/* ============================================================
   layout.css – App shell, grid, utilities
   ============================================================ */

/* Reset & base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }
html,
body {
    overscroll-behavior-y: contain;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--text-primary);
    background: var(--bg-body);
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

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

img, svg { display: block; max-width: 100%; }

/* ── App Shell ─────────────────────────────────────────────── */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

/* ── Header ────────────────────────────────────────────────── */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
}

.app-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}
.app-logo:hover { text-decoration: none; }
.app-logo-icon { font-size: 1.5rem; }

.header-actions { display: flex; align-items: center; gap: var(--space-2); }

/* ── Bottom nav (mobile) ───────────────────────────────────── */
.bottom-nav {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 90;
    min-height: var(--bottom-nav-height);
    padding-bottom: max(env(safe-area-inset-bottom), 0px);
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: stretch;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.bottom-nav-item {
    flex: 1 0 4.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--font-size-xs);
    transition: color var(--transition);
    padding: var(--space-1) 0;
}
.bottom-nav-item:hover { color: var(--color-primary); text-decoration: none; }
.bottom-nav-item.active { color: var(--color-primary); }
.bottom-nav-item .nav-icon { font-size: 1.375rem; line-height: 1; }

/* ── Sidebar (desktop) ─────────────────────────────────────── */
.sidebar {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 80;
}

.sidebar-inner { padding: var(--space-4) var(--space-2); display: flex; flex-direction: column; gap: var(--space-1); }

.sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
}
.sidebar-item:hover { background: var(--bg-surface-hover); color: var(--text-primary); text-decoration: none; }
.sidebar-item.active { background: var(--color-primary-light); color: var(--color-primary); }
.sidebar-item .nav-icon { font-size: 1.25rem; flex-shrink: 0; }

/* ── Main content ──────────────────────────────────────────── */
.main-content {
    flex: 1;
    padding: var(--space-4) var(--space-4) calc(var(--bottom-nav-height) + var(--space-4) + max(env(safe-area-inset-bottom), 0px));
}

/* ── Container ─────────────────────────────────────────────── */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
}

/* ── Grid system ───────────────────────────────────────────── */
.grid { display: grid; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: repeat(2, 1fr); }
.gap-1  { gap: var(--space-1); }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }

/* ── Module grid ───────────────────────────────────────────── */
.module-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

/* ── Stats grid ────────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    gap: var(--space-4);
}

/* ── Auth wrapper ──────────────────────────────────────────── */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: var(--bg-body);
}
.auth-card { width: 100%; max-width: 24rem; }
.auth-card--wide { max-width: 36rem; }
.auth-logo { text-align: center; margin-bottom: var(--space-6); }
.auth-logo-icon { font-size: 3rem; display: block; margin-bottom: var(--space-2); }
.auth-title { font-size: var(--font-size-2xl); font-weight: 700; margin-bottom: var(--space-1); }
.auth-subtitle { color: var(--text-muted); }
.auth-switch { text-align: center; margin-top: var(--space-4); font-size: var(--font-size-sm); color: var(--text-muted); }

/* ── Page header ───────────────────────────────────────────── */
.page-header { margin-bottom: var(--space-6); display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: var(--space-2); }
.page-title { font-size: var(--font-size-2xl); font-weight: 700; color: var(--text-primary); }
.page-subtitle { color: var(--text-muted); margin-top: var(--space-1); }

/* ── Utilities ─────────────────────────────────────────────── */
.flex         { display: flex; }
.flex-center  { align-items: center; }
.flex-between { justify-content: space-between; }
.flex-wrap    { flex-wrap: wrap; }
.inline       { display: inline; }

.mb-0  { margin-bottom: 0; }
.mb-1  { margin-bottom: var(--space-1); }
.mb-2  { margin-bottom: var(--space-2); }
.mb-3  { margin-bottom: var(--space-3); }
.mb-4  { margin-bottom: var(--space-4); }
.mt-4  { margin-top: var(--space-4); }

.p-0   { padding: 0 !important; }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted) !important; }
.text-small  { font-size: var(--font-size-sm); }

.table-responsive { overflow-x: auto; }

/* ── Responsive ────────────────────────────────────────────── */
@media (min-width: 48rem) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .module-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 64rem) {
    .bottom-nav { display: none; }
    .sidebar    { display: flex; flex-direction: column; }
    .main-content {
        margin-left: var(--sidebar-width);
        padding-bottom: var(--space-8);
    }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .module-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Virtuelle Tastatur auf Mobilgeräten: Bottom-Navigation temporär ausblenden */
body.keyboard-open .bottom-nav {
    transform: translateY(120%);
    pointer-events: none;
}

@media (min-width: 80rem) {
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .module-grid { grid-template-columns: repeat(5, 1fr); }
}