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

:root {
  --blue: #0D5CA8;
  --dark-blue: #083D6B;
  --green: #66A833;
  --light-green: #7BC943;
  --gold: #D8A31A;
  --white: #ffffff;
  --light-bg: #f7fafc;
  --text: #1f2937;
  --gray: #6b7280;
}

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

/* NAVBAR */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: white;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.nav-container {
  max-width: 1300px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo-section img {
  height: 60px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  transition: .3s;
}

.nav-links a:hover {
  color: var(--green);
}

.menu-toggle {
  display: none;
}

/* HERO */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  min-height: 90vh;
  padding: 4rem 6%;
  gap: 3rem;
  background: linear-gradient(135deg, #f7fafc, #eef7ff);
}

.hero-logo {
  width: 420px;
  max-width: 100%;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.3rem;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero h1 span {
  color: var(--green);
}

.hero p {
  font-size: 1.1rem;
  color: var(--gray);
  margin-bottom: 1.5rem;
}

.hero-info {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-info div {
  background: white;
  padding: 1rem 1.2rem;
  border-radius: 12px;
  box-shadow: 0 5px 14px rgba(0,0,0,0.08);
}

.hero-right img {
  width: 100%;
  border-radius: 24px;
}

/* BUTTONS */
.btn {
  padding: 1rem 2rem;
  text-decoration: none;
  border-radius: 12px;
  font-weight: 700;
  display: inline-block;
  transition: .3s;
}

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

.btn-secondary {
  background: var(--blue);
  color: white;
}

.btn:hover {
  transform: translateY(-3px);
}

/* SECTION */
section {
  padding: 5rem 6%;
}

.section-title {
  font-size: 2.4rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--dark-blue);
  font-weight: 800;
}

/* ABOUT */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.about-image img {
  width: 100%;
  border-radius: 24px;
}

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

.feature-card {
  background: white;
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: 0 5px 14px rgba(0,0,0,0.08);
}

.feature-card i {
  font-size: 2rem;
  color: var(--green);
  margin-bottom: 1rem;
}

/* DEADLINES */
.deadlines {
  background: var(--light-bg);
}

.deadline-grid {
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 1.5rem;
}

.deadline-card {
  background: white;
  padding: 2rem;
  border-radius: 18px;
  box-shadow: 0 5px 14px rgba(0,0,0,0.08);
  text-align: center;
}

.deadline-card p {
  color: var(--green);
  font-weight: bold;
}

/* COUNTDOWN */
.countdown {
  margin-top: 3rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.time-box {
  background: white;
  padding: 1.5rem;
  min-width: 120px;
  border-radius: 16px;
  text-align: center;
}

.time-box span {
  display: block;
  font-size: 2rem;
  color: var(--green);
  font-weight: 800;
}

/* SPEAKERS */
.speaker-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 2rem;
}

.speaker-card {
  text-align: center;
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 5px 14px rgba(0,0,0,0.08);
}

.speaker-card img {
  width: 100%;
  border-radius: 20px;
  margin-bottom: 1rem;
}

/* TOPICS */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 1.5rem;
}

.topic-card {
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: white;
  padding: 2rem;
  border-radius: 18px;
  font-weight: 700;
  text-align: center;
}

/* PROGRAM */
.program {
  background: var(--light-bg);
}

.program-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 2rem;
}

.program-card {
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 5px 14px rgba(0,0,0,0.08);
  text-align: center;
}

/* FOOTER */
footer {
  background: var(--dark-blue);
  color: white;
  text-align: center;
  padding: 4rem 2rem;
}

.footer-info {
  margin: 2rem 0;
}

.footer-info p {
  margin-bottom: 1rem;
}

/* RESPONSIVE */
@media (max-width: 992px) {
  .hero,
  .about-grid,
  .speaker-grid,
  .topics-grid,
  .program-grid,
  .deadline-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    text-align: center;
  }

  .hero-info {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .menu-toggle {
    display: block;
    border: none;
    background: none;
    font-size: 1.4rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .countdown {
    flex-wrap: wrap;
  }
}