/* ====== Variables (palette) ====== */
:root{
  --green-900:#004d00;   /* vert foncé - base */
  --green-700:#1b5e20;   /* hover/actif */
  --green-400:#4caf50;   /* accents doux */
  --mint-100:#e8f5e9;    /* fond léger */
  --gray-900:#1a1a1a;
  --gray-700:#444;
  --gray-400:#8a8a8a;
  --gray-200:#e6e6e6;
  --white:#fff;
  --radius:10px;
  --shadow:0 2px 8px rgba(0,0,0,.06);
}

/* ====== Reset simple ====== */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
img{max-width:100%;height:auto;display:block}

/* ====== Layout ====== */
body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color:var(--gray-900);
  background:var(--mint-100);
  line-height:1.5;
}
.container{max-width:1040px;margin:24px auto;padding:0 16px}

/* ====== Header / Nav ====== */
.header{
  background:var(--white);
  border-bottom:1px solid var(--gray-200);
  box-shadow:var(--shadow);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:10px 16px;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-title{font-weight:700;color:var(--green-900)}
.nav{display:flex;gap:12px}
.nav a{
  text-decoration:none;color:var(--gray-700);padding:8px 10px;border-radius:8px
}
.nav a:hover{background:var(--gray-200);color:var(--green-900)}

/* Stack nav on small screens */
@media (max-width:640px){
  .header-inner{flex-direction:column;align-items:flex-start}
  .nav{width:100%;flex-wrap:wrap}
}

/* ====== Typography ====== */
h1,h2,h3{margin:0 0 8px 0}
p{margin:0 0 12px 0}

/* ====== Cards ====== */
.card{
  background:var(--white);border:1px solid var(--gray-200);
  border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);
}

/* ====== Buttons ====== */
.btn{
  display:inline-block;border:1px solid transparent;border-radius:10px;
  padding:10px 16px;font-weight:600;text-decoration:none;cursor:pointer;
  transition:transform .02s ease, background .15s ease, color .15s ease, border-color .15s ease;
}
.btn:active{transform:scale(.98)}
.btn:focus-visible{outline:3px solid rgba(0,77,0,.3);outline-offset:2px}

/* Solid */
.btn-primary{
  background:var(--green-900);color:var(--white);
}
.btn-primary:hover{background:var(--green-700)}
/* Outline */
.btn-outline{
  background:transparent;color:var(--green-900);border-color:var(--green-900)
}
.btn-outline:hover{background:rgba(0,77,0,.06)}

/* Subtle */
.btn-subtle{
  background:var(--white);color:var(--gray-900);border-color:var(--gray-200)
}
.btn-subtle:hover{border-color:var(--green-400);color:var(--green-900)}

/* Full width on small screens */
@media (max-width:480px){
  .btn{width:100%;text-align:center}
}

/* ====== Forms ====== */
form{display:grid;gap:12px}
.input, select, textarea{
  width:100%;padding:10px 12px;border:1px solid var(--gray-200);
  border-radius:10px;background:var(--white);color:var(--gray-900)
}
.input:focus, select:focus, textarea:focus{
  border-color:var(--green-400);outline:3px solid rgba(76,175,80,.25)
}
label{font-size:14px;color:var(--gray-700)}

/* ====== Table ====== */
.table{width:100%;border-collapse:collapse;border-radius:10px;overflow:hidden}
.table th,.table td{padding:10px;border-bottom:1px solid var(--gray-200);text-align:left}
.table th{background:#f7faf8;color:var(--gray-700)}

/* ====== Utilities ====== */
.center{display:flex;align-items:center;justify-content:center}
.mt-16{margin-top:16px}.mt-24{margin-top:24px}
.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}

/* ====== Optional dark-mode ====== */
@media (prefers-color-scheme: dark){
  :root{
    --mint-100:#0f1a12; --gray-200:#2a2a2a; --gray-400:#9aa3a3;
    --gray-700:#cbd5d5; --gray-900:#e6f0ee; --white:#101514;
    --shadow:0 2px 10px rgba(0,0,0,.35);
  }
  body{background:var(--white)}
  .header{background:#121a14;border-bottom-color:#1d2a20}
  .nav a:hover{background:#1d2a20}
  .card{background:#121a14;border-color:#1d2a20}
  .btn-outline{border-color:var(--green-400);color:var(--green-400)}
  .btn-outline:hover{background:rgba(76,175,80,.1)}
}