/* ===== Alpen Construct — Feuille de style principale ===== */

:root {
  --color-forest: #1f3329;
  --color-forest-dark: #142019;
  --color-red: #1a1a1a;
  --color-red-dark: #0d0d0d;
  --color-stone: #4a4a45;
  --color-stone-light: #f4f2ee;
  --color-wood: #8a5a3c;
  --color-wood-dark: #6e4630;
  --color-cream: #faf8f5;
  --color-white: #ffffff;
  --color-text: #2b2b28;
  --color-text-light: #6b6b64;
  --shadow-soft: 0 10px 30px rgba(20, 32, 25, 0.08);
  --shadow-strong: 0 20px 45px rgba(20, 32, 25, 0.18);
  --radius: 6px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-cream);
  line-height: 1.65;
}

h1, h2, h3, h4 {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-forest);
  line-height: 1.2;
  font-weight: 600;
}

h1 { font-size: 2.8rem; }
h2 { font-size: 2.1rem; margin-bottom: 1rem; }
h3 { font-size: 1.35rem; margin-bottom: 0.6rem; }

p { color: var(--color-text-light); }

a {
  text-decoration: none;
  color: inherit;
}

img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 90px 0;
}

.section-alt {
  background: var(--color-white);
}

.section-dark {
  background: var(--color-red);
  color: var(--color-stone-light);
}
.section-dark h2, .section-dark h3 { color: var(--color-white); }
.section-dark p { color: rgba(255, 255, 255, 0.88); }
.section-dark .eyebrow { color: #e0b98f; }
.section-dark .card h3 { color: var(--color-text); }
.section-dark .card p { color: var(--color-text-light); }
.section-dark .value-item h3 { color: var(--color-text); }
.section-dark .value-item p { color: var(--color-text-light); }
.section-dark .project-card h3 { color: var(--color-text); }
.section-dark .project-card p { color: var(--color-text-light); }
.section-dark .project-card .tag { color: var(--color-forest); }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-wood);
  margin-bottom: 12px;
  display: inline-block;
}

.section-header {
  max-width: 640px;
  margin: 0 auto 50px;
  text-align: center;
}

/* ===== Header / Navigation ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 245, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(31, 51, 41, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  padding: 8px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-forest);
  letter-spacing: 0.3px;
  white-space: nowrap;
  flex-shrink: 0;
}
.logo span { color: #ED1C24; }
.logo-mark {
  height: 52px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
  flex-wrap: nowrap;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color 0.2s;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--color-wood);
  border-bottom-color: var(--color-wood);
}
.nav-links a.active {
  color: var(--color-text);
  border-bottom-color: var(--color-wood);
}

.nav-cta {
  background: var(--color-red);
  color: var(--color-white) !important;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-weight: 700;
  white-space: nowrap;
  border-bottom: none !important;
}
.nav-cta:hover {
  background: var(--color-red-dark);
  color: var(--color-white) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 26px;
  height: 2px;
  background: var(--color-forest);
  display: block;
}

/* ===== Hero ===== */

.hero {
  background:
    linear-gradient(90deg, rgba(0,0,0,0.80) 0%, rgba(0,0,0,0.55) 40%, rgba(0,0,0,0.15) 70%, rgba(0,0,0,0) 100%),
    url('hero-bg.jpg') center 40% / cover no-repeat;
  color: var(--color-white);
  padding: 120px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -160px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(138, 90, 60, 0.18);
}

.hero-content {
  max-width: 680px;
  position: relative;
  z-index: 2;
}

.hero .eyebrow { color: #d9b98d; }

.hero h1 {
  color: var(--color-white);
  text-shadow: 0 2px 10px rgba(0,0,0,0.65);
  margin-bottom: 22px;
}

.hero p {
  color: #d9b98d;
  font-weight: 500;
  text-shadow: 0 2px 8px rgba(0,0,0,0.65);
  font-size: 1.12rem;
  margin-bottom: 34px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 30px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-wood);
  color: var(--color-white);
}
.btn-primary:hover {
  background: var(--color-wood-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: var(--color-white);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.12);
}

.btn-dark {
  background: var(--color-red);
  color: var(--color-white);
}
.btn-dark:hover {
  background: var(--color-red-dark);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 50px;
  margin-top: 60px;
  flex-wrap: wrap;
}
.hero-stats div strong {
  font-size: 2rem;
  color: var(--color-white);
  display: block;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
.hero-stats div span {
  font-size: 0.85rem;
  color: rgba(250, 248, 245, 0.7);
}

/* ===== Cards / grids ===== */

.grid {
  display: grid;
  gap: 30px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 36px 30px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(31,51,41,0.06);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-strong);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  background: rgba(138, 90, 60, 0.12);
  color: var(--color-wood);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
  font-weight: 700;
}

.card p { font-size: 0.95rem; }

.card-list {
  list-style: none;
  margin-top: 14px;
}
.card-list li {
  font-size: 0.9rem;
  color: var(--color-text-light);
  padding: 5px 0 5px 20px;
  position: relative;
}
.card-list li::before {
  content: "-";
  position: absolute;
  left: 0;
  color: var(--color-wood);
}

/* ===== Realisations / project cards ===== */

.project-card {
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(31,51,41,0.06);
}

.project-image {
  height: 210px;
  background: linear-gradient(135deg, var(--color-stone) 0%, var(--color-forest) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.55);
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.project-gallery {
  height: 210px;
  display: flex;
  gap: 2px;
}
.project-gallery > div {
  flex: 1;
  background-size: cover;
  background-position: center;
}

.project-meta {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 6px;
}
.project-meta strong { color: var(--color-text); }

.project-body {
  padding: 24px 26px 28px;
}

.tag {
  display: inline-block;
  background: rgba(31,51,41,0.08);
  color: var(--color-forest);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}

/* ===== Timeline / process ===== */

.process-step {
  display: flex;
  gap: 22px;
  padding: 24px 0;
  border-top: 1px solid rgba(31,51,41,0.1);
}
.process-step:first-of-type { border-top: none; }

.process-number {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-wood);
  min-width: 50px;
}

/* ===== About / values ===== */

.values-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  margin-top: 20px;
}
.value-item {
  padding: 22px;
  background: var(--color-stone-light);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-wood);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.split-image {
  height: 380px;
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--color-stone) 0%, var(--color-forest-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ===== Team ===== */

.team-card {
  text-align: center;
}
.team-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--color-stone-light);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-wood);
  font-weight: 700;
  font-size: 1.4rem;
  border: 2px solid rgba(138,90,60,0.25);
}

/* ===== Contact ===== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 26px;
}

.contact-info-icon {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: rgba(138,90,60,0.12);
  color: var(--color-wood);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-forest);
  margin-bottom: 8px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid rgba(31,51,41,0.18);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--color-white);
  color: var(--color-text);
}
.form-group textarea { resize: vertical; min-height: 130px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.form-note {
  font-size: 0.8rem;
  margin-top: 14px;
  color: var(--color-text-light);
}

.form-success {
  display: none;
  background: rgba(31,51,41,0.08);
  border: 1px solid rgba(31,51,41,0.2);
  color: var(--color-forest);
  padding: 16px 18px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

.form-error {
  display: none;
  background: rgba(176, 74, 60, 0.08);
  border: 1px solid rgba(176, 74, 60, 0.3);
  color: #b04a3c;
  padding: 16px 18px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.map-placeholder {
  height: 220px;
  border-radius: var(--radius);
  background: var(--color-stone-light);
  border: 1px dashed rgba(31,51,41,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.85rem;
  margin-top: 30px;
}

/* ===== CTA band ===== */

.cta-band {
  background: var(--color-wood);
  color: var(--color-white);
  text-align: center;
  padding: 70px 0;
}
.cta-band h2 { color: var(--color-white); }
.cta-band p { color: rgba(255,255,255,0.85); margin-bottom: 30px; }

/* ===== Footer ===== */

.site-footer {
  background: var(--color-red-dark);
  color: rgba(250, 248, 245, 0.8);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-grid h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 10px; font-size: 0.9rem; }
.footer-grid a:hover { color: var(--color-wood); }

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 14px;
}
.footer-logo .logo-mark { height: 42px; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== Page header (sous-pages) ===== */

.page-header {
  background:
    linear-gradient(rgba(0,0,0,0.60), rgba(0,0,0,0.60)),
    url('hero-bg.jpg') center 40% / cover no-repeat;
  color: var(--color-white);
  padding: 70px 0 60px;
  text-align: center;
}
.page-header h1 { color: var(--color-white); margin-bottom: 10px; }
.page-header p { color: rgba(255,255,255,0.75); max-width: 560px; margin: 0 auto; }

/* ===== Responsive ===== */

@media (max-width: 900px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .values-list { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  h1 { font-size: 2.1rem; }

  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-cream);
    flex-direction: column;
    gap: 0;
    padding: 10px 24px 20px;
    display: none;
    border-bottom: 1px solid rgba(31,51,41,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 0; border-bottom: 1px solid rgba(31,51,41,0.06); }
  .nav-toggle { display: flex; }
  .hero-stats { gap: 30px; }
}

@media (max-width: 600px) {
  .section { padding: 60px 0; }
  .hero { padding: 90px 0 70px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}