/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #6c5ce7;
  --primary-light: #a29bfe;
  --secondary: #00cec9;
  --accent: #fd79a8;
  --success: #00b894;
  --warning: #fdcb6e;
  --danger: #e17055;
  --bg: #f8f9ff;
  --bg-alt: #eef0ff;
  --text: #2d3436;
  --text-light: #636e72;
  --white: #ffffff;
  --shadow: 0 4px 20px rgba(108, 92, 231, 0.15);
  --shadow-hover: 0 8px 30px rgba(108, 92, 231, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-light);
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--bg-alt);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text);
  border-radius: 3px;
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg-alt) 100%);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 40px;
}

.hero-content {
  flex: 1;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 32px;
  max-width: 500px;
}

.hero-illustration {
  flex: 1;
  display: flex;
  justify-content: center;
}

.floating-letters {
  display: flex;
  gap: 16px;
  font-size: 4rem;
  font-weight: 800;
}

.float-letter {
  color: var(--primary);
  animation: float 3s ease-in-out infinite;
  animation-delay: var(--delay);
  text-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.float-letter:nth-child(2) { color: var(--secondary); }
.float-letter:nth-child(3) { color: var(--accent); }
.float-letter:nth-child(4) { color: var(--success); }
.float-letter:nth-child(5) { color: var(--warning); }

@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-20px) translateX(var(--x)); }
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  box-shadow: var(--shadow);
}

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

/* ===== Sections ===== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-light);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

/* ===== Alphabet Grid ===== */
.alphabet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.letter-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  user-select: none;
}

.letter-card:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-hover);
}

.letter-card:active {
  transform: scale(0.95);
}

.letter-card.playing {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
}

.letter-card .letter {
  font-size: 2.5rem;
  font-weight: 800;
  display: block;
}

.letter-card .sound {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 4px;
}

.letter-card.playing .sound {
  color: rgba(255, 255, 255, 0.8);
}

/* ===== Blends Grid ===== */
.blends-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.blend-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

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

.blend-card .blend {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}

.blend-card .example {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 8px;
}

.blend-card .example strong {
  color: var(--accent);
}

/* ===== Practice ===== */
.practice-card {
  max-width: 600px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  text-align: center;
}

.practice-prompt {
  margin-bottom: 30px;
}

.practice-sound {
  font-size: 4rem;
  display: block;
  margin-bottom: 10px;
  cursor: pointer;
  transition: var(--transition);
}

.practice-sound:hover {
  transform: scale(1.1);
}

.practice-prompt p {
  font-size: 1.1rem;
  color: var(--text-light);
}

.practice-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.option-btn {
  padding: 16px;
  font-size: 1.5rem;
  font-weight: 800;
  font-family: inherit;
  border: 3px solid var(--bg-alt);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
  transition: var(--transition);
}

.option-btn:hover {
  border-color: var(--primary);
  background: var(--bg-alt);
}

.option-btn.correct {
  border-color: var(--success);
  background: rgba(0, 184, 148, 0.1);
  color: var(--success);
}

.option-btn.wrong {
  border-color: var(--danger);
  background: rgba(225, 112, 85, 0.1);
  color: var(--danger);
}

.practice-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.score-display {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}

.practice-feedback {
  margin-top: 16px;
  font-size: 1.2rem;
  font-weight: 700;
  min-height: 30px;
}

/* ===== Footer ===== */
.footer {
  background: var(--text);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 32px 0;
  font-size: 0.9rem;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.company-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: 2px;
}

.footer a {
  color: var(--primary-light);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* ===== About Section ===== */
.about-card {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  line-height: 1.8;
}

.about-card p {
  margin-bottom: 16px;
  color: var(--text-light);
  font-size: 1.05rem;
}

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

.about-card strong {
  color: var(--primary);
}

/* ===== Contact Section ===== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.contact-info-card,
.contact-form-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.contact-table {
  width: 100%;
  border-collapse: collapse;
}

.contact-table tr {
  border-bottom: 1px solid var(--bg-alt);
}

.contact-table tr:last-child {
  border-bottom: none;
}

.contact-table td {
  padding: 14px 8px;
  font-size: 1rem;
}

.contact-label {
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  width: 120px;
}

.contact-table a {
  color: var(--primary);
  text-decoration: none;
}

.contact-table a:hover {
  text-decoration: underline;
}

/* ===== Contact Form ===== */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.required {
  color: var(--danger);
  font-weight: 800;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--bg-alt);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.form-group textarea {
  resize: vertical;
}

/* ===== Success Dialog ===== */
.dialog-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 2000;
  justify-content: center;
  align-items: center;
}

.dialog-overlay.show {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.dialog-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  animation: slideUp 0.3s ease;
}

.dialog-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.dialog-card h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--success);
  margin-bottom: 8px;
}

.dialog-card p {
  color: var(--text-light);
  margin-bottom: 24px;
  font-size: 1rem;
}

.dialog-card .btn {
  width: auto;
  min-width: 120px;
}

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

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

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 992px) {
  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .about-card {
    padding: 30px;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .nav.open {
    display: flex;
  }

  .nav-link {
    padding: 12px 16px;
    border-bottom: 1px solid var(--bg-alt);
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  /* Hero */
  .hero {
    padding: 100px 0 40px;
    min-height: auto;
  }

  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
    font-size: 1rem;
  }

  .floating-letters {
    font-size: 2.5rem;
  }

  /* Sections */
  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 24px;
  }

  /* Alphabet */
  .alphabet-grid {
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 10px;
  }

  .letter-card {
    padding: 14px;
  }

  .letter-card .letter {
    font-size: 1.8rem;
  }

  /* Blends */
  .blends-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  /* Practice */
  .practice-card {
    padding: 24px;
  }

  .practice-sound {
    font-size: 3rem;
  }

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

  .option-btn {
    padding: 12px;
    font-size: 1.2rem;
  }

  /* About */
  .about-card {
    padding: 24px;
  }

  .about-card p {
    font-size: 0.95rem;
  }

  /* Contact */
  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .contact-info-card,
  .contact-form-card {
    padding: 24px;
  }

  .contact-table td {
    padding: 10px 6px;
    font-size: 0.9rem;
  }

  .contact-label {
    width: auto;
  }

  /* Footer */
  .footer {
    padding: 24px 0;
  }

  .company-name {
    font-size: 1.2rem;
  }

  /* Buttons */
  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
    width: 100%;
    text-align: center;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .header .container {
    height: 60px;
  }

  .logo {
    font-size: 1.2rem;
  }

  .hero {
    padding: 80px 0 30px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

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

  .floating-letters {
    font-size: 2rem;
    gap: 10px;
  }

  .alphabet-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }

  .letter-card {
    padding: 10px;
  }

  .letter-card .letter {
    font-size: 1.5rem;
  }

  .letter-card .sound {
    font-size: 0.7rem;
  }

  .blends-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .blend-card {
    padding: 16px 10px;
  }

  .blend-card .blend {
    font-size: 1.4rem;
  }

  .practice-card {
    padding: 16px;
  }

  .practice-sound {
    font-size: 2.5rem;
  }

  .option-btn {
    padding: 10px;
    font-size: 1rem;
  }

  .score-display {
    font-size: 1rem;
  }

  .practice-feedback {
    font-size: 1rem;
  }

  .about-card {
    padding: 20px;
  }

  .contact-info-card,
  .contact-form-card {
    padding: 16px;
  }

  .form-group input,
  .form-group textarea {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .footer {
    font-size: 0.8rem;
  }
}