:root {
  --bg: #f6f7fb;
  --text: #222;
  --accent: #4b7bec;
  --accent-soft: #d7e3ff;
  --card: #ffffff;
  --shadow: rgba(0,0,0,0.05);
  --red: #ff6b6b;
  --green: #38ada9;
  --flow-bg1: #dde9f5;
  --flow-bg2: #ffffff;
  --yellow: #feca57;
  --orange: #ff9ff3;
}

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, var(--accent), #5a8ef0);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  color: white;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

header h1::before {
  content: "🎯";
  font-size: 1.5rem;
}

main {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
  flex: 1;
}

.card {
  background: var(--card);
  box-shadow: 0 3px 10px var(--shadow);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.card-buttons {
  margin-top: 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card-buttons button {
  padding: 0.8rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  width: 100%;
  transition: transform 0.2s, opacity 0.2s;
}

.card-buttons button:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.card-buttons button:active {
  transform: translateY(0);
}

#setIntentInline { background: var(--accent); color: white; }
#resetSession { background: var(--red); color: white; }
#flowModeBtn { background: var(--green); color: white; }

/* Timer */
#timer {
  font-size: 3rem;
  font-weight: 600;
  text-align: center;
  margin: 1rem 0;
}

#startTimer {
  width: 100%;
  padding: 0.8rem;
  border: none;
  border-radius: 8px;
  background: var(--green);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

#startTimer:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

#startTimer:active {
  transform: translateY(0);
}

#startTimer.running {
  background: var(--orange);
}

#startTimer.paused {
  background: var(--accent);
}

/* Momentum meter */
.momentum-wrapper {
  margin-top: 1rem;
}

.progress-container {
  height: 24px;
  background: var(--accent-soft);
  border-radius: 50px;
  overflow: visible;
  margin-top: 10px;
  position: relative;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--green));
  transition: width 0.3s ease;
  border-radius: 50px;
  position: relative;
  z-index: 0;
}

.momentum-percentage {
  text-align: center;
  margin-top: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
}

.milestone-markers {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.milestone-marker {
  width: 2px;
  height: 100%;
  background: rgba(0, 0, 0, 0.1);
  position: absolute;
  top: 0;
  transform: translateX(-50%);
}

.milestone-marker::after {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--card);
  border: 2px solid rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}

.milestone-marker.reached::after {
  background: var(--yellow);
  border-color: var(--yellow);
  box-shadow: 0 0 10px var(--yellow);
  animation: milestonePulse 0.6s ease;
}

.milestone-marker.reached.milestone-25::after {
  background: var(--yellow);
  border-color: var(--yellow);
}

.milestone-marker.reached.milestone-50::after {
  background: var(--orange);
  border-color: var(--orange);
}

.milestone-marker.reached.milestone-75::after {
  background: var(--accent);
  border-color: var(--accent);
}

.milestone-marker.reached.milestone-100::after {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 15px var(--green);
}

@keyframes milestonePulse {
  0%, 100% { transform: translateX(-50%) scale(1); }
  50% { transform: translateX(-50%) scale(1.3); }
}

.milestone-celebration {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 100;
  pointer-events: none;
  font-size: 3rem;
  font-weight: bold;
  animation: celebrationAnimation 1.5s ease forwards;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

@keyframes celebrationAnimation {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.5);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.2);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1) translateY(-50px);
  }
}

/* Distraction Tracking */
.distraction-stats {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--accent-soft);
}

.distraction-stats h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.distraction-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-size: 0.9rem;
  color: #666;
  border-bottom: 1px solid #f0f0f0;
}

.distraction-item:last-child {
  border-bottom: none;
}

.distraction-time {
  color: var(--red);
  font-weight: 500;
}

.distraction-summary {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.distraction-summary-item {
  flex: 1;
  min-width: 100px;
  text-align: center;
  padding: 0.5rem;
  background: var(--accent-soft);
  border-radius: 8px;
}

.distraction-summary-item strong {
  display: block;
  font-size: 1.2rem;
  color: var(--accent);
}

.distraction-summary-item span {
  font-size: 0.85rem;
  color: #666;
}

/* FLOW MODE */
#flowMode {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, var(--flow-bg1), var(--flow-bg2));
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  animation: fadeIn 0.3s ease;
  pointer-events: none;
}

#flowMode.active {
  display: flex;
  pointer-events: all;
}

#flowTimer {
  font-size: 5rem;
  margin-bottom: 1rem;
}

#flowIntent {
  opacity: 0.7;
  max-width: 80%;
  text-align: center;
  margin-bottom: 2rem;
  font-size: 1.2rem;
}

#exitFlow {
  padding: 0.8rem 1.5rem;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  color: white;
  font-size: 1.1rem;
  transition: transform 0.2s, opacity 0.2s;
}

#exitFlow:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* INTENT MODAL */
#intentModal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.25);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 40;
  backdrop-filter: blur(2px);
}

#intentModal.active {
  display: flex;
}

.modal-box {
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  max-width: 420px;
  width: 92%;
  box-shadow: 0 4px 15px var(--shadow);
}

.modal-box input, .modal-box textarea {
  width: 100%;
  margin-top: 0.7rem;
  padding: 0.7rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1rem;
  box-sizing: border-box;
}

.modal-box button {
  margin-top: 1rem;
  padding: 0.8rem;
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.2s, opacity 0.2s;
}

.modal-box button:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

/* REFLECTION POPUP */
#reflectionPopup {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
  z-index: 60;
  pointer-events: none;
}

#reflectionPopup.active {
  display: flex;
  pointer-events: all;
}

.popup-box {
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 4px 15px var(--shadow);
  text-align: center;
}

.popup-box h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.popup-box p {
  margin-bottom: 1.5rem;
  color: #666;
}

.popup-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.popup-buttons button {
  padding: 0.8rem 1.3rem;
  border: none;
  border-radius: 8px;
  color: white;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.2s, opacity 0.2s;
}

.popup-buttons button:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.popup-buttons button:active {
  transform: translateY(0);
}

#onTaskBtn {
  background: var(--green);
}

#offTaskBtn {
  background: var(--red);
}

/* ONBOARDING GUIDE */
#onboardingGuide {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, rgba(75, 123, 236, 0.95), rgba(56, 173, 169, 0.95));
  backdrop-filter: blur(10px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 2rem;
  animation: fadeIn 0.4s ease;
}

#onboardingGuide.active {
  display: flex;
}

.onboarding-container {
  max-width: 700px;
  width: 100%;
  background: var(--card);
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  overflow: hidden;
  animation: slideUp 0.5s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.onboarding-content {
  padding: 2.5rem;
}

.onboarding-header {
  text-align: center;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--accent-soft);
}

.onboarding-header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 2.5rem;
  color: var(--accent);
  font-weight: 700;
}

.onboarding-subtitle {
  margin: 0;
  font-size: 1.1rem;
  color: #666;
  font-style: italic;
}

.onboarding-steps {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.onboarding-steps::-webkit-scrollbar {
  width: 6px;
}

.onboarding-steps::-webkit-scrollbar-track {
  background: var(--accent-soft);
  border-radius: 10px;
}

.onboarding-steps::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 10px;
}

.onboarding-step {
  background: var(--accent-soft);
  padding: 1.5rem;
  border-radius: 12px;
  border-left: 4px solid var(--accent);
  transition: transform 0.2s, box-shadow 0.2s;
}

.onboarding-step:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.step-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.onboarding-step h3 {
  margin: 0 0 0.75rem 0;
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 600;
}

.onboarding-step p {
  margin: 0.5rem 0;
  line-height: 1.6;
  color: var(--text);
}

.onboarding-step p strong {
  color: var(--accent);
  font-weight: 600;
}

.psychology-note {
  margin-top: 1rem !important;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 8px;
  font-size: 0.9rem;
  border-left: 3px solid var(--green);
}

.psychology-note em {
  color: #555;
  font-style: normal;
}

.onboarding-footer {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--accent-soft);
}

.onboarding-continue {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--accent), var(--green));
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(75, 123, 236, 0.3);
}

.onboarding-continue:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(75, 123, 236, 0.4);
}

.onboarding-continue:active {
  transform: translateY(0);
}

.onboarding-skip {
  width: 100%;
  padding: 0.7rem;
  background: transparent;
  color: #666;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.onboarding-skip:hover {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

@media(max-width:600px){
  #flowTimer { font-size: 3.4rem; }
  #timer { font-size: 2.3rem; }
  main { padding: 1rem; }
  .card { padding: 1rem; }
  
  .onboarding-content {
    padding: 1.5rem;
  }
  
  .onboarding-header h1 {
    font-size: 2rem;
  }
  
  .onboarding-steps {
    max-height: 50vh;
  }
  
  .onboarding-step {
    padding: 1rem;
  }
  
  .step-icon {
    font-size: 2rem;
  }
}