/* ==========================================
   RESET & VARIÁVEIS GLOBAIS
   ========================================== */
:root {
  --bg-dark: #0a0a0a;
  --card-bg: #1e1e1e;
  --card-border: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  --accent-green: #22c55e;
  --accent-green-hover: #16a34a;
  --accent-blue: #007bff;
  --accent-blue-hover: #0056b3;
  --danger-red: #ef4444;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

/* ==========================================
   CABECALHO E NAVEGAÇÃO (HEADER & NAV)
   ========================================== */
.main-header {
  background-color: #141414;
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 12px;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.05);
}

.btn-create-nav {
  background-color: rgba(0, 123, 255, 0.15);
  color: var(--accent-blue) !important;
  border: 1px solid rgba(0, 123, 255, 0.3);
  font-weight: 600 !important;
}

.btn-create-nav:hover {
  background-color: var(--accent-blue) !important;
  color: #ffffff !important;
}

/* ==========================================
   ESTRUTURA GERAL DA PÁGINA
   ========================================== */
.container {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 20px;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

/* ==========================================
   SISTEMA DE ABAS / BOTÕES
   ========================================== */
.tabs-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.btn-tab {
  background-color: var(--card-bg);
  color: var(--text-secondary);
  border: 1px solid var(--card-border);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-tab.active {
  background-color: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

/* ==========================================
   CARDS DE TREINO / FICHAS (PÁGINA WORKOUTS)
   ========================================== */
.grid-workouts,
#workouts-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.workout-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  transition: transform 0.2s, border-color 0.2s;
}

.workout-card:hover {
  border-color: #404040;
  transform: translateY(-2px);
}

.workout-card h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.workout-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Card Vazio quando não há treinos */
.workout-card-empty {
  background-color: var(--card-bg);
  border: 1px dashed var(--card-border);
  border-radius: 12px;
  padding: 32px 20px;
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  grid-column: 1 / -1;
}

.workout-card-empty a {
  color: #3b82f6 !important;
  font-weight: 600;
  text-decoration: none;
  padding: 8px 16px;
  background-color: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: 8px;
  transition: all 0.2s;
}

.workout-card-empty a:hover {
  background-color: var(--accent-blue);
  color: #ffffff !important;
}

/* ==========================================
   BOTÕES GLOBAIS
   ========================================== */
button,
.btn-primary,
.btn-secondary,
.btn-finish {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  padding: 10px 16px;
  transition: background-color 0.2s, transform 0.1s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

button:active {
  transform: scale(0.98);
}

.btn-primary,
.btn-start {
  background-color: var(--accent-green);
  color: #ffffff;
  width: 100%;
}

.btn-primary:hover,
.btn-start:hover {
  background-color: var(--accent-green-hover);
}

/* ==========================================
   INPUTS & FORMULÁRIOS
   ========================================== */
input, select, textarea {
  font-family: inherit;
  background-color: #121212;
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: 8px;
  outline: none;
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent-blue);
}

/* ==========================================
   AJUSTES RESPONSIVOS MOBILE
   ========================================== */
@media (max-width: 600px) {
  .nav-container {
    padding: 10px 14px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .brand-logo {
    font-size: 1.15rem;
  }

  .nav-links {
    gap: 4px;
  }

  .nav-links a {
    font-size: 0.8rem;
    padding: 6px 8px;
  }

  .btn-create-nav {
    font-size: 0.8rem !important;
    padding: 6px 10px !important;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .btn-tab {
    flex: 1 1 auto;
    text-align: center;
    padding: 8px 12px;
    font-size: 0.85rem;
  }
}