/**
 * Panel Zath — fondations (variables, layout, header, flash).
 */

:root {
    --bg-deep: #070a0f;
    --bg: #0c1018;
    --surface: #121826;
    --surface-elevated: #181f2e;
    --border: rgba(120, 144, 182, 0.18);
    --border-strong: rgba(120, 144, 182, 0.35);
    --text: #eef2f8;
    --muted: #8b97ad;
    --accent: #5eb0ff;
    --accent-dim: rgba(94, 176, 255, 0.14);
    --accent-glow: rgba(94, 176, 255, 0.35);
    --danger: #ff6b7a;
    --danger-dim: rgba(255, 107, 122, 0.14);
    --ok: #4ade80;
    --ok-dim: rgba(74, 222, 128, 0.14);
    --radius: 14px;
    --radius-sm: 10px;
    --font: "DM Sans", system-ui, "Segoe UI", Roboto, sans-serif;
    --shadow-header: 0 4px 24px rgba(0, 0, 0, 0.35);
    --transition: 0.18s ease;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-font-smoothing: antialiased;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font);
    font-size: 0.95rem;
    line-height: 1.55;
    color: var(--text);
    background: var(--bg-deep);
    background-image:
        radial-gradient(ellipse 120% 80% at 50% -30%, rgba(94, 176, 255, 0.16), transparent 55%),
        radial-gradient(ellipse 90% 60% at 100% 50%, rgba(139, 92, 246, 0.07), transparent 50%),
        radial-gradient(ellipse 70% 50% at 0% 80%, rgba(74, 222, 128, 0.05), transparent 45%);
}

header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(18, 24, 38, 0.78);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 0.85rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    box-shadow: var(--shadow-header);
}

.header-brand strong {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(120deg, var(--text) 0%, var(--accent) 160%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.header-brand .logo-mark {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
    margin-right: 0.5rem;
    vertical-align: middle;
}

.header-brand {
    flex: 0 0 auto;
}

.nav-tabs {
    display: flex;
    gap: 0.35rem;
    flex: 1 1 auto;
    justify-content: center;
    flex-wrap: wrap;
    padding: 0.2rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 999px;
    border: 1px solid var(--border);
}

.nav-tabs a {
    color: var(--muted);
    text-decoration: none;
    padding: 0.45rem 1.15rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.88rem;
    transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.nav-tabs a:hover {
    color: var(--text);
    background: var(--accent-dim);
}

.nav-tabs a.is-active {
    color: var(--text);
    background: linear-gradient(145deg, var(--surface-elevated), var(--surface));
    border: 1px solid var(--border-strong);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

.header-user {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-left: auto;
    flex-wrap: wrap;
}

.header-user .muted {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.header-user a[href] {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.88rem;
}

.header-user a[href]:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

main {
    max-width: 1080px;
    margin: 0 auto;
    padding: 1.75rem 1.5rem 3rem;
}

.flash {
    padding: 0.85rem 1.1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    font-size: 0.9rem;
}

.flash-success {
    background: var(--ok-dim);
    border-color: rgba(74, 222, 128, 0.35);
    color: #86efac;
}

.flash-danger {
    background: var(--danger-dim);
    border-color: rgba(255, 107, 122, 0.35);
    color: #fca5a5;
}

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

code {
    font-family: ui-monospace, "Cascadia Code", monospace;
    font-size: 0.82rem;
    color: var(--accent);
    background: rgba(94, 176, 255, 0.08);
    padding: 0.15rem 0.45rem;
    border-radius: 6px;
}

/* -------------------------------------------------------------------------
   Responsive — mobile & tablettes
   ------------------------------------------------------------------------- */

@media (max-width: 768px) {
    header {
        padding: 0.65rem 1rem;
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
        padding-top: max(0.65rem, env(safe-area-inset-top));
    }

    .header-brand strong {
        font-size: 0.98rem;
    }

    main {
        padding: 1.25rem 1rem 2.5rem;
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
        padding-bottom: max(2.5rem, env(safe-area-inset-bottom));
    }

    .page-title {
        font-size: 1.35rem;
    }

    .page-lead {
        font-size: 0.88rem;
    }
}

@media (max-width: 640px) {
    .nav-tabs {
        order: 3;
        width: 100%;
        justify-content: stretch;
        border-radius: var(--radius-sm);
    }

    .nav-tabs a {
        flex: 1;
        text-align: center;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }

    .header-user {
        width: 100%;
        margin-left: 0;
        justify-content: space-between;
        padding-top: 0.25rem;
        border-top: 1px solid var(--border);
    }

    .header-user .muted {
        max-width: min(60vw, 220px);
    }

    .flash {
        font-size: 0.85rem;
        padding: 0.75rem 0.9rem;
    }
}

@media (max-width: 380px) {
    .header-brand .logo-mark {
        display: none;
    }

    .header-brand strong {
        font-size: 0.92rem;
    }
}