/* --- Osnovni stilovi --- */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1, h2, h3 {
    color: #2c3e50;
}

h2 {
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 5px;
    margin-top: 30px;
}

/* --- Navigacioni Meni --- */
.nav-menu {
    background-color: #ecf0f1;
    padding: 10px 0;
    margin-bottom: 20px;
    border-radius: 4px;
    text-align: center;
    overflow: hidden;
}

.nav-menu a {
    text-decoration: none;
    color: #2c3e50;
    padding: 10px 15px;
    margin: 0 5px;
    font-weight: 500;
    display: inline-block;
    border-radius: 3px;
    transition: background-color 0.2s;
}

.nav-menu a:hover {
    background-color: #bdc3c7;
}

/* Aktivni link koristi Brend Plavu */
.nav-menu a.active {
    font-weight: 700;
    color: #3498db; 
}

/* Odjava koristi Brend Crvenu */
.nav-menu .logout-link {
    float: right;
    margin-right: 15px;
    color: #e74c3c; 
    font-weight: bold;
}

.nav-menu .logout-link:hover {
    background-color: #c0392b;
    color: white;
}

/* --- Tabele (za pregled artikala) --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px;
    border: 1px solid #ddd;
    text-align: left;
    font-size: 14px;
}

th {
    background-color: #f2f2f2;
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

tr:hover {
    background-color: #f1f1f1;
}

/* --- Forme i Sekcije --- */
.detalji-sekcija {
    margin-bottom: 25px;
    padding: 20px;
    background: #fdfdfd;
    border: 1px solid #eee;
    border-radius: 5px;
}

.forma-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    align-items: end;
}

.forma-grid-full {
    grid-column: 1 / -1;
}

.forma-grid label {
    display: block;
    font-weight: 500;
    margin-bottom: 5px;
    font-size: 14px;
}

.forma-grid input[type="text"],
.forma-grid input[type="number"],
.forma-grid select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

/* --- Dugmad (Stilizovana po brend bojama) --- */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.85;
}

.btn-primary {
    background-color: #3498db; /* Brend Plava */
    color: white;
}

.btn-danger {
    background-color: #e74c3c; /* Brend Crvena */
    color: white;
}

.btn-success {
    background-color: #27ae60; /* Zelena za uspeh */
    color: white;
}

.btn-warning {
    background-color: #e67e22; /* Narandžasta za upozorenja */
    color: white;
}

/* --- Flash Poruke --- */
.flash-message {
    padding: 10px; 
    margin-bottom: 15px; 
    border-radius: 4px;
    background-color: #eafaf1; 
    color: #1f7c4d; 
    border: 1px solid #a1e7c5;
}

.flash-message.error {
    background-color: #fdecea; 
    color: #a13a35; 
    border: 1px solid #f5b9b6;
}

/* --- Login Forma --- */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-card {
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 350px;
    text-align: center;
}

.login-card img {
    max-width: 120px;
    margin-bottom: 20px;
}

.login-card h2 {
    margin-top: 0;
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 25px;
    color: #2c3e50;
}

.login-form-group {
    margin-bottom: 15px;
    text-align: left;
}

.login-form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 14px;
    color: #555;
}

.login-form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 14px;
}

.login-card .btn {
    width: 100%;
    margin-top: 10px;
    padding: 12px;
    font-size: 16px;
}

/* --- Podmeni za Izveštaje (Tabovi) --- */
.sub-nav {
    margin-bottom: 25px;
    border-bottom: 2px solid #ddd;
    padding-bottom: 2px;
}

.sub-nav a {
    padding: 10px 20px;
    margin-right: 5px;
    text-decoration: none;
    color: #7f8c8d;
    font-weight: bold;
    display: inline-block;
    border-radius: 5px 5px 0 0;
    transition: background 0.2s, color 0.2s;
}

.sub-nav a:hover {
    background: #ecf0f1;
    color: #2c3e50;
}

.sub-nav a.active {
    color: #3498db; /* Brend Plava */
    border-bottom: 3px solid #3498db;
    background: #fff;
}