:root {
  --primary-color: #6a1b91;
  --primary-hover: #5a1781;
  --primary-light: rgba(106, 27, 145, 0.08);
  --primary-shadow: rgba(106, 27, 145, 0.15);

  --secondary-color: #000000;
  --secondary-light: #1f1f1f;

  --text-color: #1c1c1c;
  --text-on-dark: #ffffff;
  --text-muted: #6c757d;

  --surface: #ffffff;
  --surface-alt: #f8f9fa;
  --surface-hover: #e2e6ea;

  --border-color: #dee2e6;
  --border-color-dark: #ddd;

  --danger-color: #dc3545;
  --danger-light: #f8d7da;
  --success-color: #198754;

  --border-radius: 12px;
  --border-radius-sm: 6px;
  --border-radius-lg: 14px;

  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-strong: 0 10px 22px rgba(0, 0, 0, 0.14);

  --z-dropdown: 1000;
  --z-sticky: 50;
  --z-modal: 100;
  --z-tooltip: 200;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

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

body {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  padding-top: 80px;
  padding-bottom: 90px;  /* Space for fixed bottom-bar */
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text-color);
  background: #f6f7f9;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
}

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

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

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

.logo {
  background-color: var(--secondary-color);
  border-bottom: 3px solid var(--primary-color);
  padding: 0.3rem 0;
  box-shadow: var(--shadow-medium);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
}

.logo img {
  max-width: 210px;
  height: auto;
}

.navbar {
  background-color: var(--secondary-color) !important;
  border-bottom: 1px solid var(--primary-color);
}

.navbar-brand,
.navbar-nav .nav-link {
  color: var(--text-on-dark) !important;
}

#main-content {
  margin-top: 1rem;
}


.btn {
  border-radius: var(--border-radius);
  font-weight: 600;
  letter-spacing: 0.01em;
  min-height: 44px;
  padding: 0.55rem 1rem;
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary,
.btn-success {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--text-on-dark);
}

.btn-primary:hover,
.btn-success:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.btn-primary:active,
.btn-success:active {
  transform: translateY(0);
}

.btn-outline-primary {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: var(--text-on-dark);
}

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

.btn-outline-secondary {
  background-color: transparent;
  border: 2px solid var(--secondary-light);
  color: var(--secondary-light);
}

.btn-outline-secondary:hover {
  background-color: var(--secondary-light);
  color: var(--text-on-dark);
}

.btn-outline-danger {
  background-color: transparent;
  border: 2px solid var(--danger-color);
  color: var(--danger-color);
}

.btn-outline-danger:hover {
  background-color: var(--danger-color);
  color: var(--text-on-dark);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}


.form-control,
.form-select {
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  padding: 0.55rem 0.75rem;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-shadow);
  outline: none;
}

.form-check-input:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}


.card {
  border-radius: var(--border-radius);
  border: none;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.card-header {
  background-color: var(--surface);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  font-weight: 600;
  padding: 0.85rem 1rem;
}

.card-body {
  background-color: var(--surface);
  padding: 1rem;
}


.alert {
  border-radius: var(--border-radius);
  border: none;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.alert-success {
  background-color: rgba(25, 135, 84, 0.1);
  color: var(--success-color);
  border-left: 4px solid var(--success-color);
}

.alert-info {
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-left: 4px solid var(--primary-color);
}

.alert-secondary {
  background-color: var(--surface-alt);
  color: var(--text-color);
  border-left: 4px solid var(--primary-color);
}


.section-title {
  background-color: var(--secondary-color);
  color: var(--text-on-dark);
  padding: 0.85rem 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1.75rem;
  box-shadow: 0 4px 0 var(--primary-color);
  font-weight: 600;
}

.section-title h2 {
  font-size: clamp(1.2rem, 2.3vw, 1.55rem);
  margin: 0;
}

@media (max-width: 768px) {
  .section-title {
    display: none !important;
  }
}

.breadcrumb-steps {
  --bs-breadcrumb-divider: '';
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 0.6rem;
  padding-left: 0;
  margin: 0.45rem 0 0.1rem;
  list-style: none;
}

.breadcrumb-steps .breadcrumb-item {
  background-color: var(--surface-alt);
  border-radius: var(--border-radius);
  padding: 0.65rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  text-align: center;
  min-height: 2.75rem;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

.breadcrumb-steps .breadcrumb-item.active {
  background-color: var(--primary-color);
  color: var(--text-on-dark);
  box-shadow: 0 5px 14px var(--primary-shadow);
  font-weight: 700;
}

.breadcrumb-steps .badge {
  font-size: 0.75rem;
  min-width: 2.1rem;
  min-height: 2.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background-color: var(--primary-color);
  color: var(--text-on-dark);
}

.breadcrumb-steps .breadcrumb-item.active .badge {
  background-color: var(--text-on-dark);
  color: var(--primary-color);
}

.progress-slider-wrapper {
  margin: 0.45rem 0 0.1rem;
  position: relative;
  border-bottom: 0.1px solid var(--primary-color);
}

.progress-slider {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 0.6rem;
  padding-left: 0;
  list-style: none;
}

.progress-slide {
  background-color: var(--surface-alt);
  border-radius: var(--border-radius);
  padding: 0.65rem 0.85rem;
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

.progress-slide.active {
  background-color: var(--primary-color);
  color: var(--text-on-dark);
  font-weight: 700;
}

.progress-slide .badge {
  font-size: 0.75rem;
  min-width: 2.1rem;
  min-height: 2.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background-color: var(--primary-color);
  color: var(--text-on-dark);
}

.progress-slide.active .badge {
  background-color: var(--text-on-dark);
  color: var(--primary-color);
}


.uploads-status {
  display: flex;
  gap: 12px;
  padding: 12px;
  border-radius: var(--border-radius-lg);
  background: var(--primary-light);
  border: 1px solid var(--primary-shadow);
  box-shadow: var(--shadow-soft);
}

.uploads-status__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(106, 27, 145, 0.18);
  color: var(--primary-color);
  flex-shrink: 0;
}

.uploads-status__content {
  flex: 1;
}

.uploads-status__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.uploads-status__btn {
  border-radius: var(--border-radius);
  padding: 10px 12px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.uploads-status__btn--primary {
  background: var(--primary-color);
  color: var(--text-on-dark);
}

.uploads-status__btn--primary:hover {
  background: var(--primary-hover);
}

.uploads-status__btn--danger {
  background: transparent;
  border: 1px solid var(--danger-color);
  color: var(--danger-color);
}

.uploads-status__btn--danger:hover {
  background: var(--danger-color);
  color: var(--text-on-dark);
}

#session-uploaded-alert {
  padding: 0.5rem 0.75rem;
  line-height: 1.3;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#session-uploaded-alert #reset-uploads-btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
  min-height: auto;
}


@media (max-width: 768px) {
  body {
    padding-top: 70px;
  }

  .logo img {
    max-width: 180px;
  }

  .card {
    box-shadow: var(--shadow-medium);
  }

  .breadcrumb-steps,
  .progress-slider {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.5rem;
    padding-bottom: 0.3rem;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .breadcrumb-steps::-webkit-scrollbar,
  .progress-slider::-webkit-scrollbar {
    display: none;
  }

  .breadcrumb-steps .breadcrumb-item,
  .progress-slide {
    flex: 0 0 auto;
    min-width: 140px;
    scroll-snap-align: start;
  }

  .progress-slider-wrapper {
    overflow: hidden;
  }

  .progress-slider {
    padding: 6px 12px;
    mask-image: linear-gradient(
            90deg,
            transparent 0px,
            #000 18px,
            #000 calc(100% - 18px),
            transparent 100%
    );
    -webkit-mask-image: linear-gradient(
            90deg,
            transparent 0px,
            #000 18px,
            #000 calc(100% - 18px),
            transparent 100%
    );
  }

  .progress-slider-wrapper::before,
  .progress-slider-wrapper::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    width: 18px;
    pointer-events: none;
    z-index: 2;
  }

  .progress-slider-wrapper::before {
    left: 0;
    background: linear-gradient(90deg, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0));
  }

  .progress-slider-wrapper::after {
    right: 0;
    background: linear-gradient(270deg, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0));
  }

  .uploads-status {
    flex-direction: column;
  }

  .uploads-status__actions {
    flex-direction: row;
  }
}


@media (max-width: 576px) {
  body {
    padding-top: 60px;
    font-size: 0.9rem;
  }

  .logo img {
    max-width: 160px;
  }

  .section-title {
    margin-bottom: 0.85rem;
    padding: 0.6rem 0.75rem;
  }

  .btn {
    font-size: 0.9rem;
    padding: 0.5rem 0.85rem;
  }
}

@media (min-width: 768px) {
  .uploads-status {
    align-items: center;
  }

  .uploads-status__actions {
    flex-direction: row;
  }

  .progress-slider {
    overflow: visible;
  }
}

@media print {
  .logo,
  .navbar,
  .breadcrumb-steps,
  .progress-slider-wrapper,
  .btn,
  footer {
    display: none !important;
  }

  body {
    padding-top: 0;
    background: white;
  }
}

.theme-selection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.theme-card {
  background: var(--surface);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 2px solid var(--border-color);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow-soft);
}

.theme-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: var(--primary-color);
}

.theme-card.selected {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px var(--primary-shadow), var(--shadow-strong);
  transform: scale(1.02);
}

.theme-card-image {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  display: block;
}

.theme-card-body {
  padding: 1rem;
  text-align: center;
}

.theme-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-color);
  margin: 0;
}

.theme-card-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

@media (max-width: 768px) {
  .theme-selection-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
  }
}

@media (max-width: 576px) {
  .theme-selection-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .theme-card-image {
    aspect-ratio: 16 / 9;
  }
}

@media (max-width: 1199.98px) {
  footer {
    display: none !important;
  }

  #cover-form {
    margin-bottom: 0 !important;
    padding-bottom: 0 !important;
  }

  .mobile-page-preview-wrapper {
    margin-bottom: 0 !important;
  }

  .bottom-bar {
    position: fixed;
    bottom: 0;
    background: linear-gradient(
            to top,
            rgba(0, 0, 0, 0.88) 0%,
            rgba(0, 0, 0, 0.82) 100%
    );
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0.85rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.22);
    z-index: 1030;
  }

  body {
    padding-bottom: 0 !important;
  }
}