/* ============================================================
   QR Code App — Minimal / Corporate / Light theme
   ============================================================ */

:root {
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-border: #dfe3e8;
  --color-text: #1f2933;
  --color-text-muted: #616e7c;
  --color-primary: #1a56db;
  --color-primary-hover: #14449e;
  --color-danger: #b91c1c;
  --color-danger-bg: #fdecec;
  --color-success: #05603a;
  --color-success-bg: #e7f7ef;
  --radius: 6px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

/* ---------- Navigation ---------- */

nav {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  max-width: 960px;
  margin: 0 auto;
  height: 56px;
}

nav ul li {
  display: flex;
}

nav ul li a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius);
}

nav ul li a:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* ---------- Layout ---------- */

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 24px;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  max-width: 480px;
  margin: 0 auto;
}

.card--wide {
  max-width: 720px;
}

h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 20px;
  color: var(--color-text);
}

h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--color-text);
}

p {
  color: var(--color-text-muted);
  font-size: 14px;
}

/* ---------- Forms ---------- */

form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: -10px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="datetime-local"] {
  font-family: var(--font);
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}

input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

label input[type="checkbox"] {
  margin-right: 8px;
}

button,
input[type="submit"] {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  padding: 10px 16px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

button:hover,
input[type="submit"]:hover {
  background-color: var(--color-primary-hover);
}

/* ---------- Flash messages ---------- */

.flash-messages {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.flash-messages li {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid rgba(185, 28, 28, 0.2);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
}

/* ---------- Table ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

th, td {
  text-align: left;
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-bg);
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

tr:last-child td {
  border-bottom: none;
}

/* ---------- QR result page ---------- */

.qr-result {
  text-align: center;
}

.qr-result img {
  max-width: 220px;
  margin: 0 auto 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px;
  background-color: var(--color-surface);
  display: block;
}

.qr-result ul {
  text-align: left;
  color: var(--color-text-muted);
  font-size: 14px;
}

.qr-result a {
  display: inline-block;
  margin-top: 16px;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.qr-result a:hover {
  text-decoration: underline;
}

select {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid #dfe3e8;
  border-radius: 6px;
  background-color: #ffffff;
  color: #1f2933;
}

.site-footer {
  margin-top: 40px;
  padding: 20px 24px;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.site-footer img {
  height: 28px;
  width: auto;
}

.site-footer span {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- Responsive ---------- */

.table-scroll {
  overflow-x: auto;
}

@media (max-width: 640px) {
  nav ul {
    height: auto;
    flex-wrap: wrap;
    padding: 8px 0;
    gap: 2px;
  }

  nav ul li a {
    padding: 8px 10px;
    font-size: 13px;
  }

  main {
    padding: 20px 16px;
  }

  .card {
    padding: 20px;
    max-width: 100%;
  }

  .card--wide {
    max-width: 100%;
  }

  h1 {
    font-size: 19px;
  }

  table {
    font-size: 13px;
  }

  th, td {
    padding: 8px 10px;
  }

  .site-footer {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
}

/* ---------- Responsive ---------- */

.table-scroll {
  overflow-x: auto;
}

@media (max-width: 640px) {
  nav ul {
    height: auto;
    flex-wrap: wrap;
    padding: 8px 0;
    gap: 2px;
  }

  nav ul li a {
    padding: 8px 10px;
    font-size: 13px;
  }

  main {
    padding: 20px 16px;
  }

  .card {
    padding: 20px;
    max-width: 100%;
  }

  .card--wide {
    max-width: 100%;
  }

  h1 {
    font-size: 19px;
  }

  table {
    font-size: 13px;
  }

  th, td {
    padding: 8px 10px;
  }

  .site-footer {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
}