:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-alt: #eef2fb;
  --text: #1c2533;
  --text-primary: #101c36;
  --muted: #5a6573;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --highlight: #f59e0b;
  --border: #d6deeb;
  --shadow: 0 18px 45px rgba(28, 37, 51, 0.12);
  --radius-sm: 10px;
  --radius-lg: 18px;
  --transition: 0.3s ease;
}

body.dark-mode {
  --bg: #0f172a;
  --surface: #101c36;
  --surface-alt: #1a2642;
  --text: #e2e8f0;
  --text-primary: #ffffff;
  --muted: #94a3b8;
  --accent: #60a5fa;
  --accent-dark: #3b82f6;
  --highlight: #facc15;
  --border: rgba(148, 163, 184, 0.2);
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Poppins', 'Segoe UI', sans-serif;
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.08), transparent 28%), var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background 0.4s ease, color 0.4s ease;
  min-height: 100vh;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

a:hover {
  color: var(--accent);
}

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

.container {
  width: min(1140px, 92vw);
  margin: 0 auto;
}

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
  border-bottom: 1px solid rgba(37, 99, 235, 0.08);
  transition: background 0.4s ease, border-color 0.4s ease;
}

body.dark-mode header {
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.86), rgba(15, 23, 42, 0.68));
  border-color: rgba(96, 165, 250, 0.2);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.65rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.logo i {
  color: var(--accent);
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

main {
  padding-top: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(37, 99, 235, 0.12);
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-sm);
  border: none;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 12px 25px rgba(37, 99, 235, 0.2);
}

.btn:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(37, 99, 235, 0.12);
  color: var(--accent);
  box-shadow: none;
  border-radius: 20px;
  padding: 0.65rem 1.25rem;
  border: none;
}

.btn-secondary:hover {
  background: rgba(37, 99, 235, 0.22);
}

.theme-toggle {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(37, 99, 235, 0.25);
  display: grid;
  place-items: center;
  background: var(--surface);
  color: var(--accent);
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.18);
}

.theme-toggle__icon {
  color: var(--text-primary);
  font-size: 1.2rem;
  line-height: 1;
  transition: color 0.3s ease;
}

body.dark-mode .theme-toggle__icon {
  color: #ffffff;
}

section {
  padding: clamp(2.75rem, 8vw, 5.5rem) 0;
  scroll-margin-top: clamp(70px, 12vw, 110px);
}

.section-heading {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.section-heading::before {
  content: '';
  width: 36px;
  height: 2px;
  background: var(--accent);
}

.section-title {
  font-size: clamp(2rem, 3vw, 2.75rem);
  margin-bottom: 1rem;
  color: var(--text);
}

.section-subtitle {
  max-width: 680px;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  align-items: center;
  padding-top: clamp(2.5rem, 10vw, 6rem);
}

.hero-copy {
  display: grid;
  gap: 1.5rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 3.8rem);
  font-weight: 700;
  line-height: 1.1;
}

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

.hero-description {
  max-width: 580px;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 1.2rem;
  align-self: stretch;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.65rem;
}

.stat-card span {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skill-column {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 1rem;
}

.skill-column h3 {
  margin: 0;
  font-size: 1.1rem;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.chip {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 500;
}

.skill-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.skill-list li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--muted);
  font-weight: 500;
}

.skill-list li i {
  color: var(--accent);
  font-size: 0.95rem;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.service-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 1.25rem;
  border: 1px solid transparent;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.25);
  box-shadow: 0 22px 45px rgba(37, 99, 235, 0.18);
}

.service-card h3 {
  margin: 0;
  font-size: 1.2rem;
}

.service-card p {
  color: var(--muted);
  margin: 0;
}

.service-card ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  display: grid;
  gap: 0.6rem;
}

.service-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85rem;
}

.playbook-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.playbook-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 1.8rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.75rem;
}

.playbook-card span {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.playbook-card p {
  margin: 0;
  color: var(--muted);
}

.timeline {
  border-left: 2px solid var(--border);
  margin-left: 0.5rem;
  display: grid;
  gap: 2.5rem;
}

.timeline-item {
  position: relative;
  padding-left: 2rem;
}

.timeline-item::before {
  content: '';
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  position: absolute;
  left: -7px;
  top: 6px;
}

.timeline-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  display: grid;
  gap: 0.9rem;
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

.timeline-role {
  font-size: 1.1rem;
  font-weight: 600;
}

.timeline-meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.bullet-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.bullet-list li {
  margin-bottom: 0.55rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 500;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.project-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 420px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 45px rgba(37, 99, 235, 0.18);
}

.project-media {
  position: relative;
  padding-top: 60%;
  background: var(--surface-alt);
}

.project-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-body {
  padding: 1.5rem;
  display: grid;
  gap: 0.75rem;
}

.project-title {
  font-size: 1.2rem;
  font-weight: 600;
}


.project-entry__preview {
  margin: 0;
  border-radius: calc(var(--radius-md) - 4px);
  overflow: hidden;
  border: 1px solid rgba(37, 99, 235, 0.12);
  background: var(--surface-alt);
  box-shadow: var(--shadow);
}

.project-entry__preview img {
  display: block;
  width: 100%;
  height: auto;
}

body.dark-mode .project-entry__preview {
  border-color: rgba(96, 165, 250, 0.25);
  background: rgba(15, 23, 42, 0.75);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.35);
}
.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.project-description {
  color: var(--muted);
  margin: 0;
}

.project-links {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
}

.project-links a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.project-links i {
  margin-left: 0.35rem;
}

.project-entry {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), transparent);
  border-radius: var(--radius-md);
  padding: 1.6rem 1.75rem;
  display: grid;
  gap: 1rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  transition: border-color var(--transition), background var(--transition);
}

.dark-mode .project-entry {
  background: rgba(15, 23, 42, 0.65);
}

.project-entry:hover {
  border-color: rgba(37, 99, 235, 0.65);
  background: rgba(37, 99, 235, 0.08);
}

.dark-mode .project-entry:hover {
  background: rgba(37, 99, 235, 0.16);
}

.project-entry__header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  align-items: flex-start;
  justify-content: space-between;
}

.project-entry__title {
  display: grid;
  gap: 0.35rem;
}

.project-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--accent);
}

.project-summary {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.project-insights {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.5rem;
  color: var(--muted);
}

.project-entry .tag-list {
  justify-content: flex-start;
}

.project-entry .project-links {
  margin-top: 0.25rem;
}

.project-entry .project-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.hidden {
  display: none !important;
}

.fun-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.fact-card {
  background: var(--surface);
  padding: 1.8rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  color: var(--muted);
}

.fact-card span {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.education-section {
  display: grid;
  gap: 2rem;
}

.education-card,
.cert-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  padding: 1.6rem;
}

.education-card h3,
.cert-card h3 {
  margin-top: 0;
  margin-bottom: 0.35rem;
}

.education-meta,
.cert-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.contact-section {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.18), rgba(37, 99, 235, 0.03));
}

.contact-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  align-items: start;
}

.contact-details {
  display: grid;
  gap: 1rem;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  color: var(--muted);
}

.contact-list li i {
  color: var(--accent);
  margin-right: 0.6rem;
}

.social-links {
  display: flex;
  gap: 0.85rem;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-primary);
  transition: all 0.25s ease;
}

.social-links a::before {
  content: attr(data-label);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

body.dark-mode .social-links a {
  border-color: rgba(255, 255, 255, 0.36);
  color: rgba(255, 255, 255, 0.88);
}

.social-links a:hover {
  background: var(--accent);
  color: #fff;
}

.social-links a i {
  display: none;
  color: inherit;
  font-size: 1.1rem;
  line-height: 1;
}

body.fontawesome-ready .social-links a::before {
  content: '';
  display: none;
}

body.fontawesome-ready .social-links a i {
  display: inline-flex;
}

body.dark-mode .social-links a:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.6);
  color: #ffffff;
}

.contact-form {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: grid;
  gap: 1rem;
  padding: 2rem;
}

.contact-form label {
  font-weight: 600;
  font-size: 0.9rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

body.dark-mode .contact-form input,
body.dark-mode .contact-form textarea {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(96, 165, 250, 0.35);
  color: var(--text);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(28, 37, 51, 0.45);
}

body.dark-mode .contact-form input::placeholder,
body.dark-mode .contact-form textarea::placeholder {
  color: rgba(226, 232, 240, 0.55);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

body.dark-mode .contact-form input:focus,
body.dark-mode .contact-form textarea:focus {
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.35);
}

.contact-form textarea {
  min-height: 160px;
  resize: vertical;
}

footer {
  padding: 2rem 0;
  border-top: 1px solid rgba(37, 99, 235, 0.1);
  color: var(--muted);
  text-align: center;
}

footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
}

.visible {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

.portfolio-item,
.fun-facts .fact-card,
.contact-container > * {
  opacity: 0;
  transform: translateY(24px);
  transition: transform 0.6s ease, opacity 0.6s ease;
}

.visible.portfolio-item,
.visible.fact-card,
.visible.contact-details,
.visible.contact-form {
  opacity: 1;
  transform: translateY(0);
}

.fun-facts.visible .fact-card,
.contact-container.visible > * {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 900px) {
  nav {
    flex-wrap: wrap;
  }

  .nav-links {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .hero {
    padding-top: clamp(3rem, 10vw, 6rem);
  }

  .hero-card {
    order: -1;
  }
}

@media (max-width: 600px) {
  header {
    position: static;
  }

  .nav-links {
    gap: 0.4rem;
  }

  .nav-links a {
    padding: 0.45rem 0.65rem;
    font-size: 0.85rem;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .btn,
  .hero-actions .btn-secondary {
    flex: 1;
    justify-content: center;
  }

  .project-card {
    min-height: 360px;
  }

  .contact-form {
    padding: 1.5rem;
  }
}