/* ==========================
   RESET & GLOBALS
   ========================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html, body {
  height: 100%;
  font-family: 'Montserrat', sans-serif;
  background-color: #151934;
  color: #ffffff;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Variables palette sombre */
:root {
  --bg: #151934;
  --surface: #1b1f3b;
  --text: #ffffff;
  --muted: #aaaaff;
  --primary: #00d4ff;
  --primary-600: #0077ff;
  --accent: #9b59b6;
  --card: #1f223e;
  --border: rgba(255,255,255,0.1);
  --shadow: 0 6px 20px rgba(0,0,0,0.6);
  --radius: 12px;
  --max-width: 1200px;
  --container-padding: 1rem;
  --font-sans: 'Montserrat', sans-serif;
}

/* Conteneur centré */
.container{
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* Typographie */
h1,h2,h3{ margin:0 0 .6rem 0; line-height:1.15; }
h1{ font-size: clamp(1.6rem, 2.4vw, 2.4rem); font-weight:800; color:var(--text);}
h2{ font-size: 1.4rem; font-weight:700; color:var(--text);}
h3{ font-size: 1.05rem; font-weight:600; color:var(--text);}
p{ margin:0 0 1rem 0; color:var(--muted);}
a{ color:inherit; text-decoration:none;}
a:hover{ text-decoration:underline;}

/* ==========================
   HEADER
   ========================== */
header.main-header {
    background-color: var(--surface);
    color: var(--text);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.main-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}
.main-header .logo a {
    font-size: 1.8rem;
    font-weight: 800;
    text-decoration: none;
    background: linear-gradient(90deg, #00d4ff, #0077ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.nav-center {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex: 1;
}
.nav-center a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
}
.nav-center a:hover { color: var(--primary);}
.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.language-select {
    background: transparent;
    color: var(--text);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    font-weight: 500;
    appearance: none;
}
.nav-right .btn {
    padding: 0.5rem 1rem;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    min-width: 100px;
    text-align: center;
}
.login-btn, .signup-btn {
    background: linear-gradient(90deg, #00d4ff, #0077ff);
    color: white;
    border: none;
}
.logout-btn { background-color: #c0392b; color:white; border:none; }
.login-btn:hover, .signup-btn:hover, .logout-btn:hover { opacity:0.9; }

/* Responsive Header */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    .nav-center { margin: 1rem 0; flex-direction: column; gap:.5rem;}
    .nav-right { flex-direction: column; width:100%;}
    .nav-right .btn { width:100%; }
    .language-select { width:100%; }
}

/* ==========================
   BUTTONS
   ========================== */
.btn{
  display:inline-block;
  text-decoration:none;
  font-weight:600;
  border-radius:8px;
  padding: .6rem 1rem;
  border: 1px solid transparent;
  cursor:pointer;
  transition: all .15s ease;
  font-size: .95rem;
  line-height:1;
  background:transparent;
  color:var(--text);
}
.btn:focus{ outline:3px solid rgba(0,212,255,0.25); outline-offset:3px; }
.btn-primary{ background: var(--primary); color:#fff; }
.btn-secondary{ background:transparent; border:1px solid var(--border); color:var(--text); }
.btn-outline{ background:transparent; border:1px solid var(--primary); color: var(--primary); }
.btn:active{ transform: translateY(0); }

/* ==========================
   HERO
   ========================== */
.hero{
  padding: 3.25rem 0;
  background: linear-gradient(180deg, rgba(0,212,255,0.03), transparent 60%);
}
.hero-content{
  display:flex;
  align-items:center;
  gap: 2rem;
  justify-content: space-between;
  flex-wrap:wrap;
}
.hero-text{ flex:1 1 420px; min-width:260px; }
.hero-subtitle{ font-size:1rem; color:var(--muted); margin-bottom:1rem; }
.hero-cta{ display:flex; gap:.75rem; flex-wrap:wrap; margin-top:1rem; }
.hero-image{ flex: 0 0 420px; display:flex; align-items:center; justify-content:center; }
.hero-image img{ max-width:100%; height:auto; border-radius: 12px; box-shadow: var(--shadow); border:1px solid var(--border); }

/* ==========================
   FEATURES
   ========================== */
.features{ padding:2.25rem 0; }
.features-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:1rem; margin-top:1rem; }
.feature-card{
  background:var(--card);
  border-radius: var(--radius);
  padding:1rem;
  border:1px solid var(--border);
  box-shadow: 0 4px 14px rgba(0,0,0,0.3);
  text-align:left;
}
.feature-icon{ width:52px; height:52px; display:flex; align-items:center; justify-content:center; margin-bottom:.6rem;}
.feature-icon img{ max-width:100%; height:auto; display:block; }

/* ==========================
   HOW IT WORKS
   ========================== */
.how-it-works{ padding:2.25rem 0; background:var(--surface); border-top:1px solid rgba(255,255,255,0.1);}
.steps-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:1rem; margin-top:1rem;}
.step{ background:transparent; padding:1rem; border-radius:10px; border:1px dashed rgba(255,255,255,0.1); min-height:140px;}
.step-number{ width:36px; height:36px; border-radius:50%; background:var(--primary); color:#fff; display:inline-flex; align-items:center; justify-content:center; font-weight:700; margin-bottom:.6rem; }

/* ==========================
   USE CASES
   ========================== */
.use-cases{ padding:2.25rem 0; }
.use-cases-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:1rem; margin-top:1rem; }
.use-case-card{ background:var(--card); border-radius: var(--radius); overflow: hidden; border:1px solid var(--border); display:flex; flex-direction:column; box-shadow: var(--shadow);}
.use-case-card img{ width:100%; height:160px; object-fit:cover; display:block; }
.use-case-card h3{ padding:.75rem 1rem 0 1rem; }
.use-case-card p{ padding:.5rem 1rem 1rem 1rem; color:var(--muted); }

/* ==========================
   PRICING
   ========================== */
.pricing{ padding:2.5rem 0; background: linear-gradient(180deg, transparent, rgba(0,212,255,0.02)); }
.pricing-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:1rem; margin-top:1rem; align-items:stretch;}
.pricing-card{ background:var(--card); border-radius:14px; padding:1.25rem; border:1px solid var(--border); display:flex; flex-direction:column; justify-content:space-between; box-shadow: var(--shadow);}
.pricing-card.featured{ transform: translateY(-8px); border: 1px solid var(--primary);}
.pricing-header{ display:flex; align-items:center; justify-content:space-between; gap:.5rem; margin-bottom:.75rem;}
.price{ text-align:right;}
.price .amount{ font-size:1.5rem; font-weight:800; color:var(--text);}
.price .period{ display:block; font-size:.85rem; color:var(--muted);}
.features-list{ list-style:none; padding:0; margin: .5rem 0 1rem 0; color:var(--muted);}
.features-list li{ padding: .35rem 0; border-bottom: 1px dashed rgba(255,255,255,0.1); font-size:.95rem;}
.pricing-card .btn{ width:100%; padding:.7rem; border-radius:10px; }

/* ==========================
   TESTIMONIALS
   ========================== */
.testimonials{ padding:2rem 0; }
.testimonials-grid{ display:grid; grid-template-columns: repeat(2, 1fr); gap:1rem; margin-top:1rem;}
.testimonial{ background:var(--card); border-radius:12px; padding:1rem; border:1px solid var(--border); box-shadow: var(--shadow);}
.testimonial blockquote{ margin:0 0 .75rem 0; color:var(--muted); font-style:italic;}
.testimonial-author strong{ display:block;}
.testimonial-author span{ color:var(--muted); font-size:.9rem;}

/* ==========================
   FOOTER
   ========================== */
#footer{
  padding: 2rem 0;
  background:var(--surface);
  border-top:1px solid rgba(255,255,255,0.1);
  margin-top:2rem;
}
.footer-container {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: space-between;
    padding-left: 20px;   /* espace à gauche */
    padding-right: 20px;  /* espace à droite */
}

.footer-links, .social-icons, .footer-legal{ min-width:200px;}
.footer-links a, .footer-legal a{ display:block; color:var(--muted); margin: .35rem 0; font-size:.95rem;}
.social-icons a{ display:inline-block; margin-right: .5rem; font-size:1.05rem; color:var(--muted);}
.footer-left{ margin-top:1rem; color:var(--muted); font-size:.95rem; text-align:center;}

/* ==========================
   RESPONSIVE
   ========================== */
@media (max-width: 980px){
  .features-grid, .steps-grid, .use-cases-grid, .pricing-grid{ grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid{ grid-template-columns: 1fr; }
  .hero-image{ flex-basis: 320px; }
}
@media (max-width: 720px){
  .hero-content{ flex-direction:column-reverse; align-items:flex-start; gap:1rem; }
  .features-grid, .steps-grid, .use-cases-grid, .pricing-grid{ grid-template-columns: 1fr; }
  .hero{ padding: 2rem 0; }
  .container{ padding-left: .75rem; padding-right: .75rem; }
  .use-case-card img{ height:140px; }
}

/* Utilities */
.text-center{ text-align:center; }
.muted{ color:var(--muted); }
.kicker{ text-transform:uppercase; font-weight:700; font-size:.8rem; color:var(--primary); letter-spacing:.06em; }
img{ max-width:100%; display:block; }
[role="img"]{ display:block; }