:root {
  --crimson: #dc143c;
  --pcos-purple: #8a2be2;
  --fertility-green: #2e8b57;
  --ovulation-orange: #ff8c00;
  --light-bg: #f9f5f6;
  --dark-bg: #1a1a2e;
  --card-bg: #ffffff;
  --dark-card-bg: #16213e;
  --text-color: #333;
  --dark-text-color: #f1f1f1;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.1);
  --rose-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --fertility-gradient: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%);
}

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

body {
  font-family: 'Poppins', sans-serif;
  background: var(--light-bg);
  color: var(--text-color);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Container Layout */
.container {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  background: var(--card-bg);
  padding: 2rem 1rem;
  box-shadow: var(--card-shadow);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  padding-left: 0.5rem;
}

.logo i {
  font-size: 1.8rem;
  background: var(--rose-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--rose-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

nav a {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

nav a:hover {
  background: rgba(220, 20, 60, 0.1);
}

nav a.active {
  background: rgba(220, 20, 60, 0.2);
  color: var(--crimson);
}

/* Main Content */
.main {
  flex: 1;
  padding: 2rem;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.period-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  color: #666;
}

.info-item {
  background: rgba(220, 20, 60, 0.05);
  padding: 0.75rem;
  border-radius: 8px;
}

/* Cards */
.tracker-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--card-shadow);
}

/* Form Elements */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

input, select, textarea {
  width: 100%;
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid #ddd;
  font-family: 'Poppins', sans-serif;
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

/* Buttons */
.primary-btn {
  background: var(--rose-gradient);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
}

.secondary-btn {
  background: none;
  border: 2px solid var(--crimson);
  color: var(--crimson);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.secondary-btn:hover {
  background: rgba(220, 20, 60, 0.1);
}

/* Symptoms Grid */
.symptoms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.symptom-btn {
  padding: 0.75rem;
  background: none;
  border: 1px solid #ddd;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.symptom-btn:hover {
  border-color: var(--crimson);
}

.symptom-btn.active {
  background: rgba(220, 20, 60, 0.1);
  border-color: var(--crimson);
  color: var(--crimson);
}

/* Calendar */
.calendar-container {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.calendar-header button {
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-color);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.5rem;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.calendar-day:hover {
  background: rgba(220, 20, 60, 0.1);
}

.calendar-day.period {
  background: rgba(220, 20, 60, 0.2);
  color: var(--crimson);
  font-weight: 600;
}

.calendar-day.today {
  border: 2px solid var(--crimson);
}

.calendar-day.other-month {
  opacity: 0.4;
}

.symptom-dots {
  position: absolute;
  bottom: 5px;
  display: flex;
  gap: 2px;
}

.symptom-dots span {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--crimson);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.stat-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  text-align: center;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0.5rem 0;
  color: var(--crimson);
}

.stat-trend {
  font-size: 0.9rem;
  color: #666;
}

/* Chart Containers */
.chart-container {
  height: 300px;
  margin: 1.5rem 0;
  position: relative;
}

/* Fertility Card */
.fertility-card {
  background: linear-gradient(135deg, rgba(46, 139, 87, 0.1) 0%, rgba(168, 224, 99, 0.1) 100%);
  border-left: 4px solid var(--fertility-green);
}

.fertility-status {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.fertility-icon {
  width: 60px;
  height: 60px;
  background: var(--fertility-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

.fertility-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.metric {
  background: rgba(255,255,255,0.7);
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
}

.metric-label {
  font-size: 0.9rem;
  color: #666;
}

.metric-value {
  font-weight: 600;
  margin-top: 0.5rem;
}

/* Phase Cards */
.phase-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.phase-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
}

.phase-card[data-phase="menstrual"] {
  border-top: 4px solid var(--crimson);
}

.phase-card[data-phase="follicular"] {
  border-top: 4px solid #4e9efd;
}

.phase-card[data-phase="ovulation"] {
  border-top: 4px solid var(--ovulation-orange);
}

.phase-card[data-phase="luteal"] {
  border-top: 4px solid #8a2be2;
}

.phase-tips {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed #ddd;
  font-size: 0.9rem;
}

/* Nutrition Tabs */
.nutrition-tabs {
  margin-top: 1.5rem;
}

.tab-header {
  display: flex;
  border-bottom: 1px solid #ddd;
  margin-bottom: 1rem;
}

.tab-btn {
  padding: 0.75rem 1.5rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  font-family: 'Poppins', sans-serif;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active {
  border-bottom-color: var(--pcos-purple);
  font-weight: 600;
  color: var(--pcos-purple);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.food-list {
  list-style: none;
}

.food-list li {
  margin: 0.75rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.food-list i {
  font-size: 1.1rem;
}

.food-list i.fa-check-circle {
  color: var(--fertility-green);
}

.food-list i.fa-times-circle {
  color: var(--crimson);
}

/* Health Stats */
.health-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.health-stat {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  box-shadow: var(--card-shadow);
}

.stat-label {
  font-size: 0.9rem;
  color: #666;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0.5rem 0;
}

.stat-category {
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
}

/* Blood Test Table */
.blood-test-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.blood-test-table th, 
.blood-test-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

.blood-test-table th {
  font-weight: 600;
}

.blood-test-table input {
  width: 70px;
  padding: 0.25rem 0.5rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  text-align: right;
}

.status-normal {
  color: var(--fertility-green);
  font-weight: 600;
}

.status-low {
  color: var(--crimson);
  font-weight: 600;
}

/* Resources Grid */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.resource-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  text-align: center;
}

.resource-icon {
  width: 60px;
  height: 60px;
  background: var(--rose-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  margin: 0 auto 1rem;
}

.resource-card button {
  margin: 0.5rem 0;
  width: 100%;
}

/* Video Grid */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.video-card {
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.video-card img {
  width: 100%;
  height: auto;
  display: block;
}

.video-card h4 {
  padding: 1rem 1rem 0;
}

.video-card p {
  padding: 0 1rem 1rem;
  color: #666;
  font-size: 0.9rem;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--rose-gradient);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
  z-index: 1000;
}

.dark-mode-toggle:hover {
  transform: translateY(-3px);
}

/* Onboarding Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 16px;
  width: 90%;
  max-width: 500px;
  box-shadow: var(--card-shadow);
}

/* Page Content */
.page {
  display: none;
}

.page.active {
  display: block;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  padding: 15px;
  font-size: 1.5rem;
  cursor: pointer;
  background: var(--card-bg);
  border-bottom: 1px solid #ddd;
}

/* ======================
   RESPONSIVE DESIGN
   ====================== */
@media (max-width: 992px) {
  .container {
    grid-template-columns: 180px 1fr;
  }
  
  .sidebar {
    padding: 15px;
  }
  
  .main {
    padding: 20px;
  }
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
  
  .sidebar {
    display: none;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid #e0e0e0;
  }
  
  .sidebar.active {
    display: block;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  nav {
    flex-direction: column;
    overflow-x: visible;
    padding-bottom: 0;
  }
  
  nav a {
    white-space: normal;
    padding: 10px 15px;
  }
  
  .symptoms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .period-info {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .main {
    padding: 15px;
  }
  
  .tracker-card {
    padding: 15px;
  }
  
  .symptoms-grid {
    grid-template-columns: 1fr;
  }
  
  button.primary-btn, button.secondary-btn {
    width: 100%;
  }
}

/* Dark Mode Styles */
body.dark-mode {
  background: var(--dark-bg);
  color: var(--dark-text-color);
}

.dark-mode .sidebar,
.dark-mode .tracker-card,
.dark-mode .calendar-container,
.dark-mode .stat-card,
.dark-mode .modal-content {
  background: var(--dark-card-bg);
}

.dark-mode input,
.dark-mode select,
.dark-mode textarea,
.dark-mode .blood-test-table input {
  background: #16213e;
  border-color: #444;
  color: #f1f1f1;
}

.dark-mode .calendar-header button,
.dark-mode .tab-btn {
  color: var(--dark-text-color);
}

.dark-mode .period-info,
.dark-mode .stat-trend,
.dark-mode .video-card p {
  color: #aaa;
}

.dark-mode .phase-tips,
.dark-mode .blood-test-table th,
.dark-mode .blood-test-table td {
  border-color: #444;
}

.dark-mode nav a:hover {
  background: rgba(220, 20, 60, 0.2);
}

.dark-mode .symptom-btn {
  background: #16213e;
  border-color: #444;
}

.dark-mode .symptom-btn:hover {
  border-color: var(--crimson);
}

.dark-mode .symptom-btn.active {
  background: rgba(220, 20, 60, 0.3);
}