/* main.css */

/* ─── Base ────────────────────────────────────────────────── */
body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.7;
  position: relative;
  overflow-x: hidden;
}

/* Grain texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.4;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Section divider */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: 0 auto;
  max-width: var(--max-width);
}

/* Fade-in animation (triggered by IntersectionObserver) */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ─── Navigation ──────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(13, 15, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: border-color var(--transition-normal);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo .cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--color-accent);
  margin-left: 1px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-muted);
  font-weight: 500;
  position: relative;
  transition: color var(--transition-fast);
}

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

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

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

/* Language toggle */
.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
  letter-spacing: 0.05em;
}

.lang-toggle:hover,
.lang-toggle[aria-pressed="true"] {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

/* Mobile nav */
.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  color: var(--color-muted);
}

.nav-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ─── Hero ────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-16);
  display: flex;
  align-items: center;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  width: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-green);
  font-weight: 500;
}

.hero-tag::before {
  content: '>';
  color: var(--color-muted);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1.15;
  color: var(--color-text);
  font-weight: 400;
}

.hero-title span {
  color: var(--color-accent);
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-subtitle span {
  color: var(--color-accent);
  opacity: 0.7;
}

.hero-desc {
  font-size: 1rem;
  color: var(--color-muted);
  max-width: 38ch;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-body);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border: 1px solid transparent;
}

.btn-primary:hover {
  background: #4a7de0;
  transform: translateY(-1px);
}

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

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

/* Terminal block */
.terminal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  z-index: 1;
  margin-bottom: -50px;
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.4);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: #0a0c10;
  border-bottom: 1px solid var(--color-border);
}

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

.terminal-dot:nth-child(1) { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #febc2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-left: var(--space-3);
}

.terminal-body {
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.9;
  min-height: 220px;
}

.terminal-line {
  display: flex;
  gap: var(--space-2);
}

.terminal-prompt {
  color: var(--color-green);
  user-select: none;
}

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

.terminal-output {
  color: var(--color-muted);
  padding-left: 0;
  margin-bottom: var(--space-2);
}

.terminal-output .highlight {
  color: var(--color-accent);
}

.terminal-output .green {
  color: var(--color-green);
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 1em;
  background: var(--color-green);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
  opacity: 0;
}


/* ─── About ───────────────────────────────────────────────── */
.about {
  padding: calc(var(--space-24) + 50px) 0 var(--space-20);
  position: relative;
}

.about-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-16);
  align-items: start;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 1px;
  background: var(--color-accent);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--color-text);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: var(--space-6);
}

.about-text p {
  color: var(--color-muted);
  margin-bottom: var(--space-4);
  line-height: 1.8;
  font-size: 0.95rem;
}

.about-text p strong {
  color: var(--color-text);
  font-weight: 600;
}

.about-photo {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  background: var(--color-surface);
  margin-bottom: var(--space-6);
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(20%);
}

.about-photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 3rem;
  color: var(--color-border);
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.stat-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: 0.875rem;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.stat-icon {
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.stat-text {
  color: var(--color-muted);
  line-height: 1.4;
}

.stat-text strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 1px;
}


/* ─── Skills ──────────────────────────────────────────────── */
.skills {
  padding: var(--space-20) 0;
}

.skills-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.skills-header {
  margin-bottom: var(--space-12);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
}

.skill-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-5);
  transition: border-color var(--transition-fast);
}

.skill-card:hover {
  border-color: color-mix(in srgb, var(--color-border) 60%, var(--color-accent) 40%);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.skill-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  font-size: 1rem;
}

.skill-category {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  font-family: var(--font-mono);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-green);
  border: 1px solid rgba(74, 222, 154, 0.15);
}

.tag.learning {
  background: rgba(245, 200, 66, 0.08);
  color: var(--color-yellow);
  border-color: rgba(245, 200, 66, 0.2);
}


/* ─── Experience ──────────────────────────────────────────── */
.experience {
  padding: var(--space-20) 0;
}

.experience-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.experience-header {
  margin-bottom: var(--space-12);
}

.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border) 80%, transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-10);
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) - 4px);
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  transition: background var(--transition-fast);
}

.timeline-item:hover::before {
  background: var(--color-accent);
}

.timeline-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

.timeline-badge.current {
  background: rgba(74, 222, 154, 0.12);
  color: var(--color-green);
  border: 1px solid rgba(74, 222, 154, 0.25);
}

.timeline-badge.past {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border: 1px solid rgba(91, 141, 238, 0.2);
}

.timeline-role {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-text);
  font-weight: 400;
  margin-bottom: var(--space-1);
}

.timeline-company {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--color-muted);
  max-width: 60ch;
  line-height: 1.75;
}


/* ─── Projects ────────────────────────────────────────────── */
.projects {
  padding: var(--space-20) 0;
}

.projects-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.projects-header {
  margin-bottom: var(--space-12);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition-normal), transform var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-green));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.project-card:hover::before {
  transform: scaleX(1);
}

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-text);
  font-weight: 400;
}

.project-links {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

.project-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2px var(--space-2);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.project-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.75;
  flex: 1;
}

.project-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  align-self: flex-start;
}

.status-maintenance {
  background: rgba(245, 200, 66, 0.1);
  color: var(--color-yellow);
  border: 1px solid rgba(245, 200, 66, 0.2);
}

.status-maintenance::before {
  content: '●';
  font-size: 0.5rem;
}

.status-academic {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border: 1px solid rgba(91, 141, 238, 0.2);
}

.status-academic::before {
  content: '●';
  font-size: 0.5rem;
}

/* Placeholder card */
.project-card.placeholder {
  border: 1px dashed var(--color-border);
  background: transparent;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 200px;
  gap: var(--space-4);
  cursor: default;
}

.project-card.placeholder:hover {
  border-color: var(--color-border);
  transform: none;
}

.project-card.placeholder::before {
  display: none;
}

.placeholder-icon {
  font-family: var(--font-mono);
  font-size: 2rem;
  color: var(--color-border);
}

.placeholder-text {
  font-size: 0.85rem;
  color: var(--color-muted);
  max-width: 22ch;
  line-height: 1.6;
}


/* ─── Contact ─────────────────────────────────────────────── */
.contact {
  padding: var(--space-20) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.contact-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  text-align: center;
}

.contact-label {
  justify-content: center;
}

.contact-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--color-text);
  font-weight: 400;
  margin-bottom: var(--space-4);
}

.contact-subtitle {
  font-size: 0.95rem;
  color: var(--color-muted);
  max-width: 50ch;
  margin: 0 auto var(--space-10);
  line-height: 1.75;
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-muted);
  transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  font-family: var(--font-mono);
}

.contact-link:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.contact-icon {
  font-size: 1.1rem;
}

.contact-cv-note {
  font-size: 0.8rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

/* ─── Footer ──────────────────────────────────────────────── */
.footer {
  padding: var(--space-8) var(--space-6);
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.footer-email {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  transition: opacity var(--transition-fast);
}

.footer-email:hover {
  opacity: 0.8;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}


/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(13, 15, 20, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-5);
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-links a {
    font-size: 1rem;
  }

  .nav-menu-btn {
    display: flex;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .terminal {
    margin-bottom: 0;
  }

  .about-inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .about-right {
    order: -1;
  }

  .about-photo {
    max-width: 180px;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }

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

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .hero-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .container,
  .hero-inner,
  .about-inner,
  .skills-inner,
  .experience-inner,
  .projects-inner,
  .contact-inner {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}