/* ========================================
   DevK061 Portfolio - Custom Design System
   ======================================== */

/* --- CSS Variables --- */
:root {
  /* Unique color palette - deep ocean tones with electric accents */
  --bg-primary: #0a0f14;
  --bg-secondary: #111920;
  --bg-card: #151d26;
  --bg-elevated: #1a242f;

  --text-primary: #e8edf2;
  --text-secondary: #8899aa;
  --text-muted: #5c6b7a;

  --accent-1: #00d4aa; /* Teal */
  --accent-2: #6366f1; /* Indigo */
  --accent-3: #f59e0b; /* Amber */
  --accent-glow: rgba(0, 212, 170, 0.15);

  --border-color: #243040;
  --border-light: #2a3a4a;

  /* Typography */
  --font-display:
    "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

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

  /* Effects */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px var(--accent-glow);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

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

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

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

/* Background grid pattern */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(var(--border-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.3;
  pointer-events: none;
  z-index: -2;
}

/* Gradient orbs */
body::after {
  content: "";
  position: fixed;
  top: -30%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.08) 0%,
    transparent 60%
  );
  pointer-events: none;
  z-index: -1;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
}
h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}
h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

a {
  color: var(--accent-1);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

code,
.mono {
  font-family: var(--font-mono);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

section {
  padding: var(--space-2xl) 0;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  background: rgba(10, 15, 20, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo::before {
  content: ">";
  color: var(--accent-1);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-1);
  transition: width var(--transition-normal);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
}

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

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
}

.hero-content {
  max-width: 800px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.hero-label .dot {
  width: 8px;
  height: 8px;
  background: var(--accent-1);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.2);
  }
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero h1 .highlight {
  color: var(--accent-1);
  position: relative;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
  max-width: 600px;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Terminal decoration */
.hero-terminal {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 45%;
  max-width: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: none;
}

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

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

.terminal-dot.red {
  background: #ff5f56;
}
.terminal-dot.yellow {
  background: #ffbd2e;
}
.terminal-dot.green {
  background: #27ca40;
}

.terminal-body {
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
}

.terminal-line {
  display: flex;
  gap: var(--space-sm);
}

.terminal-prompt {
  color: var(--accent-1);
}

.terminal-cmd {
  color: var(--text-primary);
}

.terminal-output {
  color: var(--text-secondary);
  margin-left: 1.5rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

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

.btn-primary:hover {
  background: #00e5b8;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--bg-primary);
}

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

.btn-secondary:hover {
  border-color: var(--accent-1);
  color: var(--accent-1);
}

/* --- Section Headers --- */
.section-header {
  margin-bottom: var(--space-xl);
}

.section-header .label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-1);
  margin-bottom: var(--space-sm);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

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

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-1);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* --- Skills Section --- */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

.skill-category:hover {
  border-color: var(--accent-1);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.skill-category h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.skill-category h3::before {
  content: attr(data-icon);
  font-size: 1.5rem;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  border-color: var(--accent-1);
  color: var(--accent-1);
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  gap: var(--space-lg);
}

.project-card {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

.project-card:hover {
  border-color: var(--accent-2);
  transform: translateX(8px);
}

.project-visual {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.project-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-placeholder {
  font-size: 3rem;
  opacity: 0.3;
}

.project-info h3 {
  margin-bottom: var(--space-sm);
}

.project-info p {
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

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

.project-tech span {
  padding: 2px 8px;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-2);
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

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

.project-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.project-link:hover {
  color: var(--accent-1);
}

/* --- Learning Roadmap Section --- */
.roadmap-container {
  position: relative;
}

.roadmap-progress {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 54%;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  border-radius: 4px;
  transition: width 1s ease;
}

.progress-text {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-1);
  white-space: nowrap;
}

.roadmap-steps {
  display: grid;
  gap: var(--space-md);
}

.roadmap-step {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.roadmap-step.completed {
  border-color: var(--accent-1);
  opacity: 0.7;
}

.roadmap-step.current {
  border-color: var(--accent-3);
  background: linear-gradient(135deg, var(--bg-card), rgba(245, 158, 11, 0.05));
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.1);
}

.roadmap-step.upcoming {
  opacity: 0.5;
}

.step-number {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
}

.completed .step-number {
  background: var(--accent-1);
  color: var(--bg-primary);
}

.current .step-number {
  background: var(--accent-3);
  color: var(--bg-primary);
  animation: glow-amber 2s ease-in-out infinite;
}

@keyframes glow-amber {
  0%,
  100% {
    box-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
  }
  50% {
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.8);
  }
}

.upcoming .step-number {
  background: var(--bg-elevated);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.step-content h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-xs);
}

.step-courses {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.step-status {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
}

.completed .step-status {
  background: rgba(0, 212, 170, 0.15);
  color: var(--accent-1);
}

.current .step-status {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-3);
}

/* --- Contact Section --- */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.contact-info h3 {
  margin-bottom: var(--space-md);
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.contact-link:hover {
  border-color: var(--accent-1);
  transform: translateX(8px);
}

.contact-link-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  font-size: 1.25rem;
}

.contact-link-text {
  display: flex;
  flex-direction: column;
}

.contact-link-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.contact-link-value {
  color: var(--text-primary);
}

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

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* --- Media Queries --- */
@media (min-width: 1024px) {
  .hero-terminal {
    display: block;
  }

  .hero-content {
    max-width: 50%;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
  }

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

  .nav-toggle {
    display: flex;
  }

  .about-grid,
  .contact-content {
    grid-template-columns: 1fr;
  }

  .project-card {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
  }

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

/* --- Utilities --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}