/* 
   STEP 8: CSS VARIABLES (DESIGN TOKENS)
   By defining variables at the top, we can easily change the 
   entire look and feel of the site just by editing these values.
*/
:root {
  --bg-color: #fdfdfd;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --accent: #9a9a9a;
  --border: #eeeeee;
  --font-serif: "Playfair Display", serif;
  --font-sans: "Inter", sans-serif;
  --spacing-unit: 1.5rem;
}

/* 
   STEP 16: DARK MODE OVERRIDES
   When the 'dark-mode' class is added to the body, 
   we swap the values of our variables.
*/
body.dark-mode {
  --bg-color: #1a1a1a;
  --text-primary: #fdfdfd;
  --text-secondary: #aaaaaa;
  --border: #333333;
}

/* 
   STEP 9: RESET & BASE STYLES
   Removing browser defaults (margin/padding) ensures our 
   design looks consistent across all browsers.
*/
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased; /* Makes fonts look smoother on Mac */
  padding: 2rem 1rem;
}

/* 
   STEP 10: LAYOUT CONTAINER
   Limiting the width (800px) and centering it (margin: 0 auto)
   creates a professional "CV paper" feel on large screens.
*/
.cv-container {
  max-width: 800px;
  margin: 0 auto;
}

/* 
   STEP 11: HEADER STYLING (Flexbox)
   We use display: flex with justify-content: space-between 
   to push the name to the left and contact info to the right.
*/
.cv-header {
  border-bottom: 2px solid var(--text-primary);
  padding-bottom: 2rem;
  margin-bottom: 4rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.name {
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.role {
  font-size: 1.1rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0;
}

/* 
   STEP 15.1: FLOATING BUTTON STYLING
   We use position: fixed to keep the button in the same spot
   even when we scroll.
*/
.theme-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--text-primary); /* Swaps with theme */
  border: 1px solid var(--border);
  color: var(--bg-color); /* Swaps with theme */
  padding: 0.6rem 1.2rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 2rem; /* Rounded pull feel */
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
}

.theme-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.theme-btn:active {
  transform: translateY(0);
}

.social-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-bottom 0.2s;
}

.social-links a:hover {
  border-bottom: 1px solid var(--text-primary);
}

.contact-info {
  text-align: right;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* 
   STEP 12: SECTION TYPOGRAPHY
   Hierachy is key. Small, uppercase, spaced-out letters 
   create a premium editorial look for section titles.
*/
.cv-section {
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.experience-item,
.project-item {
  margin-bottom: 2.5rem;
}

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.25rem;
}

.item-title {
  font-size: 1.25rem;
  font-weight: 600;
}

/* Link Animation: A simple way to add "premium" feel */
.item-title a {
  color: var(--text-primary);
  text-decoration: none;
  background: linear-gradient(
      to right,
      var(--text-primary),
      var(--text-primary)
    )
    no-repeat bottom left;
  background-size: 0 1px;
  transition: background-size 0.3s;
}

.item-title a:hover {
  background-size: 100% 1px;
}

.item-date {
  font-size: 0.9rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.item-org {
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.item-desc {
  color: var(--text-secondary);
  max-width: 600px;
}

/* 
   STEP 13: GRID SYSTEM
   We use display: grid to create a 2-column layout for 
   Skills and Education side-by-side.
*/
.inline-sections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.skills-list {
  list-style: none;
}

.skills-list li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.skills-list li::before {
  content: "— "; /* Adding custom bullet points with CSS */
  color: var(--accent);
}

/* Footer styling */
.cv-footer {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  margin-top: 6rem;
  color: var(--accent);
  font-size: 0.85rem;
  text-align: center;
}

/* 
   STEP 14: RESPONSIVENESS (Media Queries)
   We rethink the layout for smaller screens (phones). 
   We stack the header and grid columns vertically.
*/
@media (max-width: 600px) {
  .cv-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-info {
    text-align: left;
    margin-top: 1.5rem;
  }

  .name {
    font-size: 2.5rem;
  }

  .inline-sections {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .item-header {
    flex-direction: column;
  }

  .item-date {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
  }
}