:root {
  --primary: #2D3748;               /* Deep Blue-Gray for headings */
  --secondary: #4A5568;             /* Muted Gray-Blue for subtext */
  --accent: hsl(189, 20%, 46%);     /* Teal accent */
  --background: #F7FAFC;            /* Soft light background */
  --card-bg: rgba(255, 255, 255, 0.92); /* Glassy light card */
  --shadow: rgba(0, 32, 51, 0.08);  /* Soft, cool shadow */
  --text: #223046;                  /* Dark text */
}

[data-theme="dark"] {
  --primary: #E2E8F0;               /* Light Gray-Blue for headings */
  --secondary: #A0AEC0;             /* Muted Gray for subtext */
  --accent: hsl(189, 40%, 62%);     /* Brighter teal for dark mode */
  --background: #1A202C;            /* Deep navy */
  --card-bg: rgba(26, 32, 44, 0.92);/* Glassy dark card */
  --shadow: rgba(0, 0, 0, 0.32);    /* Deeper shadow */
  --text: #E2E8F0;                  /* Light text */
}

/* Global reset and transitions */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

html, body {
  height: 100%;
}

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility helpers */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  padding: 8px 12px;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  z-index: 1100;
}

/* Subtle film grain */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.03;
  z-index: 1;
}

/* Layout container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 2;
}

/* Header */
header {
  padding: 16px 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--background) 80%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--text) 10%, transparent);
}

@supports not (background: color-mix(in srgb, #fff 80%, transparent)) {
  header {
    background: var(--card-bg);
    border-bottom: 1px solid rgba(0,0,0,0.06);
  }
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.logo-img {
  width: auto;
  height: 2.25rem;
  display: block;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.975rem;
  letter-spacing: 0.2px;
  padding: 6px 0;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s ease;
}

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

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

.theme-toggle {
  background: none;
  border: 1px solid color-mix(in srgb, var(--text) 20%, transparent);
  color: var(--text);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 8px 10px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* Hero */
.hero {
  min-height: calc(100vh - 80px);
  padding-top: 100px; /* space below fixed header */
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 720px;
}

.hero h1 {
  font-size: clamp(2rem, 3.5vw + 1rem, 3.25rem);
  margin-bottom: 18px;
  line-height: 1.2;
  color: var(--primary);
}

.hero p {
  font-size: 1.125rem;
  margin-bottom: 28px;
  color: var(--secondary);
  min-height: 1.6em; /* keeps layout stable for typed text */
}

.cta-button {
  display: inline-block;
  padding: 14px 26px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 30%, transparent);
}

.cta-button:hover,
.cta-button:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 10px 26px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* Sections */
.section-title {
  font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  margin-bottom: 48px;
  text-align: center;
  color: var(--primary);
}

.about {
  padding: 96px 0;
}

.about-text {
  max-width: 900px;
  margin: 0 auto 24px auto;
  font-size: 1.05rem;
  color: var(--text);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  margin-top: 28px;
}

.about-card {
  background: var(--card-bg);
  padding: 28px;
  border-radius: 20px;
  box-shadow:
    8px 8px 15px var(--shadow),
    -8px -8px 15px rgba(255, 255, 255, 0.08);
}

.about-card i {
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 14px;
  display: inline-block;
}

.about-card h3 {
  margin-bottom: 8px;
  color: var(--primary);
  font-size: 1.25rem;
}

.about-card p {
  color: var(--secondary);
}

/* Skills */
.skills {
  padding: 96px 0;
  background: linear-gradient(45deg, var(--background), var(--card-bg));
}

.skill-bars {
  display: grid;
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.skill-bar {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 15px;
  box-shadow: 5px 5px 10px var(--shadow);
}

.skill-bar h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.05rem;
}

.skill-progress {
  height: 10px;
  background: color-mix(in srgb, var(--text) 8%, transparent);
  border-radius: 6px;
  position: relative;
  overflow: hidden;
}

.skill-progress::after {
  content: '';
  position: absolute;
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 6px;
  animation: progressAnimation 1.5s ease-out forwards;
}

@keyframes progressAnimation {
  from { width: 0; }
  to { width: var(--progress); }
}

/* Portfolio */
.portfolio {
  padding: 96px 0;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.portfolio-item {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  cursor: pointer;
  background: #000;
}

.portfolio-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.3s ease, opacity 0.3s ease;
  display: block;
}

.portfolio-item:hover img,
.portfolio-item:focus-within img {
  transform: scale(1.05);
  opacity: 0.9;
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.60);
  color: #fff !important;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  text-align: center;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.portfolio-overlay h3,
.portfolio-overlay p {
  color: #fff !important;
}

.portfolio-item:hover .portfolio-overlay,
.portfolio-item:focus-within .portfolio-overlay {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-overlay a {
  color: #FFD700; /* gold */
  font-weight: 700;
  text-decoration: underline;
  text-shadow: 0 0 5px #000;
  transition: color 0.25s ease;
}

.portfolio-overlay a:hover,
.portfolio-overlay a:focus-visible {
  color: #FF8C00; /* deep orange */
}

/* Contact */
.contact {
  padding: 96px 0;
  background: var(--card-bg);
}

.contact-form {
  max-width: 640px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--text) 12%, transparent);
  background: var(--background);
  border-radius: 10px;
  color: var(--text);
  font-size: 1rem;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: color-mix(in srgb, var(--text) 50%, transparent);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

.submit-btn {
  background: var(--accent);
  color: #fff;
  padding: 14px 26px;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.3px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 35%, transparent);
}

.submit-btn:hover,
.submit-btn:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 45%, transparent);
}

/* Footer */
footer {
  padding: 56px 0;
  text-align: center;
  background: var(--background);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
}

.social-links a {
  color: var(--text);
  font-size: 1.5rem;
  transition: color 0.25s ease, transform 0.25s ease;
}

.social-links a:hover,
.social-links a:focus-visible {
  color: var(--accent);
  transform: translateY(-2px);
}

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

.animate-fade-in {
  animation: fadeIn 0.9s ease-out forwards;
}

/* Responsive */
@media (max-width: 992px) {
  .nav-links {
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .hero {
    padding-top: 96px;
  }

  .hero h1 {
    font-size: clamp(1.75rem, 5vw + 1rem, 2.5rem);
  }

  .nav-links {
    display: none; /* simple mobile treatment; consider a menu toggle later */
  }

  .section-title {
    font-size: clamp(1.5rem, 3.5vw + 1rem, 2rem);
  }

  .portfolio-item img {
    height: 220px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}