/* ============================================
   Italian Course — Design System
   Colors: Italian flag green #008C45, red #CD212A
   ============================================ */

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

:root {
  --green: #008C45;
  --green-light: #e8f5ee;
  --red: #CD212A;
  --red-light: #fdeaeb;
  --white: #F4F5F0;
  --bg: #fafaf8;
  --text: #2c2c2c;
  --text-light: #666;
  --card-bg: #ffffff;
  --border: #e0e0dc;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ---- Layout ---- */

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---- Header / Hero ---- */

.site-header {
  background: linear-gradient(135deg, var(--green) 0%, #00a550 100%);
  color: #fff;
  padding: 2.5rem 0 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green) 33%, var(--white) 33%, var(--white) 66%, var(--red) 66%);
}

.site-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.site-header p {
  font-size: 1.05rem;
  opacity: 0.92;
}

.site-header a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---- Navigation ---- */

.nav-back {
  display: inline-block;
  margin: 1.25rem 0 0.5rem;
  color: var(--green);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-back:hover {
  text-decoration: underline;
}

/* ---- Lesson Cards (landing page) ---- */

.lesson-grid {
  display: grid;
  gap: 1.25rem;
  margin: 2rem 0;
}

.lesson-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
}

.lesson-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.lesson-card .week-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--green);
  margin-bottom: 0.25rem;
}

.lesson-card h2 {
  font-size: 1.3rem;
  margin-bottom: 0.35rem;
}

.lesson-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.lesson-card .topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.lesson-card .topic-tag {
  background: var(--green-light);
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
}

.lesson-card .btn {
  display: inline-block;
}

.lesson-card .progress-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--green);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
}

/* ---- Buttons ---- */

.btn {
  display: inline-block;
  background: var(--green);
  color: #fff;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}

.btn:hover {
  background: #007a3d;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  color: var(--green);
  border: 2px solid var(--green);
}

.btn-outline:hover {
  background: var(--green-light);
}

.btn-sm {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
}

/* ---- Lesson Page Sections ---- */

.lesson-hero {
  background: linear-gradient(135deg, var(--green) 0%, #00a550 100%);
  color: #fff;
  padding: 2rem 0 1.5rem;
  position: relative;
}

.lesson-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green) 33%, var(--white) 33%, var(--white) 66%, var(--red) 66%);
}

.lesson-hero .week-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.85;
  margin-bottom: 0.15rem;
}

.lesson-hero h1 {
  font-size: 1.8rem;
  margin-bottom: 0.25rem;
}

.lesson-hero p {
  opacity: 0.9;
  font-size: 1rem;
}

section.lesson-section {
  margin: 2rem 0;
}

section.lesson-section h2 {
  font-size: 1.3rem;
  color: var(--green);
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--green-light);
}

/* ---- Quick Review (collapsible) ---- */

.review-box {
  background: var(--green-light);
  border: 1px solid #b8e0ca;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
}

.review-box summary {
  font-weight: 700;
  color: var(--green);
  cursor: pointer;
  font-size: 0.95rem;
}

.review-box summary:hover {
  text-decoration: underline;
}

.review-box .review-content {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.7;
}

.review-box .review-content span.it {
  font-weight: 600;
  color: var(--green);
}

/* ---- Vocabulary Table ---- */

.vocab-grid {
  display: grid;
  gap: 0.6rem;
}

.vocab-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  align-items: center;
  box-shadow: var(--shadow);
}

.vocab-card .italian {
  font-weight: 700;
  font-size: 1.05rem;
}

.vocab-card .english {
  color: var(--text-light);
  font-size: 0.95rem;
}

.vocab-card .pronunciation {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  color: var(--text-light);
  font-style: italic;
  border-top: 1px solid var(--border);
  padding-top: 0.4rem;
  margin-top: 0.15rem;
}

/* ---- Phrases List ---- */

.phrases-list {
  list-style: none;
}

.phrases-list li {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin-bottom: 0.5rem;
  box-shadow: var(--shadow);
}

.phrases-list .it {
  font-weight: 700;
  display: block;
  font-size: 1.05rem;
}

.phrases-list .en {
  color: var(--text-light);
  font-size: 0.9rem;
}

.phrases-list .pron {
  font-size: 0.8rem;
  color: var(--text-light);
  font-style: italic;
}

/* ---- Numbers Grid ---- */

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  margin: 1rem 0;
}

.number-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.5rem;
  text-align: center;
  box-shadow: var(--shadow);
  cursor: default;
  transition: transform var(--transition);
}

.number-card:hover {
  transform: scale(1.05);
}

.number-card .digit {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green);
}

.number-card .word {
  font-size: 0.8rem;
  color: var(--text);
  margin-top: 0.15rem;
}

.number-card .pron {
  font-size: 0.7rem;
  color: var(--text-light);
  font-style: italic;
}

/* ---- Days Row ---- */

.days-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.day-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  text-align: center;
  box-shadow: var(--shadow);
  flex: 1;
  min-width: 100px;
}

.day-card .it {
  font-weight: 700;
  font-size: 0.95rem;
}

.day-card .en {
  font-size: 0.78rem;
  color: var(--text-light);
}

/* ---- Scenario / Dialogue Box ---- */

.dialogue-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--green);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1rem 0;
  box-shadow: var(--shadow);
}

.dialogue-box .scene {
  font-style: italic;
  color: var(--text-light);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.dialogue-line {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.dialogue-line .speaker {
  font-weight: 700;
  color: var(--green);
}

.dialogue-line .speaker.you {
  color: var(--red);
}

/* ---- Cultural Note ---- */

.cultural-note {
  background: #fef9e7;
  border: 1px solid #f0e4b8;
  border-left: 4px solid #d4a843;
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1.5rem 0;
}

.cultural-note h3 {
  font-size: 1rem;
  color: #8a6d1f;
  margin-bottom: 0.5rem;
}

.cultural-note p {
  font-size: 0.92rem;
  color: #5a4a1a;
  line-height: 1.6;
}

.cultural-note p + p {
  margin-top: 0.5rem;
}

/* ---- Fun Expressions ---- */

.expressions-grid {
  display: grid;
  gap: 0.6rem;
}

.expression-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  box-shadow: var(--shadow);
}

.expression-card .it {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--green);
}

.expression-card .en {
  color: var(--text-light);
  font-size: 0.9rem;
}

.expression-card .note {
  font-size: 0.8rem;
  color: var(--text-light);
  font-style: italic;
  margin-top: 0.25rem;
}

/* ============================================
   Exercises
   ============================================ */

.exercises-section {
  margin: 2.5rem 0;
  padding-top: 1.5rem;
  border-top: 3px solid var(--green-light);
}

.exercises-section > h2 {
  font-size: 1.3rem;
  color: var(--green);
  margin-bottom: 1.25rem;
}

.exercise-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.exercise-block h3 {
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.exercise-block .instruction {
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

/* -- Matching -- */

.matching-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1.5rem;
}

.match-item {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  text-align: center;
  font-weight: 600;
  font-size: 0.95rem;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  user-select: none;
}

.match-item:hover:not(.matched):not(.locked) {
  border-color: var(--green);
  background: var(--green-light);
  transform: scale(1.02);
}

.match-item.selected {
  border-color: var(--green);
  background: var(--green-light);
  box-shadow: 0 0 0 2px var(--green);
}

.match-item.matched {
  border-color: var(--green);
  background: var(--green-light);
  opacity: 0.7;
  cursor: default;
}

.match-item.wrong {
  border-color: var(--red);
  background: var(--red-light);
  animation: shake 0.4s ease;
}

/* -- Fill in the blank -- */

.fill-blank-text {
  font-size: 1.05rem;
  line-height: 2;
  margin-bottom: 1rem;
}

.fill-blank-text .blank {
  display: inline-block;
  min-width: 100px;
  border-bottom: 2px solid var(--green);
  padding: 0.15rem 0.5rem;
  margin: 0 0.15rem;
  text-align: center;
  font-weight: 700;
  color: var(--green);
  cursor: pointer;
  transition: background var(--transition);
  border-radius: 4px 4px 0 0;
}

.fill-blank-text .blank:hover {
  background: var(--green-light);
}

.fill-blank-text .blank.correct {
  border-color: var(--green);
  background: var(--green-light);
  color: var(--green);
}

.fill-blank-text .blank.wrong {
  border-color: var(--red);
  background: var(--red-light);
  color: var(--red);
  animation: shake 0.4s ease;
}

.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.word-bank .word-btn {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
  transition: border-color var(--transition), opacity var(--transition);
}

.word-bank .word-btn:hover:not(.used) {
  border-color: var(--green);
  background: var(--green-light);
}

.word-bank .word-btn.used {
  opacity: 0.35;
  cursor: default;
}

/* -- Multiple Choice -- */

.mc-options {
  display: grid;
  gap: 0.5rem;
}

.mc-option {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: border-color var(--transition), background var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mc-option:hover:not(.locked) {
  border-color: var(--green);
  background: var(--green-light);
}

.mc-option .mc-letter {
  font-weight: 700;
  color: var(--text-light);
  min-width: 1.5rem;
}

.mc-option.correct {
  border-color: var(--green);
  background: var(--green-light);
}

.mc-option.correct::after {
  content: "\2713";
  margin-left: auto;
  font-weight: 700;
  color: var(--green);
}

.mc-option.wrong {
  border-color: var(--red);
  background: var(--red-light);
}

.mc-option.wrong::after {
  content: "\2717";
  margin-left: auto;
  font-weight: 700;
  color: var(--red);
}

.mc-option.locked {
  cursor: default;
  opacity: 0.6;
}

.mc-option.correct.locked {
  opacity: 1;
}

.mc-explanation {
  margin-top: 0.75rem;
  font-size: 0.88rem;
  color: var(--text-light);
  padding: 0.6rem 0.85rem;
  background: var(--green-light);
  border-radius: 8px;
  display: none;
}

.mc-explanation.visible {
  display: block;
}

/* -- Ordering -- */

.ordering-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.order-item {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  user-select: none;
}

.order-item:hover:not(.locked) {
  border-color: var(--green);
  background: var(--green-light);
}

.order-item.selected {
  border-color: var(--green);
  background: var(--green-light);
  box-shadow: 0 0 0 2px var(--green);
}

.order-item.correct {
  border-color: var(--green);
  background: var(--green-light);
}

.order-item.wrong {
  border-color: var(--red);
  background: var(--red-light);
}

/* -- Exercise Feedback & Controls -- */

.exercise-controls {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  align-items: center;
}

.exercise-score {
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 600;
  margin-left: auto;
}

.exercise-score .score-correct {
  color: var(--green);
}

/* ---- Animations ---- */

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* ---- Footer ---- */

.site-footer {
  text-align: center;
  padding: 2rem 0;
  color: var(--text-light);
  font-size: 0.85rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

/* ---- Responsive ---- */

@media (max-width: 600px) {
  .site-header h1,
  .lesson-hero h1 {
    font-size: 1.5rem;
  }

  .numbers-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 0.35rem;
  }

  .number-card {
    padding: 0.5rem 0.25rem;
  }

  .number-card .digit {
    font-size: 1.1rem;
  }

  .matching-container {
    grid-template-columns: 1fr;
  }

  .vocab-card {
    grid-template-columns: 1fr;
  }

  .days-row {
    flex-direction: column;
  }

  .day-card {
    min-width: auto;
  }
}

/* ---- Lesson navigation footer ---- */

.lesson-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 2rem 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.lesson-nav a {
  color: var(--green);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.lesson-nav a:hover {
  text-decoration: underline;
}