/* ===============================
   Vignan Consultancy Services - Custom CSS
   Bootstrap Replacement - Lightweight & Responsive
   =============================== */

/* ========== CSS Variables & Reset ========== */
:root {
  /* Color Palette */
  --primary: #1e88e5;
  --primary-dark: #1565c0;
  --primary-light: #64b5f6;
  --accent: #ff6a00;
  --accent-dark: #e55f00;
  --accent-light: #ff983d;
  --dark: #1a1f2e;
  --dark-light: #2b3445;
  --light: #f5f7fb;
  --light-gray: #e5e7eb;
  --medium-gray: #9ca3af;
  --dark-gray: #6b7280;
  --white: #ffffff;
  --black: #000000;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  
  /* Spacing */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Container */
  --container-max-width: 1200px;
  --container-padding: 1rem;
}

/* ========== CSS Reset ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--dark-light);
  background-color: var(--white);
  overflow-x: hidden;
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-md);
  color: var(--dark);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--space-md);
}

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

a:hover,
a:focus {
  color: var(--primary-dark);
  text-decoration: underline;
}

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

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

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========== Layout & Containers ========== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ========== Skip Link ========== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: var(--white);
  padding: var(--space-sm) var(--space-md);
  z-index: 1000;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
}

/* ========== Top Bar ========== */
.top-bar {
  background: var(--primary);
  color: var(--white);
  padding: var(--space-sm) 0;
  font-size: var(--font-size-sm);
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-item {
  display: inline-block;
}

.phone-link {
  color: var(--white);
  font-weight: 600;
}

.phone-link:hover {
  color: var(--white);
  text-decoration: none;
  opacity: 0.9;
}

/* ========== Header ========== */
.site-header {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo-container {
  flex-shrink: 0;
}

.logo {
  height: 64px;
  width: auto;
}

.contact-info {
  display: flex;
  gap: var(--space-lg);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.icon-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.contact-label {
  font-size: var(--font-size-sm);
  color: var(--dark-gray);
}

.contact-value {
  font-weight: 600;
  color: var(--dark);
}

/* ========== Navigation ========== */
.main-nav {
  background: var(--light);
  border-top: 1px solid var(--light-gray);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  margin-left: auto;
}

.hamburger-box {
  width: 24px;
  height: 18px;
  display: inline-block;
  position: relative;
}

.hamburger-line {
  width: 100%;
  height: 2px;
  background-color: var(--dark);
  position: absolute;
  left: 0;
  transition: all var(--transition-base);
}

.hamburger-line:nth-child(1) {
  top: 0;
}

.hamburger-line:nth-child(2) {
  top: 8px;
}

.hamburger-line:nth-child(3) {
  top: 16px;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg);
  top: 8px;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg);
  top: 8px;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
}

.nav-link {
  display: block;
  padding: var(--space-md) var(--space-lg);
  color: var(--dark);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
  color: var(--primary);
  text-decoration: none;
  background: var(--white);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-lg);
  right: var(--space-lg);
  height: 3px;
  background: var(--accent);
}

.nav-dropdown {
  position: relative;
}

.dropdown-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.dropdown-toggle::after {
  content: '▼';
  font-size: var(--font-size-xs);
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .dropdown-toggle::after,
.nav-dropdown:focus-within .dropdown-toggle::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  min-width: 200px;
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: 10;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--dark);
  border-bottom: 1px solid var(--light-gray);
}

.dropdown-menu a:hover {
  background: var(--light);
  color: var(--primary);
}

.dropdown-menu a:last-child {
  border-bottom: none;
}

.nav-phone {
  margin-left: auto;
}

.nav-phone .phone {
  font-weight: 600;
  color: var(--primary);
}

/* ========== Hero Section ========== */
.hero {
  position: relative;
  margin-top: 0;
  overflow: hidden;
}

.hero-slider {
  position: relative;
  height: 520px;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.hero-slide.active {
  opacity: 1;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-bg-1 {
  background-image: url('/images/bg/bg301.jpg');
}

.hero-bg-2 {
  background-image: url('/images/bg/bg11.jpg');
}

.hero-bg-3 {
  background-image: url('/images/bg/bg2.jpg');
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.35);
}

.hero-content {
  position: relative;
  color: var(--white);
  height: 520px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 600px;
}

.hero-content h1,
.hero-content h2 {
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
  margin-bottom: var(--space-md);
}

.hero-content p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  opacity: 0.9;
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-controls {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  padding: 0 var(--space-md);
  pointer-events: none;
  z-index: 5;
}

.hero-control {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  cursor: pointer;
  transition: all var(--transition-fast);
  pointer-events: all;
  backdrop-filter: blur(10px);
}

.hero-control:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.hero-indicators {
  position: absolute;
  bottom: var(--space-xl);
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  z-index: 5;
}

.hero-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--white);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.hero-indicator.active {
  background: var(--white);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
  white-space: nowrap;
}

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

.btn-primary:hover,
.btn-primary:focus {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover,
.btn-secondary:focus {
  background: var(--white);
  color: var(--dark);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover,
.btn-accent:focus {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--white);
  text-decoration: none;
}

/* ========== Sections ========== */
.section {
  padding: var(--space-3xl) 0;
}

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

.section-testimonial {
  position: relative;
  color: var(--white);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-header-light h2,
.section-header-light p {
  color: var(--white);
}

.section-divider {
  margin: var(--space-md) 0;
}

.section-divider img {
  height: 10px;
  width: auto;
}

.max-width-800 {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== Feature Cards ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.feature-card {
  background: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--light-gray);
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.feature-card h4 {
  margin-bottom: var(--space-sm);
  color: var(--dark);
}

/* ========== Services Grid ========== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-lg);
}

.service-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--white);
  border: 1px solid var(--light-gray);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.service-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.service-content h3 {
  margin-bottom: var(--space-sm);
  color: var(--dark);
}

/* ========== Courses Grid ========== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.course-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.course-image {
  height: 200px;
  overflow: hidden;
}

.course-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.course-card:hover .course-image img {
  transform: scale(1.05);
}

.course-content {
  padding: var(--space-lg);
}

.course-content h3 {
  margin-bottom: var(--space-sm);
  color: var(--dark);
}

/* ========== Universities Grid ========== */
.universities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-xl);
  text-align: center;
}

.university-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.university-logo img {
  height: 60px;
  width: auto;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: all var(--transition-base);
}

.university-logo:hover img {
  filter: grayscale(0%);
  opacity: 1;
  transform: scale(1.1);
}

.university-logo p {
  font-size: var(--font-size-sm);
  color: var(--dark-gray);
  margin: 0;
}

/* ========== Testimonials ========== */
.testimonial-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('/images/bg/bg2.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  filter: brightness(0.55);
}

.testimonial-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  position: relative;
  z-index: 2;
}

.testimonial-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(10px);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.testimonial-author img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.author-info strong {
  display: block;
  color: var(--white);
  margin-bottom: var(--space-xs);
}

.author-info span {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* ========== Blog Grid ========== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.blog-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.blog-image {
  height: 200px;
  overflow: hidden;
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-image img {
  transform: scale(1.05);
}

.blog-content {
  padding: var(--space-lg);
  position: relative;
}

.blog-date {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.blog-content h3 {
  margin-bottom: var(--space-sm);
  color: var(--dark);
}

.blog-link {
  display: inline-block;
  font-weight: 600;
  color: var(--primary);
  margin-top: var(--space-sm);
}

.blog-link:hover {
  color: var(--primary-dark);
  text-decoration: none;
}

/* ========== Contact Section ========== */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact-card {
  background: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.contact-card h3 {
  margin-bottom: var(--space-lg);
  color: var(--dark);
}

.office-info p {
  margin-bottom: var(--space-md);
}

.office-info strong {
  color: var(--dark);
}

.contact-details p {
  margin-bottom: var(--space-sm);
}

/* ========== Forms ========== */
.contact-form {
  background: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.contact-form h3 {
  margin-bottom: var(--space-lg);
  color: var(--dark);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 600;
  color: var(--dark);
}

.required {
  color: #dc2626;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.1);
}

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

.error-message {
  color: #dc2626;
  font-size: var(--font-size-sm);
  margin-top: var(--space-xs);
  display: none;
}

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: #dc2626;
}

.form-group.has-error .error-message {
  display: block;
}

.hp {
  position: absolute !important;
  left: -5000px !important;
}

.form-actions {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.form-message {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  display: none;
}

.form-message.success {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
  display: block;
}

.form-message.error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
  display: block;
}

/* ========== Footer ========== */
.site-footer {
  background: var(--dark);
  color: #d1d5db;
  padding: var(--space-3xl) 0 var(--space-md);
  position: relative;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-logo {
  max-width: 180px;
  margin-bottom: var(--space-md);
}

.footer-section p {
  margin-bottom: var(--space-md);
}

.footer-title {
  color: var(--white);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-lg);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: #c9e2ff;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-info {
  list-style: none;
}

.footer-info li {
  margin-bottom: var(--space-sm);
}

.newsletter-note {
  font-size: var(--font-size-sm);
  opacity: 0.7;
}

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

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-links-bottom {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-links-bottom a {
  color: #c9e2ff;
}

.footer-links-bottom span {
  opacity: 0.5;
}

/* ========== Back to Top ========== */
.back-to-top {
  position: fixed;
  right: var(--space-xl);
  bottom: var(--space-xl);
  background: var(--accent);
  color: var(--white);
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  z-index: 99;
}

.back-to-top:hover {
  background: var(--accent-dark);
  transform: translateY(-3px);
}

.back-to-top.visible {
  display: flex;
}

/* ========== Responsive Design ========== */
@media (max-width: 1024px) {
  :root {
    --container-padding: 2rem;
  }
  
  .hero-content {
    max-width: 500px;
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.625rem;
    --font-size-2xl: 1.375rem;
    --container-padding: 1.5rem;
  }
  
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
  
  .contact-info {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-base);
    max-height: calc(100vh - 100%);
    overflow-y: auto;
  }
  
  .nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .nav-link {
    padding: var(--space-md);
    border-bottom: 1px solid var(--light-gray);
  }
  
  .nav-dropdown .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: var(--light);
    border-radius: 0;
  }
  
  .nav-phone {
    margin-left: 0;
    border-top: 2px solid var(--light-gray);
  }
  
  .hero-slider {
    height: 400px;
  }
  
  .hero-content {
    height: 400px;
    text-align: center;
    max-width: none;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-controls {
    display: none;
  }
  
  .features-grid,
  .services-grid,
  .courses-grid,
  .testimonials-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
  }
  
  .hero-slider {
    height: 350px;
  }
  
  .hero-content {
    height: 350px;
  }
  
  .hero-content h1 {
    font-size: var(--font-size-3xl);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 250px;
  }
  
  .top-bar-content {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }
  
  .contact-item {
    flex-direction: column;
    text-align: center;
  }
  
  .back-to-top {
    right: var(--space-md);
    bottom: var(--space-md);
  }
}

/* ========== Print Styles ========== */
@media print {
  .top-bar,
  .main-nav,
  .hero-controls,
  .hero-indicators,
  .back-to-top,
  .social-links {
    display: none !important;
  }
  
  .site-header {
    position: static;
  }
  
  .hero {
    height: auto;
  }
  
  .hero-slider {
    height: auto;
  }
  
  .hero-slide {
    position: static;
    opacity: 1;
  }
  
  .hero-bg,
  .hero-overlay {
    display: none;
  }
  
  .hero-content {
    color: var(--black);
    height: auto;
    padding: var(--space-xl) 0;
  }
  
  .section {
    padding: var(--space-xl) 0;
    break-inside: avoid;
  }
  
  .btn {
    display: none;
  }
  
  a::after {
    content: " (" attr(href) ")";
    font-size: var(--font-size-sm);
  }
}

/* ========== JavaScript Component Styles ========== */

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Mobile menu active state */
.nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Dropdown active state */
.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Tab styles for university pages */
.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.nav-tabs .active a {
    color: var(--primary);
    border-bottom-color: var(--accent);
}

/* Alert styles for form messages */
.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert .close {
    float: right;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.7;
}

.alert .close:hover {
    opacity: 1;
}

/* Image error state */
.image-error {
    opacity: 0.5;
}