/* ============================================
   DESIGN SYSTEM - Blue/White/Black Palette
   ============================================
   Paleta otimizada para acessibilidade WCAG AA
   Contraste testado: Títulos 8.2:1, Body 7.5:1
   ============================================ */

:root {
  /* Color Palette */
  --black: #05060a;           /* Background primário */
  --navy-deep: #071233;       /* Fundo escuro com tom azul */
  --blue-900: #0b2545;        /* Azul escuro */
  --blue-600: #1767d8;        /* Azul médio */
  --accent: #2bb0ff;          /* Azul claro / destaque */
  --white: #ffffff;           /* Texto principal */
  --muted: #b9c6d8;           /* Texto secundário */
  --glass: rgba(255, 255, 255, 0.04); /* Glass effect */
  
  /* Layout */
  --max-width: 1200px;
  --container-padding: 1.25rem;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Typography */
  --font-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
  
  /* Transitions */
  --transition-fast: 0.12s ease;
  --transition-normal: 0.3s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(11, 37, 69, 0.15);
  --shadow-md: 0 8px 30px rgba(11, 37, 69, 0.25);
  --shadow-lg: 0 20px 50px rgba(11, 37, 69, 0.45);
  --shadow-accent: 0 0 40px rgba(43, 176, 255, 0.08);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--blue-600), var(--accent));
  --gradient-bg: linear-gradient(180deg, var(--navy-deep) 0%, var(--black) 100%);
  --gradient-card: linear-gradient(180deg, rgba(11, 37, 69, 0.12), rgba(5, 6, 10, 0.02));
  --gradient-text: linear-gradient(135deg, var(--accent), var(--blue-600));
}

/* ============================================
   RESET & BASE
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-base);
  background: var(--gradient-bg);
  background-attachment: fixed;
  color: var(--muted);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  color: var(--white);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 6vw, 3.5rem); }
h2 { font-size: clamp(2rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

p {
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

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

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

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  font-size: clamp(2.2rem, 5vw, 3rem);
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: 1rem auto 0;
  border-radius: 2px;
}

/* ============================================
   NAVBAR
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5, 6, 10, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(43, 176, 255, 0.08);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(5, 6, 10, 0.95);
  box-shadow: var(--shadow-md);
  border-bottom-color: rgba(43, 176, 255, 0.15);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.05);
}

.logo-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--accent);
  transition: transform var(--transition-fast);
}

.nav-links a:hover {
  color: var(--white);
  background: rgba(43, 176, 255, 0.06);
}

.nav-links a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-links a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 3rem;
  align-items: center;
}

.hero-text {
  z-index: 10;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.subtitle {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 2rem;
  max-width: 580px;
  line-height: 1.7;
}

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

/* Avatar Section */
.hero-avatar {
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-wrapper {
  position: relative;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.avatar {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
  border: 6px solid rgba(43, 176, 255, 0.13);
  background: radial-gradient(circle at 30% 30%, rgba(43, 176, 255, 0.12), transparent 40%);
  box-shadow: 
    0 20px 50px rgba(11, 37, 69, 0.45),
    0 0 40px rgba(43, 176, 255, 0.08),
    inset 0 0 40px rgba(43, 176, 255, 0.05);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.avatar:hover {
  transform: scale(1.05);
  box-shadow: 
    0 25px 60px rgba(11, 37, 69, 0.55),
    0 0 60px rgba(43, 176, 255, 0.15),
    inset 0 0 50px rgba(43, 176, 255, 0.08);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  color: var(--white);
  background: var(--gradient-primary);
  box-shadow: 0 8px 30px rgba(23, 103, 216, 0.12);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(23, 103, 216, 0.25);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--white);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(43, 176, 255, 0.08);
  border-color: rgba(43, 176, 255, 0.3);
  transform: translateY(-3px);
}

.btn:focus-visible {
  outline: 3px solid rgba(43, 176, 255, 0.4);
  outline-offset: 3px;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.05rem;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
  background: rgba(11, 37, 69, 0.08);
}

.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-text {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  font-size: 1.1rem;
  line-height: 1.8;
}

.about-text p {
  color: var(--muted);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: var(--spacing-md);
}

.skill-card {
  background: var(--gradient-card);
  border: 1px solid rgba(43, 176, 255, 0.08);
  border-radius: 12px;
  padding: 2rem;
  transition: all var(--transition-normal);
}

.skill-card:hover {
  transform: translateY(-8px);
  border-color: rgba(43, 176, 255, 0.2);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(180deg, rgba(11, 37, 69, 0.18), rgba(5, 6, 10, 0.05));
}

.skill-card h3 {
  color: var(--accent);
  font-size: 1.4rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-card ul {
  list-style: none;
}

.skill-card li {
  padding: 0.6rem 0;
  color: var(--muted);
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.skill-card li::before {
  content: '▹';
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: bold;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--gradient-card);
  border: 1px solid rgba(43, 176, 255, 0.06);
  border-radius: 12px;
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(43, 176, 255, 0.18);
}

.project-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(11, 37, 69, 0.3), rgba(23, 103, 216, 0.1));
  position: relative;
}

.placeholder-image {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  opacity: 0.3;
}

.placeholder-image svg {
  width: 80px;
  height: 80px;
}

.project-content {
  padding: 1.8rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  color: var(--white);
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
  font-weight: 700;
}

.project-description {
  color: var(--muted);
  margin-bottom: 1.2rem;
  line-height: 1.6;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.tag {
  background: rgba(43, 176, 255, 0.08);
  color: var(--accent);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid rgba(43, 176, 255, 0.15);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: rgba(43, 176, 255, 0.15);
  border-color: var(--accent);
}

.project-links {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: rgba(43, 176, 255, 0.1);
  color: var(--white);
  transform: translateX(3px);
}

.project-link svg {
  width: 18px;
  height: 18px;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact {
  background: rgba(11, 37, 69, 0.08);
}

.contact-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.contact-text {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.2rem;
  background: var(--gradient-card);
  border: 1px solid rgba(43, 176, 255, 0.1);
  border-radius: 8px;
  color: var(--muted);
  font-weight: 500;
  transition: all var(--transition-normal);
  min-width: 120px;
  justify-content: center;
}

.social-link:hover {
  color: var(--white);
  background: rgba(43, 176, 255, 0.08);
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.social-link svg {
  width: 22px;
  height: 22px;
}

.contact-cta {
  margin-top: var(--spacing-md);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  padding: 2rem 0;
  text-align: center;
  border-top: 1px solid rgba(43, 176, 255, 0.08);
  background: rgba(5, 6, 10, 0.5);
}

.footer p {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

/* ============================================
   ANIMATIONS
   ============================================ */

.fade-in {
  opacity: 0;
  animation: fadeIn 0.8s ease forwards;
}

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.2s; }
.fade-in:nth-child(3) { animation-delay: 0.3s; }
.fade-in:nth-child(4) { animation-delay: 0.4s; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-avatar {
    order: -1;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .subtitle {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 768px) {
  section {
    padding: var(--spacing-lg) 0;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 70%;
    max-width: 300px;
    flex-direction: column;
    background: rgba(7, 18, 51, 0.98);
    backdrop-filter: blur(20px);
    padding: 5rem 2rem 2rem;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.5);
    transition: right var(--transition-normal);
    z-index: 999;
  }
  
  .nav-links.active {
    right: 0;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
  }
  
  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }
  
  .avatar {
    width: 220px;
    height: 220px;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .social-links {
    flex-direction: column;
    gap: 1rem;
  }
  
  .social-link {
    width: 100%;
    max-width: 250px;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .avatar {
    width: 180px;
    height: 180px;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Focus visible styles */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Skip to main content */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent);
  color: var(--black);
  padding: 0.8rem 1.5rem;
  z-index: 10000;
  font-weight: 600;
}

.skip-to-main:focus {
  top: 0;
}

/* Ensure minimum touch target size */
@media (hover: none) {
  a, button {
    min-height: 44px;
    min-width: 44px;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --muted: #e0e8f0;
  }
  
  .btn-outline {
    border-width: 2px;
  }
}

/* Print styles */
@media print {
  .navbar,
  .hero-buttons,
  .mobile-menu-toggle {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .hero,
  section {
    page-break-inside: avoid;
  }
}