:root {
  --bg: #f0f3f7;
  --bg-accent: #e4ebf3;
  --surface: #ffffff;
  --text: #1a2332;
  --text-muted: #5a6a7e;
  --border: #d5dde8;
  --primary: #1e4d7b;
  --primary-hover: #163a5c;
  --primary-soft: #e8f1f8;
  --success: #1f7a4c;
  --success-soft: #e6f5ed;
  --warning: #9a6b12;
  --warning-soft: #fff6e0;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --shadow: 0 8px 28px rgba(26, 45, 70, 0.08);
  --radius: 12px;
  --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Code", "Consolas", "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, #d7e6f5 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, #e8eef6 0%, transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-accent) 100%);
  line-height: 1.5;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
}

.container-wide {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand img {
  width: 48px;
  height: 48px;
}

.brand-text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--primary);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
}

.hero-card {
  animation: fadeUp 0.45s ease both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1,
h2,
h3 {
  margin: 0 0 0.5rem;
  line-height: 1.25;
  color: var(--text);
}

h1 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.subtitle {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.lead {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
  max-width: 52ch;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.meta-item {
  background: var(--primary-soft);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  text-align: center;
}

.meta-item .label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.meta-item .value {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary);
}

.form-grid {
  display: grid;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

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

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 77, 123, 0.15);
}

.form-group input:disabled,
.form-group input.locked-field {
  background: #f5f7fa;
  color: var(--text);
  cursor: not-allowed;
  opacity: 1;
  color-scheme: light;
}

.datetime-locked-wrap {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 0.5rem;
}

.datetime-hint {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.checkbox-row input {
  margin-top: 0.25rem;
  width: 1.05rem;
  height: 1.05rem;
  accent-color: var(--primary);
}

.checkbox-row label {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, opacity 0.15s;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-secondary {
  background: #eef2f7;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: #e3e9f1;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background: #8f1c13;
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-block {
  width: 100%;
}

.actions {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.field-error {
  color: var(--danger);
  font-size: 0.8rem;
  min-height: 1.1em;
}

.footer-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 1.5rem 0 2rem;
}

.admin-link {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.success-panel {
  text-align: center;
  padding: 3rem 1.5rem;
  animation: fadeUp 0.4s ease both;
}

.success-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--success-soft);
  color: var(--success);
  display: grid;
  place-items: center;
  font-size: 2rem;
  margin: 0 auto 1.25rem;
  animation: popIn 0.35s ease both;
}

@keyframes popIn {
  from {
    transform: scale(0.7);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.success-panel p {
  color: var(--text-muted);
  max-width: 42ch;
  margin: 0.5rem auto;
}

.alert {
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.92rem;
}

.alert-warning {
  background: var(--warning-soft);
  color: var(--warning);
  border: 1px solid #f0d9a0;
}

.alert-danger {
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid #f5c2c0;
}

.alert-info {
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid #b9d2e8;
}

.alert-success {
  background: var(--success-soft);
  color: var(--success);
  border: 1px solid #b7e0c8;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 36, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.5rem;
  width: min(440px, 100%);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
  animation: fadeUp 0.25s ease both;
}

.modal h3 {
  margin-bottom: 0.75rem;
}

.modal p {
  color: var(--text-muted);
  margin: 0 0 0.5rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

@media (max-width: 720px) {
  .meta-grid,
  .form-row {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 1.25rem;
  }
}