/* DT Projekte · một file kiểu chữ cho cả app. Dùng được trên điện thoại. */
:root {
  --bg: #ffffff;
  --text: #000000;
  --muted: #555555;
  --line: #cccccc;
  --accent: #1f4e79;
  --ok-bg: #e6f2e6;
  --warn-bg: #fff4d6;
  --err-bg: #fde4e4;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}
header {
  display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-bottom: 2px solid var(--accent);
}
header .brand { font-weight: 700; color: var(--accent); text-decoration: none; font-size: 18px; }
nav { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
nav a { color: var(--text); }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
h1 { font-size: 24px; margin: 8px 0 16px; }
h2 { font-size: 18px; margin: 16px 0 8px; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.card { border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
.list { padding-left: 20px; }
.list li { margin: 6px 0; }
.badge { display: inline-block; font-size: 13px; padding: 0 6px; border: 1px solid var(--accent); border-radius: 4px; color: var(--accent); }
.badge.off { border-color: #999999; color: var(--muted); }
.flash { padding: 8px 12px; border-radius: 6px; }
.flash.ok { background: var(--ok-bg); }
.flash.warn { background: var(--warn-bg); }
.flash.err { background: var(--err-bg); }
form label { display: block; margin: 8px 0; }
form label.check { display: flex; gap: 8px; align-items: center; }
input, select { font: inherit; padding: 8px; width: 100%; max-width: 420px; border: 1px solid #999999; border-radius: 6px; display: block; margin-top: 4px; }
input[type="checkbox"] { width: auto; display: inline; margin: 0; }
button, .button {
  font: inherit; padding: 8px 14px; border-radius: 6px; border: 1px solid var(--accent);
  background: var(--accent); color: #ffffff; cursor: pointer; text-decoration: none; display: inline-block;
}
button.link { background: none; border: none; color: var(--accent); text-decoration: underline; padding: 0; }
button.small { padding: 4px 10px; font-size: 14px; }
form.inline { display: inline; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }