/* ============================================
   ELEGANT SCIENCE JOURNAL THEME - NATURE STYLE
   ============================================ */

/* === CSS VARIABLES FOR CONSISTENCY === */
:root {
  /* Light Theme (Nature-inspired) */
  --color-light-bg: #ffffff;
  --color-light-bg-secondary: #f8f9fa;
  --color-light-bg-tertiary: #f1f3f4;
  --color-light-text-primary: #212121;
  --color-light-text-secondary: #5f6368;
  --color-light-text-tertiary: #80868b;
  --color-light-border: #dadce0;
  --color-light-accent: #1a73e8;
  --color-light-accent-hover: #0d62d9;
  --color-light-accent-light: #e8f0fe;
  
  /* Dark Theme */
  --color-dark-bg: #202124;
  --color-dark-bg-secondary: #292a2d;
  --color-dark-bg-tertiary: #35363a;
  --color-dark-text-primary: #e8eaed;
  --color-dark-text-secondary: #9aa0a6;
  --color-dark-text-tertiary: #80868b;
  --color-dark-border: #3c4043;
  --color-dark-accent: #8ab4f8;
  --color-dark-accent-hover: #a8c7fa;
  --color-dark-accent-light: rgba(138, 180, 248, 0.1);
  
  /* Typography (Nature-style) */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-serif: Georgia, 'Times New Roman', Times, serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --transition-speed: 0.2s;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
}

/* === BASE STYLES === */
body {
  font-family: var(--font-family-primary);
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--color-light-bg);
  color: var(--color-light-text-primary);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

div {
  text-align: justify;
  text-justify: inter-word;
}

/* === LIGHT THEME (DEFAULT) === */
body {
  background-color: var(--color-light-bg);
  color: var(--color-light-text-primary);
}

#sidebar,
.pkp_block {
  background-color: var(--color-light-bg-secondary);
  color: var(--color-light-text-primary);
  border: 1px solid var(--color-light-border);
  border-radius: var(--border-radius);
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed);
}

#sidebar:hover,
.pkp_block:hover {
  box-shadow: var(--shadow-md);
}

.list-group {
  background-color: var(--color-light-bg);
  border: 1px solid var(--color-light-border);
  border-radius: var(--border-radius);
  padding: 0;
  overflow: hidden;
}

.list-group-item {
  background-color: var(--color-light-bg);
  color: var(--color-light-text-primary);
  border-bottom: 1px solid var(--color-light-border);
  padding: 16px 20px;
  transition: background-color var(--transition-speed);
  font-size: 15px;
}

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

.list-group-item:hover {
  background-color: var(--color-light-bg-tertiary);
}

.date-published {
  color: var(--color-light-text-tertiary);
  font-size: 0.85rem;
  font-family: var(--font-family-serif);
  letter-spacing: 0.3px;
}

/* === PANELS (Nature-style clean panels) === */
.panel {
  background-color: var(--color-light-bg);
  border: 1px solid var(--color-light-border);
  border-radius: var(--border-radius);
  padding: 0;
  overflow: hidden;
  margin-bottom: 24px;
}

.panel-heading {
  background-color: var(--color-light-bg-tertiary);
  color: var(--color-light-text-primary);
  font-weight: var(--font-weight-bold);
  padding: 18px 24px;
  border-bottom: 1px solid var(--color-light-border);
  font-size: 1.1rem;
  letter-spacing: 0.5px;
}

.panel-body {
  background-color: var(--color-light-bg);
  color: var(--color-light-text-primary);
  padding: 24px;
}

/* === LINKS (Nature-style) === */
a {
  color: var(--color-light-accent);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-speed);
  position: relative;
}

a:hover,
a:focus {
  color: var(--color-light-accent-hover);
  text-decoration: none;
  border-bottom: 1px solid var(--color-light-accent);
}

a::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 1px;
  bottom: -1px;
  left: 0;
  background-color: var(--color-light-accent);
  transform: scaleX(0);
  transition: transform var(--transition-speed);
}

a:hover::after {
  transform: scaleX(1);
}

/* === BUTTONS (Nature-style minimal) === */
button {
  background-color: var(--color-light-accent);
  color: white;
  border: 1px solid var(--color-light-accent);
  border-radius: var(--border-radius-sm);
  padding: 10px 20px;
  font-weight: var(--font-weight-medium);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-speed);
  letter-spacing: 0.3px;
}

button:hover {
  background-color: var(--color-light-accent-hover);
  border-color: var(--color-light-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* === SUBMENU ITEMS === */
.has_submenu {
  background-color: var(--color-light-bg-tertiary);
  color: var(--color-light-text-primary);
  border: 1px solid var(--color-light-border);
  border-radius: var(--border-radius-sm);
  padding: 12px 16px;
  transition: all var(--transition-speed);
}

.has_submenu:hover {
  background-color: var(--color-light-bg-secondary);
  border-color: var(--color-light-accent);
}

/* === CATEGORY TAGS (Nature-style) === */
.category_1,
.category_2,
.category_3,
.category_4,
.category_5,
.category_6,
.category_7,
.category_8,
.category_9,
.category_10,
.category_11,
.category_12 {
  background-color: var(--color-light-accent-light);
  color: var(--color-light-accent);
  padding: 8px 16px;
  border-radius: 20px;
  border: none;
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  margin: 4px;
  display: inline-block;
  transition: all var(--transition-speed);
}

.category_1:hover,
.category_2:hover,
.category_3:hover,
.category_4:hover,
.category_5:hover,
.category_6:hover,
.category_7:hover,
.category_8:hover,
.category_9:hover,
.category_10:hover,
.category_11:hover,
.category_12:hover {
  background-color: var(--color-light-accent);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* === SPECIAL BLOCKS === */
.pkp_block.block_information {
  background-color: var(--color-light-bg);
  border-left: 4px solid var(--color-light-accent);
  border-radius: var(--border-radius);
  padding: 20px;
  margin-bottom: 24px;
}

.pkp_block.block_information:hover {
  background-color: var(--color-light-bg-tertiary);
}

.content {
  background-color: var(--color-light-bg);
  color: var(--color-light-text-primary);
  padding: 32px;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-light-border);
  margin-bottom: 24px;
}

.content:hover {
  box-shadow: var(--shadow-md);
}

.block_make_submission_link {
  background-color: var(--color-light-accent);
  color: white;
  padding: 16px 24px;
  border-radius: var(--border-radius);
  border: none;
  text-align: center;
  font-weight: var(--font-weight-bold);
  transition: all var(--transition-speed);
}

.block_make_submission_link:hover {
  background-color: var(--color-light-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.title {
  color: var(--color-light-text-primary);
  padding: 8px 0 16px 0;
  font-size: 2.2rem;
  font-weight: var(--font-weight-bold);
  font-family: var(--font-family-serif);
  border-bottom: 2px solid var(--color-light-accent);
  margin-bottom: 32px;
  letter-spacing: -0.5px;
}

/* === NAVIGATION (Nature-style) === */
#main-navigation > li > a {
  color: var(--color-light-text-primary);
  font-weight: var(--font-weight-medium);
  padding: 8px 16px;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-speed);
}

#main-navigation > li > a:hover {
  color: var(--color-light-accent);
  background-color: var(--color-light-accent-light);
}

#navigationUser > li > a {
  color: var(--color-light-text-primary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-speed);
}

#navigationUser > li > a:hover {
  color: var(--color-light-accent);
}

/* === DARK THEME === */
body.dark-theme {
  background-color: var(--color-dark-bg);
  color: var(--color-dark-text-primary);
}

body.dark-theme #sidebar,
body.dark-theme .pkp_block {
  background-color: var(--color-dark-bg-secondary);
  color: var(--color-dark-text-primary);
  border: 1px solid var(--color-dark-border);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

body.dark-theme .list-group {
  background-color: var(--color-dark-bg-tertiary);
  border: 1px solid var(--color-dark-border);
}

body.dark-theme .list-group-item {
  background-color: var(--color-dark-bg-tertiary);
  color: var(--color-dark-text-primary);
  border-bottom: 1px solid var(--color-dark-border);
}

body.dark-theme .list-group-item:hover {
  background-color: var(--color-dark-bg-secondary);
}

body.dark-theme .date-published {
  color: var(--color-dark-text-tertiary);
}

/* Dark Theme Panels */
body.dark-theme .panel {
  background-color: var(--color-dark-bg-secondary);
  border: 1px solid var(--color-dark-border);
}

body.dark-theme .panel-heading {
  background-color: var(--color-dark-bg-tertiary);
  color: var(--color-dark-text-primary);
  border-bottom: 1px solid var(--color-dark-border);
}

body.dark-theme .panel-body {
  background-color: var(--color-dark-bg-secondary);
  color: var(--color-dark-text-primary);
}

/* Dark Theme Links */
body.dark-theme a {
  color: var(--color-dark-accent);
}

body.dark-theme a:hover,
body.dark-theme a:focus {
  color: var(--color-dark-accent-hover);
  border-bottom-color: var(--color-dark-accent);
}

body.dark-theme a::after {
  background-color: var(--color-dark-accent);
}

/* Dark Theme Buttons */
body.dark-theme button {
  background-color: var(--color-dark-accent);
  color: var(--color-dark-bg);
  border: 1px solid var(--color-dark-accent);
}

body.dark-theme button:hover {
  background-color: var(--color-dark-accent-hover);
  border-color: var(--color-dark-accent-hover);
  color: var(--color-dark-bg);
}

/* Dark Theme Submenu */
body.dark-theme .has_submenu {
  background-color: var(--color-dark-bg-tertiary);
  color: var(--color-dark-text-primary);
  border: 1px solid var(--color-dark-border);
}

body.dark-theme .has_submenu:hover {
  background-color: var(--color-dark-bg-secondary);
  border-color: var(--color-dark-accent);
}

/* Dark Theme Categories */
body.dark-theme .category_1,
body.dark-theme .category_2,
body.dark-theme .category_3,
body.dark-theme .category_4,
body.dark-theme .category_5,
body.dark-theme .category_6,
body.dark-theme .category_7,
body.dark-theme .category_8,
body.dark-theme .category_9,
body.dark-theme .category_10,
body.dark-theme .category_11,
body.dark-theme .category_12 {
  background-color: var(--color-dark-accent-light);
  color: var(--color-dark-accent);
}

body.dark-theme .category_1:hover,
body.dark-theme .category_2:hover,
body.dark-theme .category_3:hover,
body.dark-theme .category_4:hover,
body.dark-theme .category_5:hover,
body.dark-theme .category_6:hover,
body.dark-theme .category_7:hover,
body.dark-theme .category_8:hover,
body.dark-theme .category_9:hover,
body.dark-theme .category_10:hover,
body.dark-theme .category_11:hover,
body.dark-theme .category_12:hover {
  background-color: var(--color-dark-accent);
  color: var(--color-dark-bg);
}

/* Dark Theme Special Blocks */
body.dark-theme .pkp_block.block_information {
  background-color: var(--color-dark-bg-secondary);
  border-left: 4px solid var(--color-dark-accent);
}

body.dark-theme .pkp_block.block_information:hover {
  background-color: var(--color-dark-bg-tertiary);
}

body.dark-theme .content {
  background-color: var(--color-dark-bg-secondary);
  color: var(--color-dark-text-primary);
  border: 1px solid var(--color-dark-border);
}

body.dark-theme .block_make_submission_link {
  background-color: var(--color-dark-accent);
  color: var(--color-dark-bg);
}

body.dark-theme .block_make_submission_link:hover {
  background-color: var(--color-dark-accent-hover);
}

body.dark-theme .title {
  color: var(--color-dark-text-primary);
  border-bottom: 2px solid var(--color-dark-accent);
}

/* Dark Theme Navigation */
body.dark-theme #main-navigation > li > a {
  color: var(--color-dark-text-primary);
}

body.dark-theme #main-navigation > li > a:hover {
  color: var(--color-dark-accent);
  background-color: var(--color-dark-accent-light);
}

body.dark-theme #navigationUser > li > a {
  color: var(--color-dark-text-primary);
}

body.dark-theme #navigationUser > li > a:hover {
  color: var(--color-dark-accent);
}

/* === UTILITY CLASSES FOR NATURE STYLE === */
.science-heading {
  font-family: var(--font-family-serif);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.5px;
  color: inherit;
}

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

body.dark-theme .accent-border {
  border-left: 4px solid var(--color-dark-accent);
}

.minimal-card {
  background: var(--color-light-bg);
  border: 1px solid var(--color-light-border);
  border-radius: var(--border-radius);
  padding: 24px;
  transition: all var(--transition-speed);
}

body.dark-theme .minimal-card {
  background: var(--color-dark-bg-secondary);
  border: 1px solid var(--color-dark-border);
}

.minimal-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* === RESPONSIVE ADJUSTMENTS === */
@media (max-width: 768px) {
  .content {
    padding: 20px;
  }
  
  .title {
    font-size: 1.8rem;
  }
  
  .panel-body {
    padding: 16px;
  }
}