:root {
  --primary-50: #F5F3FF;
  --primary-100: #EDE9FE;
  --primary-200: #DDD6FE;
  --primary-300: #C4B5FD;
  --primary-500: #8B5CF6;
  --primary-600: #7C3AED;
  --primary-700: #6D28D9;

  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  --success-600: #059669;
  --error-600: #DC2626;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--primary-50);
  color: var(--gray-900);
  transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark {
  background-color: var(--gray-900);
  color: #fff;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

a { text-decoration: none; color: inherit; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  transition: all 0.3s ease;
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

body.dark .navbar.scrolled {
  background: rgba(17,24,39,0.95);
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.navbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: color 0.3s ease;
}

.nav-links a:hover { color: var(--gray-900); }

body.dark .nav-links a { color: var(--gray-300); }
body.dark .nav-links a:hover { color: #fff; }

.theme-toggle {
  padding: 0.5rem;
  border-radius: 999px;
  color: var(--gray-700);
  transition: background 0.3s ease;
}
.theme-toggle:hover { background: var(--gray-100); }
body.dark .theme-toggle { color: #FDE68A; }
body.dark .theme-toggle:hover { background: var(--gray-800); }

.icon-sun { display: none; }
.icon-moon { display: inline; }
body.dark .icon-sun { display: inline; }
body.dark .icon-moon { display: none; }

.mobile-controls {
  display: none;
  align-items: center;
  gap: 0.5rem;
}

.menu-toggle {
  padding: 0.5rem;
  border-radius: 6px;
  color: var(--gray-700);
}
body.dark .menu-toggle { color: var(--gray-300); }

.icon-close { display: none; }
.menu-toggle.open .icon-menu { display: none; }
.menu-toggle.open .icon-close { display: inline; }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 0.5rem 1rem 1rem;
  background: #fff;
}
body.dark .mobile-menu { background: var(--gray-900); }

.mobile-menu.open { display: flex; }

.mobile-menu a {
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-weight: 500;
  color: var(--gray-700);
}
body.dark .mobile-menu a { color: var(--gray-300); }

@media (max-width: 767px) {
  .desktop-only { display: none; }
  .mobile-controls { display: flex; }
}
@media (min-width: 768px) {
  .mobile-only { display: none; }
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding: 4rem 0;
}

.hero-wrapper {
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: 2.5rem;
}

.hero-content { max-width: 720px; }

.hero-photo-wrap {
  flex-shrink: 0;
}

.hero-photo {
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--primary-500);
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

@media (min-width: 900px) {
  .hero-wrapper {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  .hero-photo {
    width: 280px;
    height: 280px;
  }
}

.hero-greeting {
  font-size: 1.75rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--primary-600);
}

.hero-name {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.hero-typed {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 2rem;
  height: 2.5rem;
  color: var(--gray-700);
}
body.dark .hero-typed { color: var(--gray-300); }

.cursor {
  display: inline-block;
  width: 3px;
  height: 1.75rem;
  margin-left: 4px;
  background: var(--primary-500);
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

.hero-desc {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  max-width: 640px;
  color: var(--gray-700);
}
body.dark .hero-desc { color: var(--gray-300); }

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  font-weight: 500;
  padding: 0.6rem 1.5rem;
  border-radius: 999px;
  transition: all 0.3s ease;
  display: inline-block;
}

.btn-primary {
  background: var(--primary-600);
  color: #fff;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.btn-primary:hover { background: var(--primary-700); }

.btn-outline {
  border: 2px solid var(--gray-700);
  color: var(--gray-700);
}
.btn-outline:hover { background: var(--primary-100); }

body.dark .btn-outline {
  border-color: var(--gray-300);
  color: var(--gray-300);
}
body.dark .btn-outline:hover { background: var(--gray-800); }

.scroll-down {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.5rem;
  padding: 0.75rem;
  border-radius: 999px;
  color: var(--gray-700);
  animation: bounce 1.5s infinite;
}
body.dark .scroll-down { color: var(--gray-300); }

/* Sections */
.about, .contact { padding: 6rem 0; }

.about { background: #fff; }
body.dark .about { background: var(--gray-800); color: #fff; }

.contact { background: var(--primary-50); }
body.dark .contact { background: var(--gray-900); color: #fff; }

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.divider {
  width: 5rem;
  height: 4px;
  background: var(--primary-500);
  margin: 0 auto 1.5rem;
  border-radius: 2px;
}

.section-header p {
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.1rem;
  color: var(--gray-700);
}
body.dark .section-header p { color: var(--gray-300); }

.about-grid, .contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 768px) {
  .about-grid { grid-template-columns: 1fr 1fr; align-items: center; }
}
@media (min-width: 1024px) {
  .contact-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}

.about-grid h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.5rem; }
.about-grid p { margin-bottom: 1rem; color: var(--gray-700); }
body.dark .about-grid p { color: var(--gray-300); }

.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}
@media (min-width: 640px) {
  .info-grid { grid-template-columns: 1fr 1fr; }
}

.info-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--gray-700);
}
body.dark .info-item { color: var(--gray-300); }

.info-icon { color: var(--primary-500); display: inline-flex; }
.info-icon svg { width: 20px; height: 20px; }

.achievement-card {
  padding: 2rem;
  border-radius: 1rem;
  background: var(--primary-50);
}
body.dark .achievement-card { background: var(--gray-700); }

.achievement-card h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.5rem; }

.progress-block { margin-bottom: 1.5rem; }

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.progress-track {
  width: 100%;
  height: 0.5rem;
  border-radius: 999px;
  background: var(--gray-300);
  overflow: hidden;
}
body.dark .progress-track { background: var(--gray-600); }

.progress-bar {
  height: 100%;
  width: 0;
  background: var(--primary-500);
  border-radius: 999px;
  transition: width 1.5s ease-in-out;
}

.progress-note {
  font-size: 0.85rem;
  margin-top: 0.5rem;
  color: var(--gray-600);
}
body.dark .progress-note { color: var(--gray-300); }

.competencies-title { margin-top: 2rem; margin-bottom: 1rem; font-size: 1.25rem; font-weight: 700; }

.competencies-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.competency {
  padding: 0.5rem;
  border-radius: 6px;
  background: var(--primary-100);
  font-size: 0.95rem;
}
body.dark .competency { background: var(--gray-600); }

/* Contact card */
.contact-card {
  padding: 2rem;
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
body.dark .contact-card { background: var(--gray-800); box-shadow: none; }

.contact-card h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.5rem; }

.contact-info { display: flex; flex-direction: column; gap: 1.5rem; }

.contact-info-item { display: flex; align-items: flex-start; gap: 1rem; }
.contact-icon {
  color: var(--primary-500);
  font-size: 1.2rem;
  margin-top: 2px;
  display: inline-flex;
  flex-shrink: 0;
}
.contact-icon svg { width: 22px; height: 22px; }

.contact-info-item h4 { font-weight: 600; margin-bottom: 0.25rem; }
.contact-info-item p { color: var(--gray-700); }
body.dark .contact-info-item p { color: var(--gray-300); }

.follow-title { margin-top: 2.5rem; margin-bottom: 1rem; font-size: 1.25rem; font-weight: 700; }

.social-links { display: flex; gap: 1rem; }

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: var(--primary-100);
  color: var(--primary-500);
  transition: background 0.3s ease;
}
.social-btn svg { width: 18px; height: 18px; }
.social-btn:hover { background: var(--primary-200); }
body.dark .social-btn { background: var(--gray-700); }
body.dark .social-btn:hover { background: var(--gray-600); }

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1.5rem;
  color: #fff;
}
.alert-title { font-weight: 500; }
.alert-success { background: var(--success-600); }
.alert-error { background: var(--error-600); }

/* Form */
.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
@media (min-width: 640px) {
  .form-row { grid-template-columns: 1fr 1fr; }
}

.form-group { margin-bottom: 1.5rem; }
.form-row .form-group { margin-bottom: 0; }

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
}
body.dark .form-group label { color: var(--gray-300); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.6rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--gray-300);
  background: var(--gray-50);
  color: var(--gray-900);
  font-family: inherit;
  font-size: 0.95rem;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 1px var(--primary-500);
}

body.dark .form-group input,
body.dark .form-group textarea {
  background: var(--gray-700);
  border-color: var(--gray-600);
  color: #fff;
}

#submitBtn:disabled {
  background: var(--gray-300);
  cursor: not-allowed;
}

/* Footer */
.footer {
  padding: 2rem 0;
  background: #fff;
  border-top: 1px solid var(--gray-200);
}
body.dark .footer { background: var(--gray-800); border-top-color: var(--gray-700); color: #fff; }

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}

.footer-logo { font-weight: 700; font-size: 1.25rem; }

.footer-copy { color: var(--gray-700); }
body.dark .footer-copy { color: var(--gray-300); }

.footer-nav { display: flex; gap: 1.5rem; }
.footer-nav a { color: var(--gray-700); transition: color 0.3s ease; }
.footer-nav a:hover { color: var(--gray-900); }
body.dark .footer-nav a { color: var(--gray-300); }
body.dark .footer-nav a:hover { color: #fff; }

/* Animations */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, -12px); }
}

.fade-in-down {
  opacity: 0;
  animation: fadeInDown 0.7s ease forwards;
}
.delay-150 { animation-delay: 150ms; }
.delay-300 { animation-delay: 300ms; }
.delay-450 { animation-delay: 450ms; }
.delay-600 { animation-delay: 600ms; }

.about-animate, .contact-animate {
  opacity: 0;
}
.about-animate.visible, .contact-animate.visible {
  animation: fadeIn 0.7s ease forwards;
}