* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    font-family: system-ui, sans-serif;
    background: #121212;      /* dark gray background */
    color: #e5e5e5;           /* light gray text */
}

.top {
    text-align: center;
    margin-bottom: 16px;
}

.top h1 {
    margin: 0;
    color: #ffffff;          /* Expense Splitter title in white */
}

.top p {
    margin: 4px 0 0;
    color: #b3b3b3;
}

.card {
    width: min(600px, 100%);
    background: #1e1e1e;     /* card dark gray */
    padding: 18px;
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.6);
}

.rowForm {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

input,
select {
    flex: 1;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid #3a3a3a;
    background: #2a2a2a;
    color: #ffffff;
}

input::placeholder {
    color: #9ca3af;
}

button {
    padding: 10px 14px;
    border-radius: 10px;
    border: none;
    background: #3f3f46;     /* neutral gray button */
    color: #ffffff;
    cursor: pointer;
}

button:hover {
    background: #52525b;
}

section {
    margin-top: 16px;
}

section h3 {
    margin: 0 0 6px;
    font-size: 14px;
    color: #d4d4d8;
}

.list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
}

.list li {
    padding: 10px;
    border-radius: 10px;
    background: #262626;
    color: #e5e5e5;
}

.summary li {
    background: #1f2937;
    color: #f9fafb;
}