/* =========================================
   1. VARIABLES (Design Tokens)
   ========================================= */
:root {
  /* Matrix Theme Colors */
  --color-primary: #00FF41; 
  --color-primary-dark: #008F11;
  --color-bg-base: #0D0D0D;
  --color-bg-surface: #1A1A1A;
  --color-text-main: #E0E0E0;
  --color-text-muted: #A0A0A0;
  
  --color-whatsapp: #25D366;
  --color-whatsapp-hover: #1ebe5d;
  
  --font-main: 'Courier New', Courier, monospace; /* Aligning with Matrix/Software Engineer aesthetic */
  --font-secondary: 'Arial', sans-serif;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  
  --transition-speed: 0.3s;
}

/* =========================================
   2. RESET & BASE
   ========================================= */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-secondary);
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  color: var(--color-primary);
  font-family: var(--font-main);
  margin-top: 0;
  letter-spacing: -0.5px;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-speed) ease;
}

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

/* =========================================
   3. LAYOUT STRUCTURE
   ========================================= */
.header {
  background-color: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-primary-dark);
  padding-bottom: var(--spacing-lg);
}

.header__top-bar {
  display: flex;
  justify-content: flex-end;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg-base);
  border-bottom: 1px solid var(--color-primary-dark);
}

.header__banner {
  max-width: 900px;
  margin: var(--spacing-lg) auto 0;
}

.section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

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

.footer {
  background-color: var(--color-bg-surface);
  text-align: center;
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-primary-dark);
  font-family: var(--font-main);
  font-size: 0.9rem;
}

/* =========================================
   4. COMPONENTS
   ========================================= */

/* Language Switcher */
.lang-select {
  background-color: var(--color-bg-base);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-dark);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
  font-weight: bold;
  cursor: pointer;
  outline: none;
}

.lang-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 5px var(--color-primary-dark);
}

/* Navigation */
.nav__list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  list-style: none;
  padding: 0;
  margin: var(--spacing-lg) 0 0 0;
}

.nav__link {
  font-family: var(--font-main);
  font-weight: bold;
  font-size: 1.1rem;
}

.nav__link:hover {
  color: var(--color-primary);
  text-shadow: 0 0 8px var(--color-primary-dark);
}

/* Profile Image */
.profile-img {
  width: 260px;
  border-radius: var(--radius-md);
  margin: 0 auto var(--spacing-lg);
  border: 2px solid var(--color-primary-dark);
}

/* Card Component */
.card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-primary-dark);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0, 255, 65, 0.1);
  border-color: var(--color-primary);
}

.card__image {
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
  border: 1px solid #333;
}

.card__title {
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.card__description {
  flex-grow: 1;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.card__link {
  margin-top: auto;
}

/* List Component */
.list {
  list-style-type: none;
  padding: 0;
  text-align: left;
  max-width: 700px;
  margin: 0 auto;
}

.list__item {
  margin-bottom: var(--spacing-sm);
  position: relative;
  padding-left: 1.5rem;
}

.list__item::before {
  content: ">";
  color: var(--color-primary);
  font-family: var(--font-main);
  font-weight: bold;
  position: absolute;
  left: 0;
}

/* Buttons */
.button {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  font-family: var(--font-main);
  font-weight: bold;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  text-align: center;
}

.button--primary {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  width: 100%;
}

.button--primary:hover {
  background-color: var(--color-primary);
  color: var(--color-bg-base);
}

.button--whatsapp {
  background-color: var(--color-whatsapp);
  color: #fff;
  margin-top: var(--spacing-md);
}

.button--whatsapp:hover {
  background-color: var(--color-whatsapp-hover);
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--color-bg-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: bold;
  text-decoration: none;
  box-shadow: 0 0 10px rgba(0, 255, 65, 0.2);
  transition: all var(--transition-speed) ease;
  z-index: 1000;
}

.back-to-top:hover {
  background-color: var(--color-primary);
  color: var(--color-bg-base);
  box-shadow: 0 0 15px rgba(0, 255, 65, 0.6);
  transform: translateY(-3px);
}