/* CSS Variables */
:root{
  --bg:#0f172a;           /* slate-900 */
  --bg-soft:#111827;      /* gray-900 */
  --panel:#0b1222;        /* custom deep */
  --panel-2:#0e1528;
  --text:#e5e7eb;         /* gray-200 */
  --muted:#9ca3af;        /* gray-400 */
  --primary:#2563eb;      /* blue-600 */
  --primary-600:#1d4ed8;  /* blue-700 */
  --success:#10b981;      /* emerald-500 */
  --danger:#ef4444;       /* red-500 */
  --card-border:rgba(255,255,255,.08);
  --shadow:0 10px 25px rgba(0,0,0,.25);
  --ring: 0 0 0 3px rgba(37,99,235,.35);
}

/* Base */
*{box-sizing:border-box}
html,body{height:100%}
body{font-family:Inter,system-ui,Segoe UI,Arial,Helvetica,sans-serif;background:linear-gradient(180deg, var(--bg), var(--bg-soft));margin:0;color:var(--text)}
a{color:var(--text)}
*:focus{outline:none}
*:focus-visible{box-shadow:var(--ring)}

/* Topbar */
.topbar{position:sticky;top:0;z-index:100;background:linear-gradient(180deg, rgba(17,24,39,.92), rgba(17,24,39,.8));backdrop-filter:blur(10px);border-bottom:1px solid var(--card-border);box-shadow:0 2px 12px rgba(0,0,0,.25)}
.topbar-inner{max-width:1000px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 18px}
.brand{font-weight:800;letter-spacing:.4px;font-size:18px}
.nav{display:flex;gap:10px;align-items:center}
.nav a{color:var(--text);text-decoration:none;padding:8px 12px;border-radius:10px;font-weight:500;transition:background .15s ease, transform .15s ease}
.nav a:hover{background:rgba(255,255,255,.07);transform:translateY(-1px)}
.nav a:focus-visible{box-shadow:var(--ring)}
.bell{position:relative;font-size:20px;cursor:pointer;user-select:none}
#notifCount{display:none;position:absolute;top:-6px;right:-10px;background:var(--danger);color:#fff;border-radius:999px;padding:2px 6px;font-size:12px;line-height:1}

/* Layout */
.container{max-width:1000px;margin:24px auto;padding:18px;background:linear-gradient(180deg, var(--panel), var(--panel-2));border:1px solid var(--card-border);border-radius:14px;box-shadow:var(--shadow)}
.section-title{margin:6px 0 14px 0;font-size:22px}

/* Forms */
label{display:block;margin-top:12px;font-size:13px;color:var(--muted)}
input[type=text],input[type=email],input[type=password]{width:100%;padding:12px 12px;margin:6px 0;border:1px solid var(--card-border);border-radius:10px;background:#0b1020;color:var(--text)}
input[type=file]{margin:6px 0;color:var(--muted)}
button,.btn{background:var(--primary);color:#fff;border:none;padding:10px 14px;border-radius:10px;cursor:pointer;text-decoration:none;display:inline-block;transition:background .15s ease, transform .05s ease, box-shadow .15s ease;font-weight:600;box-shadow:0 1px 2px rgba(0,0,0,.25)}
button:hover,.btn:hover{background:var(--primary-600);transform:translateY(-1px)}
button:active,.btn:active{transform:translateY(0)}
button:disabled,.btn:disabled{opacity:.6;cursor:not-allowed;transform:none}
.btn.secondary{background:transparent;border:1px solid var(--card-border)}
.btn.secondary:hover{background:rgba(255,255,255,.04)}
.btn.outline{background:transparent;border:1px solid rgba(255,255,255,.25);color:var(--text)}
.btn.outline:hover{background:rgba(255,255,255,.05)}
.btn.success{background:var(--success)}
.btn.success:hover{filter:brightness(.95)}
.btn.danger{background:var(--danger)}
.btn.danger:hover{filter:brightness(.95)}
.btn.small{padding:6px 10px;border-radius:8px;font-size:13px}
.btn.large{padding:12px 18px;border-radius:12px;font-size:15px}
.btn.block{display:block;width:100%}
.btn.icon{display:inline-flex;align-items:center;gap:8px}
.filters{display:flex;gap:10px;margin:10px 0;flex-wrap:wrap}

/* Alerts */
.alert{padding:10px 12px;border-radius:10px;margin:10px 0;background:rgba(59,130,246,.15);color:#bcd}
.alert.error{background:rgba(239,68,68,.15);color:#fca5a5}

/* Cards and grid */
.list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.card{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--card-border);border-radius:12px;background:rgba(255,255,255,.02)}
.card .actions{margin-left:auto;display:flex;gap:8px;align-items:center}
.badge{background:rgba(255,255,255,.08);color:var(--text);padding:4px 8px;border-radius:999px;border:1px solid var(--card-border)}

/* Avatars */
.avatar{width:96px;height:96px;border-radius:50%;object-fit:cover;background:#111827;display:block;border:1px solid var(--card-border)}
.placeholder,.placeholder-sm{background:#111827;color:#9aa3b2;display:flex;align-items:center;justify-content:center;border-radius:50%;border:1px solid var(--card-border)}
.placeholder{width:96px;height:96px}
.avatar-sm img{width:42px;height:42px;border-radius:50%;object-fit:cover;border:1px solid var(--card-border)}
.placeholder-sm{width:42px;height:42px;border-radius:50%}

/* Chat */
.chat-wrap{display:flex;flex-direction:column;gap:10px}
.chat-box{height:460px;overflow:auto;border:1px solid var(--card-border);padding:12px;border-radius:12px;background:#0b1020}
.msg{margin:8px 0;max-width:70%;padding:10px 12px;border-radius:14px;box-shadow:0 2px 6px rgba(0,0,0,.3)}
.msg.me{background:linear-gradient(180deg,#064e3b,#065f46);margin-left:auto}
.msg.them{background:linear-gradient(180deg,#1f2937,#111827);margin-right:auto}
.msg img{max-width:280px;border-radius:8px;display:block;margin-top:6px;border:1px solid var(--card-border)}
.chat-send{position:relative;display:flex;gap:8px;margin-top:6px;align-items:flex-end}
.chat-send textarea{
  flex:1;min-height:46px;max-height:160px;resize:vertical;
  width:100%;padding:10px 12px;border:1px solid var(--card-border);
  border-radius:10px;background:#0b1020;color:var(--text);
}
.btn.small{padding:8px 10px;border-radius:8px;font-size:13px}
.btn.icon{display:inline-flex;align-items:center;justify-content:center;min-width:40px}
.btn.icon svg{width:18px;height:18px;display:block}
#sendBtn .icon-plane{transform:rotate(-35deg);transform-origin:50% 50%;}

/* Emoji picker */
.chat-send{position:relative}
.emoji-panel{position:absolute;bottom:48px;left:0;background:#0b1020;border:1px solid var(--card-border);border-radius:10px;padding:8px;box-shadow:0 8px 20px rgba(0,0,0,.35);display:none;max-width:260px;flex-wrap:wrap;gap:6px;z-index:1000}
.emoji-panel.open{display:flex}
.emoji-item{font-size:20px;line-height:1.2;padding:6px;border-radius:8px;cursor:pointer;user-select:none}
.emoji-item:hover{background:rgba(255,255,255,.06)}

/* Attachment menu */
.attach-menu{position:absolute;bottom:48px;left:0;background:#0b1020;border:1px solid var(--card-border);border-radius:10px;box-shadow:0 8px 20px rgba(0,0,0,.35);display:none;z-index:1000;padding:6px}
.attach-menu.open{display:block}
.attach-item{display:block;width:100%;text-align:left;background:transparent;border:0;color:var(--text);padding:8px 10px;border-radius:8px;cursor:pointer}
.attach-item:hover{background:rgba(255,255,255,.06)}

/* Toast notifications */
.toast-box{position:fixed;right:16px;bottom:16px;z-index:9999}
.toast{background:#111;color:#fff;padding:10px 14px;border-radius:8px;margin-top:8px;opacity:0;transform:translateY(8px);transition:all .3s ease;max-width:320px;box-shadow:0 4px 12px rgba(0,0,0,.2)}
.toast.show{opacity:1;transform:translateY(0)}

/* Utility */
.muted{color:var(--muted)}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px;margin-top:8px}
.gallery img{width:100%;height:120px;object-fit:cover;border-radius:10px;border:1px solid var(--card-border)}

@media (max-width:640px){
  .container{margin:12px;border-radius:12px;padding:14px}
  .chat-box{height:60vh}
  .btn.small{min-width:38px}
}