/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  /* Colors - slightly refined palette */
  --color-bg: #1a1f1a;
  --color-bg-elevated: #232923;
  --color-text-main: #e8ede9;
  --color-text-muted: #9ca89f;
  --color-text-header: #ffffff;
  --color-primary: #cdfd55;
  --color-primary-dark: #b3e344;
  --color-border: rgba(205, 253, 85, 0.15);
  --color-border-hover: rgba(205, 253, 85, 0.3);
  
  /* Layout */
  --wrapper-height: 85vh;
  --image-max-width: 320px;
  --content-max-width: 1200px;
  
  /* Typography */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-family-header: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  
  /* Spacing - More compact */
  --spacing-xs: 0.2rem;
  --spacing-sm: 0.4rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;
  --spacing-3xl: 2.5rem;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-button: 8px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  font-size: 16px;
  font-weight: 400;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-header);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-lg);
}

#main-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  background: linear-gradient(
    135deg, 
    rgba(255, 255, 255, 0.95) 0%,
    rgba(255, 255, 255, 0.85) 20%,
    rgba(205, 253, 85, 0.9) 40%,
    var(--color-primary) 60%,
    rgba(205, 253, 85, 0.8) 80%,
    rgba(255, 255, 255, 0.7) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
  position: relative;
}

h2 {
  font-size: clamp(1.5rem, 2.5vw, 1.875rem);
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: var(--spacing-xs);
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 600;
  margin-top: var(--spacing-xl);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
  color: var(--color-text-main);
  font-size: 0.95rem;
  text-align: justify;
}

strong {
  font-weight: 600;
  color: var(--color-text-header);
}

em {
  font-style: italic;
  opacity: 0.9;
}

/* ============================================
   Header
   ============================================ */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-2xl);
  background: rgba(26, 31, 26, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all var(--transition-base);
}

#logo-div {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: transform var(--transition-base);
}

#logo-div:hover {
  transform: translateX(4px);
}

#logo-img {
  height: 48px;
  width: auto;
  border-radius: var(--radius-md);
  transition: transform var(--transition-base);
}

#logo-div:hover #logo-img {
  transform: rotate(-5deg) scale(1.05);
}

#logo-div > p {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  margin: 0;
}

/* ============================================
   Navigation & Links
   ============================================ */
.nav-item {
  text-decoration: none;
  transition: all var(--transition-fast);
}

#join-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-xl);
  background: rgba(205, 253, 85, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-bg);
  border: 1px solid rgba(205, 253, 85, 0.3);
  border-radius: var(--radius-button);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  font-family: var(--font-family);
  box-shadow: 0 2px 8px rgba(205, 253, 85, 0.15);
}

#join-button svg {
  transition: transform var(--transition-fast);
}

#join-button:hover {
  background: rgba(205, 253, 85, 0.95);
  color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: 
    0 4px 16px rgba(205, 253, 85, 0.25),
    0 0 0 4px rgba(205, 253, 85, 0.15);
  border-color: var(--color-primary);
}

#join-button:hover svg {
  transform: scale(1.1);
}

/* CTA Button - same styling as join button */
#cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-2xl);
  background: rgba(205, 253, 85, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-bg);
  border: 1px solid rgba(205, 253, 85, 0.3);
  border-radius: var(--radius-button);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  font-family: var(--font-family);
  box-shadow: 0 2px 8px rgba(205, 253, 85, 0.15);
}

#cta-button svg {
  transition: transform var(--transition-fast);
}

#cta-button:hover {
  background: rgba(205, 253, 85, 0.95);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

#cta-button:hover svg {
  transform: scale(1.1);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
  display: inline-block;
}

a:not(.nav-item):hover {
  color: var(--color-primary-dark);
}

/* Fancy underline effect for text links */
p a::after, 
li a::after,
footer a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
  border-radius: var(--radius-full);
}

p a:hover::after,
li a:hover::after,
footer a:hover::after {
  width: 100%;
}

/* ============================================
   Main Content
   ============================================ */
main {
  flex: 1;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-2xl);
  max-width: var(--content-max-width);
  width: 100%;
}

#inner {
  max-width: 800px;
  margin: 0 auto;
}

.content {
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Lists
   ============================================ */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
  font-size: 0.95rem;
}

/* Style list bullets */
ul li {
  position: relative;
  list-style: none;
  padding-left: var(--spacing-lg);
}

ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
  transform: scale(1.2);
}

/* ============================================
   Cards & Containers
   ============================================ */
.card {
  background: rgba(35, 41, 35, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(205, 253, 85, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-base);
  box-shadow: 0 4px 24px 0 rgba(0, 0, 0, 0.2);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    0 0 40px rgba(205, 253, 85, 0.08);
  border-color: rgba(205, 253, 85, 0.2);
  background: rgba(35, 41, 35, 0.4);
}

/* ============================================
   Code & Pre
   ============================================ */
code {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--color-primary);
}

pre {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
}

/* ============================================
   Footer
   ============================================ */
footer {
  background: var(--color-bg-elevated);
  padding: var(--spacing-lg) var(--spacing-2xl);
  text-align: center;
  margin-top: auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.footer-link:hover {
  color: var(--color-primary);
}

.footer-link svg {
  transition: transform var(--transition-fast);
}

.footer-link:hover svg {
  transform: scale(1.1);
}

.footer-link::after {
  display: none;
}

.separator {
  color: var(--color-border);
  font-size: 0.8rem;
  user-select: none;
}

.footer-copyright {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  opacity: 0.7;
  text-align: center;
  width: 100%;
  display: block;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

footer a {
  font-weight: 500;
}

/* ============================================
   Buttons & Interactive Elements
   ============================================ */
.button, button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background: rgba(205, 253, 85, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-bg);
  border: 1px solid rgba(205, 253, 85, 0.3);
  border-radius: var(--radius-button);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  font-family: var(--font-family);
  box-shadow: 0 2px 8px rgba(205, 253, 85, 0.15);
}

.button svg, button svg {
  transition: transform var(--transition-fast);
}

.button:hover svg, button:hover svg {
  transform: scale(1.1);
}

.button:hover, button:hover {
  background: rgba(205, 253, 85, 1);
  color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: 
    0 4px 16px rgba(205, 253, 85, 0.3),
    0 0 20px rgba(205, 253, 85, 0.1);
  border-color: var(--color-primary);
}

.button-outline {
  background: rgba(205, 253, 85, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-primary);
  border: 1px solid rgba(205, 253, 85, 0.3);
  box-shadow: none;
}

.button-outline:hover {
  background: rgba(205, 253, 85, 0.15);
  color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: 
    0 2px 12px rgba(205, 253, 85, 0.2),
    0 0 20px rgba(205, 253, 85, 0.1);
}

/* ============================================
   Forms (for join page)
   ============================================ */
input, textarea, select {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-main);
  font-family: var(--font-family);
  font-size: 1rem;
  transition: all var(--transition-base);
  margin-bottom: var(--spacing-md);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(205, 253, 85, 0.1);
}

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

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

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

.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); }

.highlight {
  background: linear-gradient(120deg, transparent 0%, rgba(205, 253, 85, 0.2) 10%, rgba(205, 253, 85, 0.2) 90%, transparent 100%);
  padding: 0 var(--spacing-xs);
  border-radius: var(--radius-sm);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  header {
    padding: var(--spacing-sm) var(--spacing-lg);
    justify-content: space-between;
    align-items: center;
  }
  
  #logo-div {
    transform: scale(0.85);
  }
  
  #logo-img {
    height: 36px;
  }
  
  #logo-div > p {
    display: none;
  }
  
  #join-button {
    padding: 6px 16px;
    font-size: 0.85rem;
    gap: 6px;
  }
  
  #join-button svg {
    width: 14px;
    height: 14px;
  }
  
  main {
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-xl);
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  #main-title {
    font-size: 2.25rem;
    margin-bottom: var(--spacing-md);
  }
  
  h2 {
    font-size: 1.375rem;
    margin-top: var(--spacing-lg);
  }
  
  .cta-card {
    padding: var(--spacing-lg);
  }
  
  .hero-tagline {
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }
  
  header {
    padding: var(--spacing-xs) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  #logo-div {
    transform: scale(0.75);
    margin-left: -10px;
  }
  
  #logo-img {
    height: 32px;
  }
  
  #join-button {
    padding: 5px 10px;
    font-size: 0.75rem;
    white-space: nowrap;
    gap: 4px;
  }
  
  #join-button svg {
    width: 12px;
    height: 12px;
  }
  
  main {
    padding: var(--spacing-md) var(--spacing-sm) var(--spacing-lg);
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  #main-title {
    font-size: 1.875rem;
    margin-bottom: var(--spacing-sm);
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  p {
    font-size: 0.875rem;
  }
  
  .hero-tagline {
    font-size: 0.8rem;
    margin-top: -0.25rem;
  }
  
  .cta-card {
    padding: var(--spacing-md);
  }
  
  .cta-card h3 {
    font-size: 1.25rem;
  }
}

/* ============================================
   Animations
   ============================================ */
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(205, 253, 85, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(205, 253, 85, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(205, 253, 85, 0);
  }
}

.pulse {
  animation: pulse 2s infinite;
}

/* ============================================
   Special Effects
   ============================================ */
.glow {
  text-shadow: 0 0 20px rgba(205, 253, 85, 0.5);
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-text-header) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
  text-align: left;
  margin-bottom: var(--spacing-xl);
}

.hero-tagline {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--spacing-sm);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-top: -0.5rem;
  color: var(--color-text-muted);
}

.icon-tennis {
  display: inline-block;
  font-size: 1rem;
  animation: bounce 3s ease-in-out infinite;
  opacity: 0.8;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-2px) rotate(-3deg);
  }
  50% {
    transform: translateY(0) rotate(0deg);
  }
  75% {
    transform: translateY(-2px) rotate(3deg);
  }
}

.content-wrapper {
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  margin-top: var(--spacing-xl);
}

.cta-card {
  background: rgba(35, 41, 35, 0.25);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl) var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

.cta-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.05) 0%, 
    transparent 50%,
    rgba(205, 253, 85, 0.02) 100%);
  pointer-events: none;
}

.cta-card:hover {
  transform: translateY(-2px);
  border-color: rgba(205, 253, 85, 0.2);
  box-shadow: 
    0 12px 40px 0 rgba(0, 0, 0, 0.35),
    0 0 60px rgba(205, 253, 85, 0.08);
  background: rgba(35, 41, 35, 0.3);
}

.cta-card h3 {
  margin-top: 0;
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.cta-card p {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.cta-card .button {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: 1.05rem;
}