:root {
    --italy-green: #008C45;
    --italy-white: #F4F5F0;
    --italy-red: #CD212A;
    --text-dark: #2C3E50;
    --text-muted: #6c757d;
    --bg-light: #f8f9fa;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --card-hover-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Playfair Display', serif;
}

body {
    font-family: var(--font-primary);
    background-color: var(--italy-white);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
}

.navbar {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 1rem 0;
}

.navbar-brand {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--italy-green) !important;
}

.navbar-brand span {
    color: var(--italy-red);
}

.nav-link {
    font-weight: 500;
    color: var(--text-dark) !important;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--italy-green) !important;
}

.btn-primary {
    background-color: var(--italy-green);
    border-color: var(--italy-green);
}

.btn-primary:hover {
    background-color: #006e36;
    border-color: #006e36;
}

.btn-danger {
    background-color: var(--italy-red);
    border-color: var(--italy-red);
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    background: #ffffff;
}

.card:hover { /* Only hover effect if desired, mainly for interactive cards */
    /* transform: translateY(-5px); */
    /* box-shadow: var(--card-hover-shadow); */
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    font-weight: 600;
}

/* Flashcard Specifics */
.flashcard-container {
    perspective: 1000px;
}

.flashcard {
    position: relative;
    width: 100%;
    height: 300px;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    background: white;
    padding: 2rem;
}

.flashcard-front {
    border-bottom: 5px solid var(--italy-green);
}

.flashcard-back {
    transform: rotateY(180deg);
    background-color: var(--bg-light);
    border-bottom: 5px solid var(--italy-red);
}

.display-word {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

.flag-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

/* Footer */
footer {
    margin-top: auto;
    background-color: #ffffff;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-muted);
}