/* ================= GLOBAL RESETS & VARIABLES ================= */
:root {
    --bg-darker: #0a0a0a;
    --bg-dark: #121212;
    --bg-card: #1a1a1a;
    --bg-card-hover: #222222;
    --teal: #00f2ff;
    --teal-glow: rgba(0, 242, 255, 0.25);
    --text-main: #ffffff;
    --text-muted: #888888;
    --border-color: #262626;
    
    /* Copter Badge Colors */
    --badge-ship: #3b82f6;
    --badge-swing: #a855f7;
    --badge-ufo: #eab308;
    --badge-cube: #22c55e;
    --badge-robot: #ef4444;
    --badge-robtop: #ec4899;
    --badge-spider: #c203fc;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-darker);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ================= SCROLLBARS ================= */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
    background: #333;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--teal);
}

/* ================= LAYOUT CONTAINER ================= */
.container {
    max-width: 1200px;
    margin: 100px auto 40px auto;
    padding: 0 20px;
}

/* New Structural Class: Add this container class around your list view section if needed */
.main-content {
    height: calc(100vh - 140px); /* Locks view directly inside standard viewport boundaries */
    overflow: hidden;
}

.hidden {
    display: none !important;
}
.max-w-md {
    max-width: 600px;
    margin: 0 auto;
}

/* ================= NAVIGATION BAR ================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background-color: rgba(18, 18, 18, 0.95);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: border-color 0.3s ease;
}
.navbar.in-use {
    border-bottom-color: var(--teal);
}
.nav-logo {
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: 2px;
    cursor: pointer;
    color: var(--text-main);
}
.nav-links {
    display: flex;
    gap: 30px;
}
.nav-item {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s, border-bottom 0.2s;
    padding: 22px 0;
    border-bottom: 3px solid transparent;
}
.nav-item:hover, .nav-item.active {
    color: var(--teal);
}
.nav-item.active {
    border-bottom: 3px solid var(--teal);
}

/* ================= LANDING PAGE ================= */
.page-center {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    text-align: center;
}
.landing-container h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 15px;
    letter-spacing: -1px;
}
.glow-text {
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}
.accent-text {
    color: var(--teal);
    text-shadow: 0 0 30px var(--teal-glow);
}
.subtitle {
    color: var(--text-muted);
    font-size: 1.2rem;
    margin-bottom: 40px;
    max-width: 600px;
}

/* ================= BUTTONS ================= */
.btn-primary {
    background-color: transparent;
    color: var(--teal);
    border: 2px solid var(--teal);
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 15px var(--teal-glow);
}
.btn-primary:hover {
    background-color: var(--teal);
    color: var(--bg-darker);
    box-shadow: 0 0 30px var(--teal);
    transform: translateY(-2px);
}

/* ================= CHALLENGE LIST SPLIT LAYOUT ================= */
.list-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 25px;
    height: calc(100vh - 160px); /* Constrains dynamic height engine completely */
}
.list-sidebar {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow-y: auto; /* Activates separate rail layout tracking */
    max-height: 100%;  /* Keeps box heights perfectly proportional */
    padding: 15px;
}
.list-detail-panel {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 30px;
    overflow-y: auto; /* Detail cards can scroll safely now */
    max-height: 100%;
    position: relative;
}

/* ================= LEVEL CARD ITEMS ================= */
.level-item {
    background-color: var(--bg-card);
    border: 1px solid transparent;
    border-left: 4px solid var(--border-color);
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
}
.level-item:hover {
    background-color: var(--bg-card-hover);
    border-left-color: var(--text-muted);
}
.level-item.active {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color);
    border-left-color: var(--teal);
    box-shadow: 0 0 15px rgba(0, 242, 255, 0.05);
}
.level-info-meta {
    display: flex;
    flex-direction: column;
}
.level-title-row {
    font-weight: 600;
    font-size: 1.05rem;
}
.level-rank {
    color: var(--teal);
    margin-right: 8px;
    font-weight: 800;
}
.level-creator {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* GAME MODE BADGES */
.badge {
    font-size: 0.7rem;
    font-weight: 800;
    padding: 4px 8px;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-ship { background-color: rgba(59, 130, 246, 0.15); color: var(--badge-ship); border: 1px solid var(--badge-ship); }
.badge-swing { background-color: rgba(168, 85, 247, 0.15); color: var(--badge-swing); border: 1px solid var(--badge-swing); }
.badge-ufo { background-color: rgba(234, 179, 8, 0.15); color: var(--badge-ufo); border: 1px solid var(--badge-ufo); }
.badge-cube { background-color: rgba(34, 197, 94, 0.15); color: var(--badge-cube); border: 1px solid var(--badge-cube); }
.badge-robot { background-color: rgba(239, 68, 68, 0.15); color: var(--badge-robot); border: 1px solid var(--badge-robot); }
.badge-robtop { background-color: rgba(236, 72, 153, 0.15); color: var(--badge-robtop); border: 1px solid var(--badge-robtop); }
.badge-spider { background-color: rgba(194, 3, 252, 0.15); color: var(--badge-spider); border: 1px solid var(--badge-spider); }

/* ================= DETAIL VIEW COMPONENTS ================= */
.panel-placeholder {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
}
.detail-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 20px;
}
.detail-title {
    font-size: 2rem;
    font-weight: 800;
}
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    margin-bottom: 25px;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.no-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-card);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-muted);
}
.detail-description {
    background-color: var(--bg-card);
    padding: 15px 20px;
    border-left: 3px solid var(--teal);
    border-radius: 0 4px 4px 0;
    margin-bottom: 25px;
}

/* ================= STANDARD CARDS & TABLES ================= */
.card {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 35px;
}
.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 25px;
    border-left: 4px solid var(--teal);
    padding-left: 15px;
}
.table-wrapper {
    width: 100%;
    overflow-x: auto;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}
.data-table th {
    padding: 15px;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
}
.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}
.data-table tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* ================= FORMS ================= */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 8px;
    color: var(--text-muted);
}
.form-group input {
    width: 100%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    color: white;
    font-family: inherit;
    border-radius: 4px;
    transition: border-color 0.2s;
}
.form-group input:focus {
    outline: none;
    border-color: var(--teal);
}

/* ================= RESPONSIVENESS ================= */
@media (max-width: 900px) {
    .list-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    .list-sidebar {
        height: 300px;
    }
    .navbar {
        padding: 0 20px;
    }
    .nav-links {
        gap: 15px;
    }
    .landing-container h1 {
        font-size: 2.5rem;
    }
}