/* style.css (Faculty Zone) */

/* One-color page */
:root{
  --page-bg: #2f2f2f;      /* user can change later */
  --tabs-bg: rgba(255,255,255,0.12);
  --tabs-border: rgba(255,255,255,0.20);
  --text: #f2f2f2;
  --muted: rgba(255,255,255,0.78);

  --box-bg: rgba(240,240,240,0.92); /* gray box */
  --box-text: #202020;
  --box-muted: rgba(0,0,0,0.68);

  --radius: 12px;
  --shadow: 0 14px 40px rgba(0,0,0,.28);
}

*{ box-sizing:border-box; }
html, body{ height:100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--page-bg);
  color: var(--text);
  display:flex;
  flex-direction:column; /* makes footer stick to bottom */
}

/* Header */
.topbar{
  padding:18px 18px 10px;
}
.topbar-inner{
  max-width: 1200px;
  margin: 0 auto;
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px;
}
.brand-title{
  font-size: 30px;
  font-weight: 800;
  letter-spacing: .2px;
}
.brand-subtitle{
  margin-top:4px;
  font-size: 18px;
  opacity: .85;
}
.back-link{
  color: var(--text);
  opacity:.9;
  text-decoration:none;
  padding:8px 10px;
  border-radius: 10px;
  border: 1px solid var(--tabs-border);
  background: var(--tabs-bg);
}
.back-link:hover{ opacity:1; }

/* Main */
.page{
  flex:1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 18px 18px;
}

/* Tabs row above gray box */
.tabs{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--tabs-bg);
  border: 1px solid var(--tabs-border);
  margin: 8px 0 14px;
}

/* Tabs */
.tab-btn{
  appearance:none;
  border: 1px solid rgba(255,255,255,0.22);
  background: rgba(0,0,0,0.10);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 16px;
  cursor:pointer;
  line-height:1;
  white-space:nowrap;
}
.tab-btn:hover{
  background: rgba(0,0,0,0.18);
}

/* Dropdown */
.dropdown{
  position:relative;
  display:flex;
  align-items:center;
  gap:6px;
}

.dd-link{ display:inline-flex; align-items:center; gap:8px; }
.dd-link::after{ content:"▾"; font-size:.9em; opacity:.85; }
.dd-caret{
  appearance:none;
  border: 1px solid rgba(255,255,255,0.22);
  background: rgba(0,0,0,0.10);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 10px;
  cursor:pointer;
  line-height:1;
}
.dd-caret:hover{ background: rgba(0,0,0,0.18); }

.dropdown-menu{
  position:absolute;
  top: calc(100% + 8px);
  left:0;
  min-width: 220px;
  max-height: 320px;
  overflow:auto;
  background: rgba(30,30,30,0.98);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 8px;
  display:none;
  z-index: 50;
}
.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu,
.dropdown[aria-expanded="true"] .dropdown-menu{ display:block; }

.tab-dd-item{  width:100%;
  text-align:left;
  border:0;
  background: transparent;
  color: var(--text);
  padding: 10px 10px;
  border-radius: 10px;
  cursor:pointer;
  font-size: 14px;

  display:block;
  text-decoration:none;
}
.tab-dd-item:hover{ background: rgba(255,255,255,0.10); }

/* Content box (gray box) */
.content-box{
  background: var(--box-bg);
  color: var(--box-text);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}
.content-title{
  margin:0 0 8px;
  font-size: 20px;
}
.content-hint{
  margin:0;
  color: var(--box-muted);
}
.content-note{
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(0,0,0,0.06);
  color: rgba(0,0,0,0.75);
  font-size: 13px;
}

/* Popup */
.resource-popup::backdrop{
  background: rgba(0,0,0,0.60);
}
.resource-popup{
  border:0;
  padding:0;
  width: 85vw;
  height: 85vh;
  border-radius: 16px;
  overflow:hidden;
}
.popup-content{
  height:100%;
  background:#fff;
  position:relative;
  display:flex;
  flex-direction:column;
}
.popup-close{
  position:absolute;
  top: 12px;
  right: 12px;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 0;
  background: rgba(0,0,0,0.08);
  cursor:pointer;
  font-size: 20px;
  line-height:1;
}
.popup-head{
  padding: 18px 56px 10px 18px;
  border-bottom: 1px solid rgba(0,0,0,0.10);
}
.popup-title{
  margin:0 0 10px;
  font-size: 18px;
  color:#111;
}
.popup-actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}
.popup-actions a{
  text-decoration:none;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(0,0,0,0.14);
  background: #f6f6f6;
  color:#111;
  font-size: 13px;
}
.popup-actions a:hover{
  background:#ededed;
}

.popup-body{
  flex:1;
  padding: 14px 18px 18px;
}
.popup-body iframe{
  width:100%;
  height:100%;
  border:0;
  border-radius: 12px;
  background:#fff;
}

/* Footer at bottom */
.footer{
  margin-top:auto;
  padding: 14px 18px 18px;
}
.footer-inner{
  max-width: 1200px;
  margin: 0 auto;
  display:flex;
  justify-content:center;
}
.copyright{
  font-size: 15px; /* slightly bigger */
  opacity:.9;
}

/* Mobile tweaks */
@media (max-width: 600px){
  .topbar-inner{ align-items:flex-start; flex-direction:column; }
  .dropdown-menu{ min-width: 200px; }
}
/* --- Dropdown reliability tweaks: hover bridge + comfortable target --- */
.dd-menu{
  margin-top: 8px; /* small gap visually, bridge below keeps hover reliable */
}

/* Invisible bridge to prevent mouse-leave when moving into the menu */
.dd-menu::before{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:-10px;
  height:10px;
}
/* --- Download All in dropdowns --- */
.tab-dd-download{
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.06);
  margin-bottom: 6px;
}
.tab-dd-download:hover{
  background: rgba(255,255,255,0.12);
}

.tab-dd-sep{
  height: 1px;
  border: 0;
  background: rgba(255,255,255,0.14);
  margin: 6px 0 8px;
  border-radius: 999px;
}


/* Secure faculty login */
.topbar-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  justify-content:flex-end;
}
.logout-form{ margin:0; }
.logout-button{
  font:inherit;
  color:var(--text);
  cursor:pointer;
}
.login-page{
  flex:1;
  width:100%;
  display:grid;
  place-items:center;
  padding:24px 18px 40px;
}
.login-card{
  width:min(460px, 100%);
  padding:30px;
  border-radius:18px;
  background:var(--box-bg);
  color:var(--box-text);
  box-shadow:var(--shadow);
}
.login-lock{
  font-size:34px;
  line-height:1;
  margin-bottom:12px;
}
.login-card h1{
  margin:0 0 8px;
  font-size:26px;
}
.login-card > p{
  margin:0 0 22px;
  color:var(--box-muted);
}
.login-form{
  display:flex;
  flex-direction:column;
  gap:9px;
}
.login-form label{
  font-weight:700;
}
.login-form input{
  width:100%;
  padding:12px 13px;
  border:1px solid rgba(0,0,0,.22);
  border-radius:10px;
  font:inherit;
  background:#fff;
  color:#111;
}
.login-form input:focus{
  outline:3px solid rgba(81,44,128,.18);
  border-color:#512c80;
}
.login-form button{
  margin-top:7px;
  border:0;
  border-radius:10px;
  padding:12px 15px;
  background:#512c80;
  color:#fff;
  font:inherit;
  font-weight:700;
  cursor:pointer;
}
.login-form button:hover{ filter:brightness(1.08); }
.login-error{
  margin:0 0 16px;
  padding:10px 12px;
  border-radius:10px;
  background:#fff0f0;
  border:1px solid #dfaaaa;
  color:#7e2020;
}
@media (max-width:600px){
  .topbar-actions{ justify-content:flex-start; }
  .login-card{ padding:22px; }
}