/* ========================================
   Hi-Skill Institute - Main Stylesheet
   Modern Design System with Professional Colors
   ======================================== */

/* ========== ROOT VARIABLES & DESIGN SYSTEM ========== */
:root {
  /* Primary Colors */
  --primary: #1a3a52;           /* Deep Navy Blue */
  --secondary: #00d4ff;         /* Vibrant Teal */
  --accent: #ff6b35;            /* Warm Orange */
  
  /* Neutral Colors */
  --white: #ffffff;
  --light-bg: #f8f9fb;
  --light-gray: #e8eef5;
  --medium-gray: #a0aec0;
  --dark-gray: #4a5568;
  --text-dark: #1a202c;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #1a3a52 0%, #00d4ff 100%);
  --gradient-accent: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ========== RESET & BASE STYLES ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-dark);
  background-color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 3rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.25rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.875rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--dark-gray);
}

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

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

/* ========== CONTAINER ========== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

/* ========== HEADER & NAVIGATION ========== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--light-gray);
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.logo img {
  height: 50px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text strong {
  font-size: 1.25rem;
  color: var(--primary);
  font-family: 'Poppins', sans-serif;
}

.logo-text small {
  font-size: 0.75rem;
  color: var(--secondary);
  font-weight: 600;
}

/* Navigation */
nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

nav a {
  color: var(--text-dark);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

nav a:hover {
  color: var(--secondary);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: width var(--transition-fast);
}

nav a:hover::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary);
}

@media (max-width: 768px) {
  nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--white);
    border-bottom: 1px solid var(--light-gray);
    padding: var(--spacing-md);
  }

  nav.active {
    display: flex;
  }

  nav a {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--light-gray);
  }

  .menu-toggle {
    display: block;
  }
}

/* CTA Buttons in Header */
.header-cta {
  display: flex;
  gap: var(--spacing-sm);
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  font-family: 'Poppins', sans-serif;
  text-decoration: none;
  text-align: center;
}

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

.btn-primary:hover {
  background: #0f2438;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--secondary);
  color: var(--white);
}

.btn-secondary:hover {
  background: #00b8d4;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-accent:hover {
  background: #ff5722;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .header-cta {
    display: none;
  }
}

/* ========== HERO SECTION ========== */
.hero {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 6rem var(--spacing-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.2) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  animation: fadeInDown 0.8s ease-out;
}

.hero .highlight {
  color: var(--secondary);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.95);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

@media (max-width: 768px) {
  .hero {
    padding: 3rem var(--spacing-md);
  }

  .hero h1 {
    font-size: 2rem;
  }

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

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
  }
}

/* ========== STATS SECTION ========== */
.stats {
  background: var(--light-bg);
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  max-width: 1280px;
  margin: 0 auto;
}

.stat-card {
  text-align: center;
  padding: var(--spacing-lg);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 1rem;
  color: var(--dark-gray);
  font-weight: 500;
}

/* ========== CARDS ========== */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--light-gray);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.card-description {
  color: var(--dark-gray);
  font-size: 0.95rem;
}

.card-footer {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--light-gray);
}

/* ========== GRID LAYOUTS ========== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ========== SECTIONS ========== */
section {
  padding: var(--spacing-2xl) var(--spacing-lg);
}

section h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--primary);
}

.section-subtitle {
  text-align: center;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-2xl);
  font-size: 1.1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== TESTIMONIALS ========== */
.testimonial-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--secondary);
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-lg);
}

.stars {
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

.testimonial-text {
  font-style: italic;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-md);
}

.testimonial-author {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.testimonial-role {
  font-size: 0.9rem;
  color: var(--secondary);
}

/* ========== FORMS ========== */
form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--primary);
}

input,
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--light-gray);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

/* ========== FOOTER ========== */
footer {
  background: var(--primary);
  color: var(--white);
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  max-width: 1280px;
  margin: 0 auto;
  margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
  color: var(--secondary);
  margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

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

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--secondary);
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
}

/* ========== FLOATING ACTION BUTTONS ========== */
.floating-actions {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  z-index: 999;
}

.fab {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  border: none;
}

.fab-call {
  background: var(--accent);
}

.fab-call:hover {
  background: #ff5722;
  transform: scale(1.1);
}

.fab-whatsapp {
  background: #25d366;
}

.fab-whatsapp:hover {
  background: #20ba5a;
  transform: scale(1.1);
}

.fab-pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(255, 107, 53, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 107, 53, 0);
  }
}

@media (max-width: 768px) {
  .floating-actions {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
  }

  .fab {
    width: 50px;
    height: 50px;
    font-size: 1.25rem;
  }
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ========== UTILITY CLASSES ========== */
.text-center {
  text-align: center;
}

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

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

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

.bg-primary {
  background: var(--primary);
  color: var(--white);
}

.bg-secondary {
  background: var(--secondary);
  color: var(--white);
}

.bg-light {
  background: var(--light-bg);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 1024px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 1.875rem;
  }

  h3 {
    font-size: 1.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    font-size: 14px;
  }

  h1 {
    font-size: 1.875rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .container {
    padding: 0 var(--spacing-md);
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1rem;
  }

  section {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}