/* =========================================================
   ALTUN — Plâtrerie & Isolation · Maquette ATOM Studios
   Charte : bleu confiance + vert éco/RGE, mobile-first
   ========================================================= */

:root {
  --blue-900: #0c2c57;
  --blue-800: #103a73;
  --blue-700: #17498f;
  --blue-600: #1f5fb0;
  --blue-500: #2f74cf;
  --blue-100: #e9f1fb;
  --blue-50:  #f4f8fd;

  --green-700: #1f8a45;
  --green-600: #2aa257;
  --green-500: #34a853;
  --green-100: #e4f5ea;

  --amber: #f3a738;

  --ink:    #15233a;
  --muted:  #5a6b82;
  --line:   #e2e9f2;
  --bg:     #ffffff;
  --bg-soft:#f6f9fd;
  --white:  #ffffff;

  --radius: 16px;
  --radius-sm: 11px;
  --shadow-sm: 0 1px 2px rgba(16,58,115,.06), 0 4px 14px rgba(16,58,115,.06);
  --shadow-md: 0 10px 30px rgba(16,58,115,.12);
  --shadow-lg: 0 24px 60px rgba(12,44,87,.18);

  --ff-head: "Plus Jakarta Sans", system-ui, sans-serif;
  --ff-body: "Inter", system-ui, sans-serif;

  --maxw: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--ff-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }

h1, h2, h3, h4 {
  font-family: var(--ff-head);
  line-height: 1.15;
  letter-spacing: -.01em;
  margin: 0 0 .5em;
  color: var(--ink);
}

a { color: var(--blue-700); text-decoration: none; }
a:hover { text-decoration: underline; }

p { margin: 0 0 1em; }

address { font-style: normal; }

.container {
  width: min(100% - 2.4rem, var(--maxw));
  margin-inline: auto;
}

.ic { width: 1.25em; height: 1.25em; display: inline-block; vertical-align: -.18em; }

/* Accessibilité : focus visible */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--blue-500);
  outline-offset: 2px;
  border-radius: 6px;
}

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--blue-700); color: #fff; padding: .7rem 1rem;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; }

/* ============ BUTTONS ============ */
.btn {
  --b: var(--blue-700);
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--ff-head); font-weight: 700; font-size: .98rem;
  padding: .85rem 1.4rem; border-radius: 999px;
  border: 1.5px solid transparent; cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  text-decoration: none; white-space: nowrap; line-height: 1;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  color: #fff; box-shadow: 0 8px 20px rgba(31,95,176,.35);
}
.btn-primary:hover { box-shadow: 0 12px 26px rgba(31,95,176,.45); color:#fff; }
.btn-primary:disabled { opacity: .7; cursor: default; transform: none; }
.btn-ghost {
  background: rgba(255,255,255,.85); color: var(--blue-800);
  border-color: var(--blue-100);
}
.btn-ghost:hover { background: #fff; }
.btn-sm { padding: .6rem 1.05rem; font-size: .9rem; }
.btn-block { width: 100%; justify-content: center; }

/* ============ HEADER ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 1rem;
  min-height: 70px;
}
.brand { display: flex; align-items: center; gap: .65rem; }
.brand:hover { text-decoration: none; }
.brand-mark svg { display: block; border-radius: 11px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-text strong {
  font-family: var(--ff-head); font-weight: 800; font-size: 1.3rem;
  color: var(--blue-900); letter-spacing: .02em;
}
.brand-text small { color: var(--muted); font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }

.main-nav { display: none; gap: 1.4rem; margin-left: 1.4rem; }
.main-nav a {
  color: var(--ink); font-weight: 600; font-size: .96rem;
  padding: .35rem 0; position: relative;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--blue-600); transition: width .2s ease;
}
.main-nav a:hover { text-decoration: none; }
.main-nav a:hover::after,
.main-nav a[aria-current="true"]::after { width: 100%; }
.main-nav a[aria-current="true"] { color: var(--blue-700); }

.header-actions { display: flex; align-items: center; gap: .6rem; margin-left: auto; }
.phone-link {
  display: none; align-items: center; gap: .4rem;
  font-family: var(--ff-head); font-weight: 700; color: var(--blue-800);
  font-size: .98rem;
}
.phone-link .ic { color: var(--green-600); }
.phone-link:hover { text-decoration: none; color: var(--blue-600); }

.burger {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 40px; padding: 0 9px; background: var(--blue-50);
  border: 1px solid var(--line); border-radius: 11px; cursor: pointer;
}
.burger span { height: 2.5px; background: var(--blue-800); border-radius: 2px; transition: .25s; }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* mobile nav panel */
.main-nav.open {
  display: flex; flex-direction: column; gap: 0;
  position: absolute; top: 100%; left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--line);
  padding: .5rem 1.2rem 1rem; margin: 0;
  box-shadow: var(--shadow-md);
}
.main-nav.open a { padding: .85rem .2rem; border-bottom: 1px solid var(--line); }
.main-nav.open a:last-child { border-bottom: none; }

/* ============ HERO ============ */
.hero { position: relative; overflow: hidden; background: var(--bg-soft); }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(900px 480px at 88% -10%, rgba(52,168,83,.12), transparent 60%),
    radial-gradient(900px 560px at 8% 0%, rgba(31,95,176,.16), transparent 55%),
    linear-gradient(180deg, #fff, var(--bg-soft));
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px; opacity: .35;
  -webkit-mask-image: radial-gradient(700px 380px at 70% 30%, #000, transparent 75%);
          mask-image: radial-gradient(700px 380px at 70% 30%, #000, transparent 75%);
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; gap: 2.2rem;
  padding: 2.6rem 0 3rem;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-weight: 700; font-size: .82rem; letter-spacing: .04em; text-transform: uppercase;
  color: var(--blue-700); background: #fff; border: 1px solid var(--blue-100);
  padding: .4rem .8rem; border-radius: 999px; box-shadow: var(--shadow-sm);
}
.eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green-500); box-shadow: 0 0 0 4px var(--green-100); }

.hero-copy h1 {
  font-size: clamp(2rem, 6vw, 3.3rem); font-weight: 800;
  margin: 1rem 0 .7rem; color: var(--blue-900);
}
.hl { color: var(--green-600); position: relative; white-space: nowrap; }
.hl::after { content:""; position:absolute; left:-2px; right:-2px; bottom: 4px; height: .32em; background: var(--green-100); z-index: -1; border-radius: 4px; }
.hl-green { color: var(--green-600); }

.lead { font-size: 1.12rem; color: var(--muted); max-width: 36rem; }
.lead strong { color: var(--ink); }

.hero-cta { display: flex; flex-wrap: wrap; gap: .8rem; margin: 1.4rem 0; }

.hero-badges { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.4rem; }

/* ---- BADGES CERTIF ---- */
.cert-badge {
  display: inline-flex; align-items: center; gap: .6rem;
  background: #fff; border-radius: 14px; padding: .6rem .85rem;
  box-shadow: var(--shadow-sm); border: 1px solid var(--line);
}
.cert-badge .cert-ic { width: 30px; height: 30px; color: #fff; padding: 6px; border-radius: 9px; flex: none; }
.cert-badge .cert-txt { display: flex; flex-direction: column; line-height: 1.1; }
.cert-badge .cert-txt strong { font-family: var(--ff-head); font-weight: 800; font-size: .98rem; letter-spacing: .03em; }
.cert-badge .cert-txt small { color: var(--muted); font-size: .7rem; }
.cert-qualibat { border-color: rgba(31,95,176,.25); }
.cert-qualibat .cert-ic { background: linear-gradient(135deg, var(--blue-600), var(--blue-800)); }
.cert-qualibat .cert-txt strong { color: var(--blue-800); }
.cert-rge { border-color: rgba(42,162,87,.3); }
.cert-rge .cert-ic { background: linear-gradient(135deg, var(--green-500), var(--green-700)); }
.cert-rge .cert-txt strong { color: var(--green-700); }

/* hero art */
.hero-art { position: relative; }
.hero-svg { display: block; filter: drop-shadow(0 30px 50px rgba(12,44,87,.18)); }
.hero-stat {
  position: absolute; right: 4%; bottom: 2%;
  background: var(--blue-900); color: #fff; border-radius: 14px;
  padding: .7rem 1rem; box-shadow: var(--shadow-md);
  display: flex; flex-direction: column; line-height: 1.1; max-width: 12rem;
}
.hero-stat strong { font-family: var(--ff-head); font-size: 1.3rem; font-weight: 800; }
.hero-stat span { font-size: .76rem; opacity: .85; }

/* ============ TRUST STRIP ============ */
.trust-strip { background: var(--blue-900); color: #fff; }
.trust-inner {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: .8rem 1rem;
  padding: 1.1rem 0;
}
.trust-item {
  display: flex; align-items: center; gap: .55rem;
  font-family: var(--ff-head); font-weight: 700; font-size: .95rem;
}
.trust-item .ic { color: var(--green-500); }

/* ============ SECTIONS ============ */
.section { padding: 3.4rem 0; }
.section-head { max-width: 42rem; margin: 0 auto 2.2rem; text-align: center; }
.kicker {
  font-family: var(--ff-head); font-weight: 700; font-size: .8rem;
  text-transform: uppercase; letter-spacing: .08em; color: var(--blue-600);
  margin: 0 0 .5rem;
}
.kicker.light { color: #aecbf0; }
.section-head h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); }
.section-sub { color: var(--muted); font-size: 1.05rem; margin: 0; }
.section-sub.light { color: #cfe0f5; }

/* ============ SERVICE CARDS ============ */
.cards {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1.1rem; grid-template-columns: 1fr;
}
.card {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.6rem 1.4rem;
  box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--blue-100); }
.card-ic {
  display: inline-flex; width: 54px; height: 54px; padding: 13px;
  border-radius: 14px; color: var(--blue-700);
  background: linear-gradient(135deg, var(--blue-50), var(--blue-100));
  margin-bottom: 1rem;
}
.card-ic svg { width: 100%; height: 100%; }
.card-ic.eco { color: var(--green-700); background: linear-gradient(135deg, var(--green-100), #cdeed8); }
.card h3 { font-size: 1.18rem; }
.card p { color: var(--muted); margin: 0; font-size: .97rem; }
.card-feature {
  border: 1.5px solid var(--green-500);
  background: linear-gradient(180deg, #fff, var(--green-100));
  box-shadow: 0 12px 30px rgba(42,162,87,.15);
}
.ribbon {
  position: absolute; top: 1rem; right: 1rem;
  background: var(--green-600); color: #fff;
  font-family: var(--ff-head); font-weight: 700; font-size: .68rem;
  letter-spacing: .03em; padding: .3rem .6rem; border-radius: 999px;
  box-shadow: 0 4px 10px rgba(42,162,87,.35);
}

/* ============ CERTIFICATIONS SECTION ============ */
.section-cert {
  background:
    radial-gradient(700px 400px at 90% 0%, rgba(52,168,83,.18), transparent 60%),
    linear-gradient(135deg, var(--blue-800), var(--blue-900));
  color: #fff;
}
.section-cert h2, .section-cert .kicker { color: #fff; }
.cert-grid { display: grid; gap: 2.2rem; }
.cert-benefits { list-style: none; margin: 1.6rem 0 0; padding: 0; display: grid; gap: 1rem; }
.cert-benefits li { display: flex; gap: .9rem; align-items: flex-start; }
.cert-benefits .ic {
  flex: none; width: 40px; height: 40px; padding: 9px; border-radius: 11px;
  background: rgba(255,255,255,.12); color: #b6f0c8;
}
.cert-benefits strong { display: block; font-family: var(--ff-head); font-size: 1.05rem; }
.cert-benefits span { color: #cfe0f5; font-size: .95rem; }

.cert-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-content: start; }
.cert-card.big {
  background: #fff; border-radius: var(--radius); padding: 1.5rem 1rem;
  display: flex; flex-direction: column; align-items: center; text-align: center;
  gap: .35rem; box-shadow: var(--shadow-lg);
}
.cert-card.big .cert-ic { width: 56px; height: 56px; padding: 12px; border-radius: 16px; color: #fff; }
.cert-card.big strong { font-family: var(--ff-head); font-weight: 800; font-size: 1.35rem; letter-spacing: .03em; }
.cert-card.big small { color: var(--muted); font-size: .76rem; }
.cert-card.cert-qualibat .cert-ic { background: linear-gradient(135deg, var(--blue-600), var(--blue-800)); }
.cert-card.cert-qualibat strong { color: var(--blue-800); }
.cert-card.cert-rge .cert-ic { background: linear-gradient(135deg, var(--green-500), var(--green-700)); }
.cert-card.cert-rge strong { color: var(--green-700); }
.cert-note {
  grid-column: 1 / -1; display: flex; gap: .7rem; align-items: center;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18);
  border-radius: 14px; padding: .9rem 1rem; font-size: .95rem; color: #eaf3ff;
}
.cert-note .ic { color: var(--amber); flex: none; width: 26px; height: 26px; }

/* ============ POURQUOI ============ */
.why-grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.1rem; grid-template-columns: 1fr; }
.why {
  background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.4rem; position: relative;
}
.why-num {
  font-family: var(--ff-head); font-weight: 800; font-size: 1.6rem;
  color: var(--blue-100); -webkit-text-stroke: 1px var(--blue-500);
  display: block; margin-bottom: .3rem;
}
.why h3 { font-size: 1.1rem; }
.why p { margin: 0; color: var(--muted); font-size: .95rem; }

/* ============ ZONE ============ */
.section-zone { background: var(--bg-soft); }
.zone-inner { display: grid; gap: 2rem; align-items: center; }
.zone-tags { list-style: none; margin: 1.3rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: .55rem; }
.zone-tags li {
  background: #fff; border: 1px solid var(--blue-100); color: var(--blue-800);
  font-weight: 600; font-size: .9rem; padding: .45rem .85rem; border-radius: 999px;
  box-shadow: var(--shadow-sm);
}
.zone-map .map-svg { display: block; border-radius: var(--radius); box-shadow: var(--shadow-md); }

/* ============ CONTACT ============ */
.section-contact { background: linear-gradient(180deg, #fff, var(--bg-soft)); }
.contact-grid { display: grid; gap: 2.2rem; }
.contact-info { list-style: none; margin: 1.4rem 0 0; padding: 0; display: grid; gap: 1rem; }
.contact-info li { display: flex; gap: .9rem; align-items: flex-start; }
.contact-info .ic {
  flex: none; width: 42px; height: 42px; padding: 10px; border-radius: 12px;
  background: var(--blue-50); color: var(--blue-700);
}
.contact-info span:first-child,
.contact-info div > span { display: block; font-weight: 700; font-family: var(--ff-head); color: var(--ink); font-size: .92rem; }
.contact-info a, .contact-info address, .hours { color: var(--muted); font-size: .98rem; }
.contact-info a:hover { color: var(--blue-600); }
.hours { margin: 0; }

.contact-form {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.6rem; box-shadow: var(--shadow-md);
}
.field { margin-bottom: 1rem; }
.field-row { display: grid; gap: 1rem; grid-template-columns: 1fr; }
.field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: .35rem; color: var(--ink); }
.field label span { color: #d9534f; }
.field input, .field select, .field textarea {
  width: 100%; padding: .8rem .9rem; border: 1.5px solid var(--line);
  border-radius: var(--radius-sm); font: inherit; color: var(--ink);
  background: var(--bg-soft); transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.field input::placeholder, .field textarea::placeholder { color: #9aa9bd; }
.field input:focus, .field select:focus, .field textarea:focus {
  background: #fff; border-color: var(--blue-500);
  box-shadow: 0 0 0 4px rgba(47,116,207,.14); outline: none;
}
.field textarea { resize: vertical; }
.field input:invalid:not(:placeholder-shown) { border-color: #d9534f; }
.form-note { font-size: .82rem; color: var(--muted); text-align: center; margin: .8rem 0 0; }
.form-success {
  margin-top: 1rem; display: flex; gap: .7rem; align-items: center;
  background: var(--green-100); border: 1px solid var(--green-500);
  border-radius: var(--radius-sm); padding: 1rem; color: var(--green-700);
}
.form-success .ic { flex: none; width: 30px; height: 30px; padding: 5px; background: var(--green-600); color: #fff; border-radius: 50%; }
.form-success p { margin: 0; font-size: .95rem; }
.form-success strong { color: var(--green-700); }

/* ============ FOOTER ============ */
.site-footer { background: var(--blue-900); color: #cfe0f5; }
.footer-inner {
  display: grid; gap: 1.8rem; grid-template-columns: 1fr;
  padding: 3rem 0 2rem;
}
.footer-brand strong { font-family: var(--ff-head); font-weight: 800; font-size: 1.5rem; color: #fff; letter-spacing: .02em; display: block; margin-bottom: .5rem; }
.footer-brand p { font-size: .92rem; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: .8rem; }
.footer-col a, .footer-col address { display: block; color: #cfe0f5; font-size: .92rem; margin-bottom: .4rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding: 1.2rem 0; display: flex; flex-direction: column; gap: .4rem;
  font-size: .85rem; color: #9fbce4;
}
.footer-bottom .credit strong { color: #fff; }

/* ============ RESPONSIVE ============ */
@media (min-width: 560px) {
  .trust-inner { grid-template-columns: repeat(4, 1fr); }
  .field-row { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
}

@media (min-width: 760px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1.6fr 1fr 1fr; }
  .section { padding: 4.4rem 0; }
}

@media (min-width: 960px) {
  .main-nav { display: flex; }
  .phone-link { display: inline-flex; }
  .burger { display: none; }
  .hero-inner { grid-template-columns: 1.05fr .95fr; align-items: center; padding: 4rem 0 4.5rem; }
  .cards { grid-template-columns: repeat(3, 1fr); }
  .cert-grid { grid-template-columns: 1.1fr .9fr; align-items: center; }
  .contact-grid { grid-template-columns: .9fr 1.1fr; align-items: start; }
  .zone-inner { grid-template-columns: 1fr 1fr; }
}

/* Préférence mouvement réduit */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}