:root {
  --primary-color: #0055a5;
  --primary-dark: #003b7b;
  --secondary-color: #ff6f91;
  --tertiary-color: #00c9a7;
  --accent-color: #ffd166;
  --background-color: #f5f7ff;
  --card-overlay: rgba(255, 255, 255, 0.88);
  --text-muted: #6c757d;
}

* {
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

body {
  position: relative;
  background: radial-gradient(120% 120% at 10% 10%, rgba(0, 201, 167, 0.25) 0%, transparent 45%),
    radial-gradient(120% 120% at 90% 20%, rgba(255, 111, 145, 0.2) 0%, transparent 50%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(240, 244, 255, 0.92) 100%),
    url("https://images.unsplash.com/photo-1503676260728-1c00da094a0b?auto=format&fit=crop&w=1500&q=80");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(40% 40% at 0% 100%, rgba(0, 85, 165, 0.25), transparent),
    radial-gradient(30% 30% at 100% 100%, rgba(255, 209, 102, 0.18), transparent);
  pointer-events: none;
  z-index: -1;
}

.navbar {
  background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
  box-shadow: 0 1.25rem 2.5rem rgba(0, 59, 123, 0.18);
}

.navbar-brand {
  font-weight: 700;
  background: linear-gradient(120deg, #ffffff 0%, var(--accent-color) 100%);
  -webkit-background-clip: text;
  color: transparent;
}

.navbar-nav .nav-link {
  position: relative;
  color: rgba(255, 255, 255, 0.84) !important;
  font-weight: 500;
  margin-inline: 0.35rem;
}

.navbar-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0.3rem;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--secondary-color), var(--tertiary-color));
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link:focus {
  color: #ffffff !important;
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link:focus::after,
.navbar-nav .nav-link.active::after {
  opacity: 1;
  transform: translateY(0);
}

.navbar-nav .nav-link.active {
  color: #ffffff !important;
}


.nav-signout {
  border-width: 2px;
  font-weight: 600;
  border-radius: 999px;
  padding-inline: 1.5rem;
  margin-top: 0.5rem;
}

.nav-signout:hover,
.nav-signout:focus {
  color: #1f2a44 !important;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  border-color: transparent;
}

.back-link {
  border-radius: 999px;
  font-weight: 500;
  padding-inline: 1.25rem;
}

.back-link:hover,
.back-link:focus {
  border-color: transparent;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  color: #1f2a44;
}

.paper-table th {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: #54617a;
}

.paper-table td {
  vertical-align: middle;
}

.paper-title-link {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
}

.paper-title-link:hover,
.paper-title-link:focus {
  text-decoration: underline;
  color: var(--secondary-color);
}

@media (min-width: 992px) {
  .nav-signout {
    margin-top: 0;
    width: auto !important;
  }
}

.btn-primary,
.btn-outline-primary {
  font-weight: 600;
  border-radius: 999px;
  padding-inline: 1.75rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  border-color: transparent;
  box-shadow: 0 0.75rem 1.5rem rgba(0, 59, 123, 0.25);
}

.btn-outline-primary {
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-primary:hover,
.btn-outline-primary:hover {
  border-color: transparent;
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  color: #1f2a44;
  transform: translateY(-2px);
  box-shadow: 0 1.25rem 2.5rem rgba(255, 111, 145, 0.28);
}

.page-title h1 {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(120deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  color: transparent;
}

.page-title p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.feature-card,
.card {
  position: relative;
  border-radius: 1rem;
  padding: 1.85rem;
  background: var(--card-overlay);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 1.5rem 2.5rem rgba(31, 42, 68, 0.1);
  overflow: hidden;
}

.feature-card::before,
.card::before {
  content: "";
  position: absolute;
  inset: -40% 20% 60%;
  background: radial-gradient(circle at top right, rgba(255, 111, 145, 0.35), transparent 60%);
  transform: rotate(12deg);
  opacity: 0.7;
  pointer-events: none;
}

.feature-card--teal::before,
.card.gradient-teal::before {
  background: radial-gradient(circle at top right, rgba(0, 201, 167, 0.38), transparent 60%);
}

.feature-card--gold::before,
.card.gradient-gold::before {
  background: radial-gradient(circle at top right, rgba(255, 209, 102, 0.36), transparent 60%);
}

.feature-card h2 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
  color: #1f2a44;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 2.5rem 3.5rem rgba(0, 59, 123, 0.15);
}

.card {
  backdrop-filter: blur(16px);
}

.list-group-item {
  background: rgba(255, 255, 255, 0.75);
  border: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.list-group-item:last-child {
  border-bottom: none;
}

.paper-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

a:hover,
a:focus {
  color: var(--secondary-color);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 0.2rem rgba(255, 111, 145, 0.2);
}

.badge.bg-info {
  background: linear-gradient(135deg, var(--tertiary-color), var(--secondary-color));
  color: #0f2542;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-weight: 600;
}

.alert {
  border: none;
  border-radius: 0.85rem;
  backdrop-filter: blur(8px);
}

.alert-info {
  background: rgba(0, 146, 255, 0.1);
  color: #004a7c;
}

.alert-warning {
  background: rgba(255, 209, 102, 0.2);
  color: #8a5b00;
}

.alert-danger {
  background: rgba(255, 111, 145, 0.18);
  color: #6b1232;
}

.alert-success {
  background: rgba(0, 201, 167, 0.18);
  color: #0d5247;
}

footer {
  background: linear-gradient(90deg, rgba(31, 42, 68, 0.96), rgba(0, 59, 123, 0.9));
  box-shadow: 0 -0.75rem 1.5rem rgba(0, 59, 123, 0.25);
}

@media (max-width: 576px) {
  body {
    background-attachment: scroll;
  }

  .feature-card {
    text-align: center;
  }
}
.feature-card--pink::before {
  background: radial-gradient(circle at top right, rgba(255, 111, 145, 0.35), transparent 60%);
}

.pdf-preview iframe {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 0.75rem;
}

.preview-hero {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .preview-hero {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.preview-hero__text {
  max-width: 60rem;
}

.preview-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: #1f2a44;
  margin-bottom: 0.25rem;
}

.preview-subtitle {
  margin: 0;
  color: #6c757d;
  font-size: 1rem;
}

.preview-hero__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.metadata-card dl {
  margin-bottom: 0;
}

.metadata-card dt {
  font-weight: 600;
  color: #54617a;
}

.pdf-card .card-header {
  background: rgba(0, 85, 165, 0.05);
  font-weight: 600;
}

.pdf-preview {
  border-radius: 0.75rem;
  overflow: hidden;
}

.pdf-preview iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #f8f9fa;
}