:root {
  --cs-nav: #0f2b45;
  --cs-nav-dk: #081a2e;
  --cs-accent: #e67e22;
  --cs-zinc: #7a8993;
  --cs-bg: #f4f6f8;
  --cs-text: #1a2330;
  --cs-muted: #5a6470;
  --cs-border: #dde2e7;
}
* { box-sizing: border-box; }
body { font-family: 'Roboto', -apple-system, sans-serif; margin: 0; color: var(--cs-text); background: #fff; font-size: 16px; line-height: 1.65; }
h1, h2, h3, h4 { font-family: 'Roboto Slab', Georgia, serif; font-weight: 700; color: var(--cs-nav); line-height: 1.25; margin: 0 0 0.6em; }
h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
a { color: var(--cs-accent); text-decoration: none; }
a:hover { color: var(--cs-nav); text-decoration: underline; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

.cs-top { background: var(--cs-nav-dk); color: #fff; font-size: 0.85rem; padding: 8px 0; }
.cs-top .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.cs-top a { color: #fff; font-weight: 500; }
.cs-top a:hover { color: var(--cs-accent); }

header.cs-head { background: #fff; border-bottom: 3px solid var(--cs-accent); position: sticky; top: 0; z-index: 100; box-shadow: 0 1px 6px rgba(0,0,0,0.05); }
.cs-head-row { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.cs-logo img { height: 52px; }
.cs-nav { display: flex; gap: 2px; align-items: center; }
.cs-nav a { color: var(--cs-text); padding: 12px 18px; font-size: 0.95rem; font-weight: 500; border-bottom: 2px solid transparent; }
.cs-nav a:hover, .cs-nav a.on { color: var(--cs-nav); border-bottom-color: var(--cs-accent); text-decoration: none; }
.cs-nav .devis { background: var(--cs-accent); color: #fff !important; border-radius: 0; border: 0; padding: 14px 22px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.85rem; }
.cs-nav .devis:hover { background: var(--cs-nav); color: #fff !important; }
.cs-burger { display: none; background: none; border: 0; cursor: pointer; font-size: 26px; color: var(--cs-nav); }

.cs-hero { position: relative; padding: 100px 0; background: linear-gradient(rgba(15, 43, 69, 0.85), rgba(15, 43, 69, 0.75)), url('../images/hero-toiture.jpg') center/cover; color: #fff; }
.cs-hero h1 { color: #fff; max-width: 760px; }
.cs-hero .eye { display: inline-block; color: var(--cs-accent); text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.25em; font-weight: 600; margin-bottom: 16px; }
.cs-hero p { max-width: 640px; font-size: 1.08rem; opacity: 0.95; margin-bottom: 28px; }
.btn { display: inline-block; padding: 14px 28px; background: var(--cs-accent); color: #fff; border: 0; font-family: inherit; font-weight: 600; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.08em; cursor: pointer; }
.btn:hover { background: #c96410; color: #fff; text-decoration: none; }
.btn-outline { background: transparent; border: 2px solid #fff; }
.btn-outline:hover { background: #fff; color: var(--cs-nav); }

.cs-page-hero { background: var(--cs-nav); color: #fff; padding: 60px 0; }
.cs-page-hero h1 { color: #fff; margin-bottom: 10px; }
.cs-page-hero p { opacity: 0.9; max-width: 640px; }

section { padding: 70px 0; }
.cs-services { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.cs-serv { background: #fff; border: 1px solid var(--cs-border); border-top: 3px solid var(--cs-accent); padding: 28px; transition: box-shadow 0.3s; }
.cs-serv:hover { box-shadow: 0 8px 28px rgba(15, 43, 69, 0.1); }
.cs-serv h3 { margin-bottom: 10px; }
.cs-serv p { color: var(--cs-muted); font-size: 0.95rem; }
.cs-serv a { font-weight: 600; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }

.cs-intro { text-align: center; max-width: 720px; margin: 0 auto 50px; }
.cs-intro h2 { margin-bottom: 14px; }
.cs-intro p { color: var(--cs-muted); font-size: 1.05rem; }
.eye { display: inline-block; color: var(--cs-accent); text-transform: uppercase; font-size: 0.78rem; letter-spacing: 0.25em; font-weight: 600; }

.cs-alt { background: var(--cs-bg); }
.cs-two { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.cs-two img { width: 100%; }

.cs-nums { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 24px; margin: 40px 0; }
.cs-num { text-align: center; padding: 20px; border-left: 2px solid var(--cs-accent); }
.cs-num .big { font-family: 'Roboto Slab', serif; font-size: 2.3rem; color: var(--cs-nav); font-weight: 700; }
.cs-num .lbl { font-size: 0.88rem; color: var(--cs-muted); }

.cs-reco { background: #fff; padding: 40px; border: 1px solid var(--cs-border); border-left: 4px solid var(--cs-accent); margin: 20px 0; }
.cs-reco p:last-child { margin-bottom: 0; }

.article { max-width: 800px; margin: 0 auto; }
.article .lead-img { width: 100%; max-height: 440px; object-fit: cover; margin-bottom: 30px; }
.article h2 { margin-top: 40px; }
.article h3 { color: var(--cs-accent); margin-top: 24px; }
.article ul li, .article ol li { margin-bottom: 6px; }

.cs-cta { background: var(--cs-nav); color: #fff; padding: 60px 0; text-align: center; }
.cs-cta h2 { color: #fff; }
.cs-cta p { max-width: 620px; margin: 0 auto 24px; opacity: 0.9; }

.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 40px; }
.info { background: var(--cs-bg); padding: 30px; border-left: 3px solid var(--cs-accent); }
.info h3 { font-size: 0.92rem; text-transform: uppercase; letter-spacing: 0.1em; margin-top: 20px; }
.info h3:first-child { margin-top: 0; }
form { display: flex; flex-direction: column; gap: 14px; }
label { font-size: 0.88rem; font-weight: 500; color: var(--cs-nav); }
input, textarea, select { width: 100%; padding: 12px; border: 1px solid var(--cs-border); font-family: inherit; font-size: 1rem; background: #fff; }
input:focus, textarea:focus { outline: none; border-color: var(--cs-accent); }
textarea { min-height: 120px; resize: vertical; }

footer.cs-foot { background: var(--cs-nav-dk); color: rgba(255,255,255,0.78); padding: 50px 0 20px; font-size: 0.9rem; }
.cs-foot-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 30px; }
.cs-foot h4 { color: #fff; font-family: 'Roboto', sans-serif; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 14px; }
.cs-foot ul { list-style: none; padding: 0; margin: 0; }
.cs-foot li { margin-bottom: 6px; }
.cs-foot a { color: rgba(255,255,255,0.78); }
.cs-foot a:hover { color: var(--cs-accent); }
.cs-socials { display: flex; gap: 10px; margin-top: 14px; }
.cs-socials a { width: 32px; height: 32px; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; }
.cs-socials a:hover { background: var(--cs-accent); }
.cs-socials svg { width: 15px; height: 15px; fill: #fff; }
.cs-foot-bot { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 18px; text-align: center; font-size: 0.82rem; opacity: 0.7; }

.legal { max-width: 780px; margin: 0 auto; }
.legal h2 { margin-top: 32px; }
.err { text-align: center; padding: 100px 20px; }
.err .big { font-family: 'Roboto Slab', serif; font-size: clamp(5rem, 15vw, 9rem); color: var(--cs-accent); font-weight: 700; }

@media (max-width: 900px) {
  .cs-two { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .cs-foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .cs-nav { display: none; position: absolute; right: 20px; top: 78px; flex-direction: column; background: #fff; border: 1px solid var(--cs-border); }
  .cs-nav.open { display: flex; }
  .cs-nav a { padding: 14px 22px; border-bottom: 1px solid var(--cs-border); }
  .cs-burger { display: block; }
  .cs-foot-grid { grid-template-columns: 1fr; }
}