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

:root {
    --bg:         #0d1117;  --surface:    #161b22;  --surface2:   #21262d;
    --border:     #30363d;  --teal:       #2dd4bf;  --teal-dim:   #14b8a6;
    --teal-glow:  rgba(45,212,191,.15);  --purple:     #a855f7;  --purple-glow: rgba(168,85,247,.15);
    --text:       #e6edf3;
    --text-muted: #8b949e;  --danger:     #f85149;  --success:    #3fb950;
    --warn:       #d29922;  --radius:     10px;     --radius-sm:  6px;
    --sb-open: 560px;  --sb-right-open: clamp(680px, 48vw, 1100px);  --nav-h: 57px;
}

body {
    background: var(--bg); color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 15px; line-height: 1.6; min-height: 100vh;
}

/* ── Nav ── */
nav {
    display: flex; align-items: center; justify-content: space-between;
    padding: .75rem 1.5rem; height: var(--nav-h);
    background: var(--surface); border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
}
.nav-brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.05rem; color: var(--text); text-decoration: none; }
.nav-actions { display: flex; gap: .75rem; align-items: center; }

/* ── Page nav tabs ── */
.page-nav {
    position: relative; display: flex;
    background: var(--surface2); border: 1px solid var(--border);
    border-radius: 99px; padding: 3px; gap: 2px;
}
.page-nav-tab {
    display: flex; align-items: center; gap: .35rem;
    padding: .38rem .9rem; border-radius: 99px;
    font-size: .8rem; font-weight: 600; color: var(--teal);
    text-decoration: none; white-space: nowrap;
    transition: color .2s, background .2s;
    position: relative; z-index: 1; cursor: pointer;
    border: none; background: rgba(45,212,191,.08);
}
.page-nav-tab:hover:not(.page-nav-disabled) { color: var(--text); background: rgba(45,212,191,.14); }
.page-nav-tab.page-nav-active { color: #f0e6ff; }
.page-nav-tab.page-nav-disabled { opacity: .35; cursor: not-allowed; pointer-events: none; }
.page-nav-tab.page-nav-join  { color: #fb7185; background: rgba(251,113,133,.12); }
.page-nav-tab.page-nav-join:hover { color: #fb7185; background: rgba(251,113,133,.2); }
.page-nav-tab.page-nav-live  { color: var(--teal); background: rgba(45,212,191,.15); }
.page-nav-tab.page-nav-live:hover { color: var(--teal); background: rgba(45,212,191,.22); }
.page-nav-tab.page-nav-join.page-nav-pulse { animation: tab-pulse 1.8s ease-in-out 3; }
@keyframes tab-pulse { 0%,100% { box-shadow: none; } 50% { box-shadow: 0 0 10px rgba(251,113,133,.5); } }
.page-nav-bubble {
    position: absolute; border-radius: 99px;
    background: rgba(168,85,247,.22);
    border: 1.5px solid rgba(168,85,247,.55);
    box-shadow: 0 0 14px rgba(168,85,247,.25);
    backdrop-filter: blur(8px);
    transition: left .22s cubic-bezier(.34,1.56,.64,1), width .22s cubic-bezier(.34,1.56,.64,1), top .22s, height .22s;
    z-index: 0; pointer-events: none;
}

/* ── Sidebar ── */
.sidebar {
    position: fixed; left: 0; top: 0; height: 100vh;
    width: 0; background: var(--surface); border-right: 1px solid var(--border);
    transition: width .25s cubic-bezier(.4,0,.2,1);
    z-index: 150; overflow: hidden; display: flex;
}
.sidebar.open { width: var(--sb-open); }

.sb-panel { width: var(--sb-open); display: flex; flex-direction: column; flex-shrink: 0; min-width: 0; }
.sb-panel-header {
    height: var(--nav-h); display: flex; align-items: center;
    padding: 0 1rem; border-bottom: 1px solid var(--border);
    font-weight: 600; flex-shrink: 0; gap: .5rem;
}
.sb-panel-header span { flex: 1; }
.sb-panel-close {
    width: 28px; height: 28px; display: flex; align-items: center; justify-content: center;
    border: none; background: transparent; color: var(--text-muted); cursor: pointer;
    border-radius: var(--radius-sm); transition: color .15s, background .15s;
}
.sb-panel-close:hover { color: var(--text); background: var(--surface2); }
.sb-panel-body { overflow-y: auto; overflow-x: hidden; flex: 1; }
#sbPanelContent .page,
#sbPanelContent .page-wide { padding: 1rem; max-width: none; }
#sbPanelContent .lobby-grid { grid-template-columns: 1fr !important; }

/* ── Right Sidebar ── */
.sidebar-right {
    position: fixed; right: 0; top: 0; height: 100vh;
    width: 0; background: var(--surface); border-left: 1px solid var(--border);
    transition: width .25s cubic-bezier(.4,0,.2,1);
    z-index: 150; overflow: hidden; display: flex;
}
.sidebar-right.open { width: var(--sb-right-open); }

.sb-right-panel { width: var(--sb-right-open); display: flex; flex-direction: column; flex-shrink: 0; min-width: 0; }
#sbRightPanelContent .page,
#sbRightPanelContent .page-wide { padding: 1rem; max-width: none; }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; gap: .4rem; padding: .5rem 1.1rem; border-radius: var(--radius-sm); font-size: .875rem; font-weight: 600; cursor: pointer; border: 1px solid transparent; text-decoration: none; transition: all .15s; }
.btn-primary { background: var(--teal); color: #0d1117; border-color: var(--teal); }
.btn-primary:hover { background: var(--teal-dim); border-color: var(--teal-dim); }
.btn-ghost { background: transparent; color: var(--text-muted); border-color: var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--text-muted); }
.btn-danger { background: transparent; color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-lg { padding: .75rem 1.75rem; font-size: 1rem; border-radius: var(--radius); }
.btn:disabled { opacity: .4; cursor: not-allowed; }

/* ── Cards ── */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.card-glow { box-shadow: 0 0 0 1px var(--teal), 0 0 24px var(--teal-glow); }

/* ── Form ── */
.input { width: 100%; padding: .6rem .85rem; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: .9rem; outline: none; transition: border-color .15s; }
.input:focus { border-color: var(--teal); box-shadow: 0 0 0 3px var(--teal-glow); }
.input::placeholder { color: var(--text-muted); }
label { display: block; font-size: .8rem; color: var(--text-muted); margin-bottom: .3rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }

/* ── Badges ── */
.badge { display: inline-flex; align-items: center; gap: .3rem; padding: .2rem .6rem; border-radius: 99px; font-size: .75rem; font-weight: 600; }
.badge-teal  { background: var(--teal-glow); color: var(--teal); border: 1px solid var(--teal); }
.badge-green { background: rgba(63,185,80,.1); color: var(--success); }
.badge-warn  { background: rgba(210,153,34,.1); color: var(--warn); }
.badge-muted { background: var(--surface2); color: var(--text-muted); }

/* ── Pulse ── */
.pulse { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--success); animation: pulse 1.8s ease-in-out infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(63,185,80,.6); } 50% { box-shadow: 0 0 0 5px rgba(63,185,80,0); } }

/* ── Alerts ── */
.alert { padding: .75rem 1rem; border-radius: var(--radius-sm); font-size: .875rem; border: 1px solid; }
.alert-warn   { background: rgba(210,153,34,.1); border-color: var(--warn);   color: var(--warn);   }
.alert-info   { background: var(--teal-glow);    border-color: var(--teal);   color: var(--teal);   }
.alert-danger { background: rgba(248,81,73,.1);  border-color: var(--danger); color: var(--danger); }

/* ── Utility ── */
.text-muted { color: var(--text-muted); } .text-teal { color: var(--teal); }
.text-sm { font-size: .875rem; } .text-xs { font-size: .75rem; } .fw-600 { font-weight: 600; }
.mt-1 { margin-top: .5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; } .mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: .5rem; } .mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: .5rem; } .gap-2 { gap: 1rem; }
.flex { display: flex; } .flex-col { flex-direction: column; }
.items-center { align-items: center; } .justify-between { justify-content: space-between; }
.w-full { width: 100%; }
.divider { border: none; border-top: 1px solid var(--border); margin: 1.25rem 0; }
.page { max-width: 680px; margin: 0 auto; padding: 2rem 1.25rem; }
.page-wide { max-width: 960px; margin: 0 auto; padding: 2rem 1.25rem; }
.messages { list-style: none; margin-bottom: 1rem; }
.messages li { padding: .6rem 1rem; border-radius: var(--radius-sm); margin-bottom: .4rem; font-size: .875rem; }
.messages .success { background: rgba(63,185,80,.1);  color: var(--success); }
.messages .error   { background: rgba(248,81,73,.1);  color: var(--danger);  }
.messages .warning { background: rgba(210,153,34,.1); color: var(--warn);    }
.messages .info    { background: var(--teal-glow);    color: var(--teal);    }