*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0f0f1a; --surface: #16162a; --border: #2a2a46;
  --accent2: #3498db; --text: #dde1ee; --muted: #6b7094; --input-bg: #0b0b16;
  --danger: #e74c3c; --radius: 6px;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg); color: var(--text);
  height: 100vh; display: flex; align-items: center; justify-content: center;
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 40px 36px; width: 340px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.card h1 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.card h1 span { color: var(--accent2); font-weight: 400; font-size: 13px; }
.subtitle { font-size: 12px; color: var(--muted); margin-bottom: 28px; }
label {
  display: block; font-size: 11px; font-weight: 600; color: var(--muted);
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 6px;
}
input {
  display: block; width: 100%; background: var(--input-bg);
  border: 1px solid var(--border); color: var(--text);
  font-size: 13px; padding: 9px 12px; border-radius: var(--radius);
  outline: none; margin-bottom: 18px; transition: border-color 0.2s;
}
input:focus { border-color: var(--accent2); }
button {
  width: 100%; padding: 10px; background: var(--accent2);
  color: #fff; border: none; border-radius: var(--radius);
  font-size: 13px; font-weight: 700; cursor: pointer;
  letter-spacing: 0.04em; transition: opacity 0.15s; margin-top: 4px;
}
button:hover { opacity: 0.88; }
button:disabled { opacity: 0.5; cursor: default; }
#error-msg { font-size: 12px; color: var(--danger); margin-top: 14px; text-align: center; min-height: 16px; }