* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #101820;
    color: white;
}

.app {
    max-width: 1000px;
    margin: 0 auto;
    padding: 24px;
}

.panel {
    max-width: 520px;
    margin: 80px auto;
    padding: 32px;
    background: #1f2d3a;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

h1, h2, h3 {
    margin-top: 0;
}

.subtitle {
    font-size: 22px;
    color: #ffd166;
    margin-top: -10px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 18px 0;
    border: none;
    border-radius: 8px;
    font-size: 16px;
}

button {
    padding: 12px 18px;
    border: none;
    border-radius: 8px;
    background: #06d6a0;
    color: #06231b;
    font-weight: bold;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #00b887;
}

.hidden {
    display: none;
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    background: #1f2d3a;
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 12px;
}

.message-box {
    background: #293b4a;
    padding: 14px;
    border-radius: 12px;
    margin-bottom: 12px;
    text-align: center;
    color: #ffd166;
    font-weight: bold;
}

canvas {
    width: 100%;
    background: #d8e2dc;
    border-radius: 16px;
    display: block;
}

.controls {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 14px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

th, td {
    padding: 10px;
    border-bottom: 1px solid #3a4c5c;
}

.leaderboards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-top: 20px;
}

.leaderboards table {
    font-size: 14px;
}

#serverStatus {
    font-size: 14px;
    color: #ffd166;
}

select {
    width: 100%;
    padding: 12px;
    margin: 10px 0 18px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
}

label {
    display: block;
    text-align: left;
    margin-top: 8px;
    font-weight: bold;
}

.bus-preview {
    margin: 14px 0 20px;
    padding: 14px;
    background: #15232f;
    border-radius: 14px;
}

#busPreviewCanvas {
    width: 100%;
    max-width: 360px;
    background: #d8e2dc;
    border-radius: 12px;
    display: block;
    margin: 0 auto;
}

#busPreviewName {
    margin: 10px 0 0;
    color: #ffd166;
    font-weight: bold;
}