/* ============================================================
   Démo IA — DA INVprod (noir / blanc / gris, Montserrat, texture)
   ============================================================ */

:root {
  --black: #000;
  --gray-900: #0a0a0a;
  --gray-500: #707070;
  --gray-300: #d9d9d9;
  --white: #fff;
  --border: rgba(255, 255, 255, 0.16);
  --line-soft: rgba(255, 255, 255, 0.32);
  --warn: #e8c37a;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--white);
  font-family: Montserrat, Arial, Helvetica, sans-serif;
  background-color: var(--black);
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.86), rgba(0, 0, 0, 0.9)),
    url("../assets/brand/texture.jpg");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ===== Header ===== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(14px);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 30px; width: auto; }
.brand strong {
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.brand span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.site-header .back {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-500);
  transition: color 180ms ease;
}
.site-header .back:hover { color: var(--white); }

/* ===== Zone centrale ===== */
.shell {
  flex: 1;
  width: min(820px, 100%);
  margin: 0 auto;
  padding: clamp(18px, 4vw, 36px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 0;
}

.intro h1 {
  margin: 0 0 6px;
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.intro p {
  margin: 0;
  color: var(--gray-300);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ===== Avertissement démo ===== */
.disclaimer {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border: 1px solid rgba(232, 195, 122, 0.5);
  background: rgba(232, 195, 122, 0.07);
  color: var(--warn);
  font-size: 0.84rem;
  line-height: 1.5;
}
.disclaimer strong { color: var(--warn); text-transform: uppercase; letter-spacing: 0.08em; }

/* ===== Chat ===== */
.chat {
  flex: 1;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(14px, 3vw, 22px);
  border: 1px solid var(--border);
  background: rgba(5, 5, 5, 0.55);
  overflow-y: auto;
}

.msg { display: flex; flex-direction: column; gap: 4px; max-width: 85%; }
.msg .who {
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-500);
}
.msg .bubble {
  padding: 12px 14px;
  border: 1px solid var(--border);
  line-height: 1.55;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.msg.user { align-self: flex-end; align-items: flex-end; }
.msg.user .bubble { background: var(--white); color: var(--black); border-color: var(--white); }

.msg.ai { align-self: flex-start; }
.msg.ai .bubble { background: rgba(255, 255, 255, 0.04); color: var(--gray-300); }

.msg.error .bubble { border-color: rgba(224, 122, 122, 0.6); color: #e6a3a3; }

.typing .bubble::after {
  content: "…";
  animation: blink 1.2s steps(3, end) infinite;
}
@keyframes blink { 0%, 20% { opacity: 0.2; } 50% { opacity: 1; } 100% { opacity: 0.2; } }

/* ===== Saisie ===== */
.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}
.composer textarea {
  width: 100%;
  min-height: 52px;
  max-height: 160px;
  resize: vertical;
  padding: 14px;
  color: var(--white);
  background: #050505;
  border: 1px solid var(--border);
  font: inherit;
  line-height: 1.5;
  outline: none;
}
.composer textarea:focus { border-color: var(--line-soft); }

.btn {
  height: 52px;
  padding: 0 22px;
  border: 1px solid var(--white);
  background: var(--white);
  color: var(--black);
  font: inherit;
  font-weight: 900;
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}
.btn:hover { background: var(--gray-300); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.foot-note {
  margin: 0;
  color: var(--gray-500);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

/* ===== Pied ===== */
.site-footer {
  padding: 18px clamp(16px, 4vw, 40px);
  border-top: 1px solid var(--border);
  color: var(--gray-500);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

@media (max-width: 520px) {
  .composer { grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .msg { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}