/* App header + phone tab bar (design prototype §3, §11.1). */
.app-header{
  position:sticky;top:0;z-index:40;height:60px;
  display:flex;align-items:center;gap:28px;padding:0 24px;
  background:
    radial-gradient(600px 120px at 0% 0%,color-mix(in srgb,var(--accent) 22%,transparent),transparent 70%),
    radial-gradient(500px 120px at 100% 0%,color-mix(in srgb,var(--accent-2) 14%,transparent),transparent 70%),
    var(--bg-2);
  border-bottom:1px solid var(--line);
  transition:background-color .3s,border-color .3s,color .3s;
}
:root[data-mode="light"] .app-header{background:var(--bg-2)}
.app-header::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--grad);opacity:.55;pointer-events:none}
.app-header .logo{display:flex;align-items:center;gap:10px;font:500 20px var(--serif);letter-spacing:.01em;color:var(--text);text-decoration:none;flex:none}
.app-header .logo .mk{width:28px;height:28px;border-radius:var(--r-sm);object-fit:cover;display:block}
.app-header nav.main{display:flex;gap:2px;min-width:0}
.app-header nav.main a{height:34px;padding:0 14px;border-radius:var(--r);color:var(--muted);font-weight:500;font-size:13.5px;transition:.15s;display:flex;align-items:center;text-decoration:none;white-space:nowrap}
.app-header nav.main a:hover{color:var(--text);background:var(--hover)}
.app-header nav.main a.on{color:var(--text);background:var(--accent-soft);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 40%,transparent)}
.app-header .h-right{margin-left:auto;display:flex;align-items:center;gap:10px;position:relative}
.hdr-menu{position:relative}
.hdr-guest{display:flex;gap:8px}

.theme-btn{display:flex;align-items:center;gap:8px;height:34px;padding:0 12px;border-radius:var(--r);border:1px solid var(--line-2);color:var(--muted);font-weight:500;font-size:13px}
.theme-btn:hover{color:var(--text);background:var(--surface-2)}
.theme-btn .dotz{display:flex}
.theme-btn .dotz i{width:10px;height:10px;border-radius:50%;border:1.5px solid var(--bg-2);margin-left:-3px}
.profile{display:flex;align-items:center;gap:9px;height:40px;padding:0 10px 0 4px;border-radius:999px;border:1px solid var(--line-2);transition:.15s}
.profile:hover,.hdr-menu-open>.profile{background:var(--surface-2);border-color:var(--line-3)}
.profile .nm{font-weight:500;font-size:13px;max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chev{width:14px;height:14px;color:var(--faint);transition:transform .2s}
.hdr-menu-open>button .chev{transform:rotate(180deg)}

.app-header .pop{
  position:absolute;top:50px;right:0;z-index:50;min-width:230px;padding:6px;border-radius:var(--r-lg);
  background:var(--surface);border:1px solid var(--line-2);
  box-shadow:0 20px 50px -10px var(--shadow);
  opacity:0;pointer-events:none;visibility:hidden;transform:translateY(-6px);transition:.15s;
}
.hdr-menu-open>.pop{opacity:1;pointer-events:auto;visibility:visible;transform:none}
.app-header .pop .who{display:flex;gap:10px;align-items:center;padding:10px 10px 12px;border-bottom:1px solid var(--line);margin-bottom:6px;color:var(--text);border-radius:0}
.app-header .pop .who:hover{background:none}
.app-header .pop .who b{display:block;font-weight:600;font-size:13px}
.app-header .pop .who small{display:block;color:var(--faint);font-size:12px}
.app-header .pop>a:not(.who),.app-header .pop>button{display:flex;align-items:center;gap:10px;width:100%;padding:8px 10px;border-radius:var(--r-sm);color:var(--muted);font-size:13px;cursor:pointer;text-decoration:none;text-align:left}
.app-header .pop>a:not(.who):hover,.app-header .pop>button:hover{background:var(--surface-2);color:var(--text)}
.app-header .pop hr{border:0;border-top:1px solid var(--line);margin:6px 0}
.app-header .pop.themes{width:290px;padding:14px}
.app-header .pop.themes h5{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);font-weight:600;margin-bottom:10px}

.tabbar{display:none}

@media (max-width:860px){
  .app-header{gap:14px;padding:0 14px}
  .app-header .logo .w,.app-header .profile .nm,.app-header .theme-btn .t{display:none}
  .app-header nav.main{overflow-x:auto}
  .app-header nav.main a{padding:0 10px}
}
@media (max-width:760px){
  body.has-tabbar{padding-bottom:calc(66px + env(safe-area-inset-bottom))}
  .app-header{height:calc(56px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 14px 0;gap:10px}
  .app-header nav.main{display:none}
  .app-header .h-right{gap:8px}
  .app-header .theme-btn{padding:0 10px;height:36px}
  .app-header .profile{height:40px;padding:0 8px 0 3px;gap:6px}
  .hdr-menu{position:static}
  .app-header .pop{position:fixed;top:calc(62px + env(safe-area-inset-top));left:12px;right:12px;min-width:0}
  .app-header .pop.themes{width:auto}
  .tabbar{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;z-index:45;
    padding:6px 8px calc(6px + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--bg-2) 92%,transparent);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 0;border-radius:var(--r-md);color:var(--faint);font-size:11px;font-weight:500;text-decoration:none;min-height:44px}
  .tabbar .ico{width:21px;height:21px}
  .tabbar a.on{color:var(--text)}
  .tabbar a.on .ico{color:var(--accent-text)}
}