:root{
  --teal-900:#0a7d82;
  --teal-700:#0eb3ae;
  --teal-500:#2fd6cf;
  --teal-300:#7fe9e2;
  --teal-100:#d7f9f5;
  --bg:#eafcfa;
  --card:#ffffff;
  --ink:#12303a;
  --ink-soft:#5c7c85;
  --line:#dff4f1;
  --pink:#ff5a7a;
  --gold:#f5b942;
  --radius-lg:26px;
  --radius-md:18px;
  --radius-sm:12px;
  --shadow:0 10px 30px -12px rgba(10,90,90,.25);
  --shadow-lift:0 16px 36px -14px rgba(10,90,90,.35);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:'Vazirmatn',Tahoma,sans-serif;
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(47,214,207,.10), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(255,90,122,.06), transparent 55%),
    var(--bg);
  color:var(--ink);
  min-height:100vh;
  overflow-x:hidden;
}
button,input,textarea{font-family:inherit;}
button{cursor:pointer;border:none;background:none;color:inherit;}
a{color:inherit;text-decoration:none;}
::-webkit-scrollbar{width:8px;height:8px;}
::-webkit-scrollbar-thumb{background:var(--teal-300);border-radius:10px;}

@keyframes fadeIn{from{opacity:0;transform:translateY(6px);}to{opacity:1;transform:translateY(0);}}
#view-body{animation:fadeIn .28s ease;}

.app-shell{max-width:1100px;margin:0 auto;padding:18px 84px 40px 18px;min-height:100vh;position:relative;}
@media(max-width:760px){.app-shell{padding:14px 68px 90px 14px;}}

/* ---------- Nav ---------- */
.side-nav{position:fixed;top:50%;right:16px;transform:translateY(-50%);background:var(--card);border-radius:32px;box-shadow:var(--shadow-lift);padding:14px 10px;display:flex;flex-direction:column;gap:10px;z-index:50;}
@media(max-width:760px){.side-nav{right:10px;padding:10px 7px;gap:6px;}}
.nav-btn{width:42px;height:42px;display:flex;align-items:center;justify-content:center;border-radius:14px;color:var(--teal-900);transition:background .15s, transform .15s;}
.nav-btn svg{width:21px;height:21px;}
.nav-btn:hover{background:var(--teal-100);transform:translateY(-1px);}
.nav-btn.active{background:var(--teal-100);color:var(--teal-700);box-shadow:inset 0 0 0 1.5px var(--teal-300);}
.nav-btn.add{background:linear-gradient(135deg,var(--teal-500),var(--teal-900));color:#fff;box-shadow:0 6px 16px -4px rgba(14,179,174,.55);}
.nav-btn.add:hover{transform:scale(1.08);}

/* ---------- Topbar ---------- */
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:20px;color:var(--teal-900);letter-spacing:.2px;}
.logo .mark{width:32px;height:32px;object-fit:contain;flex-shrink:0;}
.logo-sub{font-size:10px;letter-spacing:3px;color:var(--teal-500);font-weight:700;margin-inline-start:2px;}
.topbar-user{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-soft);}
.btn-ghost-sm{font-size:12px;color:var(--teal-900);background:var(--teal-100);padding:7px 14px;border-radius:20px;font-weight:600;transition:background .15s;}
.btn-ghost-sm:hover{background:var(--teal-300);}

/* ---------- Buttons ---------- */
.btn-primary{background:linear-gradient(135deg,var(--teal-500),var(--teal-900));color:#fff;font-weight:700;font-size:14px;padding:12px 20px;border-radius:16px;box-shadow:0 8px 20px -8px rgba(14,179,174,.6);transition:transform .12s,box-shadow .12s;}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px -10px rgba(14,179,174,.7);}
.btn-primary:disabled{opacity:.55;cursor:not-allowed;transform:none;}
.btn-outline{border:1.5px solid var(--teal-500)!important;color:var(--teal-900);font-weight:700;font-size:13px;padding:9px 18px;border-radius:14px;background:#fff;transition:background .15s;}
.btn-outline.following{background:var(--teal-100);border-color:var(--teal-100)!important;}
.btn-outline:hover{background:var(--teal-100);}

/* ---------- Auth ---------- */
.auth-wrap{min-height:88vh;display:flex;align-items:center;justify-content:center;position:relative;}
.blob{position:fixed;border-radius:42% 58% 63% 37%/41% 44% 56% 59%;background:linear-gradient(135deg,var(--teal-500),var(--teal-300));opacity:.5;z-index:0;animation:float 9s ease-in-out infinite;}
@keyframes float{0%,100%{transform:translateY(0) rotate(0deg);}50%{transform:translateY(-14px) rotate(4deg);}}
.blob1{width:280px;height:280px;top:-80px;right:-90px;}
.blob2{width:340px;height:340px;bottom:-140px;left:-120px;opacity:.35;animation-delay:2s;}
.auth-card{position:relative;z-index:1;background:var(--card);border-radius:30px;box-shadow:var(--shadow-lift);padding:36px 34px 30px;width:100%;max-width:380px;}
.auth-tabs{display:flex;gap:22px;margin-bottom:22px;}
.auth-tab{font-weight:700;font-size:16px;color:var(--ink-soft);padding-bottom:8px;border-bottom:3px solid transparent;transition:color .15s;}
.auth-tab.active{color:var(--teal-900);border-color:var(--teal-500);}
.field{margin-bottom:14px;}
.field label{display:block;font-size:12.5px;color:var(--ink-soft);margin-bottom:6px;font-weight:600;}
.field input,.field textarea{width:100%;padding:12px 14px;border-radius:14px;border:1.5px solid var(--line);background:#f6fdfc;font-size:14px;color:var(--ink);outline:none;transition:border-color .15s,background .15s;}
.field input:focus,.field textarea:focus{border-color:var(--teal-500);background:#fff;}
.auth-error{color:var(--pink);font-size:12.5px;margin:-4px 0 12px;font-weight:600;}
.auth-brand{display:flex;flex-direction:column;align-items:center;gap:2px;margin-top:22px;}
.auth-brand .brand-logo{width:58px;height:58px;object-fit:contain;margin-bottom:4px;filter:drop-shadow(0 6px 14px rgba(14,179,174,.35));}
.auth-brand .name{font-weight:800;font-size:22px;color:var(--teal-900);}
.auth-brand .eng{font-size:10px;letter-spacing:5px;color:var(--teal-500);font-weight:700;}
.avatar-pick{display:flex;align-items:center;gap:12px;margin-bottom:16px;}
.avatar-pick .preview{width:52px;height:52px;border-radius:50%;object-fit:cover;background:var(--teal-100);flex-shrink:0;}
.avatar-pick label span{font-size:12px;color:var(--teal-700);font-weight:700;cursor:pointer;background:var(--teal-100);padding:8px 12px;border-radius:12px;display:inline-block;transition:background .15s;}
.avatar-pick label span:hover{background:var(--teal-300);}

/* ---------- Avatar fallback ---------- */
.avatar{border-radius:50%;object-fit:cover;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;}

/* ---------- Feed layout ---------- */
.feed-layout{display:grid;grid-template-columns:1fr 250px;gap:20px;align-items:start;}
@media(max-width:900px){.feed-layout{grid-template-columns:1fr;}}
.feed-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}
@media(max-width:620px){.feed-grid{grid-template-columns:1fr;}}
.post-tile{position:relative;border-radius:var(--radius-lg);overflow:hidden;aspect-ratio:1/1;background:linear-gradient(135deg,var(--teal-100),var(--teal-300));box-shadow:var(--shadow);cursor:pointer;transition:transform .18s,box-shadow .18s;}
.post-tile:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift);}
@media(max-width:620px){.post-tile{aspect-ratio:16/13;}}
.post-tile img,.post-tile video{width:100%;height:100%;object-fit:cover;display:block;}
.post-tile .tile-head{position:absolute;top:10px;left:10px;right:10px;display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.88);backdrop-filter:blur(4px);padding:6px 10px;border-radius:20px;}
.tile-head .tname{font-size:12px;font-weight:700;color:var(--ink);flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.tile-head .ttime{font-size:10px;color:var(--ink-soft);flex-shrink:0;}
.play-badge{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none;}
.play-badge svg{width:44px;height:44px;filter:drop-shadow(0 4px 10px rgba(0,0,0,.35));}
.empty-feed{grid-column:1/-1;text-align:center;padding:60px 20px;color:var(--ink-soft);}
.empty-feed .big{font-size:40px;margin-bottom:10px;}

.filter-card{background:var(--card);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:18px;}
.filter-card h4{margin:0 0 10px;font-size:13px;color:var(--ink-soft);}
.filter-opt{display:flex;align-items:center;justify-content:space-between;padding:8px 0;font-size:13.5px;font-weight:600;cursor:pointer;}
.radio-dot{width:16px;height:16px;border-radius:50%;border:2px solid var(--teal-300);display:inline-flex;align-items:center;justify-content:center;}
.radio-dot.on{border-color:var(--teal-500);}
.radio-dot.on::after{content:'';width:8px;height:8px;border-radius:50%;background:var(--teal-500);}
.filter-div{height:1px;background:var(--line);margin:10px 0;}

/* ---------- Post detail ---------- */
.post-detail{display:grid;grid-template-columns:1fr 340px;gap:20px;}
@media(max-width:820px){.post-detail{grid-template-columns:1fr;}}
.back-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:var(--card);box-shadow:var(--shadow);margin-bottom:14px;transition:transform .15s;}
.back-btn:hover{transform:translateX(3px);}
.media-card{background:#000;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);position:relative;}
.media-card img,.media-card video{width:100%;max-height:640px;object-fit:contain;display:block;background:#000;}
.media-actions{display:flex;align-items:center;gap:16px;padding:14px 16px;background:var(--card);border-radius:0 0 var(--radius-lg) var(--radius-lg);margin-top:-2px;}
.icon-btn{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--ink-soft);transition:transform .12s;}
.icon-btn:hover{transform:scale(1.06);}
.icon-btn svg{width:22px;height:22px;}
.icon-btn.liked{color:var(--pink);}
.icon-btn.saved{color:var(--teal-700);}
.icon-btn.danger{color:var(--pink);}
.caption-box{background:var(--card);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:16px 18px;margin-top:14px;font-size:14px;line-height:2;color:var(--ink);}

.comments-panel{background:var(--card);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:16px;display:flex;flex-direction:column;max-height:640px;}
.post-author-row{display:flex;align-items:center;gap:10px;margin-bottom:14px;padding-bottom:14px;border-bottom:1px solid var(--line);cursor:pointer;}
.post-author-row .pname{font-weight:700;font-size:14px;}
.post-author-row .ptime{font-size:11.5px;color:var(--ink-soft);}
.comments-title{font-weight:700;font-size:13.5px;color:var(--ink-soft);margin-bottom:10px;}
.comment-list{overflow-y:auto;flex:1;display:flex;flex-direction:column;gap:14px;padding-inline-end:4px;}
.comment-item{display:flex;gap:10px;}
.comment-item .cbody{background:#f4fdfc;border-radius:14px;padding:8px 12px;flex:1;}
.comment-item .cname{font-size:12.5px;font-weight:700;}
.comment-item .ctext{font-size:13px;margin-top:2px;color:var(--ink);}
.comment-item .ctime{font-size:10.5px;color:var(--ink-soft);margin-top:4px;}
.comment-form{display:flex;gap:8px;margin-top:12px;border-top:1px solid var(--line);padding-top:12px;}
.comment-form input{flex:1;border:1.5px solid var(--line);border-radius:16px;padding:10px 14px;font-size:13px;background:#f6fdfc;outline:none;}
.comment-form input:focus{border-color:var(--teal-500);}
.send-btn{width:38px;height:38px;border-radius:50%;background:var(--teal-500);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:transform .12s;}
.send-btn:hover{transform:scale(1.08);}
.send-btn svg{width:17px;height:17px;}
.empty-comments{color:var(--ink-soft);font-size:12.5px;text-align:center;padding:20px 0;}

/* ---------- Profile ---------- */
.profile-head{display:flex;flex-direction:column;align-items:center;text-align:center;padding:26px 0 10px;}
.profile-head .avatar{width:96px;height:96px;font-size:34px;margin-bottom:12px;box-shadow:0 0 0 4px #fff, 0 0 0 7px var(--teal-100);}
.profile-head h2{margin:0 0 2px;font-size:19px;}
.profile-head .handle{color:var(--teal-700);font-size:13px;font-weight:600;margin-bottom:14px;}
.stats-row{display:flex;gap:34px;margin:6px 0 16px;}
.stat{text-align:center;}
.stat b{display:block;font-size:17px;}
.stat span{font-size:11.5px;color:var(--ink-soft);}
.bio-text{max-width:420px;font-size:13px;color:var(--ink-soft);margin-bottom:10px;line-height:1.9;}
.profile-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px;}
@media(max-width:620px){.profile-grid{grid-template-columns:repeat(3,1fr);}}
.profile-grid .cell{aspect-ratio:1/1;border-radius:14px;overflow:hidden;background:var(--teal-100);position:relative;cursor:pointer;transition:transform .15s;}
.profile-grid .cell:hover{transform:scale(1.03);}
.profile-grid .cell img,.profile-grid .cell video{width:100%;height:100%;object-fit:cover;}

/* ---------- Search ---------- */
.search-bar{background:var(--card);border-radius:20px;box-shadow:var(--shadow);padding:14px 18px;margin-bottom:20px;}
.search-bar input{width:100%;border:none;outline:none;font-size:14px;background:transparent;text-align:right;}
.user-row{display:flex;align-items:center;gap:12px;background:var(--card);border-radius:18px;box-shadow:var(--shadow);padding:12px 14px;margin-bottom:10px;cursor:pointer;transition:transform .12s;}
.user-row:hover{transform:translateX(-2px);}
.user-row .info{flex:1;}
.user-row .uname{font-weight:700;font-size:13.5px;}
.user-row .uhandle{font-size:11.5px;color:var(--ink-soft);}
.search-empty{text-align:center;color:var(--ink-soft);padding:50px 10px;font-size:13.5px;}

/* ---------- Compose ---------- */
.compose-card{background:var(--card);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:22px;max-width:480px;margin:0 auto;}
.drop-zone{border:2px dashed var(--teal-300);border-radius:18px;padding:30px 14px;text-align:center;color:var(--teal-700);font-size:13px;font-weight:600;cursor:pointer;background:#f6fdfc;margin-bottom:16px;transition:background .15s,border-color .15s;}
.drop-zone:hover{background:var(--teal-100);border-color:var(--teal-500);}
.drop-zone svg{width:30px;height:30px;margin-bottom:8px;}
.media-preview{width:100%;max-height:340px;border-radius:16px;overflow:hidden;margin-bottom:16px;background:#000;}
.media-preview img,.media-preview video{width:100%;max-height:340px;object-fit:contain;display:block;}
.type-toggle{display:flex;gap:8px;margin-bottom:14px;}
.type-toggle button{flex:1;padding:9px;border-radius:12px;background:#f6fdfc;border:1.5px solid var(--line);font-size:12.5px;font-weight:700;color:var(--ink-soft);transition:background .15s;}
.type-toggle button.active{background:var(--teal-100);color:var(--teal-900);border-color:var(--teal-500);}

.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:11px 22px;border-radius:24px;font-size:13px;font-weight:600;z-index:200;box-shadow:0 10px 24px -8px rgba(0,0,0,.4);animation:toastIn .25s ease;}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,10px);}to{opacity:1;transform:translate(-50%,0);}}
.spinner{width:22px;height:22px;border:3px solid var(--teal-100);border-top-color:var(--teal-700);border-radius:50%;animation:spin .7s linear infinite;margin:40px auto;}
@keyframes spin{to{transform:rotate(360deg);}}
.loading-wrap{text-align:center;padding:60px 0;color:var(--ink-soft);font-size:13px;}