/* ==================== */
/* DARK THEME CONSULTING WEBSITE */
/* ==================== */

/* CSS Variables - Color Scheme */
:root {
  --primary-bg: #0f0f0f;
  --secondary-bg: #1a1a1a;
  --tertiary-bg: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent-color: #00d4ff;
  --accent-hover: #00bfff;
  --border-color: #3a3a3a;
  --transition: all 0.3s ease;
}

/* ==================== */
/* GLOBAL STYLES */
/* ==================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--primary-bg);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
}

/* ==================== */
/* TYPOGRAPHY */
/* ==================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.25rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

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

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

/* ==================== */
/* NAVIGATION */
/* ==================== */

nav {
  background-color: var(--secondary-bg);
  border-bottom: 2px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-color);
  text-decoration: none;
}

/* ==================== */
/* LAYOUT */
/* ==================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2.5rem;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--accent-color);
  margin: 1rem auto 0;
}

/* ==================== */
/* HERO SECTION */
/* ==================== */

.hero {
  background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--tertiary-bg) 100%);
  padding: 8rem 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ==================== */
/* BUTTONS */
/* ==================== */

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border: 2px solid var(--accent-color);
  color: var(--accent-color);
  background-color: transparent;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn:hover {
  background-color: var(--accent-color);
  color: var(--primary-bg);
  text-decoration: none;
}

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

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

/* ==================== */
/* CARDS */
/* ==================== */

.card {
  background-color: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 2rem;
  transition: var(--transition);
  margin-bottom: 2rem;
}

.card:hover {
  border-color: var(--accent-color);
  background-color: var(--tertiary-bg);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 212, 255, 0.1);
}

.card h3 {
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.card p {
  color: var(--text-secondary);
}

/* ==================== */
/* GRID LAYOUT */
/* ==================== */

.grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

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

/* ==================== */
/* FORMS */
/* ==================== */

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

label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="phone"],
textarea,
select {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--tertiary-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: inherit;
  transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="phone"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.1);
}

select option {
  background-color: var(--tertiary-bg);
  color: var(--text-primary);
}

textarea {
  resize: vertical;
  min-height: 150px;
}

/* ==================== */
/* FOOTER */
/* ==================== */

footer {
  background-color: var(--secondary-bg);
  border-top: 2px solid var(--border-color);
  padding: 3rem 0;
  margin-top: 5rem;
}

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

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

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--text-secondary);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

/* ==================== */
/* UTILITY CLASSES */
/* ==================== */

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

.text-accent {
  color: var(--accent-color);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

/* ==================== */
/* RESPONSIVE DESIGN */
/* ==================== */

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  .hero {
    padding: 4rem 0;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero .subtitle {
    font-size: 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .section {
    padding: 3rem 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .container {
    padding: 0 1.5rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  .container {
    padding: 0 1rem;
  }

  .section {
    padding: 2rem 0;
  }

  .btn {
    padding: 0.6rem 1.5rem;
    font-size: 0.9rem;
  }

  .card {
    padding: 1.5rem;
  }
}