:root{
  --face:        #C0C0C0;
  --face-light:  #DFDFDF;
  --shadow:      #808080;
  --shadow-dk:   #000000;
  --hilite:      #FFFFFF;
  --desktop:     #008080;
  --titlebar-a:  #000080;
  --titlebar-b:  #1084D0;
  --titlebar-txt:#FFFFFF;
  --selected:    #000080;
  --selected-txt:#FFFFFF;
  --ink:         #000000;
  --link:        #0000EE;
  --ok:          #007A33;
  --bad:         #A80000;
  --dos-bg:      #000000;
  --dos-txt:     #C0C0C0;
  --dos-txt-2:   #55FF55;
  --font-body: Tahoma, "Segoe UI", Verdana, Geneva, Arial, sans-serif;
  --font-title: Tahoma, "Segoe UI", Verdana, Geneva, Arial, sans-serif;
  --font-mono: "Courier New", Consolas, monospace;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  background:var(--desktop);
  background-image:
    linear-gradient(135deg, rgba(255,255,255,0.03) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255,255,255,0.03) 25%, transparent 25%);
  background-size:6px 6px;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:13px;
  overscroll-behavior:none;
}

/* ---------- bevel helpers ---------- */
.bevel-out{
  background:var(--face);
  border-top:1px solid var(--hilite); border-left:1px solid var(--hilite);
  border-right:1px solid var(--shadow-dk); border-bottom:1px solid var(--shadow-dk);
  box-shadow:inset 1px 1px 0 var(--face-light), inset -1px -1px 0 var(--shadow);
}
.bevel-in{
  background:var(--face);
  border-top:1px solid var(--shadow); border-left:1px solid var(--shadow);
  border-right:1px solid var(--hilite); border-bottom:1px solid var(--hilite);
  box-shadow:inset 1px 1px 0 var(--shadow-dk), inset -1px -1px 0 var(--face-light);
}

/* ---------- Boot / BIOS-ish screen ---------- */
#boot-screen{
  position:fixed; inset:0; z-index:1000;
  background:#000; color:#C0C0C0;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:18px; text-align:center; padding:20px;
  font-family:var(--font-mono);
}
#boot-screen .boot-logo{
  font-size:20px; font-weight:bold; letter-spacing:0.04em; color:#FFFFFF;
}
#boot-screen .boot-sub{
  font-size:13px; color:#55FF55;
  letter-spacing:0.04em;
}
#boot-screen .boot-log{
  font-size:13px; color:#C0C0C0; min-height:76px; white-space:pre-line; text-align:left;
}
.btn-start{
  font-family:var(--font-body);
  font-size:13px;
  padding:8px 22px;
  cursor:pointer;
}
.btn-start:active{ border-top-color:var(--shadow-dk); border-left-color:var(--shadow-dk); border-right-color:var(--hilite); border-bottom-color:var(--hilite); box-shadow:inset 1px 1px 0 var(--shadow-dk), inset -1px -1px 0 var(--face-light); }

/* ---------- App window ---------- */
#app{
  display:flex; flex-direction:column;
  min-height:100vh;
  padding:10px;
}
.window{
  display:flex; flex-direction:column;
  flex:1; min-height:0;
  background:var(--face);
  border-top:2px solid var(--hilite); border-left:2px solid var(--hilite);
  border-right:2px solid var(--shadow-dk); border-bottom:2px solid var(--shadow-dk);
  box-shadow:inset 1px 1px 0 var(--face-light), inset -1px -1px 0 var(--shadow);
}
.titlebar{
  background:linear-gradient(90deg, var(--titlebar-a), var(--titlebar-b));
  color:var(--titlebar-txt);
  display:flex; align-items:center; gap:6px;
  padding:3px 4px;
  flex:none;
}
.titlebar .app-icon{
  width:16px; height:16px; flex:none;
  display:grid; grid-template-columns:1fr 1fr; grid-template-rows:1fr 1fr; gap:1px;
}
.titlebar .app-icon span:nth-child(1){ background:#2EE6C8; }
.titlebar .app-icon span:nth-child(2){ background:#FF9F2E; }
.titlebar .app-icon span:nth-child(3){ background:#C060FF; }
.titlebar .app-icon span:nth-child(4){ background:#FFE24A; }
.titlebar .title-text{
  flex:1; font-size:13px; font-weight:bold; white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.win-btn{
  width:18px; height:16px; flex:none;
  background:var(--face);
  border-top:1px solid var(--hilite); border-left:1px solid var(--hilite);
  border-right:1px solid var(--shadow-dk); border-bottom:1px solid var(--shadow-dk);
  font-size:11px; line-height:14px; text-align:center; color:#000; cursor:pointer; padding:0;
  font-family:var(--font-body);
}
.win-btn:active{ border-color:var(--shadow-dk) var(--hilite) var(--hilite) var(--shadow-dk); }

.menubar{
  display:flex; gap:14px; padding:3px 8px;
  border-bottom:1px solid var(--shadow);
  background:var(--face);
  flex:none; font-size:13px;
}
.menubar span{ cursor:default; }
.menubar span:hover{ background:var(--selected); color:var(--selected-txt); padding:0 3px; margin:0 -3px; }

.toolbar{
  display:flex; align-items:center; gap:8px; flex-wrap:wrap;
  padding:5px 8px;
  border-bottom:1px solid var(--shadow);
  background:var(--face);
  flex:none;
}
.toolbar .status-text{ font-size:13px; }
.toolbar .spacer{ flex:1; }

/* ---------- Layout ---------- */
main.layout{ flex:1; display:flex; min-height:0; background:var(--hilite); }

nav.case-list{
  width:280px; flex:none;
  background:#FFFFFF;
  border-right:2px solid var(--shadow);
  overflow-y:auto;
  padding:6px;
  transition:margin-left .15s ease;
}
nav.case-list.collapsed{ display:none; }

@media (max-width:820px){
  nav.case-list{
    position:fixed; top:0; left:0; bottom:0; z-index:60;
    width:82vw; max-width:340px;
    box-shadow:2px 0 10px rgba(0,0,0,0.4);
  }
  nav.case-list.collapsed{ display:none; }
  #sidebar-backdrop{
    display:none;
    position:fixed; inset:0; background:rgba(0,0,0,0.35); z-index:55;
  }
  #sidebar-backdrop.show{ display:block; }
}

.nivel-heading{
  font-size:12px; font-weight:bold;
  color:#000080;
  padding:8px 4px 3px;
  border-bottom:1px solid #C0C0C0;
  margin-bottom:3px;
}
.case-tab{
  display:flex; align-items:center; gap:8px;
  width:100%; text-align:left;
  background:transparent;
  border:1px solid transparent;
  color:var(--ink);
  padding:4px 6px;
  margin-bottom:1px;
  cursor:pointer;
  font-family:var(--font-body);
  font-size:13px;
}
.case-tab:hover{ background:#E8EEFA; }
.case-tab.locked{ color:#909090; cursor:not-allowed; }
.case-tab.solved .ttl{ font-style:normal; }
.case-tab.active{ background:var(--selected); color:var(--selected-txt); }
.case-tab .num{ font-family:var(--font-mono); font-size:12px; flex:none; width:40px; opacity:0.75; }
.case-tab .ttl{ flex:1; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.case-tab .mark{ flex:none; font-size:12px; }

/* ---------- Detail panel ---------- */
section.detail{ flex:1; overflow-y:auto; padding:16px 18px 60px; background:#FFFFFF; position:relative; }

.groupbox{
  border:1px solid var(--shadow);
  border-top-color:var(--shadow);
  padding:14px 12px 12px;
  margin:0 0 14px;
  position:relative;
}
.groupbox::before{
  content:attr(data-label);
  position:absolute; top:-9px; left:10px;
  background:#FFFFFF;
  padding:0 5px;
  font-size:12px; font-weight:bold; color:#000080;
}

.folder-header{ display:flex; align-items:flex-start; justify-content:space-between; gap:14px; margin-bottom:12px; }
.folder-header .num-stamp{
  font-family:var(--font-mono);
  font-size:12px; font-weight:bold;
  color:#000080;
}
.folder-header h2{
  font-family:var(--font-title);
  font-size:17px;
  line-height:1.35;
  margin:4px 0 0;
  color:var(--ink);
}
.meta-row{
  display:flex; flex-wrap:wrap; gap:14px;
  font-size:13px;
  color:#333;
  margin-bottom:14px;
}
.meta-row span b{ color:#000; font-weight:bold; }

.stamp-resuelto{
  position:absolute; top:14px; right:16px;
  border:3px solid var(--bad);
  color:var(--bad);
  font-family:var(--font-title);
  font-weight:bold;
  font-size:13px;
  letter-spacing:0.04em;
  padding:5px 10px;
  transform:rotate(6deg);
  opacity:0.85;
  pointer-events:none;
  background:rgba(255,255,255,0.6);
}

.card{
  border:1px solid var(--shadow);
  border-top:1px solid #ADA99C;
  background:#F7F7F2;
  padding:12px 14px;
  margin-bottom:14px;
}
.card h3{
  font-family:var(--font-title);
  font-size:12px;
  font-weight:bold;
  color:#000080;
  margin:0 0 8px;
  border-bottom:1px solid #D8D8D0;
  padding-bottom:4px;
}
.card p{ margin:0; line-height:1.55; font-size:14px; }
.pregunta-box p{ font-weight:normal; }

.hints{ display:flex; flex-direction:column; gap:8px; }
.hint-btn{
  align-self:flex-start;
  font-family:var(--font-body);
  font-size:13px;
  padding:5px 10px;
  cursor:pointer;
}
.hint-text{
  font-family:var(--font-body);
  font-size:13.5px;
  color:var(--ink);
  background:#FFFFE1;
  border:1px solid #ACA899;
  padding:7px 9px;
}

/* ---------- SQL "MS-DOS" terminal ---------- */
.terminal{
  border:1px solid var(--shadow-dk);
  overflow:hidden;
  margin-bottom:14px;
}
.terminal .term-bar{
  display:flex; align-items:center; gap:6px; justify-content:space-between;
  background:linear-gradient(90deg, var(--titlebar-a), var(--titlebar-b));
  padding:3px 6px;
  font-size:12px; font-weight:bold;
  color:#fff;
}
textarea#sql-input{
  width:100%; min-height:92px;
  background:var(--dos-bg); color:var(--dos-txt-2);
  border:none; outline:none; resize:vertical;
  font-family:var(--font-mono); font-size:14px; line-height:1.5;
  padding:10px 12px;
}
.term-actions{ display:flex; gap:8px; align-items:center; padding:6px 8px; background:var(--face); border-top:1px solid var(--shadow); flex-wrap:wrap; }
button{ font-family:var(--font-body); cursor:pointer; }
.btn{
  font-family:var(--font-body);
  font-size:13px;
  padding:5px 14px;
  background:var(--face);
  border-top:1px solid var(--hilite); border-left:1px solid var(--hilite);
  border-right:1px solid var(--shadow-dk); border-bottom:1px solid var(--shadow-dk);
  box-shadow:inset 1px 1px 0 var(--face-light), inset -1px -1px 0 var(--shadow);
}
.btn:active{
  border-top:1px solid var(--shadow-dk); border-left:1px solid var(--shadow-dk);
  border-right:1px solid var(--hilite); border-bottom:1px solid var(--hilite);
  box-shadow:inset 1px 1px 0 var(--shadow-dk), inset -1px -1px 0 var(--face-light);
}
.btn-primary{ font-weight:bold; }
.btn-ghost{ }
.query-error{ font-family:var(--font-mono); font-size:13px; color:var(--bad); padding:0 10px 8px; background:var(--face); }

.results-wrap{ overflow:auto; max-height:250px; border:1px solid var(--shadow-dk); margin-bottom:14px; }
table.results{ width:100%; border-collapse:collapse; font-family:var(--font-mono); font-size:13px; }
table.results th{ position:sticky; top:0; background:var(--face); color:#000; text-align:left; padding:5px 8px; border-bottom:1px solid var(--shadow-dk); border-right:1px solid var(--shadow); white-space:nowrap; }
table.results td{ padding:4px 8px; border-bottom:1px solid #D8D8D8; border-right:1px solid #E8E8E8; color:#000; white-space:nowrap; }
table.results tr:nth-child(even) td{ background:#F0F4FB; }

.schema-toggle{ font-family:var(--font-body); font-size:13px; color:var(--link); background:none; border:none; text-decoration:underline; padding:0; margin-bottom:10px; cursor:pointer; }
.schema-box{
  display:none;
  font-family:var(--font-mono); font-size:12.5px; color:#000;
  background:#FFFFE1; border:1px solid #ACA899;
  padding:10px 12px; margin-bottom:14px; white-space:pre-wrap; line-height:1.5;
}
.schema-box.open{ display:block; }

.verdict-row{ display:flex; gap:8px; flex-wrap:wrap; align-items:center; }
input#answer-input{
  flex:1; min-width:180px;
  background:#fff; color:#000;
  border-top:1px solid var(--shadow); border-left:1px solid var(--shadow);
  border-right:1px solid var(--hilite); border-bottom:1px solid var(--hilite);
  padding:6px 8px;
  font-family:var(--font-body); font-size:14px;
}
.feedback{ margin-top:10px; font-size:13.5px; padding:8px 10px; border:1px solid; font-family:var(--font-body); }
.feedback.ok{ background:#E4FBE4; color:var(--ok); border-color:var(--ok); }
.feedback.bad{ background:#FBE4E4; color:var(--bad); border-color:var(--bad); }

.empty-state{ display:flex; flex-direction:column; align-items:center; justify-content:center; height:60vh; text-align:center; color:#555; gap:12px; padding:0 20px; }
.empty-state .glyph{ font-size:40px; }
.empty-state h2{ font-family:var(--font-title); color:#000080; margin:0; font-size:18px; }
.empty-state p{ font-size:14px; max-width:340px; line-height:1.5; }

/* ---------- Flag / final screen: styled like a message box ---------- */
.flag-screen{ max-width:520px; margin:10px auto; }
.msgbox{
  background:var(--face);
  border-top:2px solid var(--hilite); border-left:2px solid var(--hilite);
  border-right:2px solid var(--shadow-dk); border-bottom:2px solid var(--shadow-dk);
}
.msgbox .titlebar{ font-size:13px; }
.msgbox .msgbody{ display:flex; gap:14px; padding:16px; background:var(--face); }
.msgbox .msgbody .icon{ font-size:34px; flex:none; }
.flag-box{
  background:#FFFFFF; border:1px solid var(--shadow-dk);
  padding:16px; text-align:center; margin:14px 0;
}
.flag-value{
  font-family:var(--font-mono); font-size:15px; color:#000080;
  background:#F0F0F0; border:1px inset var(--shadow);
  padding:12px; margin:10px 0; word-break:break-all; user-select:all;
}
.install-tip{ font-family:var(--font-body); font-size:12.5px; color:#333; text-align:center; padding:6px 16px 16px; }

/* ---------- Taskbar ---------- */
.taskbar{
  flex:none;
  display:flex; align-items:center; gap:8px;
  background:var(--face);
  border-top:2px solid var(--hilite);
  padding:3px 6px;
  margin-top:8px;
}
.start-btn{
  display:flex; align-items:center; gap:6px;
  font-weight:bold; font-size:13px;
  padding:4px 10px;
}
.start-btn .flag-icon{
  width:14px; height:14px;
  display:grid; grid-template-columns:1fr 1fr; grid-template-rows:1fr 1fr; gap:1px;
}
.start-btn .flag-icon span:nth-child(1){ background:#2EE6C8; }
.start-btn .flag-icon span:nth-child(2){ background:#FF9F2E; }
.start-btn .flag-icon span:nth-child(3){ background:#C060FF; }
.start-btn .flag-icon span:nth-child(4){ background:#FFE24A; }
.task-app{
  flex:1;
  display:flex; align-items:center; gap:6px;
  font-size:13px;
  padding:4px 10px;
  min-width:0;
}
.task-app span{ overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.tray{
  display:flex; align-items:center; gap:8px;
  padding:3px 10px;
  font-family:var(--font-mono); font-size:12.5px;
  border-top:1px solid var(--shadow); border-left:1px solid var(--shadow);
  border-right:1px solid var(--hilite); border-bottom:1px solid var(--hilite);
}
.tray button{ background:none; border:none; font-size:14px; cursor:pointer; padding:0; }
#clock{ min-width:52px; text-align:center; }

::-webkit-scrollbar{ width:16px; height:16px; }
::-webkit-scrollbar-track{ background:var(--face); }
::-webkit-scrollbar-thumb{ background:var(--face); border-top:1px solid var(--hilite); border-left:1px solid var(--hilite); border-right:1px solid var(--shadow-dk); border-bottom:1px solid var(--shadow-dk); }