:root{ --gold:#d4af37; --gold-bright:#f5d576; }
*{box-sizing:border-box;}
html,body{height:100%;margin:0;font-family:'Segoe UI',system-ui,-apple-system,sans-serif;}
body{background-size:cover;background-position:center;background-attachment:fixed;transition:background-image .4s;}
body[data-theme="white"]{background-image:linear-gradient(rgba(255,255,255,.75),rgba(255,255,255,.75)),url('assets/bg-white.jpg');color:#1a1a1a;}
body[data-theme="black"]{background-image:linear-gradient(rgba(8,8,10,.75),rgba(8,8,10,.75)),url('assets/bg-black.jpg');color:#f2e9d8;}

/* Auth */
.auth-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;}
.auth-card{width:100%;max-width:380px;padding:26px;border-radius:18px;text-align:center;
  border:1px solid rgba(212,175,55,.4);box-shadow:0 10px 40px rgba(0,0,0,.35);backdrop-filter:blur(10px);}
body[data-theme="white"] .auth-card{background:rgba(255,255,255,.88);}
body[data-theme="black"] .auth-card{background:rgba(18,18,22,.88);}
.auth-logo{width:64px;height:64px;border-radius:50%;margin-bottom:8px;}
.auth-card h1{font-size:1.1rem;margin:4px 0 0;letter-spacing:1px;
  background:linear-gradient(90deg,var(--gold-bright),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent;}
.auth-card .sub{font-size:.65rem;opacity:.65;letter-spacing:1px;margin:2px 0 18px;}
.tabs{display:flex;gap:6px;margin-bottom:16px;background:rgba(150,150,150,.15);padding:4px;border-radius:12px;}
.tab{flex:1;padding:8px;border:none;border-radius:9px;background:transparent;color:inherit;opacity:.6;cursor:pointer;font-weight:700;font-size:.8rem;}
.tab.active{opacity:1;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;}
.acct-type{display:flex;gap:8px;margin-bottom:14px;}
.acct-type button{flex:1;padding:8px;border-radius:10px;border:1px solid rgba(212,175,55,.4);background:transparent;color:inherit;opacity:.6;cursor:pointer;font-weight:600;font-size:.8rem;}
.acct-type button.active{opacity:1;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;}
.field{margin-bottom:12px;text-align:left;}
.field label{display:block;font-size:.72rem;opacity:.75;margin-bottom:4px;font-weight:600;}
.field input{width:100%;padding:9px 12px;border-radius:10px;border:1px solid rgba(212,175,55,.35);background:rgba(150,150,150,.12);color:inherit;font-size:.85rem;outline:none;}
.avail{font-size:.7rem;margin-top:4px;height:14px;}
.avail.ok{color:#3ecf6e;} .avail.no{color:#e5534b;}
.primary-btn{width:100%;padding:11px;border:none;border-radius:12px;margin-top:6px;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;font-weight:800;cursor:pointer;}
.error{color:#e5534b;font-size:.75rem;margin-top:8px;min-height:14px;}

/* App shell */
.app-screen{display:flex;flex-direction:column;height:100vh;}
header{display:flex;align-items:center;gap:10px;padding:10px 16px;border-bottom:1px solid rgba(212,175,55,.4);backdrop-filter:blur(6px);}
.hdr-logo{width:34px;height:34px;border-radius:50%;}
header h1{font-size:.9rem;margin:0;background:linear-gradient(90deg,var(--gold-bright),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent;}
header .sub{font-size:.6rem;opacity:.7;}
.theme-toggle{margin-left:auto;display:flex;gap:6px;background:rgba(120,120,120,.2);padding:4px;border-radius:20px;}
.theme-toggle button{border:none;padding:6px 10px;border-radius:16px;font-size:.7rem;cursor:pointer;background:transparent;color:inherit;opacity:.6;font-weight:600;}
.theme-toggle button.active{opacity:1;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;}
.signup-btn{margin-left:8px;border:1px solid var(--gold);background:transparent;color:var(--gold);padding:6px 12px;border-radius:16px;font-size:.7rem;font-weight:700;cursor:pointer;}

main{flex:1;display:flex;overflow:hidden;max-width:1100px;margin:0 auto;width:100%;}
.sidebar{width:260px;flex-shrink:0;overflow-y:auto;border-right:1px solid rgba(212,175,55,.3);backdrop-filter:blur(8px);}
body[data-theme="white"] .sidebar{background:rgba(255,255,255,.85);}
body[data-theme="black"] .sidebar{background:rgba(18,18,22,.85);}
.new-chat{display:flex;gap:4px;padding:10px;border-bottom:1px solid rgba(212,175,55,.2);}
.new-chat input{flex:1;padding:7px 10px;border-radius:8px;border:1px solid rgba(212,175,55,.35);background:rgba(150,150,150,.12);color:inherit;font-size:.78rem;}
.new-chat button{border:none;border-radius:8px;padding:0 12px;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;font-weight:700;cursor:pointer;}
.contact{display:flex;gap:10px;align-items:center;padding:12px 14px;cursor:pointer;border-bottom:1px solid rgba(150,150,150,.15);}
.contact:hover,.contact.active{background:rgba(212,175,55,.12);}
.avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--gold),#8a6d1a);display:flex;align-items:center;justify-content:center;font-weight:700;color:#111;flex-shrink:0;font-size:.8rem;}
.contact .name{font-weight:600;font-size:.85rem;}
.contact .last{font-size:.7rem;opacity:.65;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:170px;}

.chat-area{flex:1;display:flex;flex-direction:column;min-width:0;}
.chat-header{padding:12px 16px;border-bottom:1px solid rgba(212,175,55,.3);font-weight:600;backdrop-filter:blur(6px);font-size:.9rem;}
.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px;}
.bubble{max-width:70%;padding:9px 13px;border-radius:16px;font-size:.85rem;line-height:1.35;box-shadow:0 2px 6px rgba(0,0,0,.15);}
.bubble.out{align-self:flex-end;background:linear-gradient(135deg,var(--gold-bright),var(--gold));color:#1a1a1a;border-bottom-right-radius:4px;}
.bubble.in{align-self:flex-start;border-bottom-left-radius:4px;}
body[data-theme="white"] .bubble.in{background:rgba(255,255,255,.9);color:#1a1a1a;}
body[data-theme="black"] .bubble.in{background:rgba(40,38,32,.9);color:#f2e9d8;}
.bubble img{max-width:180px;border-radius:10px;display:block;margin-top:4px;}
.time{font-size:.58rem;opacity:.55;margin-top:3px;display:block;}

.composer{position:relative;display:flex;align-items:center;gap:8px;padding:10px 14px;border-top:1px solid rgba(212,175,55,.3);backdrop-filter:blur(6px);}
.composer input[type=text]{flex:1;padding:10px 14px;border-radius:20px;border:1px solid rgba(212,175,55,.4);background:rgba(150,150,150,.12);color:inherit;font-size:.85rem;outline:none;}
.icon-btn{background:none;border:none;font-size:1.15rem;cursor:pointer;color:var(--gold);}
.send-btn{background:linear-gradient(135deg,var(--gold-bright),var(--gold));border:none;border-radius:50%;width:36px;height:36px;cursor:pointer;font-size:1rem;flex-shrink:0;}
.emoji-panel{position:absolute;bottom:52px;left:14px;width:250px;max-height:200px;overflow-y:auto;border-radius:12px;padding:8px;display:none;box-shadow:0 6px 20px rgba(0,0,0,.3);border:1px solid rgba(212,175,55,.4);}
body[data-theme="white"] .emoji-panel{background:rgba(255,255,255,.92);}
body[data-theme="black"] .emoji-panel{background:rgba(18,18,22,.92);}
.emoji-panel.show{display:block;}
.emoji-tabs{display:flex;gap:6px;margin-bottom:6px;}
.emoji-tabs button{flex:1;padding:5px;border:none;border-radius:8px;background:rgba(150,150,150,.15);cursor:pointer;font-size:.68rem;font-weight:700;color:inherit;}
.emoji-tabs button.active{background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;}
.emoji-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;}
.emoji-grid span{font-size:1.25rem;text-align:center;cursor:pointer;border-radius:6px;padding:3px;}
.emoji-grid span:hover{background:rgba(212,175,55,.2);}

.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.55);display:none;align-items:center;justify-content:center;z-index:50;padding:16px;}
.modal-backdrop.show{display:flex;}
.modal{position:relative;width:100%;max-width:380px;border-radius:16px;padding:22px;border:1px solid rgba(212,175,55,.4);box-shadow:0 10px 40px rgba(0,0,0,.4);max-height:90vh;overflow-y:auto;}
body[data-theme="white"] .modal{background:#fbf9f2;color:#1a1a1a;}
body[data-theme="black"] .modal{background:#101014;color:#f2e9d8;}
.modal h2{margin:0 0 14px;font-size:1.1rem;background:linear-gradient(90deg,var(--gold-bright),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent;}
.acct-type{display:flex;gap:8px;margin-bottom:14px;}
.acct-type button{flex:1;padding:8px;border-radius:10px;border:1px solid rgba(212,175,55,.4);background:transparent;color:inherit;opacity:.6;cursor:pointer;font-weight:600;font-size:.8rem;}
.acct-type button.active{opacity:1;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;}
.create-btn{width:100%;padding:11px;border:none;border-radius:12px;margin-top:6px;background:linear-gradient(90deg,var(--gold),var(--gold-bright));color:#1a1a1a;font-weight:800;cursor:pointer;}
.close-x{float:right;background:none;border:none;font-size:1.1rem;cursor:pointer;color:inherit;opacity:.6;}

.status-strip{display:flex;gap:10px;padding:12px;overflow-x:auto;border-bottom:1px solid rgba(212,175,55,.2);}
.status-item{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:.62rem;cursor:pointer;flex-shrink:0;width:56px;text-align:center;}
.status-ring{width:48px;height:48px;border-radius:50%;padding:2px;border:2px solid rgba(150,150,150,.4);display:flex;align-items:center;justify-content:center;}
.status-ring.has-status{border-color:var(--gold);}
.status-ring img{width:100%;height:100%;border-radius:50%;object-fit:cover;}
.status-ring.me{border-style:dashed;}

.menu-btn{display:none;background:none;border:none;font-size:1.3rem;color:var(--gold);cursor:pointer;padding:4px 8px;}
.sidebar-backdrop{display:none;}

@media (max-width:640px){
  .menu-btn{display:block;}

  .sidebar-backdrop{
    display:block;position:fixed;inset:0;top:56px;background:rgba(0,0,0,.5);
    z-index:9;opacity:0;pointer-events:none;transition:opacity .2s;
  }
  .sidebar-backdrop.show{opacity:1;pointer-events:auto;}

  .sidebar{
    position:fixed;top:56px;bottom:0;left:0;width:82%;max-width:320px;
    z-index:10;transform:translateX(-100%);transition:transform .25s ease;
    box-shadow:4px 0 20px rgba(0,0,0,.4);
    backdrop-filter:none; /* solid — no see-through to the chat behind it */
  }
  body[data-theme="white"] .sidebar{background:#fbf9f2;}
  body[data-theme="black"] .sidebar{background:#101014;}
  .sidebar.open{transform:translateX(0);}

  .chat-area{margin-left:0;}
}