:root {
  --bg1: #ffffff;
  --bg2: #f9f9f9;
  --card: rgba(255, 255, 255, 0.9);
  --text: #000000;
  --muted: #666666;
  --line: rgba(0, 0, 0, 0.08);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  --brand1: #000000;
  --brand2: #333333;
  --btn: #000000;
  --btnText: #ffffff;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg1: #000000;
    --bg2: #0a0a0a;
    --card: rgba(18, 18, 18, 0.8);
    --text: #ffffff;
    --muted: #a0a0a0;
    --line: rgba(255, 255, 255, 0.1);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
    --btn: #ffffff;
    --btnText: #000000;
  }
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg1), var(--bg2));
  min-height: 100vh;
}

.container { padding: 40px 20px; display: flex; justify-content: center; }
.wrap { width: min(800px, 100%); display: grid; gap: 20px; }
.card { border: 1px solid var(--line); background: var(--card); backdrop-filter: blur(10px); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }

.logo { width: 40px; height: 40px; background: var(--brand1); border-radius: 8px; }
.btn { cursor: pointer; display: inline-flex; align-items: center; padding: 12px 20px; background: var(--btn); color: var(--btnText); border-radius: 8px; font-weight: 600; border: none; transition: 0.2s; }
.btn:hover { opacity: 0.8; transform: translateY(-1px); }

.codeblock { background: rgba(0,0,0,0.05); padding: 15px; border-radius: 8px; font-family: monospace; font-size: 13px; line-height: 1.6; margin-top: 10px; border: 1px solid var(--line); }
@media (prefers-color-scheme: dark) { .codeblock { background: rgba(255,255,255,0.05); } }

input[type="file"] { margin-bottom: 20px; }
select { padding: 8px; border-radius: 6px; background: var(--bg2); color: var(--text); border: 1px solid var(--line); }