/* CSS VARIABLES & THEMES */
:root {
  --bg-color: #ffffff;
  --alt-bg: #f8f9fa;
  --text-color: #212529;
  --muted-text: #64748b;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --card-bg: #ffffff;
  --tech-tag-bg: #f1f5f9;
  --border-color: #e5e7eb;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --font-family:
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --alt-bg: #1e293b;
  --text-color: #f8fafc;
  --muted-text: #94a3b8;
  --accent-color: #38bdf8;
  --accent-hover: #0284c7;
  --card-bg: #1e293b;
  --tech-tag-bg: #334155;
  --border-color: #334155;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

/* BASE & RESET RULES */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  line-height: 1.6;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.section-title {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
}

/* SCROLL REVEAL ANIMATIONS */
.section {
  padding: 6rem 0;
  min-height: 50vh;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s ease-out;
  will-change: opacity, transform;
}

.hero-section {
  opacity: 1;
  transform: translateY(0);
  background-color: var(--alt-bg);
}

.section.reveal {
  opacity: 1;
  transform: translateY(0);
}

/* NAVIGATION BAR */
header {
  position: sticky;
  top: 0;
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent-color);
  text-decoration: none;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.back-home-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.back-home-link:hover {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  position: relative;
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-color);
}

.nav-links a.active {
  font-weight: 700;
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-color);
  border-radius: 2px;
}

/* THEME TOGGLE */
.theme-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  border-radius: 4px;
}

.theme-btn i {
  font-size: 1.4rem;
  transition: transform 0.3s ease;
}

.theme-btn:hover i {
  transform: rotate(15deg);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  transition:
    background-color 0.2s ease,
    opacity 0.2s ease,
    transform 0.2s ease;
  cursor: pointer;
  border: none;
}

.primary-btn {
  background-color: var(--accent-color);
  color: #ffffff;
}

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

.secondary-btn {
  border: 1px solid var(--border-color);
  color: var(--text-color);
  background-color: transparent;
}

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

/* HERO SECTION */
.hero-section {
  min-height: calc(100dvh - 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
}

.hero-container {
  max-width: 1100px;
  display: flex;
  align-items: center;
  gap: 3rem;
}

.hero-text h1 {
  font-size: 2.75rem;
  margin-bottom: 0.5rem;
}

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

.hero-text h2 {
  font-size: 1.5rem;
  color: var(--muted-text);
  margin-bottom: 1rem;
}

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

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

.hero-image img {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent-color);
}

/* ABOUT ME SECTION */
.about-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.about-illustration {
  margin: 1.5rem auto 2.5rem auto;
  width: 100%;
  max-width: 600px;
  display: flex;
  justify-content: center;
}

.vector-pair {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin: 0 auto;
}

.vector-pair img {
  width: 100%;
  height: auto;
  flex: 1 1 0;
  max-width: 280px;
  display: block;
}

/* VECTOR IMAGE TOGGLES */
.about-illustration .vector-light {
  display: flex;
}

.about-illustration .vector-dark {
  display: none;
}

[data-theme="dark"] .about-illustration .vector-light {
  display: none;
}

[data-theme="dark"] .about-illustration .vector-dark {
  display: flex;
}

.about-text {
  font-size: 1.125rem;
  text-align: left;
  line-height: 1.8;
  color: var(--text-color);
  max-width: 650px;
  margin: 0 auto 1rem auto;
}

/* SKILLS SECTION */
.filter-buttons {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-color);
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.2s ease;
}

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

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  align-items: stretch;
}

.skill-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 1.5rem 1.25rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: 180px;
  transition:
    background-color 0.4s ease,
    border-color 0.4s ease,
    box-shadow 0.4s ease,
    transform 0.2s ease;
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-color);
}

.skill-icon {
  font-size: 2.5rem;
  color: var(--accent-color);
  margin-bottom: 0.75rem;
}

.skill-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

.skill-desc {
  font-size: 0.875rem;
  color: var(--muted-text);
  line-height: 1.4;
}

.skill-card.hide {
  display: none;
}

/* PROJECTS SECTION */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.project-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.project-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
}

.tech-tags li {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  background-color: var(--tech-tag-bg);
  color: var(--text-color);
  border-radius: 4px;
  font-weight: 500;
}

.project-content h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  color: var(--text-color);
}

.project-content p {
  color: var(--muted-text);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

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

.project-links a {
  text-decoration: none;
  flex: 1;
  color: var(--accent-color);
}

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

/* SEE MORE BUTTON AND PAGE */
.see-more-container {
  text-align: center;
  margin-top: 2.5rem;
}

.see-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-color);
  color: #ffffff;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition:
    background-color 0.2s ease,
    transform 0.2s ease;
}

.see-more-btn:hover {
  background-color: var(--accent-hover);
}

.projects-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.projects-header {
  text-align: center;
  margin-bottom: 3rem;
}

/* TEMPORARY Under Construction Card styling */
.under-construction-card {
  max-width: 600px;
  margin: 2rem auto;
  padding: 3rem 2rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow);
  text-align: center;
}

.construction-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 1.5rem auto;
  border-radius: 50%;
  background-color: var(--alt-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.construction-icon i {
  font-size: 2.25rem;
  color: var(--accent-color);
}

.under-construction-card h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-color);
}

.under-construction-card p {
  color: var(--muted-text);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

/* CONTACT FORM SECTION & SOCIAL LINKS */
.contact-container {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-form {
  margin-top: 2rem;
  text-align: left;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--text-color);
  font-family: inherit;
  transition: border-color 0.2s ease;
}

.form-group input:focus-visible,
.form-group textarea:focus-visible {
  outline: 2px solid var(--accent-color);
  border-color: transparent;
}

.error-message {
  color: #ef4444;
  font-size: 0.8rem;
  display: block;
  margin-top: 0.25rem;
}

.form-feedback {
  margin-top: 1rem;
  text-align: center;
  font-weight: 600;
}

.contact-form button[type="submit"] {
  display: block;
  margin: 1.5rem auto 0 auto;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.25rem;
  margin-top: 2rem;
  width: 100%;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.social-link i {
  font-size: 1.4rem;
}

.social-link:hover {
  color: var(--accent-hover);
}

/* FOOTER SECTION */
footer {
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  width: 100%;
  padding: 2rem 1rem 2.5rem 1rem;
  text-align: center;
}

footer p {
  display: block;
  line-height: 1.6;
  max-width: 90%;
  margin: 0 auto;
}

.heart-icon {
  color: var(--accent-color);
  transition: transform 0.2s ease;
  vertical-align: -0.15em;
  display: inline-block;
}

.heart-icon:hover {
  transform: scale(1.2);
}

/* MEDIA QUERIES & RESPONSIVENESS */
@media (max-width: 768px) {
  .section {
    padding: 4rem 0;
  }

  .hero-container {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-cta {
    justify-content: center;
  }

  .nav-toggle {
    display: block;
  }

  .hamburger,
  .hamburger::before,
  .hamburger::after {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    position: relative;
    transition: transform 0.2s ease;
  }

  .hamburger::before,
  .hamburger::after {
    content: "";
    position: absolute;
  }

  .hamburger::before {
    top: -8px;
  }

  .hamburger::after {
    top: 8px;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .about-illustration {
    margin: 1rem 0 2rem 0;
    max-width: 450px;
  }

  .vector-pair {
    gap: 1rem;
  }

  .about-text {
    font-size: 1rem;
    line-height: 1.7;
  }
}

@media (max-width: 480px) {
  .contact-form button[type="submit"],
  .see-more-btn {
    width: 100%;
  }

  .see-more-btn {
    justify-content: center;
  }

  .vector-pair {
    flex-direction: column;
    gap: 0.75rem;
  }

  .vector-pair img {
    max-width: 180px;
  }
}