/* 
 * Main Stylesheet for Product Manager Portfolio Website
 * Author: Manus AI
 * Version: 1.0
 * Updated: Color scheme modified to replace black with soft charcoal
 */

/* ======================================
   Table of Contents:
   1. Variables & Root
   2. Base Styles
   3. Typography
   4. Layout & Grid
   5. Header & Navigation
   6. Hero Section
   7. Value Proposition
   8. Featured Projects
   9. Skills Section
   10. Testimonials
   11. Blog Section
   12. CTA Section
   13. Footer
   14. Buttons & Forms
   15. Animations
   16. Utilities
   17. Dark Mode
   18. Media Queries
   ====================================== */

/* ======================================
   1. Variables & Root
   ====================================== */
:root {
  /* Colors */
  --color-primary: #0A2463;
  --color-secondary: #1D7D81;
  --color-accent: #4ECDC4;
  --color-dark: #4A4A4A; /* Changed from #333333 to soft charcoal */
  --color-gray: #6c757d;
  --color-light-gray: #f8f9fa;
  --color-white: #FFFFFF;
  
  /* Typography */
  --font-primary: 'Montserrat', sans-serif;
  --font-secondary: 'Lato', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Container Width */
  --container-max-width: 1200px;
  --container-padding: 1.5rem;
}

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

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

body {
  font-family: var(--font-secondary);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-white);
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

/* ======================================
   3. Typography
   ====================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
}

.highlight {
  color: var(--color-secondary);
}

.section-title {
  position: relative;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-gray);
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
}

/* ======================================
   4. Layout & Grid
   ====================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

.bg-light {
  background-color: var(--color-light-gray);
}

.bg-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.bg-primary h2, 
.bg-primary h3, 
.bg-primary h4 {
  color: var(--color-white);
}

.section-header {
  margin-bottom: var(--spacing-lg);
}

/* ======================================
   5. Header & Navigation
   ====================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.header.scrolled {
  padding: 0.5rem 0;
  box-shadow: var(--shadow-md);
}

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

.logo a {
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-primary);
  text-decoration: none;
}

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

.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: 1.5rem;
}

.nav-list a {
  font-family: var(--font-primary);
  font-weight: 500;
  color: var(--color-dark);
  position: relative;
  padding: 0.5rem 0;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-secondary);
}

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

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

.nav-cta {
  background-color: var(--color-secondary);
  color: var(--color-white) !important;
  padding: 0.5rem 1rem !important;
  border-radius: var(--border-radius-sm);
  transition: background-color var(--transition-fast);
}

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

.nav-cta::after {
  display: none;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--color-dark);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

.theme-toggle {
  margin-left: var(--spacing-md);
}

#theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--color-dark);
  transition: color var(--transition-fast);
}

#theme-toggle-btn:hover {
  color: var(--color-secondary);
}

#theme-toggle-btn .fa-sun {
  display: none;
}

/* ======================================
   6. Hero Section
   ====================================== */
.hero {
  position: relative;
  padding: 8rem 0 5rem;
  overflow: hidden;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.hero-text {
  flex: 1;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.animated-headline {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-gray);
  margin-bottom: var(--spacing-lg);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
}

.hero-bg-shape {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background-color: var(--color-light-gray);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
  z-index: -1;
}

/* ======================================
   7. Value Proposition
   ====================================== */
.value-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.value-card {
  background-color: var(--color-white);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.value-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.value-icon {
  font-size: 2.5rem;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

.value-card h3 {
  margin-bottom: var(--spacing-sm);
}

.value-card p {
  color: var(--color-gray);
  margin-bottom: 0;
}

/* ======================================
   8. Featured Projects
   ====================================== */
.project-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.project-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.project-image {
  height: 200px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-content {
  padding: var(--spacing-md);
}

.project-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: var(--spacing-sm);
}

.tag {
  background-color: var(--color-light-gray);
  color: var(--color-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
}

.project-content h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.project-content p {
  color: var(--color-gray);
  margin-bottom: var(--spacing-sm);
}

.section-cta {
  text-align: center;
  margin-top: var(--spacing-md);
}

/* ======================================
   9. Skills Section
   ====================================== */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.skill-category h3 {
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.skill-bars {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.skill-bar {
  width: 100%;
}

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

.skill-progress {
  height: 8px;
  background-color: var(--color-light-gray);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
}

.skill-progress-bar {
  height: 100%;
  background-color: var(--color-secondary);
  border-radius: var(--border-radius-sm);
  width: 0;
  transition: width 1.5s ease;
}

/* ======================================
   10. Testimonials
   ====================================== */
.testimonial-slider {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.testimonial-slide {
  display: none;
  animation: fadeIn 0.5s ease forwards;
}

.testimonial-slide.active {
  display: block;
}

.testimonial-content {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.testimonial-quote {
  position: relative;
  padding-left: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.testimonial-quote i {
  position: absolute;
  top: 0;
  left: 0;
  font-size: 1.5rem;
  color: var(--color-secondary);
  opacity: 0.5;
}

.testimonial-quote p {
  font-style: italic;
  margin-bottom: 0;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.testimonial-author-image {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  overflow: hidden;
}

.testimonial-author-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.testimonial-author-info h4 {
  margin-bottom: 0.25rem;
}

.testimonial-author-info p {
  color: var(--color-gray);
  margin-bottom: 0;
  font-size: 0.875rem;
}

.testimonial-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: var(--spacing-md);
  gap: var(--spacing-sm);
}

.testimonial-prev,
.testimonial-next {
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--color-primary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.testimonial-prev:hover,
.testimonial-next:hover {
  color: var(--color-secondary);
}

.testimonial-dots {
  display: flex;
  gap: 0.5rem;
}

.testimonial-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-light-gray);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.testimonial-dot.active,
.testimonial-dot:hover {
  background-color: var(--color-secondary);
}

/* ======================================
   11. Blog Section
   ====================================== */
.blog-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.blog-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.blog-image {
  height: 200px;
  overflow: hidden;
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.blog-card:hover .blog-image img {
  transform: scale(1.05);
}

.blog-content {
  padding: var(--spacing-md);
}

.blog-date {
  font-size: 0.875rem;
  color: var(--color-gray);
  margin-bottom: var(--spacing-sm);
}

.blog-content h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.blog-content p {
  color: var(--color-gray);
  margin-bottom: var(--spacing-sm);
}

/* ======================================
   12. CTA Section
   ====================================== */
.cta-section {
  position: relative;
  overflow: hidden;
}

.cta-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-md);
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

/* ======================================
   13. Footer
   ====================================== */
.footer {
  background-color: var(--color-dark); /* Changed from dark to soft charcoal */
  color: var(--color-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-logo a {
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-white);
  text-decoration: none;
}

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

.footer-logo p {
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--spacing-sm);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.footer-links-column h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-links-column ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links-column a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.footer-links-column a:hover {
  color: var(--color-accent);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-bottom: var(--spacing-sm);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.social-links a:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  margin-bottom: 0;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-bottom-links a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom-links a:hover {
  color: var(--color-accent);
}

/* ======================================
   14. Buttons & Forms
   ====================================== */
.btn {
  display: inline-block;
  font-family: var(--font-primary);
  font-weight: 600;
  text-align: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

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

.btn-secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-light {
  background-color: var(--color-white);
  color: var(--color-primary);
}

.btn-light:hover {
  background-color: var(--color-light-gray);
}

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

.btn-outline-light:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

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

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

.btn-text {
  background: none;
  padding: 0;
  color: var(--color-secondary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.btn-text i {
  transition: transform var(--transition-fast);
}

.btn-text:hover i {
  transform: translateX(5px);
}

/* ======================================
   15. Animations
   ====================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ======================================
   16. Utilities
   ====================================== */
#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 40px;
  height: 40px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 999;
}

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

#back-to-top:hover {
  background-color: var(--color-primary);
}

/* ======================================
   17. Dark Mode
   ====================================== */
body.dark-mode {
  --color-dark: #f8f9fa;
  --color-white: #555555; /* Changed from #121212 to a softer dark gray */
  --color-light-gray: #666666; /* Changed from #1e1e1e to a medium gray */
  --color-gray: #adb5bd;
  
  background-color: var(--color-white);
  color: var(--color-dark);
}

body.dark-mode .header,
body.dark-mode .value-card,
body.dark-mode .project-card,
body.dark-mode .blog-card,
body.dark-mode .testimonial-content {
  background-color: #666666; /* Changed from #1e1e1e to match the new dark mode theme */
  box-shadow: var(--shadow-md);
}

body.dark-mode .tag {
  background-color: #777777; /* Changed from #2a2a2a to a lighter gray */
}

body.dark-mode .footer {
  background-color: #444444; /* Changed from #0a0a0a to a softer dark gray */
}

body.dark-mode #theme-toggle-btn .fa-moon {
  display: none;
}

body.dark-mode #theme-toggle-btn .fa-sun {
  display: inline-block;
  color: #ffc107;
}

/* ======================================
   18. Media Queries
   ====================================== */
@media (max-width: 1024px) {
  html {
    font-size: 15px;
  }
  
  .hero-content {
    flex-direction: column;
  }
  
  .hero-text,
  .hero-image {
    flex: none;
    width: 100%;
  }
  
  .hero-image {
    justify-content: center;
    margin-top: var(--spacing-lg);
  }
  
  .animated-headline {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .section-padding {
    padding: var(--spacing-lg) 0;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-list {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
  }
  
  .nav-list.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    grid-template-columns: 1fr 1fr;
  }
  
  .animated-headline {
    font-size: 2rem;
  }
  
  .hero {
    padding: 7rem 0 3rem;
  }
  
  .hero-bg-shape {
    display: none;
  }
}

@media (max-width: 576px) {
  html {
    font-size: 14px;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .footer-bottom-links {
    justify-content: center;
  }
  
  .animated-headline {
    font-size: 1.75rem;
  }
}