:root {
  --bg-main: #0c0c0e;
  --bg-card: #16161a;
  --bg-card-hover: #1c1c22;
  --bg-input: #101014;
  --border-color: #27272f;
  --border-focus: #4f46e5;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.12);
  --threads-accent: #0095f6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background-color: rgba(22, 22, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.75rem 1.25rem;
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #ff007f, #7928ca, #0070f3);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(121, 40, 202, 0.35);
}

.brand-info h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-info p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Layout */
.app-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  flex: 1;
  width: 100%;
}

@media (min-width: 992px) {
  .app-container {
    grid-template-columns: 460px 1fr;
    align-items: start;
  }
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form inputs */
.form-group {
  margin-bottom: 1.1rem;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-label span.badge-tip {
  font-size: 0.7rem;
  background: var(--accent-light);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 500;
  margin-left: 6px;
}

.form-control, .form-select {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  padding: 0.7rem 0.85rem;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

textarea.form-control {
  min-height: 90px;
  resize: vertical;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: white;
  width: 100%;
  padding: 0.85rem;
  font-size: 0.95rem;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #4f46e5, #4338ca);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  background-color: var(--bg-input);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
}

.btn-sm {
  padding: 0.4rem 0.7rem;
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-sm);
}

/* Quick Hook Templates Pill Bar */
.quick-templates-bar {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 0.9rem;
  scrollbar-width: thin;
}

.template-chip {
  flex-shrink: 0;
  font-size: 0.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
}

.template-chip:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: var(--accent-light);
}

/* Threads Feed Card Mockup */
.threads-chain-container {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.threads-post-item {
  display: flex;
  gap: 0.85rem;
  position: relative;
  padding-bottom: 1.25rem;
}

.threads-post-item:not(:last-child) .threads-avatar-col::after {
  content: "";
  position: absolute;
  top: 42px;
  bottom: 0;
  left: 19px;
  width: 2px;
  background-color: var(--border-color);
}

.threads-avatar-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.threads-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
}

.threads-content-col {
  flex: 1;
  background: #141417;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.threads-post-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.author-meta {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.author-name {
  font-weight: 700;
  font-size: 0.9rem;
}

.author-badge {
  color: var(--threads-accent);
  font-size: 0.85rem;
}

.post-part-badge {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 8px;
  border-radius: 12px;
  color: var(--text-secondary);
  font-weight: 600;
}

.threads-body {
  font-size: 0.94rem;
  line-height: 1.6;
  white-space: pre-wrap;
  color: #f1f5f9;
  word-break: break-word;
  outline: none;
  min-height: 40px;
  transition: background 0.2s;
}

.threads-body:focus {
  background: rgba(255, 255, 255, 0.03);
  padding: 4px;
  border-radius: 4px;
}

.threads-footer-meta {
  margin-top: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 0.6rem;
}

.char-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.char-badge.warning {
  color: var(--warning);
}

.threads-actions {
  display: flex;
  gap: 0.4rem;
}

/* Strategy Box & First Reply */
.strategy-box {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(121, 40, 202, 0.08));
  border: 1px dashed rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  margin-top: 1rem;
}

.strategy-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #818cf8;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
}

.strategy-desc {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.first-reply-card {
  background: #111114;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin-top: 0.75rem;
}

/* History List */
.history-item {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  margin-bottom: 0.65rem;
  cursor: pointer;
  transition: all 0.2s;
}

.history-item:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent);
}

.history-item.active {
  border-color: var(--accent);
  background: var(--accent-light);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}

.history-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

.history-preview {
  font-size: 0.78rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.history-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s;
  padding: 1rem;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: #1e1e24;
  color: #fff;
  padding: 0.75rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 20px rgba(0,0,0,0.4);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideIn 0.3s ease forwards;
}

@keyframes slideIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Loading Spinner */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

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

.tag-badge {
  display: inline-block;
  background: rgba(0, 149, 246, 0.15);
  color: var(--threads-accent);
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 600;
}