:root {
    --bg-color: #0f0f11;
    --surface-color: #1a1a1e;
    --surface-hover: #232329;
    --primary-color: #e53935; /* Fire Red */
    --primary-hover: #f44336;
    --secondary-color: #ff9800; /* Fire Orange */
    --text-main: #ffffff;
    --text-muted: #9aa0a6;
    --success-color: #4caf50;
    --danger-color: #f44336;
    --border-color: #2a2a30;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 15px rgba(229, 57, 53, 0.2);
    --border-radius: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utils */
.hidden { display: none !important; }
.text-danger { color: var(--danger-color); }
.text-success { color: var(--success-color); }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }

/* Typography */
h1, h2, h3 { font-weight: 600; margin-bottom: 1rem; }
h1 { font-size: 2rem; color: var(--text-main); }
h2 { font-size: 1.5rem; color: var(--text-muted); }

/* Buttons */
.btn {
    background-color: var(--surface-hover);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn:hover {
    background-color: #2c2c34;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #c62828);
    color: white;
    border: none;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(229, 57, 53, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), #f57c00);
    color: white;
    border: none;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #ffb74d, var(--secondary-color));
    transform: translateY(-2px);
}

/* Forms */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    background-color: #121215;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(229, 57, 53, 0.2);
}

/* Cards */
.card {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Login View */
#login-view {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-height: 100vh;
    background: radial-gradient(circle at center, #1a1a1e 0%, #0f0f11 100%);
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-muted);
}

/* App View */
#app-view {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-size: 1.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand span {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 1rem;
}

.nav-item {
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    cursor: pointer;
}

.nav-item:hover, .nav-item.active {
    background-color: rgba(229, 57, 53, 0.1);
    color: var(--primary-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.badge {
    background-color: var(--secondary-color);
    color: #000;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    text-transform: uppercase;
}

.badge.admin {
    background-color: var(--primary-color);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Dashboard Layout */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    text-align: center;
    padding: 2rem;
}

.stat-card h3 {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
}

.stat-value.positive { color: var(--success-color); }
.stat-value.negative { color: var(--danger-color); }

/* Tables */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.alert-error {
    background-color: rgba(244, 67, 54, 0.1);
    border-left-color: var(--danger-color);
    color: #ffcdd2;
}

.alert-success {
    background-color: rgba(76, 175, 80, 0.1);
    border-left-color: var(--success-color);
    color: #c8e6c9;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: row;
        padding: 0.8rem 1rem;
        flex-wrap: wrap;
    }
    .nav-brand {
        font-size: 1.1rem;
    }
    
    /* Mobilní spodní navigační lišta */
    .nav-menu {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background-color: var(--surface-color);
        border-top: 1px solid var(--border-color);
        display: flex;
        justify-content: flex-start;
        padding: 0.5rem 0.8rem;
        z-index: 1000;
        margin: 0;
        width: 100%;
        box-shadow: 0 -4px 15px rgba(0,0,0,0.4);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
        -ms-overflow-style: none;  /* IE and Edge */
    }

    .nav-menu::-webkit-scrollbar {
        display: none; /* Chrome, Safari and Opera */
    }
    
    .nav-item {
        font-size: 0.75rem;
        padding: 0.6rem 0.8rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        flex: 0 0 auto;
        white-space: nowrap;
        border-radius: 10px;
        min-width: 80px;
    }

    .main-content {
        padding: 1rem;
        padding-bottom: 6rem; /* Místo pro spodní menu */
    }

    .grid-2, .dashboard-grid {
        grid-template-columns: 1fr;
    }

    /* Zmenšení tabulek pro mobily */
    th, td {
        padding: 0.6rem 0.4rem;
        font-size: 0.85rem;
    }

    /* Akční tlačítka v tabulce - zachovat vedle sebe a menší */
    td .btn, td button {
        padding: 0.3rem 0.5rem !important;
        font-size: 0.75rem !important;
        margin-bottom: 0.2rem;
    }

    /* Všechna hlavní tlačítka roztažená přes celou šířku pro snadné klikání */
    form .btn {
        width: 100%;
        margin-top: 0.5rem;
        padding: 1rem;
        font-size: 1.1rem;
    }
}

/* Kalendář */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    border: 1px solid var(--border-color);
    min-width: 600px;
}

.calendar-day-head {
    background-color: var(--surface-hover);
    padding: 0.5rem;
    text-align: center;
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--text-muted);
}

.calendar-day {
    background-color: var(--surface-color);
    min-height: 90px;
    padding: 0.4rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.calendar-day.today {
    background-color: rgba(229, 57, 53, 0.05);
}

.calendar-day.empty {
    background-color: transparent;
}

.day-number {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: bold;
}

.cleaner-tag {
    background-color: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 4px 6px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cleaner-tag .delete-btn {
    margin-left: 6px;
    cursor: pointer;
    font-weight: bold;
    background: rgba(0,0,0,0.2);
    border-radius: 50%;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
}

.cleaner-tag .delete-btn:hover {
    background: rgba(0,0,0,0.4);
}

.reservation-tag {
    background-color: var(--secondary-color) !important;
    color: #000 !important;
    font-weight: 500;
}