/* ========================================
   Timeline Planner Styles
   ======================================== */

/* Main Layout */
.timeline-main {
  min-height: calc(100vh - var(--header-height) - var(--footer-height));
  background: var(--color-bg-tertiary);
  padding: var(--space-6) 0 var(--space-16);
}

.timeline-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Page Header */
.timeline-page-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.timeline-page-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-3);
}

.timeline-page-description {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
  margin: 0 auto;
}

/* Form */
.timeline-form {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-8);
}

.timeline-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.timeline-form-group {
  display: flex;
  flex-direction: column;
}

.timeline-form-group label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.timeline-form-group input,
.timeline-form-group select {
  width: 100%;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--color-text-primary);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.timeline-form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
}

.timeline-form-group input:focus,
.timeline-form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.timeline-form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Form Actions */
.timeline-form-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border-light);
}

/* Buttons */
.timeline-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.timeline-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.timeline-btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

.timeline-btn-secondary {
  background: var(--color-gray-100);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.timeline-btn-secondary:hover:not(:disabled) {
  background: var(--color-gray-200);
  border-color: var(--color-gray-300);
}

/* Summary Stats */
.timeline-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.timeline-summary-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-3);
  box-shadow: var(--shadow-sm);
}

.timeline-summary-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.timeline-summary-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Timeline Output */
.timeline-output {
  position: relative;
}

/* Empty State */
.timeline-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-16) var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  color: var(--color-text-muted);
}

.timeline-empty-state svg {
  margin-bottom: var(--space-4);
  opacity: 0.4;
}

.timeline-empty-state p {
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  max-width: 400px;
  margin: 0;
}

.timeline-empty-state strong {
  color: var(--color-text-secondary);
}

/* ========================================
   Vertical Timeline
   ======================================== */

.timeline-visual {
  position: relative;
  padding-left: var(--space-12);
}

/* Vertical line */
.timeline-visual::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
}

/* Phase Group */
.timeline-phase-group {
  position: relative;
  margin-bottom: var(--space-6);
}

.timeline-phase-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  width: fit-content;
}

.timeline-phase-label .phase-color-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.timeline-phase-label .phase-duration {
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
  margin-left: var(--space-1);
}

/* Milestone Item */
.timeline-milestone {
  position: relative;
  padding: var(--space-4) var(--space-5);
  padding-left: 0;
  margin-bottom: var(--space-4);
}

.timeline-milestone:last-child {
  margin-bottom: 0;
}

/* Dot on the vertical line */
.timeline-dot {
  position: absolute;
  left: calc(-1 * var(--space-12) + 12px);
  top: var(--space-5);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 3px solid var(--milestone-color, var(--color-gray-400));
  background: var(--color-white);
  z-index: 1;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline-milestone:hover .timeline-dot {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px var(--milestone-color-light, var(--color-gray-100));
}

/* Milestone Card */
.timeline-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--milestone-color, var(--color-gray-400));
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.timeline-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(2px);
}

.timeline-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.timeline-card-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  line-height: var(--line-height-tight);
}

.timeline-card-number {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 var(--space-2);
  background: var(--milestone-color-light, var(--color-gray-100));
  color: var(--milestone-color, var(--color-text-muted));
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
}

.timeline-card-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}

.timeline-card-date svg {
  display: inline-block;
  vertical-align: middle;
  margin-right: var(--space-1);
  margin-top: -2px;
}

.timeline-card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

.timeline-card-phase-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: var(--milestone-color-light, var(--color-gray-100));
  color: var(--milestone-color, var(--color-text-secondary));
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

/* Phase Colors for Milestones */
.timeline-milestone[data-phase="1"] {
  --milestone-color: var(--phase-1-color);
  --milestone-color-light: var(--phase-1-light);
}
.timeline-milestone[data-phase="2"] {
  --milestone-color: var(--phase-2-color);
  --milestone-color-light: var(--phase-2-light);
}
.timeline-milestone[data-phase="3"] {
  --milestone-color: var(--phase-3-color);
  --milestone-color-light: var(--phase-3-light);
}
.timeline-milestone[data-phase="4"] {
  --milestone-color: var(--phase-4-color);
  --milestone-color-light: var(--phase-4-light);
}
.timeline-milestone[data-phase="5"] {
  --milestone-color: var(--phase-5-color);
  --milestone-color-light: var(--phase-5-light);
}
.timeline-milestone[data-phase="6"] {
  --milestone-color: var(--phase-6-color);
  --milestone-color-light: var(--phase-6-light);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
  .timeline-main {
    padding: var(--space-4) 0 var(--space-12);
  }

  .timeline-container {
    padding: 0 var(--space-3);
  }

  .timeline-page-title {
    font-size: var(--font-size-2xl);
  }

  .timeline-form {
    padding: var(--space-4);
  }

  .timeline-form-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .timeline-form-actions {
    flex-direction: column;
  }

  .timeline-btn {
    width: 100%;
    justify-content: center;
  }

  .timeline-summary {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }

  .timeline-visual {
    padding-left: var(--space-10);
  }

  .timeline-visual::before {
    left: 15px;
  }

  .timeline-dot {
    left: calc(-1 * var(--space-10) + 8px);
    width: 16px;
    height: 16px;
  }

  .timeline-card {
    padding: var(--space-4);
  }

  .timeline-card-header {
    flex-direction: column;
    gap: var(--space-2);
  }

  .timeline-card-number {
    align-self: flex-start;
  }
}

@media (max-width: 480px) {
  .timeline-page-header {
    margin-bottom: var(--space-6);
  }

  .timeline-page-description {
    font-size: var(--font-size-sm);
  }

  .timeline-summary {
    grid-template-columns: 1fr 1fr;
  }

  .timeline-summary-card {
    padding: var(--space-3);
  }

  .timeline-summary-value {
    font-size: var(--font-size-lg);
  }

  .timeline-card-title {
    font-size: var(--font-size-sm);
  }

  .timeline-empty-state {
    padding: var(--space-10) var(--space-4);
  }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .timeline-form-actions,
  .timeline-form {
    display: none;
  }

  .timeline-main {
    padding: 0;
    background: white;
  }

  .timeline-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--color-border);
  }

  .timeline-summary-card {
    box-shadow: none;
    border: 1px solid var(--color-border);
  }
}

/* ========================================
   Accessibility
   ======================================== */

.timeline-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .timeline-card,
  .timeline-dot {
    transition: none;
  }
}