/* Modern CSS Reset & Variables */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-logo: 'Outfit', sans-serif;
  
  /* Color Palette - Premium Slate & Emerald */
  --bg-dark: #0b0f19;
  --card-bg: rgba(17, 24, 39, 0.65);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.15);
  
  --success: #10b981;
  --success-hover: #059669;
  --success-glow: rgba(16, 185, 129, 0.15);
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  
  --input-bg: rgba(15, 23, 42, 0.6);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus: #6366f1;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* Background Blobs (Premium Design Aesthetic) */
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  z-index: -1;
  opacity: 0.25;
  pointer-events: none;
}

.blob-1 {
  width: 400px;
  height: 400px;
  background: var(--primary);
  top: -100px;
  right: -50px;
  animation: float-blob 20s infinite alternate;
}

.blob-2 {
  width: 500px;
  height: 500px;
  background: var(--success);
  bottom: -150px;
  left: -100px;
  animation: float-blob 25s infinite alternate-reverse;
}

.blob-3 {
  width: 300px;
  height: 300px;
  background: #ec4899;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.1;
}

@keyframes float-blob {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(50px, 40px) scale(1.1); }
}

/* Container */
.container {
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* Logo & Header */
.hero-header {
  text-align: center;
  margin-bottom: 40px;
}

.logo-text {
  font-family: var(--font-logo);
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: inline-block;
}

.logo-text span {
  background: linear-gradient(135deg, var(--primary), var(--success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  font-weight: 300;
}

/* Glass Card */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 580px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card.board-card {
  max-width: 960px;
  padding: 32px;
}

.card-title {
  font-family: var(--font-logo);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.text-center {
  text-align: center;
}

/* Forms */
.main-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.tooltip-trigger {
  cursor: help;
  font-size: 0.85rem;
  opacity: 0.7;
}

input[type="text"],
input[type="password"],
input[type="date"] {
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

input:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Password Input with Toggle Button */
.password-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.password-input-wrapper input {
  padding-right: 48px;
}

.toggle-password-btn {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition-fast);
}

.toggle-password-btn:hover {
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 0 16px var(--primary-glow);
}

.btn-success {
  background-color: var(--success);
  color: white;
}

.btn-success:hover {
  background-color: var(--success-hover);
  box-shadow: 0 0 16px var(--success-glow);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  font-size: 0.85rem;
  padding: 6px 12px;
}

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

.btn-text-only {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px;
}

.btn-text-only:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

/* Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

/* Success Card Styling */
.success-icon-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}

.success-icon {
  font-size: 3rem;
  background: var(--success-glow);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--success);
}

.success-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.share-box {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.share-box input {
  flex: 1;
}

.card-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Board Header Styles */
.board-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 20px;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.board-info {
  flex: 1;
  min-width: 250px;
}

.board-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 4px;
}

.board-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

/* Board View Layout Grid */
.board-grid-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 900px) {
  .board-grid-layout {
    grid-template-columns: 2.2fr 1fr;
  }
}

/* Calendar Section styling */
.calendar-section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Calendar Layout Structure (Grid) */
.calendar-container {
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 16px;
  overflow-x: auto;
}

.calendar-days-header {
  display: grid;
  grid-template-columns: repeat(7, minmax(80px, 1fr));
  gap: 8px;
  text-align: center;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(80px, 1fr));
  gap: 8px;
}

/* Calendar Day Cell Base */
.calendar-cell {
  background: rgba(30, 41, 59, 0.3);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  aspect-ratio: 1 / 1.1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  transition: all var(--transition-fast);
}

.calendar-cell.empty {
  background: none;
  border-color: transparent;
  pointer-events: none;
}

.calendar-cell-num {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 4px 6px;
  z-index: 2;
  pointer-events: none;
}

.calendar-cell.today {
  border-color: rgba(99, 102, 241, 0.4);
}
.calendar-cell.today .calendar-cell-num {
  color: var(--primary);
}

/* Input Calendar Day Slots (Toggles) */
.calendar-slots {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 2px;
  padding: 2px 4px 4px 4px;
}

.slot-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 4px;
  border: none;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.slot-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
}

.slot-toggle.active {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 2px 4px rgba(99, 102, 241, 0.3);
}

/* Heatmap Calendar Styling */
.heatmap-slots {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 2px;
  padding: 2px 4px 4px 4px;
}

.heatmap-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
  position: relative;
  cursor: pointer;
  border: 1px solid transparent;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.heatmap-slot.active {
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
  border-color: rgba(255, 255, 255, 0.1);
}

.heatmap-slot:hover {
  transform: scale(1.03);
  z-index: 10;
  border-color: rgba(255, 255, 255, 0.3);
}

/* Custom Tooltip on Hover */
.tooltip-data {
  position: absolute;
  bottom: 110%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #0f172a;
  border: 1px solid var(--card-border);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.75rem;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 100;
  text-transform: none;
  font-weight: normal;
}

.tooltip-data::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: #0f172a transparent transparent transparent;
}

.heatmap-slot:hover .tooltip-data {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* Sidebar Respondents Panel */
.respondents-panel {
  background: rgba(30, 41, 59, 0.2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-self: flex-start;
  width: 100%;
}

.respondents-count {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.respondents-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 350px;
  overflow-y: auto;
  padding-right: 4px;
}

.respondent-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.respondent-item:hover {
  background: rgba(255, 255, 255, 0.06);
}

.respondent-name {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 8px;
}

.respondent-actions {
  display: flex;
  gap: 6px;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.respondent-item:hover .respondent-actions {
  opacity: 1;
}

.respondent-action-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.respondent-action-btn:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.respondent-action-btn.edit:hover {
  color: var(--primary);
}

.respondent-action-btn.delete:hover {
  color: var(--danger);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 24px 0;
  font-size: 0.9rem;
}

/* Modals & Overlays (Password screen, Delete confirmations) */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.modal-card {
  max-width: 440px;
  width: 100%;
  animation: modal-enter 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modal-enter {
  from { transform: scale(0.9) translateY(10px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-header {
  margin-bottom: 20px;
  text-align: center;
}

.modal-title {
  font-family: var(--font-logo);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 8px;
}

.modal-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 10px;
  text-align: center;
}

/* Action forms / editor controls */
.editor-controls {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 16px;
}

.editor-info-banner {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Footer styling */
.main-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--card-border);
  margin-top: 40px;
}

/* Scrollbar customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}