:root {
  color-scheme: light dark;
  --bg: #10141a;
  --card-bg: #1b212b;
  --text: #e8ecf1;
  --muted: #9aa5b1;
  --accent: #4c8bf5;
  --accent-contrast: #fff;
  --danger: #e5484d;
  --warn: #e0a72e;
  --border: #2a3241;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, system-ui, sans-serif;
}

a { color: var(--accent); }

/* --- Top navigation --- */
.topnav {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topnav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--text); }
.lang-switch { display: flex; align-items: center; gap: 4px; margin-left: auto; margin-right: 8px; }
.lang-link {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.lang-link:hover { color: var(--text); }
.lang-link.active { color: var(--accent-contrast); background: var(--accent); border-color: var(--accent); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1.2rem;
  padding: 4px 10px;
  cursor: pointer;
}
.nav-links { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.nav-links a { text-decoration: none; color: var(--text); font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent); }
.nav-user { color: var(--muted); font-size: 0.9rem; }
.nav-form { display: inline; }

/* --- Layout --- */
.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px 56px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.centered-card { max-width: 480px; margin: 10vh auto; text-align: center; }

h1 { font-size: 1.5rem; margin: 0 0 12px; }
h2 { font-size: 1.1rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.hint { color: var(--muted); font-size: 0.82rem; margin: 4px 0 0; }
.hidden { display: none !important; }

/* --- Login / register / password forms --- */
.login-card {
  max-width: 420px;
  margin: 8vh auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}
.login-card h1 { text-align: center; font-size: 1.3rem; }
.login-card form { display: flex; flex-direction: column; gap: 8px; }
.login-card label { margin-top: 8px; color: var(--muted); font-size: 0.9rem; }
.login-card input {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #10141a;
  color: var(--text);
  font-size: 1rem;
}
.login-card button {
  margin-top: 20px;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: 1rem;
  cursor: pointer;
}
.aux-links { text-align: center; margin-top: 16px; font-size: 0.88rem; color: var(--muted); }

/* --- Alerts --- */
.alert { padding: 10px 12px; border-radius: 8px; font-size: 0.9rem; margin: 8px 0; }
.alert-error { background: rgba(229, 72, 77, 0.15); color: #ff8f92; white-space: pre-wrap; }
.alert-success { background: rgba(76, 175, 80, 0.15); color: #8bd68f; }

/* --- Generator: responsive two-column layout --- */
.generator {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 1fr);
  gap: 20px;
  align-items: start;
}
.form-card h1 { margin-bottom: 4px; }
.preview-card {
  position: sticky;
  top: 76px;
  text-align: center;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 0 0 16px;
  padding: 14px 16px 16px;
}
legend { padding: 0 6px; color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }

label { display: block; margin-top: 10px; color: var(--muted); font-size: 0.88rem; }
input[type="text"], input[type="email"], input[type="password"], input[type="color"],
textarea, select, input[type="file"] {
  width: 100%;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #10141a;
  color: var(--text);
  font-size: 0.95rem;
  margin-top: 4px;
}
input[type="color"] { padding: 4px; height: 42px; cursor: pointer; }
input[type="range"] { width: 100%; margin-top: 6px; }
textarea { resize: vertical; font-family: inherit; }

.field-row { display: flex; gap: 16px; flex-wrap: wrap; }
.field-row .field { flex: 1 1 160px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--text); font-size: 0.92rem; }
.checkbox-row input { width: auto; margin: 0; }
.logo-field { margin-top: 10px; }

.actions { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.btn {
  padding: 12px 18px;
  border-radius: 10px;
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.15s ease;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-secondary { background: #333c4a; color: var(--text); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-small { padding: 7px 12px; font-size: 0.85rem; }
.link-button { background: none; border: none; color: var(--muted); text-decoration: underline; cursor: pointer; font-size: 0.9rem; }

.preview-box {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  position: relative;
}
.preview-box img { max-width: 100%; height: auto; display: block; }
.preview-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.7);
  color: #333;
  font-size: 0.9rem;
  border-radius: 12px;
}

/* --- My codes --- */
.topbar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; margin-bottom: 4px; }
.codes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.code-card { text-align: center; }
.code-thumb { width: 100%; max-width: 180px; background: #fff; border-radius: 8px; padding: 8px; }
.code-card h3 { margin: 10px 0 2px; font-size: 1rem; overflow-wrap: anywhere; }
.code-actions { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; margin-top: 10px; }

/* --- Admin --- */
.admin-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
}
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.admin-table th, .admin-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.stacked-form { display: flex; flex-direction: column; gap: 4px; max-width: 420px; }
.stacked-form button { margin-top: 14px; align-self: flex-start; padding: 10px 16px; border: none; border-radius: 8px; background: var(--accent); color: #fff; cursor: pointer; }
.inline-form { display: flex; gap: 12px; flex-wrap: wrap; }
.simple-list { margin: 0; padding-left: 20px; }

/* --- Responsive breakpoints: tablet and smartphone --- */
@media (max-width: 900px) {
  .generator { grid-template-columns: 1fr; }
  .preview-card { position: static; order: -1; }
}

@media (max-width: 640px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 10px;
  }
  .nav-links.open { display: flex; }
  .card { padding: 16px; }
  .login-card { padding: 22px; margin: 4vh 8px; }
  .field-row { flex-direction: column; gap: 0; }
  .actions { flex-direction: column; }
  .actions .btn { width: 100%; }
}