/* ==========================================================================
   BRITTANY CHIANG INSPIRED PORTFOLIO
   Dark Navy + Teal Accent + Cursor Spotlight
   ========================================================================== */

:root {
  /* Colors - Dark Navy Theme */
  --color-bg-primary: #0a192f;
  --color-bg-secondary: #112240;
  --color-bg-tertiary: #233554;

  --color-text-primary: #ccd6f6;
  --color-text-secondary: #8892b0;
  --color-text-muted: #495670;

  /* Teal Accent */
  --color-accent: #64ffda;
  --color-accent-hover: #5ce0c3;
  --color-accent-glow: rgba(100, 255, 218, 0.15);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;

  --leading-tight: 1.1;
  --leading-snug: 1.3;
  --leading-normal: 1.6;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --sidebar-width: 45%;
  --content-width: 55%;
  --max-width: 1400px;

  /* Borders & Shadows */
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  overflow-x: hidden;
  position: relative;
}

::selection {
  background-color: var(--color-accent-glow);
  color: var(--color-accent);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

img {
  max-width: 100%;
  height: auto;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* --------------------------------------------------------------------------
   Cursor Spotlight Effect
   -------------------------------------------------------------------------- */
.spotlight {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 30;
  background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(29, 78, 216, 0.15), transparent 40%);
  transition: background 0.15s ease;
}

/* --------------------------------------------------------------------------
   Two-Column Layout
   -------------------------------------------------------------------------- */
.layout {
  display: flex;
  justify-content: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-12);
  min-height: 100vh;
}

@media (max-width: 1024px) {
  .layout {
    flex-direction: column;
    padding: var(--space-6);
  }
}

/* --------------------------------------------------------------------------
   Sidebar (Left Column - Sticky)
   -------------------------------------------------------------------------- */
.sidebar {
  position: sticky;
  top: 0;
  width: var(--sidebar-width);
  max-height: 100vh;
  padding: var(--space-24) var(--space-8) var(--space-24) 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

@media (max-width: 1024px) {
  .sidebar {
    position: relative;
    width: 100%;
    max-height: none;
    padding: var(--space-16) 0;
  }
}

.sidebar-header {
  margin-bottom: var(--space-8);
}

.sidebar-name {
  font-size: var(--text-5xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-3);
}

.sidebar-title {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.sidebar-bio {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 320px;
  line-height: var(--leading-normal);
}

/* Navigation with Line Indicators */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-12);
}

@media (max-width: 1024px) {
  .sidebar-nav {
    display: none;
  }
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}

.nav-item:hover,
.nav-item.active {
  color: var(--color-text-primary);
}

.nav-line {
  width: 32px;
  height: 1px;
  background: var(--color-text-muted);
  transition: all var(--transition-base);
}

.nav-item:hover .nav-line,
.nav-item.active .nav-line {
  width: 64px;
  background: var(--color-text-primary);
}

/* Social Links */
.sidebar-socials {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-top: auto;
  padding-top: var(--space-12);
}

.social-link {
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.social-link:hover {
  color: var(--color-accent);
  transform: translateY(-3px);
}

.social-link svg {
  width: 22px;
  height: 22px;
}

/* --------------------------------------------------------------------------
   Main Content (Right Column - Scrollable)
   -------------------------------------------------------------------------- */
.main-content {
  width: var(--content-width);
  padding: var(--space-24) 0 var(--space-24) var(--space-8);
}

@media (max-width: 1024px) {
  .main-content {
    width: 100%;
    padding: 0;
  }
}

.content-section {
  margin-bottom: var(--space-24);
  scroll-margin-top: var(--space-16);
}

.section-anchor {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-8);
  display: block;
}

@media (min-width: 1025px) {
  .section-anchor {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Experience/Project Cards
   -------------------------------------------------------------------------- */
.card-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.card {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
}

.card:hover {
  background: var(--color-accent-glow);
}

.card-date {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-top: 4px;
}

.card-content {
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.card:hover .card-title {
  color: var(--color-accent);
}

.card-title-arrow {
  transition: transform var(--transition-fast);
  opacity: 0;
}

.card:hover .card-title-arrow {
  opacity: 1;
  transform: translate(4px, -4px);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.card-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-4);
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.tag {
  display: inline-flex;
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent-glow);
  color: var(--color-accent);
  border-radius: 9999px;
  font-size: var(--text-xs);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about-text {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.about-text p {
  margin-bottom: var(--space-4);
}

.about-text strong,
.about-text a {
  color: var(--color-text-primary);
}

.about-text a:hover {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
  margin-top: var(--space-16);
}

.footer-text a {
  color: var(--color-text-secondary);
}

.footer-text a:hover {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Resume Button
   -------------------------------------------------------------------------- */
.btn-resume {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  margin-top: var(--space-8);
}

.btn-resume:hover {
  background: var(--color-accent-glow);
}

/* --------------------------------------------------------------------------
   Mobile Styles
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .card {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .sidebar-name {
    font-size: var(--text-4xl);
  }
}

/* --------------------------------------------------------------------------
   Scroll Reveal Animation
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}