/*
  Landra AI & Web Solutions Agency - Global Stylesheet
  Author: Frontend Architect AI
*/

/* 1. CSS Variables (Design System) */
:root {
  --primary-color: #0a192f; /* Deep Navy Blue */
  --secondary-color: #112240; /* Lighter Navy */
  --accent-color: #64ffda; /* Bright Mint/Teal */
  --accent-color-hover: rgba(100, 255, 218, 0.1);
  --text-color-light: #ccd6f6; /* Light Slate */
  --text-color-dark: #8892b0; /* Slate */
  --heading-color: #e6f1ff; /* Lightest Slate */
  --background-color: #0a192f;
  --white-color: #ffffff;
  --border-color: #233554;

  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

  --font-size-base: 16px;
  --line-height-base: 1.6;

  --spacing-unit: 8px;
  --container-padding: calc(var(--spacing-unit) * 2);
  --container-width: 1100px;

  --border-radius: 4px;
  --transition-speed: 0.3s ease;
  --box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
}

/* 2. Global Resets & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-color-dark);
  background-color: var(--background-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--heading-color);
  font-weight: 600;
  line-height: 1.2;
}

h1 { font-size: clamp(40px, 8vw, 80px); }
h2 { font-size: clamp(30px, 5vw, 40px); }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: calc(var(--spacing-unit) * 2);
}

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

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

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

/* 3. Utility Classes */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding: 100px 0;
}

.section-title {
  position: relative;
  font-size: 2rem;
  margin-bottom: 40px;
  padding-bottom: 10px;
  text-align: center;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--accent-color);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.text-center {
  text-align: center;
}

/* 4. Component Styles */

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-family-mono);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-speed);
  border: 1px solid var(--accent-color);
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--primary-color);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent-color);
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-color);
}

.btn-outline:hover {
  background-color: var(--accent-color-hover);
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 2rem;
  background-color: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(10px);
  transition: top var(--transition-speed);
}

.header.scrolled {
  box-shadow: var(--box-shadow);
}

.header-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-color-light);
  font-family: var(--font-family-mono);
  font-size: 0.9rem;
}

.nav-link.active, .nav-link:hover {
  color: var(--accent-color);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.hamburger-icon {
  width: 30px;
  height: 22px;
  position: relative;
}

.hamburger-icon span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  background: var(--accent-color);
  border-radius: 3px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: .25s ease-in-out;
}

.hamburger-icon span:nth-child(1) { top: 0px; }
.hamburger-icon span:nth-child(2) { top: 9px; }
.hamburger-icon span:nth-child(3) { top: 18px; }

.nav-open .hamburger-icon span:nth-child(1) { top: 9px; transform: rotate(135deg); }
.nav-open .hamburger-icon span:nth-child(2) { opacity: 0; left: -30px; }
.nav-open .hamburger-icon span:nth-child(3) { top: 9px; transform: rotate(-135deg); }

/* Cards (for services, portfolio, etc.) */
.card {
  background-color: var(--secondary-color);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: transform var(--transition-speed);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-10px);
}

.card-icon {
  color: var(--accent-color);
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.25rem;
  color: var(--heading-color);
  margin-bottom: 0.75rem;
}

.card-text {
  color: var(--text-color-dark);
  flex-grow: 1;
}

.card-link {
  margin-top: 1rem;
  font-weight: 500;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-color-light);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--secondary-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-color-light);
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-color);
}

/* Accordion (for FAQ) */
.accordion-item {
  border-bottom: 1px solid var(--border-color);
}

.accordion-header {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 1.5rem 1rem;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--heading-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-speed);
}

.accordion-header:hover {
  background-color: var(--accent-color-hover);
}

.accordion-header::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent-color);
  transition: transform var(--transition-speed);
}

.accordion-item.active .accordion-header::after {
  transform: rotate(45deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.accordion-content p {
  padding: 0 1rem 1.5rem;
  margin: 0;
}

/* Footer */
.footer {
  background-color: var(--secondary-color);
  padding: 4rem 0 2rem;
  text-align: center;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
  text-align: left;
}

.footer-col h4 {
  color: var(--heading-color);
  margin-bottom: 1rem;
}

.footer-col p, .footer-col a {
  color: var(--text-color-dark);
  font-size: 0.9rem;
}

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

.social-links a {
  display: inline-block;
  margin-right: 1rem;
  font-size: 1.5rem;
}

.copyright {
  font-size: 0.8rem;
  color: var(--text-color-dark);
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

/* 5. Responsive Design */
@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(75vw, 400px);
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    background-color: var(--secondary-color);
    box-shadow: -10px 0px 30px -15px rgba(2,12,27,0.7);
    transition: right var(--transition-speed);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-link {
    font-size: 1.2rem;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .header-nav .btn {
    display: none; /* Hide contact button in nav on mobile, it's in the menu */
  }
}