/* ============================================
   Unified Website Styles
   Mustafa Abdul Haque - Tutoring Resources
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:wght@400;500;600;700&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

/* CSS Variables */
:root {
  --color-dark-green: #17320b;
  --color-medium-green: #4c6b3c;
  --color-white: #ffffff;
  --color-light-gray: #d9dcd6;
  --color-gold: #a38f5a;

  --font-heading: 'EB Garamond', Georgia, serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --shadow-sm: 0 1px 3px rgba(23, 50, 11, 0.1);
  --shadow-md: 0 4px 12px rgba(23, 50, 11, 0.12);
  --shadow-lg: 0 8px 24px rgba(23, 50, 11, 0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-dark-green);
  background-color: var(--color-white);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-dark-green);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-dark-green);
}

a {
  color: var(--color-medium-green);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-gold);
}

/* Site Header */
.site-header {
  background: var(--color-dark-green);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-logo {
  height: 40px;
  width: auto;
}

.site-logo img {
  height: 100%;
  width: auto;
  filter: drop-shadow(0 0 1px var(--color-white)) drop-shadow(0 0 1px var(--color-white));
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.site-nav a {
  color: var(--color-light-gray);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-white);
  border-bottom-color: var(--color-gold);
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  min-height: calc(100vh - 200px);
}

.page-title {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-light-gray);
}

.page-title h1 {
  color: var(--color-dark-green);
  margin-bottom: 0.5rem;
}

.page-title .subtitle {
  font-family: var(--font-body);
  font-size: 1.1rem;
  color: var(--color-medium-green);
  font-weight: 400;
}

/* Cards */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-medium-green);
}

.card-accent {
  border-left: 4px solid var(--color-gold);
}

/* Link Cards / Navigation Cards */
.link-card {
  display: block;
  background: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
  transition: all var(--transition);
  text-decoration: none;
}

.link-card:hover {
  background: var(--color-light-gray);
  border-color: var(--color-medium-green);
  transform: translateX(4px);
}

.link-card h3,
.link-card span {
  color: var(--color-dark-green);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.1rem;
}

.link-card:hover h3,
.link-card:hover span {
  color: var(--color-medium-green);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--color-dark-green);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-medium-green);
  border: 2px solid var(--color-medium-green);
}

.btn-secondary:hover {
  background: var(--color-light-gray);
  color: var(--color-dark-green);
  border-color: var(--color-dark-green);
}

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

.btn-gold:hover {
  background: #8a7849;
  transform: translateY(-1px);
}

/* Form Elements */
input[type="text"],
input[type="number"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-dark-green);
  background: var(--color-white);
  border: 2px solid var(--color-light-gray);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-medium-green);
  box-shadow: 0 0 0 3px rgba(76, 107, 60, 0.1);
}

input.correct {
  border-color: var(--color-medium-green);
  background: rgba(76, 107, 60, 0.05);
}

input.incorrect {
  border-color: #c44536;
  background: rgba(196, 69, 54, 0.05);
}

/* Tabs */
.tab-container {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--color-light-gray);
}

.tab {
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  background: transparent;
  border: none;
  color: var(--color-medium-green);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
}

.tab:hover {
  color: var(--color-dark-green);
  background: var(--color-light-gray);
}

.tab.active {
  color: var(--color-dark-green);
  border-bottom-color: var(--color-gold);
}

.tab-content {
  display: none;
}

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

/* Info Boxes */
.info-box {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1rem 0;
}

.info-box-primary {
  background: rgba(76, 107, 60, 0.1);
  border-left: 4px solid var(--color-medium-green);
}

.info-box-gold {
  background: rgba(163, 143, 90, 0.15);
  border-left: 4px solid var(--color-gold);
}

.info-box-light {
  background: var(--color-light-gray);
  border-left: 4px solid var(--color-dark-green);
}

/* Section Headers */
.section-header {
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-light-gray);
}

.section-header h2 {
  color: var(--color-dark-green);
  margin-bottom: 0.25rem;
}

.section-header p {
  color: var(--color-medium-green);
  font-size: 0.95rem;
  margin: 0;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: 1rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Collapsible Sections */
.collapsible-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--color-light-gray);
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition);
}

.collapsible-header:hover {
  background: #c9cec3;
}

.collapsible-header h3 {
  font-size: 1rem;
  margin: 0;
}

.collapsible-header::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-medium-green);
}

.collapsible-header.open::after {
  content: '-';
}

.collapsible-content {
  display: none;
  padding: 1rem;
  background: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.collapsible-content.show {
  display: block;
}

/* Problem/Quiz Styles */
.problem {
  background: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1rem 0;
}

.problem-number {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-gold);
  font-size: 1.1rem;
}

.problem-text {
  font-size: 1.05rem;
  color: var(--color-dark-green);
  margin: 0.5rem 0;
}

/* Fraction Display */
.fraction {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  margin: 0 0.5rem;
  vertical-align: middle;
}

.fraction-num,
.fraction-den {
  padding: 0.25rem 0.5rem;
}

.fraction-line {
  width: 100%;
  height: 2px;
  background: var(--color-dark-green);
}

/* Conversion Setup */
.conversion-setup {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 0;
  font-size: 1.1rem;
}

.times {
  font-size: 1.2rem;
  color: var(--color-medium-green);
}

.equals {
  font-size: 1.2rem;
  color: var(--color-medium-green);
  margin-left: 0.5rem;
}

/* Solution Display */
.solution {
  display: none;
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(163, 143, 90, 0.1);
  border-left: 4px solid var(--color-gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.solution.show {
  display: block;
}

.solution-label {
  font-weight: 600;
  color: var(--color-gold);
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-light-gray);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-medium-green), var(--color-gold));
  border-radius: 4px;
  transition: width 0.3s ease;
}

/* Quiz Options */
.quiz-option {
  display: block;
  width: 100%;
  padding: 1rem 1.25rem;
  margin-bottom: 0.5rem;
  background: var(--color-white);
  border: 2px solid var(--color-light-gray);
  border-radius: var(--radius-sm);
  text-align: left;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-dark-green);
  cursor: pointer;
  transition: all var(--transition);
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--color-medium-green);
  background: rgba(76, 107, 60, 0.05);
}

.quiz-option.correct {
  border-color: var(--color-medium-green);
  background: rgba(76, 107, 60, 0.15);
}

.quiz-option.incorrect {
  border-color: #c44536;
  background: rgba(196, 69, 54, 0.1);
}

.quiz-option.disabled {
  cursor: default;
  pointer-events: none;
}

/* Feedback */
.feedback {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1rem 0;
}

.feedback-correct {
  background: rgba(76, 107, 60, 0.15);
  border: 1px solid var(--color-medium-green);
  color: var(--color-dark-green);
}

.feedback-incorrect {
  background: rgba(196, 69, 54, 0.1);
  border: 1px solid #c44536;
  color: #8b3228;
}

/* Stats Display */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 1.5rem;
  background: var(--color-light-gray);
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
}

.stat {
  text-align: center;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-dark-green);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-medium-green);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Footer */
.site-footer {
  background: var(--color-dark-green);
  color: var(--color-light-gray);
  padding: 1.5rem 2rem;
  text-align: center;
  margin-top: auto;
}

.site-footer p {
  color: var(--color-light-gray);
  font-size: 0.9rem;
  margin: 0;
}

.site-footer a {
  color: var(--color-gold);
}

.site-footer a:hover {
  color: var(--color-white);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 768px) {
  .site-header {
    padding: 1rem;
  }

  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .main-content {
    padding: 1rem;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .stats-bar {
    flex-direction: column;
    gap: 1rem;
  }

  .conversion-setup {
    font-size: 0.95rem;
  }

  .tab-container {
    flex-wrap: wrap;
  }

  .tab {
    flex: 1;
    min-width: 100px;
    text-align: center;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .btn,
  .site-nav {
    display: none;
  }

  .main-content {
    padding: 0;
    max-width: none;
  }

  body {
    background: white;
    color: black;
  }
}