/* ==============================
   THEME VARIABLES
   ============================== */
:root {
  --bg:           #FFFFFF;
  --bg-light:     #F7F9FC;
  --bg-card:      #FFFFFF;
  --text:         #1A202C;
  --text-muted:   #4A5568;
  --text-subtle:  #718096;
  --primary:      #1B4B8A;
  --primary-h:    #153a6e;
  --accent:       #2B6FD6;
  --border:       #E2E8F0;
  --border-s:     #CBD5E0;
  --navbar-bg:    #FFFFFF;
  --footer-bg:    #1A202C;
  --footer-text:  #A0AEC0;
  --footer-link:  #CBD5E0;
  --footer-copy:  #4A5568;
  --tag-bg:       #EBF4FF;
  --tag-color:    #1B4B8A;
}

[data-theme="dark"] {
  --bg:           #0F172A;
  --bg-light:     #1E293B;
  --bg-card:      #1E293B;
  --text:         #F1F5F9;
  --text-muted:   #CBD5E0;
  --text-subtle:  #94A3B8;
  --primary:      #3B82F6;
  --primary-h:    #2563EB;
  --accent:       #60A5FA;
  --border:       #334155;
  --border-s:     #475569;
  --navbar-bg:    #0F172A;
  --footer-bg:    #020617;
  --footer-text:  #64748B;
  --footer-link:  #94A3B8;
  --footer-copy:  #334155;
  --tag-bg:       #1E3A5F;
  --tag-color:    #60A5FA;
}

/* ==============================
   RESET & BASE
   ============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

ul {
  list-style: none;
}

/* ==============================
   LAYOUT
   ============================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 64px 0;
}

.section-inner {
  max-width: 960px;
  margin: 0 auto;
}

.bg-light {
  background-color: #F7F9FC;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: #1B4B8A;
  margin-bottom: 48px;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background-color: #2B6FD6;
  margin-top: 12px;
}

/* ==============================
   NAVBAR
   ============================== */
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #FFFFFF;
  border-bottom: 1px solid #E2E8F0;
  padding: 12px 0;
}

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


.nav-logo-img {
  height: 36px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: #4A5568;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #1B4B8A;
}

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 2px solid #1B4B8A;
  border-radius: 6px;
  padding: 3px 8px;
}

.lang-divider {
  color: #CBD5E0;
  font-size: 0.8rem;
  user-select: none;
}

.lang-opt {
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: #A0AEC0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color 0.2s;
}

.lang-opt img {
  border-radius: 2px;
  display: inline-block;
}

.lang-opt:hover {
  color: #1B4B8A;
}

.lang-opt.active {
  color: #1B4B8A;
}

/* ==============================
   HERO
   ============================== */
.hero {
  text-align: center;
  padding: 100px 0 80px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.hero-logo {
  width: 360px;
  height: auto;
  margin-bottom: 8px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  color: #1A202C;
  letter-spacing: -0.5px;
}

.hero-role {
  font-size: 1.4rem;
  font-weight: 500;
  color: #2B6FD6;
}

.hero-tagline {
  font-size: 1.1rem;
  color: #718096;
  max-width: 520px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

/* ==============================
   BUTTONS
   ============================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
}

.btn-primary {
  background-color: #1B4B8A;
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: #153a6e;
}

.btn-secondary {
  background-color: #1B4B8A;
  color: #FFFFFF;
}

.btn-secondary:hover {
  background-color: #153a6e;
}

.btn-email {
  background-color: #1B4B8A;
  color: #FFFFFF;
}

.btn-email:hover {
  background-color: #153a6e;
}

.btn-whatsapp {
  background-color: #1B4B8A;
  color: #FFFFFF;
}

.btn-whatsapp:hover {
  background-color: #153a6e;
}

/* ==============================
   ABOUT
   ============================== */
.about-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
}

.about-photo {
  flex-shrink: 0;
}

.about-photo img {
  width: 240px;
  height: 240px;
  object-fit: cover;
  border-radius: 16px;
  display: block;
}

.about-body {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
  color: #4A5568;
  line-height: 1.8;
}

.about-stats {
  display: flex;
  gap: 48px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: #1B4B8A;
  line-height: 1;
}

.stat-label {
  font-size: 0.85rem;
  color: #718096;
  font-weight: 500;
}

/* ==============================
   EXPERIENCE
   ============================== */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.experience-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding: 32px;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  transition: box-shadow 0.2s;
}

.experience-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07);
}

.experience-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}

.experience-logo img {
  max-width: 100%;
  max-height: 72px;
  object-fit: contain;
}

.experience-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 4px;
}

.experience-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1A202C;
}

.experience-period {
  font-size: 0.82rem;
  color: #718096;
  white-space: nowrap;
  font-weight: 500;
}

.experience-company {
  font-size: 0.9rem;
  color: #2B6FD6;
  font-weight: 500;
  margin-bottom: 12px;
}

.experience-desc {
  font-size: 0.9rem;
  color: #4A5568;
  line-height: 1.7;
  margin-bottom: 16px;
}

.experience-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tool-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  background-color: #EBF4FF;
  color: #1B4B8A;
  border-radius: 4px;
}

/* ==============================
   TOOLS
   ============================== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 20px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 16px;
  background-color: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.tool-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07);
  transform: translateY(-2px);
}

.tool-card img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.tool-card span {
  font-size: 0.78rem;
  font-weight: 600;
  color: #4A5568;
  text-align: center;
}

/* ==============================
   CERTIFICATIONS
   ============================== */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.cert-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
  cursor: pointer;
  color: inherit;
  text-decoration: none;
}

.cert-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  border-color: #1B4B8A;
  transform: translateY(-2px);
}

.cert-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #F7F9FC;
  border-radius: 10px;
  padding: 10px;
}

.cert-info h3 {
  font-size: 0.92rem;
  font-weight: 600;
  color: #1A202C;
  margin-bottom: 4px;
}

.cert-issuer {
  font-size: 0.82rem;
  color: #718096;
  margin-bottom: 8px;
}

.cert-year {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  background-color: #EBF4FF;
  color: #1B4B8A;
  border-radius: 4px;
}

/* ==============================
   PROJECTS
   ============================== */
.projects-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.project-card {
  background-color: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 16px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.project-card:hover {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

/* Diagram */
.project-diagram {
  background-color: #F7F9FC;
  border-bottom: 1px solid #E2E8F0;
  padding: 28px 32px;
  overflow-x: auto;
}

.etl-pipeline {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 560px;
}

.etl-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.etl-stage-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #718096;
}

.etl-stage-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  background-color: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 10px;
  min-width: 100px;
}

.etl-formats {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  justify-content: center;
}

.fmt {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
}

.fmt-xlsx { background-color: #E6F4EA; color: #2E7D32; }
.fmt-docx { background-color: #E8F0FE; color: #1A56DB; }
.fmt-pdf  { background-color: #FDE8E8; color: #C53030; }
.fmt-csv  { background-color: #EBF4FF; color: #1B4B8A; }

.etl-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
}

.duckdb-badge { background-color: #FFF3E0; color: #E65100; }
.azure-badge  { background-color: #E3F2FD; color: #0D47A1; }

.etl-arrow {
  flex-shrink: 0;
  margin-top: 20px;
}

.etl-outputs {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 20px;
}

.etl-output-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  color: #4A5568;
  padding: 6px 10px;
  background-color: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 6px;
  white-space: nowrap;
}

.etl-output-item svg {
  color: #2B6FD6;
  flex-shrink: 0;
}

/* Info */
.project-info {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1A202C;
}

.project-type {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  background-color: #EBF4FF;
  color: #1B4B8A;
  border-radius: 20px;
}

.project-desc {
  font-size: 0.9rem;
  color: #4A5568;
  line-height: 1.75;
}

.project-highlights {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: #4A5568;
}

.highlight-item svg {
  color: #2B6FD6;
  flex-shrink: 0;
}

.project-github-btn {
  align-self: flex-start;
}

/* ==============================
   FOOTER
   ============================== */
.footer {
  background-color: #1A202C;
  color: #A0AEC0;
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-email {
  color: #CBD5E0;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-email:hover {
  color: #FFFFFF;
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  color: #CBD5E0;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-copy {
  font-size: 0.78rem;
  color: #4A5568;
}

/* ==============================
   THEME TOGGLE BUTTON
   ============================== */
.theme-toggle {
  background: transparent;
  border: 2px solid var(--primary);
  border-radius: 6px;
  padding: 5px 8px;
  cursor: pointer;
  color: var(--primary);
  display: flex;
  align-items: center;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background-color: var(--primary);
  color: #FFFFFF;
}

.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* ==============================
   DARK MODE OVERRIDES
   ============================== */
[data-theme="dark"] .bg-light           { background-color: var(--bg-light); }
[data-theme="dark"] .navbar             { background-color: var(--navbar-bg); border-bottom-color: var(--border); }
[data-theme="dark"] .nav-links a        { color: var(--text-subtle); }
[data-theme="dark"] .nav-links a:hover  { color: var(--accent); }
[data-theme="dark"] .nav-links          { border-top-color: var(--border); }
[data-theme="dark"] .lang-switcher      { border-color: var(--primary); }
[data-theme="dark"] .lang-opt           { color: var(--text-subtle); }
[data-theme="dark"] .lang-opt:hover,
[data-theme="dark"] .lang-opt.active    { color: var(--accent); }
[data-theme="dark"] .lang-divider       { color: var(--border); }

[data-theme="dark"] .section-title         { color: var(--accent); }
[data-theme="dark"] .section-title::after  { background-color: var(--primary); }
[data-theme="dark"] .hero-role             { color: var(--accent); }
[data-theme="dark"] .hero-tagline          { color: var(--text-subtle); }
[data-theme="dark"] .hero h1               { color: var(--text); }

[data-theme="dark"] .about-text            { color: var(--text-muted); }
[data-theme="dark"] .stat-number           { color: var(--accent); }
[data-theme="dark"] .stat-label            { color: var(--text-subtle); }

[data-theme="dark"] .experience-card       { border-color: var(--border); background-color: var(--bg-card); transition: background-color 0.3s, border-color 0.3s; }
[data-theme="dark"] .experience-card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
[data-theme="dark"] .experience-header h3  { color: var(--text); }
[data-theme="dark"] .experience-company    { color: var(--accent); }
[data-theme="dark"] .experience-desc       { color: var(--text-muted); }
[data-theme="dark"] .experience-period     { color: var(--text-subtle); }

[data-theme="dark"] .tool-tag              { background-color: var(--tag-bg); color: var(--tag-color); }
[data-theme="dark"] .tool-card             { background-color: var(--bg-card); border-color: var(--border); }
[data-theme="dark"] .tool-card span        { color: var(--text-muted); }
[data-theme="dark"] .tool-card:hover       { box-shadow: 0 4px 20px rgba(0,0,0,0.3); }

[data-theme="dark"] .cert-card             { border-color: var(--border); background-color: var(--bg-card); transition: background-color 0.3s, border-color 0.3s, transform 0.2s; }
[data-theme="dark"] .cert-card:hover       { border-color: var(--primary); box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
[data-theme="dark"] .cert-info h3          { color: var(--text); }
[data-theme="dark"] .cert-issuer           { color: var(--text-subtle); }
[data-theme="dark"] .cert-year             { background-color: var(--tag-bg); color: var(--tag-color); }
[data-theme="dark"] .cert-icon             { background-color: var(--bg-light); }

[data-theme="dark"] .project-card          { border-color: var(--border); background-color: var(--bg-card); }
[data-theme="dark"] .project-diagram       { background-color: var(--bg-light); border-bottom-color: var(--border); }
[data-theme="dark"] .etl-stage-body        { background-color: var(--bg); border-color: var(--border); }
[data-theme="dark"] .etl-stage-label       { color: var(--text-subtle); }
[data-theme="dark"] .etl-output-item       { background-color: var(--bg); border-color: var(--border); color: var(--text-muted); }
[data-theme="dark"] .project-title         { color: var(--text); }
[data-theme="dark"] .project-desc          { color: var(--text-muted); }
[data-theme="dark"] .project-type          { background-color: var(--tag-bg); color: var(--tag-color); }
[data-theme="dark"] .highlight-item        { color: var(--text-muted); }
[data-theme="dark"] .highlight-item svg    { color: var(--accent); }
[data-theme="dark"] .etl-output-item svg   { color: var(--accent); }

[data-theme="dark"] .footer                { background-color: var(--footer-bg); }
[data-theme="dark"] .footer-email          { color: var(--footer-link); }
[data-theme="dark"] .footer-links a        { color: var(--footer-link); }
[data-theme="dark"] .footer-copy           { color: var(--footer-copy); }

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 768px) {
  .nav-inner {
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 4px;
    border-top: 1px solid #E2E8F0;
  }

  .nav-links a {
    font-size: 0.82rem;
  }

  .lang-switcher {
    margin-left: auto;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-photo img {
    width: 180px;
    height: 180px;
    margin: 0 auto;
  }

  .hero {
    padding: 72px 0 60px;
  }

  .hero-logo {
    width: 220px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.6rem;
    margin-bottom: 36px;
  }

  .experience-card {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .experience-logo {
    justify-content: flex-start;
    padding: 0;
  }

  .experience-logo img {
    max-height: 52px;
  }

  .about-stats {
    gap: 40px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .about-stats {
    flex-direction: column;
    gap: 28px;
  }

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