:root{
    --bg-color: #030417;
    --star-color: #ffffff;
    --nebula-color: rgba(120,100,255,0.06);
    --speed-layer1: 330s;
    --speed-layer2: 180s;
    --speed-layer3: 120s;
    --twinkle-speed: 3.5s;

    --panel: #14182b;
    --muted: #8b93a7;
    --txt: #e9ecf1;
    --brand: #7dd3fc;
    --brand-2: #60a5fa;
    --ok: #22c55e;
    --warn: #eab308;
    --err: #ef4444;
    --radius: 18px;
    --gap: 14px;

}

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,body{
  height:100%;
  background: var(--bg-color);
  /* overflow:hidden; */
}
body::before,
body::after,
.star-layer-2 {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* far stars */
body::before {
  background-image:
    radial-gradient(1px 1px at 10% 20%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 70% 80%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 40% 50%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 85% 15%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 20% 85%, var(--star-color) 50%, transparent 51%);
  background-size: 250px 250px;
  opacity: 0.35;
  animation: move-stars var(--speed-layer1) linear infinite;
}

/* mid stars */
.star-layer-2 {
  background-image:
    radial-gradient(1px 1px at 5% 25%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 45% 5%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 75% 60%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1px 1px at 35% 80%, var(--star-color) 50%, transparent 51%);
  background-repeat: repeat;
  background-size: 400px 400px;
  opacity: 0.6;
  animation: move-stars var(--speed-layer2) linear infinite reverse;
}
/* near stars */
body::after {
  background-image:
    radial-gradient(1.6px 1.6px at 12% 40%, var(--star-color) 50%, transparent 51%),
    radial-gradient(2px 2px at 55% 15%, var(--star-color) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 80% 70%, var(--star-color) 50%, transparent 51%);
  background-size: 900px 900px;
  opacity: 0.8;
  animation: move-stars var(--speed-layer3) linear infinite;
}
@keyframes move-stars {
  from { background-position: 0 0; }
  to { background-position: -1000px 500px; }
}

/* make sure page content is above stars */
header, main, .footer, aside, section {
  position: relative;
  z-index: 1;
}

header, main, .footer, .editor-wrap, .editor {
  position: relative;
  z-index: 2;
}

/* normal code */
body{
    font-family: sans-serif;
    color: var(--txt);
}
header{
    padding: 10px;
    background: linear-gradient(90deg, rgba(96, 165, 250, 0.15), rgba(125, 211, 252, 0.1));
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.container{
    max-width: 1200px;
    margin-inline: auto;
    padding: 14px;
    justify-content: space-between;
}
.brand{
    display: flex; /* 1-d suitable layout*/
    align-items: center;
    gap: 10px;
    font-weight: 700;
}
.brand .logo{
    inline-size: 36px;
    block-size: 36px;
    border-radius: 15px;

    background: url("./images/logo.png") center / cover no-repeat;
}
.title{
    font-size: clamp(18px, 2vw, 22px);
}
main{
    max-width: 1516px;
    margin-inline: auto;
    padding: 18px;
    display: grid; /*suitable for 2d layout in css*/
    grid-template-columns: 280px 1fr 360px;
    gap: var(--gap);
}
@media(max-width: 1100px){
    main{
        grid-template-columns: 1fr;
    }
}

.card
{
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.03));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.05);
}

.panel{
    padding: 18px;
}
h2,h3{
    margin: 0 0 12px;
}
.muted{
    color: var(--muted);
    font-size: 13px;
}
.stack{
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.row{
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: space-between;
}
.btn{
    appearance: none;
    border: none;
    background: linear-gradient(180deg, var(--brand-2), var(--brand));
    color: #0b111f;
    font-weight: 700;
    padding: 10px 14px;
    border: 12px;
    cursor: pointer;
    box-shadow: 0 10px 24px rgba(96, 165, 250 ,0.35);
}
.btn.secondary{
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--txt);
    box-shadow: none;
}
.btn.warn{
    background: linear-gradient(180deg, #f59e0b, #eab308);
}
.btn.ok{
    background: linear-gradient(180deg, #34d399, #22c55e);
}

.btn.err{
    background: linear-gradient(180deg, #fb7185, #ef4444);
}

.select, select, .text{
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--txt);
    padding: 10px 12px;
    border-radius: 12px;
}
textarea.text{
    width: 100%;
    min-height: 120px;

}
.tabs{
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.tab{
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.14);
    cursor: pointer;
    font-weight: 700;
    color: #fff;
}
.tab.active{
    background: linear-gradient(180deg, rbga(125, 211, 252, 0.18), rgba(96, 165, 250, 0.18));
    color: #00FF00 !important;
}

.editor-wrap{
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    overflow:hidden;
    min-height: 280px;
    background-color: transparent;
    /* background-color: rgba(11, 16, 32, 0.4); 0.4 = 40% opacity */
    /* backdrop-filter: blur(6px); */
}

.editor{
    /* inline-size: 100%; */
    width: 100%;
  height: 300px;
}
.editor-wrap, .editor {
  position: relative;
  z-index: 2;
}

iframe.preview{
    inline-size: 100%;
    block-size: 280px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    background-color: #fff;
}
.out{
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.12);
    padding: 10px;
    min-height: 160px;
    overflow: auto;
    white-space: pre-wrap;
}

.footer{
    opacity: 0.7;
    font-size: 12px;
    text-align: center;
    padding: 12px;
}

.kbd{
    font-family: ui-monospace ;
    background-color: #0e1324;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    padding: 1px 6px;
}
.label{
    font-size: 15px;
    color: var(--muted);
}
.ace-dracula {
  background-color: rgba(11,16,32,0.4) !important;
  color: var(--txt) !important;
}
.ace-dracula .ace_gutter {
  background-color: rgba(11,16,32,0.3) !important;
  color: var(--muted) !important;
}