:root {
  --body-backg-dark : linear-gradient(120deg, #101320 0%, #1a1a2e 100%);
  --bg-color: linear-gradient(120deg, #e0eafc 0%, #cfdef3 100%);
  --bg-color-dark: linear-gradient(120deg, #181c2e 0%, #181f42 100%);
  --text-color: #222;
  --navbar-bg: #fff;
  --card-bg: #fff;
  --card-shadow: 0 4px 24px rgba(44,62,80,0.10);
  --file-group-title-bg: linear-gradient(to right, #c3dce4 0%, #e3f0f5 100%);
  --list-group-item-bg: #f8fafd;
  --badge-bg: #fff;
  --btn-primary-bg: linear-gradient(90deg, #30b5dd 0%, #ba002b 100%);
  --btn-outline-danger-color: #ba002b;
  --btn-outline-primary-color: #30b5dd;
}

html, body {
  height: 100%;
}
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: 70px;
}
.container {
  flex: 1 0 auto;
}
body {
  background: var(--bg-color);
  font-family: "Segoe UI", sans-serif;
  /*transition: background 0.3s, color 0.3s;*/
}
body.dark-mode {
  background: linear-gradient(120deg, #232946 0%, #1a1a2e 100%);
  color: #eaeaea;
}
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: #fff;
  transition: background 0.3s, color 0.3s;
  box-shadow: 0 2px 12px rgba(44,62,80,0.10);
}
body.dark-mode .navbar {
  background: var(--bg-color-dark);
  color: #eaeaea;
}
.brand {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: #30b5dd;
  background: linear-gradient(to right, #30b5dd 0%, #ba002b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding: 0.3em 1em;
  border: 1px solid;
  border: linear-gradient(to right, #0a3d62 0%, #ba002b 100%) 1;
  border-radius: 5px;
  display: inline-block;
  box-shadow: 0 2px 12px rgba(44,62,80,0.10);
}
.main-card {
  background: #fff;
  color: #222;
  transition: background 0.3s, color 0.3s;
  border-radius: 1.2rem;
  box-shadow: 0 4px 24px rgba(44,62,80,0.10);
  padding: 2rem 2.5rem;
  margin-bottom: 2rem;
}
body.dark-mode .main-card {
  background: #232946;
  color: #eaeaea;
}
.file-group-title {
  background: linear-gradient(to right, #c3dce4 0%, #e3f0f5 100%);
  color: rgb(102, 117, 129);
  padding: .5rem 1rem;
  border-radius: .6rem;
  margin-top: 2rem;
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(44,62,80,0.07);
}
body.dark-mode .file-group-title {
  background: linear-gradient(to right, #0a3d62 0%, #17223b 100%);
  color: #fff;
}
.list-group-item {
  background: #f8fafd;
  color: #222;
  transition: background 0.3s, color 0.3s;
  border: none;
  border-radius: 1rem;
  margin-bottom: .7rem;
  box-shadow: 0 2px 8px rgba(44,62,80,0.07);
  padding: 1rem;
}
.list-group-item:hover {
  background-color: #eaf6fb;
  box-shadow: 0 6px 18px rgba(44,62,80,0.13);
  transform: translateY(-2px) scale(1.01);
}
body.dark-mode .list-group-item {
  background: var(--bg-color-dark);
  color: #eaeaea;
}
.file-icon {
  font-size: 1.7rem;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 2px #30b5dd33);
}
.badge {
  background: #fff;
  color: #222;
  transition: background 0.3s, color 0.3s;
  font-size: 0.95rem;
  border-radius: .7rem;
  padding: .4em .8em;
}
body.dark-mode .badge {
  background: #232946;
  color: #eaeaea;
}
.btn-primary {
  background: linear-gradient(90deg, #30b5dd 0%, #ba002b 100%);
  color: #fff;
  border: none;
  border-radius: .7rem;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(44,62,80,0.07);
  transition: background .2s;
}
body.dark-mode .btn-primary {
  background: linear-gradient(90deg, #0a3d62 0%, #ba002b 100%);
  color: #fff;
}
.btn-outline-danger {
  color: #ba002b;
  border-radius: 50%;
  padding: .5rem .7rem;
  font-size: 1rem;
  transition: background .2s, color .2s;
}
body.dark-mode .btn-outline-danger {
  color: #fff;
  border-color: #ba002b;
}
.btn-outline-primary {
  color: #30b5dd;
}
body.dark-mode .btn-outline-primary {
  color: #fff;
  border-color: #30b5dd;
}
.accordion-button {
  font-weight: 500;
  font-size: 1.1rem;
  border-radius: .7rem .7rem 0 0;
}
.accordion-body {
  background: #f8fafd;
  border-radius: 0 0 .7rem .7rem;
  box-shadow: 0 2px 8px rgba(44,62,80,0.07);
  transition: background 0.3s, color 0.3s;
}
body.dark-mode .accordion-body {
  background: #232946 !important;
  color: #fff !important;
}
body.dark-mode .accordion-button {
  background: #232946 !important;
  color: #fff !important;
  border-color: #232946 !important;
}
body.dark-mode .form-control {
  background: #232946 !important;
  color: #fff !important;
  border: 1px solid #30b5dd99 !important;
}
body.dark-mode .btn-primary,
body.dark-mode .btn-outline-danger,
body.dark-mode .btn-outline-primary {
  color: #fff !important;
}
body.dark-mode .text-upload-info {
  color: #fff !important;
}
body.dark-mode .upload-ext-badge {
  background: #232946 !important;
  color: #fff !important;
  border: 1px solid #30b5dd99 !important;
}
footer {
  flex-shrink: 0;
  margin-top: auto;
  padding-top: 1rem;
  font-size: 0.85rem;
  color: #6c757d;
  background: none;
  border: none;
}
body.dark-mode footer {
  color: #b0b0b0;
}
body.dark-mode a {
  color: #f5df89 !important;
}
body.dark-mode a:hover, body.dark-mode a:focus {
  color: #eeeaa9 !important;
  text-decoration: underline;
}
.github-style {
  font-family: 'Fira Mono', 'Consolas', 'Menlo', 'Monaco', monospace;
  font-size: 1.25rem;
  font-weight: 600;
  background: #d8e4f0;
  color: #292d31;
  padding: 0.25em 0.7em;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(36,41,46,0.13);
  letter-spacing: 1px;
  display: inline-block;
  border: 1px solid #444c56;
}
body.dark-mode .github-style {
  background: #161b22;
  color: #cce1f1;
  border-color: #444c56;
}
body.dark-mode .no-files-msg {
  color: #ffe066 !important;
}
@media (max-width: 576px) {
  .main-card {
    padding: 1rem .5rem;
  }
  .list-group-item .d-flex {
    flex-direction: column;
    align-items: stretch !important;
  }
  .list-group-item .text-truncate {
    max-width: 100% !important;
  }
  .badge, .btn {
    margin-top: .25rem;
  }
}