:root{
  --yellow:#FFFC00;
  --ink:#0b0b0f;
  --white:#ffffff;
  --grey:#8a8a8f;
  --line:#e7e7ea;
  --bg:#ffffff;
  --blue:#0fadff;
  --red:#f23c57;
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bot:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:#000;color:var(--ink);overscroll-behavior:none}
body{position:fixed;inset:0;overflow:hidden}
button,input{font-family:inherit}
.hidden{display:none!important}

/* Phone frame on large screens */
.screen{position:absolute;inset:0;background:var(--bg);max-width:480px;margin:0 auto;overflow:hidden}
@media(min-width:520px){
  body{background:#111}
  .screen{top:0;bottom:0;border-radius:0;box-shadow:0 0 60px rgba(0,0,0,.5)}
}

/* ---------------- AUTH ---------------- */
.auth{display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:var(--yellow);padding:24px;text-align:center}
.auth .ghost{font-size:80px;filter:drop-shadow(0 6px 10px rgba(0,0,0,.15));animation:float 3s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.logo{font-size:44px;font-weight:900;margin:6px 0 0;letter-spacing:-1px}
.tagline{margin:2px 0 26px;font-weight:600;opacity:.7}
#auth-form{width:100%;max-width:320px;display:flex;flex-direction:column;gap:12px}
#auth-form input{padding:16px 18px;border:none;border-radius:14px;font-size:16px;background:rgba(255,255,255,.92);outline:none}
#auth-form input:focus{box-shadow:0 0 0 3px rgba(0,0,0,.15)}
#auth-submit{padding:16px;border:none;border-radius:14px;background:var(--ink);color:#fff;font-size:17px;font-weight:800;cursor:pointer;margin-top:4px}
#auth-submit:active{transform:scale(.98)}
.error{color:#b3002d;font-weight:600;min-height:20px;margin:14px 0 0}
.switch{margin-top:8px;font-weight:600}
.switch a{color:var(--ink);font-weight:800;margin-left:6px}

/* ---------------- TABS ---------------- */
.tab{position:absolute;inset:0;bottom:64px;background:var(--bg)}
#tabbar{position:absolute;left:0;right:0;bottom:0;height:calc(64px + var(--safe-bot));
  padding-bottom:var(--safe-bot);display:flex;background:#fff;border-top:1px solid var(--line);z-index:20}
.navbtn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  background:none;border:none;cursor:pointer;position:relative;color:var(--grey);font-weight:600}
.navbtn .ico{font-size:22px;filter:grayscale(1);opacity:.55}
.navbtn.active .ico{filter:none;opacity:1}
.navbtn.active .lbl{color:var(--ink)}
.navbtn .lbl{font-size:11px}
.badge{position:absolute;top:6px;right:calc(50% - 24px);min-width:18px;height:18px;padding:0 5px;
  background:var(--red);color:#fff;border-radius:9px;font-size:11px;font-weight:800;
  display:flex;align-items:center;justify-content:center}

/* ---------------- CAMERA ---------------- */
#tab-camera{background:#000}
#cam{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#000}
#cam.mirror{transform:scaleX(-1)}
.cam-fallback{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;color:#fff;background:#111}
.upload-btn{background:var(--yellow);color:#000;padding:12px 20px;border-radius:20px;font-weight:800;cursor:pointer}
.cam-top{position:absolute;top:0;left:0;right:0;padding:calc(14px + var(--safe-top)) 16px 0;display:flex;align-items:center;z-index:5}
.avatar-btn{width:40px;height:40px;border-radius:50%;border:2px solid rgba(255,255,255,.85);
  background:var(--yellow);cursor:pointer;font-weight:900;color:#000;font-size:16px;display:flex;align-items:center;justify-content:center}
.cam-controls{position:absolute;left:0;right:0;bottom:24px;display:flex;align-items:center;justify-content:center;gap:44px;z-index:5}
.shutter{width:78px;height:78px;border-radius:50%;background:transparent;border:6px solid #fff;cursor:pointer;
  box-shadow:0 0 0 4px rgba(255,255,255,.25);transition:transform .1s}
.shutter:active{transform:scale(.9)}
.cam-side{width:48px;height:48px;border-radius:50%;border:none;background:rgba(0,0,0,.35);color:#fff;
  font-size:22px;cursor:pointer;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(6px)}
.upload-icon{overflow:hidden}

/* ---------------- LISTS ---------------- */
.list-tab{background:var(--bg);overflow-y:auto;-webkit-overflow-scrolling:touch}
.list-header{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
  padding:calc(14px + var(--safe-top)) 18px 12px;z-index:5;border-bottom:1px solid var(--line)}
.list-header h2{margin:0;font-size:24px;font-weight:900}
.list{display:flex;flex-direction:column}
.row{display:flex;align-items:center;gap:14px;padding:12px 16px;cursor:pointer;border-bottom:1px solid var(--line)}
.row:active{background:#f5f5f7}
.av{width:48px;height:48px;border-radius:50%;flex:0 0 48px;display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:19px}
.row-main{flex:1;min-width:0}
.row-name{font-weight:700;font-size:16px}
.row-sub{font-size:13px;color:var(--grey);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:6px}
.row-sub.unopened{color:var(--red);font-weight:700}
.dot{width:11px;height:11px;border-radius:3px;flex:0 0 11px;display:inline-block}
.dot.snap{background:var(--red)}
.dot.snap.opened{background:transparent;border:2px solid var(--red)}
.dot.text{background:var(--blue)}
.dot.text.opened{background:transparent;border:2px solid var(--blue)}
.row-right{color:var(--grey);font-size:12px}
.empty{padding:60px 30px;text-align:center;color:var(--ink)}
.empty .muted,.muted{color:var(--grey)}

/* Friends add */
.add-friend{display:flex;gap:8px;padding:14px 16px}
.add-friend input{flex:1;padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-size:15px;outline:none}
.add-friend input:focus{border-color:var(--ink)}
#add-btn{padding:0 18px;border:none;border-radius:12px;background:var(--ink);color:#fff;font-weight:800;cursor:pointer}
.add-msg{padding:0 16px;min-height:18px;font-size:13px;font-weight:600}
.add-msg.ok{color:#0a8f3c}.add-msg.err{color:var(--red)}
.section-title{padding:14px 16px 6px;font-size:13px;font-weight:800;color:var(--grey);text-transform:uppercase;letter-spacing:.5px}
.req-actions{display:flex;gap:8px}
.req-actions button{border:none;border-radius:20px;padding:8px 14px;font-weight:800;cursor:pointer;font-size:13px}
.btn-accept{background:var(--ink);color:#fff}
.btn-decline{background:#eee;color:#333}
.pending-tag{font-size:12px;color:var(--grey);font-weight:700}

/* Profile */
.profile-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:34px 20px}
.profile-avatar{width:96px;height:96px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:40px;font-weight:900}
.profile-name{font-size:22px;font-weight:900}
.profile-stat{color:var(--grey);font-weight:600}
.danger-btn{display:block;width:calc(100% - 32px);margin:10px auto;padding:15px;border:none;border-radius:14px;
  background:#f2f2f5;color:var(--red);font-weight:800;font-size:16px;cursor:pointer}
.version{text-align:center;color:var(--grey);font-size:12px;margin-top:20px}

/* ---------------- OVERLAY / PREVIEW ---------------- */
.overlay{position:absolute;inset:0;background:#000;z-index:40;max-width:480px;margin:0 auto}
#preview-img,#viewer-img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#000}
.preview-top{position:absolute;top:0;left:0;right:0;padding:calc(14px + var(--safe-top)) 14px 0;
  display:flex;align-items:center;justify-content:space-between;z-index:3}
.round-btn{width:42px;height:42px;border-radius:50%;border:none;background:rgba(0,0,0,.4);color:#fff;
  font-size:20px;cursor:pointer;backdrop-filter:blur(6px)}
.duration-picker{display:flex;gap:6px;background:rgba(0,0,0,.4);border-radius:22px;padding:4px;backdrop-filter:blur(6px)}
.dur{border:none;background:transparent;color:#fff;padding:8px 14px;border-radius:18px;font-weight:800;cursor:pointer}
.dur.active{background:#fff;color:#000}
.preview-caption{position:absolute;left:0;right:0;bottom:120px;margin:auto;width:100%;
  background:rgba(0,0,0,.5);border:none;color:#fff;text-align:center;padding:14px;font-size:17px;outline:none}
.preview-caption::placeholder{color:rgba(255,255,255,.7)}
.send-fab{position:absolute;right:18px;bottom:calc(28px + var(--safe-bot));background:#fff;color:#000;border:none;
  border-radius:26px;padding:15px 24px;font-weight:900;font-size:16px;cursor:pointer;box-shadow:0 6px 20px rgba(0,0,0,.35);z-index:3}
.send-fab:active{transform:scale(.97)}
.send-fab.wide{position:static;width:100%;justify-content:center;margin-top:14px;box-shadow:none}
.send-fab:disabled{opacity:.5}

/* Send sheet */
.sheet{position:absolute;inset:0;z-index:50;background:rgba(0,0,0,.5);display:flex;align-items:flex-end;max-width:480px;margin:0 auto}
.sheet-inner{background:#fff;width:100%;border-radius:22px 22px 0 0;padding:10px 18px calc(20px + var(--safe-bot));
  max-height:78%;display:flex;flex-direction:column;animation:up .25s ease}
@keyframes up{from{transform:translateY(100%)}to{transform:translateY(0)}}
.sheet-handle{width:40px;height:5px;background:#ddd;border-radius:3px;margin:4px auto 10px}
.sheet-inner h3{margin:0 0 10px}
.send-friends{overflow-y:auto;display:flex;flex-direction:column}
.send-friend{display:flex;align-items:center;gap:12px;padding:10px 4px;cursor:pointer;border-bottom:1px solid var(--line)}
.send-friend .check{margin-left:auto;width:26px;height:26px;border-radius:50%;border:2px solid #ccc;flex:0 0 26px;
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px}
.send-friend.sel .check{background:var(--blue);border-color:var(--blue)}

/* ---------------- SNAP VIEWER ---------------- */
.viewer{background:#000}
.viewer-progress{position:absolute;top:calc(10px + var(--safe-top));left:12px;right:12px;height:4px;
  background:rgba(255,255,255,.3);border-radius:2px;z-index:3;overflow:hidden}
#viewer-bar{height:100%;width:0;background:#fff}
.viewer-caption{position:absolute;left:0;right:0;bottom:14%;text-align:center;color:#fff;
  background:rgba(0,0,0,.4);padding:12px;font-size:18px;font-weight:600}
.viewer-hint{position:absolute;bottom:40px;left:0;right:0;text-align:center;color:rgba(255,255,255,.85);font-weight:600}

/* ---------------- CHAT ---------------- */
.chat{background:#fff;display:flex;flex-direction:column}
.chat-header{display:flex;align-items:center;gap:10px;padding:calc(10px + var(--safe-top)) 12px 10px;
  border-bottom:1px solid var(--line);background:#fff}
.ghost-btn{background:none;font-size:30px;width:34px;color:var(--ink)}
.chat-avatar{width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
.chat-title{font-weight:800;font-size:18px}
.chat-messages{flex:1;overflow-y:auto;padding:14px 12px;display:flex;flex-direction:column;gap:8px;-webkit-overflow-scrolling:touch}
.msg{max-width:76%;padding:10px 14px;border-radius:20px;font-size:15px;line-height:1.35;word-wrap:break-word;position:relative}
.msg.them{align-self:flex-start;background:#ececef;border-bottom-left-radius:6px}
.msg.me{align-self:flex-end;background:var(--blue);color:#fff;border-bottom-right-radius:6px}
.msg .time{display:block;font-size:10px;opacity:.6;margin-top:3px;text-align:right}
.msg.snapmsg{cursor:pointer;font-weight:800;display:flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--red);color:var(--red)}
.msg.snapmsg.me{border-color:rgba(255,255,255,.5);color:#fff;background:var(--blue)}
.msg.snapmsg.opened{opacity:.6;font-weight:600}
.msg-status{align-self:flex-end;font-size:11px;color:var(--grey);margin:-4px 4px 2px}
.chat-typing{padding:0 16px 4px;color:var(--grey);font-size:13px;font-style:italic}
.chat-input{display:flex;align-items:center;gap:8px;padding:8px 10px calc(8px + var(--safe-bot));border-top:1px solid var(--line);background:#fff}
.chat-input input{flex:1;padding:12px 16px;border:1px solid var(--line);border-radius:22px;font-size:15px;outline:none}
.chat-input input:focus{border-color:#bbb}
.chat-cam{background:var(--yellow);border:none;width:44px;height:44px;border-radius:50%;font-size:20px;cursor:pointer;flex:0 0 44px}
.chat-send{background:var(--blue);border:none;color:#fff;width:44px;height:44px;border-radius:50%;font-size:18px;cursor:pointer;flex:0 0 44px}

/* Toast */
.toast{position:absolute;top:calc(16px + var(--safe-top));left:50%;transform:translateX(-50%);
  background:rgba(0,0,0,.85);color:#fff;padding:12px 20px;border-radius:22px;font-weight:700;z-index:100;
  max-width:90%;text-align:center;box-shadow:0 6px 20px rgba(0,0,0,.3)}