/* ========================================
   ANVESHAN - Physics Learning Initiative
   Design System & Styles (Mobile-First Responsive)
   ======================================== */

/* Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ========================================
   CSS Variables / Design Tokens
   ======================================== */
:root {
  /* Colors */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-accent: #C8A27C;
  --color-accent-dark: #a67c52;
  --color-accent-light: #e8d5c4;
  --color-physics-blue: #3A6EA5;
  --color-physics-blue-light: #5a8ec5;
  --color-physics-blue-lighter: #e8f0f8;
  --color-gray-light: #f8f8f8;
  --color-gray-lighter: #fcfcfc;
  --color-gray-text: #4a4a4a;
  --color-gray-border: #f0f0f0;
  
  /* Typography */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing - Mobile-first approach */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Shadows */
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
  --shadow-accent: 0 4px 20px rgba(58, 110, 165, 0.15);
  
  /* Transitions */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s ease-in-out;
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Global Styles (Mobile-First)
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 14px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-white);
  color: var(--color-black);
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

/* Subtle physics-themed background pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(58, 110, 165, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(200, 162, 124, 0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

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

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

/* Physics-inspired decorative elements */
.physics-accent {
  color: var(--color-physics-blue);
}

/* ========================================
   Typography (Mobile-First)
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-physics-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  position: relative;
  display: inline-block;
}

/* Section divider under h2 */
h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-physics-blue) 100%);
  border-radius: 2px;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-gray-text);
  line-height: 1.8;
}

/* ========================================
   Navigation Bar (Mobile-First)
   ======================================== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(240, 240, 240, 0.5);
  z-index: 1000;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-smooth);
}

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

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-physics-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.nav-logo:hover {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: var(--spacing-sm);
  list-style: none;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--color-black);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition-fast);
  position: relative;
  padding: var(--spacing-xs) var(--spacing-sm);
  display: inline-block;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-links a::before {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-physics-blue) 100%);
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover::before {
  width: 100%;
}

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

/* ========================================
   Main Content Area (Mobile-First)
   ======================================== */
main {
  margin-top: 70px;
  padding: 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  width: 100%;
}

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

.section-light {
  background: linear-gradient(180deg, var(--color-gray-light) 0%, var(--color-gray-lighter) 100%);
}

/* ========================================
   Hero Section (Mobile-First)
   ======================================== */
.hero {
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-lighter) 100%);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='rgba(58,110,165,0.04)' stroke-width='1'%3E%3Cline x1='0' y1='0' x2='60' y2='60'/%3E%3Cline x1='60' y1='0' x2='0' y2='60'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
  pointer-events: none;
}

.hero-content {
  max-width: 100%;
  position: relative;
  z-index: 2;
  animation: fadeInUp 0.8s ease-out;
  padding: 0 var(--spacing-sm);
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.05em;
  animation: fadeInDown 0.8s ease-out;
}

.hero .subtitle {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  background: linear-gradient(135deg, var(--color-physics-blue) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero .description {
  font-size: 1rem;
  color: var(--color-gray-text);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 1s ease-out 0.4s both;
}

/* Drift animation for background */
@keyframes drift {
  0% { transform: translateX(0px); }
  100% { transform: translateX(100px); }
}

/* ========================================
   Buttons (Mobile-First - Better Touch Targets)
   ======================================== */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
  text-align: center;
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: white;
  box-shadow: var(--shadow-medium);
  position: relative;
  z-index: 1;
}

.btn-primary:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  background: linear-gradient(135deg, var(--color-accent-dark) 0%, var(--color-accent) 100%);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-dark);
  color: var(--color-accent-dark);
}

.btn-social {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-soft);
}

.btn-social:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.btn-social-blue {
  background: linear-gradient(135deg, var(--color-physics-blue) 0%, var(--color-physics-blue-light) 100%);
}

.btn-social-blue:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  transform: translateY(-3px);
}

/* ========================================
   Cards (Mobile-First)
   ======================================== */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 12px;
  padding: var(--spacing-md);
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-physics-blue) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
  border-color: var(--color-accent-light);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  color: var(--color-black);
  margin-bottom: var(--spacing-md);
}

.card p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Icon styling in cards */
.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

/* ========================================
   Cards Grid (Mobile-First - 1 Column)
   ======================================== */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

/* ========================================
   Section: About the Initiative (Mobile-First)
   ======================================== */
.section-about {
  padding: var(--spacing-lg) var(--spacing-md);
  position: relative;
}

.section-about::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-gray-border) 50%, transparent 100%);
}

.about-content {
  max-width: 100%;
  margin: 0 auto;
  line-height: 1.9;
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.9;
}

.about-content p {
  margin-bottom: var(--spacing-lg);
}

.about-content p:first-letter {
  color: var(--color-physics-blue);
  font-weight: 600;
}

/* ========================================
   Section: Why This Program (Mobile-First)
   ======================================== */
.section-why {
  background: linear-gradient(180deg, var(--color-gray-lighter) 0%, var(--color-gray-light) 100%);
  padding: var(--spacing-lg) var(--spacing-md);
  position: relative;
}

.section-why::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='rgba(58, 110, 165, 0.03)' stroke-width='1'%3E%3Cline x1='0' y1='0' x2='60' y2='60'/%3E%3Cline x1='60' y1='0' x2='0' y2='60'/%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

/* ========================================
   Why Grid (Mobile-First - 1 Column)
   ======================================== */
.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  position: relative;
  z-index: 1;
}

.why-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.why-card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.why-card h4 {
  margin-bottom: var(--spacing-md);
  color: var(--color-black);
  position: relative;
  display: inline-block;
}

.why-card h4::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 50%, var(--color-physics-blue) 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.why-card:hover h4::after {
  transform: scaleX(1);
}

.why-card p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========================================
   Section: Teacher Profile (Mobile-First)
   ======================================== */
.section-teacher {
  padding: var(--spacing-lg) var(--spacing-md);
  position: relative;
}

.section-teacher::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-gray-border) 50%, transparent 100%);
}

.teacher-container {
  max-width: 100%;
  margin: 0 auto;
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-lighter) 100%);
  padding: var(--spacing-lg);
  border-radius: 16px;
  border: 1px solid var(--color-gray-border);
  box-shadow: var(--shadow-medium);
  text-align: center;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.teacher-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-physics-blue) 100%);
}

.teacher-container:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.teacher-image {
  width: 150px;
  height: 150px;
  border-radius: 12px;
  object-fit: cover;
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-medium);
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-physics-blue-lighter) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--color-accent);
  border: 2px solid var(--color-gray-border);
  margin-left: auto;
  margin-right: auto;
  transition: var(--transition-smooth);
}

.teacher-container:hover .teacher-image {
  transform: scale(1.05);
}

.teacher-name {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-physics-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.teacher-title {
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.teacher-bio {
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
  color: var(--color-gray-text);
}

.teacher-socials {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

/* ========================================
   Gallery Grid (Mobile-First - 1 Column)
   ======================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.gallery-item {
  background-color: var(--color-white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-smooth);
  cursor: pointer;
  border: 1px solid var(--color-gray-border);
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.gallery-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-physics-blue) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2;
}

.gallery-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-12px);
  border-color: var(--color-accent-light);
}

.gallery-item:hover::before {
  opacity: 1;
}

.gallery-item-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-physics-blue-lighter) 100%);
  color: var(--color-accent);
  position: relative;
  overflow: hidden;
}

/* ensure images fill the gallery item correctly */
.gallery-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery-item-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 30% 70%, rgba(58, 110, 165, 0.1), transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-item-image::after {
  opacity: 1;
}

.gallery-item-content {
  padding: var(--spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.gallery-item-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-black);
}

.gallery-item-description {
  font-size: 0.9rem;
  color: var(--color-gray-text);
  line-height: 1.6;
  flex-grow: 1;
}

/* ========================================
   Footer (Mobile-First)
   ======================================== */
footer {
  background: linear-gradient(180deg, var(--color-gray-light) 0%, var(--color-white) 100%);
  border-top: 1px solid var(--color-gray-border);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  margin-top: var(--spacing-lg);
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(58, 110, 165, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(200, 162, 124, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

.footer-content {
  max-width: 100%;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.footer-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-black) 0%, var(--color-physics-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-subtitle {
  color: var(--color-gray-text);
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
}

.footer-teacher {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md) 0;
  border-top: 1px solid var(--color-gray-border);
  border-bottom: 1px solid var(--color-gray-border);
}

.footer-teacher-label {
  color: var(--color-gray-text);
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
}

.footer-teacher-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-black);
}

.footer-description {
  display: none;
  color: var(--color-gray-text);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.footer-professional {
  display: none;
  color: var(--color-gray-text);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
  font-style: italic;
  font-size: 0.95rem;
}

.footer-socials {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-top: var(--spacing-md);
  border-top: 1px solid var(--color-gray-border);
  padding-top: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-copyright {
  margin-top: var(--spacing-md);
  font-size: 0.8rem;
  color: var(--color-gray-text);
}

/* ========================================
   Animations
   ======================================== */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes drift {
  0% { transform: translateX(0px); }
  100% { transform: translateX(100px); }
}

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

@keyframes fadeInDown {
  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(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

/* ========================================
   Responsive Design (Mobile-First Breakpoints)
   ======================================== */

/* ===== SMALL MOBILE: 480px and above ===== */
@media (min-width: 480px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.9rem;
  }

  h3 {
    font-size: 1.6rem;
  }

  .hero {
    min-height: 75vh;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero .subtitle {
    font-size: 1.4rem;
  }

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

  .nav-logo {
    font-size: 1.35rem;
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .nav-links a {
    font-size: 0.95rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
  }

  .gallery-item-image {
    height: 200px;
  }

  .cards-grid,
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .teacher-image {
    width: 180px;
    height: 180px;
  }

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

/* ===== TABLET: 768px and above ===== */
@media (min-width: 768px) {
  html {
    font-size: 16px;
  }

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.2rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
  }

  h3 {
    font-size: 1.75rem;
  }

  h4 {
    font-size: 1.2rem;
  }

  .hero {
    min-height: 80vh;
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .hero h1 {
    font-size: 3rem;
  }

  .hero .subtitle {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
  }

  .hero .description {
    font-size: 1.05rem;
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
  }

  .hero-content {
    max-width: 900px;
  }

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

  .nav-logo {
    font-size: 1.5rem;
  }

  .nav-links {
    gap: var(--spacing-lg);
  }

  .nav-links a {
    font-size: 1rem;
  }

  main {
    margin-top: 80px;
  }

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

  .section {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .section-about {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .about-content {
    max-width: 800px;
  }

  .section-why {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
  }

  .why-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .gallery-item-image {
    height: 250px;
  }

  .gallery-item-title {
    font-size: 1.1rem;
  }

  .gallery-item-content {
    padding: var(--spacing-lg);
  }

  .section-teacher {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .teacher-container {
    max-width: 600px;
    padding: var(--spacing-2xl);
  }

  .teacher-image {
    width: 200px;
    height: 200px;
    margin-bottom: var(--spacing-lg);
  }

  .teacher-name {
    font-size: 2rem;
  }

  .teacher-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
  }

  .teacher-bio {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
  }

  .teacher-socials {
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
  }

  footer {
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin-top: var(--spacing-2xl);
  }

  .footer-content {
    max-width: 600px;
  }

  .footer-title {
    font-size: 1.5rem;
  }

  .footer-subtitle {
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
  }

  .footer-teacher {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg) 0;
  }

  .footer-description {
    display: block;
  }

  .footer-professional {
    display: block;
    margin-bottom: var(--spacing-lg);
  }

  .footer-socials {
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
  }

  .footer-copyright {
    margin-top: var(--spacing-lg);
    font-size: 0.85rem;
  }
}

/* ===== MEDIUM DESKTOP: 1024px and above ===== */
@media (min-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .why-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .gallery-item-image {
    height: 280px;
  }
}

/* ===== LARGE DESKTOP: 1200px and above ===== */
@media (min-width: 1200px) {
  .container {
    max-width: 1200px;
  }
}

/* ===== VERY SMALL SCREENS: Below 380px ===== */
@media (max-width: 379px) {
  html {
    font-size: 13px;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero {
    min-height: 60vh;
    padding: var(--spacing-md) var(--spacing-sm);
  }

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

  .hero .subtitle {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
  }

  .nav-container {
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .nav-logo {
    font-size: 1rem;
  }

  .nav-links {
    gap: var(--spacing-xs);
  }

  .nav-links a {
    font-size: 0.8rem;
    padding: var(--spacing-xs);
  }

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

  .gallery-grid {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .gallery-item-image {
    height: 180px;
  }

  .teacher-image {
    width: 120px;
    height: 120px;
  }
}

/* ========================================
   Accessibility & Print
   ======================================== */
@media print {
  nav, footer {
    display: none;
  }
}

/* Smooth transitions for prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}