/* ==============================================
   COMPONENTS — THE СВЯЗКИ MATRIX
   Reusable UI components
   ============================================== */

/* ── Glass Card ── */
.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}

.glass-card:hover {
  border-color: var(--color-border-glow);
}

.glass-card.active {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.glass-card.locked {
  opacity: 0.4;
  pointer-events: none;
  filter: grayscale(0.5);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-bold);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #000;
  box-shadow: var(--shadow-glow-sm);
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 50px rgba(204, 255, 0, 0.4);
}

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

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--fs-sm);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--fs-md);
}

/* ── Progress Bar ── */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), #D4FF33);
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.progress-bar__fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ── Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-xp {
  background: var(--color-primary-dim);
  color: var(--color-primary);
}

.badge-level {
  background: rgba(204, 255, 0, 0.10);
  color: var(--color-primary);
}

.badge-locked {
  background: var(--color-locked);
  color: var(--color-text-muted);
}

.badge-complete {
  background: var(--color-success-dim);
  color: var(--color-success);
}

/* ── Island Node ── */
.island-node {
  position: relative;
  padding: var(--space-xl);
  cursor: pointer;
}

.island-node__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  margin: 0 auto var(--space-md);
  transition: all var(--transition-base);
}

.island-node.active .island-node__icon {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  background: var(--color-primary-dim);
  animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(204, 255, 0, 0.2); }
  50%      { box-shadow: 0 0 40px rgba(204, 255, 0, 0.4); }
}

.island-node.completed .island-node__icon {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #000;
}

.island-node__title {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-xs);
}

.island-node__subtitle {
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  text-align: center;
}

.island-node.locked .island-node__icon {
  border-color: var(--color-locked);
  background: transparent;
  opacity: 0.3;
}

.island-node.locked .island-node__title,
.island-node.locked .island-node__subtitle {
  opacity: 0.3;
}

/* ── Path Connector ── */
.path-connector {
  width: 2px;
  height: 60px;
  margin: 0 auto;
  position: relative;
  overflow: visible;
}

.path-connector__line {
  width: 100%;
  height: 100%;
  background: var(--color-border);
  border-radius: 1px;
}

.path-connector.active .path-connector__line {
  background: linear-gradient(180deg, var(--color-primary), var(--color-primary-glow));
  box-shadow: 0 0 8px var(--color-primary-glow);
}

.path-connector__dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 12px var(--color-primary-glow);
  display: none;
}

.path-connector.active .path-connector__dot {
  display: block;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50%      { transform: translate(-50%, -50%) scale(1.5); opacity: 0.5; }
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

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

.modal {
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  z-index: var(--z-modal);
  padding: var(--space-2xl);
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary-dim) transparent;
}

.modal::-webkit-scrollbar {
  width: 6px;
}

.modal::-webkit-scrollbar-thumb {
  background: var(--color-primary-dim);
  border-radius: 3px;
}

.modal__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-text-dim);
  font-size: var(--fs-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}

.modal__close:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}

.modal__title {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.modal__subtitle {
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  margin-bottom: var(--space-xl);
}

/* ── Flip Card ── */
.flip-card {
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.flip-card:active {
  transform: scale(0.98);
}

.flip-card__inner {
  position: relative;
  width: 100%;
}

.flip-card__front,
.flip-card__back {
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 80px;
}

.flip-card__front {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  cursor: pointer;
  transition: border-color var(--transition-base);
}

.flip-card:hover .flip-card__front {
  border-color: rgba(204, 255, 0, 0.30);
}

/* When not flipped, back is hidden behind front */
.flip-card__back {
  display: none;
  background: rgba(204, 255, 0, 0.12);
  border: 1px solid rgba(204, 255, 0, 0.40);
  color: var(--color-text);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

/* When flipped, show back and hide front */
.flip-card.flipped .flip-card__front {
  display: none;
}

.flip-card.flipped .flip-card__back {
  display: flex;
}

.flip-card__label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.flip-card__text {
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--color-text);
}

.flip-card__back .flip-card__text {
  color: var(--color-text);
  font-size: var(--fs-sm);
}

/* ── Category Card ── */
.category-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.category-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.category-card__header:hover {
  border-color: rgba(204, 255, 0, 0.40);
}

.category-card.expanded .category-card__header {
  border-color: rgba(204, 255, 0, 0.30);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.category-card__emoji {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.category-card__name {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  flex: 1;
}

.category-card__arrow {
  color: var(--color-text-muted);
  transition: transform var(--transition-base);
  font-size: var(--fs-sm);
}

.category-card.expanded .category-card__arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.category-card__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.category-card.expanded .category-card__body {
  max-height: 200px;
}

.category-card__content {
  padding: var(--space-lg);
  background: rgba(204, 255, 0, 0.05);
  border: 1px solid rgba(204, 255, 0, 0.20);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--color-text-dim);
}

.category-card__check {
  display: none;
  color: var(--color-primary);
  font-size: var(--fs-md);
}

.category-card.expanded .category-card__check {
  display: block;
}

/* ── Chat Simulator ── */
.chat-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.chat-bubble {
  max-width: 85%;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--fs-sm);
  line-height: 1.6;
  animation: bubbleIn 0.3s ease;
}

@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(10px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.chat-bubble--client {
  align-self: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.chat-bubble--user {
  align-self: flex-end;
  background: var(--color-primary-dim);
  border: 1px solid var(--color-primary);
  color: var(--color-text);
}

.chat-bubble--error {
  align-self: flex-end;
  background: var(--color-error-dim);
  border: 1px solid var(--color-error);
  color: var(--color-text);
}

.chat-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.chat-option {
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  font-family: var(--font-body);
}

.chat-option:hover {
  border-color: rgba(204, 255, 0, 0.40);
  background: rgba(204, 255, 0, 0.08);
}

.chat-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-dim);
}

.chat-option.wrong {
  border-color: var(--color-error);
  background: var(--color-error-dim);
}

/* ── Survey ── */
.survey-question {
  margin-bottom: var(--space-xl);
}

.survey-question__text {
  font-family: var(--font-heading);
  font-size: var(--fs-md);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.survey-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.survey-option {
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  font-family: var(--font-body);
}

.survey-option:hover {
  border-color: rgba(204, 255, 0, 0.40);
}

.survey-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
  color: var(--color-primary);
}

/* ── Plan Card ── */
.plan-card {
  padding: var(--space-2xl);
  text-align: center;
}

.plan-card__title {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-xl);
}

.plan-card__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.plan-card__item:last-of-type {
  border-bottom: none;
}

.plan-card__label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  min-width: 100px;
  flex-shrink: 0;
}

.plan-card__value {
  font-size: var(--fs-sm);
  color: var(--color-text);
  line-height: 1.6;
}

/* ── Toast Notification ── */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  pointer-events: auto;
  animation: toastIn 0.4s ease, toastOut 0.4s ease 2.6s forwards;
}

.toast-xp {
  background: var(--color-primary-dim);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-glow-sm);
}

.toast-success {
  background: var(--color-success-dim);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.toast-error {
  background: var(--color-error-dim);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(40px); }
}

/* ── Particle Container ── */
.particles-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: var(--z-top);
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 6px var(--color-primary-glow);
}

/* ── Hint Message ── */
.hint-message {
  padding: var(--space-md);
  background: rgba(255, 181, 71, 0.1);
  border: 1px solid rgba(255, 181, 71, 0.3);
  border-radius: var(--radius-md);
  color: var(--color-warning);
  font-size: var(--fs-sm);
  margin-top: var(--space-sm);
  animation: bubbleIn 0.3s ease;
}

/* ── Congrats Section ── */
.congrats {
  text-align: center;
  padding: var(--space-2xl);
}

.congrats__emoji {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  animation: bounce 1s ease infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

.congrats__title {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  text-shadow: 0 0 30px rgba(204, 255, 0, 0.3);
}

.congrats__text {
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  margin-bottom: var(--space-xl);
}