/* Think+ Ventures Brand Colors and Styling */
:root {
  --primary-orange: #ff5722;
  --secondary-orange: #ff8a65;
  --accent-orange: #ff3d00;
  --light-gray: #f5f5f5;
  --medium-gray: #e0e0e0;
  --dark-gray: #424242;
  --white: #ffffff;
  --success-green: #4caf50;
  --warning-yellow: #ffc107;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--dark-gray);
  background-color: var(--white);
}

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-orange) 0%, var(--secondary-orange) 100%);
  color: var(--white);
  padding: 3rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="plus" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 8 2 L 12 2 L 12 8 L 18 8 L 18 12 L 12 12 L 12 18 L 8 18 L 8 12 L 2 12 L 2 8 L 8 8 Z" fill="none" stroke="rgba(255,255,255,0.15)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23plus)"/></svg>');
  opacity: 0.4;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.logo {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  position: relative;
  display: inline-block;
}

.logo::before {
  content: "Think";
  background: linear-gradient(45deg, var(--white), #ffecb3);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo::after {
  content: "+";
  font-size: 3.5rem;
  position: relative;
  top: -0.1rem;
  margin: 0 0.1rem;
  color: var(--white);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.tagline {
  font-size: 1.3rem;
  font-weight: 300;
  letter-spacing: 1px;
  opacity: 0.95;
  margin-bottom: 2rem;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

/* Navigation */
.nav {
  background: var(--white);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.nav-list {
  display: flex;
  list-style: none;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1rem 0;
}

.nav-item {
  cursor: pointer;
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  transition: all 0.3s ease;
  font-weight: 500;
  color: var(--dark-gray);
  position: relative;
  overflow: hidden;
}

.nav-item::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--primary-orange);
  transition: width 0.3s ease;
}

.nav-item:hover::before, .nav-item.active::before {
  width: 100%;
}

.nav-item:hover, .nav-item.active {
  background: var(--light-gray);
  color: var(--primary-orange);
  transform: translateY(-2px);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Section Styles */
.section {
  padding: 5rem 0;
  display: none;
}

.section.active {
  display: block;
}

.section-title {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--primary-orange);
  margin-bottom: 2.5rem;
  text-align: center;
  position: relative;
}

.section-title::after {
  content: "+";
  font-size: 2rem;
  position: absolute;
  margin-left: 0.5rem;
  color: var(--secondary-orange);
  opacity: 0.7;
}

.section-subtitle {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--dark-gray);
  margin: 2.5rem 0 1.5rem 0;
  position: relative;
  padding-left: 1.5rem;
}

.section-subtitle::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--primary-orange);
  font-weight: 700;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2.5rem 0;
}

.card {
  background: var(--white);
  border-radius: 8px;
  padding: 2.2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  border: none;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "+";
  position: absolute;
  top: -15px;
  right: -15px;
  font-size: 5rem;
  color: var(--medium-gray);
  opacity: 0.2;
  font-weight: 700;
  transform: rotate(15deg);
  transition: all 0.4s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(255, 87, 34, 0.15);
}

.card:hover::before {
  transform: rotate(45deg);
  opacity: 0.3;
}

.card-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--primary-orange);
  margin-bottom: 1.2rem;
  position: relative;
  z-index: 1;
}

.card-content {
  color: var(--dark-gray);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin: 3.5rem 0;
}

.stat-card {
  text-align: center;
  padding: 2.5rem 2rem;
  background: var(--white);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  position: relative;
  overflow: hidden;
  border: none;
}

.stat-card::before {
  content: "+";
  position: absolute;
  bottom: -20px;
  right: -10px;
  font-size: 6rem;
  color: var(--medium-gray);
  opacity: 0.15;
  font-weight: 700;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary-orange);
  display: block;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1.1rem;
  color: var(--dark-gray);
  font-weight: 500;
}

/* Timeline */
.timeline {
  position: relative;
  padding: 3rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--medium-gray);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin: 3rem 0;
  padding: 0 2rem;
}

.timeline-item:nth-child(odd) {
  text-align: right;
  padding-right: calc(50% + 2.5rem);
}

.timeline-item:nth-child(even) {
  text-align: left;
  padding-left: calc(50% + 2.5rem);
}

.timeline-marker {
  position: absolute;
  left: 50%;
  top: 1rem;
  width: 24px;
  height: 24px;
  background: var(--white);
  border-radius: 50%;
  transform: translateX(-50%);
  border: 2px solid var(--primary-orange);
  box-shadow: 0 0 0 5px rgba(255, 87, 34, 0.1);
  z-index: 2;
}

.timeline-marker::before {
  content: "+";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-orange);
}

.timeline-content {
  background: var(--white);
  padding: 1.8rem;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  border: none;
  position: relative;
  transition: all 0.3s ease;
}

.timeline-content:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(255, 87, 34, 0.15);
}

.timeline-year {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary-orange);
  margin-bottom: 0.8rem;
  display: inline-block;
  padding: 0.2rem 1rem;
  background: rgba(255, 87, 34, 0.08);
  border-radius: 4px;
}

/* Competitive Analysis */
.competitor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2.5rem 0;
}

.competitor-card {
  background: var(--white);
  border-radius: 8px;
  padding: 1.8rem;
  border-top: 4px solid var(--primary-orange);
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  position: relative;
  transition: all 0.3s ease;
}

.competitor-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(255, 87, 34, 0.15);
}

.competitor-card::after {
  content: "+";
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  color: var(--medium-gray);
  opacity: 0.5;
  font-weight: 700;
}

.competitor-name {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: 0.8rem;
}

.competitor-focus {
  font-size: 0.9rem;
  color: var(--primary-orange);
  font-weight: 500;
  margin-bottom: 1.2rem;
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: rgba(255, 87, 34, 0.08);
  border-radius: 4px;
}

/* Investment Recommendations */
.investment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2.5rem;
  margin: 2.5rem 0;
}

.investment-card {
  background: var(--white);
  border-radius: 8px;
  padding: 2.2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  border: none;
}

.investment-card::before {
  content: '+';
  position: absolute;
  top: -15px;
  right: -15px;
  font-size: 6rem;
  color: var(--medium-gray);
  opacity: 0.1;
  font-weight: 700;
  transform: rotate(15deg);
  transition: all 0.4s ease;
}

.investment-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(255, 87, 34, 0.15);
}

.investment-card:hover::before {
  transform: rotate(45deg);
  opacity: 0.2;
}

.investment-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dark-gray);
  margin-bottom: 0.8rem;
}

.investment-sector {
  display: inline-block;
  background: var(--primary-orange);
  color: var(--white);
  padding: 0.4rem 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.2rem;
}

.investment-funding {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--success-green);
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
  position: relative;
}

.investment-funding::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--success-green);
  font-weight: 700;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.9rem 2.2rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: width 0.3s ease;
  z-index: -1;
}

.btn:hover::before {
  width: 100%;
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(255, 87, 34, 0.3);
}

.btn-primary::after {
  content: "+";
  margin-left: 0.5rem;
  font-weight: 700;
}

.btn-secondary {
  background: transparent;
  color: var(--primary-orange);
  border: 2px solid var(--primary-orange);
}

.btn-secondary:hover {
  background: rgba(255, 87, 34, 0.08);
  color: var(--primary-orange);
  transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 768px) {
  .timeline::before {
    left: 2rem;
  }
  
  .timeline-item {
    padding-left: 4rem !important;
    padding-right: 1rem !important;
    text-align: left !important;
  }
  
  .timeline-marker {
    left: 2rem !important;
    transform: none !important;
  }
  
  .nav-list {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .logo {
    font-size: 2rem;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes plusRotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes plusPulse {
  0% {
    transform: scale(1);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.8;
  }
  100% {
    transform: scale(1);
    opacity: 0.5;
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease-out;
}

.plus-icon {
  display: inline-block;
  font-weight: bold;
  color: var(--primary-orange);
  margin: 0 0.2rem;
  position: relative;
  top: -0.1rem;
}

.plus-rotate {
  animation: plusRotate 8s linear infinite;
  display: inline-block;
}

.plus-pulse {
  animation: plusPulse 2s ease-in-out infinite;
  display: inline-block;
}

/* Interactive Elements */
.interactive-chart {
  background: var(--white);
  border-radius: 8px;
  padding: 2.5rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  margin: 2.5rem 0;
  position: relative;
  overflow: hidden;
}

.interactive-chart::before {
  content: "+";
  position: absolute;
  top: -20px;
  right: -20px;
  font-size: 8rem;
  color: var(--medium-gray);
  opacity: 0.05;
  font-weight: 700;
  transform: rotate(15deg);
}

.chart-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--primary-orange);
  margin-bottom: 1.5rem;
  text-align: center;
  position: relative;
}

.chart-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--primary-orange);
  opacity: 0.5;
}

/* Footer */
.footer {
  background: var(--dark-gray);
  color: var(--white);
  text-align: center;
  padding: 3rem 0;
  margin-top: 5rem;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-orange);
}

.footer::after {
  content: "+";
  position: absolute;
  bottom: -50px;
  right: 50px;
  font-size: 12rem;
  color: rgba(255, 255, 255, 0.03);
  font-weight: 700;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

/* Loading Animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  border-top-color: var(--secondary-blue);
  animation: spin 1s ease-in-out infinite;
}

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