/* =============================================
   ADSP SUREL — Plombier Chauffagiste
   styles.css — mobile-first
   ============================================= */

:root {
  --color-primary: #1a4f8a;
  --color-primary-dark: #123a68;
  --color-accent: #e07020;
  --color-accent-dark: #c05c10;
  --color-text: #1e2a38;
  --color-text-light: #5a6778;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fb;
  --color-border: #dde3ec;
  --color-white: #ffffff;

  --font-base: system-ui, 'Segoe UI', Arial, sans-serif;
  --font-size-base: 1rem;
  --line-height: 1.65;

  --radius: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(26,79,138,.08);
  --shadow-md: 0 6px 24px rgba(26,79,138,.12);

  --container: 1160px;
  --gap: 1.5rem;
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--line-height);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
address { font-style: normal; }

/* ---- CONTAINER ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .15s;
  border: 2px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.btn--primary:hover { background: var(--color-accent-dark); border-color: var(--color-accent-dark); }
.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,.7);
}
.btn--outline:hover { background: rgba(255,255,255,.12); }
.btn--full { width: 100%; justify-content: center; }

/* ---- SECTION SHARED ---- */
.section { padding-block: 4rem; }
.section--alt { background: var(--color-bg-alt); }
.section__header { text-align: center; margin-bottom: 3rem; }
.section__label {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: .5rem;
}
.section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.25;
  margin-bottom: .75rem;
}
.section__desc {
  color: var(--color-text-light);
  max-width: 600px;
  margin-inline: auto;
}

/* =============================================
   HEADER
   ============================================= */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 1rem;
}
.header__logo { display: flex; flex-direction: column; line-height: 1.2; }
.logo__name {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -.01em;
}
.logo__subtitle { font-size: .72rem; color: var(--color-text-light); font-weight: 500; }

/* Nav desktop */
.nav__list {
  display: none;
  gap: 1.75rem;
  align-items: center;
}
.nav__list a {
  font-weight: 500;
  font-size: .92rem;
  color: var(--color-text);
  transition: color .2s;
}
.nav__list a:hover { color: var(--color-primary); }
.nav__cta {
  background: var(--color-accent) !important;
  color: var(--color-white) !important;
  padding: .45rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 600 !important;
}
.nav__cta:hover { background: var(--color-accent-dark) !important; }

/* Hamburger */
.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav open */
.nav.is-open .nav__list {
  display: flex;
  flex-direction: column;
  position: fixed;
  inset: 68px 0 0 0;
  background: var(--color-white);
  padding: 2rem 1.25rem;
  gap: 1.25rem;
  border-top: 1px solid var(--color-border);
}

/* =============================================
   HERO
   ============================================= */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, #2563a8 100%);
  color: var(--color-white);
  padding-block: 5rem 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}
.hero__inner { position: relative; }
.hero__label {
  display: inline-block;
  background: rgba(255,255,255,.15);
  color: rgba(255,255,255,.9);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .3rem .9rem;
  border-radius: 100px;
  margin-bottom: 1.25rem;
}
.hero__title {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}
.hero__desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,.85);
  max-width: 580px;
  margin-bottom: 2rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 2rem; }
.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}
.hero__badges li {
  background: rgba(255,255,255,.12);
  color: rgba(255,255,255,.9);
  font-size: .82rem;
  font-weight: 600;
  padding: .3rem .85rem;
  border-radius: 100px;
  border: 1px solid rgba(255,255,255,.2);
}

/* =============================================
   SERVICES
   ============================================= */
.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}
.service-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: box-shadow .25s, transform .25s;
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.service-card__icon {
  font-size: 2.25rem;
  margin-bottom: 1rem;
  display: block;
}
.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: .5rem;
}
.service-card p { color: var(--color-text-light); margin-bottom: 1rem; font-size: .95rem; }
.service-card__list { display: flex; flex-direction: column; gap: .35rem; }
.service-card__list li {
  font-size: .88rem;
  color: var(--color-text);
  padding-left: 1.1rem;
  position: relative;
}
.service-card__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: .8rem;
}

/* =============================================
   ABOUT
   ============================================= */
.about__inner {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}
.about__content { display: flex; flex-direction: column; gap: 1rem; }
.about__content .section__title { text-align: left; margin-bottom: 0; }
.about__content p { color: var(--color-text-light); }
.about__content p strong { color: var(--color-text); }
.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.stat-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.stat-card__number {
  display: block;
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: .35rem;
}
.stat-card__label { font-size: .82rem; color: var(--color-text-light); font-weight: 500; }

/* =============================================
   WHY / CERTIFICATIONS
   ============================================= */
.why__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}
.why-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.why-card__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
  text-align: center;
  border-radius: var(--radius);
  line-height: 1.2;
  align-self: flex-start;
}
.why-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--color-text); }
.why-card p { color: var(--color-text-light); font-size: .93rem; }

/* =============================================
   CONTACT
   ============================================= */
.contact__inner {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}
.contact__info { display: flex; flex-direction: column; gap: 1rem; }
.contact__info .section__title { text-align: left; margin-bottom: 0; }
.contact__info p { color: var(--color-text-light); }
.contact__agencies { display: flex; flex-direction: column; gap: 1.25rem; margin-top: .5rem; }
.agency {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.agency h3 { font-size: .95rem; font-weight: 700; color: var(--color-primary); margin-bottom: .4rem; }
.agency address { color: var(--color-text-light); font-size: .9rem; margin-bottom: .5rem; }
.contact__phone {
  display: inline-block;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-accent);
}
.contact__phone:hover { text-decoration: underline; }

/* Form */
.contact__form {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form__row { display: flex; flex-direction: column; gap: 1rem; }
.form__group { display: flex; flex-direction: column; gap: .4rem; }
.form__group label { font-size: .88rem; font-weight: 600; color: var(--color-text); }
.form__group input,
.form__group select,
.form__group textarea {
  padding: .7rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-base);
  font-size: .95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color .2s;
  width: 100%;
  appearance: none;
}
.form__group input:focus,
.form__group select:focus,
.form__group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}
.form__group textarea { resize: vertical; }
.form__notice { font-size: .8rem; color: var(--color-text-light); text-align: center; }

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,.75);
}
.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-block: 3rem;
}
.footer__brand { display: flex; flex-direction: column; gap: .5rem; }
.footer__brand .logo__name { color: var(--color-white); font-size: 1.1rem; }
.footer__brand .logo__subtitle { color: rgba(255,255,255,.5); }
.footer__brand p { font-size: .88rem; max-width: 280px; }

.footer__nav h4,
.footer__contact h4 {
  color: var(--color-white);
  font-size: .88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: .75rem;
}
.footer__nav ul { display: flex; flex-direction: column; gap: .5rem; }
.footer__nav a { font-size: .9rem; transition: color .2s; }
.footer__nav a:hover { color: var(--color-white); }
.footer__contact p { font-size: .9rem; margin-bottom: .35rem; }
.footer__contact a:hover { color: var(--color-accent); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-block: 1.25rem;
}
.footer__bottom .container {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  text-align: center;
}
.footer__bottom p { font-size: .82rem; }
.footer__certifs { color: rgba(255,255,255,.45); font-size: .78rem; }

/* =============================================
   RESPONSIVE — Tablet 640px+
   ============================================= */
@media (min-width: 640px) {
  .services__grid { grid-template-columns: 1fr 1fr; }
  .why__grid { grid-template-columns: 1fr 1fr; }
  .form__row { flex-direction: row; }
  .contact__agencies { flex-direction: row; }
  .footer__inner { flex-direction: row; flex-wrap: wrap; gap: 2.5rem; }
  .footer__brand { flex: 1 1 220px; }
  .footer__bottom .container { flex-direction: row; justify-content: space-between; }
}

/* =============================================
   RESPONSIVE — Desktop 900px+
   ============================================= */
@media (min-width: 900px) {
  .nav__list { display: flex; }
  .nav__toggle { display: none; }
  .services__grid { grid-template-columns: repeat(4, 1fr); }
  .why__grid { grid-template-columns: repeat(3, 1fr); }
  .about__inner { flex-direction: row; align-items: center; gap: 4rem; }
  .about__content { flex: 1; }
  .about__stats { flex: 0 0 300px; }
  .contact__inner { flex-direction: row; align-items: flex-start; gap: 4rem; }
  .contact__info { flex: 1; }
  .contact__form { flex: 1; }
  .contact__agencies { flex-direction: column; }
}