:root {
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --text-light: #fff;
    --highlight: #f9a826;
    --slot-border: #4a4a6a;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-light);
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

header {
    text-align: center;
    margin-bottom: 60px;
}

h1 {
    font-size: 3.5em;
    color: var(--highlight);
    text-shadow: 0 0 20px rgba(249, 168, 38, 0.4);
    margin: 0 0 10px 0;
    letter-spacing: 4px;
}

.subtitle {
    color: #a0a0b0;
    font-size: 1.2em;
    margin: 0;
    letter-spacing: 2px;
}

.hub-container {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 1100px;
    width: 100%;
}

.hub-card {
    position: relative;
    background-color: var(--card-bg);
    border: 2px solid var(--slot-border);
    border-radius: 20px;
    padding: 40px 30px;
    width: 280px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    text-decoration: none;
    color: var(--text-light);
    overflow: hidden;
}

.hub-card:hover {
    transform: translateY(-12px);
    border-color: var(--highlight);
    box-shadow: 0 20px 40px rgba(249, 168, 38, 0.25);
}

.hub-card:hover .card-glow {
    opacity: 1;
}

.hub-card:hover .card-icon img {
    transform: scale(1.15) rotate(3deg);
    filter: drop-shadow(0 0 18px rgba(249, 168, 38, 0.6));
}

.card-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(249, 168, 38, 0.07) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.card-icon {
    margin-bottom: 25px;
}

.card-icon img {
    width: 110px;
    height: 110px;
    object-fit: contain;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.5));
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.hub-card h2 {
    font-size: 1.6em;
    letter-spacing: 3px;
    margin: 0 0 10px 0;
    color: var(--text-light);
    transition: color 0.3s ease;
}

.hub-card:hover h2 {
    color: var(--highlight);
}

.card-desc {
    color: #a0a0b0;
    font-size: 0.95em;
    margin: 0;
    letter-spacing: 1px;
}

/* Disabled card (World Boss) */
.hub-card.disabled {
    filter: grayscale(70%) opacity(0.6);
    cursor: not-allowed;
    pointer-events: none;
}

.hub-card.disabled:hover {
    transform: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    border-color: var(--slot-border);
}

/* Locked card */
.hub-card.locked {
    filter: grayscale(85%) opacity(0.45);
    cursor: not-allowed;
    pointer-events: none;
    border-color: #3a3a5a;
}

/* Lock badge */
.lock-badge {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(30, 30, 50, 0.9);
    color: #8892a4;
    font-size: 0.68em;
    font-weight: bold;
    padding: 4px 14px;
    border-radius: 20px;
    letter-spacing: 1px;
    z-index: 10;
    border: 1px solid #4a4a6a;
    white-space: nowrap;
}

/* WIP badge */
.wip-badge {
    position: absolute;
    top: 18px;
    right: -30px;
    background: #e74c3c;
    color: white;
    font-size: 0.7em;
    font-weight: bold;
    padding: 5px 40px;
    transform: rotate(45deg);
    letter-spacing: 1px;
    z-index: 10;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

/* Mobile */
@media (max-width: 768px) {
    h1 {
        font-size: 2.2em;
    }

    .hub-container {
        gap: 20px;
    }

    .hub-card {
        width: calc(50% - 20px);
        min-width: 140px;
        padding: 25px 15px;
    }

    .card-icon img {
        width: 80px;
        height: 80px;
    }

    .hub-card h2 {
        font-size: 1.1em;
        letter-spacing: 2px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8em;
    }

    header {
        margin-bottom: 35px;
    }

    .hub-card {
        width: 100%;
        max-width: 300px;
        padding: 25px 20px;
    }
}