/* CORRECTED CSS - NO TRANSPARENCY, NO OVERLAP, HERO HIDING SUPPORT */

:root {
  /* Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;

  /* Semantic Colors */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);

  /* Typography */
  --font-family-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;

  /* Spacing */
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-base: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Background gradients */
  --color-bg-1: rgba(59, 130, 246, 0.08);
  --color-bg-8: rgba(6, 182, 212, 0.08);
}

/* Base Styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  scroll-behavior: smooth;
  box-sizing: border-box;
}

/* CRITICAL FIX: Body with padding for fixed header */
body {
  margin: 0;
  padding: 0;
  padding-top: 80px; /* Prevent content overlap with fixed header */
}

*, *::before, *::after {
  box-sizing: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  margin: 0 0 var(--space-16) 0;
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
}

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

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

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

/* CRITICAL FIX: Header with ZERO transparency */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-surface) !important;
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--duration-normal) var(--ease-standard);
  opacity: 1 !important;
}

/* CRITICAL FIX: Scrolled header with FULL OPACITY */
.header.scrolled {
  box-shadow: var(--shadow-md);
  background-color: var(--color-surface) !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  opacity: 1 !important;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-16) 0;
}

.nav__brand h3 {
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
}

.nav__menu {
  display: flex;
  gap: var(--space-32);
}

.nav__link {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  transition: color var(--duration-fast) var(--ease-standard);
  position: relative;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--duration-normal) var(--ease-standard);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* HERO SECTION: Fixed spacing and hero content support */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-bg-1), var(--color-bg-8));
  position: relative;
  overflow: hidden;
  margin-top: -80px; /* Compensate for body padding */
  padding-top: 80px; /* Ensure content is below header */
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg,
    rgba(var(--color-teal-500-rgb), 0.1) 0%,
    rgba(var(--color-slate-900-rgb), 0.05) 100%);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.hero__title {
  font-size: clamp(var(--font-size-4xl), 8vw, 72px);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-16);
  animation: fadeInUp 1s var(--ease-standard);
}

.hero__subtitle {
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-16);
  font-weight: var(--font-weight-medium);
  animation: fadeInUp 1s var(--ease-standard) 0.2s both;
}

.hero__tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-32);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 1s var(--ease-standard) 0.4s both;
}

.hero__actions {
  display: flex;
  gap: var(--space-16);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s var(--ease-standard) 0.6s both;
}

/* Sections */
section {
  padding: var(--space-32) 0;
}

section:first-of-type {
  padding-top: calc(var(--space-32) + 20px);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-32);
}

.section__title {
  font-size: var(--font-size-3xl);
  color: var(--color-text);
  margin-bottom: var(--space-16);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

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

.about__content {
  max-width: 800px;
  margin: 0 auto;
}

.about__text p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  margin-bottom: var(--space-20);
}

.about__details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-24);
  margin-top: var(--space-32);
}

.about__detail h4 {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-8);
}

.about__detail p {
  color: var(--color-text-secondary);
}

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

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-24);
  margin-bottom: var(--space-32);
}

.skill-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  border: 1px solid var(--color-card-border);
  transition: all var(--duration-normal) var(--ease-standard);
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.skill-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-16);
}

.skill-card__header h3 {
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.skill-card__level {
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

.skill-card__bar {
  width: 100%;
  height: 8px;
  background-color: var(--color-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-12);
}

.skill-card__progress {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  border-radius: var(--radius-full);
  transition: width 1s var(--ease-standard);
  width: 0;
}

.skill-card.animate .skill-card__progress {
  animation: fillProgress 1.5s var(--ease-standard) forwards;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: var(--color-btn-primary-text);
  padding: var(--space-12) var(--space-24);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
}

/* Projects Section */
.projects {
  background-color: var(--color-surface);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-24);
}

.project-card {
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-standard);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.project-card__content {
  padding: var(--space-24);
}

.project-card__title {
  color: var(--color-text);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-16);
}

.project-card__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-20);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-bottom: var(--space-20);
}

.tech-tag {
  background-color: var(--color-secondary);
  color: var(--color-text);
  font-size: 12px;
  font-weight: var(--font-weight-medium);
  padding: 4px var(--space-12);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.project-card__highlights ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.project-card__highlights li {
  color: var(--color-text-secondary);
  font-size: 12px;
  padding: 4px 0;
  position: relative;
  padding-left: var(--space-20);
}

.project-card__highlights li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

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

.contact__content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-32);
  max-width: 1000px;
  margin: 0 auto;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
}

.contact__item h4 {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-8);
}

.contact__item p,
.contact__item a {
  color: var(--color-text-secondary);
}

.contact__form {
  background-color: var(--color-surface);
  padding: var(--space-24);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
}

/* Form Elements */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: 2px solid var(--color-primary);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: 12px;
}

.form-group {
  margin-bottom: var(--space-16);
}

/* Container */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-16);
  max-width: 1280px;
}

/* Footer */
.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-24) 0;
  text-align: center;
}

.footer p {
  color: var(--color-text-secondary);
  font-size: 12px;
  margin: 0;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fillProgress {
  from {
    width: 0;
  }
  to {
    width: var(--progress-width, 0%);
  }
}

/* Mobile Navigation */
.nav__toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: var(--space-8);
}

.nav__toggle span {
  width: 24px;
  height: 3px;
  background-color: var(--color-text);
  margin: 2px 0;
  transition: all var(--duration-normal) var(--ease-standard);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-surface) !important;
    flex-direction: column;
    padding: var(--space-24);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-standard);
  }

  .nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__toggle {
    display: flex;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .hero__actions .btn {
    width: 100%;
    max-width: 300px;
  }

  .skills__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }

  .contact__content {
    grid-template-columns: 1fr;
    gap: var(--space-24);
  }

  .about__details {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: var(--space-16);
  }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-xl);
  }

  section {
    padding: var(--space-24) 0;
  }

  .project-card__content,
  .contact__form {
    padding: var(--space-16);
  }
}