:root {
  --bg: #eef2f6;
  --panel: #ffffff;
  --ink: #10202b;
  --muted: #4f6474;
  --brand: #0f5d78;
  --brand-strong: #0a4660;
  --danger: #9a2b2b;
  --border: #d4dde4;
  --shadow: 0 14px 30px rgba(15, 41, 59, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Source Sans 3", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(145deg, #f8fbff, #e8edf2 50%, #dbe5ed);
  position: relative;
}

.background-glow {
  position: fixed;
  inset: -25% auto auto -15%;
  width: 46rem;
  height: 46rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 93, 120, 0.15), rgba(15, 93, 120, 0));
  pointer-events: none;
}

.site-header {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

.site-header h1 {
  margin: 0;
  font-family: "Bitter", Georgia, serif;
  letter-spacing: 0.03em;
  font-size: clamp(1.6rem, 2.6vw, 2.4rem);
}

.site-header p {
  margin: 0.6rem 0 0;
  color: var(--muted);
}

.layout {
  width: min(1160px, 100% - 2rem);
  margin: 0 auto 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

h2 {
  margin: 0;
  font-family: "Bitter", Georgia, serif;
}

.hint {
  margin: 0.3rem 0 0.9rem;
  color: var(--muted);
}

.groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.group-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem;
  background: #fcfdff;
}

.group-title {
  margin: 0 0 0.6rem;
}

.documents {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.document-item {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.document-item a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
}

.document-item a:hover {
  text-decoration: underline;
}

.stack {
  display: grid;
  gap: 0.6rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.92rem;
}

input {
  width: 100%;
  padding: 0.52rem 0.58rem;
  border: 1px solid #b9c7d1;
  border-radius: 8px;
  font: inherit;
}

.inline-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 9px;
  padding: 0.54rem 0.75rem;
  background: var(--brand);
  color: #fff;
  display: inline-block;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
}

.btn:hover {
  background: var(--brand-strong);
}

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

.btn-secondary {
  background: #426173;
}

.btn-google {
  background: #ffffff;
  color: #1f1f1f;
  border: 1px solid #cfd7de;
}

.btn-google:hover {
  background: #f4f7fa;
}

.btn-small {
  padding: 0.4rem 0.65rem;
  font-size: 0.88rem;
}

.group-admin-header,
.admin-document-item {
  cursor: grab;
}

.group-admin-header:active,
.admin-document-item:active {
  cursor: grabbing;
}

.group-admin-header input,
.admin-document-item input {
  cursor: text;
}

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

.status {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.group-admin-header {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin-bottom: 0.7rem;
}

.admin-document-item {
  border: 1px solid var(--border);
  padding: 0.55rem;
  border-radius: 8px;
  background: #fff;
}

.admin-card.is-dragging,
.admin-document-item.is-dragging {
  opacity: 0.55;
}

.hidden {
  display: none;
}

.empty-state {
  margin: 0;
  color: var(--muted);
  font-style: italic;
}

@media (min-width: 760px) {
  .layout {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }

  .layout > :only-child {
    grid-column: 1 / -1;
  }

  .admin-panel {
    grid-column: 1 / -1;
  }

  .inline-form {
    grid-template-columns: 1.2fr 1.6fr auto;
    align-items: center;
  }

  #addGroupForm {
    grid-template-columns: 1fr auto;
  }

  .group-admin-header {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .admin-document-item {
    grid-template-columns: 1fr 1.6fr auto;
    display: grid;
    align-items: center;
  }
}

.top-banner {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  backdrop-filter: saturate(130%) blur(8px);
  background: rgba(247, 251, 255, 0.9);
  border-bottom: 1px solid rgba(16, 32, 43, 0.12);
}

.banner-inner {
  width: min(1160px, 100% - 2rem);
  margin: 0 auto;
  min-height: 4.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.brand-logo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: contain;
  box-shadow: 0 4px 10px rgba(15, 41, 59, 0.15);
  flex-shrink: 0;
}

.brand-name {
  font-family: "Bitter", Georgia, serif;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
}

.btn-admin {
  padding: 0.38rem 0.7rem;
  line-height: 1.2;
}

.page-shell {
  width: min(1160px, 100% - 2rem);
  margin: 0 auto 2rem;
  padding-top: 5.4rem;
}

.hero {
  padding: 1.35rem 1.25rem;
  margin-bottom: 1rem;
  border-radius: 14px;
  border: 1px solid rgba(16, 32, 43, 0.14);
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.85), rgba(235, 243, 251, 0.9));
  box-shadow: var(--shadow);
  animation: riseIn 420ms ease-out both;
}

.hero-kicker {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--brand-strong);
  font-weight: 700;
}

.hero h1 {
  margin: 0.25rem 0 0;
  font-family: "Bitter", Georgia, serif;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
}

.hero-subtitle {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

.page-shell .layout {
  width: 100%;
  margin: 0;
}

.site-footer {
  width: min(1160px, 100% - 2rem);
  margin: 0 auto 1.25rem;
  padding: 0.95rem 0.75rem 0;
  border-top: 1px solid rgba(16, 32, 43, 0.15);
}

.site-footer p {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.93rem;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 740px) {
  .banner-inner {
    min-height: 3.8rem;
  }

  .brand-name {
    display: none;
  }

  .brand-logo {
    width: 46px;
    height: 46px;
  }

  .page-shell {
    padding-top: 5rem;
  }

  .hero {
    padding: 1.1rem 0.95rem;
  }
}