/* ===========================
   THEME VARIABLES
=========================== */
:root {
  --color-bg: #0F172A;
  --color-bg-alt: #1E293B;
  --color-text: #E2E8F0;
  --color-text-alt: #CBD5E1;
  --color-accent: #3B82F6;
  --color-accent-light: #60A5FA;
  --color-muted: #94A3B8;
  --color-btn-hover: #2563EB;
}

/* Automatic light theme for users who prefer light mode */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #F8FAFC;
    --color-bg-alt: #E2E8F0;
    --color-text: #0F172A;
    --color-text-alt: #334155;
    --color-accent: #3B82F6;
    --color-accent-light: #2563EB;
    --color-muted: #64748B;
    --color-btn-hover: #1E40AF;
  }
}

/* ===========================
   GLOBAL STYLES
=========================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-alt);
  line-height: 1.6;
  scroll-behavior: smooth;
  transition: all 0.3s ease;
  text-align: center;
}

a {
  text-decoration: none;
  color: var(--color-accent);
  transition: all 0.3s ease;
}

a:hover {
  color: var(--color-accent-light);
  text-decoration: underline;
}

ul {
  list-style: none;
  text-align: left;
}

/* ===========================
   HERO SECTION
=========================== */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  position: relative;
  text-align: center;
  background-color: var(--color-bg); /* fallback background color */
}


/* Overlay for readability */
.hero::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1;
}

.hero-container {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.hero-text h1 {
  font-size: 3rem;
  color: var(--color-text);
}

.hero-text h2 {
  font-size: 1.5rem;
  color: var(--color-accent-light);
}

.hero-text p {
  font-size: 1rem;
  color: var(--color-text-alt);
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1rem;
}

.btn-primary, .btn-secondary {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
}

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

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

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

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

.hero-image img {
  max-width: 250px;
  border-radius: 50%;
  border: 4px solid var(--color-accent-light);
  transition: all 0.3s ease;
}

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

/* ===========================
   NAVBAR
=========================== */
nav {
  background-color: var(--color-bg-alt);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  text-align: center;
}

nav ul {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

nav a {
  font-weight: 500;
  font-size: 1rem;
  color: var(--color-text-alt);
}

/* ===========================
   SECTIONS & CARDS
=========================== */
section {
  padding: 3rem 1rem;
  max-width: 900px;
  margin: auto;
}

section h3 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--color-text);
}

.card {
  background-color: var(--color-bg-alt);
  padding: 1.5rem 2rem;
  border-radius: 12px;
  margin-bottom: 2rem;
  box-shadow: 0 6px 12px rgba(0,0,0,0.4);
}

.card h4 {
  color: var(--color-accent-light);
  margin-bottom: 1rem;
  text-align: left;
}

.card p, .card li {
  text-align: left;
  margin-bottom: 0.5rem;
  color: var(--color-text-alt);
  line-height: 1.5;
}

.card ul {
  padding-left: 1.2rem;
  margin-top: 0.5rem;
}

/* ===========================
   PROJECT CARDS
=========================== */
.images-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.project-card {
  background-color: var(--color-bg-alt);
  padding: 1rem;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card img {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 0.5rem;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.4);
}

#achievements .card {
  background-color: var(--color-bg-alt);
  padding: 1.5rem 2rem;
  border-radius: 12px;
  margin-bottom: 2rem;
  box-shadow: 0 6px 12px rgba(0,0,0,0.4);
}

#achievements .card h4 {
  color: var(--color-accent-light);
  margin-bottom: 1rem;
  text-align: left;
}

#achievements .card ul {
  padding-left: 1.2rem;
  margin-top: 0.5rem;
}

#achievements .card li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
  text-align: left;
  color: var(--color-text-alt);
}

/* ===========================
   CONTACT LIST
=========================== */
  /* ensures all icons are aligned */
.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.contact-list i {
  color: var(--color-accent);
  font-size: 1.5rem;
  min-width: 24px;
}

/* ===========================
   FOOTER
=========================== */
footer {
  text-align: center;
  padding: 2rem;
  background-color: var(--color-bg-alt);
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ===========================
   RESPONSIVENESS
=========================== */
@media (min-width: 768px) {
  .hero-container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .hero-text {
    max-width: 500px;
  }

  .hero-image img {
    max-width: 300px;
  }

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

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.2rem; }
}