@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
  --bg-primary: #F4F1DE;
  --bg-secondary: #EFEBE0;
  --text-main: #3D405B;
  --text-muted: #6C757D;
  --accent: #E07A5F;
  --accent-hover: #C9664B;
  --accent-light: #F9EAE6;
  --secondary: #3D405B;
  --secondary-light: #ECEBF0;
  --success: #81B29A;
  --success-light: #EBF3EF;
  --error: #D95F5F;
  --error-light: #FAECEC;
  --card-bg: #FFFFFF;
  
  --font-family: 'Outfit', sans-serif;
  --border-radius: 20px;
  --border-radius-sm: 10px;
  --transition-speed: 0.3s;
  
  --shadow: 0 10px 30px rgba(61, 64, 91, 0.06);
  --shadow-hover: 0 15px 35px rgba(61, 64, 91, 0.12);
  --max-width: 1050px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  padding-bottom: 80px;
}

header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px;
}

/* Navigation Bar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  padding: 15px 30px;
  border-radius: 50px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 20px;
  z-index: 100;
  border: 1px solid rgba(255, 255, 255, 0.5);
  margin-bottom: 40px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo svg {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 15px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 30px;
  transition: all var(--transition-speed);
}

.nav-link:hover {
  background-color: var(--accent-light);
  color: var(--accent);
}

.nav-link.active {
  background-color: var(--accent);
  color: white;
}

/* Hero Section */
.hero {
  max-width: var(--max-width);
  margin: 0 auto 50px;
  padding: 0 20px;
}

.hero-banner {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  min-height: 380px;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.hero-content {
  padding: 50px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.badge {
  background-color: var(--accent-light);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-content h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 15px;
  color: var(--secondary);
}

.hero-content p {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 25px;
  max-width: 420px;
}

.hero-image {
  background-size: cover;
  background-position: center;
  min-height: 100%;
}

/* Sections General */
.section {
  max-width: var(--max-width);
  margin: 0 auto 60px;
  padding: 0 20px;
  scroll-margin-top: 100px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title svg {
  color: var(--accent);
}

.section-desc {
  color: var(--text-muted);
  font-size: 15px;
  margin-bottom: 30px;
}

/* Vocabulary Grid & Cards */
.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 20px;
}

.vocab-card {
  perspective: 1000px;
  height: 200px;
  cursor: pointer;
}

.vocab-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform-style: preserve-3d;
}

.vocab-card.flipped .vocab-card-inner {
  transform: rotateY(180deg);
}

.vocab-card-front, .vocab-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background-color: var(--card-bg);
}

.vocab-card-front {
  color: var(--text-main);
  transition: box-shadow var(--transition-speed);
}

.vocab-card:hover .vocab-card-front {
  box-shadow: var(--shadow-hover);
}

.vocab-icon-wrapper {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--accent-light);
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 15px;
  color: var(--accent);
}

.vocab-word {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 5px;
}

.vocab-ipa {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}

.vocab-card-back {
  background-color: var(--secondary);
  color: white;
  transform: rotateY(180deg);
  justify-content: space-between;
}

.vocab-translation {
  font-size: 17px;
  font-weight: 500;
  color: var(--bg-primary);
  margin-top: 15px;
}

.vocab-example {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
  font-style: italic;
  line-height: 1.4;
  margin-bottom: 10px;
}

.vocab-card-tip {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent);
}

/* Dream Vacation Planner */
.planner-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 30px;
  background-color: var(--card-bg);
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.planner-options {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.planner-group-title {
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.planner-group-title svg {
  width: 16px;
  height: 16px;
}

.planner-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.planner-chip {
  background-color: var(--secondary-light);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-speed);
}

.planner-chip:hover {
  background-color: var(--accent-light);
  color: var(--accent);
}

.planner-chip.active {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 10px rgba(224, 122, 95, 0.2);
}

.planner-result {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(61, 64, 91, 0.1);
  padding-bottom: 12px;
}

.result-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--secondary);
}

.lang-toggle-btn {
  background: white;
  border: 1px solid rgba(61, 64, 91, 0.15);
  padding: 6px 12px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-main);
  transition: all var(--transition-speed);
}

.lang-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.result-text-container {
  min-height: 140px;
}

.result-text {
  font-size: 17px;
  color: var(--text-main);
  line-height: 1.6;
  font-style: italic;
}

.result-text.ru {
  font-size: 15px;
  color: var(--text-muted);
}

.planner-action {
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
  margin-top: 20px;
}

/* Quiz Section */
.quiz-container {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 40px;
  box-shadow: var(--shadow);
  max-width: 800px;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

.quiz-progress-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

.quiz-progress-bar {
  flex-grow: 1;
  height: 8px;
  background-color: var(--secondary-light);
  border-radius: 4px;
  margin: 0 20px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background-color: var(--accent);
  width: 0%;
  transition: width 0.4s ease;
}

.quiz-score-badge {
  background-color: var(--secondary-light);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--secondary);
}

.quiz-question-card {
  margin-bottom: 30px;
}

.quiz-question {
  font-size: 20px;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 20px;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option {
  background-color: white;
  border: 1.5px solid var(--secondary-light);
  padding: 16px 24px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  transition: all var(--transition-speed);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-main);
}

.quiz-option:hover {
  background-color: var(--bg-primary);
  border-color: rgba(61, 64, 91, 0.3);
}

.quiz-option.correct {
  background-color: var(--success-light);
  border-color: var(--success);
  color: #3f6854;
  font-weight: 600;
}

.quiz-option.incorrect {
  background-color: var(--error-light);
  border-color: var(--error);
  color: #b04646;
}

.quiz-option-status-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.quiz-option-status-icon svg {
  width: 20px;
  height: 20px;
}

/* Explanation Box */
.quiz-explanation {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--accent);
  padding: 20px 25px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin-bottom: 30px;
  display: none;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.explanation-title {
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 8px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.explanation-body {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.5;
}

.explanation-translation {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed rgba(61, 64, 91, 0.15);
  font-size: 13.5px;
  color: var(--text-muted);
  font-style: italic;
}

/* Navigation Buttons */
.quiz-footer {
  display: flex;
  justify-content: flex-end;
}

.quiz-btn {
  background-color: var(--accent);
  color: white;
  border: none;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(224, 122, 95, 0.2);
  transition: all var(--transition-speed);
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
}

.quiz-btn:disabled {
  background-color: var(--text-muted);
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Score Screen */
.quiz-score-screen {
  text-align: center;
  padding: 30px 10px;
  display: none;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background-color: var(--accent-light);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 0 auto 30px;
  border: 4px solid var(--accent);
  box-shadow: 0 6px 20px rgba(224, 122, 95, 0.15);
}

.score-num {
  font-size: 42px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}

.score-total {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.score-heading {
  font-size: 24px;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 10px;
}

.score-feedback {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 30px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* Responsive Styles */
@media (max-width: 900px) {
  .hero-banner {
    grid-template-columns: 1fr;
  }
  
  .hero-image {
    min-height: 250px;
  }
  
  .planner-container {
    grid-template-columns: 1fr;
    padding: 25px;
  }
  
  .planner-result {
    margin-top: 10px;
  }
}

@media (max-width: 600px) {
  header {
    padding: 10px;
  }
  
  .navbar {
    flex-direction: column;
    gap: 15px;
    padding: 15px 20px;
    border-radius: 25px;
  }
  
  .hero-content {
    padding: 30px 20px;
  }
  
  .hero-content h1 {
    font-size: 28px;
  }
  
  .quiz-container {
    padding: 20px;
  }
  
  .quiz-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  
  .quiz-progress-bar {
    margin: 0;
    width: 100%;
  }
}

/* Step-by-step sequential opening */
.step-btn-container {
  display: flex;
  justify-content: center;
  margin-top: 40px;
  margin-bottom: 20px;
}

.locked-section {
  display: none !important;
  opacity: 0;
}

.unlocked-section {
  display: block !important;
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

.nav-link.disabled {
  opacity: 0.45;
  pointer-events: none;
  cursor: not-allowed;
}

/* Questionnaire & Writing Prompt */
.questionnaire-container {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 40px;
  box-shadow: var(--shadow);
  max-width: 850px;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.quest-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

.quest-progress-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

.quest-progress-bar {
  flex-grow: 1;
  height: 8px;
  background-color: var(--secondary-light);
  border-radius: 4px;
  margin: 0 20px;
  overflow: hidden;
}

.quest-progress-fill {
  height: 100%;
  background-color: var(--accent);
  width: 12.5%;
  transition: width 0.4s ease;
}

.quest-step-card {
  margin-bottom: 20px;
  animation: fadeIn 0.4s ease-in-out;
}

.quest-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 20px;
}

.quest-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}

@media (max-width: 600px) {
  .quest-options {
    grid-template-columns: 1fr;
  }
}

.quest-option {
  background-color: white;
  border: 1.5px solid var(--secondary-light);
  padding: 20px 24px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  text-align: center;
  transition: all var(--transition-speed);
  color: var(--text-main);
}

.quest-option:hover {
  background-color: var(--bg-primary);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* Summary and Essay Section */
.summary-essay-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 30px;
  margin-top: 20px;
  animation: fadeIn 0.5s ease-in-out;
}

@media (max-width: 768px) {
  .summary-essay-layout {
    grid-template-columns: 1fr;
  }
}

.summary-card {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius-sm);
  padding: 25px;
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.summary-heading {
  font-size: 17px;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 15px;
  border-bottom: 1px solid rgba(61, 64, 91, 0.1);
  padding-bottom: 8px;
}

.summary-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.summary-item {
  font-size: 13.5px;
  color: var(--text-main);
  line-height: 1.4;
}

.summary-item strong {
  color: var(--accent);
}

.essay-card {
  display: flex;
  flex-direction: column;
}

.essay-instruction {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 15px;
  line-height: 1.5;
}

.essay-textarea {
  width: 100%;
  height: 160px;
  padding: 15px;
  border-radius: var(--border-radius-sm);
  border: 1.5px solid var(--secondary-light);
  font-family: var(--font-family);
  font-size: 14.5px;
  resize: vertical;
  margin-bottom: 15px;
  transition: border-color var(--transition-speed);
  outline: none;
  background-color: #FAFAFA;
}

.essay-textarea:focus {
  border-color: var(--accent);
  background-color: #FFFFFF;
}

.submission-feedback {
  background-color: var(--success-light);
  border-left: 4px solid var(--success);
  padding: 15px 20px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin-top: 15px;
  font-size: 14px;
  color: #3f6854;
  font-weight: 500;
  display: none; /* Controlled dynamically (flex/none) in JS */
  align-items: center;
  gap: 12px;
  animation: slideDown 0.3s ease-out;
}

/* Spinner Loader */
.spinner-loader {
  display: inline-block;
  min-width: 18px;
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(224, 122, 95, 0.25);
  border-radius: 50%;
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}

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