@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@300;400;600;700;800&display=swap');


:root {
  --primary: #4361ee;
  --primary-light: #5a75f1;
  --secondary: #7209b7;
  --secondary-light: #8d2bd4;
  --accent: #f72585;
  --accent-light: #ff4d9d;
  --success: #06d6a0;
  --warning: #ffd166;
  --dark: #212529;
  --darker: #161a1d;
  --light: #f8f9fa;
  --gray: #e9ecef;
  --glass: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.25);
  --glass-highlight: rgba(255, 255, 255, 0.4);
  --shadow: 0 8px 32px rgba(31, 38, 135, 0.1);
  --transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --border-radius: 24px;
  --card-padding: 30px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Nunito', sans-serif;
}

body {
  /* font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; */
  font-family: 'Nunito', sans-serif;
  background-image: linear-gradient(to top, #2A9FD6 0%, #4B6BB0 100%);
  color: var(--dark);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header Styles */
header {
  padding: 60px 0 80px;
  background: linear-gradient(135deg, #4361ee, #3a0ca3);
  color: white;
  border-radius: 0 0 40px 40px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 15px 40px rgba(67, 97, 238, 0.3);
  margin-bottom: 50px;
}


#home-btn {
  position: fixed;
  top: 20px;
  left: 20px;
  /* background: var(--glass); */
  background-color: crimson;
  /* backdrop-filter: blur(10px); */
  padding: 6px 12px;
  border-radius: var(--border-radius);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  z-index: 10;
  color: whitesmoke;
  font-size: 1rem;
}



header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 20%),
    radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 20%);
  z-index: 0;
}

.header-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.logo {
  font-size: 2.2rem;
  margin-bottom: 15px;
  color: white;
  display: inline-flex;
  align-items: center;
  gap: 15px;
  background: var(--glass);
  backdrop-filter: blur(10px);
  padding: 15px 30px;
  border-radius: var(--border-radius);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  line-height: 1.1;
}

.subtitle {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  max-width: 700px;
  margin: 0 auto 30px;
  opacity: 0.9;
}

.particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  animation: float 15s infinite linear;
}

@keyframes float {
  0% {
    transform: translateY(0) translateX(0) rotate(0deg);
  }

  100% {
    transform: translateY(-100px) translateX(50px) rotate(360deg);
  }
}

/* Glass Morphism Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

.card {
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: var(--card-padding);
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--glass-highlight) 0%, transparent 60%);
  opacity: 0.3;
  transition: var(--transition);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(31, 38, 135, 0.2);
}

.card:hover::before {
  transform: translate(25%, 25%);
}

.card h2 {
  font-size: clamp(1.5rem, 2.5vw, 1.8rem);
  margin-bottom: 20px;
  color: yellow;
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}

.card h2 i {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 1.8rem;
}

.card ul {
  padding-left: 25px;
  margin: 15px 0;
}

.card li {
  margin-bottom: 12px;
  position: relative;
  color: rgba(255, 255, 255, 0.9);
}

.card li::before {
  content: "•";
  color: var(--accent);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

.card p {
  color: white;;
}

/* Reaction Visualization */
.reaction-viz {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  margin: 30px 0;
  position: relative;
}

.atom {
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 2;
}

.atom-circle {
  width: clamp(80px, 15vw, 100px);
  height: clamp(80px, 15vw, 100px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  position: relative;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.atom-1 {
  background: linear-gradient(135deg, #4361ee, #3a0ca3);
  color: white;
}

.atom-2 {
  background: linear-gradient(135deg, #f72585, #b5179e);
  color: white;
}

.atom-label {
  margin-top: 15px;
  font-weight: 600;
  color: black;
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 15px;
  border-radius: 20px;
  text-align: center;
  font-size: clamp(0.9rem, 1.5vw, 1rem);
  backdrop-filter: blur(5px);
}

.atom-label2 {
  margin: 15px;
  font-weight: 600;
  font-size: 14px !important;
  width: 160px;
  color: black;
  background: rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 20px;
  text-align: center;
  backdrop-filter: blur(5px);
}

.electron-flow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transform: translate(-50%, -50%);
  border-radius: 2px;
  overflow: hidden;
}

.electron {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--warning);
  border-radius: 50%;
  top: -4px;
  box-shadow: 0 0 10px var(--warning);
  animation: electron-flow 2s infinite linear;
}

@keyframes electron-flow {
  0% {
    left: -20px;
  }

  100% {
    left: 100%;
  }
}

/* Test Section */
.test-section {
  background: linear-gradient(135deg, #7209b7, #560bad);
  border-radius: var(--border-radius);
  padding: 40px;
  margin: 50px 0;
  color: white;
  position: relative;
  overflow: hidden;
}

.test-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.1) 0%, transparent 30%),
    radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 30%);
}

.test-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
}

.test-title {
  text-align: center;
  margin-bottom: 30px;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
}

.question {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  padding: 25px;
  margin-bottom: 25px;
}

.question p {
  font-size: clamp(1.1rem, 1.8vw, 1.2rem);
  margin-bottom: 15px;
  font-weight: 500;
}

.input-group {
  display: flex;
  gap: 15px;
  margin-top: 15px;
  flex-wrap: wrap;
}

.input-group input {
  flex: 1 1 200px;
}

input {
  padding: 14px 20px;
  border: none;
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
  color: white;
  font-size: 1rem;
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.2);
  width: 100%;
}

input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.25);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.answer-select {
  padding: 10px 14px;
  border: none;
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
  color: white;
  font-size: 1rem;
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.answer-select option {
  outline: none;
  color: black;
}

.reset-answer {
  margin-left: 15px;
  background: none;
  text-align: left;
  color: white;
  /* font-style: italic; */
  font-weight: lighter;
  border: none;
  cursor: pointer;
}


.design-btn {
  padding: 14px 30px;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  color: white;
  border: none;
  border-radius: 15px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 5px 15px rgba(247, 37, 133, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.design-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(247, 37, 133, 0.4);
  background: linear-gradient(135deg, var(--accent-light), var(--secondary-light));
}

.result {
  margin-top: 15px;
  padding: 15px;
  border-radius: 15px;
  font-weight: 600;
  text-align: center;
  display: none;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  font-size: clamp(0.95rem, 1.5vw, 1rem);
}

.correct {
  display: block;
  background: rgba(6, 214, 160, 0.2);
  border: 1px solid rgba(6, 214, 160, 0.3);
}

.incorrect {
  display: block;
  background: rgba(255, 107, 107, 0.2);
  border: 1px solid rgba(255, 107, 107, 0.3);
}

/* Оригинален стил за големи екрани */
.real-life {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin: 50px 0;
}

@media (max-width: 1200px) {
  .real-life {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-color: white white;
    scrollbar-width: thin;
    padding: 10px 20px 25px;
    margin: 40px -20px;
    -webkit-overflow-scrolling: touch;
  }

  .real-life::-webkit-scrollbar {
    height: 8px;
    background-color: lightgray;
  }

  .real-life::-webkit-scrollbar-thumb {
    background-color: white;
    border-radius: 4px;
    border: 1px solid rgba(0, 0, 0, 0.1);
  }

  .real-life::-webkit-scrollbar-track {
    background-color: rgba(0, 0, 0, 0.05);
  }

  .real-life .life-card {
    flex: 0 0 300px;
    margin-right: 5px;
    animation: none !important;
  }

  .real-life .life-card:last-child {
    margin-right: 0;
  }
}

.life-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.life-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.card-icon {
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  color: white;
}

.card-content {
  padding: 25px;
  flex-grow: 1;
}

.life-card h3 {
  font-size: clamp(1.3rem, 2vw, 1.5rem);
  margin-bottom: 15px;
  color: var(--primary);
  line-height: 1.3;
}

.life-card p {
  font-size: clamp(0.95rem, 1.5vw, 1rem);
  color: var(--dark);
}



/* Добавени стилове за страниците на картата */
.card-main,
.card-second-page {
  transition: transform 0.5s ease;
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: white;
}

.card-second-page {
  transform: rotateY(180deg);
  display: none;
}

.life-card {
  position: relative;
  perspective: 1000px;
  transform-style: preserve-3d;
  min-height: 400px;
  /* Задаваме минимална височина за картата */
}

.life-card.flipped .card-main {
  transform: rotateY(180deg);
  display: none;
}

.life-card.flipped .card-second-page {
  transform: rotateY(0deg);
  display: block;
}

.card-toggle-btn {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: none;
  border: none;
  color: var(--primary);
  outline: none;
}

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

.card-toggle-btn i {
  transition: transform 0.3s ease;
}

.life-card.flipped .card-toggle-btn i {
  transform: rotate(180deg);
}




/* Footer */
footer {
  background: var(--darker);
  color: white;
  padding: 60px 0 30px;
  border-radius: 40px 40px 0 0;
  margin-top: 70px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
}

.footer-section h3 {
  font-size: clamp(1.3rem, 2vw, 1.5rem);
  margin-bottom: 20px;
  color: var(--accent);
  position: relative;
  padding-bottom: 10px;
}

.footer-section h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(to right, var(--accent), var(--primary));
  border-radius: 3px;
}

.footer-section p {
  opacity: 0.8;
  margin-bottom: 15px;
  font-size: clamp(0.9rem, 1.5vw, 1rem);
  line-height: 1.6;
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 1.2rem;
  transition: var(--transition);
}

.social-links a:hover {
  background: var(--accent);
  transform: translateY(-5px);
}

.copyright {
  text-align: center;
  padding-top: 30px;
  margin-top: 50px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.875;
  font-size: clamp(0.9rem, 1.5vw, 1rem);
}

.section-title {
  text-align: center;
  margin: 60px 0 40px;
  color: white;
  font-weight: 700;
  line-height: 1.125;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  position: relative;
  /* text-shadow:
    -1px -1px 0 rgb(29, 29, 29),
    1px -1px 0 rgb(29, 29, 29),
    -1px 1px 0 rgb(29, 29, 29),
    1px 1px 0 rgb(29, 29, 29); */
}

.section-title i {
  margin-right: 15px;
  background: wheat;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-title::after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--accent));
  margin: 15px auto 0;
  border-radius: 2px;
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

/* Responsive Design */
@media (max-width: 992px) {
  .reaction-viz {
    flex-direction: column;
    gap: 50px;
  }

  .electron-flow {
    width: 4px;
    height: 60%;
    top: 50%;
    left: 50%;
    background: linear-gradient(transparent, var(--accent), transparent);
  }
}

@media (max-width: 768px) {
  header {
    padding: 100px 0 60px;
    border-radius: 0 0 30px 30px;
  }

  .logo {
    font-size: 1.5rem;
    padding: 12px 20px;
  }

  .test-section {
    padding: 30px 20px;
  }

  .input-group {
    flex-direction: column;
    gap: 10px;
  }

  .input-group input {
    width: 100%;
  }
}

@media (max-width: 576px) {
  header {
    border-radius: 0 0 25px 25px;
  }

  .logo {
    font-size: 1.2rem;
    flex-direction: column;
    gap: 10px;
    padding: 15px;
  }

  .card {
    padding: 25px 20px;
  }

  .life-card {
    max-width: 350px;
    margin: 0 auto;
  }

  .question {
    padding: 20px;
  }

  footer {
    border-radius: 30px 30px 0 0;
  }
}