:root {
  --color-primary: #1755cf;
  --color-primary-dark: #1244a3;
  --color-accent: #4ECE99;
  --color-accent-dark: #399670;
  --color-text: #345;
  --color-text-light: #6b7c8d;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-border: #e5e7eb;
  --color-error: #ef6565;
  --color-success: #4ECE99;

  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Roboto', sans-serif;

  --font-size-hero: clamp(2.5rem, 5vw, 4rem);
  --font-size-h1: clamp(2rem, 4vw, 3rem);
  --font-size-h2: clamp(1.5rem, 3vw, 2rem);
  --font-size-h3: clamp(1.125rem, 2vw, 1.5rem);
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-section: clamp(4rem, 8vw, 8rem);

  --max-width: 1100px;
  --nav-height: 64px;
  --border-radius: 8px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

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

ul {
  list-style: none;
}

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

.section {
  padding: var(--space-section) 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section__title {
  font-size: var(--font-size-h1);
  margin-bottom: var(--space-xl);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

/* ---- NAVIGATION ---- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.nav--scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

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

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.nav__logo:hover {
  color: var(--color-primary);
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav__link {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link--active::after,
.nav__link:hover::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-text);
}

.nav__toggle svg {
  width: 24px;
  height: 24px;
}

/* ---- HERO ---- */

.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-xl);
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f0f4ff 100%);
}

.hero__content {
  max-width: 700px;
}

.hero__prompt {
  display: none;
}

.hero__photo {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-lg);
  border: 4px solid var(--color-bg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.hero__name {
  font-size: var(--font-size-hero);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.hero__title {
  font-size: var(--font-size-h3);
  font-weight: 300;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.hero__tagline {
  font-size: var(--font-size-body);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-xl);
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

/* ---- BUTTONS ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-family: var(--font-body);
  font-size: var(--font-size-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--border-radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* ---- SOCIAL LINKS ---- */

.social-links {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  color: var(--color-text-light);
  transition: all var(--transition);
}

.social-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.social-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ---- ABOUT ---- */

.about__text {
  max-width: 800px;
}

.about__text p {
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

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

/* ---- SKILLS ---- */

.skills__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.skill-card {
  padding: var(--space-lg);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: all var(--transition);
}

.skill-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.skill-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.skill-card p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  line-height: 1.6;
}

.skills__category {
  margin-bottom: var(--space-xl);
}

.skills__category:last-child {
  margin-bottom: 0;
}

.skills__category-title {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.skills__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background-color: #eef2ff;
  color: var(--color-primary);
  font-size: var(--font-size-small);
  font-weight: 500;
  border-radius: 100px;
  border: 1px solid #dbeafe;
}

.tag--accent {
  background-color: #ecfdf5;
  color: var(--color-accent-dark);
  border-color: #d1fae5;
}

/* ---- IMPACT METRICS ---- */

.metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.metric {
  text-align: center;
}

.metric__number {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.metric__label {
  display: block;
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  max-width: 280px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .metrics {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---- EXPERIENCE ---- */

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

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-xl);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(-2rem + -5px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline__date {
  font-size: var(--font-size-small);
  color: var(--color-accent-dark);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.timeline__title {
  font-size: var(--font-size-h3);
  margin-bottom: var(--space-xs);
}

.timeline__company {
  font-size: var(--font-size-body);
  color: var(--color-text-light);
  font-weight: 400;
  margin-bottom: var(--space-md);
}

.timeline__list {
  list-style: disc;
  padding-left: 1.25rem;
}

.timeline__list li {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  font-size: var(--font-size-small);
  line-height: 1.6;
}

.timeline__section-title {
  font-size: var(--font-size-h2);
  margin-bottom: var(--space-lg);
  margin-top: var(--space-xl);
  color: var(--color-text);
}

.timeline__section-title:first-child {
  margin-top: 0;
}

/* ---- CERTIFICATIONS ---- */

.certifications {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.5rem 1rem;
  background-color: #fefce8;
  color: #854d0e;
  font-size: var(--font-size-small);
  font-weight: 500;
  border-radius: var(--border-radius);
  border: 1px solid #fef08a;
}

/* ---- CONTACT ---- */

.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(23, 85, 207, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-message {
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  font-size: var(--font-size-small);
  display: none;
}

.form-message--success {
  display: block;
  background-color: #ecfdf5;
  color: #065f46;
  border: 1px solid #d1fae5;
}

.form-message--error {
  display: block;
  background-color: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact__info h3 {
  font-size: var(--font-size-h3);
  margin-bottom: var(--space-sm);
}

.contact__info p {
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
}

.contact__social {
  display: flex;
  gap: var(--space-md);
}

.contact__social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-weight: 500;
  font-size: var(--font-size-small);
  text-decoration: none;
  transition: all var(--transition);
}

.contact__social-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.contact__social-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ---- FOOTER ---- */

.footer {
  padding: var(--space-xl) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer p {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
}

.footer__verse {
  margin-top: var(--space-sm);
  font-style: italic;
  font-size: var(--font-size-small);
  color: var(--color-text-light);
}

/* ---- HONEYPOT ---- */

.form-hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

/* ---- RESPONSIVE: TABLET ---- */

@media (min-width: 768px) {
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .form-row {
    grid-template-columns: 1fr 1fr;
  }

  .contact__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .nav__toggle {
    display: none;
  }
}

/* ---- RESPONSIVE: DESKTOP ---- */

@media (min-width: 1024px) {
  .skills__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero__photo {
    width: 180px;
    height: 180px;
  }
}

/* ---- MOBILE NAV ---- */

@media (max-width: 767px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    gap: 0;
  }

  .nav__links--open {
    display: flex;
  }

  .nav__link {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    width: 100%;
  }

  .nav__link:last-child {
    border-bottom: none;
  }
}

/* ---- SCROLL ANIMATIONS ---- */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- REDUCED MOTION ---- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}