body {
    background: linear-gradient(135deg, #00ffff 0%, #ff00ff 100%);
    background-attachment: fixed;
    font-family: 'Tahoma', sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.window {
    background: #c0c0c0;
    border: 2px solid;
    border-color: #ffffff #808080 #808080 #ffffff;
    width: 100%;
    max-width: 900px;
    box-shadow: 4px 4px 10px rgba(0,0,0,0.5);
}

.title-bar {
    background: linear-gradient(90deg, #000080, #1084d0);
    padding: 3px 5px;
    color: white;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
}

.window-body {
    padding: 10px;
}

button {
    background: #c0c0c0;
    border: 2px solid;
    border-color: #ffffff #808080 #808080 #ffffff;
    padding: 5px 15px;
    font-family: 'Tahoma', sans-serif;
    cursor: pointer;
    font-weight: bold;
}

button:active, button.active {
    border-color: #808080 #ffffff #ffffff #808080;
    background: #e0e0e0;
}

.nav-tabs {
    margin-bottom: 15px;
}

.tab-content {
    display: none;
    border: 2px solid;
    border-color: #808080 #ffffff #ffffff #808080;
    padding: 15px;
    background: #ffffff;
    max-height: 75vh;
    overflow-y: auto;
}

.tab-content.active {
    display: block;
}

/* Group Stage */
#groups-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
}

.group-box {
    border: 2px solid;
    border-color: #ffffff #808080 #808080 #ffffff;
    background: #c0c0c0;
    padding: 5px;
}

.group-box h4 {
    margin: 0 0 5px 0;
    background: #008080;
    color: white;
    padding: 2px;
    text-align: center;
}

.match {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 10px;
    margin-bottom: 3px;
    font-size: 0.9em;
}

.match span:first-child { text-align: right; }
.match span:last-child { text-align: left; }

.match input {
    width: 25px;
    text-align: center;
    border: 2px inset;
}

/* Knockout Stage */
.ko-section {
    border: 2px groove #dfdfdf;
    margin-bottom: 15px;
    padding: 10px;
    background: #e8f4f8;
}

.ko-section h4 {
    margin: 0 0 5px 0;
    color: #000080;
}

.status {
    font-size: 0.85em;
    color: #ff00ff;
    font-weight: bold;
    margin-bottom: 10px;
}

.ro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 5px;
}

.team-btn {
    width: 100%;
    font-size: 0.85em;
    padding: 5px;
}

.team-btn.selected {
    background: #00ffff;
    border-color: #808080 #ffffff #ffffff #808080;
}

.team-btn:disabled {
    color: #808080;
    background: #d3d3d3;
    cursor: not-allowed;
}

.bucket {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 5px;
    min-height: 35px;
    border: 2px inset #fff;
    background: #fff;
    padding: 5px;
}

.split-bucket {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

#submit-btn {
    width: 100%;
    background: #008080;
    color: white;
    font-size: 1.2em;
    padding: 10px;
    margin-top: 15px;
}
#submit-btn:active {
    background: #005050;
}

/* Rules Box */
.rules-box {
    border: 2px inset #dfdfdf;
    background: #ffffff;
    height: 80px;
    overflow-y: auto;
    padding: 10px;
    margin-bottom: 15px;
    font-size: 0.9em;
}

.rules-box h4 {
    margin: 0 0 5px 0;
    color: #ff00ff;
}

.rules-box ul {
    margin: 0;
    padding-left: 20px;
}