px;height:30px;border-radius:8px;background:var(--sun);color:var(--navy);display:grid;place-items:center;font-style:normal;font-size:13px;font-weight:800}
.checkbox li{display:flex;gap:10px;padding:9px 0;border-top:1px dashed var(--line);font-size:14.5px}
.checkbox li::before{content:"☐";color:var(--sun-d);font-size:17px;line-height:1.3}
.timeline-bar{display:grid;grid-template-columns:2fr 3fr 1fr 5fr 2fr;gap:6px;margin-top:22px}
.tb{background:var(--sky);border-radius:8px;padding:10px 12px;font-size:12.5px;color:var(--navy);font-weight:600;text-align:center;border-bottom:4px solid var(--navy)}
.tb.is-sun{border-bottom-color:var(--sun)}
.tb small{display:block;color:var(--muted);font-weight:500}

/* Forms */
.formcard{background:#fff;border-radius:var(--r);padding:32px;border:1px solid var(--line);box-shadow:var(--shadow)}
.formcard h2{font-size:26px;margin-bottom:6px}
.formcard>p{margin-bottom:22px;font-size:14.5px}
.form-msg{display:none;background:#E8F7EE;color:#176B3E;border-radius:10px;padding:12px 16px;font-size:14px;margin-top:14px}
.form-msg.is-show{display:block}
.contact{display:grid;grid-template-columns:1fr 1.2fr;gap:40px;align-items:start}
.cinfo{display:grid;gap:14px}
.cinfo .item{display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.cinfo .item i{width:44px;height:44px;border-radius:12px;background:var(--sun-soft);color:var(--sun-d);display:grid;place-items:center;font-style:normal;font-weight:800;flex:none;font-family:var(--ff-h)}
.cinfo .item b{display:block;color:var(--navy);margin-bottom:2px}
.cinfo .item p{font-size:14px}
.map{margin-top:14px;border-radius:12px;height:220px;background:linear-gradient(#EAF4FB,#EAF4FB) padding-box,#fff;position:relative;overflow:hidden;border:1px solid var(--line);
  background-image:linear-gradient(rgba(11,42,74,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(11,42,74,.08) 1px,transparent 1px);background-size:28px 28px}
.map::before{content:"";position:absolute;left:10%;right:-5%;top:45%;height:14px;background:#fff;transform:rotate(-8deg);border-top:2px solid var(--line);border-bottom:2px solid var(--line)}
.map::after{content:"";position:absolute;left:52%;top:38%;width:22px;height:22px;border-radius:50% 50% 50% 0;transform:rotate(-45deg);background:var(--sun);border:3px solid var(--navy)}
.map span{position:absolute;left:56%;top:22%;background:var(--navy);color:#fff;font-size:12px;padding:5px 10px;border-radius:6px}
.radio-row{display:flex;gap:10px;flex-wrap:wrap}
.radio-row input{position:absolute;opacity:0;pointer-events:none}
.radio-row label{border:1.5px solid var(--line);border-radius:999px;padding:8px 16px;font-size:14px;font-weight:600;cursor:pointer;color:var(--navy);margin:0}
.radio-row input:checked+label{background:var(--sun);border-color:var(--sun)}

/* Misc */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px}
.card h3{margin-bottom:8px}
.badge{display:inline-block;background:var(--sun);color:var(--navy);font-size:11.5px;font-weight:800;padding:3px 10px;border-radius:999px;letter-spacing:.06em;text-transform:uppercase}
.badge--sky{background:var(--sky);color:var(--navy)}
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;font-size:14.5px}
.review .stars{color:var(--sun);letter-spacing:2px;margin-bottom:10px}
.review footer{margin-top:14px;font-size:13px;color:var(--muted)}
.review footer b{color:var(--navy);display:block}
.sticky{position:sticky;top:94px}

/* Responsive */
@media (max-width:1100px){
  .hero__in{gap:36px}
  .projects{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
  .steps::before{display:none}
  .footer__grid{grid-template-columns:1fr 1fr}
  .tri.offices{grid-template-columns:1fr 1fr}
  .roofsim{grid-template-columns:320px 1fr}
  .strip__in{grid-template-columns:1fr 1fr}
  .strip__main{border-right:0;grid-column:span 2;border-bottom:1px solid rgba(255,255,255,.15);padding:0 0 18px}
}
@media (max-width:980px){
  .nav{display:none;position:absolute;left:0;right:0;top:74px;background:#fff;flex-direction:column;padding:14px 4%;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav.is-open{display:flex}
  .burger{display:flex}
  .hotline{display:none}
  .hero__in{grid-template-columns:1fr}
  .hero{padding:48px 0 60px}
  .roofsim{grid-template-columns:1fr}
  .sol,.tri,.tri.offices,.split,.assump,.check,.contact,.grid-2,.reviews{grid-template-columns:1fr}
  .stepd{grid-template-columns:70px 1fr}
  .stepd__side{grid-column:2}
  .cta{grid-template-columns:1fr;padding:32px}
  .sticky{position:static}
}
@media (max-width:640px){
  .sec{padding:56px 0}
  .header__cta .btn{display:none}
  .calc{padding:20px}
  .bill{grid-template-columns:1fr}
  .outs{grid-template-columns:1fr 1fr}
  .out--wide{grid-column:span 2;flex-direction:column;align-items:flex-start}
  .out--wide .payback{text-align:left}
  .field--row{grid-template-columns:1fr}
  .projects,.steps{grid-template-columns:1fr}
  .strip__in{grid-template-columns:1fr}
  .strip__main{grid-column:span 1}
  .roof__out{grid-template-columns:1fr 1fr}
  .dirs{grid-template-columns:repeat(3,1fr)}
  .footer__grid{grid-template-columns:1fr}
  .stepd{grid-template-columns:1fr}
  .stepd__side{grid-column:1}
  .timeline-bar{grid-template-columns:1fr 1fr}
  .specs{grid-template-columns:1fr}
  .bars,.bars-x{gap:4px}
}