:root {
    --blue: #6699cc;
    --pink: #ffb6c1;
    --background: #f8f9fa;
    --text: #343a40;
    --card: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background);
    color: var(--text);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: linear-gradient(to right, var(--blue), var(--pink));
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    box-shadow: 0 2px 5px var(--shadow);
}

h1 {
    margin: 0;
    font-size: 2rem;
}

.subtitle {
    font-size: 1rem;
    font-weight: 300;
    margin-top: 0.5rem;
}

main {
    flex: 1;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.twin-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
}

.twin-card {
    background-color: var(--card);
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow);
    padding: 1.5rem;
    flex: 1;
    min-width: 280px;
    max-width: 500px;
}

.twin-card h2 {
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.ollie {
    border-top: 5px solid var(--blue);
}

.ollie h2 {
    color: var(--blue);
}

.isla {
    border-top: 5px solid var(--pink);
}

.isla h2 {
    color: var(--pink);
}

.hiccup-form {
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="datetime-local"], 
input[type="number"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 5px;
    font-size: 1rem;
    box-sizing: border-box;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
    display: block;
    width: 100%;
}

button:hover {
    background-color: #3e8e41;
}

.hiccup-history {
    margin-top: 2rem;
}

.hiccup-entry {
    background-color: #f1f3f5;
    border-radius: 5px;
    padding: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hiccup-delete {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.8rem;
}

.hiccup-delete:hover {
    background-color: #bd2130;
}

.stats-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
    justify-content: space-between;
}

.stat-card {
    background-color: var(--card);
    border-radius: 10px;
    box-shadow: 0 2px 5px var(--shadow);
    padding: 1.5rem;
    flex: 1;
    min-width: 280px;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin: 0.5rem 0;
}

.stat-label {
    font-size: 0.9rem;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 1px;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--text);
    color: white;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .twin-container {
        flex-direction: column;
    }
    
    .twin-card {
        max-width: 100%;
    }
    
    header {
        padding: 1rem 0;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}