/* =========================================================================
   Simulateur de négociation BTS NDRC — feuille de style
   Design system maison, sans framework externe.
   ========================================================================= */

:root {
    color-scheme: light;

    --color-bg: #f4f5f7;
    --color-surface: #ffffff;
    --color-surface-muted: #f9fafb;
    --color-border: #e2e5ea;
    --color-text: #1c2129;
    --color-text-muted: #5b6472;
    --color-primary: #2451c4;
    --color-primary-dark: #17348c;
    --color-primary-soft: #e7edfc;
    --color-success: #1c8a5a;
    --color-success-soft: #e4f6ee;
    --color-danger: #c23b3b;
    --color-danger-soft: #fbe9e9;
    --color-warning: #b8790f;
    --color-warning-soft: #fdf1de;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-card: 0 1px 2px rgba(20, 24, 32, 0.04), 0 8px 24px rgba(20, 24, 32, 0.06);

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.5;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 650; }
h1 { font-size: 1.7rem; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 1em; }

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 20px 64px;
}

/* ---------- Navigation ---------------------------------------------------- */

.topbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 14px 20px;
    margin-bottom: 28px;
}

.topbar__inner {
    max-width: 1080px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--color-text);
}

.brand__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 700;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 0.92rem;
}

.nav-links form { margin: 0; }

.nav-user {
    color: var(--color-text-muted);
    font-size: 0.88rem;
}

/* ---------- Cards & layout -------------------------------------------------- */

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    padding: 24px;
    margin-bottom: 20px;
}

.card--muted {
    background: var(--color-surface-muted);
    box-shadow: none;
}

.grid {
    display: grid;
    gap: 18px;
}

.grid--scenarios {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.page-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.page-header p { margin: 0; color: var(--color-text-muted); }

/* ---------- Badges & pills --------------------------------------------------- */

.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.76rem;
    font-weight: 650;
    letter-spacing: .01em;
}

.badge--facile { background: var(--color-success-soft); color: var(--color-success); }
.badge--moyen { background: var(--color-warning-soft); color: var(--color-warning); }
.badge--difficile { background: var(--color-danger-soft); color: var(--color-danger); }

.badge--status-en_cours { background: var(--color-primary-soft); color: var(--color-primary-dark); }
.badge--status-conclue { background: var(--color-success-soft); color: var(--color-success); }
.badge--status-echouee { background: var(--color-danger-soft); color: var(--color-danger); }
.badge--status-abandon_temps { background: var(--color-warning-soft); color: var(--color-warning); }
.badge--status-abandonnee { background: #eee; color: #666; }

/* ---------- Buttons ----------------------------------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .12s ease, transform .05s ease;
}

.btn:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn--secondary {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}
.btn--secondary:hover { background: var(--color-surface-muted); }

.btn--danger { background: var(--color-danger); }
.btn--danger:hover { background: #9c2e2e; }

.btn--block { width: 100%; }
.btn--sm { padding: 6px 12px; font-size: 0.82rem; }

/* ---------- Forms --------------------------------------------------------------- */

form .form-row { margin-bottom: 16px; }

label { display: block; font-size: 0.86rem; font-weight: 600; margin-bottom: 6px; color: var(--color-text); }

input[type="text"], input[type="email"], input[type="password"], textarea, select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.94rem;
    background: #fff;
    color: var(--color-text);
}

textarea { resize: vertical; min-height: 72px; }

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.form-help { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 4px; }
.form-error { font-size: 0.8rem; color: var(--color-danger); margin-top: 4px; }

/* ---------- Flash messages -------------------------------------------------------- */

.flash {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 0.9rem;
}
.flash--success { background: var(--color-success-soft); color: var(--color-success); }
.flash--error { background: var(--color-danger-soft); color: var(--color-danger); }

/* ---------- Gauges (scores) ------------------------------------------------------- */

.gauges {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.gauge__label {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.gauge__track {
    height: 9px;
    border-radius: 999px;
    background: var(--color-border);
    overflow: hidden;
}

.gauge__fill {
    height: 100%;
    border-radius: 999px;
    background: var(--color-primary);
    transition: width .25s ease;
}

.gauge__fill--trust { background: #2451c4; }
.gauge__fill--margin { background: #1c8a5a; }
.gauge__fill--danger { background: var(--color-danger); }
.gauge__fill--warning { background: var(--color-warning); }

/* ---------- Chat transcript -------------------------------------------------------- */

.chat {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 22px;
}

.bubble {
    max-width: 78%;
    padding: 12px 15px;
    border-radius: var(--radius-md);
    font-size: 0.93rem;
    line-height: 1.45;
}

.bubble--client {
    align-self: flex-start;
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-top-left-radius: 4px;
}

.bubble--student {
    align-self: flex-end;
    background: var(--color-primary);
    color: #fff;
    border-top-right-radius: 4px;
}

.bubble__meta {
    display: block;
    font-size: 0.72rem;
    opacity: .75;
    margin-bottom: 4px;
}

.turn-feedback {
    align-self: flex-end;
    max-width: 78%;
    font-size: 0.78rem;
    color: var(--color-text-muted);
    padding: 2px 4px 0;
}

/* ---------- Tables ------------------------------------------------------------------ */

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--color-border); }
th { color: var(--color-text-muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: .03em; }
tr:last-child td { border-bottom: none; }
.table-wrap { overflow-x: auto; }

/* ---------- Utility -------------------------------------------------------------------- */

.muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.stack { display: flex; flex-direction: column; gap: 6px; }
.row { display: flex; align-items: center; gap: 10px; }
.row--between { justify-content: space-between; }
.mt-0 { margin-top: 0; }
.empty-state { padding: 40px 20px; text-align: center; color: var(--color-text-muted); }

.score-hero {
    display: flex;
    align-items: center;
    gap: 22px;
    padding: 22px 0;
}

.score-hero__number {
    font-size: 3rem;
    font-weight: 750;
    color: var(--color-primary);
    line-height: 1;
}

@media (prefers-color-scheme: dark) {
    /* Le poste de travail visé (Apache2/LXD interne) est en usage clair par défaut ;
       le thème sombre n'est pas prioritaire pour la v1 mais les couleurs restent lisibles. */
}