*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-border: #d1d1d6;
  --color-text: #1d1d1f;
  --color-text-muted: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-error: #c0392b;
  --color-error-bg: #fdf0ef;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.05);
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

/* ── Layout ──────────────────────────────────────────────── */

header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

header nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

header nav a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

header nav a:hover {
  color: var(--color-accent);
}

main {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* ── Card ────────────────────────────────────────────────── */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

/* ── Typography ──────────────────────────────────────────── */

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

/* ── Forms ───────────────────────────────────────────────── */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.18);
}

/* ── Buttons ─────────────────────────────────────────────── */

button,
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
  text-decoration: none;
}

button[type="submit"],
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

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

.btn-secondary {
  background: var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  opacity: 0.8;
}

/* ── Alerts ──────────────────────────────────────────────── */

.alert-error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  color: var(--color-error);
  border-radius: 8px;
  padding: 0.65rem 1rem;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* ── Tables ──────────────────────────────────────────────── */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead tr {
  border-bottom: 2px solid var(--color-border);
}

th {
  text-align: left;
  font-weight: 600;
  padding: 0.5rem 0.75rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

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

tbody tr:hover td {
  background: var(--color-bg);
}

tr.clickable-row {
  cursor: pointer;
}

.id-cell {
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

/* ── Details page ────────────────────────────────────────── */

.back-link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-accent);
  text-decoration: none;
  margin-bottom: 0.75rem;
}

.back-link:hover {
  text-decoration: underline;
}

.details-header {
  margin-bottom: 1.5rem;
}

.details-header h1 {
  margin-bottom: 0.35rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.version-badge {
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--color-border);
  color: var(--color-text-muted);
  border-radius: 20px;
  padding: 0.15rem 0.6rem;
}

.meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
}

.sep {
  color: var(--color-border);
}

.response-card {
  margin-bottom: 1rem;
}

.contact-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-weight: 500;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.contact-row a {
  color: var(--color-accent);
  text-decoration: none;
}

.answer-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1rem;
  padding: 0.35rem 0;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-bg);
}

.answer-row:last-child {
  border-bottom: none;
}

.answer-key {
  color: var(--color-text-muted);
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  padding-top: 0.1rem;
}

.answer-question {
  font-size: 0.875rem;
  color: var(--color-text);
  padding-top: 0.1rem;
}

.response-title-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.35rem;
}

.response-title-row h1 {
  margin-bottom: 0;
}

.muted {
  color: var(--color-text-muted);
}

/* ── Navbar sign-out ─────────────────────────────────────── */

.signout-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.signout-btn:hover {
  color: var(--color-text);
  background: var(--color-bg);
}

/* ── Login page ──────────────────────────────────────────── */

.login-wrapper {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  padding: 1.5rem;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2.5rem 2rem;
}

.login-card h1 {
  font-size: 1.5rem;
  text-align: center;
  margin-bottom: 1.75rem;
}

.login-card button[type="submit"] {
  width: 100%;
  justify-content: center;
  margin-top: 0.5rem;
  padding: 0.65rem;
}