/* ACSI4 Demo Day - Modern Design with Modal */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Montserrat:wght@600;700;800&display=swap');

:root {
  --red: #821f2d;
  --red-dark: #661820;
  --navy: #013559;
  --navy-light: #1a4a6e;
  --gray-900: #1a202c;
  --gray-800: #2d3748;
  --gray-700: #4a5568;
  --gray-600: #718096;
  --gray-400: #cbd5e0;
  --gray-200: #e2e8f0;
  --gray-100: #f7fafc;
  --white: #ffffff;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.2s ease;
}

* {
  box-sizing: border-box;
}

.acsi4-demo-day {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  color: var(--gray-800);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem 0;
  color: var(--gray-900);
}

h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
  font-size: 1.1rem;
  line-height: 1.7;
  margin: 0 0 1.5rem 0;
  color: var(--gray-700);
}

a {
  color: var(--red);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--red-dark);
}

/* Layout */
section {
  margin: 4rem 0;
  padding: 0 2rem;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-100) 100%);
  padding: 4rem 2rem;
  text-align: center;
  border-radius: var(--radius);
  margin: 2rem;
  box-shadow: var(--shadow);
}

.hero-content {
  max-width: 600px;
  margin: 0 auto;
}

.hero-logo {
  height: 120px;
  width: auto;
  margin: 0 auto 2rem auto;
  display: block;
  transition: var(--transition);
}

.hero-logo:hover {
  transform: scale(1.05);
}

.hero h1 {
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--gray-700);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

/* Buttons */
.cta-btn {
  display: inline-block;
  padding: 1rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.cta-btn.primary {
  background: var(--red);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(130, 31, 45, 0.3);
}

.cta-btn.primary:hover {
  background: var(--red-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(130, 31, 45, 0.4);
  color: var(--white);
}

.cta-btn.secondary {
  background: var(--white);
  color: var(--red);
  border: 2px solid var(--red);
}

.cta-btn.secondary:hover {
  background: var(--red);
  color: var(--white);
}

.cta-btn.large {
  padding: 1.25rem 3rem;
  font-size: 1.2rem;
}

/* Modal Styles */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  z-index: 9999;
  animation: fadeIn 0.3s ease-out;
}

.modal-overlay.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-content {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease-out;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--gray-600);
  cursor: pointer;
  z-index: 10;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

/* Modal animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { 
    opacity: 0; 
    transform: translateY(30px) scale(0.95); 
  }
  to { 
    opacity: 1; 
    transform: translateY(0) scale(1); 
  }
}

/* Countdown */
.countdown-section {
  text-align: center;
  background: var(--gray-100);
  border-radius: var(--radius);
  margin: 2rem;
  padding: 3rem 2rem;
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.5rem;
  max-width: 600px;
  margin: 2rem auto 0;
}

.countdown-time {
  background: var(--white);
  padding: 1.5rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.countdown-time:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.countdown-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--red);
  line-height: 1;
}

.countdown-label {
  font-size: 0.9rem;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  margin-top: 0.5rem;
}

.countdown-ended {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--red);
  padding: 2rem;
}

/* About */
.about {
  text-align: center;
}

.quick-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  max-width: 600px;
  margin: 3rem auto;
  justify-items: center;
}

.stat {
  text-align: center;
  min-width: 120px;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  line-height: 1;
  transition: var(--transition);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  white-space: nowrap;
  margin-top: 0.5rem;
}

/* Expect */
.expect-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.expect-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
  border: 2px solid transparent;
}

.expect-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--red);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.expect-card h3 {
  margin-bottom: 0.5rem;
  color: var(--gray-900);
}

.expect-card p {
  font-size: 1rem;
  margin: 0;
  color: var(--gray-600);
}

/* ACSI4 Info */
.acsi4-info {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  margin: 2rem;
  text-align: center;
}

.info-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.highlight {
  background: var(--white);
  padding: 1.5rem;
  border-radius: var(--radius);
  text-align: left;
  box-shadow: var(--shadow);
}

.highlight h4 {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.highlight p {
  font-size: 0.95rem;
  margin: 0;
  color: var(--gray-600);
}

/* Audience */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.audience-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--red);
  transition: var(--transition);
}

.audience-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.audience-card h3 {
  margin-bottom: 1rem;
  color: var(--gray-900);
}

.audience-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.audience-card li {
  padding: 0.5rem 0;
  color: var(--gray-700);
  position: relative;
  padding-left: 1.5rem;
}

.audience-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--red);
  font-weight: 600;
}

/* Audience Note */
.audience-note {
  margin-top: 2rem;
  text-align: center;
  padding: 1.5rem;
  background: rgba(130, 31, 45, 0.05);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--red);
}

.audience-note p {
  margin: 0;
  font-size: 1rem;
  color: var(--gray-700);
  font-style: italic;
}

/* Event Details */
.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.detail-card {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

.detail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.detail-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.detail-card h3 {
  margin-bottom: 1rem;
  color: var(--gray-900);
}

.detail-card p {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.detail-card p:last-child {
  margin-bottom: 0;
}

/* Partners */
.partners {
  padding: 0 2rem;
}

.partners-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  margin-top: 2rem;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.partner {
  background: var(--white);
  padding: 3rem 4rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  align-items: flex-start;
  gap: 4rem;
  transition: var(--transition);
  text-align: left;
}

.partner:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.partner img {
  height: 135px;
  width: 135px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.8;
  transition: var(--transition);
}

.partner:hover img {
  opacity: 1;
}

.partner-content {
  flex: 1;
  text-align: left;
}

.partner h4 {
  margin-bottom: 1rem;
  color: var(--gray-900);
  font-size: 1.2rem;
  text-align: left;
}

.partner p {
  font-size: 1rem;
  margin: 0;
  color: var(--gray-700);
  line-height: 1.6;
  text-align: left;
}

/* Final CTA */
.final-cta {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: var(--white);
  padding: 4rem 2rem;
  border-radius: var(--radius);
  text-align: center;
  margin: 2rem;
}

.final-cta h2 {
  color: var(--white);
  margin-bottom: 1rem;
}

.final-cta p {
  color: rgba(255,255,255,0.9);
  margin-bottom: 2rem;
  font-size: 1.2rem;
}

/* Responsive */
@media (max-width: 768px) {
  section {
    margin: 2rem 0;
    padding: 0 1rem;
  }

  .partners {
    padding: 0 1rem;
  }

  .hero, .countdown-section, .acsi4-info, .final-cta {
    margin: 1rem;
    padding: 2rem 1rem;
  }

  .hero-logo {
    height: 100px;
  }

  .quick-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 400px;
  }

  .quick-stats .stat:nth-child(3) {
    grid-column: 1 / -1;
    justify-self: center;
  }

  .expect-grid, .audience-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .audience-note {
    margin-top: 1.5rem;
    padding: 1rem;
  }

  .countdown-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .info-highlights {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .partners-list {
    gap: 2rem;
  }

  .partner {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
    padding: 2rem;
  }

  .partner img {
    height: 112px;
    width: 112px;
    align-self: center;
  }

  .partner-content {
    text-align: left;
  }

  /* Modal responsive */
  .modal-content {
    margin: 0.5rem;
    max-height: 95vh;
  }
}

@media (max-width: 480px) {
  .partners {
    padding: 0 0.75rem;
  }

  .hero-logo {
    height: 80px;
  }

  .countdown-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .countdown-number {
    font-size: 2rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .quick-stats {
    gap: 1.5rem;
    max-width: 350px;
    grid-template-columns: repeat(2, 1fr);
  }

  .quick-stats .stat:nth-child(3) {
    grid-column: 1 / -1;
    justify-self: center;
  }

  .stat {
    min-width: 100px;
  }

  .partner img {
    height: 90px;
    width: 90px;
  }

  /* Modal mobile */
  .modal-content {
    margin: 0.25rem;
    border-radius: var(--radius-sm);
  }
}