/* ============================================================
   PORTFÓLIO — KAUAN LUCAS
   CSS organizado em seções:
   1. Variáveis e Reset
   2. Base e Tipografia
   3. Utilitários e Componentes
   4. Header / Navegação
   5. Hero
   6. Sobre
   7. Habilidades
   8. Projetos
   9. Contato
   10. Footer
   11. Back to Top
   12. Animações
   13. Responsividade
============================================================ */


/* ============================================================
   1. VARIÁVEIS E RESET
============================================================ */
:root {
  /* Cores */
  --color-bg:          #080b12;
  --color-bg-2:        #0d1120;
  --color-bg-card:     #111827;
  --color-bg-card-2:   #161f30;
  --color-border:      rgba(255, 255, 255, 0.07);
  --color-border-2:    rgba(255, 255, 255, 0.12);

  --color-text:        #e8eaf0;
  --color-text-muted:  #8892a4;
  --color-text-faint:  #4a5568;

  --color-accent:      #4f8ef7;
  --color-accent-2:    #7c5cfc;
  --color-accent-glow: rgba(79, 142, 247, 0.3);

  --color-success:     #34d399;
  --color-error:       #f87171;

  /* Gradientes */
  --gradient-primary:  linear-gradient(135deg, #4f8ef7 0%, #7c5cfc 100%);
  --gradient-glow:     linear-gradient(135deg, rgba(79,142,247,0.15) 0%, rgba(124,92,252,0.15) 100%);

  /* Tipografia */
  --font-display:      'Syne', sans-serif;
  --font-body:         'DM Sans', sans-serif;

  --fs-xs:    0.75rem;
  --fs-sm:    0.875rem;
  --fs-base:  1rem;
  --fs-md:    1.125rem;
  --fs-lg:    1.25rem;
  --fs-xl:    1.5rem;
  --fs-2xl:   2rem;
  --fs-3xl:   2.75rem;
  --fs-4xl:   3.5rem;
  --fs-5xl:   4.5rem;
  --fs-6xl:   6rem;

  /* Espaçamentos */
  --spacing-xs:      4px;
  --spacing-sm:      8px;
  --spacing-md:      16px;
  --spacing-lg:      24px;
  --spacing-xl:      40px;
  --spacing-2xl:     64px;
  --spacing-3xl:     96px;
  --spacing-section: 120px;

  /* Layout */
  --container-max:  1180px;
  --container-pad:  24px;
  --border-radius:  12px;
  --border-radius-lg: 20px;

  /* Transições */
  --transition-fast:   0.15s ease;
  --transition-base:   0.3s ease;
  --transition-slow:   0.6s ease;

  /* Sombras */
  --shadow-sm:    0 2px 8px rgba(0,0,0,0.3);
  --shadow-md:    0 8px 24px rgba(0,0,0,0.4);
  --shadow-lg:    0 20px 60px rgba(0,0,0,0.5);
  --shadow-glow:  0 0 40px rgba(79,142,247,0.2);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

::selection {
  background: var(--color-accent);
  color: #fff;
}

/* Scrollbar personalizada */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 3px;
}


/* ============================================================
   2. BASE E TIPOGRAFIA
============================================================ */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

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

.hide-mobile { display: none; }


/* ============================================================
   3. UTILITÁRIOS E COMPONENTES
============================================================ */

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

/* Seção header padrao */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
}

.section-eyebrow {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: clamp(var(--fs-2xl), 4vw, var(--fs-4xl));
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
}

/* Botões */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: 500;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

/* Efeito de brilho ao hover no btn primário */
.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(79,142,247,0.25);
}

.btn--primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79,142,247,0.4);
}

.btn--primary:hover::before { opacity: 1; }

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-2);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(79,142,247,0.06);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-2);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn--sm { padding: 10px 20px; font-size: var(--fs-sm); }

.btn--full { width: 100%; justify-content: center; }

/* Tags */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: var(--fs-xs);
  font-weight: 500;
  background: rgba(255,255,255,0.06);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.tag--green {
  background: rgba(52, 211, 153, 0.1);
  color: var(--color-success);
  border-color: rgba(52, 211, 153, 0.2);
}


/* ============================================================
   4. HEADER / NAVEGAÇÃO
============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: all var(--transition-base);
}

/* Classe adicionada via JS ao rolar */
.header--scrolled {
  padding: 12px 0;
  background: rgba(8, 11, 18, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

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

.nav__logo {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav__logo-dot {
  color: var(--color-accent);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

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

/* Menu toggle mobile */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 101;
}

.nav__toggle-line {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: all var(--transition-base);
  transform-origin: center;
}

/* Estado aberto do toggle */
.nav__toggle.is-open .nav__toggle-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__toggle.is-open .nav__toggle-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__toggle.is-open .nav__toggle-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}


/* ============================================================
   5. HERO
============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

/* Grade animada de fundo */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(79,142,247,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,142,247,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}

/* Orbs de luz no fundo */
.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
}

.hero__orb--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79,142,247,0.3) 0%, transparent 70%);
  top: -100px;
  right: -100px;
  animation: orbFloat 8s ease-in-out infinite;
}

.hero__orb--2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(124,92,252,0.25) 0%, transparent 70%);
  bottom: -50px;
  left: 10%;
  animation: orbFloat 10s ease-in-out infinite reverse;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(20px, -30px); }
  66% { transform: translate(-15px, 20px); }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

/* Badge "Disponível" */
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  border: 1px solid rgba(52,211,153,0.25);
  background: rgba(52,211,153,0.08);
  font-size: var(--fs-sm);
  color: var(--color-success);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

/* Nome principal */
.hero__name {
  font-size: clamp(var(--fs-4xl), 9vw, var(--fs-6xl));
  color: var(--color-text);
  line-height: 0.95;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.04em;
}

.hero__name-accent {
  /* Gradiente no nome de destaque */
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Título abaixo do nome */
.hero__title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(var(--fs-xl), 3.5vw, var(--fs-3xl));
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.hero__title-highlight {
  color: var(--color-accent);
}

/* Tagline */
.hero__tagline {
  font-size: clamp(var(--fs-base), 2vw, var(--fs-md));
  color: var(--color-text-muted);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

/* Botões do Hero */
.hero__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

/* Stats no Hero */
.hero__stats {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.hero__stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--color-text);
  line-height: 1;
}

.hero__stat-label {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 40px;
  right: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.4;
}

.hero__scroll span {
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  writing-mode: vertical-rl;
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
  100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}


/* ============================================================
   6. SOBRE MIM
============================================================ */
.sobre {
  padding: var(--spacing-section) 0;
  background: var(--color-bg-2);
  position: relative;
}

.sobre::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-2), transparent);
}

.sobre__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

/* Visual / card esquerda */
.sobre__visual {
  position: relative;
}

.sobre__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.sobre__avatar {
  position: relative;
  width: 100px;
  height: 100px;
}

.sobre__avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  border: 2px solid var(--color-border-2);
}

.sobre__avatar-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(79,142,247,0.3);
  animation: ring 3s ease-in-out infinite;
}

@keyframes ring {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.08); opacity: 1; }
}

.sobre__info-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

/* Card flutuante de tech stack */
.sobre__floating-card {
  position: relative;
  bottom: auto;
  right: auto;
  background: var(--color-bg-card-2);
  border: 1px solid var(--color-border-2);
  border-radius: var(--border-radius);
  padding: 16px 20px;
  min-width: 160px;
  box-shadow: var(--shadow-md);
  margin-top: 16px;
}

.sobre__floating-label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: 10px;
}

.sobre__tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sobre__tech-list span {
  font-size: var(--fs-xs);
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  font-weight: 500;
}

/* Texto direita */
.sobre__paragraphs {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.sobre__paragraphs p {
  font-size: var(--fs-md);
  line-height: 1.8;
}

.sobre__highlights {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.sobre__highlight {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}


/* ============================================================
   7. HABILIDADES
============================================================ */
.habilidades {
  padding: var(--spacing-section) 0;
  position: relative;
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

/* Card de skill */
.skill-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-glow);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.skill-card:hover {
  border-color: rgba(79,142,247,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.skill-card:hover::before { opacity: 1; }

.skill-card__icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.skill-card__name {
  font-size: var(--fs-lg);
  color: var(--color-text);
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}

.skill-card__desc {
  font-size: var(--fs-sm);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.skill-card__level {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.skill-card__level span {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  white-space: nowrap;
}

/* Barra de progresso animada via JS (IntersectionObserver) */
.skill-bar {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: 2px;
  overflow: hidden;
}

.skill-bar::after {
  content: '';
  display: block;
  height: 100%;
  width: 0;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Quando visível, a barra expande */
.skill-bar.is-animated::after {
  width: var(--level);
}


/* ============================================================
   8. PROJETOS
============================================================ */
.projetos {
  padding: var(--spacing-section) 0;
  background: var(--color-bg-2);
}

.projetos::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-2), transparent);
}

.projetos { position: relative; }

.projects__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

/* Card de projeto */
.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  border-color: rgba(79,142,247,0.25);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Projeto em destaque ocupa 2 colunas */
.project-card--featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
}

.project-card--featured .project-card__image {
  min-height: 280px;
}

/* Imagem / placeholder visual */
.project-card__image {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  background: var(--color-bg);
}

.project-card__img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  object-position: top;
  display: block;
  transition: transform var(--transition-base);
}

.project-card--featured .project-card__img {
  min-height: 280px;
}

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

.project-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0d1120 0%, #111827 100%);
  padding: var(--spacing-lg);
  position: relative;
  min-height: inherit;
}

.project-card__placeholder--2 {
  background: linear-gradient(135deg, #0a0e1a 0%, #0f1829 100%);
}

.project-card__placeholder--3 {
  background: linear-gradient(135deg, #0d0a1a 0%, #150f28 100%);
}

/* Numero do projeto no fundo */
.project-card__placeholder::after {
  content: attr(data-num);
  position: absolute;
  bottom: 12px;
  right: 16px;
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 800;
  color: rgba(255,255,255,0.03);
  line-height: 1;
}

/* Mockup visual dentro do placeholder */
.project-card__mockup {
  width: 100%;
  max-width: 320px;
  background: #1a2035;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.mockup-bar {
  height: 28px;
  background: #131b2e;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 6px;
}

.mockup-bar::before {
  content: '';
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  box-shadow: 14px 0 0 rgba(255,255,255,0.1), 28px 0 0 rgba(255,255,255,0.1);
}

.mockup-content {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mockup-hero {
  height: 80px;
  background: linear-gradient(135deg, rgba(79,142,247,0.2), rgba(124,92,252,0.15));
  border-radius: 6px;
}

.mockup-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.mockup-grid > div {
  height: 50px;
  background: rgba(255,255,255,0.04);
  border-radius: 4px;
}

.mockup-content {
  padding: 10px;
  display: flex;
  gap: 8px;
}

.mockup-sidebar {
  width: 70px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.mockup-sidebar > div {
  height: 24px;
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
}

.mockup-sidebar > div:first-child {
  background: rgba(79,142,247,0.15);
}

.mockup-main {
  flex: 1;
  background: rgba(255,255,255,0.03);
  border-radius: 4px;
  min-height: 120px;
}

.mockup-cards {
  width: 100%;
  display: flex;
  gap: 8px;
  padding: 8px 0;
}

.mockup-card-item {
  flex: 1;
  height: 100px;
  background: rgba(255,255,255,0.04);
  border-radius: 6px;
}

/* Overlay ao hover */
.project-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 11, 18, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
  backdrop-filter: blur(4px);
}

.project-card:hover .project-card__overlay {
  opacity: 1;
}

.project-card__links {
  display: flex;
  gap: 12px;
}

.project-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--color-bg-card-2);
  border: 1px solid var(--color-border-2);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* Corpo do card */
.project-card__body {
  padding: var(--spacing-lg);
}

.project-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

/* Tag de categoria do projeto */
.project-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(79,142,247,0.1);
  color: var(--color-accent);
}

.project-tag--blue {
  background: rgba(59,130,246,0.1);
  color: #60a5fa;
}

.project-tag--purple {
  background: rgba(124,92,252,0.1);
  color: #a78bfa;
}

.project-number {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  color: var(--color-text-faint);
  font-weight: 700;
}

.project-card__title {
  font-size: var(--fs-xl);
  color: var(--color-text);
  margin-bottom: 8px;
}

.project-card__desc {
  font-size: var(--fs-sm);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-card__tech span {
  padding: 3px 10px;
  border-radius: 4px;
  font-size: var(--fs-xs);
  background: rgba(255,255,255,0.04);
  color: var(--color-text-faint);
  border: 1px solid var(--color-border);
}

.projects__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--spacing-md);
  text-align: center;
}

.projects__cta p {
  font-size: var(--fs-md);
}


/* ============================================================
   9. CONTATO
============================================================ */
.contato {
  padding: var(--spacing-section) 0;
}

.contato__grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.contato__desc {
  font-size: var(--fs-md);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

/* Links sociais */
.contato__social {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-radius: var(--border-radius);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-weight: 500;
  transition: all var(--transition-base);
}

.social-link:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
  background: var(--color-bg-card-2);
  transform: translateX(4px);
}

/* Formulário */
.contato__form-wrapper {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
}

.contato__form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-2);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  transition: all var(--transition-fast);
  outline: none;
  appearance: none;
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-input::placeholder { color: var(--color-text-faint); }

.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234a5568' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Validação: estado de erro */
.form-input.is-error { border-color: var(--color-error); }

.form-error {
  font-size: var(--fs-xs);
  color: var(--color-error);
  min-height: 16px;
}

/* Mensagem de sucesso */
.form-success {
  text-align: center;
  font-size: var(--fs-sm);
  color: var(--color-success);
  background: rgba(52,211,153,0.08);
  border: 1px solid rgba(52,211,153,0.2);
  border-radius: 8px;
  padding: 12px;
  display: none;
}

.form-success.is-visible { display: block; }


/* ============================================================
   10. FOOTER
============================================================ */
.footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.footer__copy {
  font-size: var(--fs-sm);
  color: var(--color-text-faint);
}

.footer__links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer__links a {
  font-size: var(--fs-sm);
  color: var(--color-text-faint);
  transition: color var(--transition-fast);
}

.footer__links a:hover { color: var(--color-accent); }


/* ============================================================
   11. BACK TO TOP
============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all var(--transition-base);
  box-shadow: 0 4px 16px rgba(79,142,247,0.3);
  z-index: 99;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(79,142,247,0.4);
}


/* ============================================================
   12. ANIMAÇÕES (fade-up, fade-left, fade-right)
   Controladas via IntersectionObserver no JS.
============================================================ */
.fade-up,
.fade-left,
.fade-right {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up { transform: translateY(30px); }
.fade-left { transform: translateX(-30px); }
.fade-right { transform: translateX(30px); }

/* Quando o elemento entra na viewport */
.is-visible {
  opacity: 1 !important;
  transform: translate(0) !important;
}

/* Delay customizado via CSS var */
[style*="--delay"] {
  transition-delay: var(--delay, 0s);
}


/* ============================================================
   13. RESPONSIVIDADE (mobile-first expansivo)
============================================================ */

/* Tablet: 768px+ */
@media (min-width: 768px) {
  .hide-mobile { display: inline; }
  :root {
    --container-pad: 40px;
  }
}

/* Desktop médio: 900px+ */
@media (min-width: 900px) {
  .nav__menu { display: flex; }
  .nav__toggle { display: none; }
}

/* Telas menores que 900px — mobile/tablet */
@media (max-width: 899px) {
  :root {
    --spacing-section: 72px;
  }

  .nav__toggle { display: flex; }

  /* Menu mobile: abre como overlay */
  .nav__menu {
    position: fixed;
    inset: 0;
    background: rgba(8, 11, 18, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: 100;
  }

  .nav__menu.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    font-size: var(--fs-2xl);
    font-family: var(--font-display);
  }

  /* Hero */
  .hero__scroll { display: none; }

  /* Sobre */
  .sobre__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .sobre__visual { max-width: 360px; margin: 0 auto; }

  .sobre__floating-card {
    bottom: -16px;
    right: -8px;
  }

  /* Projetos */
  .projects__grid {
    grid-template-columns: 1fr;
  }

  .project-card--featured {
    grid-template-columns: 1fr;
  }

  /* Contato */
  .contato__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  /* Back to top */
  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

/* Telas muito pequenas: <400px */
@media (max-width: 399px) {
  :root { --container-pad: 16px; }
  .hero__actions { flex-direction: column; align-items: flex-start; }
  .btn { width: 100%; justify-content: center; }
  .hero__stats { gap: var(--spacing-lg); }
  .hero__stat-divider { display: none; }
}

/* ============================================================
   14. NOVOS ESTILOS — MELHORIAS v2
============================================================ */

/* Separador e ícones sociais no nav */
.nav__social-sep {
  width: 1px;
  height: 20px;
  background: var(--color-border-2);
  margin: 0 4px;
}

.nav__social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__social-icon:hover {
  color: var(--color-accent);
  background: rgba(79,142,247,0.08);
}

/* Botão WhatsApp */
.btn--whatsapp {
  background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(37,211,102,0.25);
}

.btn--whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37,211,102,0.4);
}

/* Social links extras */
.social-link--whatsapp { color: #25d366 !important; }
.social-link--email { color: var(--color-text-muted) !important; }

/* Grid 4 colunas de projetos */
.projects__grid--4col {
  grid-template-columns: repeat(2, 1fr);
}

.projects__grid--4col .project-card--featured {
  grid-column: auto;
  display: block;
}

/* Project tag verde */
.project-tag--green {
  background: rgba(52,211,153,0.12);
  color: var(--color-success);
  border-color: rgba(52,211,153,0.25);
}

/* CTA direto no formulário de contato */
.contato__cta-direct {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.contato__note {
  font-size: var(--fs-xs);
  text-align: center;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* Mockup login para projeto 4 */
.mockup-login {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 12px;
}

.mockup-login-box {
  width: 80%;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mockup-login-box div {
  height: 8px;
  border-radius: 4px;
  background: rgba(79,142,247,0.2);
}

.mockup-login-box div:first-child { width: 60%; }
.mockup-login-box div:nth-child(2) { width: 100%; }
.mockup-login-box div:last-child {
  width: 100%;
  height: 28px;
  background: rgba(79,142,247,0.35);
  border-radius: 6px;
  margin-top: 4px;
}

/* Placeholder 4 (login) */
.project-card__placeholder--4 {
  background: linear-gradient(135deg, #0d1120 0%, #111827 100%);
}

/* Responsivo: 4 projetos vira coluna única no mobile */
@media (max-width: 767px) {
  .projects__grid--4col {
    grid-template-columns: 1fr;
  }
  .nav__social-sep,
  .nav__social-icon { display: none; }
}