/*-----------------------------------------------------------------------------
 * Project : Athena SimLab
 * File    : frontend/css/app-shell.css
 * Stylesheet : app shell
 * Author  : Johann Sievering
 * AI Support : Claude AI
 * Date    : 2026-06-11 (start of the project)
 * Rev     : 2026-07-03 Full code review: bug fixes, hardening, cartridge headers (Claude AI)
 * Version : 0.9.0
 *-----------------------------------------------------------------------------
 * Fixed header, bottom tab bar, content shell and their responsive rules.
 *---------------------------------------------------------------------------*/

/* =====================================================================
 * app-shell.css — sticky header + footer + scrollable content area.
 *
 * Required after variables.css. Adapted from ISAI's app-shell with our
 * brand palette and our 5-section footer (Home / Scan / Assemble /
 * Analyse / About).
 *
 *   ┌─────────────────────────────────────┐ ← .app-header (fixed top)
 *   │  AI4Good · Atelier      FR EN DE IT │
 *   ├─────────────────────────────────────┤
 *   │                                     │
 *   │           .app-content              │ ← scrollable
 *   │                                     │
 *   ├─────────────────────────────────────┤
 *   │ 🏠   📷   🧩   ✨   ℹ️             │ ← .app-footer (fixed bottom)
 *   └─────────────────────────────────────┘
 * ===================================================================== */

/* ── Body reset ─────────────────────────────────────────────────────── */
body.app {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    color: var(--text);
    background: var(--bg);
    line-height: var(--line-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;

    opacity: 0;                           /* FOUC prevention until JS init */
}
body.app.ready {
    opacity: 1;
    transition: opacity 0.15s ease-in;
}

/* ── Header ────────────────────────────────────────────────────────── */
.app-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    z-index: var(--z-header);

    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-md);

    background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue) 100%);
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.app-header__brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: #fff;
    white-space: nowrap;
    user-select: none;
    -webkit-user-select: none;
    transition: opacity var(--transition-fast);
}
.app-header__brand:hover { opacity: 0.85; }

.app-header__brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}
.app-header__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    letter-spacing: 0.03em;
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}
.app-header__subtitle {
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255,255,255,0.8);
}

/* ── Right side of the header: user badge + language pills ───────── */
.app-header__right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 0;               /* lets the badge's name ellipsize */
    position: relative;         /* anchors the badge's dropdown menu */
}

/* Dropdown under the badge: "my space" + sign out. */
.app-header__menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 13rem;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
    padding: 6px;
    z-index: 50;
    display: flex;
    flex-direction: column;
}
.app-header__menu-item {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 10px 12px;
    border: none;
    border-radius: 8px;
    background: none;
    color: #1a1a1a;
    font: inherit;
    font-weight: 600;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
}
.app-header__menu-item:hover { background: #eef3f8; }

/* Signed-in user badge (hidden for visitors; filled by AppHeader.js). */
.app-header__user {
    border: none;
    font: inherit;
    cursor: pointer;
}
.app-header__user {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    min-width: 0;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(4px);
    color: #fff;
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}
.app-header__user:hover { background: rgba(255,255,255,0.28); }
.app-header__user-name {
    max-width: 9rem;
    overflow: hidden;
    text-overflow: ellipsis;
}
/* Small phones: the name would crowd the pills — keep just the icon. */
@media (max-width: 480px) {
    .app-header__user-name { display: none; }
}

/* ── Language pills (inside the header) ──────────────────────────── */
.app-header__langs {
    display: flex;
    gap: 2px;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-pill);
    padding: 2px;
    backdrop-filter: blur(4px);
}

.lang-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 5px 10px;
    min-width: 36px;
    min-height: 36px;
    border: none;
    border-radius: var(--radius-pill);
    background: transparent;
    color: rgba(255,255,255,0.75);
    font: inherit;
    font-size: var(--font-size-xs);
    font-weight: 600;
    cursor: pointer;
    line-height: 1;
    transition: background var(--transition-fast), color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}
.lang-pill:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}
.lang-pill--active,
.lang-pill--active:hover {
    background: rgba(255,255,255,0.92);
    color: var(--blue-900);
}

/* ── Content area ─────────────────────────────────────────────────── */
.app-content {
    min-height: 100vh;
    max-width: 760px;
    margin: 0 auto;
    box-sizing: border-box;
    padding-top:    calc(var(--header-height) + var(--space-md));
    padding-bottom: calc(var(--footer-height) + env(safe-area-inset-bottom, 0px) + var(--space-md));
    padding-left:   var(--space-md);
    padding-right:  var(--space-md);
}

/* ── Footer navigation ────────────────────────────────────────────── */
.app-footer {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    height: calc(var(--footer-height) + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    z-index: var(--z-footer);

    display: flex;
    align-items: center;
    justify-content: space-around;

    background: var(--bg-card);
    box-shadow: 0 -1px 4px rgba(0,0,0,0.08);
}

.app-footer__item {
    flex: 1;
    height: 100%;
    padding: var(--space-xs) 0;
    box-sizing: border-box;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;

    text-decoration: none;
    color: var(--text-light);
    font-size: var(--font-size-xs);
    font-weight: 500;
    transition: color var(--transition-fast);

    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    cursor: pointer;
}
.app-footer__item:hover { color: var(--primary); }

.app-footer__icon {
    font-size: 1.35rem;
    line-height: 1;
}
.app-footer__label {
    font-size: 0.7rem;
    line-height: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 80px;
    text-align: center;
}

.app-footer__item--active {
    color: var(--primary);
    font-weight: 700;
}
.app-footer__item--active .app-footer__icon { transform: scale(1.1); }

/* Section-specific active colors (one accent per tab).
   data-section values are set by AppFooter.js — keep both in sync. */
.app-footer__item--active[data-section="accueil"] { color: var(--section-accueil); }
.app-footer__item--active[data-section="compose"] { color: var(--section-compose); }
.app-footer__item--active[data-section="create"]  { color: var(--section-create);  }
.app-footer__item--active[data-section="learn"]   { color: var(--section-learn);   }
.app-footer__item--active[data-section="corpus"]  { color: var(--section-corpus);  }
.app-footer__item--active[data-section="contact"] { color: var(--section-contact); }
.app-footer__item--active[data-section="more"]    { color: var(--section-more);    }

/* ── Desktop-only shell elements (header nav, © page footer) ──────────
   Built by AppFooter on EVERY page that mounts the shell — participant
   AND admin. Hidden by default; the desktop block below reveals and
   styles them behind the ≥1200px + mouse gate (phones and tablets never
   match it — the mobile interfaces stay untouched). */
.app-header__nav { display: none; }
.app-pagefoot    { display: none; }

@media (min-width: 1200px) and (hover: hover) and (pointer: fine) {

    /* The bottom tab bar gives way to the header navigation. */
    .app-footer { display: none; }

    .app-header__nav {
        display: flex;
        align-items: center;
        gap: 4px;
        margin: 0 var(--space-lg);
        flex: 1;
        min-width: 0;
    }
    .app-header__nav-item {
        padding: 8px 14px;
        border-radius: var(--radius-pill);
        color: rgba(255, 255, 255, 0.82);
        text-decoration: none;
        font-size: var(--font-size-sm);
        font-weight: 600;
        white-space: nowrap;
        cursor: pointer;
        transition: background var(--transition-fast), color var(--transition-fast);
    }
    .app-header__nav-item:hover {
        background: rgba(255, 255, 255, 0.14);
        color: #fff;
    }
    .app-header__nav-item--active,
    .app-header__nav-item--active:hover {
        background: rgba(255, 255, 255, 0.22);
        color: #fff;
        font-weight: 700;
    }

    /* The "⋮" menu: compact anchored dropdown (Matériel AV pattern). */
    .app-header__nav-more { position: relative; display: inline-flex; }
    .app-header__nav-ellipsis {
        border: 0;
        background: transparent;
        font: inherit;
        font-size: 1.15rem;
        font-weight: 700;
        line-height: 1;
        padding: 8px 12px;
    }
    .app-header__more {
        display: none;
        position: absolute;
        top: calc(100% + 10px);
        left: 0;
        min-width: 15rem;
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
        padding: 6px;
        z-index: 60;
    }
    .app-header__more.open { display: block; }
    .app-header__more-item {
        display: block;
        padding: 10px 14px;
        border-radius: var(--radius-sm);
        color: var(--text);
        text-decoration: none;
        font-size: var(--font-size-sm);
        font-weight: 600;
        white-space: nowrap;
    }
    .app-header__more-item:hover { background: var(--gray-50); color: var(--blue-900); }

    /* Slim © page footer — a FIXED full-width bar, always visible, one
       step darker than the canvas (hex fallback where color-mix is
       missing):  © 2026 Swiss Informatics Society · Athena SimLab vX ·
       Vie privée */
    .app-pagefoot {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: var(--z-footer);
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        align-items: baseline;
        gap: 4px 10px;
        padding: 12px var(--space-lg);
        font-size: var(--font-size-xs);
        color: var(--text-light);
        border-top: 1px solid var(--border);
        background: #E8E5DB;
        background: color-mix(in srgb, var(--gray-50) 70%, var(--gray-border) 30%);
        box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.06);
    }
    .app-pagefoot__dot { user-select: none; }
    .app-pagefoot__link {
        color: var(--text-light);
        font-weight: 600;
        text-decoration: none;
        transition: color var(--transition-fast);
    }
    .app-pagefoot__link:hover { color: var(--blue-900); text-decoration: underline; }
    .app-pagefoot__app { color: var(--text); font-weight: 700; }
    .app-pagefoot__app:hover { color: var(--blue-900); }
}

/* ── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 599px) {
    .app-header        { padding: 0 var(--space-sm); }
    .app-header__title { font-size: 1rem; }
    .app-content       { padding-left: var(--space-sm); padding-right: var(--space-sm); }
    .app-footer__icon  { font-size: 1.15rem; }
    .app-footer__label { font-size: 0.6rem; max-width: 56px; }
}

@media (min-width: 1024px) {
    .app-header        { padding: 0 var(--space-xl); }
    .app-header__title { font-size: var(--font-size-xl); }
    .app-header__subtitle { font-size: 0.7rem; }
    .app-content       { padding-left: var(--space-xl); padding-right: var(--space-xl); }
    .app-footer__icon  { font-size: 1.5rem; }
}