:root {
  --bg-primary: #0b0f19;
  --bg-card: #151d2f;
  --bg-input: #1c263c;
  --border-color: #2a3754;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 8px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  padding-bottom: 80px;
}

/* Header & Status Bar */
.top-bar {
  background-color: #080b12;
  border-bottom: 1px solid var(--border-color);
  padding: 10px 18px;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  height: 36px;
  width: auto;
  object-fit: contain;
  background: #ffffff;
  padding: 3px 8px;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.brand {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-main);
  text-transform: uppercase;
}

.brand-sub {
  font-size: 11px;
  color: var(--text-muted);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-pill.offline {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  border-color: rgba(245, 158, 11, 0.3);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
}

/* Container */
.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 16px;
}

/* Card Sections */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.card-header {
  padding: 14px 18px;
  background: #111827;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.card-header h2 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-header .chevron {
  color: var(--text-muted);
  font-size: 12px;
  transition: transform 0.2s ease;
}

.card.collapsed .card-header .chevron {
  transform: rotate(-90deg);
}

.card.collapsed .card-body {
  display: none;
}

.card-body {
  padding: 16px 18px;
}

/* Form Controls */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.form-group {
  margin-bottom: 14px;
}

.form-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25);
}

textarea {
  min-height: 64px;
  resize: vertical;
}

/* Autosave indicator */
.autosave-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 14px;
  padding: 4px 6px;
}

/* Corner-by-corner grid */
.corner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.corner-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 12px;
}

.corner-label {
  font-size: 12px;
  font-weight: 800;
  color: #60a5fa;
  margin-bottom: 6px;
}

/* Bottom Action Bar */
.bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(8, 11, 18, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-color);
  padding: 12px 20px;
  display: flex;
  justify-content: center;
  z-index: 100;
}

.submit-btn {
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  width: 100%;
  max-width: 500px;
  transition: background-color 0.15s, transform 0.05s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.submit-btn:hover {
  background-color: var(--accent-hover);
}

.submit-btn:active {
  transform: scale(0.99);
}

.submit-btn:disabled {
  background-color: #334155;
  color: #64748b;
  cursor: not-allowed;
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

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

.modal-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  max-width: 480px;
  width: 100%;
  padding: 24px;
  text-align: center;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.modal-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-secondary {
  background-color: #1e293b;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.btn-secondary:hover {
  background-color: #334155;
}

/* Icon button */
.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
}

.btn-icon:hover {
  background-color: var(--bg-input);
}

.btn-small {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: #93c5fd;
  text-decoration: none;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 600;
}

.btn-back {
  background: #dc2626;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.btn-back:hover {
  background: #b91c1c;
}

/* Fullscreen In-App PDF Preview Overlay */
.pdf-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: #000;
  z-index: 300;
  flex-direction: column;
}

.pdf-overlay.active {
  display: flex;
}

.pdf-viewer-bar {
  background-color: #0f172a;
  border-bottom: 1px solid var(--border-color);
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.pdf-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pdf-iframe-container {
  flex: 1;
  width: 100%;
  height: 100%;
  background: #2d3748;
}

.pdf-iframe-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Tab buttons for management modal */
.tab-btn {
  background: #1e293b;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.tab-btn.active {
  background: #2563eb;
  border-color: #3b82f6;
  color: #ffffff;
}