/* ─── Reset ────────────────────────────────────── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#111b21;--bg2:#202c33;--bg3:#0b141a;--bg4:#2a3942;
  --bub-out:#005c4b;--bub-in:#202c33;
  --green:#00a884;--green-dk:#008069;--green-lt:#25d366;
  --txt:#e9edef;--muted:#8696a0;--dim:#667781;
  --border:#2a3942;--link:#53bdeb;--red:#ef5350;--yellow:#ffd279;
}
html,body{height:100%;overflow:hidden;font-family:'Segoe UI',Helvetica,Arial,sans-serif;background:var(--bg);color:var(--txt);-webkit-font-smoothing:antialiased}
input,button,textarea{font-family:inherit}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}

/* ─── Animations ──────────────────────────────── */
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@keyframes typingDot{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.15)}}
@keyframes recording{0%,100%{opacity:1}50%{opacity:.4}}
@keyframes callPulse{0%{box-shadow:0 0 0 0 rgba(0,168,132,.5)}70%{box-shadow:0 0 0 30px rgba(0,168,132,0)}100%{box-shadow:0 0 0 0 rgba(0,168,132,0)}}
@keyframes spin{to{transform:rotate(360deg)}}

/* ─── Login ───────────────────────────────────── */
.login-screen{width:100%;height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;overflow:hidden}
.login-topbar{position:absolute;top:0;left:0;right:0;height:222px;background:var(--green)}
.login-card{background:var(--bg2);border-radius:4px;padding:48px;width:460px;max-width:92vw;position:relative;z-index:2;box-shadow:0 4px 30px rgba(0,0,0,.4)}
.login-logo{font-size:72px;text-align:center;margin-bottom:12px}
.login-title{font-size:22px;font-weight:300;text-align:center;margin-bottom:4px}
.login-brand{font-size:28px;font-weight:600;color:var(--green);text-align:center;margin-bottom:20px}
.login-sub{font-size:14px;color:var(--muted);text-align:center;line-height:1.6;margin-bottom:32px}
.login-input{width:100%;padding:14px 16px;background:var(--bg4);border:2px solid var(--border);border-radius:8px;color:var(--txt);font-size:17px;outline:none;transition:border-color .2s}
.login-input:focus{border-color:var(--green)}
.login-input::placeholder{color:var(--dim)}
.login-btn{width:100%;padding:14px;background:var(--green);border:none;border-radius:8px;color:#fff;font-size:16px;font-weight:600;cursor:pointer;transition:background .2s;margin-top:20px}
.login-btn:hover{background:var(--green-dk)}
.login-btn:active{transform:scale(.98)}
.login-link{font-size:13px;color:var(--green);text-align:center;margin-top:16px;cursor:pointer}
.login-err{color:var(--red);font-size:13px;margin-top:8px;text-align:center;animation:fadeIn .2s ease}
.code-inputs{display:flex;gap:10px;justify-content:center;margin-bottom:20px}
.code-digit{width:48px;height:58px;text-align:center;font-size:26px;font-weight:700;background:var(--bg4);border:2px solid var(--border);border-radius:8px;color:var(--txt);outline:none;caret-color:var(--green);transition:border-color .2s}
.code-digit:focus,.code-digit.filled{border-color:var(--green)}
.login-avatar{width:100px;height:100px;border-radius:50%;background:var(--bg4);display:flex;align-items:center;justify-content:center;font-size:48px;margin:0 auto 20px;border:3px solid var(--green)}
.login-steps{display:flex;justify-content:center;gap:8px;margin-top:28px}
.step-dot{width:8px;height:8px;border-radius:50%;background:var(--border);transition:all .3s}
.step-dot.active{width:24px;border-radius:4px;background:var(--green)}
.step-dot.done{background:var(--green-lt)}
.encrypt-badge{position:relative;z-index:2;margin-top:24px;display:flex;align-items:center;gap:6px;color:var(--muted);font-size:12px}

/* ─── App Layout ──────────────────────────────── */
.app-layout{width:100%;height:100vh;display:flex;overflow:hidden}

/* ─── Sidebar ─────────────────────────────────── */
.sidebar{width:420px;min-width:420px;height:100%;background:var(--bg);display:flex;flex-direction:column;border-right:1px solid var(--border)}
.sb-header{padding:10px 16px;background:var(--bg2);display:flex;align-items:center;justify-content:space-between;height:60px;flex-shrink:0}
.sb-header-left{display:flex;align-items:center;gap:12px}
.sb-header-right{display:flex;gap:8px;align-items:center}
.icon-btn{width:40px;height:40px;border-radius:50%;background:none;border:none;color:var(--muted);font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,color .15s}
.icon-btn:hover{background:rgba(255,255,255,.05);color:var(--txt)}
.avatar-sm{width:40px;height:40px;border-radius:50%;background:var(--bg4);display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer}
.search-bar{padding:8px 12px;background:var(--bg);flex-shrink:0}
.search-inner{display:flex;align-items:center;gap:10px;padding:6px 12px;background:var(--bg2);border-radius:8px}
.search-input{flex:1;border:none;background:transparent;color:var(--txt);font-size:14px;outline:none;padding:6px 0}
.search-input::placeholder{color:var(--dim)}
.tabs{display:flex;border-bottom:1px solid var(--border);flex-shrink:0}
.tab{flex:1;padding:14px 0;text-align:center;font-size:13px;font-weight:500;color:var(--muted);cursor:pointer;border-bottom:3px solid transparent;transition:all .2s}
.tab:hover{color:var(--txt)}
.tab.active{color:var(--green);border-bottom-color:var(--green)}
.contact-list{flex:1;overflow-y:auto}
.contact-item{display:flex;align-items:center;gap:14px;padding:12px 16px;cursor:pointer;border-bottom:1px solid rgba(134,150,160,.08);transition:background .15s}
.contact-item:hover{background:var(--bg4)}
.contact-item.active{background:var(--bg4)}
.c-avatar{position:relative;flex-shrink:0}
.c-avatar-inner{width:50px;height:50px;border-radius:50%;background:var(--bg2);display:flex;align-items:center;justify-content:center;font-size:24px}
.online-dot{position:absolute;bottom:1px;right:1px;width:12px;height:12px;border-radius:50%;background:var(--green);border:2px solid var(--bg)}
.c-info{flex:1;min-width:0}
.c-top{display:flex;justify-content:space-between;margin-bottom:3px}
.c-name{font-weight:500;font-size:16px}
.c-time{font-size:12px;color:var(--dim);flex-shrink:0}
.c-time.typing{color:var(--green)}
.c-last{font-size:14px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:4px}
.c-last.typing{color:var(--green)}
.unread{background:var(--green);color:#fff;font-size:11px;font-weight:600;min-width:20px;height:20px;border-radius:10px;display:flex;align-items:center;justify-content:center;padding:0 6px;flex-shrink:0}
.empty-tab{padding:50px 20px;text-align:center;color:var(--muted)}
.empty-tab-icon{font-size:52px;margin-bottom:14px}

/* ─── Chat Area ───────────────────────────────── */
.chat-area{flex:1;display:flex;flex-direction:column;height:100%;position:relative;background:var(--bg)}
.chat-header{padding:10px 16px;background:var(--bg2);display:flex;align-items:center;gap:12px;height:60px;flex-shrink:0;z-index:5}
.ch-info{flex:1}.ch-name{font-weight:500;font-size:16px}.ch-status{font-size:12px;color:var(--muted)}
.ch-status .online{color:var(--green)}
.ch-right{display:flex;gap:8px}
.back-btn{display:none;background:none;border:none;color:var(--muted);font-size:22px;cursor:pointer;padding:4px 8px 4px 0}
.msg-area{flex:1;overflow-y:auto;position:relative}
.wallpaper{position:absolute;inset:0;z-index:0;background-color:var(--bg3);background-image:url("data:image/svg+xml,%3Csvg width='200' height='200' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='p' width='40' height='40' patternUnits='userSpaceOnUse'%3E%3Ccircle cx='6' cy='6' r='1.2' fill='%23ffffff' opacity='0.03'/%3E%3Ccircle cx='26' cy='22' r='0.8' fill='%23ffffff' opacity='0.025'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='200' height='200' fill='url(%23p)'/%3E%3C/svg%3E")}
.msg-inner{position:relative;z-index:1;padding:8px 60px;display:flex;flex-direction:column;gap:2px;min-height:100%}
.chat-encrypt{align-self:center;background:rgba(32,44,51,.9);padding:6px 14px;border-radius:8px;font-size:12px;color:var(--yellow);margin:12px 0 8px;text-align:center;max-width:400px;line-height:1.5;display:flex;align-items:center;gap:6px}
.date-sep{align-self:center;background:rgba(32,44,51,.9);padding:5px 12px;border-radius:8px;font-size:12px;color:var(--muted);margin:8px auto;text-align:center;width:fit-content}
.msg-row{display:flex;animation:fadeIn .2s ease}
.msg-row.mine{justify-content:flex-end}
.msg-row.theirs{justify-content:flex-start}
.msg-row.gap{margin-top:8px}
.bubble{max-width:65%;padding:6px 8px 6px 10px;position:relative;min-width:80px;word-break:break-word}
.bubble.out{background:var(--bub-out);border-radius:8px 0 8px 8px}
.bubble.in{background:var(--bub-in);border-radius:0 8px 8px 8px}
.msg-sender{font-size:13px;font-weight:600;margin-bottom:2px}
.msg-text{font-size:14.5px;line-height:1.4}
.msg-meta{float:right;margin-left:8px;margin-top:4px;display:inline-flex;align-items:center;gap:3px;font-size:11px}
.msg-meta.out{color:rgba(255,255,255,.5)}.msg-meta.in{color:var(--dim)}

/* ─── Voice message ───────────────────────────── */
.voice-msg{display:flex;align-items:center;gap:10px;min-width:220px;padding:4px 0}
.voice-play{width:34px;height:34px;border-radius:50%;background:var(--green);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff;transition:background .15s}
.voice-play:hover{background:var(--green-dk)}
.voice-wave{flex:1;height:30px;display:flex;align-items:center;gap:2px}
.voice-bar{width:3px;border-radius:2px;background:rgba(255,255,255,.4);transition:height .1s}
.voice-dur{font-size:12px;color:rgba(255,255,255,.6);flex-shrink:0;min-width:32px}

/* ─── Image message ───────────────────────────── */
.msg-image{max-width:330px;border-radius:8px;overflow:hidden;cursor:pointer;margin:-2px -4px 2px -6px}
.msg-image img{width:100%;display:block;border-radius:6px}

/* ─── Recording bar ───────────────────────────── */
.recording-bar{padding:8px 16px;display:flex;gap:12px;align-items:center;background:var(--bg3);flex-shrink:0}
.rec-dot{width:12px;height:12px;border-radius:50%;background:var(--red);animation:recording 1s infinite}
.rec-time{font-size:15px;color:var(--txt);font-variant-numeric:tabular-nums;min-width:48px}
.rec-wave{flex:1;height:32px;display:flex;align-items:center;gap:2px;overflow:hidden}
.rec-wave-bar{width:3px;border-radius:2px;background:var(--green);transition:height .05s}
.rec-cancel{background:none;border:none;color:var(--red);font-size:14px;cursor:pointer;padding:8px;font-weight:500}
.rec-send{width:44px;height:44px;border-radius:50%;background:var(--green);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}
.rec-send:hover{background:var(--green-dk)}

/* ─── Typing ──────────────────────────────────── */
.typing-ind{display:flex;animation:slideUp .2s ease}
.typing-bub{padding:10px 14px;background:var(--bub-in);border-radius:0 8px 8px 8px;display:flex;gap:4px;align-items:center}
.t-dot{width:7px;height:7px;border-radius:50%;background:var(--muted)}
.t-dot:nth-child(1){animation:typingDot 1.2s 0s infinite}
.t-dot:nth-child(2){animation:typingDot 1.2s .2s infinite}
.t-dot:nth-child(3){animation:typingDot 1.2s .4s infinite}

/* ─── Panels ──────────────────────────────────── */
.emoji-panel{padding:12px 16px;background:var(--bg2);border-top:1px solid var(--border);display:flex;flex-wrap:wrap;gap:2px;animation:slideUp .2s ease;max-height:180px;overflow-y:auto}
.emoji-btn{font-size:26px;cursor:pointer;padding:6px;border-radius:8px;background:none;border:none;transition:background .15s;line-height:1}
.emoji-btn:hover{background:var(--bg4)}
.attach-panel{padding:20px 24px;background:var(--bg2);border-top:1px solid var(--border);display:flex;gap:20px;justify-content:center;animation:slideUp .2s ease}
.attach-opt{text-align:center;cursor:pointer}
.attach-icon{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:6px;transition:transform .15s}
.attach-opt:hover .attach-icon{transform:scale(1.1)}
.attach-label{font-size:12px;color:var(--muted)}

/* ─── Input bar ───────────────────────────────── */
.input-bar{padding:8px 10px;display:flex;gap:8px;align-items:flex-end;background:var(--bg3);flex-shrink:0}
.in-icon{font-size:22px;cursor:pointer;padding:8px;color:var(--muted);transition:color .2s;background:none;border:none;line-height:1}
.in-icon:hover,.in-icon.active{color:var(--green)}
.in-icon.clip{transform:rotate(45deg)}
.msg-input{flex:1;padding:10px 14px;background:var(--bg4);border:none;border-radius:8px;color:var(--txt);font-size:15px;outline:none;resize:none;max-height:120px;min-height:42px;line-height:1.4}
.msg-input::placeholder{color:var(--dim)}
.send-btn{width:44px;height:44px;border-radius:50%;background:var(--green);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s,transform .1s}
.send-btn:hover{background:var(--green-dk)}
.send-btn:active{transform:scale(.93)}
.send-btn.recording{background:var(--red);animation:pulse 1.5s infinite}

/* ─── Empty state ─────────────────────────────── */
.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px}
.empty-logo{width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,var(--bg2),transparent);display:flex;align-items:center;justify-content:center;font-size:100px;opacity:.8}
.empty-title{font-weight:300;font-size:32px}
.empty-sub{color:var(--muted);font-size:14px;max-width:400px;text-align:center;line-height:1.6}

/* ─── Image Viewer ────────────────────────────── */
.image-viewer{position:fixed;inset:0;z-index:1000;background:rgba(0,0,0,.92);display:flex;flex-direction:column}
.image-viewer.hidden{display:none}
.iv-header{padding:12px 20px;display:flex;justify-content:space-between;align-items:center}
.iv-title{color:var(--txt);font-size:15px}
.iv-close{background:none;border:none;color:var(--txt);font-size:24px;cursor:pointer;padding:8px;border-radius:50%;transition:background .15s}
.iv-close:hover{background:rgba(255,255,255,.1)}
.iv-body{flex:1;display:flex;align-items:center;justify-content:center;padding:20px}
.iv-body img{max-width:90%;max-height:85vh;object-fit:contain;border-radius:4px}

/* ─── Call Overlay ────────────────────────────── */
.call-overlay{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center}
.call-overlay.hidden{display:none}
.call-bg{position:absolute;inset:0;background:linear-gradient(180deg,#1a3a2a 0%,#0a1a12 100%);opacity:.97}
.call-content{position:relative;z-index:1;text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px}
.call-avatar{width:120px;height:120px;border-radius:50%;background:var(--bg4);display:flex;align-items:center;justify-content:center;font-size:56px;animation:callPulse 2s infinite}
.call-name{font-size:26px;font-weight:500;color:var(--txt)}
.call-status{font-size:15px;color:var(--muted)}
.call-timer{font-size:18px;color:var(--green);font-variant-numeric:tabular-nums}
.call-actions{display:flex;gap:32px;margin-top:40px}
.call-action-btn{width:60px;height:60px;border-radius:50%;background:rgba(255,255,255,.1);border:none;color:var(--txt);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}
.call-action-btn:hover{background:rgba(255,255,255,.2)}
.call-action-btn.call-end{background:var(--red);color:#fff}
.call-action-btn.call-end:hover{background:#d32f2f}
.call-action-btn.muted-on{background:rgba(255,255,255,.25)}

/* ─── Dropdown ────────────────────────────────── */
.dropdown{position:absolute;top:100%;right:0;background:var(--bg2);border-radius:4px;padding:8px 0;min-width:200px;box-shadow:0 4px 20px rgba(0,0,0,.4);z-index:100;animation:slideUp .15s ease}
.dropdown-item{padding:10px 24px;font-size:14px;cursor:pointer;transition:background .1s}
.dropdown-item:hover{background:var(--bg4)}

/* ─── Responsive ──────────────────────────────── */
@media(max-width:900px){.sidebar{width:100%;min-width:unset}.msg-inner{padding:8px 16px}.bubble{max-width:85%}}
@media(max-width:768px){
  .sidebar{position:absolute;z-index:30;width:100vw;min-width:unset}
  .sidebar.hidden-m{display:none}
  .back-btn{display:flex}
  .msg-inner{padding:8px 12px}
  .login-card{padding:32px 24px}
  .code-digit{width:42px;height:50px;font-size:22px}
}