/* CSS Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #1a365d;
  --color-secondary: #2c5282;
  --color-accent: #ed8936;
  --color-accent-hover: #dd6b20;
  --color-bg: #f7fafc;
  --color-bg-alt: #edf2f7;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-border: #e2e8f0;
  --color-success: #48bb78;
  --color-error: #f56565;
  --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
  --max-width: 1100px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  --radius: 8px;
  --shadow: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3 {
  line-height: 1.3;
  color: var(--color-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; margin-bottom: var(--spacing-md); }
h3 { font-size: 1.25rem; margin-bottom: var(--spacing-sm); }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-secondary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header / Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  padding: var(--spacing-xxl) 0;
  text-align: center;
}

.hero h1 {
  color: white;
  margin-bottom: var(--spacing-sm);
  font-size: 3rem;
}

.tagline {
  font-size: 1.25rem;
  opacity: 0.9;
  margin: 0;
}

/* Navigation */
.main-nav {
  background: var(--color-primary);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.main-nav ul {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  list-style: none;
  flex-wrap: wrap;
}

.main-nav a {
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  transition: background 0.2s;
}

.main-nav a:hover {
  background: rgba(255,255,255,0.15);
  text-decoration: none;
}

/* Sections */
.section {
  padding: var(--spacing-xxl) 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

/* Info Box */
.info-box {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  padding: var(--spacing-lg);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--spacing-lg) 0;
}

.info-box h3 {
  color: var(--color-primary);
}

.info-box ul {
  margin: var(--spacing-md) 0 0 var(--spacing-lg);
}

.info-box li {
  margin-bottom: var(--spacing-sm);
}

/* Morse Code Grid */
.morse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.morse-grid-numbers {
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
}

.morse-grid-punct {
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

.morse-item {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.morse-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.morse-item.playing {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.morse-item .letter {
  display: block;
  font-size: 1.75rem;
  font-weight: bold;
  color: var(--color-primary);
}

.morse-item.playing .letter {
  color: white;
}

.morse-item .code {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
  letter-spacing: 2px;
}

.morse-item.playing .code {
  color: white;
}

.hint {
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-top: var(--spacing-sm);
}

/* Prosigns */
.prosign-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.prosign-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: white;
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.prosign-code {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  background: var(--color-bg-alt);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  letter-spacing: 1px;
}

/* Practice Tool */
.practice-tool {
  background: white;
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow);
  margin-top: var(--spacing-lg);
}

.practice-mode-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 2px solid var(--color-border);
  background: white;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
}

.tab-btn:hover {
  border-color: var(--color-secondary);
}

.tab-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.practice-panel {
  display: none;
}

.practice-panel.active {
  display: block;
}

.practice-panel label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.practice-panel input[type="text"] {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
}

.practice-panel input[type="text"]:focus {
  outline: none;
  border-color: var(--color-secondary);
}

.morse-output {
  background: var(--color-bg-alt);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 1.5rem;
  letter-spacing: 3px;
  min-height: 60px;
  word-break: break-all;
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.controls {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
}

.btn-secondary {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-border);
}

.btn-affiliate {
  background: var(--color-accent);
  color: white;
  display: inline-block;
  margin-top: var(--spacing-md);
}

.btn-affiliate:hover {
  background: var(--color-accent-hover);
  text-decoration: none;
}

.speed-control, .tone-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.tone-control {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

input[type="range"] {
  width: 150px;
  cursor: pointer;
}

/* Listen Mode */
.listen-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.feedback {
  padding: var(--spacing-md);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-md);
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.feedback.correct {
  background: #c6f6d5;
  color: #276749;
}

.feedback.incorrect {
  background: #fed7d7;
  color: #c53030;
}

.stats {
  display: flex;
  gap: var(--spacing-xl);
  font-size: 1.1rem;
}

/* Key Mode */
.key-container {
  display: flex;
  justify-content: center;
  margin: var(--spacing-xl) 0;
}

.morse-key {
  width: 150px;
  height: 80px;
  background: linear-gradient(180deg, #4a5568 0%, #2d3748 100%);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 6px 0 #1a202c, var(--shadow-lg);
  transition: all 0.1s;
  position: relative;
}

.morse-key:active,
.morse-key.pressed {
  transform: translateY(4px);
  box-shadow: 0 2px 0 #1a202c, var(--shadow);
}

.key-label {
  color: #a0aec0;
  font-weight: bold;
  font-size: 1.25rem;
}

.key-output {
  background: var(--color-bg-alt);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 1.5rem;
  letter-spacing: 3px;
  min-height: 50px;
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.decoded-output {
  text-align: center;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.decoded-output span {
  font-weight: bold;
  color: var(--color-primary);
}

/* Tip Cards */
.tip-card {
  background: white;
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color-secondary);
}

.tip-card h3 {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

.tip-card p {
  margin-bottom: 0;
}

.tip-card a {
  color: var(--color-accent);
}

.tip-card a:hover {
  color: var(--color-accent-hover);
}

/* Timing Table */
.timing-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.timing-table th,
.timing-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.timing-table th {
  background: var(--color-primary);
  color: white;
}

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

.timing-table tr:nth-child(even) {
  background: var(--color-bg-alt);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.product-card {
  background: white;
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.product-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.product-card p {
  flex-grow: 1;
}

.product-features {
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-style: italic;
}

/* Timeline */
.timeline {
  margin-top: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-lg);
  padding-left: var(--spacing-lg);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid white;
}

.timeline-item .year {
  font-weight: bold;
  color: var(--color-secondary);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.timeline-item p {
  margin: 0;
}

/* FAQ */
.faq-item {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.faq-item p {
  margin-bottom: 0;
  color: var(--color-text);
}

/* Footer */
footer {
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

footer p {
  margin-bottom: var(--spacing-sm);
  opacity: 0.9;
}

.affiliate-disclosure {
  font-size: 0.85rem;
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .main-nav ul {
    gap: var(--spacing-sm);
  }

  .main-nav a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
  }

  .morse-grid {
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--spacing-sm);
  }

  .morse-item {
    padding: var(--spacing-sm);
  }

  .morse-item .letter {
    font-size: 1.5rem;
  }

  .morse-item .code {
    font-size: 1rem;
  }

  .practice-tool {
    padding: var(--spacing-md);
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .speed-control {
    justify-content: space-between;
  }
}

@media (max-width: 480px) {
  .practice-mode-tabs {
    flex-direction: column;
  }

  .tab-btn {
    width: 100%;
  }

  .listen-controls {
    flex-direction: column;
  }

  .listen-controls .btn {
    width: 100%;
  }
}