/* ============================================
   Structura - Bureau d'études structure
   Styles CSS statiques
   ============================================ */

:root {
  /* Couleurs */
  --navy-900: #0f172a;
  --navy-800: #1e293b;
  --navy-700: #334155;
  --navy-600: #475569;
  --navy-100: #f1f5f9;
  --navy-50: #f8fafc;
  --accent: #f97316;
  --accent-dark: #ea580c;
  --accent-light: #fff7ed;
  --white: #ffffff;
  --success: #16a34a;
  --error: #dc2626;

  /* Typo */
  --font-heading: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  /* Espacements */
  --section-py: 7rem;
  --container-max: 1200px;
  --container-px: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Ombres */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.08);
  --shadow-xl: 0 20px 40px -10px rgba(15, 23, 42, 0.2);

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
}

/* Reset de base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--navy-700);
  background-color: var(--white);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Typographie */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  color: var(--navy-900);
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.35rem); }
h4 { font-size: 1.1rem; }

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-px);
  padding-right: var(--container-px);
}

/* Grille */
.grid {
  display: grid;
  gap: 1.5rem;
}

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

@media (max-width: 992px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
}

/* Cartes */
.card {
  background: var(--white);
  border: 1px solid var(--navy-100);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card--hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card--cta {
  background: var(--navy-900);
  color: var(--navy-100);
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  border: none;
}

.card--cta h3 {
  color: var(--white);
}

.card--cta .btn {
  margin-top: 1.5rem;
}

/* Boutons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.btn--primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.btn--outline {
  background: transparent;
  border-color: var(--navy-700);
  color: var(--navy-700);
}

.btn--outline:hover {
  background: var(--navy-700);
  color: var(--white);
}

.btn--outline.btn--light {
  border-color: var(--white);
  color: var(--white);
}

.btn--outline.btn--light:hover {
  background: var(--white);
  color: var(--navy-900);
}

.btn--small {
  padding: 0.6rem 1.25rem;
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.btn--small:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.btn--block {
  width: 100%;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
  padding: 1rem 0;
}

.header.is-scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  padding: 0.75rem 0;
}

.header.is-scrolled .nav__link {
  color: var(--navy-700);
}

.header.is-scrolled .logo__text {
  color: var(--navy-900);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
}

.logo__mark {
  width: 4rem;
  height: 4rem;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.logo__text {
  color: var(--white);
  transition: color var(--transition-base);
  font-size: 2rem;
}
.logo__text2 {
  color: var(--white);
  transition: color var(--transition-base);
  font-size: 1.5rem;
}

.logo--light .logo__text .logo__text2 {
  color: var(--white);
}

/* Navigation */
.nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__link {
  color: var(--white);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-fast);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  width: 100%;
}

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  z-index: 1001;
}

.burger__line {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--white);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header.is-scrolled .burger__line,
.nav.is-open + .burger .burger__line {
  background: var(--navy-900);
}

@media (max-width: 768px) {
  .burger {
    display: flex;
  }

  .nav {
    position: fixed;
    inset: 0 0 0 30%;
    background: var(--white);
    padding: 6rem 2rem 2rem;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-xl);
  }

  .nav.is-open {
    transform: translateX(0);
  }

  .nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .nav__link {
    color: var(--navy-900);
    font-size: 1.15rem;
  }

  .burger.is-active .burger__line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .burger.is-active .burger__line:nth-child(2) {
    opacity: 0;
  }

  .burger.is-active .burger__line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  color: var(--white);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.6) 50%, rgba(15, 23, 42, 0.4) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-top: 7rem;
  padding-bottom: 5rem;
  max-width: 900px;
}

.hero__eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: clamp(2.5rem, 3vw, 3.5rem);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero__title {
  color: var(--white);
  margin-bottom: 1.25rem;
  font-weight: 700;
  font-size: clamp(2.2rem, 4vw, 2.8rem);
}

.hero__subtitle {
  font-size: clamp(1rem, 1vw, 1.2rem);
  color: rgba(255, 255, 255, 0.85);
  max-width: 620px;
  margin-bottom: 2rem;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  backdrop-filter: blur(4px);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero__trust {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
}

.trust__item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--white);
  font-weight: 500;
}

.trust__item::before {
  content: "✓";
  color: var(--accent);
  font-weight: 700;
}

.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 64px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  display: grid;
  place-items: center;
}

.scroll-down__icon {
  width: 6px;
  height: 12px;
  background: var(--white);
  border-radius: 999px;
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(-6px); opacity: 0.6; }
  50% { transform: translateY(6px); opacity: 1; }
}

@media (max-width: 640px) {
  .hero__content {
    padding-top: 6rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .scroll-down {
    display: none;
  }
}

/* Sections */
.section {
  padding: var(--section-py) 0;
}

.section--intro {
  background: var(--navy-50);
}

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

.section--realisations {
  background: var(--navy-50);
}

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

.section__header {
  max-width: 700px;
  margin-bottom: 3.5rem;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section__header--split {
  max-width: 100%;
  text-align: left;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: end;
}

.section__eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section__title {
  margin-bottom: 1rem;
}

.section__desc {
  font-size: 1.05rem;
  color: var(--navy-600);
}

@media (max-width: 768px) {
  .section__header--split {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .section {
    --section-py: 4rem;
  }
}

/* Features */
.features {
  margin-top: 2rem;
}

.feature__text {
  text-align: left;
}
.feature {
  text-align: center;
}
.feature__icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 1.25rem;
  display: grid;
  place-items: center;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-lg);
}

.feature__title {
  margin-bottom: 0.75rem;
}

.feature__text {
  font-size: 0.95rem  
  color: var(--navy-600); 
}

/* Services */
.services {
  align-items: stretch;
}

.service {
  position: relative;
}

.service__number {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.4;
}

.service__title {
  margin-bottom: 0.75rem;
  padding-right: 2rem;
}

.service__text {
  color: var(--navy-600);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.service__list {
  padding-left: 1.25rem;
  border-left: 2px solid var(--accent-light);
}

.service__list li {
  position: relative;
  padding-left: 0.75rem;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  color: var(--navy-700);
}

.service__list li::before {
  content: "";
  position: absolute;
  left: -1.35rem;
  top: 0.5rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* Filtres */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter {
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--white);
  border: 1px solid var(--navy-100);
  color: var(--navy-600);
  transition: var(--transition-fast);
}

.filter:hover,
.filter.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

/* Projets */
.projects {
  align-items: stretch;
}

.project {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--navy-100);
}

.project:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.project.is-hidden {
  display: none;
}

.project__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.project__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project:hover .project__media img {
  transform: scale(1.05);
}

.project__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.project:hover .project__overlay {
  opacity: 1;
}

.project__link {
  padding: 0.75rem 1.5rem;
  background: var(--white);
  color: var(--navy-900);
  border-radius: var(--radius-md);
  font-weight: 600;
  transform: translateY(10px);
  transition: transform var(--transition-base), background var(--transition-fast);
}

.project:hover .project__link {
  transform: translateY(0);
}

.project__link:hover {
  background: var(--accent);
  color: var(--white);
}

.project__content {
  padding: 1.5rem;
}

.project__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.project__title {
  margin-bottom: 0.5rem;
}

.project__text {
  font-size: 0.95rem;
  color: var(--navy-600);
}

/* Contact */
.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact__info {
  position: sticky;
  top: 7rem;
}

.contact__address {
  margin-top: 2rem;
  font-style: normal;
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact__icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.contact__item strong {
  display: block;
  color: var(--navy-900);
  margin-bottom: 0.2rem;
}

.contact__item a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.contact__form {
  padding: 2.5rem;
}

.form__group {
  margin-bottom: 1.25rem;
}

.form__label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--navy-900);
  margin-bottom: 0.5rem;
}

.form__input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--navy-100);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  color: var(--navy-900);
  background: var(--navy-50);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input::placeholder {
  color: var(--navy-600);
  opacity: 0.6;
}

.form__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.15);
  background: var(--white);
}

.form__input--textarea {
  resize: vertical;
  min-height: 130px;
}

.form__notice {
  margin-top: 1rem;
  font-size: 0.95rem;
  font-weight: 500;
  min-height: 1.5rem;
}

.form__notice.is-success {
  color: var(--success);
}

.form__notice.is-error {
  color: var(--error);
}

@media (max-width: 992px) {
  .contact {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact__info {
    position: static;
  }

  .contact__form {
    padding: 1.5rem;
  }
}

/* Footer */
.footer {
  background: var(--navy-900);
  color: var(--navy-100);
  padding: 4rem 0 1.5rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer__text {
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--navy-100);
  opacity: 0.8;
  max-width: 300px;
}

.footer__title {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.footer__nav ul,
.footer__legal ul {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer a {
  color: var(--navy-100);
  opacity: 0.8;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.footer a:hover {
  opacity: 1;
  color: var(--accent);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.7;
}

@media (max-width: 992px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Accessibilité */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .scroll-down__icon {
    animation: none;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}