/* ==========================================================================
   Portfolio — Dark-mode first, terminal-inspired, brutalist-adjacent
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Base colors — muted technical palette */
  --bg-primary: #0f0f0f;
  --bg-secondary: #161616;
  --bg-tertiary: #1c1c1c;
  --bg-elevated: #222222;
  --bg-section-alt: #161619;

  --text-primary: #e8e8e8;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;

  /* Accent colors — subdued, functional */
  --accent-green: #7c9f7c;
  --accent-amber: #c9a55a;
  --accent-blue: #6b8fa3;
  --accent-red: #b85c5c;

  /* Terminal specific */
  --terminal-bg: #0a0a0a;
  --terminal-border: #2a2a2a;
  --terminal-prompt: #7c9f7c;

  /* Borders & dividers */
  --border-color: #2a2a2a;
  --border-subtle: #1f1f1f;

  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --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;

  /* Layout */
  --max-width: 900px;
  --nav-height: 60px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* --------------------------------------------------------------------------
   Interactive Background Canvas
   -------------------------------------------------------------------------- */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

::selection {
  background-color: var(--accent-green);
  color: var(--bg-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

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

input {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

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

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav-links a {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 24px;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.active span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle.active span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Mobile nav menu */
.mobile-nav {
  display: none;
  flex-direction: column;
  padding: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-primary);
}

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

.mobile-nav a {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
}

/* --------------------------------------------------------------------------
   Terminal Hero
   -------------------------------------------------------------------------- */
#hero {
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  padding-top: calc(var(--nav-height) + var(--space-xl));
}

.terminal {
  width: 100%;
  max-width: 700px;
  background-color: var(--terminal-bg);
  border: 1px solid var(--terminal-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.terminal-header {
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--terminal-border);
}

.terminal-controls {
  display: flex;
  gap: 8px;
}

.terminal-controls .control {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.control.close { background-color: #ff5f57; }
.control.minimize { background-color: #febc2e; }
.control.maximize { background-color: #28c840; }

.terminal-title {
  flex: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.terminal-spacer {
  width: 52px;
}

.terminal-body {
  padding: var(--space-lg);
  min-height: 300px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.terminal-output .line {
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.terminal-output .line.muted {
  color: var(--text-muted);
}

.terminal-output .line.command {
  color: var(--text-primary);
}

.terminal-output .line.command::before {
  content: '$ ';
  color: var(--terminal-prompt);
}

.terminal-output .response {
  margin: var(--space-sm) 0 var(--space-md) 0;
  padding-left: var(--space-md);
  border-left: 2px solid var(--border-color);
}

.terminal-output .response-title {
  color: var(--accent-amber);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.terminal-output .response-text {
  color: var(--text-secondary);
}

.terminal-output .response-list {
  color: var(--text-secondary);
}

.terminal-output .response-list li {
  margin-bottom: 2px;
}

.terminal-output .response-list li::before {
  content: '- ';
  color: var(--text-muted);
}

.terminal-output .link {
  color: var(--accent-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.terminal-output .link:hover {
  color: var(--text-primary);
}

.terminal-input-line {
  display: flex;
  align-items: center;
  margin-top: var(--space-md);
}

.prompt {
  color: var(--terminal-prompt);
  margin-right: var(--space-sm);
  white-space: nowrap;
}

.terminal-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
  caret-color: var(--accent-green);
}

.cursor {
  display: none;
}

/* Command hints below terminal */
.hero-hint {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  justify-content: center;
}

.hint-command {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.hint-command:hover {
  border-color: var(--text-muted);
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Sections — Common styles
   -------------------------------------------------------------------------- */
section {
  padding: var(--space-4xl) var(--space-lg);
  position: relative;
}

section > * {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.section-marker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-green);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2xl);
  letter-spacing: -0.03em;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background-color: var(--accent-green);
  margin-top: var(--space-sm);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
#about {
  background-color: var(--bg-section-alt);
  border-top: 1px solid rgba(124, 159, 124, 0.15);
}

/* Profile picture and intro header */
.about-header {
  display: flex;
  gap: var(--space-2xl);
  align-items: center;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--border-color);
}

.profile-picture {
  position: relative;
  width: 140px;
  height: 140px;
  flex-shrink: 0;
}

.profile-picture img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid var(--border-color);
}

/* Fallback placeholder when image doesn't load */
.profile-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-muted);
}

/* Hide placeholder when image loads */
.profile-picture img:not([src=""]):not([src$="undefined"]) + .profile-placeholder {
  display: none;
}

/* Show placeholder when image fails to load */
.profile-picture img[src=""],
.profile-picture img:not([src]) {
  display: none;
}

.about-intro {
  flex: 1;
}

.about-intro .about-lead {
  font-size: var(--text-lg);
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
}

.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.about-lead {
  font-size: var(--text-lg);
  color: var(--text-primary) !important;
  line-height: 1.5;
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.meta-group h4 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.meta-group p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Skills section */
.skills-section {
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-2xl);
}

.skills-section h3 {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-xl);
}

.skill-group h4 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.skill-group ul li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

/* --------------------------------------------------------------------------
   Work / Projects Section
   -------------------------------------------------------------------------- */
#work {
  border-top: 1px solid rgba(124, 159, 124, 0.15);
}

.project {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--border-subtle);
}

.project:last-of-type {
  border-bottom: none;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.project-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-green);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.project-name {
  font-family: var(--font-sans);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.project-body {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.project-problem h4,
.project-approach h4,
.project-outcome h4 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.project-problem p,
.project-approach p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.project-outcome ul {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.project-outcome ul li {
  margin-bottom: var(--space-xs);
  position: relative;
  padding-left: var(--space-md);
}

.project-outcome ul li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

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

.project-link {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

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

.work-more {
  text-align: center;
  padding-top: var(--space-lg);
}

.work-more a {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.work-more a:hover {
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
#contact {
  background-color: var(--bg-section-alt);
  border-top: 1px solid rgba(124, 159, 124, 0.15);
}

.contact-content {
  max-width: 600px;
}

.contact-text {
  font-size: var(--text-2xl);
  color: var(--text-primary);
  line-height: 1.4;
  font-weight: 500;
  margin-bottom: var(--space-xl);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.contact-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.contact-link:hover {
  border-color: var(--text-muted);
  background-color: var(--bg-tertiary);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-value {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: 6px;
  transition: all 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--accent-green);
  color: var(--bg-primary);
  border: 1px solid var(--accent-green);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent-green);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xl) var(--space-lg);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-separator {
  color: var(--border-color);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .project-body {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  :root {
    --text-2xl: 1.375rem;
    --text-3xl: 1.75rem;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .about-header {
    flex-direction: column;
    text-align: center;
  }

  .profile-picture {
    width: 120px;
    height: 120px;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .about-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

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

  .terminal-body {
    padding: var(--space-md);
    min-height: 250px;
  }
}

@media (max-width: 480px) {
  section {
    padding: var(--space-3xl) var(--space-md);
  }

  .about-meta {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .contact-link {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

  .hero-hint {
    gap: var(--space-xs);
  }

  .hint-command {
    font-size: 0.7rem;
  }
}