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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.6;
}

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

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--gray-900);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    display: flex;
    flex-direction: column;
}

.sidebar-brand {
    padding: var(--spacing-5) var(--spacing-4);
    font-size: var(--font-size-lg);
    font-weight: 700;
    border-bottom: 1px solid var(--gray-700);
}

.sidebar-nav {
    padding: var(--spacing-4) 0;
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-5);
    color: var(--gray-300);
    font-size: var(--font-size-sm);
    transition: all 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: var(--gray-800);
    color: #fff;
    text-decoration: none;
}

.sidebar-nav a.active {
    border-right: 3px solid var(--primary);
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
}

.header {
    height: var(--header-height);
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.page-content {
    padding: var(--spacing-6);
}

/* Login page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--gray-50) 100%);
}

.login-card {
    background: #fff;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-8);
    width: 100%;
    max-width: 420px;
}

.login-card h1 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: var(--spacing-2);
}

.login-card p {
    text-align: center;
    color: var(--gray-500);
    margin-bottom: var(--spacing-6);
}

/* Sidebar bottom / logout */
.sidebar-bottom {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-4);
    border-top: 1px solid var(--gray-700);
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    background: transparent;
    border: 1px solid var(--gray-600);
    border-radius: var(--radius);
    color: var(--gray-300);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.btn-logout:hover {
    background: var(--gray-700);
    color: #fff;
}

/* Misc utility helpers used by admin pages */
.page-header { margin-bottom: var(--spacing-6); }
.page-header h1 { font-size: var(--font-size-2xl); font-weight: 700; }

.section-title { font-size: var(--font-size-lg); font-weight: 600; }

.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex { display: flex; align-items: center; }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.p-0 { padding: 0; }
.w-full { width: 100%; }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }
.text-lg { font-size: var(--font-size-lg); }
.text-muted { color: var(--gray-500); }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.font-mono { font-family: 'Courier New', monospace; }
.text-center { text-align: center; }
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.loading-state { display: flex; flex-direction: column; align-items: center; gap: var(--spacing-3); padding: var(--spacing-8); color: var(--gray-400); }

.btn-outline { background: transparent !important; border-color: var(--primary) !important; color: var(--primary) !important; }
.btn-outline:hover { background: var(--primary) !important; color: #fff !important; }
.btn-outline-danger { background: transparent; border: 1px solid var(--danger); color: var(--danger); border-radius: var(--radius); padding: var(--spacing-1) var(--spacing-3); font-size: var(--font-size-sm); cursor: pointer; }
.btn-outline-danger:hover { background: var(--danger); color: #fff; }

.alert { display: flex; align-items: flex-start; gap: var(--spacing-3); }

/* Mobile hamburger button */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--gray-700);
    flex-shrink: 0;
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
}
.sidebar-overlay.active { display: block; }

/* Responsive */
@media (max-width: 768px) {
    /* Sidebar */
    .hamburger-btn { display: flex; align-items: center; justify-content: center; }
    .sidebar {
        position: fixed;
        top: 0; left: 0; bottom: 0;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    .sidebar.open { transform: translateX(0); }

    /* Layout */
    .main-content { margin-left: 0; }
    .page-content { padding: var(--spacing-3); }

    /* Header */
    .header {
        padding: 10px 12px;
        height: auto;
        min-height: var(--header-height);
        flex-wrap: wrap;
        gap: 8px;
    }
    .header-title { font-size: 15px; flex: 1; }
    .header > div { flex-wrap: wrap; gap: 6px; }

    /* Grids → single column */
    .grid-2, .grid-3 { grid-template-columns: 1fr; }

    /* Tables → horizontal scroll */
    .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

    /* Modals → near full-screen on mobile */
    .modal { width: 96%; max-width: 96vw; margin: 8px; }
    .modal-body { padding: var(--spacing-4); }
    .modal-footer { padding: var(--spacing-3) var(--spacing-4); }

    /* Login card */
    .login-card { padding: var(--spacing-6); margin: var(--spacing-4); }
}