/* Main CSS file for Mosi Mwamba's personal website */

/* Color Variables */
:root {
  --royal-blue: #1E3A8A;
  --sky-blue: #38BDF8;
  --gold: #F59E0B;
  --white: #FFFFFF;
  --dark-blue: #0F172A;
  --light-blue: #BAE6FD;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

/* Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&family=Open+Sans:wght@300;400;600&family=Poppins:wght@300;400;500;600&display=swap');

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Open Sans', sans-serif;
  line-height: 1.6;
  color: var(--dark-blue);
  background-color: var(--white);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  color: var(--royal-blue);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
  position: relative;
  padding-bottom: 0.5rem;
}

h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 60px;
  background-color: var(--gold);
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--sky-blue);
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  display: inline-block;
}

.section-title h2::after {
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: var(--royal-blue);
  color: var(--white);
  border: none;
  border-radius: 4px;
  font-family: 'Poppins', sans-serif;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn:hover {
  background-color: var(--sky-blue);
  color: var(--dark-blue);
  transform: translateY(-3px);
  box-shadow: var(--box-shadow);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--royal-blue);
  color: var(--royal-blue);
}

.btn-outline:hover {
  background-color: var(--royal-blue);
  color: var(--white);
}

.btn-gold {
  background-color: var(--gold);
  color: var(--dark-blue);
}

.btn-gold:hover {
  background-color: #E69209;
  color: var(--white);
}

/* Header Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  padding: 0.5rem 0;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--royal-blue);
}

.logo span {
  color: var(--gold);
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 2rem;
}

.nav-links a {
  font-family: 'Poppins', sans-serif;
  font-weight: 500;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 0;
  height: 2px;
  background-color: var(--gold);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  cursor: pointer;
}

.hamburger .bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  background-color: var(--royal-blue);
  transition: var(--transition);
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background-color: rgba(56, 189, 248, 0.1);
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background-color: rgba(245, 158, 11, 0.05);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero-text {
  flex: 1;
  padding-right: 2rem;
}

.hero-text h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: var(--royal-blue);
}

.hero-text h1 span {
  color: var(--gold);
}

.hero-text h2 {
  font-size: 1.8rem;
  font-weight: 400;
  margin-bottom: 1.5rem;
  color: var(--sky-blue);
}

.hero-text p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.profile-img {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid var(--white);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.profile-img:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.social-icons {
  display: flex;
  margin-top: 1.5rem;
}

.social-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--royal-blue);
  color: var(--white);
  margin-right: 1rem;
  transition: var(--transition);
}

.social-icons a:hover {
  background-color: var(--gold);
  transform: translateY(-5px);
}

/* About Section */
.about {
  background-color: var(--white);
}

.about-content {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.about-text {
  flex: 1;
}

.about-text p {
  margin-bottom: 1.5rem;
}

.about-stats {
  flex: 1;
}

.stat-item {
  margin-bottom: 2rem;
}

.stat-title {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.stat-title h4 {
  font-family: 'Poppins', sans-serif;
  font-weight: 500;
  margin-bottom: 0;
}

.stat-bar {
  height: 10px;
  background-color: var(--gray-200);
  border-radius: 5px;
  overflow: hidden;
}

.stat-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--royal-blue) 0%, var(--sky-blue) 100%);
  border-radius: 5px;
  transition: width 1.5s ease-in-out;
}

.ei-chart-container {
  margin-top: 3rem;
  padding: 2rem;
  background-color: var(--gray-100);
  border-radius: 8px;
  box-shadow: var(--box-shadow);
}

.ei-chart-container h3 {
  text-align: center;
  margin-bottom: 1.5rem;
}

/* Experience Section */
.experience {
  background-color: var(--gray-100);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::after {
  content: '';
  position: absolute;
  width: 4px;
  background-color: var(--sky-blue);
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

.timeline-item {
  padding: 10px 40px;
  position: relative;
  width: 50%;
  box-sizing: border-box;
  margin-bottom: 2rem;
}

.timeline-item::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: var(--white);
  border: 4px solid var(--gold);
  border-radius: 50%;
  top: 15px;
  z-index: 1;
}

.timeline-item:nth-child(odd) {
  left: 0;
}

.timeline-item:nth-child(odd)::after {
  right: -12px;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-item:nth-child(even)::after {
  left: -12px;
}

.timeline-content {
  padding: 1.5rem;
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.timeline-content:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.timeline-date {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.timeline-company {
  font-weight: 600;
  color: var(--sky-blue);
  margin-bottom: 1rem;
}

/* Skills Section */
.skills {
  background-color: var(--white);
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-category {
  padding: 2rem;
  background-color: var(--gray-100);
  border-radius: 8px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.skill-category:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.skill-category h3 {
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--royal-blue);
}

.skill-list {
  list-style: none;
}

.skill-item {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.skill-item::before {
  content: '•';
  color: var(--gold);
  font-size: 1.5rem;
  margin-right: 0.5rem;
}

/* Contact Section */
.contact {
  background-color: var(--gray-100);
}

.contact-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.contact-icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--light-blue);
  color: var(--royal-blue);
  border-radius: 50%;
  margin-right: 1rem;
  font-size: 1.2rem;
}

.contact-details h4 {
  margin-bottom: 0.3rem;
}

.contact-form {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--box-shadow);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.form-control {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  font-family: 'Open Sans', sans-serif;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--sky-blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 150px;
}

/* Footer */
.footer {
  background-color: var(--royal-blue);
  color: var(--white);
  padding: 3rem 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-logo {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--white);
  margin-bottom: 1rem;
}

.footer-logo span {
  color: var(--gold);
}

.footer-about p {
  margin-bottom: 1.5rem;
}

.footer-links h3,
.footer-contact h3 {
  color: var(--white);
  margin-bottom: 1.5rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: var(--light-blue);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--gold);
  padding-left: 5px;
}

.footer-contact p {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.footer-contact i {
  margin-right: 0.8rem;
  color: var(--gold);
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  background-color: var(--royal-blue);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--gold);
}

/* Responsive Styles */
@media screen and (max-width: 992px) {
  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-text {
    padding-right: 0;
    margin-top: 2rem;
  }

  .hero-text h1 {
    font-size: 2.8rem;
  }

  .hero-text h2 {
    font-size: 1.5rem;
  }

  .hero-text p {
    margin: 0 auto 2rem;
  }

  .social-icons {
    justify-content: center;
  }

  .about-content {
    flex-direction: column;
  }

  .timeline::after {
    left: 31px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
  }

  .timeline-item:nth-child(even) {
    left: 0;
  }

  .timeline-item:nth-child(odd)::after,
  .timeline-item:nth-child(even)::after {
    left: 21px;
  }
}

@media screen and (max-width: 768px) {
  .nav-links {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--white);
    width: 100%;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
    padding: 2rem 0;
  }

  .nav-links.active {
    left: 0;
  }

  .nav-links li {
    margin: 1.5rem 0;
  }

  .hamburger {
    display: block;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .hero-text h1 {
    font-size: 2.5rem;
  }

  .section {
    padding: 3rem 0;
  }

  .profile-img {
    width: 250px;
    height: 250px;
  }
}

@media screen and (max-width: 576px) {
  .hero-text h1 {
    font-size: 2rem;
  }

  .hero-text h2 {
    font-size: 1.2rem;
  }

  .profile-img {
    width: 200px;
    height: 200px;
  }

  .section-title h2 {
    font-size: 1.8rem;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 1s ease forwards;
}

.delay-1 {
  animation-delay: 0.2s;
}

.delay-2 {
  animation-delay: 0.4s;
}

.delay-3 {
  animation-delay: 0.6s;
}

.delay-4 {
  animation-delay: 0.8s;
}

/* Dark Mode Styles */
.dark-mode {
  --white: #0F172A;
  --dark-blue: #E5E7EB;
  --light-blue: #1E3A8A;
  --gray-100: #1E293B;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748B;
  --gray-500: #94A3B8;
}

.dark-mode .header {
  background-color: #0F172A;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.dark-mode .hero {
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
}

.dark-mode .timeline-content,
.dark-mode .contact-form,
.dark-mode .skill-category {
  background-color: #1E293B;
}

.dark-mode .form-control {
  background-color: #334155;
  border-color: #475569;
  color: #E5E7EB;
}

.dark-mode .form-control::placeholder {
  color: #94A3B8;
}

.dark-mode .contact-icon {
  background-color: #1E3A8A;
  color: #BAE6FD;
}

.dark-mode .footer {
  background-color: #0A0F1A;
}