/* ==========================================================================
   Personal Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Bold RGB palette (Spider-Man vibes) */
  --color-bg: #0a0a0a;
  --color-bg-alt: #141414;
  --color-text: #ffffff;
  --color-text-light: #b0b0b0;
  --color-accent: #e62020;
  --color-accent-hover: #ff3333;
  --color-blue: #1a4fd6;
  --color-green: #00a854;
  --color-border: #2a2a2a;
  --color-white: #ffffff;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 18px;
  --font-size-sm: 0.889rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --line-height: 1.6;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;

  /* Layout */
  --max-width: 1100px;
  --nav-height: 70px;

  /* Transitions */
  --transition: 0.2s ease;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 600;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-sm);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

main {
  flex: 1;
  padding: var(--space-xl) 0;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--nav-height);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  stroke: var(--color-text);
  transition: stroke var(--transition);
}

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

.nav-logo:hover .nav-logo-icon {
  stroke: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
}

.nav-links a {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-green), var(--color-blue));
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition);
}

/* Mobile navigation */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-sm) var(--space-md);
    gap: 0;
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .nav-links a.active::after {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Home Page - Hero
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-2xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--space-sm);
  background: linear-gradient(90deg, var(--color-accent), var(--color-green), var(--color-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

.hero-links {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 6px;
  font-weight: 500;
  transition: background-color var(--transition), transform var(--transition);
}

.btn:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--color-blue);
  color: var(--color-blue);
}

.btn-outline:hover {
  background-color: var(--color-blue);
  color: var(--color-white);
}

.btn-green {
  background-color: var(--color-green);
}

.btn-green:hover {
  background-color: #00c462;
}

.btn-blue {
  background-color: var(--color-blue);
}

.btn-blue:hover {
  background-color: #2a5fe6;
}

/* --------------------------------------------------------------------------
   Featured Sections (Home)
   -------------------------------------------------------------------------- */
.featured-section {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
}

.featured-section h2 {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-link {
  display: block;
  text-align: center;
  margin-top: var(--space-md);
  color: var(--color-blue);
}

.section-link:hover {
  color: #4d7fff;
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about-content {
  max-width: 700px;
  margin: 0 auto;
}

.about-content p {
  margin-bottom: var(--space-md);
}

.about-section {
  margin-bottom: var(--space-xl);
}

.contact-links {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.contact-links a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  transition: all var(--transition);
}

.contact-links a:nth-child(3n+1):hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(230, 32, 32, 0.1);
}

.contact-links a:nth-child(3n+2):hover {
  border-color: var(--color-green);
  color: var(--color-green);
  background-color: rgba(0, 168, 84, 0.1);
}

.contact-links a:nth-child(3n):hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
  background-color: rgba(26, 79, 214, 0.1);
}

/* --------------------------------------------------------------------------
   Projects Page
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.project-card:hover {
  box-shadow: 0 4px 20px rgba(230, 32, 32, 0.15);
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.project-card h3 {
  margin-bottom: var(--space-xs);
}

.project-card h3 a {
  color: var(--color-text);
}

.project-card h3 a:hover {
  color: var(--color-accent);
}

.project-card p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.project-tech span {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-weight: 500;
}

.project-tech span:nth-child(3n+1) {
  background-color: rgba(230, 32, 32, 0.15);
  color: #ff4444;
}

.project-tech span:nth-child(3n+2) {
  background-color: rgba(0, 168, 84, 0.15);
  color: #00d468;
}

.project-tech span:nth-child(3n) {
  background-color: rgba(26, 79, 214, 0.2);
  color: #4d7fff;
}

.project-links {
  display: flex;
  gap: var(--space-sm);
}

.project-links a {
  font-size: var(--font-size-sm);
  color: var(--color-blue);
}

.project-links a:hover {
  color: #4d7fff;
}

.project-links a:first-child {
  color: var(--color-green);
}

.project-links a:first-child:hover {
  color: #00d468;
}

/* --------------------------------------------------------------------------
   Writing Page
   -------------------------------------------------------------------------- */
.articles-list {
  max-width: 700px;
  margin: 0 auto;
}

.article-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.article-item h3 {
  margin-bottom: var(--space-xs);
}

.article-item h3 a {
  color: var(--color-text);
}

.article-item h3 a:hover {
  color: var(--color-green);
}

.article-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
}

.article-excerpt {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   Talks Page
   -------------------------------------------------------------------------- */
.talks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-lg);
}

.talk-card {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.talk-card:nth-child(3n+1):hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(230, 32, 32, 0.15);
}

.talk-card:nth-child(3n+2):hover {
  border-color: var(--color-green);
  box-shadow: 0 4px 20px rgba(0, 168, 84, 0.15);
}

.talk-card:nth-child(3n):hover {
  border-color: var(--color-blue);
  box-shadow: 0 4px 20px rgba(26, 79, 214, 0.15);
}

.talk-video {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
}

.talk-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.talk-info {
  padding: var(--space-md);
}

.talk-info h3 {
  margin-bottom: var(--space-xs);
}

.talk-info h3 a {
  color: var(--color-text);
}

.talk-info h3 a:hover {
  color: var(--color-accent);
}

.talk-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
}

.talk-description {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin: 0;
}

@media (max-width: 600px) {
  .talks-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Resume Page
   -------------------------------------------------------------------------- */
.resume-links {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.resume-content {
  max-width: 800px;
  margin: 0 auto;
}

.resume-section {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.resume-section:last-child {
  border-bottom: none;
}

.resume-section h2 {
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-xl);
}

.resume-section h2:nth-of-type(1) {
  color: var(--color-accent);
}

.resume-item {
  margin-bottom: var(--space-lg);
}

.resume-item:last-child {
  margin-bottom: 0;
}

.resume-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.resume-item-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.resume-date {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  white-space: nowrap;
}

.resume-company {
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.resume-list {
  list-style: disc;
  margin-left: 1.5rem;
  color: var(--color-text-light);
}

.resume-list li {
  margin-bottom: var(--space-xs);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-md);
}

.skill-category h4 {
  margin-bottom: var(--space-xs);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.skill-tags span {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-weight: 500;
}

.skill-category:nth-child(4n+1) .skill-tags span {
  background-color: rgba(230, 32, 32, 0.15);
  color: #ff4444;
}

.skill-category:nth-child(4n+2) .skill-tags span {
  background-color: rgba(0, 168, 84, 0.15);
  color: #00d468;
}

.skill-category:nth-child(4n+3) .skill-tags span {
  background-color: rgba(26, 79, 214, 0.2);
  color: #4d7fff;
}

.skill-category:nth-child(4n) .skill-tags span {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-text-light);
}

@media (max-width: 600px) {
  .resume-item-header {
    flex-direction: column;
    gap: 0;
  }

  .resume-date {
    order: -1;
    margin-bottom: var(--space-xs);
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Pictures Page
   -------------------------------------------------------------------------- */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-sm);
}

.photo-item {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
  position: relative;
  border: 2px solid transparent;
  transition: border-color var(--transition);
}

.photo-item:nth-child(3n+1):hover {
  border-color: var(--color-accent);
}

.photo-item:nth-child(3n+2):hover {
  border-color: var(--color-green);
}

.photo-item:nth-child(3n):hover {
  border-color: var(--color-blue);
}

.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.photo-item:hover img {
  transform: scale(1.05);
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: var(--space-md);
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  padding: var(--space-xs);
  line-height: 1;
}

.lightbox-close:hover {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Page Headers
   -------------------------------------------------------------------------- */
.page-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.page-header p {
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-center {
  text-align: center;
}

.placeholder-note {
  background-color: var(--color-bg-alt);
  border: 2px dashed var(--color-border);
  border-radius: 8px;
  padding: var(--space-md);
  text-align: center;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   Responsive Adjustments
   -------------------------------------------------------------------------- */
@media (max-width: 600px) {
  :root {
    --font-size-base: 16px;
  }

  .hero {
    padding: var(--space-xl) 0;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .photo-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-links {
    flex-direction: column;
  }

  .contact-links a {
    justify-content: center;
  }
}