/* ==========================================================================
   1. DESIGN SYSTEM VARIABLES (Custom Properties)
   ========================================================================== */
:root {
  --background: #0A0F1D;
  --text: #F4F6FA;
  --text-muted: #94A3B8;
  --accent-secondary: #131B2E;
  --accent-tertiary: #4a68ae;
  --accent-primary: #6366F1;
  --accent: #FF5A5F;
}

[data-theme="light"] {
  --background: #F8FAFC;
  --text: #0F172A;
  --text-muted: #475569;
  --accent-secondary: #FFFFFF;
  --accent-tertiary: #E2E8F0;
  --accent-primary: #4F46E5;
  --accent: #DE3B40;
}
/* Import Official Brand-Style Fonts */
@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@700&family=Crimson+Pro:wght@600&family=Roboto:wght@700&display=swap');

/* ==========================================================================
   2. GLOBAL RESET, BEHAVIOR & BASE STYLES
   ========================================================================== */
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--background);
  color: var(--text);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 1rem;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#summary, #skills, #education, #projects, #experience {
  scroll-margin-top: 80px;
}

h1 {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 2.5rem;
  margin: 0;
  padding: 10px 0;
  color: var(--text);
}

h2 {
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 1.25rem;
  margin: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--accent-tertiary);
}

h3 {
  color: var(--text);
  font-size: 1.25rem;
  margin: 20px 0 5px 0;
}

h4 {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0 0 15px 0;
}

p {
  margin: 0 0 15px 0;
  color: var(--text-muted);
}

ul {
  list-style-type: square;
  padding-left: 1.25rem;
  margin: 10px 0;
}

ul li {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 8px;
  color: var(--text-muted);
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
}

#contact a {
  color: var(--accent);
}

/* ==========================================================================
   3. GLOBAL NAVIGATION MODULE
   ========================================================================== */
nav {
  background-color: var(--accent-tertiary);
  width: 100%;
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

nav ul {
  display: flex;
  justify-content: center;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 40px;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color 0.2s ease-in-out;
}

nav a:hover {
  color: var(--accent);
}

#theme-toggle {
  background: var(--accent-secondary);
  color: var(--text);
  border: 1px solid var(--accent-tertiary);
  padding: 6px 12px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
}

#theme-toggle:hover {
  background: var(--accent);
  color: #FFFFFF;
}

.top-nav-arrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   4. INTERACTIVE TOOLTIP POPUP PATTERN
   ========================================================================== */
.tooltip-wrapper {
  position: relative;
  display: inline-block;
}

.tooltip-wrapper .tooltip-text {
  visibility: hidden;
  width: max-content;
  max-width: 280px;
  background-color: var(--background);
  color: var(--text);
  border: 1px solid var(--accent-tertiary);
  text-align: center;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  white-space: normal;
  position: absolute;
  z-index: 100;
  top: 135%;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  pointer-events: none;
}

.tooltip-wrapper .tooltip-text::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  margin-left: -6px;
  border-width: 6px;
  border-style: solid;
  border-color: transparent transparent var(--background) transparent;
}

.tooltip-wrapper .tooltip-text::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  margin-left: -7px;
  border-width: 7px;
  border-style: solid;
  border-color: transparent transparent var(--accent-tertiary) transparent;
  z-index: -1;
}

@media (hover: hover) {
    .tooltip-wrapper:hover .tooltip-text {
        visibility: visible;
        opacity: 1;
    }
}

/* Accessible focus engine: Uses structural next-sibling combinator */
#theme-toggle:focus-visible + .tooltip-text {
    visibility: visible;
    opacity: 1;
}


/* ==========================================================================
   5. CONTAINER & CARD LAYOUTS
   ========================================================================== */
header {
  background-color: var(--accent-secondary);
  color: var(--text);
  padding: 40px 20px;
  text-align: center;
  border-bottom: 1px solid var(--accent-tertiary);
}

.portfolio-container {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
  box-sizing: border-box;
}

#summary, #skills, #education, #projects, #experience {
  background-color: var(--accent-secondary);
  color: var(--text);
  max-width: 800px;
  margin: 30px auto;
  padding: 30px;
  border-radius: 8px;
  border: 1px solid var(--accent-tertiary);
  box-sizing: border-box;
}

/* ==========================================================================
   6. SKILLS & PROJECTS MODULE
   ========================================================================== */
.skills-grid, .projects-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-top: 15px;
}

.skills-category h3 {
  margin: 0 0 10px 0;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  background-color: var(--accent-tertiary);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: background-color 0.2s ease;
}

.tech-tag:hover {
  background-color: var(--accent-secondary);
  border-color: var(--accent-primary);
}

/* ==========================================================================
   7. PROJECT SUBPAGES STRUCTURE (SaaS Layout Framework)
   ========================================================================== */
.section-header {
  background-color: var(--accent-secondary);
  padding: 40px 30px;
  border-radius: 8px;
  border: 1px solid var(--accent-tertiary);
  margin-bottom: 30px;
}

.section-header h1 {
  font-size: 2rem;
  color: var(--text);
}

.subtitle {
  margin-top: 10px;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.project-card {
  background-color: var(--accent-secondary);
  padding: 30px;
  border-radius: 8px;
  border: 1px solid var(--accent-tertiary);
}

.project-card h2 {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 12px;
}

.badge-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.project-links {
  display: flex;
  gap: 20px;
  margin-top: 15px;
}

.cta-link {
  color: var(--accent);
  font-weight: 600;
}

.secondary-link {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.secondary-link:hover {
  color: var(--text);
}

.portfolio-nav {
  display: flex;
  align-items: center;
  padding: 15px 30px;
}

.back-link {
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  transition: color 0.2s ease;
}

.back-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ==========================================================================
   8. RESPONSIVE MEDIA QUERIES (Unified Breakpoints Hub)
   ========================================================================== */
/* --- Desktop Layout Rules --- */
@media screen and (min-width: 769px) {
  .split-row {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 30px;
    padding: 24px 0;
    border-bottom: 4px solid var(--accent-tertiary);
  }
  
  .split-row:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .meta-side {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  
  .meta-side h3 {
    margin: 0;
    font-size: 1.15rem;
  }
  
  .meta-location {
    margin: 0;
    font-size: 1rem;
    color: var(--text-muted);
  }
  
  .date-badge {
    align-self: flex-start;
    background-color: var(--accent-tertiary);
    color: var(--text);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    letter-spacing: 0.5px;
    padding: 4px 8px;
  }
  
  .content-side {
    display: flex;
    flex-direction: column;
  }
  
  .content-side h4 {
    margin: 0 0 10px 0;
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 600;
  }
}

/* --- Mobile Layout Fallbacks --- */
@media screen and (max-width: 768px) {
  .split-row {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 20px 0;
    border-bottom: 1px solid var(--accent-tertiary);
  }
  
  .split-row:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .date-badge {
    display: inline-block;
    background-color: var(--accent-tertiary);
    padding: 4px 8px;
    font-size: 0.75rem;
    border-radius: 4px;
    margin-top: 4px;
  }
  
  nav ul {
    flex-wrap: wrap;
    gap: 16px;
    padding: 5px;
  }
  
  nav a {
    font-size: 0.85rem;
  }
}

/* ==========================================================================
   9. INSTITUTIONAL BRAND MATRIX (Logo & Identity)
   ========================================================================== */

/* --- Global Logo Standards --- */
.brand-logo {
    display: block; /* Ensures they stack correctly in the header block */
    width: auto;
    object-fit: contain;
    transition: opacity 0.3s ease;
}

/* --- Per-School Size Adjustments (Visual Weighting) --- */

/* ASU: Rectangular logo, needs a slightly smaller height to not feel huge */
.edu-asu .brand-logo {
    max-height: 35px;
}

/* IC: The shield/crest is often taller, so we give it more vertical room */
.edu-ic .brand-logo {
    max-height: 50px;
    margin-bottom: 5px;
}

/* IRSC: A mid-range height works best for their horizontal lockup */
.edu-irsc .brand-logo {
    max-height: 40px;
    margin-bottom: 5px;
}

/* --- Branding Logic (Typography & Colors) --- */
.edu-asu {
    --brand-primary: #8C1D40; /* Maroon */
    --brand-font: 'Arial Black', sans-serif;
}

.edu-ic {
    --brand-primary: #003366; /* Blue */
    --brand-font: 'Times New Roman', serif;
}

.edu-irsc {
    --brand-primary: #003DA5; /* Navy */
    --brand-font: Arial, sans-serif;
}

/* Apply Typography and Themed Colors */
.split-row[class*="edu-"] h3 {
    font-family: var(--brand-font);
    color: var(--brand-primary) !important;
}
  
/* Dark Mode Color Swap for Accessibility */
[data-theme="dark"] .edu-asu h3 { color: #FFC627 !important; } /* Gold on Dark */
[data-theme="dark"] .edu-ic h3 { color: #94c1ff !important; } /* Light Blue on Dark */
[data-theme="dark"] .edu-irsc h3 { color: #FEDB00 !important; } /* Gold on Dark */

/* ==========================================================================
   THEME-BASED LOGO TOGGLE
   ========================================================================== */

/* Dark Mode (Default) - Hide the logo meant for light backgrounds */
.logo-light { 
    display: none !important; 
}

/* Dark Mode (Default) - Show the logo meant for dark backgrounds */
.logo-dark { 
    display: block !important; 
}

/* Light Mode - Flip the visibility */
[data-theme="light"] .logo-light { 
    display: block !important; 
}

[data-theme="light"] .logo-dark { 
    display: none !important; 
}