/* ==========================================
   VARPHI CLUB - COMPLETE STYLES.CSS
   ========================================== */

/* Root Variables */
:root {
  --october-pink: #ff1493;
  --hackphinight:#6C63FF;
  --primary-color: #00a3ff;
  --primary-dark: #0066cc;
  --secondary-color: #8b5cf6;
  --bg-dark: #0f1419;
  --bg-card: #1a1f2e;
  --bg-card-hover: #252b3b;
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body:not(.dark-mode) {
  --bg-dark: #f7fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f7fafc;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --border-color: rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ==========================================
   NAVIGATION
   ========================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(15, 20, 25, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

body:not(.dark-mode) .navbar {
  background-color: rgba(247, 250, 252, 0.8);
}

.navbar.scrolled {
  background-color: rgba(15, 20, 25, 0.95);
  box-shadow: var(--shadow-md);
}

body:not(.dark-mode) .navbar.scrolled {
  background-color: rgba(247, 250, 252, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

@media (max-width: 768px) {
  .nav-container {
    padding: 12px 16px;
  }
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 1001;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

@media (max-width: 480px) {
  .logo-text {
    font-size: 18px;
  }

  .logo svg {
    width: 32px;
    height: 32px;
  }
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 1001;
}

.theme-toggle:hover {
  background-color: var(--bg-card);
  border-color: var(--primary-color);
}

.dark-mode .sun-icon {
  display: none;
}

.dark-mode .moon-icon {
  display: block;
}

body:not(.dark-mode) .sun-icon {
  display: block;
}

body:not(.dark-mode) .moon-icon {
  display: none;
}

.pink-october-cta {
  background: linear-gradient(135deg, #ff1493, #e91e63);
  color: white;
  padding: 12px 20px;
  border-radius: 24px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(233, 30, 99, 0.4);
  text-decoration: none;
  white-space: nowrap;
}

.pink-october-cta:hover {
  background: linear-gradient(135deg, #e91e63, #c2185b);
  box-shadow: 0 8px 24px rgba(233, 30, 99, 0.6);
  transform: translateY(-2px);
}

.pink-october-cta:active {
  transform: translateY(0);
}

.pink-october-cta img {
  width: 20px;
  height: 20px;
  filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.6));
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.6;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 120px 24px 80px;
  max-width: 1200px;
  margin: 0 auto;
  gap: 60px;
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-title {
  font-size: clamp(48px, 8vw, 72px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 24px);
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  flex: 1;
  min-width: 120px;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: 16px 32px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0, 163, 255, 0.3);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 163, 255, 0.4);
}

.hero-image {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.math-illustration {
  max-width: 100%;
  height: auto;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.features {
  padding: 80px 24px;
  background: linear-gradient(180deg, transparent, rgba(0, 163, 255, 0.05));
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  color: var(--text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.feature-icon {
  margin-bottom: 20px;
}

.feature-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 15px;
}

.events-preview {
  padding: 80px 24px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 16px;
}

.view-all-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}

.view-all-link:hover {
  color: var(--primary-dark);
}

.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.event-card-preview {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  gap: 20px;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.event-card-preview:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.event-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  border-radius: var(--radius-md);
  padding: 16px;
  min-width: 80px;
  color: white;
  flex-shrink: 0;
}

.date-day {
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
}

.date-month {
  font-size: 14px;
  font-weight: 500;
}

.event-info {
  flex: 1;
}

.event-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.event-description {
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-size: 14px;
  line-height: 1.5;
}

.event-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.footer {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 100%);
  border-top: 2px solid var(--primary-color);
  padding: 80px 24px 0;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0%,
  100% {
    opacity: 0.3;
  }
  50% {
    opacity: 1;
  }
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand {
  padding-right: 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo svg {
  width: 48px;
  height: 48px;
}

.footer-logo-text {
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-tagline {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-size: 15px;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.social-link {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.social-link:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: translateY(-4px);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

.footer-section-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  position: relative;
  padding-bottom: 12px;
}

.footer-section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), transparent);
  border-radius: 2px;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 14px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
}

.footer-links a::before {
  content: "→";
  opacity: 0;
  transform: translateX(-10px);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-color);
  padding-left: 8px;
}

.footer-links a:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(0, 163, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary-color);
}

.contact-icon svg {
  width: 18px;
  height: 18px;
}

.contact-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.contact-item a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 32px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 14px;
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-bottom-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-bottom-links a:hover {
  color: var(--primary-color);
}

.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 16px rgba(0, 163, 255, 0.4);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 163, 255, 0.6);
}

[data-aos] {
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
  opacity: 1;
}

[data-aos="fade-up"] {
  transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
  transform: translateY(0);
}

[data-aos="fade-left"] {
  transform: translateX(-30px);
}

[data-aos="fade-left"].aos-animate {
  transform: translateX(0);
}

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

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    right: -100%;
    width: 100%;
    max-width: 300px;
    height: calc(100vh - 72px);
    background-color: var(--bg-card);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    transition: right 0.3s ease;
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
  }

  .nav-menu.active {
    right: 0;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero {
    flex-direction: column-reverse;
    padding-top: 100px;
    text-align: center;
    gap: 40px;
    min-height: auto;
    padding-bottom: 60px;
  }

  .hero-content {
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    justify-content: center;
    width: 100%;
  }

  .hero-image {
    max-width: 300px;
  }

  .section-header {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .features {
    padding: 60px 16px;
  }

  .section-title {
    margin-bottom: 40px;
  }

  .features-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
  }

  .feature-card {
    padding: 24px;
  }

  .feature-card:hover {
    transform: translateY(-4px);
  }

  .events-preview {
    padding: 60px 16px;
  }

  .events-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .event-card-preview {
    flex-direction: column;
    padding: 20px;
  }

  .event-date {
    flex-direction: row;
    width: 100%;
    min-width: unset;
    gap: 8px;
    padding: 12px;
  }

  .footer {
    padding: 60px 16px 0;
    margin-top: 60px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-brand {
    grid-column: unset;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    padding: 24px 0;
  }

  .footer-social {
    justify-content: center;
  }

  .footer-section-title {
    text-align: center;
  }

  .footer-section-title::after {
    left: 50%;
    transform: translateX(-50%);
  }

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

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}

@media (max-width: 480px) {
  .stat-number {
    font-size: 24px;
  }

  .stat-label {
    font-size: 12px;
  }

  .cta-button {
    padding: 14px 24px;
    font-size: 16px;
    width: 100%;
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-title {
    font-size: 20px;
  }

  .feature-description {
    font-size: 14px;
  }

  .event-title {
    font-size: 18px;
  }

  .date-day {
    font-size: 24px;
  }

  .hero-stats {
    flex-direction: column;
    width: 100%;
  }

  .stat-card {
    width: 100%;
  }

  .hero {
    padding-top: 80px;
    padding-bottom: 40px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .hero {
    gap: 40px;
    padding: 100px 24px 60px;
  }

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

  .hero-image svg {
    max-width: 350px;
  }

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}