/*
 * Grammar Index - Main Styles
 * Path: E:\OneDrive\CODING\APPS\Ultracirculum_Hub\ultracirculum.cloud\grammarindex\index.css
 * 
 * Main stylesheet for Grammar Index page
 */

/* Grammar Index - Complete Standalone Styles */
:root {
  --primary: #40c4ff;
  --primary-dark: #142739;
  --background: #00000F;
  --surface: rgba(15, 15, 40, 0.3);
  --on-surface: #e0e0e0;
  --grey: #b3c2cc;
  --divider: #263238;
  --card-radius: 8px;
  --shadow: 0 4px 12px rgba(64, 196, 255, 0.075), 0 2px 6px rgba(0, 0, 0, 0.2);
  --blur: blur(4px);
  --border-color: rgba(64, 196, 255, 0.2);
  --container-gap: 20px;
  --top-margin: 20px;
  --container-max-width: 1120px;
  
  /* Updated Category Colors (7 Categories - Fundamentals Removed) */
  --tenses-primary: #ff6b35;
  --tenses-bg: rgba(255, 107, 53, 0.1);
  --tenses-border: rgba(255, 107, 53, 0.3);
  --advanced-primary: #6200ea;
  --advanced-bg: rgba(98, 0, 234, 0.1);
  --advanced-border: rgba(98, 0, 234, 0.3);
  --modal-verbs-primary: #00bcd4;
  --modal-verbs-bg: rgba(0, 188, 212, 0.1);
  --modal-verbs-border: rgba(0, 188, 212, 0.3);
  --nouns-articles-primary: #2196f3;
  --nouns-articles-bg: rgba(33, 150, 243, 0.1);
  --nouns-articles-border: rgba(33, 150, 243, 0.3);
  --vocabulary-primary: #4caf50;
  --vocabulary-bg: rgba(76, 175, 80, 0.1);
  --vocabulary-border: rgba(76, 175, 80, 0.3);
  --communication-primary: #e91e63;
  --communication-bg: rgba(233, 30, 99, 0.1);
  --communication-border: rgba(233, 30, 99, 0.3);
  --conditionals-primary: #ffc107;
  --conditionals-bg: rgba(255, 193, 7, 0.1);
  --conditionals-border: rgba(255, 193, 7, 0.3);
}

html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: var(--background);
  color: var(--on-surface);
  font-size: 15px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated Backgrounds */
.stars, .fireflies, .fireflies-front {
  position: fixed;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  -webkit-user-select: none;
  user-select: none;
  display: block;
}

.fireflies { z-index: 1; }
.fireflies-front { z-index: 2; }

/* Container System */
.container {
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.navigation-wrap {
  max-width: var(--container-max-width);
  width: 100%;
  margin: var(--top-margin) auto;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--container-gap);
  position: relative;
  z-index: 1;
  box-sizing: border-box;
}

/* Navigation Header */
.top-navigation-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  padding: var(--container-gap);
  margin: var(--container-gap) var(--container-gap) 0 var(--container-gap);
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-sizing: border-box;
  position: relative;
}

.home-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(64, 196, 255, 0.1);
  border: 1px solid rgba(64, 196, 255, 0.3);
  border-radius: var(--card-radius);
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.home-btn:hover {
  background: rgba(64, 196, 255, 0.2);
  border-left-color: rgba(64, 196, 255, 0.5);
  margin-left: -2px;
  padding-left: 18px;
}

.home-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.home-btn:hover .home-icon {
  margin-left: -2px;
}

.header-copyright {
  font-size: 0.8125rem;
  text-align: center;
  opacity: 0.9;
  margin: 0;
  background: linear-gradient(180deg, #fbbf24, #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 500;
}

/* Copyright Footer */
.copyright-footer {
  margin: 20px var(--container-gap) 0 var(--container-gap);
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-sizing: border-box;
  padding: 15px 0;
  text-align: center;
}

.copyright-text {
  font-size: 0.8125rem;
  font-weight: 500;
  background: linear-gradient(180deg, #fbbf24, #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
}

/* Header Section - Shrunk for smaller logo */
.header-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 15px var(--container-gap);
  margin: 0 var(--container-gap);
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-sizing: border-box;
}

.logo-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.main-title-image {
  max-width: 240px;
  height: auto;
  object-fit: contain;
}

/* Search Container */
.search-container {
  position: relative;
  display: flex;
  align-items: center;
  margin: 0 var(--container-gap);
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-sizing: border-box;
}

.search-box {
  flex: 1;
  padding: 15px 20px;
  background: transparent;
  border: none;
  color: var(--on-surface);
  font-size: 16px;
  outline: none;
  border-radius: var(--card-radius);
}

.search-box::placeholder {
  color: var(--grey);
}

.search-icon {
  padding: 15px 20px;
  font-size: 18px;
  color: var(--grey);
}

/* Statistics Bar */
.stats-bar {
  margin: 0 var(--container-gap);
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-sizing: border-box;
  padding: var(--container-gap);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--container-gap);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2em;
  font-weight: 700;
  color: var(--primary);
  display: block;
  margin-bottom: 5px;
}

.stat-label {
  color: var(--grey);
  font-size: 0.9em;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Categories Grid - Multi-Column Masonry Layout */
.categories-grid {
  margin: 0 var(--container-gap) 0 var(--container-gap);
  column-count: 2;
  column-gap: 20px;
  column-fill: balance;
  margin-bottom: 0;
}

.category-card {
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  padding: var(--container-gap);
  box-sizing: border-box;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  break-inside: avoid;
  margin-bottom: 20px;
  width: 100%;
}

.category-card:hover {
  margin-top: -2px;
  padding-top: 22px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--divider);
  flex-shrink: 0;
}

.category-icon {
  font-size: 1.5em;
  flex-shrink: 0;
}

.category-title {
  font-size: 1.2em;
  font-weight: 600;
  margin: 0;
  flex: 1;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.topic-list {
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.topic-item {
  margin: 0;
  flex-shrink: 0;
}

.topic-link {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--on-surface);
  transition: all 0.3s ease;
  border-left: 3px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.topic-link:hover {
  background: rgba(64, 196, 255, 0.1);
  border-left-color: var(--primary);
  margin-left: 5px;
  padding-left: 7px;
}

/* Category-specific colors */
.category-card.tenses .category-title { color: var(--tenses-primary); }
.category-card.tenses .topic-link:hover { 
  background: var(--tenses-bg); 
  border-left-color: var(--tenses-primary); 
}

.category-card.modal-verbs .category-title { color: var(--modal-verbs-primary); }
.category-card.modal-verbs .topic-link:hover { 
  background: var(--modal-verbs-bg); 
  border-left-color: var(--modal-verbs-primary); 
}

.category-card.nouns-articles .category-title { color: var(--nouns-articles-primary); }
.category-card.nouns-articles .topic-link:hover { 
  background: var(--nouns-articles-bg); 
  border-left-color: var(--nouns-articles-primary); 
}

.category-card.vocabulary .category-title { color: var(--vocabulary-primary); }
.category-card.vocabulary .topic-link:hover { 
  background: var(--vocabulary-bg); 
  border-left-color: var(--vocabulary-primary); 
}

.category-card.communication .category-title { color: var(--communication-primary); }
.category-card.communication .topic-link:hover { 
  background: var(--communication-bg); 
  border-left-color: var(--communication-primary); 
}

.category-card.conditionals .category-title { color: var(--conditionals-primary); }
.category-card.conditionals .topic-link:hover { 
  background: var(--conditionals-bg); 
  border-left-color: var(--conditionals-primary); 
}

.category-card.advanced .category-title { color: var(--advanced-primary); }
.category-card.advanced .topic-link:hover { 
  background: var(--advanced-bg); 
  border-left-color: var(--advanced-primary); 
}

/* No Results */
.no-results {
  display: none;
  text-align: center;
  padding: 40px var(--container-gap);
  margin: 0 var(--container-gap);
  color: var(--grey);
  font-size: 1.1em;
  background: var(--surface);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-sizing: border-box;
}

/* Responsive Design - 2 Column Focus - Adjusted for smaller logo */
@media (max-width: 768px) {
  :root {
    --container-gap: 15px;
    --top-margin: 15px;
  }

  .header-wrap {
    padding: 12px 15px;
  }
  
  .header-copyright {
    font-size: 0.75rem;
  }
  
  .copyright-text {
    font-size: 0.75rem;
  }

  .main-title-image {
    max-width: 180px; /* 240px * 0.75 = 180px (25% smaller) */
  }

  .categories-grid {
    column-count: 1;
    gap: 15px;
  }

  .category-card {
    padding: 15px;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
  }

  .stat-number {
    font-size: 1.5em;
  }
}

@media (max-width: 480px) {
  .home-btn {
    padding: 6px 12px;
    font-size: 13px;
    gap: 6px;
  }

  .home-icon {
    width: 16px;
    height: 16px;
  }
  
  .header-copyright {
    font-size: 0.7rem;
  }
  
  .copyright-text {
    font-size: 0.75rem;
  }

  .search-box {
    padding: 12px 15px;
    font-size: 14px;
  }

  .header-wrap {
    padding: 10px 12px;
  }

  .main-title-image {
    max-width: 135px; /* 180px * 0.75 = 135px (25% smaller for small mobile) */
  }

  .categories-grid {
    column-count: 1;
    gap: 12px;
  }

  .category-card {
    padding: 12px;
  }

  .topic-link {
    padding: 6px 10px;
    font-size: 13px;
  }

  .category-header {
    margin-bottom: 12px;
    padding-bottom: 12px;
  }

  .category-title {
    font-size: 1.1em;
  }

  .stat-number {
    font-size: 1.3em;
  }

  .stat-label {
    font-size: 0.8em;
  }
}