:root{
  --bg-1: #ece7dd;
  --bg-2: #e4ded2;
  --ink: #1c1b18;
  --muted: rgba(28,27,24,.62);
  --panel: rgba(255,255,255,.28);
  --panel-border: rgba(255,255,255,.35);
  --shadow: rgba(0,0,0,.12);
  --radius: 14px;
}

*{ box-sizing: border-box; }
html,body{ height:100%; margin:0; }

body{
  font-family: ui-serif, Georgia, "Times New Roman", Times, serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 900px at 20% 10%, rgba(255,255,255,.35), transparent 55%),
    radial-gradient(900px 600px at 90% 20%, rgba(0,0,0,.05), transparent 60%),
    linear-gradient(135deg, var(--bg-1), var(--bg-2));
  overflow: hidden;
}

/* subtle texture */
body::before{
  content:"";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(0,0,0,.015) 0px, rgba(0,0,0,.015) 1px, transparent 2px, transparent 3px),
    repeating-linear-gradient(90deg, rgba(0,0,0,.01) 0px, rgba(0,0,0,.01) 1px, transparent 2px, transparent 4px);
  mix-blend-mode: multiply;
  opacity: .55;
}

body::after{
  content:"";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(900px 700px at 75% 75%, transparent 40%, rgba(0,0,0,.1) 100%);
  opacity: .25;
}

/* login panel */
.login{
  position: fixed;
  top: 18px;
  right: 18px;
  width: 300px;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: 0 10px 30px var(--shadow);
  backdrop-filter: blur(8px);
}

.label{
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
  font-family: ui-sans-serif, system-ui;
}

.row{ display: grid; gap: 8px; }

input{
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(0,0,0,.12);
  background: rgba(255,255,255,.55);
  font-family: ui-sans-serif, system-ui;
}

.actions{
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
}

button{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: 10px;
  border: 1px solid rgba(0,0,0,.16);
  background: rgba(255,255,255,.45);
  cursor: pointer;
  font-family: ui-sans-serif, system-ui;
}

button:disabled{ opacity: .65; }

.spinner{
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(28,27,24,.25);
  border-top-color: rgba(28,27,24,.75);
  display: none;
  animation: spin .75s linear infinite;
}

button.loading .spinner{ display: inline-block; }

@keyframes spin{ to{ transform: rotate(360deg); } }

.hint{
  font-size: 12px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui;
}

.error{
  display: none;
  margin-top: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 12px;
  color: rgba(120,0,0,.85);
  background: rgba(255,255,255,.45);
  border: 1px solid rgba(120,0,0,.25);
  font-family: ui-sans-serif, system-ui;
}
.error.show{ display:block; }

/* engraved mark */
.mark{
  position: fixed;
  right: 36px;
  bottom: 34px;
  font-size: 56px;
  letter-spacing: .035em;
  text-transform: lowercase;
  color: rgba(0,0,0,.34);
  text-shadow:
    0 1px 0 rgba(255,255,255,.7),
    0 -1px 0 rgba(0,0,0,.16),
    0 10px 32px rgba(0,0,0,.12);
}

.mark .word{ letter-spacing: .02em; }

.mark small{
  font-size: 1em;          /* same size as text */
  letter-spacing: .12em;
  margin-left: 14px;
  opacity: .95;
}