/*
  Base stylesheet shared by every page: design tokens, reset, header/nav,
  footer, buttons and generic form fields. Page-specific stylesheets
  (index.css, service.css, projet.css, avis.css, contacte.css, legal.css)
  are loaded after this file and only contain styles unique to that page.
*/

:root {
  --bg: #F7F8FC;
  --surface: #FFFFFF;
  --surface-alt: #F0F2FA;
  --surface-translucent: rgba(255, 255, 255, 0.92);
  --accent: #4F46E5;
  --accent-solid: #4F46E5;
  --accent-hover: #4338CA;
  --accent-soft: rgba(79, 70, 229, 0.08);
  --on-accent: #FFFFFF;
  --text-muted: #5B6178;
  --text: #12162B;
  --border: #9DA4C0;
  --shadow: rgba(18, 22, 43, 0.08);
  --error: #DC2626;
  --success: #15803D;
  --footer-bg: #0B0E1D;
  --footer-text: #949CBA;
  --font-heading: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "DM Sans", system-ui, -apple-system, "Segoe UI", sans-serif;

  /* Spacing scale (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Typography scale */
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.875rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;

  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.6;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Radius scale */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 999px;

  /* Elevation scale */
  --shadow-xs: 0 1px 2px var(--shadow);
  --shadow-sm: 0 2px 8px -2px var(--shadow);
  --shadow-md: 0 12px 28px -10px var(--shadow);
  --shadow-lg: 0 24px 64px -20px var(--shadow);

  --touch-target: 44px;
}

[data-theme="dark"] {
  --bg: #0B0E1B;
  --surface: #141A2E;
  --surface-alt: #1A2138;
  --surface-translucent: rgba(20, 26, 46, 0.92);
  --accent: #818CF8;
  --accent-solid: #4F46E5;
  --accent-hover: #4338CA;
  --accent-soft: rgba(129, 140, 248, 0.16);
  --on-accent: #FFFFFF;
  --text-muted: #9AA2C0;
  --text: #F2F4FC;
  --border: #525C82;
  --shadow: rgba(0, 0, 0, 0.4);
  --error: #F87171;
  --success: #4ADE80;
  --footer-bg: #05070F;
  --footer-text: #838BAA;
}

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

*,
*::before,
*::after {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100svh;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  background: var(--bg);
  color: var(--text);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  text-wrap: balance;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--accent-solid);
  color: var(--on-accent);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  z-index: 100;
  text-decoration: none;
  transition: top 0.2s ease, background-color 0.3s ease, color 0.3s ease;
}

.skip-link:focus {
  top: var(--space-4);
}

header {
  position: sticky;
  top: 0;
  background: var(--surface-translucent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  z-index: 10;
}

nav {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-8);
  max-width: 1200px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  justify-self: start;
  text-decoration: none;
}

.brand-icon {
  display: block;
  border-radius: var(--radius-md);
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-semibold);
  font-size: var(--font-size-md);
  color: var(--text);
}

.accent-text {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
  flex-wrap: wrap;
  justify-self: center;
}

.nav-links a {
  position: relative;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: var(--weight-medium);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--accent);
}

.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--accent);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  justify-self: end;
  width: var(--touch-target);
  height: var(--touch-target);
  flex-shrink: 0;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle:active {
  transform: scale(0.94);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-self: end;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--touch-target);
  height: var(--touch-target);
  flex-shrink: 0;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-burger {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

@media (max-width: 720px) {
  nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    padding: var(--space-4) var(--space-5);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    flex-wrap: nowrap;
    flex-direction: column;
    gap: var(--space-1);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: var(--space-4) var(--space-5);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    display: block;
    padding: var(--space-3) var(--space-2);
    border-radius: var(--radius-sm);
  }

  .nav-links a[aria-current="page"]::after {
    display: none;
  }

  .nav-links a:hover,
  .nav-links a[aria-current="page"] {
    background: var(--accent-soft);
  }
}

main {
  flex: 1 0 auto;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-8);
}

.section-intro {
  color: var(--text-muted);
  margin-top: var(--space-2);
}

/* Buttons */

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-md);
  font-weight: var(--weight-semibold);
  font-size: var(--font-size-md);
  text-decoration: none;
  min-height: var(--touch-target);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  border: 1px solid transparent;
  background: var(--accent-solid);
  color: var(--on-accent);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-primary:active,
.btn-secondary:active {
  transform: translateY(0);
}

/* Footer */

.footer-social {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--footer-text);
  color: var(--footer-text);
  opacity: 0.85;
  transition: opacity 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
}

.footer-social a:hover,
.footer-social a:focus-visible {
  opacity: 1;
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.footer-social svg {
  width: 16px;
  height: 16px;
}

footer {
  text-align: center;
  padding: var(--space-8);
  background: var(--footer-bg);
  color: var(--footer-text);
}

.footer-nav {
  font-size: var(--font-size-base);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-4);
}

.footer-nav a {
  color: inherit;
  text-decoration: none;
  opacity: 0.85;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  opacity: 1;
}

.footer-nav span {
  margin: 0 var(--space-2);
  opacity: 0.5;
}

.footer-links {
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
}

.footer-links a {
  color: inherit;
  text-decoration: underline;
  opacity: 0.8;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  opacity: 1;
}

.footer-links span {
  margin: 0 var(--space-2);
  opacity: 0.5;
}

/* Generic form fields (contact + avis forms) */

form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.field-row .field {
  flex: 1 1 160px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field[hidden] {
  display: none;
}

.field label,
.field-label {
  font-size: var(--font-size-sm);
  font-weight: var(--weight-medium);
  color: var(--text);
}

.field-optional {
  font-weight: var(--weight-normal);
  color: var(--text-muted);
}

input,
textarea,
select {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: var(--font-size-base);
  min-height: var(--touch-target);
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--text-muted);
}

textarea {
  resize: vertical;
}

input:invalid[data-touched="true"],
textarea:invalid[data-touched="true"],
select:invalid[data-touched="true"] {
  border-color: var(--error);
}

.field-error {
  display: none;
  color: var(--error);
  font-size: var(--font-size-sm);
}

.field-error.is-visible,
input:invalid[data-touched="true"] ~ .field-error,
textarea:invalid[data-touched="true"] ~ .field-error,
select:invalid[data-touched="true"] ~ .field-error {
  display: block;
}

button[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  border: none;
  border-radius: var(--radius-md);
  background: var(--accent-solid);
  color: var(--on-accent);
  font-weight: var(--weight-semibold);
  font-size: var(--font-size-base);
  cursor: pointer;
  min-height: var(--touch-target);
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

button[type="submit"]:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-sm);
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}