/* English comments are mandatory. */
/* Layout — the app shell (dark sidebar + header + content), the auth pages and the landing (from Slovoprav's layout.css). */

/* --- App shell --- */
.app-layout { display: flex; min-height: 100vh; }

.app-main {
    flex: 1;
    min-width: 0; /* a wide table must scroll inside its wrapper, not widen the shell */
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition-slow);
}
.app-layout.sidebar-collapsed .app-main { margin-left: var(--sidebar-collapsed); }

/* --- Sidebar --- */
.sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: width var(--transition-slow);
    overflow-x: hidden;
    overflow-y: auto;
}
.sidebar-collapsed .sidebar { width: var(--sidebar-collapsed); }

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    min-height: var(--header-height);
    text-decoration: none;
}
.sidebar-logo-icon { flex-shrink: 0; width: 28px; display: flex; align-items: center; justify-content: center; }
.sidebar-logo-icon svg { width: 26px; height: 26px; }
.sidebar-logo-text {
    font-family: var(--font-display);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-sidebar-active);
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--transition);
}
.sidebar-collapsed .sidebar-logo-text { opacity: 0; width: 0; }

.sidebar-nav { flex: 1; padding: var(--space-3); overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.sidebar-section-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-4) var(--space-3) var(--space-2);
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--transition);
}
.sidebar-collapsed .sidebar-section-label { opacity: 0; height: 0; padding: 0; margin: 0; }
.sidebar-divider { height: 1px; background: rgba(255, 255, 255, 0.06); margin: var(--space-2) var(--space-3); }

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    color: var(--text-sidebar);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    white-space: nowrap;
    transition: background var(--transition), color var(--transition);
    position: relative;
}
.sidebar-link:hover { background: var(--bg-sidebar-hover); color: var(--text-sidebar-active); }
.sidebar-link.active { background: var(--bg-sidebar-active); color: var(--text-sidebar-active); }
.sidebar-link:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.sidebar-link.active::before {
    content: '';
    position: absolute;
    left: -12px; top: 50%;
    transform: translateY(-50%);
    width: 3px; height: 20px;
    background: var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.sidebar-link-icon { flex-shrink: 0; width: 24px; display: flex; align-items: center; justify-content: center; }
.sidebar-link-icon svg { width: 20px; height: 20px; }
.sidebar-link-text { overflow: hidden; transition: opacity var(--transition); }
.sidebar-collapsed .sidebar-link-text { opacity: 0; width: 0; }

.sidebar-foot {
    padding: var(--space-3) var(--space-5);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    overflow: hidden;
}
.sidebar-collapsed .sidebar-foot { opacity: 0; }

.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--text-sidebar);
    cursor: pointer;
    transition: color var(--transition);
}
.sidebar-toggle:hover { color: var(--text-sidebar-active); }
.sidebar-toggle svg { width: 18px; height: 18px; transition: transform var(--transition-slow); }
.sidebar-collapsed .sidebar-toggle svg { transform: rotate(180deg); }

/* Tooltip for the collapsed sidebar */
.sidebar-collapsed .sidebar-link[data-tooltip]::after {
    content: attr(data-tooltip);
    position: fixed;
    left: calc(var(--sidebar-collapsed) + 8px);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    white-space: nowrap;
    z-index: 200;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition);
}
.sidebar-collapsed .sidebar-link[data-tooltip]:hover::after { opacity: 1; }

/* --- Header --- */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-6);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}
.header-left { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }
.header-right { display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0; }

.breadcrumbs { display: flex; align-items: center; gap: var(--space-2); font-size: var(--font-size-sm); color: var(--text-muted); overflow: hidden; }
.breadcrumbs a { color: var(--text-muted); white-space: nowrap; }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs-separator { color: var(--text-muted); flex-shrink: 0; }
.breadcrumbs-current { color: var(--text-primary); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.header-user { display: flex; align-items: center; gap: var(--space-3); font-size: var(--font-size-sm); color: var(--text-secondary); }
.header-user-email { max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.theme-toggle, .hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
}
.theme-toggle:hover, .hamburger:hover { background: var(--bg-hover); color: var(--text-primary); }
.theme-toggle svg, .hamburger svg { width: 20px; height: 20px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
.hamburger { display: none; }

/* --- Page content --- */
#page-content {
    flex: 1;
    padding: var(--space-6);
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    gap: var(--space-4);
    flex-wrap: wrap;
}
.page-header h1 { font-size: var(--font-size-2xl); }
.page-header-meta { color: var(--text-muted); font-size: var(--font-size-sm); margin-top: var(--space-1); }
.page-header-actions { display: flex; gap: var(--space-2); flex-shrink: 0; flex-wrap: wrap; align-items: center; }

/* --- Auth pages (no sidebar) --- */
.auth-layout {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-6);
    background: var(--bg-primary);
}
.auth-layout #page-content { display: flex; flex-direction: column; align-items: center; justify-content: center; max-width: none; padding: 0; margin: 0; gap: var(--space-4); }
.auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-10) var(--space-8);
}
.auth-logo { display: flex; align-items: center; justify-content: center; gap: var(--space-3); margin-bottom: var(--space-8); text-decoration: none; }
.auth-logo-icon { flex-shrink: 0; width: 32px; height: 32px; }
.auth-logo-icon svg { width: 32px; height: 32px; display: block; }
.auth-logo-title { font-family: var(--font-display); font-size: var(--font-size-2xl); font-weight: 700; color: var(--text-primary); }
.auth-title { font-size: var(--font-size-xl); text-align: center; margin-bottom: var(--space-6); }
.auth-card .btn-block { width: 100%; margin-top: var(--space-2); }
.auth-footer { text-align: center; margin-top: var(--space-6); font-size: var(--font-size-sm); color: var(--text-muted); }
.auth-footer a { font-weight: 500; }
.auth-footer .sep { margin: 0 var(--space-2); }
.auth-layout .alert { width: 100%; max-width: 440px; }

/* --- Landing (guests) --- */
.landing-layout { min-height: 100vh; display: flex; flex-direction: column; background: var(--bg-primary); }
.landing-header { display: flex; align-items: center; justify-content: space-between; padding: var(--space-4) var(--space-6); max-width: 1120px; width: 100%; margin: 0 auto; }
.landing-logo { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; }
.landing-logo svg { width: 28px; height: 28px; }
.landing-logo-text { font-family: var(--font-display); font-size: var(--font-size-lg); font-weight: 700; color: var(--text-primary); }
.landing-nav { display: flex; align-items: center; gap: var(--space-2); }
.landing-layout #page-content { max-width: 1120px; padding: var(--space-8) var(--space-6) var(--space-12); }
.hero { padding: var(--space-10) 0 var(--space-8); max-width: 720px; }
.hero h1 { font-size: var(--font-size-3xl); line-height: 1.2; margin-bottom: var(--space-4); }
.hero-lead { font-size: var(--font-size-lg); color: var(--text-secondary); margin-bottom: var(--space-6); }
.hero-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; align-items: center; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--space-4); margin-top: var(--space-8); }
.feature { background: var(--bg-card); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg); padding: var(--space-5); box-shadow: var(--shadow-sm); }
.feature-icon { width: 36px; height: 36px; border-radius: var(--radius-md); background: var(--accent-subtle); color: var(--accent); display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-3); }
.feature-icon svg { width: 20px; height: 20px; }
.feature h3 { margin-bottom: var(--space-2); }
.feature p { font-size: var(--font-size-sm); margin: 0; }
.landing-footer { padding: var(--space-6); text-align: center; color: var(--text-muted); font-size: var(--font-size-sm); border-top: 1px solid var(--border-subtle); }

/* --- Sidebar overlay (mobile) --- */
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: 90; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .app-main { margin-left: var(--sidebar-collapsed); }
    .sidebar { width: var(--sidebar-collapsed); }
    .sidebar-logo-text, .sidebar-link-text, .sidebar-section-label { opacity: 0; width: 0; height: auto; padding-top: 0; padding-bottom: 0; }
    .sidebar-foot { opacity: 0; }
    .sidebar:hover { width: var(--sidebar-width); }
    .sidebar:hover .sidebar-logo-text, .sidebar:hover .sidebar-link-text { opacity: 1; width: auto; }
    .sidebar:hover .sidebar-section-label { opacity: 1; height: auto; padding: var(--space-4) var(--space-3) var(--space-2); }
    .sidebar:hover .sidebar-foot { opacity: 1; }
}

@media (max-width: 768px) {
    .hamburger { display: flex; }
    .sidebar { width: var(--sidebar-width); transform: translateX(-100%); transition: transform var(--transition-slow); }
    .sidebar-open .sidebar { transform: translateX(0); }
    .sidebar-open .sidebar .sidebar-logo-text, .sidebar-open .sidebar .sidebar-link-text { opacity: 1; width: auto; }
    .sidebar-open .sidebar .sidebar-section-label { opacity: 1; width: auto; height: auto; padding: var(--space-4) var(--space-3) var(--space-2); }
    .sidebar-open .sidebar .sidebar-foot { opacity: 1; }
    .sidebar-toggle { display: none; }
    .sidebar-open .sidebar-overlay { display: block; }
    .app-main { margin-left: 0; }
    .app-header { padding: 0 var(--space-4); }
    #page-content { padding: var(--space-4); }
    .header-user-email { display: none; }
    .page-header-actions { width: 100%; flex-shrink: 1; }
    .page-header-actions .btn { flex: 1 1 auto; }
    .breadcrumbs a, .breadcrumbs-separator { display: none; }
    .btn, .theme-toggle, .hamburger { min-height: 40px; }
    .auth-card { padding: var(--space-8) var(--space-5); }
    /* The logo and the three nav buttons do not fit a phone side by side: the nav wraps under the logo, right-aligned. */
    .landing-header { padding: var(--space-3) var(--space-4); flex-wrap: wrap; gap: var(--space-2) var(--space-3); }
    .landing-nav { margin-left: auto; }
    .landing-layout #page-content { padding: var(--space-6) var(--space-4) var(--space-10); }
    .hero h1 { font-size: var(--font-size-2xl); }
}

@media (max-width: 480px) {
    .landing-nav { gap: var(--space-1); }
    .landing-nav .btn { font-size: var(--font-size-sm); padding: var(--space-1) var(--space-3); }
}
@media (max-width: 359px) { .breadcrumbs { display: none; } }
@media (min-width: 1440px) { #page-content { max-width: 1400px; } }