/* ==========================================================
   SUMÁRIO
   ========================================================== 
   1. Reset e Configurações Base
   2. Variáveis CSS (Design Tokens)
   3. Tipografia
   4. Animações
   5. Layout Principal
      5.1. Header e Logo
      5.2. Navegação Desktop
      5.3. Menu Mobile
   6. Seções
      6.1. Hero
      6.2. About
      6.3. Projects
      6.4. Contact
      6.5. Footer
   7. Componentes
      7.1. Botões
      7.2. Stats Cards
   8. Utilitários
   9. Responsividade
   ========================================================== */

/* ==========================================================
   1. RESET E CONFIGURAÇÕES BASE
   ========================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  background: var(--primary-color);
  color: var(--text-color);
  padding-top: var(--header-height);
  line-height: 1.6;
}

/* ==========================================================
   2. VARIÁVEIS CSS (DESIGN TOKENS)
   ========================================================== */

:root {
  /* Cores Principais */
  --primary-color: #4a4a4a;
  --primary-dark: #727171;
  --accent-color: #fbbf24;
  --accent-hover: #f59e0b;

  /* Cores de Texto */
  --text-color: #1f2937;
  --text-light: #6b7280;
  --text-white: #ffffff;

  /* Cores de Background */
  --bg-white: #ffffff;
  --bg-gray-light: #f9fafb;
  --bg-gray: #f3f4f6;
  --bg-gray-dark: #e5e7eb;

  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Espaçamentos */
  --space-xs: 5px;
  --space-sm: 10px;
  --space-md: 15px;
  --space-lg: 20px;
  --space-xl: 30px;
  --space-2xl: 40px;
  --space-3xl: 60px;
  --space-4xl: 80px;

  /* Dimensões */
  --header-height: 70px;
  --max-width-content: 1200px;
  --border-radius-sm: 8px;
  --border-radius-md: 15px;
  --border-radius-lg: 20px;
  --border-radius-full: 25px;

  /* Transições */
  --transition-fast: all 0.2s ease;
  --transition: all 0.3s ease;
  --transition-slow: all 0.5s ease;

  /* Z-index */
  --z-header: 1000;
  --z-dropdown: 900;
  --z-overlay: 800;
}

/* ==========================================================
   3. TIPOGRAFIA
   ========================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-color);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.3rem, 3vw, 1.75rem);
}

p {
  line-height: 1.8;
  color: var(--text-light);
}

/* ==========================================================
   4. ANIMAÇÕES
   ========================================================== */

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ==========================================================
   5. LAYOUT PRINCIPAL
   ========================================================== */

/* 5.1. Header e Logo */
header {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-dark) 100%
  );
  height: var(--header-height);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header:hover {
  box-shadow: var(--shadow-xl);
}

.logo {
  margin-left: var(--space-xl);
  transition: var(--transition);
}

.logo h1 {
  color: var(--text-white);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  cursor: pointer;
  position: relative;
}

.logo h1::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--accent-color);
  transition: width 0.3s ease;
}

.logo h1:hover::after {
  width: 100%;
}

/* 5.2. Navegação Desktop */
nav {
  display: flex;
  align-items: center;
}

nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

nav ul li {
  position: relative;
}

nav ul li a {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  color: var(--text-white);
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

nav ul li a::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  transition: left 0.3s ease;
  z-index: -1;
}

nav ul li a:hover::before {
  left: 0;
}

nav ul li a:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

nav ul li a:active {
  transform: translateY(0);
}

/* 5.3. Menu Mobile */
.menu-item {
  display: none;
  margin-right: var(--space-xl);
  width: 45px;
  height: 45px;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  color: var(--text-white);
  font-size: 24px;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.menu-item:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

.menu-item:active {
  transform: rotate(90deg) scale(0.95);
}

/* ==========================================================
   6. SEÇÕES
   ========================================================== */

/* 6.1. Hero Section */
.hero {
  margin-top: var(--space-lg);
  position: relative;
  height: auto;
}

.hero img {
  width: 100%;
  display: block;
}

.hero-info {
  position: absolute;
  top: 50%;
  left: 10%;
  transform: translateY(-50%);
  width: 90%;
  max-width: 800px;
}

.hero-info h1 {
  color: var(--text-white);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.hero-info h2 {
  color: var(--accent-color);
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 500;
  margin-top: var(--space-xs);
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
}

.hero-info p {
  margin-top: var(--space-md);
  color: var(--text-white);
  font-size: clamp(0.7rem, 2vw, 1.2rem);
  max-width: 80%;
  line-height: 1.4;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

/* 6.2. About Section */
.about {
  padding: var(--space-4xl) var(--space-lg);
  background: linear-gradient(
    135deg,
    var(--bg-gray) 0%,
    var(--bg-gray-dark) 100%
  );
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.about-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  width: 100%;
}

.about-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.about-header h2 {
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.title-underline {
  width: 80px;
  height: 4px;
  background: var(--accent-color);
  margin: 0 auto;
  border-radius: 2px;
}

.about-content {
  display: grid;
  gap: 50px;
}

.about-text {
  background: var(--bg-white);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.about-text .intro-text {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.about-text p {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  margin-bottom: var(--space-md);
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.skill-category {
  background: linear-gradient(
    135deg,
    var(--bg-gray-light) 0%,
    var(--bg-gray) 100%
  );
  padding: 25px;
  border-radius: var(--border-radius-md);
  border: 2px solid transparent;
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--accent-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.skill-category h3 {
  font-size: 1.3rem;
  margin-bottom: var(--space-lg);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-category h3::before {
  content: "";
  width: 4px;
  height: 24px;
  background: var(--accent-color);
  border-radius: 2px;
}

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

.skill-category ul li {
  padding: 10px 0;
  color: var(--text-light);
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition-fast);
}

.skill-category ul li:hover {
  color: var(--text-color);
  padding-left: 5px;
}

/* 6.3. Projects Section */
.projects {
  padding: var(--space-4xl) var(--space-lg);
  background: var(--bg-white);
  min-height: 100vh;
}

.projects-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  width: 100%;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-2xl);
  margin-top: var(--space-3xl);
}

/* Project Card */
.project-card {
  background: var(--bg-gray-light);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.project-card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-info {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-info h3 {
  color: var(--primary-color);
  margin-bottom: var(--space-sm);
}

.project-info p {
  margin-bottom: var(--space-md);
  font-size: 1rem;
  flex-grow: 1;
}

/* Tags de Tecnologia */
.project-tags {
  margin-bottom: var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.project-tags .tag {
  background-color: var(--bg-gray-dark);
  color: var(--text-color);
  padding: 5px 10px;
  border-radius: var(--border-radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
}

/* Links de Ação */
.project-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.button-link {
  padding: 10px 15px;
  border-radius: var(--border-radius-full);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-fast);
  display: inline-block;
  text-align: center;
  border: 1px solid var(--accent-color);
  background-color: var(--accent-color);
  color: var(--text-color);
  box-shadow: var(--shadow-sm);
}

.button-link:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.button-link.secondary {
  background-color: transparent;
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.button-link.secondary:hover {
  background-color: var(--primary-dark);
  color: var(--text-white);
}

/* 6.4. Contact Section */
.contact {
  padding: var(--space-4xl) var(--space-lg);
  background: var(--bg-gray-light);
}

.contact-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  width: 100%;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-3xl);
  margin-top: var(--space-3xl);
  align-items: flex-start;
  background: var(--bg-white);
  padding: var(--space-3xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-info p {
  font-size: 1.1rem;
  color: var(--text-color);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.info-item strong {
  color: var(--primary-color);
  margin-right: var(--space-sm);
}

.info-item a {
  color: var(--primary-dark);
  text-decoration: none;
  transition: var(--transition-fast);
}

.info-item a:hover {
  color: var(--accent-color);
  text-decoration: underline;
}

/* Formulário */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  color: var(--text-color);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  font-size: 1rem;
}

.form-group input,
.form-group textarea {
  padding: 12px 15px;
  border: 2px solid var(--bg-gray-dark);
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  background: var(--bg-gray);
  color: var(--text-color);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.2);
  background: var(--bg-white);
}

.form-group textarea {
  resize: vertical;
}

.submit-btn {
  align-self: flex-start;
  margin-top: var(--space-md);
  padding: 12px 30px;
  background-color: var(--primary-color);
  color: var(--text-white);
  border: none;
  border-radius: var(--border-radius-full);
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.submit-btn:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* 6.5. Footer Section */
footer {
  background: var(--primary-dark);
  color: var(--text-white);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  border-top: 3px solid var(--accent-color);
  box-shadow: var(--shadow-xl);
}

.footer-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer-content p {
  color: var(--text-white);
  font-size: 0.95rem;
  font-weight: 300;
}

.social-links {
  display: flex;
  gap: var(--space-xl);
}

.social-links a {
  color: var(--bg-white);
  text-decoration: none;
  font-weight: 500;
  font-size: 1.05rem;
  padding: 5px 10px;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
}

.social-links a:hover {
  color: var(--accent-color);
  transform: translateY(-2px);
  text-shadow: 0 0 5px rgba(251, 191, 36, 0.5);
}

/* ==========================================================
   7. COMPONENTES
   ========================================================== */

/* 7.1. Botões */
button#contact {
  margin-top: var(--space-md);
  padding: 12px 25px;
  color: var(--text-color);
  background-color: var(--accent-color);
  border: 1px solid var(--accent-color);
  border-radius: var(--border-radius-full);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-block;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

button#contact:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
}

/* 7.2. Stats Cards */
.about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 25px;
  margin-top: var(--space-lg);
}

.stat-card {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-dark) 100%
  );
  padding: 35px 25px;
  border-radius: var(--border-radius-md);
  text-align: center;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat-number {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 900;
  color: var(--accent-color);
  display: block;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.stat-label {
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  color: var(--text-white);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ==========================================================
   8. UTILITÁRIOS E ACESSIBILIDADE
   ========================================================== */

a:focus,
button:focus {
  outline: 3px solid var(--accent-color);
  outline-offset: 2px;
}

.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-color);
  color: var(--text-color);
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

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

/* ==========================================================
   9. RESPONSIVIDADE
   ========================================================== */

/* Large Tablets (≤1024px) */
@media (max-width: 1024px) {
  .logo {
    margin-left: var(--space-lg);
  }

  .logo h1 {
    font-size: 24px;
  }

  nav ul li a {
    padding: 8px 16px;
    font-size: 15px;
  }

  .hero-info p {
    width: 60%;
  }

  .contact-content {
    gap: var(--space-2xl);
    padding: var(--space-2xl);
  }
}

/* Tablets (≤768px) */
@media (max-width: 768px) {
  .logo {
    margin-left: var(--space-md);
  }

  .logo h1 {
    font-size: 22px;
  }

  .menu-item {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-md);
  }

  nav {
    position: static;
  }

  nav ul {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: linear-gradient(
      135deg,
      var(--primary-color) 0%,
      var(--primary-dark) 100%
    );
    flex-direction: column;
    width: 100%;
    display: none;
    gap: 0;
    padding: var(--space-sm) 0;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  nav ul.active {
    display: flex;
    animation: slideDown 0.3s ease-out;
  }

  nav ul li {
    width: 100%;
    margin: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav ul li:last-child {
    border-bottom: none;
  }

  nav ul li a {
    padding: 18px 25px;
    border-radius: 0;
    text-align: left;
    border-left: 4px solid transparent;
    font-size: 16px;
  }

  nav ul li a:hover {
    background: rgba(255, 255, 255, 0.15);
    border-left-color: var(--accent-color);
    padding-left: 30px;
  }

  nav ul li a:active {
    background: rgba(255, 255, 255, 0.25);
  }

  .about-text {
    padding: var(--space-xl);
  }

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

  .about-stats {
    grid-template-columns: 1fr;
  }

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

  .project-card img {
    height: 200px;
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    padding: var(--space-xl);
  }

  .contact-info {
    order: 2;
  }

  .contact-form {
    order: 1;
  }

  .submit-btn {
    align-self: stretch;
  }

  footer {
    padding: var(--space-xl) var(--space-md);
  }

  .social-links {
    gap: var(--space-lg);
  }
}

/* Mobile (≤480px) */
@media (max-width: 480px) {
  :root {
    --header-height: 60px;
  }

  .logo {
    margin-left: var(--space-sm);
  }

  .logo h1 {
    font-size: 18px;
  }

  .menu-item {
    width: 40px;
    height: 40px;
    font-size: 22px;
    margin-right: var(--space-sm);
  }

  nav ul li a {
    padding: 16px var(--space-lg);
    font-size: 15px;
  }

  button#contact {
    display: flex;
  }

  .about {
    padding: var(--space-3xl) var(--space-md);
  }

  .about-header {
    margin-bottom: var(--space-2xl);
  }

  .about-text {
    padding: 25px;
  }

  .skill-category {
    padding: var(--space-lg);
  }

  .stat-card {
    padding: 25px var(--space-lg);
  }
}