/* ==========================================================================
   TraceMyLetter.com - Main Application Stylesheet
   ========================================================================== */

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

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Background playful pattern */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    radial-gradient(#e0e7ff 1.5px, transparent 1.5px),
    radial-gradient(#fed7aa 1.5px, transparent 1.5px);
  background-size: 48px 48px;
  background-position: 0 0, 24px 24px;
  opacity: 0.6;
  z-index: -1;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   Header & Brand Navigation
   -------------------------------------------------------------------------- */
.app-header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  cursor: pointer;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 10px rgba(88, 80, 236, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-bounce);
}

.brand:hover .brand-icon {
  transform: rotate(-6deg) scale(1.08);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-brand);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #4F46E5 0%, #EC4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}

.brand-tagline {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  align-items: center;
  background: var(--color-surface-soft);
  padding: 4px;
  border-radius: var(--radius-full);
  gap: 4px;
  border: 1px solid var(--color-border);
}

.nav-tab {
  font-family: var(--font-brand);
  font-size: 15px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.nav-tab:hover {
  color: var(--color-primary);
  background: rgba(255, 255, 255, 0.6);
}

.nav-tab.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.nav-tab .tab-icon {
  font-size: 17px;
}

/* Header Action Buttons */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.btn-sound {
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-sound:hover {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border-focus);
}

.star-counter {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #FFFBEB;
  border: 1.5px solid #FCD34D;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-family: var(--font-brand);
  font-size: 15px;
  font-weight: 700;
  color: #B45309;
  box-shadow: 0 2px 6px rgba(245, 158, 11, 0.15);
}

.star-counter span {
  font-size: 18px;
  animation: pulse-star 2s infinite ease-in-out;
}

@keyframes pulse-star {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15) rotate(8deg); }
}

/* --------------------------------------------------------------------------
   Layout Containers
   -------------------------------------------------------------------------- */
.main-container {
  max-width: 1240px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6) var(--space-6) var(--space-12);
  flex: 1;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   Buttons & UI Elements
   -------------------------------------------------------------------------- */
.btn {
  font-family: var(--font-brand);
  font-size: 15px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #6366F1 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(88, 80, 236, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, #4F46E5 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(88, 80, 236, 0.45);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent-coral) 0%, #F43F5E 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(255, 100, 130, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 100, 130, 0.4);
}

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

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

.btn-lg {
  font-size: 17px;
  padding: 14px 28px;
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   Cards & Panels
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  position: relative;
}

.card-kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.card-title {
  font-family: var(--font-brand);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

/* --------------------------------------------------------------------------
   Alphabet Selector Grid
   -------------------------------------------------------------------------- */
.alphabet-pills {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.pill-group {
  display: flex;
  background: var(--color-surface-soft);
  padding: 3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.pill-btn {
  font-family: var(--font-brand);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pill-btn.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.alphabet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(46px, 1fr));
  gap: 8px;
}

.letter-btn {
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-brand);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--transition-bounce);
}

.letter-btn:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.letter-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(88, 80, 236, 0.35);
  transform: scale(1.05);
}

.letter-btn.completed::after {
  content: "★";
  position: absolute;
  top: 2px;
  right: 3px;
  font-size: 10px;
  color: #F59E0B;
}

.letter-btn.active.completed::after {
  color: #FEF08A;
}

/* --------------------------------------------------------------------------
   Phonics Card (A is for Apple)
   -------------------------------------------------------------------------- */
.phonics-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(135deg, #F8FAFC 0%, #EEF2FF 100%);
  border-radius: var(--radius-lg);
  border: 1.5px solid #E0E7FF;
  margin-bottom: var(--space-4);
}

.phonics-illustration {
  width: 72px;
  height: 72px;
  background: white;
  border-radius: var(--radius-md);
  border: 1px solid #E2E8F0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 38px;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.phonics-text {
  flex: 1;
}

.phonics-letter-large {
  font-family: var(--font-brand);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.phonics-word-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.phonics-word {
  font-family: var(--font-brand);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.phonics-sub {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Custom Name Tracing Section
   -------------------------------------------------------------------------- */
.name-input-hero {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-8);
}

.name-input-hero h1 {
  font-family: var(--font-brand);
  font-size: 36px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.name-input-hero p {
  color: var(--color-text-muted);
  font-size: 16px;
}

.name-input-box {
  display: flex;
  gap: var(--space-3);
  max-width: 580px;
  margin: var(--space-5) auto 0;
  background: var(--color-surface);
  padding: 6px 8px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast);
}

.name-input-box:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-subtle);
}

.name-input-box input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-brand);
  font-size: 20px;
  padding: 8px 16px;
  color: var(--color-text);
  outline: none;
}

.name-preset-chips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

.preset-chip {
  font-family: var(--font-brand);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* --------------------------------------------------------------------------
   Worksheet Studio Controls & Preview
   -------------------------------------------------------------------------- */
.worksheet-studio-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-8);
  align-items: start;
}

.studio-options-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-family: var(--font-brand);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
}

.form-select, .form-input {
  font-family: var(--font-body);
  font-size: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-select:focus, .form-input:focus {
  border-color: var(--color-primary);
}

.form-checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}

.form-checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* Worksheet preview sheet */
.worksheet-preview-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.worksheet-page {
  width: 100%;
  max-width: 800px;
  background: #FFFFFF;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 0 0 1px #E2E8F0;
  padding: 44px 40px 36px;
  position: relative;
  page-break-after: always;
}

/* Worksheet Header inside sheet */
.sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 24px;
}

.sheet-title-group {
  flex: 1;
}

.sheet-sub {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #64748B;
  margin-bottom: 4px;
}

.sheet-main-title {
  font-family: var(--font-brand);
  font-size: 38px;
  font-weight: 700;
  color: #0F172A;
  line-height: 1.1;
}

.sheet-coloring-box {
  width: 110px;
  height: 110px;
  border: 1.5px dashed #94A3B8;
  border-radius: 12px;
  background: #F8FAFC;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8px;
}

.sheet-coloring-icon {
  font-size: 46px;
  line-height: 1;
}

.sheet-coloring-label {
  font-size: 11px;
  font-weight: 600;
  color: #64748B;
  margin-top: 4px;
}

.sheet-student-info {
  display: flex;
  align-items: flex-end;
  gap: 32px;
  margin-bottom: 32px;
  padding-bottom: 8px;
}

.sheet-info-field {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: 8px;
  border-bottom: 1.5px solid #CBD5E1;
  padding-bottom: 4px;
}

.sheet-info-label {
  font-family: var(--font-brand);
  font-size: 13px;
  font-weight: 600;
  color: #64748B;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Worksheet Rule Lines */
.sheet-guidelines-row {
  position: relative;
  height: 80px;
  margin-bottom: 28px;
  width: 100%;
}

.sheet-guidelines-row .line-headline {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  border-top: 1.5px solid #7DD3FC;
}

.sheet-guidelines-row .line-midline {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  border-top: 2px dashed #FCD34D;
}

.sheet-guidelines-row .line-baseline {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  border-top: 2px solid #34D399;
}

.sheet-guidelines-row .glyph-stream {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: stretch;
  gap: 16px;
  padding-left: 8px;
}

/* Footer watermark */
.sheet-watermark {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid #E2E8F0;
  padding-top: 12px;
  margin-top: 20px;
  font-size: 11px;
  color: #94A3B8;
  font-family: var(--font-brand);
}

/* --------------------------------------------------------------------------
   FAQ & Marketing Section
   -------------------------------------------------------------------------- */
.faq-section {
  margin-top: var(--space-12);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-10);
}

.faq-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.faq-header h2 {
  font-family: var(--font-brand);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-5);
}

.faq-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.faq-card h3 {
  font-family: var(--font-brand);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: 8px;
}

.faq-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* App Footer */
.app-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) var(--space-6);
  text-align: center;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: auto;
}

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

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .app-header {
    flex-wrap: wrap;
    padding: var(--space-3) var(--space-4);
  }
  
  .nav-tabs {
    order: 3;
    width: 100%;
    overflow-x: auto;
    justify-content: flex-start;
  }
  
  .worksheet-studio-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .brand-tagline {
    display: none;
  }
  
  .alphabet-grid {
    grid-template-columns: repeat(auto-fill, minmax(38px, 1fr));
    gap: 6px;
  }
  
  .letter-btn {
    height: 42px;
    font-size: 16px;
  }
}