:root {
    --primary-color: #5b6cfd;
    --secondary-color: #ff7e5f;
    --background-color: #f0f2f5;
    --text-color: #333;
    --container-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 1rem;
    box-sizing: border-box;
}

.container {
    background: var(--container-bg);
    padding: 2.5em;
    border-radius: 15px;
    box-shadow: 0 10px 25px var(--shadow-color);
    width: 100%;
    max-width: 500px;
    text-align: center;
    transition: all 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px var(--shadow-color);
}

.logo {
    max-width: 150px;
    margin-bottom: 1em;
}

h1 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 0.25em;
    font-weight: 600;
}

.subtitle {
    margin-bottom: 2em;
    color: #666;
    font-weight: 300;
}

.form-group {
    margin-bottom: 1.5em;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5em;
    font-weight: 400;
    color: #555;
}

input[type="number"],
select {
    width: 100%;
    padding: 0.8em 1em;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: 'Poppins', sans-serif;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(91, 108, 253, 0.25);
}

button {
    width: 100%;
    padding: 1em;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 1em;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 126, 95, 0.3);
}

#result {
    margin-top: 2em;
    text-align: left;
    transition: opacity 0.5s ease;
}

#result.hidden {
    display: none;
}

#result h2 {
    color: var(--primary-color);
    font-size: 1.2em;
    margin-bottom: 1em;
    border-bottom: 2px solid var(--background-color);
    padding-bottom: 0.5em;
}

#suitcase-list {
    list-style: none;
    padding-left: 0;
}

#suitcase-list li {
    background: var(--background-color);
    margin-bottom: 0.75em;
    padding: 0.8em 1em;
    border-radius: 8px;
    border-left: 5px solid var(--primary-color);
    animation: fadeIn 0.5s ease forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}