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

:root {
  --navy:         #0a1628;
  --navy-mid:     #0f1f3d;
  --navy-light:   #162847;
  --navy-border:  #1e3458;
  --steel:        #4a90c4;
  --steel-light:  #6aabdb;
  --steel-dim:    #2d6a9f;
  --white:        #ffffff;
  --off-white:    #e8edf5;
  --muted:        #8fa3c0;
  --muted-dark:   #5a7299;
  --accent:       #4a90c4;
  --green:        #3ecf8e;

  --font:         'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nav-h:        64px;
  --max-w:        1140px;
  --section-py:   100px;
}

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

body {
  font-family: var(--font);
  background-color: var(--navy);
  color: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--steel);
  color: var(--white);
}

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

/* ============================================================
   SCROLL ANIMATIONS
============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay {
  transition-delay: 0.18s;
}

/* ============================================================
   NAVIGATION
============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: transparent;
  transition: background 0.35s ease, border-bottom 0.35s ease;
}

#navbar.scrolled {
  background: rgba(10, 22, 40, 0.96);
  border-bottom: 1px solid var(--navy-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--steel-light);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  flex: 1;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.2s;
}

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

.nav-cta {
  flex-shrink: 0;
  padding: 8px 20px;
  background: transparent;
  border: 1px solid var(--steel);
  border-radius: 3px;
  color: var(--steel-light);
  font-family: var(--font);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.nav-cta:hover {
  background: var(--steel);
  color: var(--white);
}

/* ============================================================
   HERO
============================================================ */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--nav-h) 32px 0;
  position: relative;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(74,144,196,0.1) 0%, transparent 70%),
    var(--navy);
}

#hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Ccircle cx='30' cy='30' r='0.75' fill='rgba(74,144,196,0.15)'/%3E%3C/svg%3E");
  pointer-events: none;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-eyebrow {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--steel);
  margin-bottom: 20px;
}

.hero-name {
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--white);
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(0.9rem, 2vw, 1.125rem);
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-bottom: 24px;
}

.hero-bio {
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  color: var(--off-white);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.75;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 13px 32px;
  background: var(--steel);
  border: none;
  border-radius: 3px;
  color: var(--white);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover {
  background: var(--steel-light);
  transform: translateY(-1px);
}

.btn-outline {
  padding: 13px 32px;
  background: transparent;
  border: 1px solid var(--navy-border);
  border-radius: 3px;
  color: var(--off-white);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
}

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

/* Hero stats bar */
.hero-stats {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0;
  margin-top: 72px;
  padding: 28px 48px;
  background: var(--navy-mid);
  border: 1px solid var(--navy-border);
  border-radius: 4px;
  width: 100%;
  max-width: 860px;
}

.stat-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}

.stat-number {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.stat-sub {
  display: block;
  font-size: 0.6875rem;
  color: var(--muted-dark);
  text-transform: none;
  letter-spacing: 0;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--navy-border);
  flex-shrink: 0;
  margin: 0 8px;
}


/* ============================================================
   SHARED SECTION STYLES
============================================================ */
.section-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-py) 32px;
}

.section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--steel);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-heading {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-bottom: 56px;
}

/* ============================================================
   ABOUT
============================================================ */
#about {
  background: var(--navy);
  border-top: 1px solid var(--navy-border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  font-size: 0.9375rem;
  color: var(--off-white);
  line-height: 1.8;
  margin-bottom: 20px;
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* Skills card */
.skills-card {
  background: var(--navy-mid);
  border: 1px solid var(--navy-border);
  border-radius: 4px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.skills-group-title {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--muted-dark);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 5px 12px;
  background: var(--navy-light);
  border: 1px solid var(--navy-border);
  border-radius: 3px;
  font-size: 0.8125rem;
  color: var(--off-white);
  font-weight: 500;
}

.tag-alt {
  border-color: var(--steel-dim);
  color: var(--steel-light);
  background: rgba(74,144,196,0.08);
}

.language-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lang-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--navy-border);
}

.lang-row:last-child {
  border-bottom: none;
}

.lang-name {
  font-size: 0.875rem;
  color: var(--off-white);
  font-weight: 500;
}

.lang-level {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ============================================================
   PROJECTS
============================================================ */
#projects {
  background: var(--navy-mid);
  border-top: 1px solid var(--navy-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.project-card {
  background: var(--navy);
  border: 1px solid var(--navy-border);
  border-radius: 4px;
  transition: border-color 0.25s, transform 0.25s;
}

.project-card:hover {
  border-color: var(--steel-dim);
  transform: translateY(-3px);
}

.project-card-inner {
  padding: 28px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.project-lang-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--steel);
  text-transform: uppercase;
  padding: 3px 10px;
  border: 1px solid var(--steel-dim);
  border-radius: 2px;
  background: rgba(74,144,196,0.08);
}

.project-link-icon {
  color: var(--muted-dark);
  transition: color 0.2s;
  display: flex;
  align-items: center;
}

.project-link-icon svg {
  width: 16px;
  height: 16px;
}

.project-link-icon:hover {
  color: var(--white);
}

.project-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 24px;
}

.project-footer {
  margin-top: auto;
}

.project-btn {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--steel-light);
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--steel-dim);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.project-btn:hover {
  color: var(--white);
  border-color: var(--white);
}

/* GitHub banner */
.github-banner {
  background: var(--navy);
  border: 1px solid var(--navy-border);
  border-radius: 4px;
  overflow: hidden;
}

.github-banner-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 28px;
}

.github-icon {
  width: 24px;
  height: 24px;
  color: var(--muted);
  flex-shrink: 0;
}

.github-banner-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.github-handle {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.02em;
}

.github-meta {
  font-size: 0.8125rem;
  color: var(--muted);
}

.github-profile-btn {
  flex-shrink: 0;
  padding: 9px 20px;
  border: 1px solid var(--navy-border);
  border-radius: 3px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--off-white);
  letter-spacing: 0.04em;
  transition: border-color 0.2s, color 0.2s;
}

.github-profile-btn:hover {
  border-color: var(--steel);
  color: var(--white);
}

/* ============================================================
   EDUCATION & CERTIFICATIONS
============================================================ */
#education {
  background: var(--navy);
  border-top: 1px solid var(--navy-border);
}

.cred-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}

.cred-column-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-dark);
  margin-bottom: 32px;
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 1px solid var(--navy-border);
  padding-left: 28px;
}

.timeline-item {
  position: relative;
  padding-bottom: 36px;
}

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

.timeline-dot {
  position: absolute;
  left: -35px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--navy-border);
  border: 2px solid var(--navy);
  box-shadow: 0 0 0 1px var(--navy-border);
}

.timeline-dot-accent {
  background: var(--steel);
  border-color: var(--navy);
  box-shadow: 0 0 0 1px var(--steel-dim), 0 0 10px rgba(74,144,196,0.3);
}

.timeline-badge {
  display: inline-block;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: 6px;
}

.timeline-badge.active {
  background: rgba(62,207,142,0.12);
  color: var(--green);
  border: 1px solid rgba(62,207,142,0.25);
}

.timeline-badge.in-progress {
  background: rgba(74,144,196,0.12);
  color: var(--steel-light);
  border: 1px solid rgba(74,144,196,0.25);
}

.timeline-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
  line-height: 1.35;
}

.timeline-institution {
  font-size: 0.875rem;
  color: var(--steel-light);
  margin-bottom: 4px;
}

.timeline-sub {
  font-size: 0.8125rem;
  color: var(--muted);
}

/* ============================================================
   CONTACT
============================================================ */
#contact {
  background: var(--navy-mid);
  border-top: 1px solid var(--navy-border);
}

.contact-wrapper {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.contact-statement {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--off-white);
  line-height: 1.75;
  margin-bottom: 48px;
  font-weight: 400;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  background: var(--navy);
  border: 1px solid var(--navy-border);
  border-radius: 3px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--off-white);
  letter-spacing: 0.02em;
  width: 100%;
  max-width: 380px;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.contact-btn:hover {
  border-color: var(--steel);
  color: var(--white);
  background: var(--navy-light);
}

.contact-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--steel);
}

/* ============================================================
   FOOTER
============================================================ */
#footer {
  background: var(--navy);
  border-top: 1px solid var(--navy-border);
  padding: 24px 32px;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--muted-dark);
  letter-spacing: 0.04em;
}

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

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 900px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .about-grid,
  .cred-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
    padding: 24px 28px;
  }

  .stat-divider {
    display: none;
  }

  .stat-item {
    flex: 0 0 calc(50% - 12px);
  }
}

@media (max-width: 640px) {
  :root {
    --section-py: 72px;
  }

  .nav-links {
    display: none;
  }

  .section-container {
    padding: var(--section-py) 20px;
  }

  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 24px;
  }

  .stat-item {
    flex: none;
    flex-direction: row;
    gap: 12px;
    text-align: left;
  }

  .stat-number {
    font-size: 1.25rem;
    min-width: 60px;
  }

  .github-banner-inner {
    flex-wrap: wrap;
    gap: 12px;
  }
}